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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549





FORM 10-K

(Mark one)

|x | ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
|- | ------------------------------------------------------------------------------------

For the fiscal year ended December 31, 2010

OR



| ̈ | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
|- | ----------------------------------------------------------------------------------------

Commission File Number 000-30347





CURIS, INC.

(Exact Name of Registrant as Specified in Its Charter)



|                                                               |  |                                     
|-------------------------------------------------------------- |  | ------------------------------------
|DELAWARE                                                       |  | 04-3505116                          
|(State or other jurisdiction of
incorporation or organization) |  | (I.R.S. Employer Identification No.)

4 Maguire Road

Lexington, Massachusetts 02421

(Address of principal executive offices) (Zip Code)

617-503-6500

(Registrants telephone number, including area code)





Securities registered pursuant to Section 12(b) of the Act:



|                                        |  |                                          
|--------------------------------------- |  | -----------------------------------------
|Title of Each Class                     |  | Name of Each Exchange on Which Registered
|Common Stock, $0.01 par value per share |  | The NASDAQ Stock Market                  

Securities registered pursuant to Section 12(g) of the Act:

None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities
Act.    Yes   ̈    No  x

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the
Act.    Yes   ̈    No  x

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the
Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90
days.    x  Yes     ̈  No

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate website, if any, every Interactive
Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such
files).     ̈  Yes     ̈  No

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will
not be contained, to the best of registrants knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.     ̈

Indicate by check mark whether the registrant is a large accelerated filer, an
accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of large accelerated filer, accelerated filer and smaller reporting company in Rule 12b-2 of the Exchange Act.



|                                              |  |                               
|--------------------------------------------- |  | ------------------------------
|Large accelerated filer     ̈                  |  | Accelerated filer    x        
|                                              | 
|Non-accelerated filer     ̈                    |  | Smaller reporting company     ̈
|(Do not check if a smaller reporting company) |  |                               

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the
Act).    Yes   ̈    No  x

The aggregate market value of the registrants common stock held by non-affiliates of the registrant (without admitting that any
person whose shares are not included in such calculation is an affiliate) based on the last reported sale price of the common stock on June 30, 2010 was approximately $80,070,000.

As of March 3, 2011, there were 75,766,161 shares of the registrants common stock outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

Specified portions of the registrants proxy statement for the annual meeting of stockholders scheduled to be held on June 1, 2011, which are to be filed with the Commission not later than 120
days after the close of the Registrants fiscal year ended December 31, 2010 pursuant to Regulation 14A, have been incorporated by reference in Item 5 of Part II and Items 10-14 of Part III of this Annual Report on Form 10-K.









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CURIS, INC.

TABLE OF CONTENTS

Form 10-K



|           |  |                                                                                                               |     |  |     | 
|---------- |  | ------------------------------------------------------------------------------------------------------------- | --- |  | --- | 
|           |  | PART I                                                                                                        |     |  |     | 
|ITEM 1.    |  | BUSINESS                                                                                                      |     |  | 1   | 
|           |  |                                                                                                              
|ITEM 1A.   |  | RISK FACTORS                                                                                                  |     |  | 20  | 
|           |  |                                                                                                              
|ITEM 1B.   |  | UNRESOLVED STAFF COMMENTS                                                                                     |     |  | 40  | 
|           |  |                                                                                                              
|ITEM 2.    |  | PROPERTIES                                                                                                    |     |  | 40  | 
|           |  |                                                                                                              
|ITEM 3.    |  | LEGAL PROCEEDINGS                                                                                             |     |  | 40  | 
|           |  |                                                                                                              
|ITEM 4.    |  | REMOVED AND RESERVED                                                                                          |     |  | 40  | 
|           |  |                                                                                                              
|           |  | PART II                                                                                                       |     |  |     | 
|           |  |                                                                                                              
|ITEM 5.    |  | MARKET FOR REGISTRANTS COMMON EQUITY, RELATED STOCKHOLDERS MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES |     |  | 43  | 
|           |  |                                                                                                              
|ITEM 6.    |  | SELECTED FINANCIAL DATA                                                                                       |     |  | 45  | 
|           |  |                                                                                                              
|ITEM 7.    |  | MANAGEMENTS DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS                         |     |  | 46  | 
|           |  |                                                                                                              
|ITEM 7A.   |  | QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK                                                    |     |  | 67  | 
|           |  |                                                                                                              
|ITEM 8.    |  | FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA                                                                   |     |  | 68  | 
|           |  |                                                                                                              
|ITEM 9.    |  | CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE                          |     |  | 98  | 
|           |  |                                                                                                              
|ITEM 9A.   |  | CONTROLS AND PROCEDURES                                                                                       |     |  | 98  | 
|           |  |                                                                                                              
|ITEM 9B.   |  | OTHER INFORMATION                                                                                             |     |  | 98  | 
|           |  |                                                                                                              
|           |  | PART III                                                                                                      |     |  |     | 
|           |  |                                                                                                              
|ITEM 10.   |  | DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE                                                        |     |  | 99  | 
|           |  |                                                                                                              
|ITEM 11.   |  | EXECUTIVE COMPENSATION                                                                                        |     |  | 99  | 
|           |  |                                                                                                              
|ITEM 12.   |  | SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS                |     |  | 99  | 
|           |  |                                                                                                              
|ITEM 13.   |  | CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE                                     |     |  | 99  | 
|           |  |                                                                                                              
|ITEM 14.   |  | PRINCIPAL ACCOUNTANT FEES AND SERVICES                                                                        |     |  | 99  | 
|           |  |                                                                                                              
|           |  | PART IV                                                                                                       |     |  |     | 
|           |  |                                                                                                              
|ITEM 15.   |  | EXHIBITS AND FINANCIAL STATEMENT SCHEDULES                                                                    |     |  | 100 | 
|           | 
|SIGNATURES |  |                                                                                                               | 101 | 



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PART I

This annual report on Form 10-K contains forward-looking statements that involve risks and uncertainties, as well as assumptions that, if they never materialize or prove incorrect, could cause
Curis financial, operating and business results to differ materially from those expressed or implied by such forward-looking statements. All statements other than statements of historical fact are statements that could be deemed
forward-looking statements, including without limitation any expectations of revenue, expenses, earnings or losses from operations, or other financial results; any statements of the plans, strategies and objectives of management for future
operations; any statements concerning product research, development and commercialization plans, timelines and anticipated results; any statements of expectation or belief; and any statements of assumptions underlying any of the foregoing. The
risks, uncertainties and assumptions referred to above include risks that are described in Item 1A-Risk Factors and elsewhere in this annual report and that are otherwise described from time to time in our Securities and Exchange
Commission reports filed after this report.

The forward-looking statements included in this annual report represent
our estimates as of the date of this annual report. We specifically disclaim any obligation to update these forward-looking statements in the future. These forward-looking statements should not be relied upon as representing our estimates or views
as of any date subsequent to the date of this annual report.



|ITEM 1. | BUSINESS
|------- | --------

Overview

We are a drug discovery and development company that is committed to leveraging our innovative signaling pathway drug technologies in
seeking to develop next generation network-targeted cancer therapies. We are building upon our experience in modulating signaling pathways, including the Hedgehog signaling pathway, in our effort to develop network-targeted cancer therapies. We
conduct our research and development programs both internally and through strategic collaborations.

Hedgehog Pathway
Inhibitor Program

GDC-0449 (RG3616).Our most advanced program is our Hedgehog pathway
inhibitor program under collaboration with Genentech, Inc., a member of the Roche Group. The lead drug candidate being developed under this program is GDC-0449, a first-in-class orally-administered small molecule Hedgehog pathway inhibitor.

The Hedgehog signaling pathway plays an important role in regulating proper growth and development in the early stages of
life and becomes less active in adults. However, mutations in the pathway can occur and reactivate Hedgehog signaling that may lead to different types of cancer. Mutations that lead to overactive signaling in the Hedgehog pathway are implicated in
the majority of basal cell carcinoma, or BCC.

Genentech and Roche are currently conducting two clinical trials of GDC-0449 in
BCC patient populations, including a pivotal phase II trial in advanced BCC and a phase II clinical trial of GDC-0449 for patients with operable nodular BCC. Advanced BCC is a severe form of the disease that includes cutaneous BCCs that are
considered inoperable by the treating physician as well as BCCs that have metastasized to other tissues and organs. In February 2009, Genentech initiated the pivotal phase II clinical trial of GDC-0449, in which approximately 100 patients with
locally advanced or metastatic BCC are being evaluated in a single-arm, two-cohort global clinical trial. One cohort includes all patients with histologically-confirmed, measurable metastatic BCC. The second cohort includes histologically-confirmed
locally advanced BCC that is considered inoperable by the treating physician. All patients receive a daily oral dose of GDC-0449. The primary endpoint in the advanced BBC study is to measure the rate of patient response to GDC-0449 therapy. Roche
has stated that it expects top-line results from this study in the first quarter of 2011 and, if study results are favorable, that it anticipates making at least the first regulatory submission for GDC-0449 in 2011. Assuming that submissions are
filed by Roche and accepted by the applicable



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regulatory agency, we will be eligible to receive milestone payments for the U.S. and Europe territories. Genentech initiated the phase II operable BCC clinical trial in October 2010. This trial
is designed to test GDC-0449 as a single-agent therapy in approximately 50 patients with operable nodular BCC in a US-based, open label, two-cohort clinical trial. All patients will receive a 150 mg daily oral dose of GDC-0449 for 12 weeks. The
primary outcome measure for the first cohort is the rate of complete histological clearance of the target nodular BCC lesions at the time of tumor excision (which may occur up to 12 weeks following initiation of treatment) while the primary outcome
measure for the second cohort is the rate of durable complete clearance of target nodular BCC lesions at the time of excision (which may occur up to 36 weeks following initiation of treatment).

In addition to the BCC clinical trials being conducted directly by Genentech and Roche, GDC-0449 is also currently being tested in other
cancers in trials under collaborative agreements between Genentech and either third-party investigators or the U.S. National Cancer Institute, or NCI, including in medulloblastoma, sarcoma and glioblastoma multiforme, as well as in pancreatic, small
cell lung, gastroesophageal junction, gastric, breast, and prostate cancers, among others.

Genentech completed two Phase II
clinical trials of GDC-0449 in 2010, including in advanced ovarian cancer and metastatic colorectal cancer. Neither of these studies met their primary endpoints of demonstrating a clinically meaningful extension of progression-free survival and
Genentech has determined that it will not pursue further development in these two indications.

Network-Targeted Cancer
Programs

Our internal drug development efforts are focused on our network-targeted cancer programs, in which we are
seeking to design single novel small molecule drug candidates that inhibit multiple signaling pathways that are believed to play roles in cancer cell proliferation. We refer to this approach as cancer network disruption and believe that our approach
of targeting multiple nodes in cancer signaling pathway networks may provide a better therapeutic effect than many of the cancer drugs currently marketed or in development since our drug candidates are being designed to disrupt the cancer network
environment in several additional important targets when compared to most other cancer drugs.

CUDC-101.Our lead candidate from these programs is CUDC-101, a first-in-class small
molecule compound designed to simultaneously inhibit histone deacetylase, or HDAC, epidermal growth factor receptor, or EGFR, and human epidermal growth factor receptor 2, or Her2, all of which are validated cancer targets. A significant amount of
our internal resources are focused on the ongoing clinical development of this molecule. To date, we have completed a phase I dose escalation clinical trial of this molecule in 25 patients with advanced, refractory solid tumors and initiated a phase
Ib expansion trial to test CUDC-101 in approximately 50 patients with specific tumor types, including head and neck, non-small cell lung, breast, gastric and liver cancers. We expect to complete enrollment in the phase Ib study in mid-2011 and to
report full data from this study during the second half of 2011. The phase Ib expansion trial is designed as an open-label study in which patients are treated with CUDC-101 at the maximum tolerated dose, which was determined in the phase I dose
escalation study to be 275 milligrams per meter2. The
primary objectives of this study are to compare the safety and tolerability of CUDC-101 in subjects with these specific advanced solid tumors when the drug is administered either on a five days per week schedule (one week on/one week off) or on a
three days per week schedule (three weeks on/one week off).

We also anticipate initiating a phase I clinical trial of
CUDC-101 in advanced head and neck cancer patients whose cancer is human papilloma virus, or HPV, negative during the first half of 2011. The primary objective of this study is to evaluate the safety and tolerability of CUDC-101 when
administered in combination with the current standard-of-care of cisplatin, a chemotherapeutic drug, and radiation. Upon determination of the maximum tolerated dose and assuming the otherwise successful completion of the phase I trial, we
intend to conduct a randomized phase II two-arm trial in which head and neck cancer patients will receive cisplatin and radiation plus or minus CUDC-101. The phase II study would seek to evaluate whether the addition of CUDC-101 can improve the
efficacy and durability of cisplatin and radiation therapy in this patient population.



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We are also working on an oral formulation of CUDC-101, which we believe will make CUDC-101
more competitive in certain cancers such as non-small cell lung cancer where patients are generally on therapy for several months and there are competing commercially-available molecules that are orally administered. Pending the successful
completion of ongoing formulation and preclinical development work, we intend to file the appropriate regulatory documents for use of an oral formulation of CUDC-101 in clinical trials in late 2011.

CUDC-907.    In January 2011, we selected development candidate CUDC-907, an orally bioavailable,
network-targeted small molecule that is designed to inhibit HDAC and phosphatidylinositol-3-kinase, or PI3K. Our scientists are developing CUDC-907 based on published and internally generated data demonstrating that HDAC and PI3K inhibitors have
synergistic interaction against cancer cells. We believe that this synergistic mechanism of cancer signaling network disruption, which demonstrated efficacy and a favorable safety profile in a number of preclinical xenograft models, could translate
into clinical advantages over single agents. Pending the successful completion of ongoing formulation and preclinical development work, we expect to file an investigational new drug application, or IND, with the US Food and Drug Administration, or
FDA, for an oral formulation of CUDC-907 late in 2011.

In addition to our development-stage programs, we continue to progress
additional proprietary preclinical research programs and expect that we will select additional small molecule inhibitors from our preclinical portfolio in the future.

Hsp90 Program

Debio 0932.Our heat
shock protein 90, or Hsp90, program is being developed by Debiopharm, a Swiss pharmaceutical development company, under an August 2009 license agreement between Curis and Debiopharm. The lead molecule under this license collaboration was designated
Debio 0932 by Debiopharm. In April 2010, Debiopharm treated the first patient in a phase I clinical trial to evaluate the safety of Debio 0932 in patients suffering from advanced solid tumors or lymphoma.

Product Development Programs

We are developing drug candidates designed to treat cancer. Our product development initiatives, described in the chart below, are being pursued using our internal resources or through our collaborations
with Genentech and Debiopharm. We believe that our collaborators provide significant additional resources and clinical development expertise to our programs. In addition, under these collaborations our collaborators have agreed to pay us contingent
cash payments, assuming the achievement of development and regulatory objectives, and royalties on future product sales, if any.

The table below summarizes our current research and development programs, including the current development status of each program.



|                                                                 |  |                                   |  |                       |  |                          
|---------------------------------------------------------------- |  | --------------------------------- |  | --------------------- |  | -------------------------
|Product Candidate                                                |  | Primary Disease                   |  | Collaborator/Licensee |  | Status                   
|Hedgehog Pathway Inhibitor                                       |  |                                   |  |                       |  |                          
|-  GDC-0449
-  GDC-0449                                          |  | Advanced BCC
Operable Nodular BCC |  | Genentech
Genentech   |  | Pivotal phase II
Phase II
|                                                                 |  |                                   | 
|Network-targeted cancer programs                                 |  |                                   |  |                       |  |                          
|-  CUDC-101 intravenous formulation (HDAC, EGFR, Her2 inhibitor) |  | Cancer                            |  | Internal development  |  | Phase Ib                 
|-  CUDC-101 oral formulation (HDAC, EGFR, Her2 inhibitor)        |  | Cancer                            |  | Internal development  |  | Development candidate    
|-  CUDC-907 (HDAC, PI3K inhibitor)                               |  | Cancer                            |  | Internal development  |  | Development candidate    
|-  Other network-targeted cancer programs                        |  | Cancer                            |  | Internal development  |  | Preclinical              
|-  Debio 0932 (formerly CUDC-305) (Hsp90 inhibitor)              |  | Cancer                            |  | Debiopharm            |  | Phase I                  

In the chart above, Pivotal
phase II means that Genentech is currently treating human patients in a pivotal phase II clinical trial, the primary objective of which is a therapeutic response in human patients. Genentech and



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Roche have indicated that the outcome of this clinical trial, if positive, may serve as the basis for regulatory submissions in 2011. Phase II means that Genentech is currently
treating human patients in a phase II clinical trial, the primary objective of which is a therapeutic response in the patient population. Phase Ib means that we are currently treating human patients with specific tumor types in an
extension of our phase I dose escalation trial, at the maximum tolerated dose from such trial, the principal purpose of which is to evaluate the safety and tolerability of the compound being tested. Phase I means that Debiopharm is
currently treating human patients in a phase I clinical trial, the principal purpose of which is to evaluate the safety and tolerability of the compound being tested. Development candidate means that from our testing in several
preclinical models of human disease of various compounds from a particular compound class, we have selected a single lead candidate for potential future clinical development and are seeking to complete the relevant safety, toxicology, and other data
required to submit an IND to the FDA, seeking to commence a phase I clinical trial. Preclinical means that we are seeking to obtain evidence of therapeutic efficacy and safety in preclinical models of human disease of one or more
compounds within a particular class of drug candidates.

Since our inception in 2000, substantially all of our revenues have
been derived from collaborations and other agreements with third parties. For the year ended December 31, 2010, Debiopharm and settlement proceeds received from a former collaborator, Micromet, accounted for substantially all of our revenue, as
follows: Debiopharm, $11,333,000, or 71%, and Micromet, $4,000,000, or 25%. For the year ended December 31, 2009, Genentech and Debiopharm accounted for substantially all of our revenue, as follows: Genentech, $6,229,000, or 73%, and
Debiopharm, $2,199,000, or 26%. For the year ended December 31, 2008, Genentech and Stryker Corporation, the assignee of our Bone Morphogenetic Protein assets, accounted for substantially all of our revenue, as follows: Genentech, $6,282,000,
or 75%, and Stryker, $1,750,000, or 21%.

Hedgehog Pathway Inhibitor Program

The Hedgehog pathway is normally active during embryonic development and regulates tissue and organ formation by directly promoting cell
division in specific cell types, and by activating other secondary signaling pathways that control the synthesis of growth factors and angiogenic (blood vessel-forming) factors. Malignant activation of the Hedgehog pathway is believed to play a
central role in allowing the proliferation and survival of cancer cells, including basal cell carcinoma and medulloblastoma as well as colorectal, ovarian, pancreatic, small cell lung and breast cancers, among others.

Our Hedgehog pathway inhibitor technologies represent our most advanced program and are being developed in various cancer indications
under a June 2003 collaboration agreement with Genentech. The lead drug candidate being developed under this program is GDC-0449, a first-in-class orally-administered small molecule Hedgehog pathway inhibitor. Genentech and Roche are responsible for
the clinical development and commercialization of GDC-0449 and are currently conducting two clinical trials of GDC-0449, including a pivotal phase II trial in advanced BCC that was initiated in February 2009 and a phase II trial in operable BCC that
was initiated in October 2010. In addition, GDC-0449 is also currently being tested in other cancers in trials under collaborative agreements between Genentech and either third-party investigators or the U.S. National Cancer Institute, or NCI,
including in medulloblastoma, sarcoma and glioblastoma multiforme, as well as in pancreatic, small cell lung, gastroesophageal junction, gastric, breast, and prostate cancers, among others. Genentech completed two Phase II clinical trials of
GDC-0449 in 2010, including in advanced ovarian cancer and metastatic colorectal cancer. Neither of these studies met their primary endpoints of demonstrating a clinically meaningful extension of progression-free survival and Genentech has
determined that it will not pursue further development of GDC-0449 in these two indications.

Advanced Basal Cell
Carcinoma.In February 2009, Genentech initiated the pivotal phase II clinical trial of GDC-0449, in which approximately 100 patients with locally advanced or metastatic BCC are being evaluated in a single-arm, two-cohort
global clinical trial. One cohort includes all patients with histologically-confirmed, RECIST measurable metastatic BCC. The second cohort includes histologically-confirmed locally advanced BCC that is considered inoperable by the treating
physician. All patients receive a daily oral dose of GDC-0449.



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The primary endpoint in this study is to measure the rate of patient response to GDC-0449 therapy. Roche has stated that it expects results from this study in the first quarter of 2011. There is
currently no standard of care for patients with these types of BCC and, pending successful results, Roche has stated that it could file at least the first regulatory approval submission for GDC-0449 in advanced BCC in 2011.

Standard Response Evaluation Criteria in Solid Tumors, or RECIST, defines disease progression and tumor response based on the sum of the
longest diameters of a set of target tumor lesions identified when the patient enters the trial, which we refer to as baseline. A 20% or greater increase in the sum of diameters in target lesions, or unequivocal progression in non-target lesions, or
the appearance of a new lesion, is defined as disease progression. A reduction in the sum of the diameters of at least 30% as compared to baseline is defined as a partial response. A complete disappearance of target and non-target lesions, and the
normalization of any tumor markers, constitutes a complete response. Both partial and complete responses must be confirmed by repeat assessments at least four weeks after the partial or complete response was first documented. Stable disease refers
to patients who exhibit neither response nor disease progression. Objective response rate is typically defined as the sum of the partial and complete response rates, divided by the number of patients in the study.

This pivotal phase II clinical trial represents a significant development milestone for GDC-0449 in locally advanced and metastatic BCC
and seeks to build upon the encouraging phase I safety and efficacy data demonstrated by the drug, which was highlighted in a September 2009 New England Journal of Medicine article published by the phase I study investigators. This article
reported data on 33 advanced BCC patients who were treated in the phase I clinical trial. Of these patients, 18, or 55%, responded to GDC-0449 including two complete responses and 16 partial responses. Of the remaining 15 patients, 11 patients had
stable disease as a best response and four patients had progressive disease. At the time of the data cut-off for the article, the median time on study and the median duration of response for these patients was 9.8 and 8.8 months, respectively, with
19 patients still on study.

GDC-0449 demonstrated good tolerability in the phase I patients, with no dose limiting toxicities
and no Grade 5, or fatal, adverse events observed. There also were no Grade 4, or life threatening, adverse events observed related to the study drug. There were several Grade 3, or severe, adverse events observed including, fatigue (n=4),
hyponatremia (n=2), weight loss (n=2) and dyspnea (n=2). In addition, single instances of Grade 3 adverse events included muscles spasm, atrial fibrillation, aspiration, back pain, corneal abrasian, dehydration, keratitis, lymphopenia, pneumonia,
urinary tract infection, a prolonged QT interval, increased serum alkaline phosphatase and increased serum potassium. Grade 1, or mild, and Grade 2, or moderate, adverse events included muscle spasms, dysguesia (altered taste sensation), anorexia,
weight decrease, hypocalcemia and dyspepsia. GDC-0449 demonstrated a favorable pharmacokinetic and pharmacodynamic profile with a median steady-state plasma concentration of 16.1 micromole. The median time to reach this steady-state level was 14
days. Dose escalation from 150 mg to 270 mg did not result in higher total plasma concentrations of GDC-0449 and as a result, Genentech has selected a daily dose of 150 mg for the ongoing phase II clinical trials.

Operable Basal Cell Carcinoma.In October 2010, Genentech initiated a phase II clinical trial of GDC-0449
as a single-agent therapy for patients with operable BCC in which Genentech expects to evaluate GDC-0449 in approximately 50 patients with operable nodular BCC in a US-based, open label, two-cohort clinical trial. All patients will receive a 150 mg
daily oral dose of GDC-0449 for 12 weeks. The primary outcome measure for the first cohort is the rate of complete histological clearance of the target nodular BCC lesions at the time of tumor excision, which may occur up to 12 weeks following
initiation of treatment, while the primary outcome measure for the second cohort is the rate of durable complete clearance of target nodular BCC lesions at the time of excision, which may occur up to 36 weeks following initiation of treatment. The
secondary outcome measure for both cohorts is to determine the time to complete histological clinical clearance of target nodular BCC lesions.

There are approximately one million people newly diagnosed with BCC in the U.S. and 2.5 million people diagnosed with BCC worldwide each year, with nodular BCC accounting for an estimated 60% of this
total.



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Other GDC-0449 Clinical Trials.In addition to the ongoing
clinical trials that Genentech and Roche are conducting, Genentech and the NCI entered into a collaborative relationship that allows the NCI to study GDC-0449 in additional potential cancer indications. Third party investigators are conducting
several additional clinical trials with GDC-0449 under this collaboration, including in medulloblastoma, sarcoma and glioblastoma multiforme as well as in pancreatic, small cell lung, gastroesophageal junction/gastric, breast, and prostate cancers,
among others. Furthermore, an investigator-sponsored study evaluating GDC-0449 in patients with basal cell nevus (Gorlin) syndrome has been initiated.

Genentech completed phase II clinical trials of GDC-0449 in advanced ovarian and metastatic colorectal cancer in 2010. In October 2010, Genentech reported that the median time to disease progression in
the phase II ovarian cancer study was 7.5 months for patients who received GDC-0449 compared to 5.8 months for patients who received placebo (HR=0.791, p=0.3944). Genentech concluded that these results did not demonstrate a sufficient clinically
meaningful improvement in progression-free survival to warrant additional clinical testing of GDC-0449 in ovarian cancer. No obvious new safety signals were observed in this study, and ongoing trials in other tumor types have not been impacted by
Genentechs decision.

In June 2010, Roche informed us that the phase II clinical trial in first-line metastatic
colorectal cancer patients did not meet its primary endpoint of extending the time from randomization to disease progression or death in study patients who received GDC-0449 in addition to the current standard of care of bevacizumab and chemotherapy
when compared to those patients who received only the current standard of care treatment. As a result, Roche determined that it would not progress GDC-0449 into phase III testing in this indication.

Under the terms of our June 2003 collaborative research, development and license agreement with Genentech, we granted Genentech an
exclusive, global, royalty-bearing license, with the right to sublicense, to make, use, sell and import small molecule and antibody Hedgehog pathway inhibitors for human therapeutic applications, including cancer therapy. We were
responsible for performing certain funded preclinical research activities through December 2006. In November 2008, Genentech granted a sublicense to Roche for non-U.S. rights to GDC-0449. Roche received this sublicense pursuant to an agreement
between Genentech and Roche under which Genentech granted Roche an option to obtain a license to commercialize certain Genentech products in non-U.S. markets. In February 2010, we announced that Chugai Pharmaceutical Co., Ltd. had exercised its
right of first refusal for the development and commercialization in Japan of GDC-0449 under an existing agreement with Roche.

Genentech and Roche have primary responsibility for worldwide clinical development, regulatory affairs, manufacturing and supply,
formulation and sales and marketing. We are eligible to receive up to $115,000,000 in contingent cash payments for the development of GDC-0449 or another small molecule, assuming the successful achievement by Genentech and Roche of specified
clinical development and regulatory objectives. We have received $18,000,000 of this amount to date. We are also eligible to receive royalties on sales of any Hedgehog pathway inhibitor products that are successfully commercialized by Genentech and
Roche. For GDC-0449, we are entitled to a mid-to-high single digit royalty, which escalates within this range with increasing product sales. In certain specified circumstances, the royalty rate applicable to GDC-0449 may be decreased to a low-to-mid
single digit royalty.

Unless terminated earlier, the agreement will expire six months after the later of the expiration of
Genentechs obligation to pay royalties to us under the agreement or such time as no activities have occurred under the agreement for a period of twelve months. The agreement may be terminated earlier by either party for cause upon sixty days
prior written notice. In addition, Genentech may terminate the agreement, either in whole or in part, without cause, upon six months prior written notice. In the event of any termination where specific license grants survive, we will continue to
have the right to receive clinical development and regulatory approval milestones and royalties on product sales for such licensed compound, if any. If we terminate the agreement for cause or Genentech terminates the agreement without cause, all
licenses granted to Genentech automatically terminate and revert to us. In addition, Genentech has agreed that it will no longer conduct any development or commercialization activities on any compounds identified during the course of
the agreement for so long as such compounds continue to be covered by valid patent claims.



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As a result of our licensing agreements with various universities, we are obligated to make
payments to these university licensors when we receive certain payments from Genentech. From the inception of our Genentech collaboration through December 31, 2010, we have made $900,000 in such payments.

Our Proprietary Network-Targeted Cancer Programs

Over the past several years, targeted cancer drugs have been considered by scientists and clinicians to be among the most promising cancer treatments for obtaining a therapeutic effect with less toxicity
when compared with traditional chemotherapy, which, in addition to attacking cancerous cells, also tends to attack a broad range of healthy cells. A large body of published data shows cancers to have multiple, intersecting signaling pathways, or
networks, that support survival, growth, and invasion. Targeting only one or two of these pathways has generally only led to modest improvements to existing standards-of-care and most cancer patients with solid tumors do not respond in a clinically
meaningful manner. We believe that targeting the correct combination of critical signaling pathways within the network of cancer cell signaling pathways could provide a major improvement in outcomes for cancer patients.

We are utilizing our medicinal chemistry and biological expertise to develop a series of proprietary network-targeted cancer drug
programs. In these programs we are focusing on the development of proprietary, small molecule single-agent drug candidates that target one or more molecular components within the network of signaling pathways associated with certain cancers. Each
proprietary compound is being designed to inhibit one or more validated cancer targets, including, among others, EGFR, Her2, Bcr-Abl tyrosine kinase and phosphatidylinositol-3-kinase, or PI3k, in combination with inhibition of HDAC, which is a
validated non-kinase cancer target. We are also seeking to develop proprietary, differentiated, single-agent, single-target drug candidates for cancer indications.

HDAC inhibition is a core component in each of our network-targeted inhibitors. We believe that HDAC is a very promising non-kinase target for cancer therapy, particularly when combined with simultaneous
inhibition of certain other targets. There is substantial preclinical evidence of synergistic induction of cancer cell death when HDAC inhibitors are combined with a diverse range of other targeted therapies or standard chemotherapeutic agents,
demonstrating that HDAC inhibition may be more broadly effective in the treatment of cancer when integrated with other inhibitory activities. Currently, there are two FDA-approved HDAC inhibitors and several other HDAC-targeted drug candidates in
clinical trials for cancer, many in combination with other agents or modalities.

Our drug discovery efforts utilize
significant medicinal chemistry resources. In furtherance of the development of our network-targeted cancer programs, we outsource certain medicinal chemistry functions with contract research organizations in China. We have developed these
relationships with Chinese providers to support our U.S. operations and we are currently engaging approximately 25 chemists in China. We believe that these relationships have been important to our efforts to create a broad portfolio of proprietary
cancer drugs by generating several classes of compounds for further development in a cost-effective manner.

We have filed a
number of patent applications including a broad omnibus patent application that covers the drug design concept that is the basis for our network-targeted cancer programs, as well as numerous species filings relating to specific classes of compounds
which we believe will constitute novel compositions from a patentability standpoint. We expect that we will continue to file additional patent applications covering new compositions in the future.

CUDC-101

CUDC-101 is the first compound we have selected as a drug candidate from our portfolio of network-targeted cancer programs. CUDC-101 is
designed as a first-in-class single-agent therapeutic to simultaneously inhibit HDAC, EGFR and Her2. In preclinical studies, CUDC-101 demonstrated the potential to inhibit all



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three molecular targets resulting in the potent killing of a wide range of cancer cell lines that are representative of a variety of human cancer types, many of which have demonstrated
resistance to various approved targeted agents.

Our data suggest that CUDC-101s mechanism of action involves the
increased sensitization of cancer cells to EGFR and Her2 inhibition through HDAC inhibition. CUDC-101 simultaneously inhibits both EGFR and Her2 at the receptor level while blocking downstream HDAC inhibition within the cancer cells. Despite the
existence of other molecules that seek to inhibit multiple targets, CUDC-101 is unique in its choice of targets which we believe enables a synergistic attack on multiple nodes or points in the overall pathway network that are used by tumors to
survive, grow, and invade surrounding tissue. Utilizing the same targeted strategy with other currently available drugs would require combining two or three separate agents, which typically have mismatched dosing schedules and may display additive
dose limiting toxicities. In contrast, we believe that CUDC-101, as a single small molecule, has the potential to act in the same cancer cells at the same time with fewer toxic side effects and thus potentially represents an important advance in
targeted agent cancer therapy.

In April 2010, we completed a dose escalation phase I clinical trial of
this molecule. This phase I trial was designed as an open-label, dose escalation study of CUDC-101 in patients with advanced, refractory solid tumors in which the primary objectives were to evaluate the safety and tolerability of escalating doses of
CUDC-101 and to establish the maximum tolerated dose and dose limiting toxicities. Secondary objectives included the assessment of efficacy. The study was conducted at two clinical sites within the United States and enrolled 25 patients across
several dose-escalating cohorts. CUDC-101 demonstrated promising evidence of antitumor activity in this study at doses ranging from 150 milligrams per meter2to 275 milligrams per meter2, including one confirmed partial response that was achieved in a gastric cancer patient at 275 milligrams per
meter2and a stable disease of greater than three months
observed in a refractory breast cancer patient at 150 milligrams per meter2. Two head and neck cancer patients, including one patient with salivary gland adenocarcinoma and one patient with squamous cell carcinoma of the tongue, exhibited anti-tumor activity with a decrease of
greater than 20% in their respective target lesions. We concluded dosing in this phase I dose escalation study in March 2010 and determined that 275 milligrams per meter2represented the maximum tolerated dose of CUDC-101. CUDC-101 also exhibited dose-proportionate increases in
pharmacological parameters and what we believe to be a favorable safety profile. The most frequent adverse events were mild to moderate and included fatigue, vomiting, dyspnea (shortness of breath), pyrexia (fever), and dry skin.

In August 2010, we initiated a phase Ib expansion trial to test CUDC-101 in approximately 50 patients with specific
tumor types, including head and neck, non-small cell lung, breast, gastric and liver cancers. We have treated 38 patients in this trial as of March 3, 2011, and we expect to complete enrollment in the phase Ib study in mid-2011. The phase Ib
expansion trial is designed as an open-label study in which these patients are treated with CUDC-101 at the maximum tolerated dose of 275 milligrams per meter2at between six and eight study centers in the United States. The primary objectives of this study are to compare the
safety and tolerability of CUDC-101 in subjects with specific advanced solid tumors when the drug is administered either on a five days per week schedule (one week on/one week off) or on a three days per week schedule (three weeks on/one week off).
The secondary study objectives include evaluation of the pharmacokinetics and pharmacodynamic biomarkers following CUDC-101 administration and to assess the efficacy of CUDC-101 in this patient population.

We also anticipate initiating a phase I clinical trial of CUDC-101 in advanced head and neck cancer patients whose cancer is HPV negative
during the first half of 2011. Accumulating evidence suggests that HPV positive status is an important prognostic factor associated with a favorable outcome in head and neck cancers. However, HPV negative patients do not respond as well to
standard therapies and, therefore, have more of an unmet clinical need. The primary objective of this study is to evaluate the safety and tolerability of CUDC-101 when administered in combination with the current standard-of-care of cisplatin and
radiation. Upon determination of the maximum tolerated dose and assuming the otherwise successful completion of the phase I trial, we intend to conduct a randomized phase II two-arm clinical trial in which head and neck cancer patients will
receive cisplatin and radiation plus or minus CUDC-101. The phase II part of the study would seek to evaluate whether the addition of CUDC-101 can improve the efficacy and durability of cisplatin and radiation therapy in this patient
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We selected head and neck cancer as our first indication for potential Phase II testing of
CUDC-101 for several reasons. First, CUDC-101 demonstrated biological activity on two patients with head and neck cancer in Phase I dose escalation study, including a mixed response in a head and neck cancer patient at 150 mg/m2 dose level and a
tumor reduction of over 20% after just four weeks of study drug administration in another head and neck cancer patient at the 275 mg/m2 dosing level. Second, our research team generated strong in vitro and in vivo preclinical data in head and neck
cancer, exemplified by data in seven head and neck cancer cell lines that includes some of the highest potency observed of the cell lines in which CUDC-101 was tested. Lastly, we believe that this internal data is supported by published literature
demonstrating that both EGFR and Her2 are often implicated in head and neck cancers.

There are approximately 30,000 newly
diagnosed advanced head and neck cancer patients in the U.S. annually, of which approximately 60-70% have tumors that are HPV negative. It has been shown that head and neck tumors overexpress EGFR in 80-100% of cases, and also overexpress Her2 in
20-40% of cases. CUDC-101 is designed to inhibit both EGFR and Her2, potentially providing an added benefit for patients. CUDC-101 is also designed to target HDAC, which has been demonstrated to provide synergistic effects when combined with
radiation therapy. Lastly, we believe that CUDC-101s current intravenous formulation is suitable for this patient population since patients are required to receive daily radiation treatment for several weeks at their respective clinical
centers.

We are also working on an oral formulation of CUDC-101, which we believe will make CUDC-101 more competitive in
certain cancers such as non-small cell lung cancer where patients are generally on therapy for several months and there are competing molecules that are orally administered. Pending the successful completion of ongoing formulation and preclinical
development work, we intend to file the appropriate regulatory documents for use of an oral formulation of CUDC-101 in clinical trials late in 2011.

CUDC-907

In January 2011, we selected development candidate
CUDC-907, an orally bioavailable, network-targeted small molecule that is designed to inhibit HDAC and phosphatidylinositol-3-kinase, or PI3K. Pending the successful completion of ongoing formulation and preclinical development work, we expect to
file an IND for an oral formulation of CUDC-907 late in 2011.

Our scientists developed CUDC-907 based on published and
internally generated data demonstrating that HDAC and PI3K inhibitors have synergistic interaction against cancer cells. In vitro mechanism of action studies demonstrate that CUDC-907 is able to inhibit Class I PI3Ks and upregulate molecules
involved in cancer cell death. CUDC-907 has also demonstrated the ability to suppress multiple nodes of other survival pathways as a result of the epigenetic modification resulting from the inhibition of its non-kinase HDAC target. By contrast, we
believe that the single-target PI3K inhibitors currently in clinical development only target the primary PI3K survival pathway and have been reported to have only limited effects on tumors with disregulation of other signaling pathways.

CUDC-907 displays high exposure and long half-life in tumor tissue after IV administration and is orally bioavailable in animals.
CUDC-907 exhibits anti-proliferation activity against a broad range of cancer cell types in in vitro studies, including cell lines that exhibit reduced sensitivity to single-target PI3K inhibitors. CUDC-907s anti-proliferation activity
has been demonstrated to be up to 100-fold more potent than that of two leading PI3K inhibitors in development. CUDC-907 also inhibits tumor growth in preclinical xenograft models of hematology cancers and solid tumors with K-RAS mutations that
exhibit reduced sensitivity to PI3K inhibitors, indicating that this compound may have broader activity than other leading PI3K inhibitors currently in clinical development. This compound also displays a favorable safety profile in our early safety
evaluation. We believe that its synergistic mechanism of cancer signaling network disruption, efficacy in a number of preclinical xenograft models and favorable safety profile could translate into clinical advantages over single agents.



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Other Network-Targeted Cancer Programs

In addition to our development-stage programs, we continue to progress additional proprietary research programs and expect that we will
select additional small molecule inhibitors from our preclinical portfolio in the future.

Debio 0932 (formerly CUDC-305)

Heat shock protein 90, or Hsp90, is a member of a class of proteins called molecular chaperones that play a
fundamental role in the folding, stabilization and degradation of other cellular proteins, or clients, under normal or stressful conditions. Hsp90, in particular, has become an attractive therapeutic target for the treatment of cancer because a
majority of its client proteins are involved in cellular signaling transduction and have been identified as potential contributors to various aspects of cancer cell growth and survival. Inhibitors of Hsp90 activity may be of therapeutic value if
they can prevent Hsp90 proteins from protecting the particular client proteins involved in cancer and allow them to be degraded, thereby inducing cancer cell death. In our preclinical studies, our lead candidate CUDC-305 (now Debio 0932)
demonstrated potent efficacy across a broad range of cancers in preclinical cancer models and exhibited promising pharmacological features in preclinical testing, particularly its high oral bioavailability, high tumor penetration and extended tumor
retention. Tumor regression was also observed after treatment of CUDC-305 in mouse xenograft models of acute myelogenous leukemia (AML), breast, non-small cell lung, gastric and colon cancers as well as in glioblastoma brain cancers. In our
preclinical testing, the compound also demonstrated an ability to effectively cross the blood brain barrier and extend survival in preclinical intracranial glioblastoma and brain metastasis models.

In August 2009, we granted a worldwide, exclusive royalty-bearing license to develop, manufacture, market and sell our Hsp90 inhibitor
technology, including our preclinical development candidate, CUDC-305, to Debiopharm. CUDC-305 has been renamed Debio 0932 by Debiopharm. Debiopharm has assumed all future development responsibility for Debio 0932 and Debiopharm or a Debiopharm
licensee will incur all future costs related to the development, registration and commercialization of products under the agreement.

In April 2010, Debiopharm treated the first patient in a phase I clinical trial of this molecule. The first part of the study (Phase Ia) is an open-label, multi-center, dose escalation trial evaluating
the safety and tolerability of escalating multiple dose levels of Debio 0932 as a single agent given orally in patients suffering from advanced solid tumors or lymphoma. The dose-limiting toxicities, maximum tolerated dose, and pharmacokinetic
parameters will be determined by using both every other day and daily administration regimens. Resulting data will guide the recommended Phase Ib dose and schedule. The secondary objective will be to assess whether changes in pharmacodynamic
biomarkers indicative of Hsp90 inhibition by Debio 0932 can be reliably measured in patient samples.

The objective of the
Phase Ib study, an expansion cohort of certain solid tumor and/or lymphoma patients, will be to further assess the safety profile, pharmacokinetics and pharmacodynamics of Debio 0932 at a potential Phase II dose level, and to make a preliminary
assessment of anti-tumor activity in patients with advanced solid tumors.

As part of the consideration under the agreement,
Debiopharm paid us an up-front license fee of $2,000,000. In addition, during 2010, we earned $11,000,000 in contingent payments upon Debiopharms successful achievement of clinical objectives, including the approval from French regulatory
authorities of Debiopharms clinical trial application, or CTA, to begin phase I clinical trials and the treatment of the fifth patient in this trial. We are eligible to receive up to an additional $77,000,000 if specified clinical development
and regulatory approval objectives are met. We will receive our next contingent payment under this license agreement when and if Debiopharm treats the fifth patient in a phase II clinical trial. We are also eligible to receive royalties if any
products under the license agreement are successfully developed and commercialized. For net sales of Debio 0932 that are made directly by Debiopharm, we are entitled to a high single digit to low double digit royalty, which escalates within this
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rate applicable to Debio 0932 may be reduced. We believe that it is more likely that Debiopharm will sublicense Debio 0932 following its further development, and in this case we are entitled to a
share of royalties that Debiopharm receives from such sublicensee.

The agreement is effective as of
August 5, 2009, and unless terminated earlier will expire, on a country-by-country basis, on the later of (i) the expiration of the last-to-expire valid claim of the Curis patents and joint patents relating to the products, and
(ii) the 10thanniversary of the first commercial
sale of the product in such country. Debiopharm may terminate the agreement prior to its expiration at any time for any scientific, technical, administrative or commercial reasons upon 90 days prior written notice to us. If Debiopharm is
permanently enjoined from exercising its license under the agreement pursuant to a patent infringement action brought by a third party, or if neither Debiopharm nor we undertake the defense or settlement of a third party suit alleging infringement
within the six-month period after notice of such suit, then Debiopharm may terminate the agreement in the country where such suit was filed upon thirty days prior written notice to us. If Debiopharm does not correct a failure to use reasonable
commercial efforts as set forth in the agreement, we may terminate the agreement on thirty days written notice to Debiopharm unless Debiopharm cures such failure before the end of such thirty day period. Either party may terminate the
agreement prior to its expiration subject to certain conditions, upon ninety days (or forty-five days in the case of failure to make payment of amounts due under the agreement) prior written notice to the other party in the event of the
material breach of any term or condition of the agreement by the other party, unless the breaching party has cured such breach by the end of the applicable cure period; and immediately upon written notice to the other party if the other party or its
affiliate directly, or through assistance granted to a third party, challenges, whether as a claim, a cross-claim, counterclaim, or defense, the validity or enforceability of any of such partys patents before any court, arbitrator, or other
tribunal or administrative agency in any jurisdiction.

Corporate Information

We were organized as a Delaware corporation in February 2000. We began our operations in July 2000 upon the completion of the merger of
Creative BioMolecules, Inc., Ontogeny, Inc. and Reprogenesis, Inc. Our principal executive office is located at 4 Maguire Road, Lexington, MA 02421 and our telephone number is (617) 503-6500.

Curis is our trademark. This annual report on Form 10-K may also contain trademarks and trade names of others.

Website Access to Reports

We maintain a website with the address
www.curis.com. We are not including the information contained in our website as part of, or incorporating it by reference into, this annual report on Form 10-K. Our website address is included in this annual report on Form 10-K as an inactive
textual reference only. We make available free of charge through our website our annual reports on Form 10-K, our quarterly reports on Form 10-Q, current reports on Form 8-K and any such amendments to those reports as soon as reasonably practicable
after we electronically file such material with, or furnish such material to, the Securities and Exchange Commission. The Securities and Exchange Commission maintains a website, www.sec.gov, that contains reports, proxy and information statements
and other information regarding issuers that file electronically with the SEC. The public may read and copy any materials we file with the Securities and Exchange Commission at the SECs Public Reference Room at 100 F Street, N.E., Washington,
D.C. 20549. In addition, we provide paper copies of our filings free of charge upon request. The public may obtain information on the operation of the public reference room by calling 1-800-SEC-0330. We also make available on our website our
corporate governance guidelines, the charters for our audit committee, compensation committee and nominating and corporate governance committee, and our code of business conduct and ethics, and such information is available in print to any
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Intellectual Property

Our policy is to obtain and enforce the patents and proprietary technology rights that are key to our business. We intend to continue to file U.S. and foreign patent applications to protect technology,
inventions and improvements that are considered important to the development of our business. We will be able to protect our proprietary technologies from unauthorized use by third parties only to the extent that our proprietary rights are covered
by valid and enforceable patents or are effectively maintained as trade secrets.

In the U.S., we have 72 issued or allowed
patents expiring on various dates between 2013 and 2027 as well as numerous pending patent applications. We have foreign counterpart patent filings for most of our U.S. issued patents and patent applications. These patents and patent applications
are directed to various inventions including compositions of matter, methods of making and using these compositions for multiple applications, methods for drug screening and discovery, developmental biological processes, and patents which relate to
our proprietary technologies.

Hedgehog Pathway.    We have 65 issued U.S. patents or allowed U.S.
applications expiring on various dates between 2013 and 2026, which relate to the Hedgehog pathway. Our patents and patent applications cover proteins, nucleic acids, antibodies, and certain small molecule agonists and inhibitors of the Hedgehog
pathway, drug screening and discovery methods, methods of protein manufacturing, as well as methods of using the aforementioned proteins, nucleic acids, antibodies or small molecules to activate or inhibit the Hedgehog pathway for a variety of
therapeutic indications or diagnostic uses. In addition, we have filed foreign patent applications corresponding to many of the aforementioned U.S. filings that could provide additional patent protection for products that activate or inhibit the
Hedgehog pathway.

Our academic and research institution collaborators have certain rights to publish data and information
regarding their discoveries to which we have rights. While we believe that the prepublication access to the data developed by our collaborators pursuant to our collaboration agreements will be sufficient to permit us to apply for patent protection
in the areas in which we are interested in pursuing further research, there is considerable pressure on such institutions to rapidly publish discoveries arising from their efforts. This may affect our ability to obtain patent protection in the areas
in which we may have an interest. In addition, these collaboration agreements typically contain provisions that provide us with, at a minimum, an option to license the institutions rights to intellectual property arising from the
collaboration.

Network-Targeted Cancer Drug Development Platform.    We have four issued or
allowed U.S. patents which expire in 2027 and several U.S. provisional patent applications and U.S. and foreign utility patent applications directed to our targeted inhibitor classes of novel small molecules, as well as U.S. and foreign patent
applications which generically claim the platform concept itself. Our patents and patent applications cover compositions of matter, methods of manufacturing these molecules, formulations, and methods of using these molecules to treat a variety of
therapeutic indications. We intend to continue to file additional U.S. and foreign applications as the programs progress.

We
are party to various license agreements that give us rights to commercialize various technologies, particularly our Hedgehog pathway technologies, and to use technologies in our research and development processes. The consideration payable in
exchange for these licenses includes up-front fees, issuances of shares of common stock, annual royalties, milestone payments and royalties on net sales by our sub-licensees and us. The licensors may terminate these agreements if we fail to meet
certain diligence requirements, fail to make payments or otherwise commit a material breach that is not cured after notice.

In addition, we depend upon trade secrets, know-how and continuing technological advances to develop and maintain our competitive
position. To maintain the confidentiality of trade secrets and proprietary information, we require our employees, scientific advisors, consultants and collaborators, upon commencement of a relationship with us, to execute confidentiality agreements
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development collaborators, to agree to assign their inventions to us. These agreements are designed to protect our proprietary information and to grant us ownership of technologies that are
developed in connection with their relationship to us.

Research and Development Program

We have a research group that seeks to identify and develop new therapeutic products and applications thereof for our existing proprietary
portfolio and seeks to identify novel compounds able to modulate additional signaling pathways that may have therapeutic potential. As of December 31, 2010, our research and development group consists of 22 employees, consisting of molecular
biologists, cell biologists, chemists, pharmacologists and other scientific disciplines. We have also engaged approximately 25 medicinal chemists on a contract basis at a contract research organization in China.

We had no collaborator-sponsored research and development expense for the years ended December 31, 2010 and 2009 as all research
funding under collaborations concluded in 2008. During the year ended December 31, 2008, our total company-sponsored research and development expenses were approximately $13,092,000, and our collaborator-sponsored research and development
expenses were approximately $134,000.

Regulatory Matters

FDA Requirements for New Drug Compounds

Numerous governmental authorities in the U.S. and other countries extensively regulate, among other things, the research, testing, manufacture, import and export and marketing of drug products. In the
U.S., drugs are subject to rigorous regulation by the FDA. The Federal Food, Drug, and Cosmetic Act, and other federal and state statutes and regulations, govern, among other things, the research, development, testing, manufacture, storage,
recordkeeping, labeling, promotion, sampling and marketing and distribution of pharmaceutical products. Failure to comply with applicable regulatory requirements may subject a company to a variety of administrative or judicially imposed sanctions.
These sanctions could include, among other things, the FDAs refusal to approve pending applications, withdrawal of approvals, clinical holds, warning letters, product recalls, product seizures, total or partial suspension of our operations,
injunctions, fines, civil penalties or criminal prosecution.

The steps ordinarily required before a new pharmaceutical
product may be marketed in the U.S. include preclinical laboratory tests, animal tests and formulation studies under the FDAs good laboratory practice, or GLP, regulations; the submission to the FDA of a notice of claimed investigational
exemption or an IND application, which must become effective before clinical testing may commence; adequate and well-controlled clinical trials to establish the safety and effectiveness of the drug for each indication for which FDA approval is
sought; submission to the FDA of a new drug application, or NDA, seeking approval to market the drug product; satisfactory completion of an FDA inspection of the manufacturing facility or facilities at which the product is produced to assess
compliance with current good manufacturing practice, or cGMP, requirements; and FDA review and approval of the NDA. Satisfaction of FDA pre-market approval requirements typically takes years, and the actual time required may vary substantially based
upon the type, complexity and novelty of the product or disease. Success in early stage clinical trials does not assure success in later stage clinical trials. Data obtained from clinical activities is not always conclusive and may be susceptible to
varying interpretations that could delay, limit or prevent regulatory approval. Even if a product receives regulatory approval, later discovery of previously unknown problems with a product, including new safety risks, may result in restrictions on
the product or even complete withdrawal of the product from the market.

Preclinical tests include laboratory evaluation of
product chemistry and formulation, as well as animal trials to assess the potential safety and efficacy of the product. The conduct of the preclinical tests and formulation of compounds for testing must comply with federal regulations and
requirements, including the FDAs GLP regulations. Preclinical testing is highly uncertain and may not be completed successfully within any specified



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time period, if at all. Further, the successful completion of preclinical trials does not assure success in human clinical trials. The results of preclinical testing are submitted to the FDA as
part of an IND application, together with manufacturing information and analytical and stability data of the drug formulation. The IND application must become effective before clinical trials can begin in the United States. An IND application
becomes effective 30 days after receipt by the FDA unless before that time the FDA places a clinical hold on the trials. In that case, the IND application sponsor and the FDA must resolve any outstanding FDA concerns or questions before clinical
trials can proceed. If these concerns or questions are unresolved, the FDA may not allow the clinical trials to commence.

Clinical trials involve the administration of the investigational drug to healthy volunteers or patients under the supervision of a
qualified investigator. Clinical trials must be conducted in compliance with federal regulations and requirements, including good clinical practices, under protocols detailing, among other things, the objectives of the trial, the parameters to be
used in assessing safety and the effectiveness criteria to be evaluated. Each protocol involving testing on U.S. subjects must be submitted to the FDA as part of the IND application. The study protocol and informed consent information for patients
in clinical trials must be submitted to institutional review boards, or IRBs, for approval.

Clinical trials to support NDAs
for marketing approval are typically conducted in three sequential phases, but the phases may overlap or be combined. In phase I, the initial introduction of the drug into human subjects, the drug is tested to assess metabolism, pharmacokinetics and
pharmacological actions and safety, including side effects associated with increasing doses and, if possible, early evidence of effectiveness. Phase II usually involves trials in a limited patient population, to determine dosage tolerance and
optimum dosage, identify possible adverse effects and safety risks, and provide preliminary support for the efficacy of the drug in the indication being studied. If a compound demonstrates evidence of effectiveness and an acceptable safety profile
in phase II evaluations, phase III trials are undertaken to further evaluate clinical efficacy and to further test for safety within an expanded patient population, typically at geographically dispersed clinical trial sites to establish the overall
benefit-risk relationship of the drug and to provide adequate information for the labeling of the drug. Phase I, phase II or phase III testing of any drug candidates may not be completed successfully within any specified time period, if at all. The
FDA closely monitors the progress of each of the three phases of clinical trials that are conducted in the U.S. The FDA may, at its discretion, reevaluate, alter, suspend or terminate the testing based upon the data accumulated to that point and the
FDAs assessment of the risk/benefit ratio to the subject. The FDA, an IRB, or a clinical trial sponsor may suspend or terminate clinical trials at any time for various reasons, including a finding that the subjects or patients are being
exposed to an unacceptable health risk. The FDA can also request that additional clinical trials be conducted as a condition to product approval. Finally, sponsors are required to publicly disseminate information about ongoing and completed clinical
trials on a government website administered by the National Institutes of Health, or NIH, and are subject to civil money penalties and other civil and criminal sanctions for failing to meet these obligations.

After successful completion of the required clinical testing, generally an NDA is prepared and submitted to the FDA. FDA approval of the
NDA is required before marketing of the product may begin in the United States. The NDA must include the results of extensive preclinical and clinical testing and a compilation of data relating to the products pharmacology, chemistry,
manufacture, and controls. In most cases, a substantial user fee must accompany the NDA.

If the FDAs evaluation of the
NDA and inspection of the manufacturing facilities are favorable, the FDA may issue an approval letter, or, in some cases, a complete response letter. A complete response letter generally contains a statement of specific conditions that must be met
in order to secure final approval of the NDA. If and when those conditions have been met to the FDAs satisfaction, the FDA will typically issue an approval letter. An approval letter authorizes commercial marketing of the drug with specific
prescribing information for specific indications. As a condition of NDA approval, the FDA may require post-approval testing, including phase IV trials, and surveillance to monitor the drugs safety or efficacy and may impose other conditions,
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market and profitability of the drug. Once granted, product approvals may be withdrawn if compliance with regulatory standards is not maintained or problems are identified following initial
marketing.

Once the NDA is approved, a product will be subject to certain post-approval requirements, including requirements
for adverse event reporting, submission of periodic reports, and drug sampling and distribution requirements. If new safety issues arise after approval, the FDA may require the company to conduct additional post-market studies to assess the risk,
change the labeling to address the risk, or impose distribution and use restrictions under a Risk Evaluation and Mitigation Strategy, or REMS. Additionally, the FDA strictly regulates the promotional claims that may be made about prescription drug
products. In particular, a drug may not be promoted for uses that are not approved by the FDA as reflected in the drugs approved labeling. Moreover, the Department of Justice can bring civil or criminal actions against companies that promote
drugs for unapproved uses, based on the Federal Food, Drug, and Cosmetic Act, the False Claims Act and other federal laws governing reimbursement for drugs under the Medicare and Medicaid laws. Monetary penalties in such cases have often been in
excess of $100 million and in some cases have exceeded $1 billion. In addition, the FDA requires substantiation of any claims of superiority of one product over another including, in many cases, requirements that such claims be proven by adequate
and well-controlled head-to-head clinical trials. After approval, some types of changes to the approved product, such as adding new indications, manufacturing changes and additional labeling claims, are subject to FDA review and approval of a new
NDA or NDA supplement before the change can be implemented. Manufacturing operations must continue to conform to cGMPs after approval. Drug manufacturers are required to register their facilities with the FDA and are subject to periodic unannounced
inspections by the FDA to assess compliance with cGMPs. Accordingly, manufacturers must continue to expend time, money and effort in the area of production and quality control to maintain compliance with cGMPs and other aspects of regulatory
compliance.

If the FDAs evaluation of the NDA submission or manufacturing facilities is not favorable, the FDA may
refuse to approve the NDA or issue a complete response letter. The complete response letter outlines the deficiencies in the submission and may require additional testing or information in order for the FDA to reconsider the application. Even with
submission of this additional information, the FDA ultimately may decide that the application does not satisfy the regulatory criteria for approval. With limited exceptions, the FDA may withhold approval of a NDA regardless of prior advice it may
have provided or commitments it may have made to the sponsor.

Foreign Regulation of New Drug Compounds

Approval of a drug product by comparable regulatory authorities will be necessary in foreign countries prior to the commencement of
marketing of the product in those countries, whether or not FDA approval has been obtained. While clinical data generated in the U.S. may be accepted in many foreign jurisdictions in lieu of early stage clinical trials (phase I), the approval
procedure varies among countries and can involve requirements for additional testing equivalent to phases II and III. The time required may differ from that required for FDA approval and may be longer than that required to obtain FDA approval. There
can be substantial delays in obtaining required approvals from foreign regulatory authorities after the relevant applications are filed.

In Europe, marketing authorizations may be submitted under a centralized or decentralized procedure. The centralized procedure is mandatory for the approval of biotechnology products and many
pharmaceutical products, and provides for the grant of a single marketing authorization, which is valid in all European Union member states. The decentralized procedure is a mutual recognition procedure that is available at the request of the
applicant for medicinal products that are not subject to the centralized procedure.

Hazardous Materials

Our research and development processes involve the controlled use of hazardous materials, chemicals and radioactive materials and produce
waste products. We are subject to federal, state and local laws and regulations governing the use, manufacture, storage, handling and disposal of hazardous materials and waste products.



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Competition

Our drug candidates, if approved, will compete with existing and new products being developed by others for treatment of the same indications. Competition in the development of human therapeutics and, in
particular, human therapeutics that target signaling pathways to treat cancers, is intense. Our competitors include large pharmaceutical and biopharmaceutical companies, as well as specialized biotechnology firms, that are developing cancer
therapies in the same indications as we are.

Hedgehog Pathway Inhibitor Program.    We are aware
of several biotechnology and pharmaceutical companies that have drug development programs relating to compounds that modulate the Hedgehog pathway. We believe that there are currently at least four other companies that have progressed Hedgehog
pathway inhibitors into clinical development: Infinity Pharmaceuticals, Inc.; Exelixis, Inc. (in co-development with the Bristol-Myers Squibb Company); Pfizer Inc.; and Novartis International AG.

Network-Targeted Cancer Programs.    There are several companies developing drug candidates that target the
same cancer pathways that we are also targeting or that are testing drug candidates in the same cancer indications that we are testing through our proprietary network-targeted cancer programs. We believe that our competitive advantage over these
companies is our strategy of developing drug candidates that target unique combinations of these cancer pathways to achieve synergistic effect. For example, several companies are investigating Hsp90 inhibitors in clinical testing, including, among
others Bristol-Myers Squibb Company, Novartis International AG, Pfizer Inc., Astex Therapeutics Ltd., Myriad Pharmaceuticals Inc., Kyowa Hakko Kirin Co, Ltd., and Synta Pharmaceuticals Corp. There are commercially-available drugs that individually
target either HDAC or EGFR as well as a drug that targets EGFR/Her2. There are also several drugs candidates in clinical testing that are designed to inhibit one or more of these targets. However, we are not aware of other molecules in clinical
testing that are designed to simultaneously target HDAC, EGFR and Her2 simultaneously.

Many of the companies competing
against us have financial, marketing and human resource capacities that are substantially greater than our own, which may provide these competitors with significant competitive advantages over us. Others have extensive experience in undertaking
clinical trials, in obtaining regulatory approval to market products, in manufacturing products on a large scale and in effectively promoting products to healthcare providers, health plans and consumers which may enhance their competitive position
relative to ours. In addition to competing with pharmaceutical and biotechnology companies, the products we are developing would also compete with those being developed by academic and research institutions, government agencies and other public
organizations. Any of these organizations may discover new therapies, seek patent protection or establish collaborative arrangements for products and technologies that are competitive with our products and technologies.

The technologies underlying the development of human therapeutic products are expected to continue to undergo rapid and significant
advancement and unpredictable changes. Accordingly, our technological and commercial success will be based, among other things, on our ability to develop proprietary positions in key scientific areas and efficiently evaluate potential product
opportunities.

The timing of a products introduction may be a major factor in determining eventual commercial success
and profitability. Early entry may have important advantages in gaining product acceptance and market share. Accordingly, we believe the relative speed with which we or any current or future collaborator can complete preclinical and clinical
testing, obtain regulatory approvals, and supply commercial quantities of a product will have an important impact on our competitive position, both in the U.S. and abroad. Other companies may succeed in developing similar products that are
introduced earlier, are more effective, or are produced and marketed more effectively, or at a minimum obtain a portion of the market share. For example, our competitors may discover, characterize and develop important targeted cancer molecules
before we do, which could have a material adverse effect on any of our related research programs. If research and development by others renders any of our products obsolete or noncompetitive, then our potential for success and profitability may be
adversely affected.



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For certain of our programs, we rely on, or intend to rely on, strategic collaborators for
support in our research programs and for preclinical evaluation and clinical development of our potential products and manufacturing and marketing of any products. Our strategic collaborators may conduct multiple product development efforts within
each disease area that is the subject of our strategic collaboration with them. Our strategic collaboration agreements may not restrict the strategic collaborator from pursuing competing internal development efforts. Any of our drug candidates,
therefore, may be subject to competition with a drug candidate under development by a strategic collaborator.

Manufacturing

We have no experience or capabilities in manufacturing. We currently rely on collaborators or subcontractors, and we have
no plans to develop our own manufacturing capability. Instead, we plan to continue to rely on corporate collaborators or subcontractors to manufacture products. If any of our current or planned collaborators or subcontractors encounters regulatory
compliance problems or enforcement actions for their own or a collaborative product, it could have a material adverse effect on our business prospects.

Sales and Marketing

We have no sales, marketing or distribution experience
or infrastructure and we have no current plans to develop sales, marketing and distribution capabilities. We currently plan to rely on corporate collaborators for product sales, marketing and distribution.

Employees

As of
December 31, 2010, we had 32 full-time employees, of whom 10 hold a Ph.D. or other advanced degree. Of these employees, 22 are currently involved in research and development. None of our employees is a party to a collective bargaining
agreement, and we consider our relations with our employees to be good.



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Scientific Governance

We have established a scientific advisory board as well as a clinical advisory board, each made up of leading scientists and physicians in the field of cancer research and drug development. Members of
these boards consult with us on matters relating to our research and development programs, including clinical trial design, new technologies relevant to our research and development programs and other scientific and technical issues relevant to our
business.

The current members of our scientific advisory board are as follows:



|                                   |  |                                                                                                                                                                                                                                                                                                                                                                                           
|---------------------------------- |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|Name                               |  | Position/Institutional Affiliation                                                                                                                                                                                                                                                                                                                                                        
|Kenneth J. Pienta, M.D. (Chairman) |  | Professor of Internal Medicine and Urology Director, Experimental Therapeutics, Michigan Center for Translational Pathology American Cancer Society Clinical Research Professor
Director, Michigan Institute for Clinical and Health Research Associate Dean for Clinical and Translational Research, Medical School President-Elect Society for Clinical and Translational Science (SCTS)
|                                   | 
|Stuart A. Aaronson, M.D.           |  | Jane B. and Jack R. Aron Professor Chairman of the Department of Oncological Sciences Mount Sinai School of Medicine, NY                                                                                                                                                                                                                                                                  
|                                   | 
|Joseph M. Davie, Ph.D., M.D.       |  | Director, Curis, Inc.
Director, Ocera, Inc. Director, Stratatech
Corporation Director, MemoryLink Corporation Director, Multiple Sclerosis Research Center of New York Member, Institute of
Medicine                                                                                                                                                                                      
|                                   | 
|George F. Vande Woude, Ph.D        |  | Distinguished Scientific Fellow, Van Andel Research Institute Co-editor, Advances in Cancer Research                                                                                                                                                                                                                                                                                      



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The current members of our clinical advisory board are as follows:



|                                        |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|--------------------------------------- |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|Name                                    |  | Position/Institutional Affiliation                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Kenneth J. Pienta, M.D. (Chairman)      |  | See scientific advisory board table                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|Philip A. Philip, M.D., Ph.D., F.R.C.P. |  | Professor of Medicine, Wayne State University School of Medicine Professor of Oncology, Barbara Ann Karmanos Cancer Institute Director of Gastrointestinal
Oncology, Chair of Protocol Review and Monitoring Committee, Member of Intergroup Task Force on Pancreas Cancer, Pancreas Cancer Sub-Committee Chair at the Southwest Oncology Group Editorial Boards, Journal of Gastrointestinal Cancer, Community Oncology, Translational Oncology
Member of American Pancreatic Association, American Society of Clinical Oncology, American Association for Cancer research, International Liver Cancer
Association, Journal of Gastrointestinal Cancer American Board Certified in Internal Medicine and Medical Oncology and Fellow of the
Royal College of Physicians of the UK
|Samir E. Witta, M.D., Ph.D.             |  | President, Mountain Blue Cancer Care Center Assistant Clinical Professor, University of Colorado Cancer Center                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    



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|ITEM 1A. | RISK FACTORS
|-------- | ------------

RISKS
RELATING TO THE DEVELOPMENT AND COMMERCIALIZATION OF OUR PRODUCTS

The successful development of our most advanced product candidate,
GDC-0449, is important to our success as a company. GDC-0449 is still in clinical development. If Genentech does not successfully continue or complete the clinical development of GDC-0449, our ability to earn milestone payments or royalty revenue,
our likelihood of success as a company and our ability to finance our operations will be substantially harmed.

Our
near-term prospects substantially depend upon Genentechs ability to successfully continue and complete clinical trials of our lead product candidate, GDC-0449 and to demonstrate its safety and efficacy, as well as its superiority over existing
therapies and standards of care, if any. Genentech, a member of the Roche Group, is currently testing GDC-0449 in a pivotal phase II clinical trial in advanced BCC and in a phase II clinical trial in operable BCC. In addition, through a
collaborative research and development agreement between Genentech and the National Cancer Institute, or NCI, the molecule is also being tested in several additional NCI-sponsored trials. All of our other potential product candidates are in
preclinical research or early clinical development. Our ability to finance our company and to generate revenues will depend heavily on the ability of Genentech and Roche to obtain favorable results in the ongoing and planned clinical trials of
GDC-0449, including the ongoing clinical trials in BCC, and to successfully develop and commercialize GDC-0449. GDC-0449 could be unsuccessful if it:



| |  |  | does not demonstrate acceptable safety and efficacy in clinical trials, or otherwise does not meet applicable regulatory standards for approval;
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | does not offer sufficient, clinically meaningful therapeutic or other improvements over existing or future drugs used to treat the cancer indications
for which it is being tested, as occurred in Genentechs recently-completed phase II clinical trials of GDC-0449 in colorectal cancer and ovarian cancer;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | is not capable of being produced in commercial quantities at acceptable costs; or
| | - |  | ---------------------------------------------------------------------------------



| |  |  | is not accepted as safe, efficacious, cost-effective, less costly and preferable to current therapies in the medical community and by third-party
payors.
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------

If Genentech is not successful in developing and commercializing GDC-0449 or is significantly
delayed in doing so, our financial condition and future prospects may be adversely affected, we may experience difficulties in raising the substantial additional capital required to fund our business and our stock price may decline.

The therapeutic efficacy of drug candidates being developed in our network-targeted cancer programs is unproven in humans, and we may not be able to
successfully develop and commercialize CUDC-101 or any other future drug candidates that we may select from these programs.

Our internal drug development efforts are focused on our proprietary network-targeted cancer programs. These programs focus on the
development of single-agent drug candidates targeting one or more molecular components within signaling pathways associated with certain cancers. We are also seeking to develop single-agent, single-target drug candidates for cancer indications. We
have currently selected three drug candidates from these proprietary network-targeted cancer programs for further development: CUDC-101, which is designed to simultaneously inhibit HDAC, EGFR and Her2, Debio 0932, an orally available, synthetic
small molecule inhibitor of Hsp90 that was licensed to Debiopharm in August 2009, and CUDC-907, an orally available synthetic small molecule inhibitor of HDAC and PI3K that we are developing internally.

Our drug candidates in our network-targeted cancer program, including CUDC-101, Debio 0932 and CUDC-907, are novel compounds and their
potential benefit as therapeutic cancer drugs is unproven. These drug candidates may not prove to be effective inhibitors of the validated cancer targets they are being designed to act against and may not demonstrate in patients any or all of the
pharmacological benefits that we believe they may



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possess or that may have been demonstrated in preclinical studies. Moreover, there is a risk that these drug candidates may interact with human biological systems in unforeseen, ineffective or
harmful ways. As a result of these and other risks described herein that are inherent in the development of novel therapeutic agents, we may never successfully develop, enter into or maintain third party licensing or collaboration transactions with
respect to, or successfully commercialize CUDC-101, Debio 0932, CUDC-907 or any other drug candidates from our network-targeted cancer programs, in which case we will not achieve profitability and the value of our stock will decline.

We depend on third parties for the development of certain of our programs. If one or more of our collaborators fails or delays in developing or
commercializing drug candidates based upon our technologies, our business prospects and operating results would suffer and our stock price would likely decline.

We currently have a collaboration with Genentech pursuant to which we have granted to Genentech exclusive rights to develop and commercialize products based upon our Hedgehog pathway technologies.
GDC-0449, an orally-administered small molecule Hedgehog pathway inhibitor, is the lead compound under this collaboration. Genentech is currently testing GDC-0449 in a pivotal phase II trial in advanced BCC and in a phase II trial in operable BCC.
In addition, we entered into a license agreement with Debiopharm pursuant to which Debiopharm is testing our licensed heat shock protein 90, or Hsp90, product candidate, Debio 0932, in a phase I clinical trial in advanced solid tumors and lymphoma.
Our collaboration with Genentech and our license agreement with Debiopharm are our only current material collaborations, and these collaborations may not be scientifically or commercially successful due to a number of factors, including the
following:



| |  |  | Genentech and Debiopharm each have significant discretion in determining the efforts and resources that they will apply to their respective
collaboration with us. The timing and amount of any cash payments related to future royalties and the achievement of development objectives that we may receive under such collaborative arrangements will depend on, among other things, our
collaboration partners efforts, allocation of resources and successful development and commercialization of our drug candidates under the respective agreement.
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Our strategic collaboration agreement with Genentech and our license agreement with Debiopharm permit such parties wide discretion in deciding which
drug candidates to advance through the clinical trial process. It is possible for Genentech or Debiopharm to reject drug candidates at any point in the research, development and clinical trial process, without triggering a termination of the
collaboration or license agreement, as applicable. In the event of any such decision, our business and prospects may be adversely affected and we may not have the commercial rights or the resources necessary to advance such programs on our own.
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Genentech and Debiopharm may develop and commercialize, either alone or with others, products that are similar to or competitive with the drug
candidates that are the subject of its collaborations with us. For example, Genentech and Debiopharm each are developing several other programs in cancer.
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Genentech or Debiopharm may change the focus of their development and commercialization efforts or pursue higher-priority programs. Our ability to
successfully commercialize drug candidates under collaboration with Genentech or Debiopharm could be limited if Genentech or Debiopharm decreases or fails to increase spending related to such drug candidates.
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Genentech or Debiopharm may enter into one or more transactions with third parties, including a merger, consolidation, reorganization, sale of
substantial assets, sale of substantial stock or change of control. For example, during the first quarter of 2009, Roche Holdings Ltd. completed its acquisition of Genentech. This merger with Roche could divert the attention of Genentechs
management and adversely affect Genentechs ability to retain and motivate key personnel who are important to the continued development of the programs under our collaboration. In addition, an acquirer could determine to reprioritize
Genentechs or Debiopharms development programs such that Genentech or Debiopharm ceases to diligently pursue the development of our programs, and/or cause the respective collaborations with us to terminate.
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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| |  |  | Genentech or Debiopharm may, under specified circumstances, terminate their collaboration with us on short notice and for circumstances outside of our
control, which could make it difficult for us to attract new collaborators or adversely affect how we are perceived in the scientific and financial communities.
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Genentech and Debiopharm have the first right to maintain or defend our intellectual property rights under the respective collaboration agreement and,
although we may have the right to assume the maintenance and defense of our intellectual property rights if our strategic partners do not, our ability to do so may be compromised by our strategic partners acts or omissions.
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Genentech and Debiopharm may utilize our intellectual property rights in such a way as to invite litigation that could jeopardize or invalidate our
intellectual property rights or expose us to potential liability.
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Genentech and Debiopharm may not comply with all applicable regulatory requirements, or fail to report safety data in accordance with all applicable
regulatory requirements.
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | If either Genentech or Debiopharm were to breach or terminate their arrangements with us, the development and commercialization of the affected product
candidate could be delayed, curtailed or terminated because we may not have sufficient financial resources or capabilities to continue development and commercialization of the product candidate on our own.
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Genentech and Debiopharm may not have sufficient resources necessary to carry the product candidate through clinical development or may not obtain the
necessary regulatory approvals.
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

If Genentech or Debiopharm fails to successfully develop and commercialize
our drug candidates under collaboration, we may not be able to develop and commercialize these candidates independently or successfully enter into one or more alternative collaborations, in which event our financial condition, results of operations
and stock price may be adversely affected.

We may not be successful in establishing additional strategic collaborations, which could
adversely affect our ability to develop and commercialize products.

Our current strategy is to seek corporate
collaborators or licensees for the further development and commercialization of one or more drug candidates under our network-targeted cancer drug programs. For example, we expect that in the future we will seek to enter into a corporate
collaboration for CUDC-101, our lead product candidate being developed pursuant to these programs, and CUDC-907, our recently-selected development candidate, and we may seek to partner other drug candidates from these programs in the future. We do
not currently have the experience, resources or capacity to advance these programs into later stages of clinical development or commercialization. As such, our success will depend, in part, on our ability to enter into one or more such
collaborations. We face significant competition in seeking appropriate collaborators and the negotiation process is time-consuming and complex. Moreover, we may not be successful in our efforts to establish a collaboration or other alternative
arrangements for CUDC-101, CUDC-907 or any future programs because our research and development pipeline may be insufficient, our programs may be deemed to be at too early of a stage of development for collaborative effort and/or third parties may
not view our drug candidates and programs as having the requisite potential to demonstrate safety and efficacy or sufficient differentiability compared to existing or emerging treatments. Even if we are successful in our efforts to establish new
collaborations, the terms that we agree upon may not be favorable to us. If we are not able to successfully enter into one or more collaborations or licensing arrangements for CUDC-101, CUDC-907 or any future programs, the clinical development of
these programs could be significantly delayed and, as a result, our future prospects may be adversely affected and our stock price could decline.

Moreover, if we fail to establish and maintain additional strategic partnerships related to our product candidates:



| |  |  | the development of certain of our current or future product candidates may be terminated or delayed;
| | - |  | ----------------------------------------------------------------------------------------------------



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| |  |  | our cash expenditures related to development of certain of our current or future product candidates would increase significantly and we may need to
seek additional financing;
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | we may be required to hire additional employees or otherwise develop expertise, such as sales and marketing expertise, for which we have not budgeted;
and
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | we will bear all of the risk related to the development of any such product candidates.
| | - |  | ---------------------------------------------------------------------------------------

If preclinical studies and clinical trials of our drug candidates are not successful then our future profitability and success could be adversely
affected.

In order to obtain regulatory approval for the commercial sale of our drug candidates, we and any current or
potential future collaborators will be required to complete extensive preclinical studies as well as clinical trials in humans to demonstrate to the FDA and foreign regulatory authorities that our drug candidates are safe and effective. For example,
our lead drug candidate, GDC-0449, is currently being tested by our collaborator, Genentech, in a pivotal phase II clinical trial in advanced BCC and in a phase II clinical trial in operable BCC; and Debiopharm is currently treating patients in a
phase I clinical trial of Debio 0932. In addition, we have initiated a phase Ib expansion trial in CUDC-101 in specific tumor types and we plan to initiate a phase I trial in head and neck cancer of CUDC-101 by the end of the first half of 2011.

Development, including preclinical and clinical testing, is a long, expensive and uncertain process. Preclinical testing and
clinical trials of our drug candidates may not be successful. We and our collaborators could experience delays or failures in preclinical testing or clinical trials of any of our drug candidates for a number of reasons including, for example:



| |  |  | preclinical studies or clinical trials may produce negative, inconsistent or inconclusive results, as occurred in our collaborator Genentechs
recently-completed phase II clinical trials of GDC-0449 in colorectal cancer and ovarian cancer;
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | we or any collaborators may decide, or regulators may require us, to conduct additional preclinical studies or clinical trials or terminate testing for
a particular drug candidate;
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the results from preclinical studies and early clinical trials may not be statistically significant or predictive of results that will be obtained from
expanded, advanced clinical trials;
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | we may encounter difficulties or delays in manufacturing sufficient quantities of the drug candidate used in any preclinical study or clinical trial;
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the timing and completion of clinical trials of our drug candidates depend on, among other factors, the number of patients required to be enrolled in
the clinical trials and the rate at which those patients are enrolled, and any increase in the required number of patients, decrease in recruitment rates or difficulties retaining study participants may result in increased costs, program delays or
program termination;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | our products under development may not be effective in treating any of our network-targeted cancer indications or may prove to have undesirable or
unintended side effects, toxicities or other characteristics that may prevent or limit their commercial use;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | institutional review boards, regulators, including the FDA or its foreign equivalents, or any collaborators may hold, suspend or terminate our clinical
research or the clinical trials of our drug candidates for various reasons, including failure to achieve established success criteria, noncompliance with regulatory requirements or if, in their opinion, the participating subjects are being exposed
to unacceptable health risks; and
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | we, along with any of our current or potential future collaborators and subcontractors, may not employ, in any capacity, persons who have been debarred
under the FDAs Application Integrity Policy, or similar policy under foreign regulatory authorities. Employment of such a debarred person may result in delays in FDAs or foreign equivalents review or approval of our products, or
the rejection of data developed with the involvement of such person(s).
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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If the preclinical studies and/or clinical trials for any of our drug candidates that we
and any collaborators pursue are not successful, then our ability to successfully develop and commercialize products on the basis of the respective technologies will be materially adversely affected, our reputation and our ability to raise
additional capital will be materially impaired and the value of an investment in our stock price is likely to decline.

For a
further discussion of risks relating to the successful clinical development of GDC-0449, see: The successful development of our most advanced product candidate, GDC-0449, is important to our success as a company. GDC-0449 is still in clinical
development. If Genentech does not successfully continue or complete the clinical development of GDC-0449, our ability to earn milestone payments or royalty revenue and our likelihood of success as a company and our ability to finance our operations
will be substantially harmed.

We expect to rely primarily on third parties for the conduct of clinical trials, and if such third
parties perform inadequately then we will not be able to successfully develop and commercialize drug candidates and grow our business.

We have very limited experience in conducting clinical trials. We expect to rely primarily on third parties to conduct our clinical trials and provide services in connection with such clinical trials. For
example, we have granted development and commercialization rights to Genentech and Debiopharm under our existing collaboration agreements with each of them and we expect that any future collaboration partners may similarly be fully responsible for
conducting at least the later-stage clinical trials of drug candidates. In the near term, we expect to rely primarily on third parties such as consultants, contract research organizations and other similar entities to complete IND-enabling
preclinical studies, assist us in creating and submitting IND applications, enroll qualified subjects, conduct our clinical trials and provide services in connection with such clinical trials. Our reliance on these third parties for clinical
development activities will reduce our control over these activities. These third parties may not complete activities on schedule, or at all, or may not conduct our clinical trials in accordance with the clinical trial protocol or design. In
addition, the FDA and its foreign equivalents require us to comply with certain standards, referred to as good clinical practices, and applicable regulatory requirements, for conducting, recording and reporting the results of clinical trials to
assure that data and reported results are credible and accurate and that the rights, integrity and confidentiality of trial participants are protected. Our reliance on third parties that we do not control does not relieve us of these
responsibilities and requirements. If any of the third party contractors on whom we may in the future rely do not comply with good clinical practices or other applicable regulatory requirements, we may not be able to use the data and reported
results from the trial. Any failure by a third party to conduct our clinical trials as planned or in accordance with regulatory requirements could delay or otherwise adversely affect our efforts to obtain regulatory approvals for and commercialize
our drug candidates.

If we and our collaborative partners do not obtain necessary regulatory approvals, then our business will be
unsuccessful and the market price of our common stock could substantially decline.

We and our collaborators will be
required to obtain regulatory approval in order to successfully advance our drug candidates through the clinic and prior to marketing and selling such products. The process of obtaining required regulatory approvals is expensive and the time
required for these approvals is uncertain and typically takes a number of years, depending on the type, complexity and novelty of the product. With respect to our internal programs, we have limited experience in filing and prosecuting applications
to obtain marketing approval.

Any regulatory approval to market a product may be subject to limitations on the approved
indicated uses for which we or our collaborative partners may market the product. These limitations may restrict the size of the market for the product and affect reimbursement by third-party payors. In addition, regulatory agencies may not grant
approvals on a timely basis or may revoke or significantly modify previously granted approvals.

We and our collaborators are
subject to numerous foreign regulatory requirements governing the manufacturing and marketing of our potential future products outside of the United States. The approval



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procedure varies among countries, additional testing may be required in some jurisdictions, and the time required to obtain foreign approvals often differs from that required to obtain FDA
approvals. Moreover, approval by the FDA or a foreign equivalent does not ensure approval by regulatory authorities in other countries, and vice versa.

In addition, regulatory agencies may change existing requirements or adopt new requirements or policies. We and any collaborative partners may be slow to adapt or may not be able to adapt to these changes
or new requirements.

As a result of these factors, we and any collaborators may not successfully begin or complete clinical
trials and/or obtain regulatory approval to market and sell our drug candidates in the time periods estimated, if at all. Moreover, if we or any collaborators incur costs and delays in development programs or fail to successfully develop and
commercialize products based upon our technologies, we may not become profitable and our stock price could decline.

Even if marketing
approval is obtained, any products we or any collaborators develop will be subject to ongoing regulatory oversight, which may affect the successful commercialization of such products.

Even if we or any collaborators obtain regulatory approval of a drug candidate, the approval may be subject to limitations on the approved
indicated uses for which the product is marketed or require costly post-marketing follow-up studies. After marketing approval for any product is obtained, the manufacturer and the manufacturing facilities for that product will be subject to
continual review and periodic inspections by the FDA, or foreign equivalent, and other regulatory agencies. The subsequent discovery of previously unknown problems with the product, or with the manufacturer or facility, or a failure to comply with
regulatory requirements, may result in restrictions on the product or manufacturer, including withdrawal of the product from the market, fines, refusal to approve pending applications or supplements, suspension or withdrawal of regulatory approvals,
product recalls, seizure of products, operating restrictions, refusal to permit the import or export of our products and criminal prosecution.

The FDAs policies may change and additional government regulations may be enacted that could prevent, limit or delay regulatory approval of our product candidates. We cannot predict the likelihood,
nature or extent of government regulation that may arise from future legislation or administrative action, either in the United States or abroad. If we are slow or unable to adapt to changes in existing requirements or the adoption of new
requirements or policies, or if we are not able to maintain regulatory compliance, we may lose any marketing approval that we may have obtained and we may not achieve or sustain profitability, which would adversely affect our business.

We and our current collaborators are, and any potential future collaborators will be, subject to governmental regulations in connection with the
research, development and commercialization of our drug candidates. We and our collaborators may not be able to comply with these regulations, which could subject us or such collaborators to penalties and result in the imposition of limitations on
our or such collaborators operations.

In addition to regulations imposed by the FDA or foreign equivalents, we and
our current collaborators are, and any potential future collaborators will be, subject to regulation under, among other laws, the Occupational Safety and Health Act, the Environmental Protection Act, the Toxic Substances Control Act, the Research
Conservation and Recovery Act, as well as regulations administered by the Nuclear Regulatory Commission, national restrictions on technology transfer, import, export and customs regulations and certain other local, state or federal regulations. From
time to time, other federal agencies and congressional committees have indicated an interest in implementing further regulation of pharmaceutical and biotechnology companies. We are not able to predict whether any such regulations will be adopted or
whether, if adopted, such regulations will apply to our business, or whether we or our collaborators would be able to comply with any applicable regulations.



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Our research and development activities involve the controlled use of hazardous materials
and chemicals. Although we believe that our safety procedures for handling and disposing of such materials comply with all applicable laws and regulations, we cannot completely eliminate the risk of accidental contamination or injury caused by these
materials.

If we or any of our collaborators fail to achieve market acceptance for our products under development, our future revenue and
ability to achieve profitability may be adversely affected.

Our future products, if any are successfully developed, may
not gain commercial acceptance among physicians, patients and third-party payors, even if necessary marketing approvals have been obtained. We believe that recommendations and endorsements by physicians will be essential for market acceptance of any
products we successfully develop. If we are not able to obtain market acceptance for such products, our expected revenues from sales of these products would be adversely affected and our business may not be successful.

RISKS RELATING TO OUR FINANCIAL RESULTS AND NEED FOR FINANCING

We have incurred substantial losses, expect to continue to incur substantial losses for the foreseeable future and may never generate significant revenue or achieve profitability.

As of December 31, 2010, we had an accumulated deficit of approximately $722,229,000. We have not successfully commercialized any
products to date, either alone or in collaboration with others. If we are not able to successfully commercialize any products, we will not achieve profitability. All of our drug candidates are in early stages of development. For the foreseeable
future, we will need to spend significant capital in an effort to develop and commercialize products and we expect to incur substantial operating losses. Our failure to become and remain profitable would, among other things, depress the market price
of our common stock and could impair our ability to raise capital, expand our business, diversify our research and development programs or continue our operations.

We will require substantial additional capital, which is likely to be difficult to obtain.

We will require substantial funds to continue our research and development programs and to fulfill our planned operating goals. In particular, our currently planned operating and capital requirements
include the need for substantial working capital to support our research and development activities for CUDC-101, CUDC-907 and other small molecules that we are seeking to develop from our pipeline of network-targeted cancer programs, and to fund
our general and administrative costs and expenses.

We have historically derived a substantial portion of our operating cash
flow from the research funding portion of collaboration agreements with third parties. However, we have no current research funding revenue under collaboration agreements. Our only potential source of cash flows from operations for the foreseeable
future is contingent payments that we could receive under existing or new collaborations as follows:



| |  |  | up-front license payments and research and development funding that we may receive if we are able to successfully enter into new collaboration
agreements for our technologies under development;
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | contingent cash payments that we may receive for the achievement of development objectives under any new collaborations or our existing collaborations
with Genentech and Debiopharm; and
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | royalty payments that are contingent upon the successful commercialization of products based upon these collaborations.
| | - |  | -----------------------------------------------------------------------------------------------------------------------

We may not be able to successfully enter into or continue any corporate collaborations and the timing, amount and likelihood of us
receiving payments under such collaborations is highly uncertain. As a result, we cannot assure you that we will attain adequate future operating capital, if any, from collaborations or licensing arrangements.



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We anticipate that existing cash, cash equivalents, marketable securities and working
capital at December 31, 2010 should enable us to maintain current and planned operations into the fourth quarter of 2012. Our future capital requirements, however, may vary from what we currently expect. There are a number of factors that may
affect our planned future capital requirements and accelerate our need for additional working capital, many of which are outside our control, including the following:



| |  |  | unanticipated costs in our research and development programs;
| | - |  | -------------------------------------------------------------



| |  |  | the timing and cost of obtaining regulatory approvals for our drug candidates;
| | - |  | ------------------------------------------------------------------------------



| |  |  | the timing, receipt and amount of payments, if any, from current and potential future collaborators;
| | - |  | ----------------------------------------------------------------------------------------------------



| |  |  | the timing and amount of payments due to licensors of patent rights and technology used in our drug candidates;
| | - |  | ---------------------------------------------------------------------------------------------------------------



| |  |  | unplanned costs to prepare, file, prosecute, maintain and enforce patent claims and other patent-related costs, including litigation costs and
technology license fees; and
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | unexpected losses in our cash investments or an inability to otherwise liquidate our cash investments due to unfavorable conditions in the capital
markets.
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------

Additional funds may not be available when we need them, on terms that are acceptable to us, or at
all. If adequate funds are not available to us on a timely basis, we may be required to:



| |  |  | delay, limit, reduce or terminate preclinical studies, clinical trials or other development activities for one or more of our product candidates; or
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | delay, limit, reduce or terminate our establishment of sales and marketing capabilities or other activities that may be necessary to commercialize our
product candidates.
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Raising additional capital may cause dilution to our existing stockholders, restrict our operations
or require us to relinquish rights to our technologies or product candidates.

We may seek additional funding through
public or private financings of debt or equity. The market for emerging life science stocks in general, and the market for our common stock in particular, are highly volatile. Due to this and various other factors, including adverse general market
conditions and the early-stage status of our development pipeline, additional funding may not be available to us on acceptable terms, if at all. In addition, the terms of any financing may be dilutive or otherwise adversely affect other rights of
our stockholders. We also expect to seek additional funds through arrangements with collaborators, licensees or other third parties. These arrangements would generally require us to relinquish or encumber rights to some of our technologies or drug
candidates. Moreover, we may not be able to enter into such arrangements on acceptable terms, if at all. If we are unable to obtain additional funding on a timely basis, whether through sales of debt or equity or through third party collaboration or
license arrangements, we may be required to curtail or terminate some or all of our development programs.

We may face fluctuations in our
operating results from period to period, which may result in a decline in our stock price.

Our operating results have
fluctuated significantly from period to period in the past and may rise or fall significantly from period to period in the future as a result of many factors, including:



| |  |  | the cost of research and development that we engage in;
| | - |  | -------------------------------------------------------



| |  |  | a failure to successfully complete preclinical studies and clinical trials in a timely manner or at all, resulting in a delay in receiving, or a
failure to receive, the required regulatory approvals to commercialize our drug candidates;
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the timing, receipt and amount of payments, if any, from current and potential future collaborators;
| | - |  | ----------------------------------------------------------------------------------------------------



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| |  |  | the entry into, or termination of, collaboration agreements;
| | - |  | ------------------------------------------------------------



| |  |  | the scope, duration and effectiveness of our collaborative arrangements;
| | - |  | ------------------------------------------------------------------------



| |  |  | the costs involved in prosecuting, maintaining and enforcing patent claims;
| | - |  | ---------------------------------------------------------------------------



| |  |  | our ability to operate without infringing upon the proprietary rights of others;
| | - |  | --------------------------------------------------------------------------------



| |  |  | costs to comply with changes in government regulations;
| | - |  | -------------------------------------------------------



| |  |  | changes in management and reductions or additions of personnel;
| | - |  | ---------------------------------------------------------------



| |  |  | general and industry-specific adverse economic conditions that may affect, among other things, our and our collaborators operations and financial
results;
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | changes in accounting estimates, policies or principles, including changes in revenue recognition policies; and
| | - |  | ---------------------------------------------------------------------------------------------------------------



| |  |  | the introduction of competitive products and technologies by third parties.
| | - |  | ---------------------------------------------------------------------------

Due to fluctuations in our operating results, quarterly comparisons of our financial results may not necessarily be meaningful, and
investors should not rely upon such results as an indication of our future performance. In addition, investors may react adversely if our reported operating results are less favorable than in a prior period or are less favorable than those
anticipated by investors or the financial community, which may result in a drop of our stock price.

Unstable market and economic
conditions may have serious adverse consequences on our business, financial condition and stock price.

Our general
business strategy may be adversely affected by unfavorable economic conditions, volatile business environment and continued unpredictable and unstable market conditions. If equity and credit markets are unfavorable, it may make future debt or equity
financing more difficult, more costly, and more dilutive. Failure to secure any necessary financing in a timely manner and on favorable terms could have a material adverse effect on our growth strategy, financial performance and stock price and
could require us to delay or abandon clinical development plans. In addition, there is a risk that one or more of our current service providers, manufacturers and other partners may not survive these difficult economic times, which could directly
affect our ability to attain our operating goals on schedule and on budget.

At December 31, 2010, we had $40,380,000 of
cash, cash equivalents and marketable securities consisting of cash, money market, commercial paper, corporate debt securities, and government obligations. While as of the date of this filing, we are not aware of any downgrades, material losses, or
other significant deterioration in the fair value of our cash equivalents or marketable securities since December 31, 2010, no assurance can be given that further deterioration in conditions of the global credit and financial markets would not
negatively impact our current portfolio of cash equivalents or marketable securities or our ability to meet our financing objectives. Further dislocations in the credit market may adversely impact the value and liquidity of marketable securities
owned by us.

There is a possibility that our stock price may decline due to the volatility of the stock market and the
general economic downturn.

RISKS RELATED TO OUR BUSINESS, INDUSTRY, STRATEGY AND OPERATIONS

We and our collaborators may not achieve projected research and development goals in the time frames that we or they announce, which could have an
adverse impact on our business and could cause our stock price to decline.

We set goals for, and make public statements
regarding, the timing of certain accomplishments, such as the commencement and completion of preclinical studies, initiation and completion of clinical trials, and other



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developments and milestones under our proprietary programs and those programs being developed under collaboration agreements. Genentech has also made public statements regarding its expectations
for the clinical development and potential filing of regulatory submissions for approval of GDC-0449, and may in the future make additional statements about their goals and expectations for this collaboration with us. The actual timing of these
events can vary dramatically due to a number of factors including without limitation delays or failures in our and our current and potential future collaborators preclinical studies or clinical trials, the amount of time, effort and resources
committed to our programs by us and our current and potential future collaborators and the uncertainties inherent in the regulatory approval process. As a result, there can be no assurance that our or our current and potential future
collaborators preclinical studies and clinical trials will advance or be completed in the time frames we or they announce or expect, that we or our current and potential future collaborators will make regulatory submissions or receive
regulatory approvals as planned or that we or our current and potential future collaborators will be able to adhere to our current schedule for the achievement of key milestones under any of our internal or collaborative programs. If we or any
collaborators fail to achieve one or more of these milestones as planned, our business could be materially adversely affected and the price of our common stock could decline.

We face substantial competition, which may result in our competitors discovering, developing or commercializing products before or more successfully than we do.

Our drug candidates face competition from existing and new technologies and products being developed by biotechnology, medical device and
pharmaceutical companies, as well as universities and other research institutions. For example, research in the Hedgehog signaling pathway is highly competitive. We are developing Hedgehog-based therapies under our collaborations with Genentech in
the field of cancer. Competitors may discover, characterize and develop Hedgehog pathway inhibitor drug candidates before we do or may compete with us in the same market sector.

In addition, our small molecule network-targeted cancer drug development candidates, which are focused primarily on validated cancer
targets, face significant competition from marketed drugs and drugs under development that seek to inhibit the same targets as our drug candidates. We expect competition to intensify in cancer generally and, specifically, in targeted approaches to
develop potential cancer therapies as technical advances in the field are made and become more widely known.

Many of our
competitors have substantially greater capital resources, research and development staffs and facilities, and more extensive experience than we have. As a result, efforts by other life science, medical device and pharmaceutical companies could
render our programs or products uneconomical or result in therapies superior to those that we develop alone or with a collaborator.

For those programs that we have selected for internal development, we face competition from companies that are more experienced in product development and commercialization, obtaining regulatory approvals
and product manufacturing. Other smaller companies may also prove to be significant competitors, particularly through collaborative arrangements with large and established companies. As a result, any of these companies may be more successful in
obtaining collaboration agreements or other monetary support, approval and commercialization of their products and/or may develop competing products more rapidly and/or at a lower cost. For those programs that are subject to a collaboration
agreement, competitors may have greater expertise in discovery, research and development, manufacturing, preclinical and clinical testing, obtaining regulatory approvals and marketing than our collaborators and, consequently, may discover, develop
and commercialize products that render our products non-competitive or obsolete.

If we are not able to compete effectively,
then we may not be able, either alone or with others, to advance the development and commercialization of our drug candidates, which would adversely affect our ability to grow our business and become profitable.



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The trend towards consolidation in the pharmaceutical and biotechnology industries may adversely affect
us.

There is a trend towards consolidation in the pharmaceutical and biotechnology industries. This consolidation trend
may result in the remaining companies in these industries having greater financial resources and technological capabilities, thus intensifying competition in these industries. This trend may also result in fewer potential collaborators or licensees
for our therapeutic drug candidates. Also, if a consolidating company is already doing business with our competitors, we may lose existing licensees or collaborators as a result of such consolidation. This trend may adversely affect our ability to
enter into agreements for the development and commercialization of our drug candidates, and as a result may harm our business.

We could be
exposed to significant monetary damages and business harm if we are unable to obtain or maintain adequate product liability insurance at acceptable costs or otherwise protect ourselves against potential product liability claims.

Product liability claims are inherent in the process of researching, developing and commercializing human health care products could
expose us to significant liabilities and prevent or interfere with the development or commercialization of our drug candidates. Regardless of their merit or eventual outcome, product liability claims would require us to spend significant time, money
and other resources to defend such claims, could result in decreased demand for our future products or result in reputational harm and could result in the payment of a significant damage award.

Although we currently have product liability insurance for our phase I clinical trial of CUDC-101, this insurance is subject to
deductibles and coverage limitations and may not be adequate in scope to protect us in the event of a successful product liability claim. If any of our drug candidates advance in clinical trials and/or are approved for marketing, we may seek
additional insurance coverage. Product liability insurance is expensive and may be difficult to procure. As such, it is possible that we will not be able to obtain product liability insurance on acceptable terms, if at all, or that our product
liability insurance coverage will prove to be inadequate to protect us from all potential claims, which may harm our business.

If we are
not able to attract and retain key management and scientific personnel and advisors, we may not successfully develop our drug candidates or achieve our other business objectives.

We depend upon our senior management and scientific staff, including Daniel R. Passeri, our President and Chief Executive Officer, Michael
P. Gray, our Chief Operating Officer and Chief Financial Officer, Changgeng Qian, Ph.D., M.D., our Senior Vice President, Discovery and Preclinical Development and Mitchell Keegan, Ph. D., our Vice-President, Drug Development. The loss of the
service of any of the key members of our senior management may significantly delay or prevent the achievement of product development and other business objectives. Our officers can terminate their employment with us at any time. Replacing key
employees may be difficult and may take an extended period of time because of the limited number of individuals in our industry with the breadth of skills and experience required to research, develop and successfully commercialize products in our
areas of core competency. We do not maintain key man life insurance on any of these executive officers.

Our ability to
operate successfully will depend on our ability to attract and retain qualified personnel, consultants and advisors. We face intense competition for qualified individuals from numerous pharmaceutical and biotechnology companies, universities,
governmental entities and other research institutions. We may be unable to attract and retain these individuals, and our failure to do so would have an adverse effect on our business.

We may seek to acquire complementary businesses and technologies in the future or otherwise seek to expand our operations to grow our business, which may divert management resources and adversely
affect our financial condition and operating results.

We may seek to expand our operations in the future, including
without limitation through internal growth and/or the acquisition of businesses and technologies that we believe are a strategic complement to our business



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model. We may not be able to identify suitable acquisition candidates or expansion strategies and successfully complete such acquisitions or successfully execute any such other expansion
strategies. We may never realize the anticipated benefits of any efforts to expand our business. Furthermore, the expansion of our business, either through internal growth or through acquisitions, poses significant risks to our existing operations,
financial condition and operating results, including:



| |  |  | a diversion of management from our existing operations;
| | - |  | -------------------------------------------------------



| |  |  | increased operating complexity of our business, requiring greater personnel and resources;
| | - |  | ------------------------------------------------------------------------------------------



| |  |  | significant additional cash expenditures to expand our operations and acquire and integrate new businesses and technologies;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------



| |  |  | incurrence of debt, other liabilities and contingent liabilities; and
| | - |  | ---------------------------------------------------------------------



| |  |  | dilutive stock issuances.
| | - |  | -------------------------

Any business that we conduct in China will expose us to the risk of adverse changes in political, legal and economic policies of the Chinese
government, which changes could impede our preclinical efforts in China and materially and adversely affect the development of our network-targeted cancer programs.

We currently engage approximately 25 medicinal chemists in China pursuant to a contract research agreement with a medicinal chemistry provider in China. In addition, we have a subsidiary in China, Curis
Shanghai, which is currently licensed but is not operational.

Conducting business in China exposes us to a variety of risks
and uncertainties that are unique to China. The economy of China has been transitioning from a planned economy to a more market-oriented economy. Although in recent years the Chinese government has implemented measures emphasizing the utilization of
market forces for economic reform, the reduction of state ownership of productive assets and the establishment of sound corporate governance in business enterprises, a substantial portion of productive assets in China is still owned by the Chinese
government. In addition, the Chinese government continues to play a significant role in regulating industrial development. It also exercises significant control over Chinas economic growth through the allocation of resources, controlling
payment of foreign currency-denominated obligations, setting monetary policy and providing preferential treatment to particular industries or companies. Efforts by the Chinese government to slow the pace of growth of the Chinese economy could result
in interruptions of our development efforts in China. If our research and development efforts in China are delayed due to such interruptions, we may not realize the reductions in costs anticipated from engaging chemists in China. We would also have
to consider moving our chemistry and/or biology research that is currently conducted in China to U.S. or European providers, thereby potentially either increasing our overall costs for such services or reducing the total number of chemists and
or/biologists that we could engage.

In addition, the Chinese legal system is a civil law system based on written statutes.
Unlike common law systems, it is a system in which decided legal cases have little precedential value. In 1979, the Chinese government began to promulgate a comprehensive system of laws and regulations governing economic matters in general.
Accordingly, we cannot predict the effect of future developments in the Chinese legal system, including the promulgation of new laws, changes to existing laws or the interpretation or enforcement thereof, or the preemption of local regulations by
national laws. Our business could be materially harmed by any changes in the political, legal or economic climate in China or the inability to enforce applicable Chinese laws and regulations.

If the estimates we make and the assumptions on which we rely in preparing our financial statements prove inaccurate, our actual results may vary significantly.

Our financial statements have been prepared in accordance with accounting principles generally accepted in the United States. The
preparation of these financial statements requires us to make estimates and judgments that affect the reported amounts of our assets, liabilities, revenues and expenses, the amounts of charges taken by us



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and related disclosure. Such estimates and judgments include the carrying value of our property, equipment and intangible assets, revenue recognition, the value of certain liabilities, including
the fair value of our warrant liability, and stock-based compensation expense. We base our estimates and judgments on historical experience and on various other assumptions that we believe to be reasonable under the circumstances. However, these
estimates and judgments, or the assumptions underlying them, may change over time. Accordingly, our actual financial results may vary significantly from the estimates contained in our financial statements.

For a further discussion of the estimates and judgments that we make and the critical accounting policies that affect these estimates and
judgments, see Managements Discussion and Analysis of Financial Condition and Results of OperationsCritical Accounting Policies and Estimates elsewhere in this quarterly report on Form 10-Q.

Our employees may engage in misconduct or other improper activities, including noncompliance with regulatory standards and requirements and insider
trading.

We are exposed to the risk of employee fraud or other misconduct. Misconduct by employees could include
intentional failures to comply with FDA regulations, to provide accurate information to the FDA, to comply with manufacturing standards we have established, to comply with federal and state health-care fraud and abuse laws and regulations, to report
financial information or data accurately or to disclose unauthorized activities to us. Employee misconduct could also involve the improper use of information obtained in the course of clinical trials, which could result in regulatory sanctions and
serious harm to our reputation. We have adopted a Code of Business Conduct and Ethics, but it is not always possible to identify and deter employee misconduct, and the precautions we take to detect and prevent this activity may not be effective in
controlling unknown or unmanaged risks or losses or in protecting us from governmental investigations or other actions or lawsuits stemming from a failure to be in compliance with such laws or regulations.

If any such actions are instituted against us, and we are not successful in defending ourselves or asserting our rights, those actions
could have a significant impact on our business, including the imposition of significant fines or other sanctions. In addition, during the course of our operations, our directors, executives and employees may have access to material, nonpublic
information regarding our business, our results of operations or potential transactions we are considering. Despite our adoption of an Insider Trading Policy, we may not be able to prevent a director, executive or employee from trading in our common
stock on the basis of, or while having access to, material, nonpublic information. If a director, executive or employee was to be investigated, or an action was to be brought against a director, executive or employee for insider trading, it could
have a negative impact on our reputation and our stock price. Such a claim, with or without merit, could also result in substantial expenditures of time and money, and divert attention of our management team from other tasks important to the success
of our business.

RISKS RELATING TO OUR INTELLECTUAL PROPERTY

If we or any of our licensees or assignees breach any of the agreements under which we or they license or transfer our intellectual property to others, we could be deprived of important intellectual
property rights and future revenue.

We are a party to intellectual property out-licenses, collaborations and agreements
that are important to our business, including our June 2003 collaboration agreement with Genentech and our August 2009 license agreement with Debiopharm, and we expect to enter into similar agreements with third parties in the future. Under these
agreements, we generally license or transfer intellectual property to third parties and impose various research, development, commercialization, sublicensing, royalty, indemnification, insurance, and other obligations on them. If a third party
breaches its responsibilities under these agreements, we generally retain the right to terminate the agreement, and to bring a legal action in court or in arbitration. In the event of breach, we may need to enforce our rights under these agreements
by resorting to arbitration or litigation. During the period



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of arbitration or litigation, we may be unable to effectively use, assign or license the relevant intellectual property rights and may be deprived of current or future revenues that are
associated with such intellectual property.

We may not be able to obtain patent protection for our technologies and the patent protection
we do obtain may not be sufficient to stop our competitors from using similar technology.

The patent positions of
pharmaceutical and life science companies, including ours, are generally uncertain and involve complex legal, scientific and factual questions. The procedures and standards that the United States Patent and Trademark Office and various foreign
intellectual property offices use to grant patents, and the standards that courts use to interpret patents, are not always applied predictably or uniformly and may be changed in a significant way and are expected to continue to change. Consequently,
the level of protection, if any, that will be obtained and provided by our patents if we attempt to enforce them, and they are challenged, is uncertain. The long-term success of our business depends in significant part on our ability to:



| |  |  | obtain patents to protect our technologies and discoveries;
| | - |  | -----------------------------------------------------------



| |  |  | protect trade secrets from disclosure to third-party competitors;
| | - |  | -----------------------------------------------------------------



| |  |  | operate without infringing upon the proprietary rights of others; and
| | - |  | ---------------------------------------------------------------------



| |  |  | prevent others from infringing on our proprietary rights.
| | - |  | ---------------------------------------------------------

Patents may not issue from any of the patent applications that we own or license. If patents do issue, the type and extent of patent claims issued to us may not be sufficient to protect our technology
from exploitation by our competitors. In addition, issued patents that we own or license may be challenged, invalidated or circumvented. Our patents also may not afford us protection against competitors with similar technology. Because patent
applications in the United States and abroad are maintained in secrecy until 18 months after filing, it is possible that third parties have filed or maintained patent applications for technology used by us or covered by our pending patent
applications without our knowledge.

We may not have rights under patents that may cover one or more of our drug candidates.
In some cases, these patents may be owned or controlled by third-party competitors and may prevent or impair our ability to exploit our technology. As a result, we or our current or potential future collaborative partners may be required to obtain
licenses under third-party patents to develop and commercialize some of our drug candidates. If we are unable to secure licenses to such patented technology on acceptable terms, we or our collaborative partners may not be able to develop and
commercialize the affected drug candidate or candidates.

We may become involved in expensive and unpredictable patent litigation or other
intellectual property proceedings, which could result in liability for damages or require us to cease our development and commercialization efforts.

There are substantial litigation and other adversarial opposition proceedings regarding patent and other intellectual property rights in the pharmaceutical and life science industries. We may become a
party to patent litigation or other proceedings regarding intellectual property rights.

Situations that may give rise to
patent litigation or other disputes over the use of our intellectual property include:



| |  |  | initiation of litigation or other proceedings against third parties to enforce our patent rights, to seek to invalidate the patents held by these third
parties or to obtain a judgment that our drug candidates do not infringe the third parties patents;
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | participation in interference proceedings to determine the priority of invention if our competitors file U.S. patent applications that claim technology
also claimed by us;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | initiation of foreign opposition proceedings by third parties that seek to limit or eliminate the scope of our patent protection in a foreign
jurisdiction;
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------



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| |  |  | initiation of litigation by third parties claiming that our processes or drug candidates or the intended use of our drug candidates infringe their
patent or other intellectual property rights; and
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | initiation of litigation by us or third parties seeking to enforce contract rights relating to intellectual property that may be important to our
business.
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------

The costs associated with any patent litigation or other proceeding, even if resolved favorably,
will likely be substantial. Some of our competitors may be able to sustain the cost of such litigation or other proceedings more effectively than we can because of their substantially greater financial resources. If a patent litigation or other
intellectual property proceeding is resolved unfavorably, we or any collaborative partners may be enjoined from manufacturing or selling our future products without a license from the other party and be held liable for significant damages. Moreover,
we may not be able to obtain required licenses on commercially acceptable terms or any terms at all. In addition, we could be held liable for lost profits if we are found to have infringed a valid patent, or liable for treble damages if we are found
to have willfully infringed a valid patent. Litigation results are highly unpredictable and we or any collaborative partner may not prevail in any patent litigation or other proceeding in which we may become involved. Any changes in, or unexpected
interpretations of the patent laws may adversely affect our ability to enforce our patent position. Uncertainties resulting from the initiation and continuation of patent litigation or other proceedings could damage our ability to compete in the
marketplace.

We face risks relating to the enforcement of our intellectual property rights in China that could adversely affect our
business.

Pursuant to our contract research agreement with a medicinal chemistry provider in China, we currently engage
approximately 25 medicinal chemists in China to perform drug discovery research and we seek to protect our intellectual property rights under this arrangement through, among other things, non-disclosure and assignment of invention covenants.
Implementation and enforcement of Chinese intellectual property-related laws has historically been inconsistent and damages assessed may fail to reflect the true value of the infringed technology and its market. Accordingly, intellectual property
rights and confidentiality protections in China may not be as effective as in the United States or other countries. Policing unauthorized use of proprietary technology is difficult and expensive, and we might need to resort to litigation to enforce
or defend patents issued to us or to determine the enforceability, scope and validity of our proprietary rights or those of others. The experience and capabilities of Chinese courts in handling intellectual property litigation varies, and outcomes
are unpredictable. Further, such litigation may require significant expenditure of cash and management efforts and could harm our business, financial condition and results of operations. An adverse determination in any such litigation will impair
our intellectual property rights and may harm our business, prospects and reputation.

If we are unable to keep our trade secrets
confidential, our technology and proprietary information may be used by others to compete against us.

We rely
significantly upon proprietary technology, information, processes and know-how that are not subject to patent protection. We seek to protect this information through confidentiality and intellectual property license or assignment provisions in
agreements with our employees, consultants and other third-party contractors, including our contract research agreement with a medicinal chemistry provider in China, as well as through other security measures. The confidentiality and intellectual
property provisions of our agreements and security measures may be breached, and we may not have adequate remedies for any such breach. In addition, our trade secrets may otherwise become known or be independently developed by competitors.

RISKS RELATING TO MANUFACTURING AND SALES

We will depend on collaborators and third-party manufacturers to produce most, if not all, of our products under development, and if these third parties do not successfully formulate or manufacture
these products, our business will be harmed.

We have no manufacturing experience or manufacturing capabilities. In order
to continue to develop drug candidates, apply for regulatory approvals, and commercialize our products under development, we or any



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collaborators must be able to manufacture products in adequate clinical and commercial quantities, in compliance with regulatory requirements, including those related to quality control and
quality assurance, at acceptable costs and in a timely manner. The manufacture of our drug candidates may be complex, difficult to accomplish and difficult to scale-up when large-scale production is required. Manufacture may be subject to delays,
inefficiencies and poor or low yields of quality products. The cost of manufacturing some of our product candidates may make them prohibitively expensive.

To the extent that we or any collaborators seek to enter into manufacturing arrangements with third parties, we and such collaborators will depend upon these third parties to perform their obligations in
a timely and effective manner and in accordance with government regulations. Contract manufacturers may breach their manufacturing agreements because of factors beyond our control or may terminate or fail to renew a manufacturing agreement based on
their own business priorities at a time that is costly or inconvenient for us.

Any contract manufacturers with which we enter
into manufacturing arrangements will be subject to ongoing periodic, unannounced inspection by the FDA and corresponding state and foreign agencies or their designees to ensure strict compliance with current good manufacturing practices and other
governmental regulations and corresponding foreign standards. Any failure by our contract manufacturers, any collaborators or us to comply with applicable regulations could result in sanctions being imposed, including fines, injunctions, civil
penalties, failure of regulatory authorities to grant marketing approval of our drug candidates, delays, suspension or withdrawal of approvals, seizures or recalls of drug candidates, operating restrictions and criminal prosecutions, any of which
could significantly and adversely affect our business. If we need to change manufacturers, the FDA and corresponding foreign regulatory agencies must approve any new manufacturers in advance. This would involve testing and pre-approval inspections
to ensure compliance with FDA and foreign regulations and standards.

If third-party manufacturers fail to perform their
obligations, our competitive position and ability to generate revenue may be adversely affected in a number of ways, including;



| |  |  | we and any collaborators may not be able to initiate or continue certain preclinical and/or clinical trials of products that are under development;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | we and any collaborators may be delayed in submitting applications for regulatory approvals for our drug candidates; and
| | - |  | ------------------------------------------------------------------------------------------------------------------------



| |  |  | we and any collaborators may not be able to meet commercial demands for any approved products.
| | - |  | ----------------------------------------------------------------------------------------------

Because we rely on a limited number of suppliers for the raw materials used in our product candidates, any delay or interruption in the supply of such
raw materials could lead to delays in the manufacture and supply of our product candidates.

We rely on third parties to
supply certain raw materials necessary to produce our drug candidates, including CUDC-101, for preclinical studies and clinical trials. There are a small number of suppliers for certain raw materials that we use to manufacture our drug candidates.
Such suppliers may not sell these raw materials to us at the times we need them or on commercially reasonable terms, or delivery of these raw materials may be delayed or interrupted. Although we generally do not begin a preclinical study or clinical
trial unless we believe we have a sufficient supply of a drug candidate to complete such study or trial, any significant delay in the supply of raw materials for our drug candidates for an ongoing clinical trial due to the need to replace a
third-party supplier could considerably delay completion of certain preclinical studies and/or clinical trials. Moreover, if we were unable to purchase raw materials after regulatory approval had been obtained for our drug candidates, the commercial
launch of our drug candidates would be delayed or there would be a shortage in supply, which would impair our ability to generate revenues from the sale of our drug candidates.



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We have no sales or marketing experience and, as such, plan to depend significantly on third parties who
may not successfully market and sell any products we develop.

We have no sales, marketing or product distribution
experience. If we receive required regulatory approvals, we plan to rely primarily on sales, marketing and distribution arrangements with third parties, including our collaborative partners. For example, as part of our agreements with Genentech and
Debiopharm, we have granted Genentech and Debiopharm the exclusive rights to distribute certain products resulting from such collaborations, if any are ever successfully developed. We may have to enter into additional marketing arrangements in the
future and we may not be able to enter into these additional arrangements on terms that are favorable to us, if at all. In addition, we may have limited or no control over the sales, marketing and distribution activities of these third parties and
sales through these third parties could be less profitable to us than direct sales. These third parties could sell competing products and may devote insufficient sales efforts to our products. Our future revenues will be materially dependent upon
the success of the efforts of these third parties.

We may seek to independently market products that are not already subject
to marketing agreements with other parties. If we determine to perform sales, marketing and distribution functions ourselves, we could face a number of additional risks, including:



| |  |  | we may not be able to attract and build a significant and skilled marketing staff or sales force;
| | - |  | -------------------------------------------------------------------------------------------------



| |  |  | the cost of establishing a marketing staff or sales force may not be justifiable in light of the revenues generated by any particular product; and
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | our direct sales and marketing efforts may not be successful.
| | - |  | -------------------------------------------------------------

Even if we successfully commercialize any products under development, either alone or in collaboration, we face uncertainty with respect to pricing, third-party reimbursement and healthcare reform, all
of which could adversely affect the commercial success of our product candidates.

Our ability to collect significant
revenues from sales of our products, if commercialized successfully, may depend on our ability, and the ability of any current or potential future collaboration partners or customers, to obtain adequate levels of coverage and reimbursement for such
products from third-party payers such as:



| |  |  | government health administration authorities;
| | - |  | ---------------------------------------------



| |  |  | private health insurers;
| | - |  | ------------------------



| |  |  | health maintenance organizations;
| | - |  | ---------------------------------



| |  |  | pharmacy benefit management companies; and
| | - |  | ------------------------------------------



| |  |  | other healthcare-related organizations.
| | - |  | ---------------------------------------

Third party payers are increasingly challenging the prices charged for medical products and services. For example, third-party payers may deny coverage or offer inadequate levels of reimbursement if they
determine that a prescribed product has not received appropriate clearances from the FDA, or foreign equivalent, or other government regulators, is not used in accordance with cost-effective treatment methods as determined by the third-party payer,
or is experimental, unnecessary or inappropriate. Prices could also be driven down by health maintenance organizations that control or significantly influence purchases of healthcare services and products. If third-party payers deny coverage or
offer inadequate levels of reimbursement, we or any collaborators may not be able to market our products effectively or we may be required to offer our products at prices lower than anticipated.

In both the U.S. and some foreign jurisdictions, there have been a number of legislative and regulatory proposals and initiatives to
change the health care system in ways that could affect our ability to sell our products profitably. Some of these proposed and implemented reforms could result in reduced reimbursement rates for our



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potential products, which would adversely affect our business strategy, operations and financial results. For example, in March 2010, President Obama signed into law a legislative overhaul of the
U.S. healthcare system, known as the Patient Protection and Affordable Care Act of 2010, as amended by the Healthcare and Education Affordability Reconciliation Act of 2010, which we refer to as the PPACA. This legislation may have far reaching
consequences for life science companies like us. As a result of this new legislation, substantial changes could be made to the current system for paying for healthcare in the United States, including changes made in order to extend medical benefits
to those who currently lack insurance coverage. Extending coverage to a large population could substantially change the structure of the health insurance system and the methodology for reimbursing medical services, drugs and devices. These
structural changes could entail modifications to the existing system of private payors and government programs, such as Medicare and Medicaid, creation of a government-sponsored healthcare insurance source, or some combination of both, as well as
other changes. Restructuring the coverage of medical care in the United States could impact the reimbursement for prescribed drugs, biopharmaceuticals and medical devices. If reimbursement for our approved product candidates, if any, is
substantially less that we expect in the future, or rebate obligations associated with them are substantially increased, our business could be materially and adversely impacted. In addition, the Medicare Prescription Drug Improvement and
Modernization Act of 2003, or MPDIMA, reformed the way Medicare will cover and reimburse for pharmaceutical products. This legislation could also decrease the coverage and price that we may receive for our approved product candidates, if any.

The cost-containment measures that healthcare providers are instituting and the results of healthcare reforms such as the
PPACA and the MPDIMA may prevent us from maintaining prices for our approved product candidates that are sufficient for us to realize profits and may otherwise significantly harm our business, financial condition and operating results. In addition,
to the extent that our approved product candidates, if any, are marketed outside of the United States, foreign government pricing controls and other regulations may prevent us from maintaining prices for such products that are sufficient for us to
realize profits and may otherwise significantly harm our business, financial condition and operating results.

RISKS RELATED
TO OUR COMMON STOCK

If we fail to meet the requirements for continued listing on the NASDAQ Global Market, our common stock could be
delisted from trading, which would adversely affect the liquidity of our common stock and our ability to raise additional capital.

Our common stock is currently listed for quotation on the NASDAQ Global Market. We are required to meet specified financial requirements in order to maintain our listing on the NASDAQ Global Market. One
such requirement is that we maintain a minimum closing bid price of at least $1.00 per share for our common stock. During 2009, our common stock closed at prices that were below the minimum bid price requirement. If our stock price falls below $1.00
per share for 30 consecutive business days, we will receive a deficiency notice from NASDAQ advising us that we have 180 days to regain compliance by maintaining a minimum bid price of at least $1.00 for a minimum of ten consecutive business days.
Under certain circumstances, NASDAQ could require that the minimum bid price exceed $1.00 for more than ten consecutive days before determining that a company complies with its continued listing standards. If in the future we fail to satisfy the
NASDAQ Global Markets continued listing requirements, our common stock could be delisted from the NASDAQ Global Market, in which case we may transfer to the NASDAQ Capital Market, which generally has lower financial requirements for initial
listing or, if we fail to meet its listing requirements, the OTC Bulletin Board. Any potential delisting of our common stock from the NASDAQ Global Market would make it more difficult for our stockholders to sell our stock in the public market and
would likely result in decreased liquidity and increased volatility for our common stock.



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Our stock price may fluctuate significantly and the market price of our common stock could drop below
the price paid.

The trading price of our common stock has been volatile and may continue to be volatile in the future. For
example, our stock traded within a range of a high price of $3.70 and a low price of $0.68 per share for the period January 1, 2008 through March 3, 2011. The stock market, particularly in recent years, has experienced significant
volatility with respect to pharmaceutical and biotechnology company stocks. Prices for our stock will be determined in the marketplace and may be influenced by many factors, including:



| |  |  | announcements regarding new technologies by us or our competitors;
| | - |  | ------------------------------------------------------------------



| |  |  | market conditions in the biotechnology and pharmaceutical sectors;
| | - |  | ------------------------------------------------------------------



| |  |  | rumors relating to us or our competitors;
| | - |  | -----------------------------------------



| |  |  | litigation or public concern about the safety of our potential products;
| | - |  | ------------------------------------------------------------------------



| |  |  | actual or anticipated variations in our quarterly operating results and any subsequent restatement of such results;
| | - |  | -------------------------------------------------------------------------------------------------------------------



| |  |  | actual or anticipated changes to our research and development plans;
| | - |  | --------------------------------------------------------------------



| |  |  | deviations in our operating results from the estimates of securities analysts;
| | - |  | ------------------------------------------------------------------------------



| |  |  | entering into new collaboration agreements or termination of existing collaboration agreements;
| | - |  | -----------------------------------------------------------------------------------------------



| |  |  | adverse results or delays in clinical trials being conducted by us or any collaborators, as was seen with our recent announcement of Genentechs
unfavorable results in its phase II clinical trials for GDC-0449 in colorectal cancer and ovarian cancer;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | any intellectual property or other lawsuits involving us;
| | - |  | ---------------------------------------------------------



| |  |  | third-party sales of large blocks of our common stock;
| | - |  | ------------------------------------------------------



| |  |  | sales of our common stock by our executive officers, directors or significant stockholders;
| | - |  | -------------------------------------------------------------------------------------------



| |  |  | equity sales by us of our common stock to fund our operations;
| | - |  | --------------------------------------------------------------



| |  |  | the loss of any of our key scientific or management personnel;
| | - |  | --------------------------------------------------------------



| |  |  | FDA or international regulatory actions; and
| | - |  | --------------------------------------------



| |  |  | general economic and market conditions, including recent adverse changes in the domestic and international financial markets.
| | - |  | -----------------------------------------------------------------------------------------------------------------------------

While we cannot predict the individual effect that these factors may have on the price of our common stock,
these factors, either individually or in the aggregate, could result in significant variations in price during any given period of time. Moreover, in the past, securities class action litigation has often been instituted against companies following
periods of volatility in their stock price. This type of litigation could result in substantial costs and divert our managements attention and resources.

The limited liquidity for our common stock could affect an investors ability to sell our shares at a satisfactory price and makes the trading price of our common stock more volatile.

Our common stock is relatively illiquid. As of December 31, 2010, we had approximately 75.8 million shares of
common stock outstanding. The average daily trading volume in our common stock during the prior 90 trading days ending on December 31, 2010 was approximately 276,000 shares. A more active public market for our common stock may not develop,
which would continue to adversely affect the trading price and liquidity of our common stock. Moreover, common stock with a thin trading market may experience greater price fluctuation than the stock market as a whole. Without a large float, our
common stock is less liquid than the stock of companies with broader public ownership and, as a result, the trading prices of our common stock may be more volatile.



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Future sales of shares of our common stock, including shares issued upon the exercise of currently
outstanding options and warrants or pursuant to our universal shelf registration statement could negatively affect our stock price.

Most of our outstanding common stock can be traded without restriction at any time. As such, sales of a substantial number of shares of our common stock in the public market could occur at any time. These
sales, or the perception in the market that the holders of a large number of shares intend to sell such shares, could reduce the market price of our common stock. In addition, we have a significant number of shares that are subject to outstanding
options and warrants. The exercise of these options and warrants and the subsequent sale of the underlying common stock could cause a further decline in our stock price. These sales also might make it difficult for us to sell equity securities in
the future at a time and at a price that we deem appropriate.

We currently have on file with the SEC a universal
shelf registration statement which allows us to offer and sell registered common stock, preferred stock and warrants from time to time pursuant to one or more offerings at prices and terms to be determined at the time of sale. Sales of substantial
amounts of shares of our common stock or other securities under this registration statement could lower the market price of our common stock and impair our ability to raise capital through the sale of equity securities. Moreover, in the future, we
may issue additional options, warrants or other derivative securities convertible into our common stock.

We do not intend to pay dividends
on our common stock, and any return to investors will come, if at all, only from potential increases in the price of our common stock.

At the present time, we intend to use available funds to finance our operations. Accordingly, while payment of dividends rests within the discretion of our board of directors, no common stock dividends
have been declared or paid by us and we have no intention of paying any common stock dividends in the foreseeable future.

Insiders have
substantial control over us and could delay or prevent a change in corporate control.

As of December 31, 2010, we
believe that our directors, executive officers and principal stockholders, together with their affiliates, owned, in the aggregate, approximately 29% of our outstanding common stock. As a result, these stockholders, if acting together, will be able
to exert influence over the management and affairs of our company and over matters requiring stockholder approval, including the election of directors and approval of significant corporate transactions. This concentration of ownership
could harm the market price of our common stock by:



| |  |  | delaying, deferring or preventing a change in control of our company;
| | - |  | ---------------------------------------------------------------------



| |  |  | impeding a merger, consolidation, takeover or other business combination involving our company; or
| | - |  | --------------------------------------------------------------------------------------------------



| |  |  | discouraging a potential acquirer from making a tender offer or otherwise attempting to obtain control of our company.
| | - |  | ----------------------------------------------------------------------------------------------------------------------

We have anti-takeover defenses that could delay or prevent an acquisition that our stockholders may consider favorable and the market price of our
common stock may be lower as a result.

Provisions of our certificate of incorporation, our bylaws and Delaware law may
have the effect of deterring unsolicited takeovers or delaying or preventing changes in control of our management, including transactions in which our stockholders might otherwise receive a premium for their shares over then current market prices.
In addition, these provisions may limit the ability of stockholders to approve transactions that they may deem to be in their best interest. For example, we have divided our board of directors into three classes that serve staggered three-year
terms, we may issue shares of our authorized blank check preferred stock and our stockholders are limited in their ability to call special stockholder meetings.

In addition, we are subject to the anti-takeover provisions of Section 203 of the Delaware General Corporation Law, which prohibits a publicly-held Delaware corporation from engaging in a business



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combination with an interested stockholder, generally a person which together with its affiliates owns, or within the last three years has owned, 15% of our voting stock, for a period of three
years after the date of the transaction in which the person became an interested stockholder, unless the business combination is approved in a prescribed manner. These provisions could discourage, delay or prevent a change in control transaction.



|ITEM 1B. | UNRESOLVED STAFF COMMENTS
|-------- | -------------------------

None.



|ITEM 2. | PROPERTIES
|------- | ----------

We currently
lease a facility for our administrative, research and development requirements located at 4 Maguire Road in Lexington, Massachusetts consisting of 24,529 square feet pursuant to a lease that expires February 2018. We believe that our existing
facility will be suitable and adequate to meet our needs for the foreseeable future.



|ITEM 3. | LEGAL PROCEEDINGS
|------- | -----------------

We are
currently not a party to any material legal proceedings.



|ITEM 4. | REMOVED AND RESERVED
|------- | --------------------



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EXECUTIVE OFFICERS OF THE REGISTRANT

Our executive officers are as follows:



|                              |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |  |                                                                
|----------------------------- |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | ---------------------------------------------------------------
|Name                          |  | Age                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |  | Position                                                       
|Daniel R. Passeri, MSc., J.D. |  | 50                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |  | President and Chief Executive Officer                          
|                              |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Michael P. Gray               |  | 40                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |  | Chief Operating Officer and Chief Financial Officer            
|                              |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Mitchell Keegan, Ph.D.        |  | 39                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |  | Vice President, Development                                    
|                              |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Mark W. Noel                  |  | 52                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |  | Vice President, Technology Management and Intellectual Property
|                              |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Changgeng Qian, Ph.D., M.D.   |  | 55                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |  | Senior Vice President, Discovery and Preclinical Research      
|                              | 
|Daniel R. Passeri, MSc., J.D. |  | Mr. Passeri has served as our President and Chief Executive Officer and as a director since September 2001. From November 2000 to September 2001,
Mr. Passeri served as Senior Vice President, Corporate Development and Strategic Planning of the Company. From March 1997 to November 2000, Mr. Passeri was employed by GeneLogic Inc., a biotechnology company, most recently as Senior Vice
President, Corporate Development and Strategic Planning. From February 1995 to March 1997, Mr. Passeri was employed by Boehringer Mannheim, a pharmaceutical, biotechnology and diagnostic company, as Director of Technology Management.
Mr. Passeri is a graduate of the National Law Center at George Washington University, with a J.D., of the Imperial College of Science, Technology and Medicine at the University of London, with an M.Sc. in biotechnology, and of Northeastern
University, with a B.S. in biology.
|                              | 
|Michael P. Gray               |  | Mr. Gray has served as our Chief Operating Officer and Chief Financial Officer since December 2006. From December 2003 until December 2006, Mr. Gray served as
our Vice President of Finance and Chief Financial Officer and served as our Senior Director of Finance and Controller from August 2000 until December 2003. From January 1998 to July 2000, Mr. Gray was Controller at Reprogenesis, Inc., a
predecessor biotechnology company. Mr. Gray previously served as an audit professional for the accounting and consulting firm of Ernst & Young, LLP. Mr. Gray is a certified public accountant, holds an M.B.A. from the F.W. Olin
Graduate School of Business at Babson College, and has a B.S. in accounting from Bryant College.                                                                                                                                                                              
|                              | 
|Mitchell Keegan, Ph.D.        |  | Dr. Keegan has served as our Vice President, Drug Development since September 2009. From April 2008 until September 2009, Dr. Keegan served as our Executive
Director, Drug Development. From April 2005 to March 2008, Dr. Keegan was employed by Gloucester Pharmaceuticals, Inc., a biotechnology company, as Senior Director, Drug Development. From December 2001 to April 2005, Dr. Keegan was employed by
CombinatoRx, Incorporated, a biotechnology company, where from December 2001 to December 2003 he                                                                                                                                                                                                                                                                                                                                                                                                            



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|                            |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |  |         
|--------------------------- |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | --------
|Name                        |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |  | Position
|                            |  | served as Team Leader, Pharmacology and from December 2003 to April 2005 as Director, Pharmacology. From January 2001 to December 2001, Dr. Keegan worked as a Study
Director, employed by Toxikon Corporation, a life science company and contract research organization. From October 1998 to January 2001, Dr Keegan served as Research Fellow in Medicine at Harvard Medical School/Joslin Diabetes Center. Dr. Keegan
holds a Ph.D. from the University of Western Sydney, Australia and a B.S (Hons) from the University of Sydney, Australia.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|                            | 
|Mark W. Noel                |  | Mr. Noel has served as our Vice President, Technology Management and Intellectual Property since September 2008. From March 2001 until September 2008,
Mr. Noel has served as our Vice President, Technology Management and Business Development. From March 2000 to February 2001, Mr. Noel was employed by GeneLogic, as Vice President of Customer Relations. From January 1998 to February 2000,
Mr. Noel was employed by GeneLogic as Senior Director of Program Management. From December 1993 to January 1998, Mr. Noel was employed by the U.S. Department of Human Services National Cancer Institute Office of Technology Development (now
the NCI Technology Transfer Center), where from July 1997 to January 1998, he served as Acting Deputy Director. From February 1989 to November 1993, Mr. Noel worked as a patent agent at Gist Brocades NV, a supplier of ingredients to the
pharmaceutical and food sectors. Mr. Noel holds a B.S. from the University of Maryland.                                                                                                                                            
|                            | 
|Changgeng Qian, Ph.D., M.D. |  | Dr. Qian has served as our Senior Vice President, Discovery and Preclinical Research since February 2010. From September 2006 until February 2010, Dr. Qian
served as our Vice President, Discovery and Preclinical Research, and from May 2005 to September 2006, Dr. Qian served as our Senior Director, Pharmacology. From May 2002 to May 2005, Dr. Qian served as our Director, Pharmacology, and from
May 2001 to May 2002, Dr. Qian served as our Associate Director, Pharmacology. From November 1999 to May 2001, Dr. Qian was Senior Scientist II at Millennium Pharmaceuticals, Inc., a biopharmaceutical company. From October 1996 to November
1999, Dr. Qian was Senior Research Scientist III at LeukoSite, Inc., a biopharmaceutical company that was acquired by Millennium Pharmaceuticals in December 1999. From January 1992 to December 1995, Dr. Qian was Head of Pharmacology at
CytoMed, Inc., a biopharmaceutical company. Dr. Qian holds a Ph.D. in Pharmacology and an M.D. from the Hunan Medical University in Changsha, China and has served as a professor of the Hunan Medical University since
1992.



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PART II



|ITEM 5. | MARKET FOR REGISTRANTS COMMON EQUITY, RELATED STOCKHOLDERS MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES
|------- | -------------------------------------------------------------------------------------------------------------

(a) Market Information.    Our common stock is traded on the NASDAQ Global Market under the trading symbol
CRIS. The following table sets forth, for the fiscal periods indicated, the high and low sales prices per share of our common stock as reported on the NASDAQ Global Market:



|                             |  |                   |      |  |     |   |      | 
|---------------------------- |  | ----------------- | ---- |  | --- | - | ---- | 
|                             |  | CurisCommon Stock |     
|Year ended December 31, 2009 |  | High              |      |  | Low |  
|First Quarter                |  | $                 | 1.41 |  |     | $ | 0.74 | 
|Second Quarter               |  | $                 | 1.82 |  |     | $ | 1.11 | 
|Third Quarter                |  | $                 | 2.61 |  |     | $ | 1.28 | 
|Fourth Quarter               |  | $                 | 3.68 |  |     | $ | 1.93 | 
|                             |  |                  
|Year ended December 31, 2010 |  |                   |      |  |     |  
|First Quarter                |  | $                 | 3.70 |  |     | $ | 2.05 | 
|Second Quarter               |  | $                 | 3.58 |  |     | $ | 1.38 | 
|Third Quarter                |  | $                 | 1.87 |  |     | $ | 1.21 | 
|Fourth Quarter               |  | $                 | 2.14 |  |     | $ | 1.28 | 

(b)
Holders.    On March 3, 2011, the last reported sale price of our common stock on the NASDAQ Global Market was $3.00 and there were 278 holders of record of our common stock. The number of record holders may not be
representative of the number of beneficial owners because many of the shares of our common stock are held by depositories, brokers or other nominees.

(c) Dividends.    We have never declared or paid any cash dividends on our common stock. We currently intend to retain earnings, if any, to support our business strategy and do
not anticipate paying cash dividends in the foreseeable future. Payment of future dividends, if any, will be at the sole discretion of our board of directors after taking into account various factors, including our financial condition, operating
results, capital requirements and any plans for expansion.



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(e) Performance Graph.    The graph below compares the
cumulative total stockholder return on our common stock for the period from December 31, 2005 through December 31, 2010, with the cumulative total return on (i) NASDAQ Pharmaceutical Index, (ii) NASDAQ Market IndexU.S.
Companies and (iii) NASDAQ Biotechnology Index. The comparison assumes investment of $100 on December 31, 2005 in our common stock and in each of the indices and, in each case, assumes reinvestment of all dividends.

LOGO



|                              |  |          |        |  |          |  |        |          |  |  |          |  |  |          |       |  |          |  |        |  |  |  |        | 
|----------------------------- |  | -------- | ------ |  | -------- |  | ------ | -------- |  |  | -------- |  |  | -------- | ----- |  | -------- |  | ------ |  |  |  | ------ | 
|                              |  | 12/31/05 |        |  | 12/31/06 |  |        | 12/31/07 |  |  | 12/31/08 |  |  | 12/31/09 |       |  | 12/31/10 | 
|CURIS INC.                    |  |          | 100.00 |  |          |  | 35.39  |          |  |  | 27.53    |  |  |          | 21.07 |  |          |  | 91.29  |  |  |  | 55.62  | 
|NASDAQ PHARMACEUTICAL INDEX   |  |          | 100.00 |  |          |  | 111.74 |          |  |  | 124.67   |  |  |          | 73.77 |  |          |  | 107.12 |  |  |  | 125.93 | 
|NASDAQ MARKET INDEX-U.S. COS. |  |          | 100.00 |  |          |  | 101.61 |          |  |  | 94.58    |  |  |          | 87.40 |  |          |  | 95.29  |  |  |  | 101.44 | 
|NASDAQ BIOTECHNOLOGY INDEX    |  |          | 100.00 |  |          |  | 99.71  |          |  |  | 103.09   |  |  |          | 96.34 |  |          |  | 106.49 |  |  |  | 114.80 | 



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|ITEM 6. | SELECTED FINANCIAL DATA
|------- | -----------------------

The selected consolidated financial data set forth below have been derived from our consolidated financial statements. These historical
results are not necessarily indicative of results to be expected for any future period. You should read the data set forth below in conjunction with Managements Discussion and Analysis of Financial Condition and Results of
Operations and the consolidated financial statements and related notes included elsewhere in this report.



|                                                   |  |                                       |          |   |      |   |          |      |  |   |          |   |  |      |          |   |  |   |          |  
|-------------------------------------------------- |  | ------------------------------------- | -------- | - | ---- | - | -------- | ---- |  | - | -------- | - |  | ---- | -------- | - |  | - | -------- | -
|                                                   |  | Year Ended December 31,               |         
|                                                   |  | 2010                                  |          |   | 2009 |   |          | 2008 |  |   | 2007     |   |  | 2006 |         
|                                                   |  | (in thousands, except per share data) |         
|Consolidated Statement of Operations Data:         |  |                                       |          |   |      |   |          |      |  |   |          |   |  |      |          |   |  |   |          |  
|Revenues:                                          |  |                                       |          |   |      |   |          |      |  |   |          |   |  |      |          |   |  |   |          |  
|Research and development                           |  | $                                     | 344      |   |      | $ | 781      |      |  | $ | 514      |   |  | $    | 3,262    |   |  | $ | 9,340    |  
|License and maintenance fees(1)                    |  |                                       | 15,656   |   |      |   | 7,809    |      |  |   | 7,853    |   |  |      | 13,127   |   |  |   | 4,324    |  
|Substantive milestones(2)                          |  |                                       |         |   |      |   |         |      |  |   |         |   |  |      |         |   |  |   | 3,000    |  
|Contra-revenues                                    |  |                                       |         |   |      |   |         |      |  |   |         |   |  |      |         |   |  |   | (1,728   | )
|                                                   |  |                                       |          |   |      |   |          |      |  |   |          |   |  |      |          |   |  |   |          |  
|Net revenues                                       |  |                                       | 16,000   |   |      |   | 8,590    |      |  |   | 8,367    |   |  |      | 16,389   |   |  |   | 14,936   |  
|                                                   |  |                                       |          |   |      |   |          |      |  |   |          |   |  |      |          |   |  |   |          |  
|Costs and expenses:                                |  |                                       |          |   |      |   |          |      |  |   |          |   |  |      |          |   |  |   |          |  
|Research and development                           |  |                                       | 11,373   |   |      |   | 9,933    |      |  |   | 13,226   |   |  |      | 14,779   |   |  |   | 14,590   |  
|General and administrative                         |  |                                       | 10,265   |   |      |   | 8,702    |      |  |   | 8,260    |   |  |      | 9,984    |   |  |   | 10,374   |  
|Amortization of intangible assets                  |  |                                       |         |   |      |   |         |      |  |   |         |   |  |      |         |   |  |   | 27       |  
|                                                   |  |                                       |          |   |      |   |          |      |  |   |          |   |  |      |          |   |  |   |          |  
|Total costs and expenses                           |  |                                       | 21,638   |   |      |   | 18,635   |      |  |   | 21,486   |   |  |      | 24,763   |   |  |   | 24,991   |  
|                                                   |  |                                       |          |   |      |   |          |      |  |   |          |   |  |      |          |   |  |   |          |  
|Loss from operations                               |  |                                       | (5,638   | ) |      |   | (10,045  | )    |  |   | (13,119  | ) |  |      | (8,374   | ) |  |   | (10,055  | )
|                                                   |  |                                       |          |   |      |   |          |      |  |   |          |   |  |      |          |   |  |   |          |  
|Other income (expense):                            |  |                                       |          |   |      |   |          |      |  |   |          |   |  |      |          |   |  |   |          |  
|Interest and other income                          |  |                                       | 627      |   |      |   | 222      |      |  |   | 1,000    |   |  |      | 1,495    |   |  |   | 1,422    |  
|Change in fair value of warrants                   |  |                                       | 576      |   |      |   |         |      |  |   |         |   |  |      |         |   |  |   |         |  
|Interest expense                                   |  |                                       |         |   |      |   |         |      |  |   | (4       | ) |  |      | (85      | ) |  |   | (196     | )
|                                                   |  |                                       |          |   |      |   |          |      |  |   |          |   |  |      |          |   |  |   |          |  
|Total other income, net                            |  |                                       | 1,203    |   |      |   | 222      |      |  |   | 996      |   |  |      | 1,410    |   |  |   | 1,226    |  
|                                                   |  |                                       |          |   |      |   |          |      |  |   |          |   |  |      |          |   |  |   |          |  
|Net loss                                           |  | $                                     | (4,435   | ) |      | $ | (9,823   | )    |  | $ | (12,123  | ) |  | $    | (6,964   | ) |  | $ | (8,829   | )
|                                                   |  |                                       |          |   |      |   |          |      |  |   |          |   |  |      |          |   |  |   |          |  
|Basic and diluted net loss per common share        |  | $                                     | (0.06    | ) |      | $ | (0.15    | )    |  | $ | (0.19    | ) |  | $    | (0.13    | ) |  | $ | (0.18    | )
|                                                   |  |                                       |          |   |      |   |          |      |  |   |          |   |  |      |          |   |  |   |          |  
|Weighted average common shares (basic and diluted) |  |                                       | 74,959   |   |      |   | 65,061   |      |  |   | 63,378   |   |  |      | 54,915   |   |  |   | 49,067   |  
|                                                   |  |                                       |          |   |      |   |          |      |  |   |          |   |  |      |          |   |  |   |          |  
|                                                   | 
|                                                   |  | (in thousands)As of December 31,      |         
|                                                   |  | 2010                                  |          |   | 2009 |   |          | 2008 |  |   | 2007     |   |  | 2006 |         
|Consolidated Balance Sheet Data:                   |  |                                       |          |   |      |   |          |      |  |   |          |   |  |      |          |   |  |   |          |  
|Cash, cash equivalents and marketable securities   |  | $                                     | 40,380   |   |      | $ | 25,035   |      |  | $ | 28,853   |   |  | $    | 41,459   |   |  | $ | 36,656   |  
|Working capital                                    |  |                                       | 37,608   |   |      |   | 23,347   |      |  |   | 26,748   |   |  |      | 35,410   |   |  |   | 32,521   |  
|Investmentrestricted                              |  |                                       | 497      |   |      |   | 216      |      |  |   | 210      |   |  |      | 210      |   |  |   | 202      |  
|Total assets                                       |  |                                       | 50,649   |   |      |   | 36,099   |      |  |   | 39,982   |   |  |      | 53,817   |   |  |   | 52,268   |  
|Long-term obligations                              |  |                                       | 1,656    |   |      |   |         |      |  |   |         |   |  |      | 404      |   |  |   | 1,980    |  
|Accumulated deficit                                |  |                                       | (722,229 | ) |      |   | (717,793 | )    |  |   | (707,971 | ) |  |      | (695,848 | ) |  |   | (688,883 | )
|Total stockholders equity                         |  |                                       | 45,518   |   |      |   | 33,052   |      |  |   | 37,225   |   |  |      | 46,845   |   |  |   | 35,897   |  



|(1) | During the year ended December 31, 2010, we recognized $11,000,000 of revenue for contingent cash payments that we earned under our August 2009 license agreement
with Debiopharm, and we also recognized $4,000,000 in settlement proceeds from Micromet pursuant to the settlement agreement that we entered into in February 2010 to resolve a contract claim we filed related to our June 2001 agreement with Micromet.
During the years ended December 31, 2009 and 2008, we recognized $6,000,000 of revenue for contingent cash payments that we earned during each of 2009 and 2008 under our June 2003 Hedgehog pathway inhibitor collaboration with Genentech. During
the year ended December 31, 2007, we recognized $10,509,000 of revenue under this collaboration, which included $7,509,000 in previously deferred revenue and $3,000,000 for a contingent cash payment that we earned during 2007.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(2) | During the year ended December 31, 2006, we recognized $3,000,000 as substantive milestone revenue under our June 2003 Hedgehog pathway inhibitor collaboration
with Genentech.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(3) | Long-term obligations for the year ended December 31, 2010 are comprised of a warrant liability established as part of our January 2010 registered direct offering
of $1,605,000 with the remainder related to deferred rent payments. Long-term obligations for the years ended December 31, 2007 and 2006 related to long-term debt payments.
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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|ITEM 7. | MANAGEMENTS DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
|------- | -------------------------------------------------------------------------------------

The following discussion and analysis of financial condition and results of operations should be read together with Selected
Financial Data, and our financial statements and accompanying notes appearing elsewhere in this annual report on Form 10-K. This discussion contains forward-looking statements, based on current expectations and related to future events and our
future financial performance, that involve risks and uncertainties. Our actual results may differ materially from those anticipated in these forward-looking statements as a result of many important factors, including those set forth under
Item 1A, Risk Factors and elsewhere in this report.

Overview

We are a drug discovery and development company that is committed to leveraging our innovative signaling pathway drug technologies in
seeking to develop next generation network-targeted cancer therapies. We are building upon our experience in modulating signaling pathways, including the Hedgehog signaling pathway, in our effort to develop network-targeted cancer therapies. We
conduct our research and development programs both internally and through strategic collaborations.

Hedgehog Pathway
Inhibitor Program

GDC-0449.Our most advanced program is our Hedgehog pathway inhibitor
program under collaboration with Genentech, Inc., a member of the Roche Group. The lead drug candidate being developed under this program is GDC-0449, a first-in-class orally-administered small molecule Hedgehog pathway inhibitor.

The Hedgehog signaling pathway plays an important role in regulating proper growth and development in the early stages of life and
becomes less active in adults. However, mutations in the pathway can occur and reactivate Hedgehog signaling that may lead to different types of cancer. Mutations that lead to overactive signaling in the Hedgehog pathway are implicated in the
majority of basal cell carcinoma, or BCC.

Genentech and Roche are currently conducting two clinical trials of GDC-0449
in BCC patient populations, including a pivotal phase II trial in advanced BCC and a phase II clinical trial of GDC-0449 for patients with operable nodular BCC. Advanced BCC is a severe form of the disease that includes cutaneous BCCs that are
considered inoperable by the treating physician as well as BCCs that have metastasized to other tissues and organs. In February 2009, Genentech initiated the pivotal phase II clinical trial of GDC-0449, in which approximately 100 patients with
locally advanced or metastatic BCC are being evaluated in a single-arm, two-cohort global clinical trial. One cohort includes all patients with histologically-confirmed, measurable metastatic BCC. The second cohort includes histologically-confirmed
locally advanced BCC that is considered inoperable by the treating physician. All patients receive a daily oral dose of GDC-0449. The primary endpoint in the advanced BBC study is to measure the rate of patient response to GDC-0449 therapy. Roche
has stated that it expects top-line results from this study in the first quarter of 2011 and, if study results are favorable, that it anticipates making at least the first regulatory submission for GDC-0449 in 2011. Assuming that submissions are
filed by Roche and accepted by the applicable regulatory agencies, we will be eligible to receive milestone payments for the U.S. and Europe territories. Genentech initiated the phase II operable BCC clinical trial in October 2010. This trial
is designed to test GDC-0449 as a single-agent therapy in approximately 50 patients with operable nodular BCC in a US-based, open label, two-cohort clinical trial. All patients will receive a 150 mg daily oral dose of GDC-0449 for 12 weeks. The
primary outcome measure for the first cohort is the rate of complete histological clearance of the target nodular BCC lesions at the time of tumor excision (which may occur up to 12 weeks following initiation of treatment) while the primary
outcome measure for the second cohort is the rate of durable complete clearance of target nodular BCC lesions at the time of excision (which may occur up to 36 weeks following initiation of treatment).

In addition to the BCC clinical trials being conducted directly by Genentech and Roche, GDC-0449 is also currently being tested in other
cancers in trials under collaborative agreements between Genentech and either



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third-party investigators or the U.S. National Cancer Institute, or NCI, including in medulloblastoma, sarcoma and glioblastoma multiforme, as well as in pancreatic, small cell lung,
gastroesophageal junction, gastric, breast, and prostate cancers, among others.

Genentech completed two Phase II clinical
trials of GDC-0449 in 2010, including in advanced ovarian cancer and metastatic colorectal cancer. Neither of these studies met their primary endpoints of demonstrating a clinically meaningful extension of progression-free survival and Genentech has
determined that it will not pursue further development in these two indications.

Network-Targeted Cancer Programs

Our internal drug development efforts are focused on our network-targeted cancer programs, in which we are seeking to
design single novel small molecule drug candidates that inhibit multiple signaling pathways that are believed to play roles in cancer cell proliferation. We refer to this approach as cancer network disruption and believe that our approach of
targeting multiple nodes in cancer signaling pathway networks may provide a better therapeutic effect than many of the cancer drugs currently marketed or in development since our drug candidates are being designed to disrupt the cancer network
environment in several additional important targets when compared to most other cancer drugs.

CUDC-101.Our lead candidate from these programs is CUDC-101, a first-in-class small
molecule compound designed to simultaneously target histone deacetylase, or HDAC, epidermal growth factor receptor, or EGFR, and human epidermal growth factor receptor 2, or Her2, all of which are validated cancer targets. A significant amount of
our internal resources are focused on the ongoing clinical development of this molecule. To date, we have completed a phase I dose escalation clinical trial of this molecule in 25 patients with advanced, refractory solid tumors and initiated a phase
Ib expansion trial to test CUDC-101 in approximately 50 patients with specific tumor types, including head and neck, non-small cell lung, breast, gastric and liver cancers. We expect to complete enrollment in the phase Ib study in mid-2011 and to
report full data from this study during the second half of 2011. The phase Ib expansion trial is designed as an open-label study in which patients are treated with CUDC-101 at the maximum tolerated dose, which was determined in the phase I dose
escalation study to be 275 milligrams per meter2. The
primary objectives of this study are to compare the safety and tolerability of CUDC-101 in subjects with these specific advanced solid tumors when the drug is administered either on a five days per week schedule (one week on/one week off) or on a
three days per week schedule (three weeks on/one week off).

We also anticipate initiating a phase I clinical trial of
CUDC-101 in advanced head and neck cancer patients whose cancer is human papilloma virus, or HPV, negative during the first half of 2011. The primary objective of this study is to evaluate the safety and tolerability of CUDC-101 when
administered in combination with the current standard-of-care of cisplatin, a chemotherapeutic drug, and radiation. Upon determination of the maximum tolerated dose and assuming the otherwise successful completion of the phase I trial, we
intend to conduct a randomized phase II two-arm clinical trial in which head and neck cancer patients will receive cisplatin and radiation plus or minus CUDC-101. The phase II study would seek to evaluate whether the addition of CUDC-101 can
improve the efficacy and durability of cisplatin and radiation therapy in this patient population.

We are also working on an
oral formulation of CUDC-101, which we believe will make CUDC-101 more competitive in certain cancers such as non-small cell lung cancer where patients are generally on therapy for several months and there are competing commercially-available
molecules that are orally administered. Pending the successful completion of ongoing formulation and preclinical development work, we intend to file the appropriate regulatory documents for use of an oral formulation of CUDC-101 in clinical trials
in late 2011.

CUDC-907.    In January 2011, we selected development candidate CUDC-907, an orally
bioavailable, network-targeted small molecule that is designed to inhibit HDAC and phosphatidylinositol-3-kinase, or PI3K. Our scientists are developing CUDC-907 based on published and internally generated data demonstrating that



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HDAC and PI3K inhibitors have synergistic interaction against cancer cells. We believe that this synergistic mechanism of cancer signaling network disruption, which demonstrated efficacy and a
favorable safety profile in a number of preclinical xenograft models, could translate into clinical advantages over single agents. Pending the successful completion of ongoing formulation and preclinical development work, we expect to file an
investigational new drug application, or IND, with the US Food and Drug Administration, or FDA, for an oral formulation of CUDC-907 late in 2011.

In addition to our development-stage programs, we continue to progress additional proprietary preclinical research programs and expect that we will select additional small molecule inhibitors from our
preclinical portfolio in the future.

Hsp90 Program

Debio 0932.Our heat shock protein 90, or Hsp90, program is being developed by Debiopharm, a Swiss
pharmaceutical development company, under an August 2009 license agreement between Curis and Debiopharm. The lead molecule under this license collaboration was designated Debio 0932 by Debiopharm. In April 2010, Debiopharm treated the first patient
in a phase I clinical trial to evaluate the safety of Debio 0932 in patients suffering from advanced solid tumors or lymphoma.

Liquidity

Since our inception, we have funded our operations primarily through license fees, contingent cash payments, research and development funding from our corporate collaborators, the private and public
placement of our equity securities and debt financings and the monetization of certain royalty rights. We have never been profitable and have an accumulated deficit of $722,229,000 as of December 31, 2010. We expect to incur significant
operating losses for the next several years as we devote substantially all of our resources to our research and development programs. We will need to generate significant revenues to achieve profitability and do not expect to achieve profitability
in the foreseeable future, if at all. We believe that near term key drivers to our success will include:



| |  |  | Genentechs ability to continue to successfully advance its clinical trials for GDC-0449, including its pivotal phase II trial in advanced BCC;
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Debiopharms ability to successfully complete its ongoing phase I clinical testing and advance Debio 0932 into later stages of clinical
development;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | our ability to continue to successfully enroll and treat patients in our phase Ib clinical trial for CUDC-101;
| | - |  | --------------------------------------------------------------------------------------------------------------



| |  |  | our ability to successfully initiate and complete a phase I clinical trial for CUDC-101 in combination with radiation and cisplatin in head and neck
cancer patients;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | our ability to successfully advance development candidates CUDC-907 and CUDC-101 (oral formulation) through formulation and manufacturing processes and
IND-enabling studies and successfully initiate phase I testing for these candidates;
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | our ability to successfully enter into a material license or collaboration agreement for CUDC-101 or other of our proprietary drug candidates; and
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | our ability to advance the research of other small molecule cancer drug candidates that we are developing under our proprietary pipeline of
network-targeted cancer programs.
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------

In the longer term, a key driver to our success will be our ability, and
the ability of any current or future collaborator or licensee, to successfully commercialize drugs based upon our proprietary technologies.



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Collaboration Agreements

We are currently a party to a June 2003 collaboration with Genentech relating to our Hedgehog pathway inhibitor technologies, and an August 2009 license agreement with Debiopharm relating to our Hsp90
inhibitor technology. Our past and current collaborations have generally provided for research, development and commercialization programs to be wholly or majority-funded by our collaborators and provide us with the opportunity to receive additional
contingent cash payments if specified development and regulatory approval objectives are achieved, as well as royalty payments upon the successful commercialization of any products based upon the collaborations. We are currently not receiving any
research funding and we do not expect to receive such funding in the future from Genentech or Debiopharm under our current agreements with these parties. We currently expect to incur only nominal research and development costs under our
collaborations with Genentech related to the maintenance of licenses. In addition, as a result of our licensing agreements with various universities, we are obligated to make payments to these university licensors when we receive certain payments
from Genentech. As of December 31, 2010, we have paid an aggregate of $900,000 related to such agreements. We also expect to incur general and administrative costs associated with our share of intellectual property costs under our June 2003
collaboration with Genentech. We do not expect to incur any material costs related to our Hsp90 technologies under development by Debiopharm under our August 2009 license agreement with Debiopharm.

Our current collaboration agreements are summarized as follows:

Genentech Hedgehog Pathway Inhibitor Collaboration.Under the terms of the June 2003 agreement with Genentech, we granted Genentech an exclusive, global, royalty-bearing
license, with the right to sublicense, to make, use, sell and import small molecule and antibody Hedgehog pathway inhibitors. In November 2008, Genentech granted a sublicense to F. Hoffmann-LaRoche, Ltd (Roche) for non-U.S. rights to
GDC-0449. Roche received this sublicense pursuant to an agreement between Genentech and Roche under which Genentech granted Roche an option to obtain a license to commercialize certain Genentech products in non-U.S. markets. In February 2010, we
announced that Chugai Pharmaceutical Co., Ltd. had exercised its right of first refusal for the development and commercialization in Japan of GDC-0449 under an existing agreement with Roche. Genentech and Roche have primary responsibility for
worldwide clinical development, regulatory affairs, manufacturing and supply, formulation and sales and marketing. We are not a party to this agreement between Genentech and Roche but we are eligible to receive cash payments for regulatory filing
and approval objectives achieved and future royalties on products developed outside of the U.S., if any, under our June 2003 collaboration agreement with Genentech.

The lead drug candidate being developed under our Hedgehog pathway inhibitor collaboration with Genentech is GDC-0449, a first-in-class orally-administered small molecule Hedgehog pathway inhibitor.
Genentech and Roche are responsible for worldwide clinical development, regulatory affairs, manufacturing and supply, formulation and sales and marketing. We are eligible to receive cash payments for regulatory filing and approval objectives
achieved and future royalties on products developed outside of the U.S., if any, under our June 2003 collaboration agreement with Genentech. We are eligible to receive up to $115,000,000 in contingent cash payments under the terms of our June 2003
collaboration for the development of GDC-0449 or another small molecule, assuming the successful achievement by Genentech and Roche of specified clinical development and regulatory objectives. We have received $18,000,000 of this amount to date. We
are also eligible to receive royalties on sales of any Hedgehog pathway inhibitor products that are successfully commercialized by Genentech and Roche. For GDC-0449, we are entitled to a mid-to-high single digit royalty, which escalates within this
range with increasing product sales. In certain specified circumstances, the royalty rate applicable to GDC-0449 may be decreased to a low-to-mid single digit royalty.

Debiopharm Hsp90 Collaboration.In August 2009, we granted a worldwide, exclusive royalty-bearing license to our Hsp90 inhibitor technology to Debiopharm, a Swiss
pharmaceutical development company. The lead molecule under this license collaboration was designated Debio 0932 by Debiopharm. Debiopharm has assumed all future development responsibility and costs related to the development, registration and
commercialization of products under the agreement. As part of the consideration under the agreement,



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Debiopharm paid us an up-front license fee of $2,000,000, and we received $11,000,000 during 2010 in contingent payments upon Debiopharms successful achievement of clinical objectives,
including the approval from French regulatory authorities of Debiopharms clinical trial application, or CTA, to begin phase I clinical trials and the treatment of the fifth patient in this trial. We are also eligible to receive royalties if
any products under the license agreement are successfully developed and commercialized. For net sales of Debio 0932 that are made directly by Debiopharm, we are entitled to a high single digit to low double digit royalty, which escalates within this
range with increasing product sales. In certain specified circumstances, the royalty rate applicable to Debio 0932 may be reduced. We believe that it is more likely that Debiopharm will sublicense Debio 0932 following its further development, and in
this case we are entitled to a share of royalties that Debiopharm receives from such sublicensee.

Financial Operations Overview

General.    Our future operating results will largely depend on the magnitude of payments from
our current and potential future corporate collaborators and the progress of drug candidates currently in our research and development pipeline. The results of our operations will vary significantly from year to year and quarter to quarter and
depend on, among other factors, the timing of our entry into new collaborations, if any, the timing of the receipt of payments, if any, from new or existing collaborators and the cost and outcome of any preclinical development or clinical trials
then being conducted. We anticipate that existing capital resources as of December 31, 2010 should enable us to maintain current and planned operations into the fourth quarter of 2012. Our ability to continue funding our planned operations
beyond the fourth quarter of 2012 is dependent on future contingent payments that we may receive from Debiopharm or Genentech upon the achievement of development and regulatory approval objectives, our ability to manage our expenses and our ability
to raise additional funds through additional corporate collaborations, equity or debt financings, or from other sources of financing.

We expect to end 2011 with cash, cash equivalents and marketable securities of $18 million to $22 million, excluding any potential payments received from existing or new collaborators. We expect that our
expenses associated with the clinical development of CUDC-101 will increase as we continue to treat patients in our phase Ib trial and initiate a phase I trial in head and neck cancers, resulting in an overall increase in our research and
development expenses for future periods as compared to prior years. We expect that research and development expenses for the year ended December 31, 2011 will be $13 million to $16 million and that general and administrative expenses will be $7
million to $8 million. These expense estimates include $500,000 and $1.0 million of stock-based compensation expense for research and development and general and administrative expense, respectively, which includes employee and director equity
grants issued in January 2011. Actual stock-based compensation expense for fiscal 2011 may be higher as the result of our issuance of additional awards as part of our planned compensation programs, consistent with past practices.

Revenue.    We do not expect to generate any revenue from our direct sale of products for several years, if
ever. Substantially all of our revenues to date have been derived from license fees, research and development payments, and other amounts that we have received from our strategic collaborators and licensees. For the year ended December 31,
2010, each of the following parties accounted for a portion of our total revenue as follows: Debiopharm, $11,333,000, or 71%; and Micromet settlement proceeds, $4,000,000, or 25%.

We currently receive no research funding for our programs under our collaborations with Genentech and Debiopharm and we do not expect to
receive such funding in the future under these collaborations. Accordingly, our only source of revenues and/or cash flows from operations for the foreseeable future will be up-front license payments and funded research and development that we may
receive under new collaboration agreements, if any, contingent cash payments for the achievement of clinical development and regulatory objectives, if any are met, under new collaborations or our existing collaborations with Genentech and
Debiopharm, and royalty payments that are contingent upon the successful commercialization of any products based upon these collaborations. Our ability to enter into new collaborations and our receipt of additional payments under our existing
collaborations with Genentech and Debiopharm cannot be assured, nor can we predict the timing of any such arrangements or payments, as the case may be.



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Research and Development.    Research and development expense
consists of costs incurred to discover, research and develop our drug candidates. These expenses consist primarily of salaries and related expenses for personnel including stock-based compensation expense as well as outside service costs including
clinical research organizations, medicinal chemistry and sublicense payments. Research and development expenses also include the costs of supplies and reagents, consulting, and occupancy and depreciation charges. We expense research and development
costs as incurred. We are currently incurring only nominal research and development expenses under our Hedgehog pathway inhibitor collaboration with Genentech related to the maintenance of third-party licenses to certain background technologies. For
each contingent payment, if any, received under the Hedgehog pathway inhibitor collaboration, we would be obligated to make payments to certain third-party licensors and recognize the related expense.

Our research and development programs, both internal and under collaboration, are summarized in the following table:



|                                                                  |  |                                   |  |                       |  |                          
|----------------------------------------------------------------- |  | --------------------------------- |  | --------------------- |  | -------------------------
|Product Candidate                                                 |  | Primary Disease                   |  | Collaborator/Licensee |  | Status                   
|Hedgehog Pathway Inhibitor                                        |  |                                   |  |                       |  |                          
|-   GDC-0449
-   GDC-0449                                         |  | Advanced BCC Operable
Nodular BCC |  | Genentech
Genentech   |  | Pivotal phase II Phase
II
|                                                                  |  |                                   | 
|Netowrk-targeted cancer programs                                  |  |                                   |  |                       |  |                          
|-   CUDC-101 intravenous formulation (HDAC, EGFR, Her2 inhibitor) |  | Cancer                            |  | Internal development  |  | Phase Ib                 
|-   CUDC-101 oral formulation (HDAC, EGFR, Her2 inhibitor)        |  | Cancer                            |  | Internal development  |  | Development candidate    
|-   CUDC-907 (HDAC, PI3K inhibitor)                               |  | Cancer                            |  | Internal development  |  | Development candidate    
|-   Other network-targeted cancer programs                        |  | Cancer                            |  | Internal development  |  | Preclinical              
|-   Debio 0932 (formerly CUDC-305) (Hsp90 inhibitor)              |  | Cancer                            |  | Debiopharm            |  | Phase I                  

In the chart above, pivotal
phase II means that Genentech is currently treating human patients in a pivotal phase II clinical trial, the primary objective of which is a therapeutic response in human patients. Genentech and Roche have indicated that the outcomes of this
clinical trial, if positive, may serve as the basis for regulatory submissions in 2011. Phase II means that Genentech is currently treating human patients in a phase II clinical trial, the primary objective of which is a therapeutic
response in the patient population. Phase Ib means that we are currently treating human patients with specific tumor types in an extension of our phase I dose escalation trial, at the maximum tolerated dose from such trial, the principal
purpose of which is to evaluate the safety and tolerability of the compound being tested. Phase I means that Debiopharm is currently treating human patients in a phase I clinical trial, the principal purpose of which is to evaluate the
safety and tolerability of the compound being tested. Development candidate means that from our testing in several preclinical models of human disease of various compounds from a particular compound class, we have selected a single lead
candidate for potential future clinical development and are seeking to complete the relevant safety, toxicology, and other data required to submit an investigational new drug, or IND, application with the FDA seeking to commence a phase I clinical
trial. Preclinical means that we are seeking to obtain evidence of therapeutic efficacy and safety in preclinical models of human disease of one or more compounds within a particular class of drug candidates.

Because of the early stages of development of these programs, our ability and that of our collaborators and licensees to successfully
complete preclinical studies and clinical trials of these drug candidates, and the timing of completion of such programs, is highly uncertain. There are numerous risks and uncertainties associated with developing drugs which may affect our and our
collaborators future results, including:



| |  |  | the scope, quality of data, rate of progress and cost of clinical trials and other research and development activities undertaken by us or our
collaborators;
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the results of future preclinical studies and clinical trials;
| | - |  | --------------------------------------------------------------



| |  |  | the cost and timing of regulatory approvals;
| | - |  | --------------------------------------------



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| |  |  | the cost and timing of establishing sales, marketing and distribution capabilities;
| | - |  | -----------------------------------------------------------------------------------



| |  |  | the cost of establishing clinical and commercial supplies of our drug candidates and any products that we may develop;
| | - |  | ----------------------------------------------------------------------------------------------------------------------



| |  |  | the effect of competing technological and market developments; and
| | - |  | ------------------------------------------------------------------



| |  |  | the cost and effectiveness of filing, prosecuting, defending and enforcing any patent claims and other intellectual property rights.
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------

We cannot reasonably estimate or know the nature, timing and estimated costs of the efforts necessary to
complete the development of, or the period in which material net cash inflows are expected to commence from any of our drug candidates. Any failure to complete the development of our drug candidates in a timely manner could have a material adverse
effect on our operations, financial position and liquidity.

A further discussion of some of the risks and uncertainties
associated with completing our research and development programs on schedule, or at all, and some consequences of failing to do so, are set forth above in Part I, Item 1ARisk Factors.

General and Administrative.    General and administrative expense consists primarily of salaries, stock-based
compensation expense and other related costs for personnel in executive, finance, accounting, business development, legal, information technology, corporate communications and human resource functions. Other costs include facility costs not
otherwise included in research and development expense, insurance, and professional fees for legal, patent and accounting services. Patent costs include certain patents covered under collaborations, a portion of which is reimbursed by collaborators
and a portion of which is borne by us. We incurred what we expect to be significant general and administrative expenses in 2009 and 2010, specifically as it related to an arbitration proceeding that we initiated against a former collaborator. We
entered into a settlement and release agreement with this former collaborator in February 2010, whereby a final payment of $4,000,000 was paid to us in order to settle the dispute and discharge and terminate all future payment obligations that would
have arisen under the June 2001 collaboration agreement. During 2010, we incurred approximately $1,500,000 in legal fees and expenses through the settlement date. We do not expect that we will incur such fees in 2011 and, accordingly, anticipate
that our general and administrative expenses will decline in 2011 as compared to 2010.

Critical Accounting Policies and Estimates

The preparation of our consolidated financial statements in conformity with accounting principles generally accepted in
the United States requires that we make estimates and assumptions that affect the reported amounts and disclosure of certain assets and liabilities at our balance sheet date. Such estimates and judgments include the carrying value of property and
equipment and intangible assets, revenue recognition, the value of certain liabilities, including our warrant liability, and stock-based compensation. We base our estimates on historical experience and on various other factors that we believe to be
appropriate under the circumstances, the results of which form the basis for making judgments about the carrying value of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under
different assumptions or conditions.

While our significant accounting policies are more fully described in our consolidated
financial statements, we believe that the following accounting policies are critical to understanding the judgments and estimates we use in preparing our financial statements:

Revenue Recognition

Our business strategy includes entering into
collaborative license and development agreements with biotechnology and pharmaceutical companies for the development and commercialization of our product



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candidates. The terms of the agreements typically include non-refundable license fees, funding of research and development, payments based upon achievement of clinical development milestones and
royalties on product sales. We follow the provisions of the Financial Accounting Standards Board, or FASB, Codification Topic 605, Revenue Recognition.

License Fees and Multiple Element Arrangements.    In January 2010, we adopted a new U.S. GAAP accounting standard which amends existing revenue recognition accounting guidance
to provide accounting principles and application guidance on whether multiple deliverables exist, how the arrangement should be separated, and the consideration allocated. This new guidance eliminates the requirement to establish objective evidence
of fair value of undelivered products and services and instead provides for separate revenue recognition based upon managements estimate of the selling price for an undelivered item when there is no vendor-specific objective evidence or
third-party evidence to determine the fair value of that undelivered item. Because we did not enter into any new multiple element arrangements or modify our existing collaborations during the year ended December 31, 2010, recognition models
used to derive our revenues for the year ended December 31, 2010 reflect the superseded guidance and the adoption of the new standard will be implemented on a prospective basis for new or materially modified arrangements.

For multiple element arrangements, including license agreements, entered into prior to January 1, 2010, guidance required that the
fair value of the undelivered item be the price of the item either sold in a separate transaction between unrelated third parties or the price charged for each item when the item is sold separately by the vendor. This was difficult to determine when
the product was not individually sold because of its unique features. Under this guidance, if the fair value of all of the undelivered elements in the arrangement was not determinable, then revenue was deferred until all of the items were delivered
or fair value was determined.

Non-refundable license fees are recognized as revenue when we have a contractual right to
receive such payment, the contract price is fixed or determinable, the collection of the resulting receivable is reasonably assured and we have no further performance obligations under the license agreement. Multiple element arrangements, such as
license and development arrangements are analyzed to determine whether the deliverables, which often include a license and performance obligations such as research and steering committee services, can be separated or whether they must be accounted
for as a single unit of accounting in accordance with U.S. generally accepted accounting principles, or GAAP. We recognize up-front license payments as revenue upon delivery of the license only if the license has stand-alone value and the fair value
of the undelivered performance obligations, typically including research and/or steering committee services, can be determined. If the fair value of the undelivered performance obligations can be determined, such obligations would then be accounted
for separately as performed. If the license is considered to either (i) not have stand-alone value or (ii) have stand-alone value but the fair value of any of the undelivered performance obligations cannot be determined, the arrangement
would then be accounted for as a single unit of accounting and the license payments and payments for performance obligations are recognized as revenue over the estimated period of when the performance obligations are performed.

Whenever we determine that an arrangement should be accounted for as a single unit of accounting, we must determine the period over which
the performance obligations will be performed and revenue will be recognized. Revenue will be recognized using either a relative performance or straight-line method. We recognize revenue using the relative performance method provided that we can
reasonably estimate the level of effort required to complete our performance obligations under an arrangement and such performance obligations are provided on a best-efforts basis. Direct labor hours or full-time equivalents are typically used as
the measure of performance. Revenue recognized under the relative performance method would be determined by multiplying the total payments under the contract, excluding royalties and payments contingent upon achievement of substantive milestones, by
the ratio of level of effort incurred to date to estimated total level of effort required to complete our performance obligations under the arrangement. Revenue is limited to the lesser of the cumulative amount of payments received or the cumulative
amount of revenue earned, as determined using the relative performance method, as of each reporting period.



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If we cannot reasonably estimate the level of effort required to complete our performance
obligations under an arrangement, the performance obligations are provided on a best-efforts basis and we can reasonably estimate when the performance obligation ceases or becomes inconsequential, then the total payments under the arrangement,
excluding royalties and payments contingent upon achievement of substantive milestones, would be recognized as revenue on a straight-line basis over the period we expect to complete our performance obligations. Revenue is limited to the lesser of
the cumulative amount of payments received or the cumulative amount of revenue earned, as determined using the straight-line basis, as of the period ending date.

If we cannot reasonably estimate when our performance obligation either ceases or becomes inconsequential and perfunctory, then revenue is deferred until we can reasonably estimate when the performance
obligation ceases or becomes inconsequential and perfunctory. Revenue is then recognized over the remaining estimated period of performance.

In addition, if we are involved in a steering committee as part of a multiple element arrangement that is accounted for as a single unit of accounting, we assess whether our involvement constitutes a
performance obligation or a right to participate. Steering committee services that are not inconsequential or perfunctory and that are determined to be performance obligations are combined with other research services or performance obligations
required under an arrangement, if any, in determining the level of effort required in an arrangement and the period over which we expect to complete our aggregate performance obligations.

Substantive Milestone Payments.Our collaboration agreements may also contain substantive milestone
payments. Substantive milestone payments are recognized upon achievement of the milestone only if all of the following conditions are met:



| |  |  | the milestone payments are non-refundable;
| | - |  | ------------------------------------------



| |  |  | achievement of the milestone involves a degree of risk and was not reasonably assured at the inception of the arrangement;
| | - |  | --------------------------------------------------------------------------------------------------------------------------



| |  |  | substantive effort on our part is involved in achieving the milestone;
| | - |  | ----------------------------------------------------------------------



| |  |  | the amount of the milestone payment is reasonable in relation to the effort expended or the risk associated with achievement of the milestone; and,
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | a reasonable amount of time passes between the up-front license payment and the first milestone payment as well as between each subsequent milestone
payment.
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------

Determination as to whether a payment meets the aforementioned conditions involves
managements judgment. If any of these conditions are not met, the resulting payment would not be considered a substantive milestone, and therefore the resulting payment would be considered part of the consideration for the single unit of
accounting and be recognized as revenue as such performance obligations are performed under either the relative performance or straight-line methods, as applicable, and in accordance with these policies as described above. In addition, the
determination that one such payment was not a substantive milestone could prevent us from concluding that subsequent milestone payments were substantive milestones and, as a result, any additional milestone payments could also be considered part of
the consideration for the single unit of accounting and would be recognized as revenue as such performance obligations are performed under either the relative performance or straight-line methods, as applicable. Milestones that are tied to
regulatory approval are not considered probable of being achieved until such approval is received. Milestones tied to counter-party performance are not included in our revenue model until the performance conditions are met.

Reimbursement of Costs.    Reimbursement of research and development costs by third party collaborators is
recognized as revenue provided the provisions of FASB Codification Topic 605-45, Revenue Recognition, Principal Agent Consideration,are met, the amounts are determinable, and collection of the related receivable is reasonably assured.



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Royalty Revenue.    We will recognize royalty revenue, if any,
based upon actual and estimated net sales by the licensee of licensed products in licensed territories, and in the period the sales occur. We have not recognized any royalty revenue to date.

Deferred Revenue.    Amounts received prior to satisfying the above revenue recognition criteria are recorded
as deferred revenue in the accompanying consolidated balance sheets. Significant judgments are required in the application of revenue recognition guidance. For example, in connection with our existing and former collaboration agreements, we have
historically recorded on our balance sheet short- and long-term deferred revenue based on our best estimate of when such revenue would be recognized. Short-term deferred revenue would consist of amounts that are expected to be recognized as
revenue, or applied against future co-development costs, within the next fiscal year. Amounts that we expect will not be recognized in the next fiscal year would be classified as long-term deferred revenue. However, this estimate would be based on
our operating plan as of the balance sheet date and on our estimated performance periods under the collaboration in which we have recorded deferred revenues. If our operating plan or our estimated performance period would change, we could recognize
a different amount of deferred revenue over the reporting period.

With respect to each of the foregoing areas of revenue
recognition, we exercise significant judgment in determining whether an arrangement contains multiple elements, and, if so, how much revenue is allocable to each element. In addition, we exercise our judgment in determining when our significant
obligations have been met under such agreements and the specific time periods over which we recognized revenue, such as non-refundable, up-front license fees. To the extent that actual facts and circumstances differ from our initial judgments, our
revenue recognition with respect to such transactions would change accordingly and any such change could affect our reported operating results. To the extent that actual facts and circumstances differ from our initial judgments, our revenue
recognition with respect to such arrangement would change accordingly and any such change could affect our reported financial results.

Stock-based Compensation

Effective January 1, 2006, we adopted Statement of Financial Accounting Standards, or SFAS, No. 123(revised 2004), Share-Based Payment,which generally requires that such transactions be
accounted for using a fair-value-based method and is now referred to as FASB Codification Topic 718, CompensationStock Compensation.

We have recorded employee and director stock-based compensation expense of $1,979,000, $1,750,000 and $2,182,000 for the years ended December 31, 2010, 2009 and 2008, respectively. We estimate that
we will record approximately $1,500,000, in stock-based compensation expense in 2011. We have granted and expect that we may grant additional options in 2011 that could increase the amount of stock-based compensation ultimately recognized. The
amount of the incremental employee stock-based compensation expense attributable to 2011 employee stock options to be granted will depend primarily on the number of stock options granted, the fair market value of our common stock at the respective
grant dates, and the specific terms of the stock options.

We measure compensation cost for share-based compensation at fair
value, including estimated forfeitures, and recognize the expense as compensation expense over the period that the recipient is required to provide service in exchange for the award, which generally is the vesting period. We use the Black-Scholes
option pricing model to measure the fair value of stock options. This model requires significant estimates related to the awards expected life and future stock price volatility of the underlying equity security. In determining the amount of
expense to be recorded, we also are required to estimate forfeiture rates for awards, based on the probability that employees will complete the required service period. We estimate the forfeiture rate based on historical experience. If actual
forfeitures differ significantly from our estimates, additional adjustments to compensation expense may be required in future periods. Ultimately, the actual expense recognized over the vesting period will only be for those shares that vest.



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Fair Value Measurements

Effective January 1, 2008, we adopted the provisions of SFAS No. 157, Fair Value Measurements for our
financial assets and financial liabilities, which is now referred to as FASB Codification Topic 820, Fair Value Measurements and Disclosures. Topic 820 provides a framework for measuring fair value under GAAP and requires expanded disclosures
regarding fair value measurements. GAAP defines fair value as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an
orderly transaction between market participants on the measurement date. Market participants are buyers and sellers in the principal market that are (i) independent, (ii) knowledgeable, (iii) able to transact, and (iv) willing to
transact.

GAAP requires the use of valuation techniques that are consistent with the market approach, the income approach
and/or the cost approach. The market approach uses prices and other relevant information generated by market transactions involving identical or comparable assets and liabilities. The income approach uses valuation techniques to convert future
amounts, such as cash flows or earnings, to a single present amount on a discounted basis. The cost approach is based on the amount that currently would be required to replace the service capacity of an asset (replacement cost). Valuation techniques
should be consistently applied. GAAP also establishes a fair value hierarchy which requires an entity to maximize the use of observable inputs, where available, and minimize the use of unobservable inputs when measuring fair value. The standard
describes three levels of inputs that may be used to measure fair value:



|        |  |                                                                                                                                                                                                                                                                                                       
|------- |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|Level 1 |  | Quoted prices in active markets for identical assets or liabilities.                                                                                                                                                                                                                                  
|        | 
|Level 2 |  | Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are
observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.
|        | 
|Level 3 |  | Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.                                                                                                                                                       

Our cash equivalents and marketable securities have been classified as Level 1 assets. We do not hold any asset-backed or auction rate
securities. Short-term accounts receivable and accounts payable are reflected in the consolidated financial statements at net realizable value, which approximates fair value due to the short-term nature of these instruments. As of December 31,
2010, we do not hold any Level 2 assets or liabilities.

In 2010, we completed a registered direct offering in which we issued
warrants to purchase shares of our common stock. The warrants include certain protective features for the benefit of the warrantholder, including an exercise price adjustment clause and a possible cash-settlement option in the event of a change of
control until the later to occur of (i) two years from the date of original issuance of the warrant and (ii) the date upon which Genentech or Roche submits a new drug application (NDA) for GDC-0449. Due to these terms, the warrants were
deemed to be a liability. We estimate the fair value of the warrants using a Black-Scholes option pricing model under various probability-weighted outcomes which take into consideration the protective, but limited, cash-settlement feature of the
warrants. In using this model, the fair value is determined by applying Level 3 inputs, which include assumptions around the estimated future stock price of our common stock and varying probabilities that certain events will occur. Significant
increases or decreases in any of these assumptions would materially impact the fair value of the warrants and our financial statements. The warrants will be revalued each reporting period with updated assumptions, and the resulting change in fair
value of the warrant liability will be recognized in our financial statements.

While we believe our valuation methodologies
are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different estimate of fair value at the reporting date.



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Long-lived Assets

Long-lived assets consist primarily of property and equipment and goodwill. Property and equipment is stated at cost and depreciated over the estimated useful lives of the related assets using the
straight-line method. Determining the economic lives of property and equipment requires us to make significant judgments that can materially impact our operating results. If it were determined that the carrying value of our other long-lived assets
might not be recoverable based upon the existence of one or more indicators of impairment, we would measure an impairment based on application of FASB Codification Topic 360-10-05, Impairment or Disposal of Long-Lived Assets.

We evaluate our goodwill for impairment at least annually or more frequently if an indicator of potential impairment exists. In
performing our evaluations of impairment, we determine fair value using widely accepted valuation techniques, including discounted cash flows. These calculations contain uncertainties as they require us to make assumptions related to future cash
flows, projected useful lives of assets and the appropriate discount rate to reflect the risk inherent in future cash flows. We must also make assumptions regarding industry economic factors and the profitability of future business strategies. If
actual results are not consistent with our estimates and assumptions used in estimating future cash flows and asset fair values, we may be exposed to a material impairment charge. As a single reporting unit, we completed our annual goodwill
impairment tests in December 2010, 2009 and 2008, and determined that as of those dates our fair value exceeded the carrying value of our net assets. Accordingly, no goodwill impairment was recognized in 2010, 2009 and 2008.

Our discussion of our critical accounting policies is not intended to be a comprehensive discussion of all of our accounting policies. In
many cases, the accounting treatment of a particular transaction is specifically dictated by generally accepted accounting principles, with no need for managements judgment in their application. There are also areas in which managements
judgment in selecting any available alternative would not produce a materially different result.

Results of Operations

Years Ended December 31, 2010 and 2009

Revenues

Total revenues are summarized as follows:



|                         |  |                                |            |  |                               |   |           |  |  |  |      |   
|------------------------ |  | ------------------------------ | ---------- |  | ----------------------------- | - | --------- |  |  |  | ---- | --
|                         |  | For the Year EndedDecember 31, |            |  | PercentageIncrease/(Decrease) |  
|                         |  | 2010                           |            |  | 2009                          |   |          
|Revenues:                |  |                                |            |  |                               |   |           |  |  |  |      |   
|Research and development |  |                                |            |  |                               |   |           |  |  |  |      |   
|Genentech                |  | $                              | 275,000    |  |                               | $ | 229,000   |  |  |  | 20   | % 
|Debiopharm               |  |                                |           |  |                               |   | 532,000   |  |  |  | (100 | %)
|Other                    |  |                                | 69,000     |  |                               |   | 20,000    |  |  |  | 245  | % 
|                         |  |                                |            |  |                               |   |           |  |  |  |      |   
|Subtotal                 |  |                                | 344,000    |  |                               |   | 781,000   |  |  |  | (56  | %)
|License fees             |  |                                |            |  |                               |   |           |  |  |  |      |   
|Genentech                |  |                                |           |  |                               |   | 6,000,000 |  |  |  | (100 | %)
|Debiopharm               |  |                                | 11,333,000 |  |                               |   | 1,667,000 |  |  |  | 580  | % 
|Micromet                 |  |                                | 4,000,000  |  |                               |   |          |  |  |  | 100  | % 
|Other                    |  |                                | 323,000    |  |                               |   | 142,000   |  |  |  | 127  | % 
|                         |  |                                |            |  |                               |   |           |  |  |  |      |   
|Subtotal                 |  |                                | 15,656,000 |  |                               |   | 7,809,000 |  |  |  | 100  | % 
|                         |  |                                |            |  |                               |   |           |  |  |  |      |   
|Total Revenues           |  | $                              | 16,000,000 |  |                               | $ | 8,590,000 |  |  |  | 86   | % 
|                         |  |                                |            |  |                               |   |           |  |  |  |      |   

Total revenues increased by $7,410,000, or 86% to $16,000,000 for the year ended December 31,
2010 as compared to $8,590,000 for the prior year, primarily related to an increase in our license fee revenues. We



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recorded license fee revenue of $333,000 and $1,667,000 for the year ended December 31, 2010 and 2009, respectively, related to the amortization of the $2,000,000 up-front license fee that
we received in August 2009 under our license agreement with Debiopharm. The performance period under this license agreement began in August 2009 and concluded during the first quarter of 2010. During the year ended December 31, 2010, we also
recorded license fee revenues of $11,000,000, comprised of an $8,000,000 contingent payment we received from Debiopharm upon acceptance by French regulatory authorities of Debiopharms clinical trial application for Debio 0932 in February 2010
and a $3,000,000 contingent payment we received from Debiopharm upon treatment of the fifth patient in this phase I clinical trial in July 2010.

During the year ended December 31, 2010, we also received settlement proceeds of $4,000,000 from Micromet, a former collaborator, pursuant to the settlement, mutual release and termination agreement
that we entered into with Micromet in February 2010. The settlement payment was made by Micromet to resolve a contract claim we filed related to our June 2001 agreement with Micromet, in which Micromet acquired certain intellectual property assets
relating to our single chain antibodies, including patents and license agreements. Because this settlement discharged and terminated all future payment obligations that would have arisen under the June 2001 agreement, we do not expect to receive any
additional revenues from Micromet.

During the year ended December 31, 2009, we recognized $6,000,000 in license revenue
as a result of Genentechs initiation of a pivotal phase II clinical trial in advanced BCC. Future contingent payments under our Genentech and Debiopharm agreements are tied to the successful achievement of clinical and regulatory objectives.

Operating Expenses

Research and development expenses are summarized as follows:



|                                                 |      |                                |            |      |                               |   |           |  |  |  |        |   
|------------------------------------------------ | ---- | ------------------------------ | ---------- | ---- | ----------------------------- | - | --------- |  |  |  | ------ | --
|Research and Development Program                 |      | For the YearEnded December 31, |            |      | PercentageIncrease/(Decrease) |  
|                                                 | 2010 |                                |            | 2009 |                               |  
|Hedgehog pathway inhibitor                       |      | $                              | 192,000    |      |                               | $ | 495,000   |  |  |  | (61    | %)
|CUDC-101 (HDAC, EGFR, Her2 inhibitor)            |      |                                | 3,327,000  |      |                               |   | 1,568,000 |  |  |  | 112    | % 
|Debio 0932 (formerly CUDC-305) (Hsp90 inhibitor) |      |                                | 43,000     |      |                               |   | 2,083,000 |  |  |  | (98    | %)
|Other network-targeted cancer programs           |      |                                | 7,237,000  |      |                               |   | 5,084,000 |  |  |  | 42     | % 
|Hedgehog small molecule agonist or protein       |      |                                | 9,000      |      |                               |   | 14,000    |  |  |  | (36    | %)
|Net (gain)/loss on disposition of assets         |      |                                | (98,000    | )    |                               |   | 1,000     |  |  |  | (9,900 | %)
|Stock-based compensation                         |      |                                | 663,000    |      |                               |   | 688,000   |  |  |  | (4     | %)
|                                                 |      |                                |            |      |                               |   |           |  |  |  |        |   
|Total research and development expenses          |      | $                              | 11,373,000 |      |                               | $ | 9,933,000 |  |  |  | 14     | % 
|                                                 |      |                                |            |      |                               |   |           |  |  |  |        |   

Our research and development expenses increased by $1,440,000, or 14%, to $11,373,000 for the year
ended December 31, 2010, as compared to $9,933,000 for the prior year. The increase in research and development expenses was primarily the result of an increase of $2,153,000 in spending relating to our preclinical network-targeted cancer
programs from the prior year period as we continued to conduct research in our ongoing efforts to select additional preclinical candidates for future development. In addition, spending primarily related to outside services and clinical costs
increased $1,731,000 over the prior year period for our CUDC-101 program, for which we completed a phase I trial in April 2010 and initiated a phase Ib expansion trial in August 2010. We expect that a majority of our research and development
expenses for the foreseeable future will be incurred in support of our research and development efforts for CUDC-101 and other network-targeted cancer programs.

Offsetting these increases, spending related to the Debio 0932 program decreased $2,040,000 from the prior year as Debiopharm assumed all future costs of the program following our entry into a license
agreement with



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Debiopharm in August 2009. During the year ended December 31, 2009, we also incurred expenses of $300,000 in sublicense payments that we made as a result of receiving $6,000,000 from
Genentech during 2009 for the achievement of a clinical development objective related to our Hedgehog pathway inhibitor program. No such expenses were incurred under the Genentech collaboration during the year ended December 31, 2010.

General and administrative expenses are summarized as follows:



|                                          |  |                                |            |  |                               |   |           |  |  |  |     |   
|----------------------------------------- |  | ------------------------------ | ---------- |  | ----------------------------- | - | --------- |  |  |  | --- | --
|                                          |  | For the Year EndedDecember 31, |            |  | PercentageIncrease/(Decrease) |  
|                                          |  | 2010                           |            |  | 2009                          |   |          
|Personnel                                 |  | $                              | 2,648,000  |  |                               | $ | 2,123,000 |  |  |  | 25  | % 
|Occupancy and depreciation                |  |                                | 401,000    |  |                               |   | 344,000   |  |  |  | 17  | % 
|Legal services                            |  |                                | 3,552,000  |  |                               |   | 2,543,000 |  |  |  | 40  | % 
|Consulting and professional services      |  |                                | 1,348,000  |  |                               |   | 1,548,000 |  |  |  | (13 | %)
|Insurance costs                           |  |                                | 256,000    |  |                               |   | 282,000   |  |  |  | (9  | %)
|Other general and administrative expenses |  |                                | 756,000    |  |                               |   | 696,000   |  |  |  | 9   | % 
|Stock-based compensation                  |  |                                | 1,304,000  |  |                               |   | 1,166,000 |  |  |  | 12  | % 
|                                          |  |                                |            |  |                               |   |           |  |  |  |     |   
|Total general and administrative expenses |  | $                              | 10,265,000 |  |                               | $ | 8,702,000 |  |  |  | 18  | % 
|                                          |  |                                |            |  |                               |   |           |  |  |  |     |   

General and administrative expenses increased by $1,563,000, or 18%, to $10,265,000 for the year
ended December 31, 2010, as compared to $8,702,000 for the prior year. This increase was primarily due to increased spending of $1,009,000 for legal services. We incurred $1,526,000 for the year ended December 31, 2010 as compared to
$731,000 for the prior year in expenses related to the Micromet arbitration proceeding, an increase of $795,000. The remainder of the increase in legal fees of $214,000 resulted from costs associated with increased patent costs, including fees
related to foreign patent filings. In addition, personnel costs increased $525,000 primarily resulting from discretionary bonuses to our executive officers, the majority of which was paid upon receipt of contingent payments received from Debiopharm
in 2010. No bonuses were paid to our executive officers in 2009. In addition, our executive officers compensation increased in the first quarter of 2010 to eliminate the pay reductions implemented in October 2008. Stock-based compensation also
increased $138,000 over the prior year primarily related to vesting of certain performance-based options in the first quarter of 2010. Finally, occupancy costs increased $57,000 for the year ended December 31, 2010 as a result of rent expense
for two locations during December 2010 as we completed the move to our new facility.

Offsetting these increases, consulting
and professional services decreased $200,000 from the prior year period primarily as the result of business development expenditures to facilitate the licensing agreement with Debiopharm in 2009.

Change in fair value of warrant liability.In connection with our January 2010 registered direct offering,
we issued warrants to purchase an aggregate of 1,612,322 shares of common stock, which became exercisable as of the closing of the transaction. The warrants have an initial exercise price of $3.55 per share and have a five-year term. The fair value
of the warrants was estimated at $2,181,000 on the January 2010 issuance date, and $1,605,000 as of December 31, 2010, using a Black-Scholes option pricing model under various probability-weighted outcomes which take into consideration the
protective, but limited, cash-settlement feature for the benefit of the warrantholder that includes a possible cash-settlement option in the event of a change of control until the later to occur of (i) two years from the date of original
issuance of the warrant and (ii) the date upon which Genentech or Roche submits a new drug application, or NDA for GDC-0449. We estimated that the fair value of the warrants at issuance using this model with the following assumptions assigned
to the varying outcomes: expected volatilities of 69.8% and 80%, risk free interest rates ranging from 1.42% to 2.38%, expected lives of three to five years and no dividends. The warrants will be revalued each reporting period with updated
assumptions, and the resulting change in fair value of the warrant liability will be recognized in the income statement. We estimated that the fair value of the warrants at December 31, 2010 was $1,605,000 using this same



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model with the following assumptions assigned to the varying outcomes: expected volatilities of 77.1% and 91.5%, risk free interest rates ranging from 1.0% to 1.6%, expected lives of three to
four years and no dividends. Expected volatility in both models was based on our historical volatility commensurate with the term of the warrants. The fair value of the warrants was recorded as a long-term liability. We recorded a gain of
approximately $576,000 for the year ended December 31, 2010 as a result of the decrease in the fair value of the warrant liability from issuance in January 2010.

Other Income

For the year ended December 31, 2010, interest and other
income was $627,000 as compared to $222,000 for the year ended December 31, 2009, an increase of $405,000, or 182%. The increase relates to federal tax grants totaling $489,000 that we received in the fourth quarter of 2010 under the Patient
Protection and Affordable Care Act of 2010. We do not have any ongoing obligations under these awards and we do not expect to receive any future payments related to these grants. Offsetting this increase, interest income decreased $84,000 from the
prior year period due to lower interest rates for the year ended December 31, 2010 as compared to the year ended December 31, 2009.

Net Loss Applicable to Common Stockholders

As a result of the foregoing,
we incurred a net loss applicable to common stockholders of $4,435,000 for the year ended December 31, 2010, as compared to $9,823,000 for the year ended December 31, 2009.

Years Ended December 31, 2009 and 2008

Revenues

Total revenues are summarized as follows:



|                         |  |                                |           |  |                               |   |           |  |  |  |      |   
|------------------------ |  | ------------------------------ | --------- |  | ----------------------------- | - | --------- |  |  |  | ---- | --
|                         |  | For the Year EndedDecember 31, |           |  | PercentageIncrease/(Decrease) |  
|                         |  | 2009                           |           |  | 2008                          |   |          
|Revenues:                |  |                                |           |  |                               |   |           |  |  |  |      |   
|Research and development |  |                                |           |  |                               |   |           |  |  |  |      |   
|Genentech                |  | $                              | 229,000   |  |                               | $ | 282,000   |  |  |  | (19  | %)
|Debiopharm               |  |                                | 532,000   |  |                               |   |          |  |  |  | 100  | % 
|Wyeth                    |  |                                |          |  |                               |   | 196,000   |  |  |  | (100 | %)
|Other                    |  |                                | 20,000    |  |                               |   | 36,000    |  |  |  | (44  | %)
|                         |  |                                |           |  |                               |   |           |  |  |  |      |   
|Subtotal                 |  |                                | 781,000   |  |                               |   | 514,000   |  |  |  | 52   | % 
|License fees             |  |                                |           |  |                               |   |           |  |  |  |      |   
|Genentech                |  |                                | 6,000,000 |  |                               |   | 6,000,000 |  |  |  |     |   
|Debiopharm               |  |                                | 1,667,000 |  |                               |   |          |  |  |  | 100  | % 
|Wyeth                    |  |                                |          |  |                               |   | 103,000   |  |  |  | (100 | %)
|Stryker                  |  |                                |          |  |                               |   | 1,750,000 |  |  |  | (100 | %)
|Other                    |  |                                | 142,000   |  |                               |   |          |  |  |  | 100  | % 
|                         |  |                                |           |  |                               |   |           |  |  |  |      |   
|Subtotal                 |  |                                | 7,809,000 |  |                               |   | 7,853,000 |  |  |  | (1   | %)
|                         |  |                                |           |  |                               |   |           |  |  |  |      |   
|Total Revenues           |  | $                              | 8,590,000 |  |                               | $ | 8,367,000 |  |  |  | 3    | % 
|                         |  |                                |           |  |                               |   |           |  |  |  |      |   

Total revenues increased by $223,000, or 3%, to $8,590,000 for the year ended December 31,
2009 as compared to $8,367,000 for the prior year. Our license revenues decreased slightly to $7,809,000 for the year ended December 31, 2009 as compared to $7,853,000 for the prior year due to offsetting variances among our current and former
licensees and collaborators. We recognized $1,667,000 under our August 2009 license



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agreement with Debiopharm. This increase was offset by a decrease of $1,750,000 in license revenue recognized from the sale and assignment of our remaining bone morphogenetic protein assets to
Stryker Corporation during the first quarter of 2008. In addition, we recognized license revenues of $6,000,000 in each of 2009 and 2008 upon the achievement of certain development objectives under our June 2003 collaboration with Genentech.

Offsetting the decrease in license revenues, research and development revenues increased by $267,000, or 52%, to $781,000 for
the year ended December 31, 2009 as compared to $514,000 for the prior year primarily related to the sale of clinical materials to Debiopharm during 2009 under the terms of the collaboration.

Operating Expenses

Research and development expenses are summarized as follows:



|                                                 |      |                                |           |      |                               |   |            |  |  |  |      |   
|------------------------------------------------ | ---- | ------------------------------ | --------- | ---- | ----------------------------- | - | ---------- |  |  |  | ---- | --
|Research and Development Program                 |      | For the YearEnded December 31, |           |      | PercentageIncrease/(Decrease) |  
|                                                 | 2009 |                                |           | 2008 |                               |  
|Hedgehog pathway inhibitor                       |      | $                              | 495,000   |      |                               | $ | 457,000    |  |  |  | 8    | % 
|CUDC-101 (HDAC, EGFR, Her2 inhibitor)            |      |                                | 1,568,000 |      |                               |   | 4,002,000  |  |  |  | (61  | %)
|Debio 0932 (formerly CUDC-305) (Hsp90 inhibitor) |      |                                | 2,083,000 |      |                               |   | 2,693,000  |  |  |  | (23  | %)
|Other network-targeted cancer programs           |      |                                | 5,084,000 |      |                               |   | 4,402,000  |  |  |  | 15   | % 
|Hedgehog small molecule agonist or protein       |      |                                | 14,000    |      |                               |   | 199,000    |  |  |  | (93  | %)
|Discovery research                               |      |                                |          |      |                               |   | 539,000    |  |  |  | (100 | %)
|Net impairment of assets                         |      |                                | 1,000     |      |                               |   | 191,000    |  |  |  | (99  | %)
|Stock-based compensation                         |      |                                | 688,000   |      |                               |   | 743,000    |  |  |  | (7   | %)
|                                                 |      |                                |           |      |                               |   |            |  |  |  |      |   
|Total research and development expenses          |      | $                              | 9,933,000 |      |                               | $ | 13,226,000 |  |  |  | (25  | %)
|                                                 |      |                                |           |      |                               |   |            |  |  |  |      |   

Our research and development expenses decreased by $3,293,000, or 25%, to $9,933,000 for the year
ended December 31, 2009, as compared to $13,226,000 for the prior year. The decrease in research and development expenses was primarily the result of a $2,434,000 decrease in spending related to CUDC-101 when compared to the same prior year
period. We incurred significant consulting and outside costs during the year ended December 31, 2008 as we prepared and filed the investigational new drug application for CUDC-101 with the FDA. Costs incurred during the year ended
December 31, 2009 were primarily comprised of costs associated with our ongoing phase I trial. In addition, spending related to CUDC-305 decreased by $610,000 as a result of the license agreement entered into with Debiopharm in August 2009.
Debiopharm has assumed all future costs related to this program as of August 2009.

The decrease in research and development
expenses was also due to our implementation of a plan to decrease spending in various research and development expense areas, particularly preclinical research in areas other than in our network-targeted cancer programs. Spending reductions included
decreases in contract medicinal chemistry and biology work that was being performed in China, and in personnel and occupancy costs. In addition, our Hedgehog agonist program under collaboration with Wyeth concluded in February 2008. As a result, we
decreased spending in our Hedgehog agonist and discovery research programs by $724,000 to $14,000 during the year ended December 31, 2009 as compared to spending of $738,000 on these programs during 2008.

Offsetting these decreases was an increase of $682,000 in spending relating to our preclinical network-targeted cancer programs from the
prior year as we continue to conduct research in our ongoing efforts to select additional preclinical candidates for future development.

During the year ended December 31, 2009, we also incurred expenses of $495,000 related to our Hedgehog pathway inhibitor program as compared to $457,000 during the same period in the prior year, an
increase of $38,000. We made $300,000 in payments to our university licensors in each of the years ending December 31, 2009 and 2008 relating to the contingent payments we received from Genentech for the achievement of a clinical development
objective during the respective periods.



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General and administrative expenses are summarized as follows:



|                                          |  |                                |           |  |                               |   |           |  |  |  |     |   
|----------------------------------------- |  | ------------------------------ | --------- |  | ----------------------------- | - | --------- |  |  |  | --- | --
|                                          |  | For the Year EndedDecember 31, |           |  | PercentageIncrease/(Decrease) |  
|                                          |  | 2009                           |           |  | 2008                          |   |          
|Personnel                                 |  | $                              | 2,123,000 |  |                               | $ | 2,298,000 |  |  |  | (8  | %)
|Occupancy and depreciation                |  |                                | 344,000   |  |                               |   | 376,000   |  |  |  | (9  | %)
|Legal services                            |  |                                | 2,543,000 |  |                               |   | 1,672,000 |  |  |  | 52  | % 
|Consulting and professional services      |  |                                | 1,548,000 |  |                               |   | 1,177,000 |  |  |  | 32  | % 
|Insurance costs                           |  |                                | 282,000   |  |                               |   | 352,000   |  |  |  | (20 | %)
|Other general and administrative expenses |  |                                | 696,000   |  |                               |   | 922,000   |  |  |  | (25 | %)
|Stock-based compensation                  |  |                                | 1,166,000 |  |                               |   | 1,463,000 |  |  |  | (20 | %)
|                                          |  |                                |           |  |                               |   |           |  |  |  |     |   
|Total general and administrative expenses |  | $                              | 8,702,000 |  |                               | $ | 8,260,000 |  |  |  | 5   | % 
|                                          |  |                                |           |  |                               |   |           |  |  |  |     |   

General and administrative expenses increased by $442,000, or 5%, to $8,702,000 for the year ended
December 31, 2009 as compared to $8,260,000 for the prior year. This increase was primarily due to increased spending for consulting and legal services. Fees for legal services increased $871,000 during the year ended December 31, 2009 as
compared to the prior year primarily due to costs associated with various matters, including $731,000 in preparation for an arbitration proceeding that we filed against a former collaborator in August 2009. Consulting services increased $371,000
primarily as the result of business development efforts used to facilitate the licensing agreement with Debiopharm.

Offsetting these increases, personnel costs decreased $175,000 due to pay decreases for executive officers implemented in the fourth
quarter of 2008. In addition, other general and administrative costs decreased by $226,000 as a result of lower travel costs and stock-based compensation, which decreased by $297,000 as a result of a decline in the grant date fair values of stock
options awarded in 2009 compared to 2008.

Other Income

For the year ended December 31, 2009, interest income was $222,000 as compared to $990,000 for the year ended December 31, 2008,
a decrease of $768,000, or 78%. The decrease in interest income resulted primarily from lower interest rates as well as lower average cash and investment balances for the year ended December 31, 2009 as compared to the year ended
December 31, 2008.

Net Loss Applicable to Common Stockholders

As a result of the foregoing, we incurred a net loss applicable to common stockholders of $9,823,000 for the year ended December 31,
2009, as compared to $12,123,000 for the year ended December 31, 2008.

Liquidity and Capital Resources

Sources of Liquidity

We
have financed our operations primarily through license fees, contingent cash payments and research and development funding from our collaborators and licensors, the private and public placement of our equity securities, debt financings and the
monetization of certain royalty rights.

At December 31, 2010, our principal sources of liquidity consisted of cash, cash
equivalents, and marketable securities of $40,380,000, excluding restricted investments of $497,000. Our cash and cash equivalents are highly liquid investments with a maturity of three months or less at date of purchase and consist of investments
in money market funds with commercial banks and financial institutions, short-term commercial paper, and government obligations. We maintain cash balances with financial institutions in excess of insured limits. While



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as of the date of this filing, we are not aware of any downgrades, material losses, or other significant deterioration in the fair value of our cash equivalents or marketable securities since
December 31, 2010, further deterioration in conditions of the global credit and financial markets could negatively impact our current portfolio of cash equivalents or marketable securities or our ability to meet our financing objectives.

On January 27, 2010, we completed a registered direct offering of 6,449,288 units with each unit consisting of
(i) one share of our common stock and (ii) one warrant to purchase 0.25 of one share of common stock, at a purchase price of $2.52 per unit. We received net proceeds from the sale of the units, after deducting offering expenses, of
approximately $14,942,000. In connection with this offering, we issued warrants to purchase an aggregate of 1,612,322 shares of common stock, which became exercisable as of the closing of the transaction. The warrants have an exercise price of $3.55
per share and have a five year term.

Cash Flows

The use of our cash flows for operations has primarily consisted of salaries and wages for our employees, facility and facility-related costs for our office and laboratory, fees paid in connection with
preclinical studies, laboratory supplies, consulting fees and legal fees. During 2008, we began incurring clinical costs associated with our phase I clinical trial of CUDC-101. We expect that costs associated with clinical studies will increase in
future periods assuming that CUDC-101 advances into further stages of clinical testing and other of our network-targeted cancer drug candidates reach clinical trials.

Net cash used in operating activities was $1,629,000 for the year ended December 31, 2010, compared to $7,589,000 for the year ended December 31, 2009. Cash used in operating activities during
the year ended December 31, 2010 was primarily the result of our net loss for the period of $4,435,000. Our loss was partially offset by non-cash charges consisting of stock-based compensation, changes in the fair value of our warrant
liability, non-cash interest expense, depreciation and a gain on the sale of assets totaling $1,663,000. In addition, changes in certain operating assets and liabilities affected operating cash during the year ended December 31, 2010, including
an increase in our accounts payable and accrued liabilities of $956,000 and a decrease of $240,000 in prepaid expenses and other assets. The decrease of $476,000 in deferred revenue primarily related to our August 2009 license agreement with
Debiopharm and was offset by a decrease of $423,000 in our accounts receivable.

Cash used in operating activities during the
year ended December 31, 2009 was primarily the result of our net loss for the period of $9,823,000. In addition, changes in certain operating assets and liabilities decreased operating cash during the year ended December 31, 2009,
including a decrease of $186,000 in our accounts payable and accrued liabilities, an increase of $408,000 in our accounts receivables and an increase of $254,000 in prepaid expenses and other current assets. Offsetting these decreases were an
increase in our deferred revenue of $476,000 as a result of our August 2009 license agreement with Debiopharm and noncash items, including stock-based compensation expense of $1,854,000 and depreciation expense of $751,000.

We expect to continue to use cash in operations as we continue to seek to advance our network-targeted cancer drug programs through
preclinical testing and into clinical development. In addition, in the future we may owe royalties and other contingent payments to our licensors based on the achievement of developmental milestones, product sales and other specified objectives.

Investing activities used cash of $14,889,000 for the year ended December 31, 2010. Cash used by investing activities
for the year ended December 31, 2010 resulted principally from $14,433,000 in net investment activity. Our restricted investments increased by $281,000 primarily related to a security deposit for a new facility lease entered into in September
2010 and we purchased $275,000 in fixed assets during the year ended December 31, 2010. Investing activities provided cash of $818,000 for the year ended December 31, 2009, resulting principally from $844,000 net investment activity to
fund ongoing operations for the year ended December 31, 2009.



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Financing activities provided cash of approximately $17,069,000 for the year ended
December 31, 2010, resulting principally from our January 2010 registered direct offering, which provided $14,942,000 in net proceeds. In addition, warrants for shares of common stock were exercised under our August 2007 private placement
providing approximately $1,778,000 in proceeds. The remaining cash of $350,000 was provided by the exercise of stock options and purchases of common stock under our employee stock purchase plan. Financing activities provided cash of approximately
$3,887,000 for the year ended December 31, 2009, resulting principally from the exercise of warrants for common stock under our August 2007 private placement providing approximately $3,089,000 in proceeds. The remaining cash of $798,000 was
provided by the exercise of stock options and purchases of common stock under our employee stock purchase plan.

Funding Requirements

We have incurred significant losses since our inception. As of December 31, 2010, we had an accumulated deficit of
approximately $722,229,000. We will require substantial funds to continue our research and development programs and to fulfill our planned operating goals. In particular, our currently planned operating and capital requirements include the need for
working capital to support our research and development activities for CUDC-101 and other small molecules that we are seeking to develop from our pipeline of network-targeted cancer programs, and to fund our general and administrative costs and
expenses.

Our ability to finance our company and to generate revenues will depend heavily on the ability of Genentech and
Roche to obtain favorable results in the ongoing and planned clinical trials of GDC-0449, including the ongoing clinical trials in BCC, and to successfully develop and commercialize GDC-0449. We have historically derived a substantial portion of our
revenue from the research funding portion of our collaboration agreements. However, we have no current source of research funding revenue. We expect that our only source of cash flows from operations for the foreseeable future will be:



| |  |  | up-front license payments and research and development funding that we may receive if we are able to successfully enter into new collaboration
agreements;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | contingent cash payments that we may receive for the achievement of development objectives under any new collaborations or our existing collaborations
with Genentech and Debiopharm; and
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | royalty payments that are contingent upon the successful commercialization of products based upon these collaborations.
| | - |  | -----------------------------------------------------------------------------------------------------------------------

We may not be able to successfully enter into or continue any corporate collaborations and the timing, amount and likelihood of us
receiving payments under such collaborations is highly uncertain. As a result, we cannot assure you that we will attain any further revenue under any collaborations or licensing arrangements.

We anticipate that existing cash, cash equivalents, marketable securities and working capital at December 31, 2010, should enable us
to maintain current and planned operations into the fourth quarter of 2012. Our future capital requirements, however, may vary from what we currently expect. There are a number of factors that may adversely affect our planned future capital
requirements and accelerate our need for additional financing, many of which are outside our control, including the following:



| |  |  | unanticipated costs in our research and development programs;
| | - |  | -------------------------------------------------------------



| |  |  | the timing and cost of obtaining regulatory approvals for our drug candidates;
| | - |  | ------------------------------------------------------------------------------



| |  |  | the timing, receipt and amount of payments, if any, from current and potential future collaborators;
| | - |  | ----------------------------------------------------------------------------------------------------



| |  |  | the timing and amount of payments due to licensors of patent rights and technology used in our drug candidates;
| | - |  | ---------------------------------------------------------------------------------------------------------------



| |  |  | unplanned costs to prepare, file, prosecute, maintain and enforce patent claims and other patent-related costs, including litigation costs and
technology license fees; and
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | unexpected losses in our cash investments or an inability to otherwise liquidate our cash investments due to unfavorable conditions in the capital
markets.
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------



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We may seek additional funding through public or private financings of debt or equity. The
market for emerging life science stocks in general, and the market for our common stock in particular, are highly volatile. Due to this and various other factors, including currently adverse general market conditions and the early-stage status of
our development pipeline, additional funding may not be available to us on acceptable terms, if at all. In addition, the terms of any financing may be dilutive or otherwise adversely affect other rights of our stockholders. We also expect to seek
additional funds through arrangements with collaborators, licensees or other third parties. These arrangements would generally require us to relinquish or encumber rights to some of our technologies or drug candidates, and we may not be able to
enter into such arrangements on acceptable terms, if at all. If we are unable to obtain additional funding on a timely basis, whether through sales of debt or equity or through third party collaboration or license arrangements, we may be required to
curtail or terminate some or all of our development programs, including some or all of our drug candidates.

Contractual Obligations

As of December 31, 2010, we had future payments required under contractual obligations and other commitments,
including an operating lease related to our facility, research services agreements, consulting agreements, and license agreements, as follows:



|                               |  |                                          |       |  |                   |   |       |                   |  |   |                    |  |  |                     |       |  |  |   |       | 
|------------------------------ |  | ---------------------------------------- | ----- |  | ----------------- | - | ----- | ----------------- |  | - | ------------------ |  |  | ------------------- | ----- |  |  | - | ----- | 
|                               |  | Payment Due By Period (amounts in 000s) |      
|                               |  | Total                                    |       |  | Less thanOne Year |   |       | One toThree Years |  |   | Three toFive Years |  |  | More thanFive Years |      
|Operating lease obligations(1) |  | $                                        | 4,401 |  |                   | $ | 509   |                   |  | $ | 1,180              |  |  | $                   | 1,278 |  |  | $ | 1,434 | 
|Outside service obligations(2) |  |                                          | 1,318 |  |                   |   | 1,203 |                   |  |   | 115                |  |  |                     |      |  |  |   |      | 
|Licensing obligations(3)       |  |                                          | 97    |  |                   |   | 97    |                   |  |   |                   |  |  |                     |      |  |  |   |      | 
|                               |  |                                          |       |  |                   |   |       |                   |  |   |                    |  |  |                     |       |  |  |   |       | 
|Total future obligations       |  | $                                        | 5,816 |  |                   | $ | 1,809 |                   |  | $ | 1,295              |  |  | $                   | 1,278 |  |  | $ | 1,434 | 
|                               |  |                                          |       |  |                   |   |       |                   |  |   |                    |  |  |                     |       |  |  |   |       | 



|(1) | Effective September 16, 2010, we entered into a new lease agreement with the Trustees of Lexington Office Realty Trust pursuant to which we have agreed to lease
24,529 square feet of property to be used for office, research and laboratory space located at 4 Maguire Road in Lexington, Massachusetts, to which we relocated in December 2010. The term of the lease agreement commenced on December 1, 2010,
and expires approximately seven years and two months from such date. The total cash obligation for the base rent over the initial term of the lease agreement is approximately $4,401,000. In addition to the base rent, we will also be responsible for
our share of operating expenses and real estate taxes, in accordance with the terms of the lease agreement. Amounts include contractual rent payments and exclude any impact of an early termination payment as defined in the agreement.
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(2) | Outside service obligations consist of agreements we have with outside labs, consultants and various other service organizations.
|--- | ---------------------------------------------------------------------------------------------------------------------------------



|(3) | Includes only obligations that are known to us as of December 31, 2010. In the future, we may owe royalties and other contingent payments to our licensees based on
the achievement of developmental milestones, product sales and specified other objectives.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Off-Balance Sheet Arrangements

We have no off-balance sheet arrangements as of December 31, 2010.

Inflation

We believe
that inflation has not had a significant impact on our revenue and results of operations since inception.



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New Accounting Pronouncements

In January 2010, the Financial Accounting Standards Board, or FASB, issued Accounting Standards Update, or ASU, 2010-06 Fair Value
Measurement and Disclosures (Topic 820): Improving Disclosures about Fair Value Measurements.This guidance provides for the following new required disclosures related to fair value measurements: 1) the amounts of and reasons for
significant transfers in and out of level one and level two inputs and 2) separate presentation of purchases, sales, issuances, and settlements on a gross basis rather than as one net number for level three reconciliations. The guidance also
clarifies existing disclosures as follows: 1) provide fair value measurement disclosures for each class of assets and liabilities and 2) provide disclosures about the valuation techniques and inputs used for both recurring and nonrecurring level two
or level three inputs. The new disclosures and clarifications of existing disclosures were effective beginning January 1, 2010. Disclosures about purchases, sales, issuances, and settlements in the roll forward of activity for level three fair
value measurements will be effective beginning January 1, 2011.

In April 2010, the FASB issued ASU No. 2010-17,
Revenue RecognitionMilestone Method(ASU 2010-017). ASU 2010-017 provides guidance in applying the milestone method of revenue recognition to research or development arrangements. Under this guidance management may recognize revenue
contingent upon the achievement of a milestone in its entirety, in the period in which the milestone is achieved, only if the milestone meets all the criteria within the guidance to be considered substantive. This ASU is effective on a prospective
basis for research and development milestones achieved in fiscal years, beginning on or after June 15, 2010, which for us is fiscal 2011. Early adoption is permitted; however, we plan to implement ASU No. 2010-17 prospectively, as such,
the effect of this guidance will be limited to future transactions. We do not expect adoption of this standard to have a material impact on our financial position or results of operations as we do not currently have any research and development
arrangements which will be accounted for under the milestone method.



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|ITEM 7A. | QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK
|-------- | ----------------------------------------------------------

Our current cash balances in excess of operating requirements are invested in cash equivalents and short-term marketable securities, which consist of time deposits and investments in money market funds
with commercial banks and financial institutions, short-term commercial paper, and government obligations with an average maturity of less than one year. All marketable securities are considered available for sale. The primary objective of our cash
investment activities is to preserve principal while at the same time maximizing the income we receive from our invested cash without significantly increasing risk of loss. This objective may be adversely affected by the ongoing economic downturn
and volatile business environment and continued unpredictable and unstable market conditions. Our marketable securities are subject to interest rate risk and will fall in value if market interest rates increase. While as of the date of this filing,
we are not aware of any downgrades, material losses, or other significant deterioration in the fair value of our cash equivalents or marketable securities since December 31, 2010, no assurance can be given that further deterioration in
conditions of the global credit and financial markets would not negatively impact our current portfolio of cash equivalents or marketable securities or our ability to meet our financing objectives. Further dislocations in the credit market may
adversely impact the value and/or liquidity of marketable securities owned by us. Our investments are investment grade securities, and deposits are with investment grade financial institutions. We believe that the realization of losses due to
changes in credit spreads is unlikely as we currently have the ability to hold our investments for a sufficient period of time to recover the fair value of the investment and there is sufficient evidence to indicate that the fair value of the
investment is recoverable. We do not use derivative financial instruments in our investment portfolio. We do not believe that a 10% change in interest rate percentages would have a material impact on the fair value of our investment portfolio or our
interest income.



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|ITEM 8. | FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA
|------- | -------------------------------------------

Managements Report on Internal Control Over Financial Reporting

Our
management is responsible for establishing and maintaining adequate internal control over financial reporting. Internal control over financial reporting is defined in Rules 13a-15(f) or 15d-15(f) promulgated under the Securities Exchange Act of
1934, as amended, as a process designed by, or under the supervision of, our principal executive and principal financial officers and effected by our board of directors, management and other personnel, to provide reasonable assurance regarding the
reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles and includes those policies and procedures that:



| |  |  | pertain to the maintenance of records that in reasonable detail accurately and fairly reflect the transactions and dispositions of our assets;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally
accepted accounting principles, and that our receipts and expenditures are being made only in accordance with authorizations of management and our directors; and
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of our assets that could have a
material effect on the financial statements.
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Because of its inherent limitations, internal control over
financial reporting may not prevent or detect misstatements. Also, projections of evaluations of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of
compliance with the policies or procedures may deteriorate.

Our management assessed the effectiveness of our internal control
over financial reporting as of December 31, 2010. In making this assessment our management used the criteria established in Internal ControlIntegrated Framework issued by the Committee of Sponsoring Organizations of the Treadway
Commission, or COSO.

Based on our assessment, management concluded that, as of December 31, 2010, our internal control
over financial reporting is effective based on the criteria established in Internal ControlIntegrated Framework issued by COSO.

The effectiveness of internal control over financial reporting as of December 31, 2010 has been audited by PricewaterhouseCoopers LLP, an independent registered public accounting firm, as stated in
their report which appears herein.



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Report of Independent Registered Public Accounting Firm

To the Board of Directors and Stockholders of Curis, Inc.:

In our opinion, the accompanying consolidated balance sheets and the related consolidated statements of operations and comprehensive loss, of
stockholders equity and of cash flows, present fairly, in all material respects, the financial position of Curis, Inc. and its subsidiaries at December 31, 2010 and 2009, and the results of their operations and their cash flows for each
of the three years in the period ended December 31, 2010 in conformity with accounting principles generally accepted in the United States of America. Also in our opinion, the Company maintained, in all material respects, effective internal
control over financial reporting as of December 31, 2010, based on criteria established in Internal ControlIntegrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). The
Companys management is responsible for these financial statements, for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the
accompanying Managements Report on Internal Control Over Financial Reporting. Our responsibility is to express opinions on these financial statements and on the Companys internal control over financial reporting based on our integrated
audits. We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the financial
statements are free of material misstatement and whether effective internal control over financial reporting was maintained in all material respects. Our audits of the financial statements included examining, on a test basis, evidence supporting the
amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. Our audit of internal control over financial
reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the
assessed risk. Our audits also included performing such other procedures as we considered necessary in the circumstances. We believe that our audits provide a reasonable basis for our opinions.

A companys internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial
reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A companys internal control over financial reporting includes those policies and procedures that
(i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (ii) provide reasonable assurance that transactions are recorded as
necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors
of the company; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the companys assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of
any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

/s/ PRICEWATERHOUSECOOPERS LLP

Boston, Massachusetts

March 8, 2011



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CURIS, INC. AND SUBSIDIARIES

Consolidated Balance Sheets



|                                                                                                                                                                                                                                  |  |              |              |   |      |   |              |  
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | ------------ | ------------ | - | ---- | - | ------------ | -
|                                                                                                                                                                                                                                  |  | December 31, |             
|                                                                                                                                                                                                                                  |  | 2010         |              |   | 2009 |  
|ASSETS                                                                                                                                                                                                                            |  |              |              |   |      |   |              |  
|Current Assets:                                                                                                                                                                                                                   |  |              |              |   |      |   |              |  
|Cash and cash equivalents                                                                                                                                                                                                         |  | $            | 7,826,549    |   |      | $ | 7,275,433    |  
|Marketable securities                                                                                                                                                                                                             |  |              | 32,553,269   |   |      |   | 17,759,464   |  
|Short-term investmentrestricted                                                                                                                                                                                                  |  |              | 219,458      |   |      |   | 216,002      |  
|Accounts receivable                                                                                                                                                                                                               |  |              | 92,371       |   |      |   | 515,758      |  
|Prepaid expenses and other current assets                                                                                                                                                                                         |  |              | 392,249      |   |      |   | 627,183      |  
|                                                                                                                                                                                                                                  |  |              |              |   |      |   |              |  
|Total current assets                                                                                                                                                                                                              |  |              | 41,083,896   |   |      |   | 26,393,840   |  
|                                                                                                                                                                                                                                  |  |              |              |   |      |   |              |  
|Property and equipment, net                                                                                                                                                                                                       |  |              | 302,721      |   |      |   | 715,429      |  
|Long-term investmentrestricted                                                                                                                                                                                                   |  |              | 277,546      |   |      |   |             |  
|Goodwill                                                                                                                                                                                                                          |  |              | 8,982,000    |   |      |   | 8,982,000    |  
|Other assets                                                                                                                                                                                                                      |  |              | 2,980        |   |      |   | 7,980        |  
|                                                                                                                                                                                                                                  |  |              |              |   |      |   |              |  
|Total assets                                                                                                                                                                                                                      |  | $            | 50,649,143   |   |      | $ | 36,099,249   |  
|                                                                                                                                                                                                                                  |  |              |              |   |      |   |              |  
|LIABILITIES AND STOCKHOLDERS EQUITY                                                                                                                                                                                              |  |              |              |   |      |   |              |  
|Current Liabilities:                                                                                                                                                                                                              |  |              |              |   |      |   |              |  
|Accounts payable                                                                                                                                                                                                                  |  | $            | 2,620,968    |   |      | $ | 1,561,914    |  
|Accrued liabilities                                                                                                                                                                                                               |  |              | 854,605      |   |      |   | 1,009,244    |  
|Deferred revenue                                                                                                                                                                                                                  |  |              |             |   |      |   | 475,833      |  
|                                                                                                                                                                                                                                  |  |              |              |   |      |   |              |  
|Total current liabilities                                                                                                                                                                                                         |  |              | 3,475,573    |   |      |   | 3,046,991    |  
|Warrants                                                                                                                                                                                                                          |  |              | 1,604,742    |   |      |   |             |  
|Other long-term liabilities                                                                                                                                                                                                       |  |              | 51,171       |   |      |   |             |  
|                                                                                                                                                                                                                                  |  |              |              |   |      |   |              |  
|Total liabilities                                                                                                                                                                                                                 |  |              | 5,131,486    |   |      |   | 3,046,991    |  
|                                                                                                                                                                                                                                  |  |              |              |   |      |   |              |  
|Commitments                                                                                                                                                                                                                       |  |              |              |   |      |   |              |  
|Stockholders Equity:                                                                                                                                                                                                             |  |              |              |   |      |   |              |  
|Common stock, $0.01 par value125,000,000 shares authorized; 76,803,868 shares issued and 75,756,161 shares outstanding at
December 31, 2010; and 68,360,067 shares issued and 67,312,360 shares outstanding at December 31, 2009 |  |              | 768,039      |   |      |   | 683,601      |  
|Additional paid-in capital                                                                                                                                                                                                        |  |              | 767,825,232  |   |      |   | 751,068,635  |  
|Treasury stock (at cost, 1,047,707 shares)                                                                                                                                                                                        |  |              | (891,274     | ) |      |   | (891,274     | )
|Deferred compensation                                                                                                                                                                                                             |  |              | (955         | ) |      |   | (15,904      | )
|Accumulated deficit                                                                                                                                                                                                               |  |              | (722,228,747 | ) |      |   | (717,793,437 | )
|Accumulated other comprehensive income                                                                                                                                                                                            |  |              | 45,362       |   |      |   | 637          |  
|                                                                                                                                                                                                                                  |  |              |              |   |      |   |              |  
|Total stockholders equity                                                                                                                                                                                                        |  |              | 45,517,657   |   |      |   | 33,052,258   |  
|                                                                                                                                                                                                                                  |  |              |              |   |      |   |              |  
|Total liabilities and stockholders equity                                                                                                                                                                                        |  | $            | 50,649,143   |   |      | $ | 36,099,249   |  
|                                                                                                                                                                                                                                  |  |              |              |   |      |   |              |  

The accompanying notes are an integral part of these consolidated financial statements.



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CURIS, INC. AND SUBSIDIARIES

Consolidated Statements of Operations and Comprehensive Loss



|                                                   |  |                          |            |   |      |   |             |      |  |   |             |  
|-------------------------------------------------- |  | ------------------------ | ---------- | - | ---- | - | ----------- | ---- |  | - | ----------- | -
|                                                   |  | Years Ended December 31, |           
|                                                   |  | 2010                     |            |   | 2009 |   |             | 2008 | 
|Revenues:                                          |  |                          |            |   |      |   |             |      |  |   |             |  
|Research and development                           |  | $                        | 343,732    |   |      | $ | 780,773     |      |  | $ | 514,099     |  
|License fees                                       |  |                          | 15,655,833 |   |      |   | 7,809,167   |      |  |   | 7,852,518   |  
|                                                   |  |                          |            |   |      |   |             |      |  |   |             |  
|Total revenues                                     |  |                          | 15,999,565 |   |      |   | 8,589,940   |      |  |   | 8,366,617   |  
|                                                   |  |                          |            |   |      |   |             |      |  |   |             |  
|Costs and Expenses:                                |  |                          |            |   |      |   |             |      |  |   |             |  
|Research and development                           |  |                          | 11,372,850 |   |      |   | 9,932,768   |      |  |   | 13,226,449  |  
|General and administrative                         |  |                          | 10,264,459 |   |      |   | 8,702,082   |      |  |   | 8,259,812   |  
|                                                   |  |                          |            |   |      |   |             |      |  |   |             |  
|Total costs and expenses                           |  |                          | 21,637,309 |   |      |   | 18,634,850  |      |  |   | 21,486,261  |  
|                                                   |  |                          |            |   |      |   |             |      |  |   |             |  
|Loss from operations                               |  |                          | (5,637,744 | ) |      |   | (10,044,910 | )    |  |   | (13,119,644 | )
|                                                   |  |                          |            |   |      |   |             |      |  |   |             |  
|Other Income:                                      |  |                          |            |   |      |   |             |      |  |   |             |  
|Interest income                                    |  |                          | 137,662    |   |      |   | 222,309     |      |  |   | 990,263     |  
|Change in fair value of warrant liability          |  |                          | 575,813    |   |      |   |            |      |  |   |            |  
|Other income                                       |  |                          | 488,959    |   |      |   |            |      |  |   | 6,283       |  
|                                                   |  |                          |            |   |      |   |             |      |  |   |             |  
|Total other income                                 |  |                          | 1,202,434  |   |      |   | 222,309     |      |  |   | 996,546     |  
|                                                   |  |                          |            |   |      |   |             |      |  |   |             |  
|Net loss                                           |  | $                        | (4,435,310 | ) |      | $ | (9,822,601  | )    |  | $ | (12,123,098 | )
|                                                   |  |                          |            |   |      |   |             |      |  |   |             |  
|Net Loss per Common Share (Basic and Diluted)      |  | $                        | (0.06      | ) |      | $ | (0.15       | )    |  | $ | (0.19       | )
|                                                   |  |                          |            |   |      |   |             |      |  |   |             |  
|Weighted Average Common Shares (Basic and Diluted) |  |                          | 74,959,158 |   |      |   | 65,060,514  |      |  |   | 63,378,159  |  
|                                                   |  |                          |            |   |      |   |             |      |  |   |             |  
|Net Loss                                           |  | $                        | (4,435,310 | ) |      | $ | (9,822,601  | )    |  | $ | (12,123,098 | )
|Unrealized Gain (Loss) on Marketable Securities    |  |                          | 44,725     |   |      |   | (90,869     | )    |  |   | 7,932       |  
|                                                   |  |                          |            |   |      |   |             |      |  |   |             |  
|Comprehensive loss                                 |  | $                        | (4,390,585 | ) |      | $ | (9,913,470  | )    |  | $ | (12,115,166 | )
|                                                   |  |                          |            |   |      |   |             |      |  |   |             |  



The accompanying notes are an
integral part of these consolidated financial statements.



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CURIS, INC. AND SUBSIDIARIES

Consolidated Statements of Stockholders Equity



|                                                                                                                                                                 |  |              |            |  |                          |   |         |               |  |   |                      |   |  |                    |          |   |                                            |   |          |                          |  |   |              |   |  |   |         |   |  |   |             |  
|---------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | ------------ | ---------- |  | ------------------------ | - | ------- | ------------- |  | - | -------------------- | - |  | ------------------ | -------- | - | ------------------------------------------ | - | -------- | ------------------------ |  | - | ------------ | - |  | - | ------- | - |  | - | ----------- | -
|                                                                                                                                                                 |  | Common Stock |            |  | AdditionalPaid-inCapital |   |         | TreasuryStock |  |   | DeferredCompensation |   |  | AccumulatedDeficit |          |   | AccumulatedOtherComprehensiveIncome (Loss) |   |          | TotalStockholdersEquity | 
|                                                                                                                                                                 |  | Shares       |            |  | Amount                   |   |         |               |  |   |                      |  
|Balance, December 31, 2007                                                                                                                                       |  |              | 64,288,793 |  |                          | $ | 642,888 |               |  | $ | 742,903,399          |   |  | $                  | (891,274 | ) |                                            | $ | (46,286  | )                        |  | $ | (695,847,738 | ) |  | $ | 83,574  |   |  | $ | 46,844,563  |  
|Issuances of common stock                                                                                                                                        |  |              | 412,612    |  |                          |   | 4,126   |               |  |   | 284,601              |   |  |                    |         |   |                                            |   |         |                          |  |   |             |   |  |   |        |   |  |   | 288,727     |  
|Recognition of employee stock-based compensation                                                                                                                 |  |              |           |  |                          |   |        |               |  |   | 2,182,100            |   |  |                    |         |   |                                            |   |         |                          |  |   |             |   |  |   |        |   |  |   | 2,182,100   |  
|Mark-to-market on stock options to non-employees                                                                                                                 |  |              |           |  |                          |   |        |               |  |   | (9,364               | ) |  |                    |         |   |                                            |   | 9,364    |                          |  |   |             |   |  |   |        |   |  |   |            |  
|Amortization of deferred compensation                                                                                                                            |  |              |           |  |                          |   |        |               |  |   |                     |   |  |                    |         |   |                                            |   | 24,372   |                          |  |   |             |   |  |   |        |   |  |   | 24,372      |  
|Unrealized gain on marketable securities                                                                                                                         |  |              |           |  |                          |   |        |               |  |   |                     |   |  |                    |         |   |                                            |   |         |                          |  |   |             |   |  |   | 7,932   |   |  |   | 7,932       |  
|Net loss                                                                                                                                                         |  |              |           |  |                          |   |        |               |  |   |                     |   |  |                    |         |   |                                            |   |         |                          |  |   | (12,123,098  | ) |  |   |        |   |  |   | (12,123,098 | )
|                                                                                                                                                                 |  |              |            |  |                          |   |         |               |  |   |                      |   |  |                    |          |   |                                            |   |          |                          |  |   |              |   |  |   |         |   |  |   |             |  
|Balance, December 31, 2008                                                                                                                                       |  |              | 64,701,405 |  |                          |   | 647,014 |               |  |   | 745,360,736          |   |  |                    | (891,274 | ) |                                            |   | (12,550  | )                        |  |   | (707,970,836 | ) |  |   | 91,506  |   |  |   | 37,224,596  |  
|Issuances of common stock upon the exercise of warrants                                                                                                          |  |              | 3,028,188  |  |                          |   | 30,282  |               |  |   | 3,058,470            |   |  |                    |         |   |                                            |   |         |                          |  |   |             |   |  |   |        |   |  |   | 3,088,752   |  
|Other issuances of common stock                                                                                                                                  |  |              | 630,474    |  |                          |   | 6,305   |               |  |   | 791,840              |   |  |                    |         |   |                                            |   |         |                          |  |   |             |   |  |   |        |   |  |   | 798,145     |  
|Recognition of employee stock-based compensation                                                                                                                 |  |              |           |  |                          |   |        |               |  |   | 1,749,798            |   |  |                    |         |   |                                            |   |         |                          |  |   |             |   |  |   |        |   |  |   | 1,749,798   |  
|Mark-to-market on stock options to non-employees                                                                                                                 |  |              |           |  |                          |   |        |               |  |   | 107,791              |   |  |                    |         |   |                                            |   | (107,791 | )                        |  |   |             |   |  |   |        |   |  |   |            |  
|Amortization of deferred compensation                                                                                                                            |  |              |           |  |                          |   |        |               |  |   |                     |   |  |                    |         |   |                                            |   | 104,437  |                          |  |   |             |   |  |   |        |   |  |   | 104,437     |  
|Unrealized loss on marketable securities                                                                                                                         |  |              |           |  |                          |   |        |               |  |   |                     |   |  |                    |         |   |                                            |   |         |                          |  |   |             |   |  |   | (90,869 | ) |  |   | (90,869     | )
|Net loss                                                                                                                                                         |  |              |           |  |                          |   |        |               |  |   |                     |   |  |                    |         |   |                                            |   |         |                          |  |   | (9,822,601   | ) |  |   |        |   |  |   | (9,822,601  | )
|                                                                                                                                                                 |  |              |            |  |                          |   |         |               |  |   |                      |   |  |                    |          |   |                                            |   |          |                          |  |   |              |   |  |   |         |   |  |   |             |  
|Balance, December 31, 2009                                                                                                                                       |  |              | 68,360,067 |  |                          |   | 683,601 |               |  |   | 751,068,635          |   |  |                    | (891,274 | ) |                                            |   | (15,904  | )                        |  |   | (717,793,437 | ) |  |   | 637     |   |  |   | 33,052,258  |  
|Issuance of common stock in conjunction with the registered direct offering, net of issuance costs of $1,310,000 and net of fair
value of warrants of $2,180,555 |  |              | 6,449,288  |  |                          |   | 64,493  |               |  |   | 12,697,269           |   |  |                    |         |   |                                            |   |         |                          |  |   |             |   |  |   |        |   |  |   | 12,761,762  |  
|Issuances of common stock upon the exercise of warrants                                                                                                          |  |              | 1,742,671  |  |                          |   | 17,427  |               |  |   | 1,760,097            |   |  |                    |         |   |                                            |   |         |                          |  |   |             |   |  |   |        |   |  |   | 1,777,524   |  
|Other issuances of common stock                                                                                                                                  |  |              | 251,842    |  |                          |   | 2,518   |               |  |   | 347,058              |   |  |                    |         |   |                                            |   |         |                          |  |   |             |   |  |   |        |   |  |   | 349,576     |  
|Recognition of employee stock-based compensation                                                                                                                 |  |              |           |  |                          |   |        |               |  |   | 1,979,090            |   |  |                    |         |   |                                            |   |         |                          |  |   |             |   |  |   |        |   |  |   | 1,979,090   |  
|Mark-to-market on stock options to non-employees                                                                                                                 |  |              |           |  |                          |   |        |               |  |   | (26,917              | ) |  |                    |         |   |                                            |   | 26,917   |                          |  |   |             |   |  |   |        |   |  |   |            |  
|Amortization of deferred compensation                                                                                                                            |  |              |           |  |                          |   |        |               |  |   |                     |   |  |                    |         |   |                                            |   | (11,968  | )                        |  |   |             |   |  |   |        |   |  |   | (11,968     | )
|Unrealized gain on marketable securities and other investments                                                                                                   |  |              |           |  |                          |   |        |               |  |   |                     |   |  |                    |         |   |                                            |   |         |                          |  |   |             |   |  |   | 44,725  |   |  |   | 44,725      |  
|Net loss                                                                                                                                                         |  |              |           |  |                          |   |        |               |  |   |                     |   |  |                    |         |   |                                            |   |         |                          |  |   | (4,435,310   | ) |  |   |        |   |  |   | (4,435,310  | )
|                                                                                                                                                                 |  |              |            |  |                          |   |         |               |  |   |                      |   |  |                    |          |   |                                            |   |          |                          |  |   |              |   |  |   |         |   |  |   |             |  
|Balance, December 31, 2010                                                                                                                                       |  |              | 76,803,868 |  |                          | $ | 768,039 |               |  | $ | 767,825,232          |   |  | $                  | (891,274 | ) |                                            | $ | (955     | )                        |  | $ | (722,228,747 | ) |  | $ | 45,362  |   |  | $ | 45,517,657  |  
|                                                                                                                                                                 |  |              |            |  |                          |   |         |               |  |   |                      |   |  |                    |          |   |                                            |   |          |                          |  |   |              |   |  |   |         |   |  |   |             |  

The accompanying notes are an integral part of these consolidated financial statements.



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CURIS, INC. AND SUBSIDIARIES

Consolidated Statements of Cash Flows



|                                                                            |  |                          |             |   |      |   |             |      |  |   |             |  
|--------------------------------------------------------------------------- |  | ------------------------ | ----------- | - | ---- | - | ----------- | ---- |  | - | ----------- | -
|                                                                            |  | Years Ended December 31, |            
|                                                                            |  | 2010                     |             |   | 2009 |   |             | 2008 | 
|Cash Flows from Operating Activities:                                       |  |                          |             |   |      |   |             |      |  |   |             |  
|Net loss                                                                    |  | $                        | (4,435,310  | ) |      | $ | (9,822,601  | )    |  | $ | (12,123,098 | )
|Adjustments to reconcile net loss to net cash used in operating activities: |  |                          |             |   |      |   |             |      |  |   |             |  
|Depreciation and amortization                                               |  |                          | 686,495     |   |      |   | 751,213     |      |  |   | 998,596     |  
|Stock-based compensation expense                                            |  |                          | 1,967,122   |   |      |   | 1,854,235   |      |  |   | 2,206,472   |  
|Change in fair value of warrant liability                                   |  |                          | (575,813    | ) |      |   |            |      |  |   |            |  
|Non-cash interest income                                                    |  |                          | (316,560    | ) |      |   |            |      |  |   |            |  
|Gain on sale of fixed assets and equipment                                  |  |                          | (98,107     | ) |      |   |            |      |  |   |            |  
|Impairment on property and equipment                                        |  |                          |            |   |      |   | 1,071       |      |  |   | 191,376     |  
|Changes in operating assets and liabilities:                                |  |                          |             |   |      |   |             |      |  |   |             |  
|Accounts receivable                                                         |  |                          | 423,387     |   |      |   | (408,417    | )    |  |   | 123,126     |  
|Prepaid expenses and other assets                                           |  |                          | 239,934     |   |      |   | (253,810    | )    |  |   | (23,920     | )
|Accounts payable and accrued and other liabilities                          |  |                          | 955,586     |   |      |   | (186,118    | )    |  |   | (1,961,115  | )
|Deferred revenue                                                            |  |                          | (475,833    | ) |      |   | 475,833     |      |  |   | (1,852,518  | )
|                                                                            |  |                          |             |   |      |   |             |      |  |   |             |  
|Total adjustments                                                           |  |                          | 2,806,211   |   |      |   | 2,234,007   |      |  |   | (317,983    | )
|                                                                            |  |                          |             |   |      |   |             |      |  |   |             |  
|Net cash used in operating activities                                       |  |                          | (1,629,099  | ) |      |   | (7,588,594  | )    |  |   | (12,441,081 | )
|                                                                            |  |                          |             |   |      |   |             |      |  |   |             |  
|Cash Flows from Investing Activities:                                       |  |                          |             |   |      |   |             |      |  |   |             |  
|Purchase of marketable securities                                           |  |                          | (65,897,078 | ) |      |   | (35,825,838 | )    |  |   | (35,377,459 | )
|Sale of marketable securities                                               |  |                          | 51,464,558  |   |      |   | 36,669,705  |      |  |   | 40,753,768  |  
|Increase in restricted cash/investments                                     |  |                          | (281,002    | ) |      |   | (5,995      | )    |  |   |            |  
|Expenditures for property and equipment                                     |  |                          | (274,840    | ) |      |   | (19,537     | )    |  |   | (60,546     | )
|Proceeds from sale of fixed assets and equipment                            |  |                          | 99,160      |   |      |   |            |      |  |   |            |  
|                                                                            |  |                          |             |   |      |   |             |      |  |   |             |  
|Net cash (used in) provided by investing activities                         |  |                          | (14,889,202 | ) |      |   | 818,335     |      |  |   | 5,315,763   |  
|                                                                            |  |                          |             |   |      |   |             |      |  |   |             |  
|Cash Flows from Financing Activities:                                       |  |                          |             |   |      |   |             |      |  |   |             |  
|Proceeds from issuance of common stock and warrants, net of issuance costs  |  |                          | 14,942,317  |   |      |   |            |      |  |   |            |  
|Proceeds from other issuances of common stock                               |  |                          | 2,127,100   |   |      |   | 3,886,897   |      |  |   | 288,727     |  
|Repayments of notes payable and capital leases                              |  |                          |            |   |      |   |            |      |  |   | (401,213    | )
|                                                                            |  |                          |             |   |      |   |             |      |  |   |             |  
|Net cash provided by (used in) financing activities                         |  |                          | 17,069,417  |   |      |   | 3,886,897   |      |  |   | (112,486    | )
|                                                                            |  |                          |             |   |      |   |             |      |  |   |             |  
|Net increase (decrease) in cash and cash equivalents                        |  |                          | 551,116     |   |      |   | (2,883,362  | )    |  |   | (7,237,804  | )
|Cash and cash equivalents, beginning of period                              |  |                          | 7,275,433   |   |      |   | 10,158,795  |      |  |   | 17,396,599  |  
|                                                                            |  |                          |             |   |      |   |             |      |  |   |             |  
|Cash and cash equivalents, end of period                                    |  | $                        | 7,826,549   |   |      | $ | 7,275,433   |      |  | $ | 10,158,795  |  
|                                                                            |  |                          |             |   |      |   |             |      |  |   |             |  
|Supplemental cash flow data                                                 |  |                          |             |   |      |   |             |      |  |   |             |  
|Cash paid during the year for:                                              |  |                          |             |   |      |   |             |      |  |   |             |  
|Interest                                                                    |  | $                        |            |   |      | $ |            |      |  | $ | 6,365       |  
|                                                                            |  |                          |             |   |      |   |             |      |  |   |             |  

The accompanying notes are an integral part of these consolidated financial statements.



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CURIS, INC. AND SUBSIDIARIES

Notes to Consolidated Financial Statements



|(1) | OPERATIONS
|--- | ----------

Curis, Inc.
(the Company or Curis) is a drug discovery and development company that is committed to leveraging its innovative signaling pathway drug technologies in seeking to develop next generation network-targeted cancer therapies.
Curis is building upon its past experiences in targeting signaling pathways, including the Hedgehog signaling pathway, in its efforts to develop network-targeted cancer therapies. Curis conducts research programs both internally and through
strategic collaborations.

The Company operates in a single reportable segment, which is the research and development of
innovative cancer therapeutics. The Company expects that any successful products would be used in the health care industry and would be regulated in the United States by the U.S. Food and Drug Administration, or FDA, and in overseas markets by
similar regulatory agencies.

The Company is subject to risks common to companies in the biotechnology industry including, but
not limited to, development by its competitors of new or better technological innovations, dependence on key personnel, its ability to protect proprietary technology, its ability to successfully advance discovery, preclinical and clinical stage drug
candidates in its internally funded programs, unproven technologies and drug development approaches, reliance on corporate collaborators and licensees to successfully research, develop and commercialize products based on the Companys
technologies, its ability to comply with FDA government regulations and approval requirements as well as its ability to execute on its business strategies and obtain adequate financing to fund its operations.

The Companys future operating results will largely depend on the magnitude of payments from its current and potential future
corporate collaborators and the progress of drug candidates currently in its research and development pipeline. The results of the Companys operations will vary significantly from year to year and quarter to quarter and depend on, among other
factors, the timing of its entry into new collaborations, if any, the timing of the receipt of payments from new or existing collaborators and the cost and outcome of any preclinical development or clinical trials then being conducted. The Company
anticipates that existing capital resources at December 31, 2010 should enable the Company to maintain its current and planned operations into the fourth quarter of 2012. The Companys ability to continue funding its planned operations
beyond the fourth quarter of 2012 is dependent upon, among other things, the success of its collaborations with Genentech and Debiopharm and receipt of additional cash payments under these collaborations, its ability to control expenses and its
ability to raise additional funds through equity or debt financings, new collaborations or other sources of financing.



|(2) | SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
|--- | ------------------------------------------



| | (a) | USE OF ESTIMATES
| | --- | ----------------

The
preparation of the Companys consolidated financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts and
disclosure of revenue, expenses and certain assets and liabilities at the balance sheet date. Such estimates include the performance obligations under the Companys collaboration agreements, the collectibility of receivables, the carrying value
of property and equipment and intangible assets, the assumptions used in the Companys valuation of stock-based compensation and the value of certain investments and liabilities, including our long-term warrant liability. Actual results may
differ from such estimates.



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| | (b) | CONSOLIDATION
| | --- | -------------

The accompanying
consolidated financial statements include the Company and its wholly owned subsidiaries, Curis Securities Corporation, Inc. and Curis Pharmaceuticals (Shanghai) Co., Ltd., or Curis Shanghai. The Company has eliminated all intercompany transactions
in each of the years ended December 31, 2010, 2009 or 2008.



| | (c) | REVENUE RECOGNITION
| | --- | -------------------

The
Companys business strategy includes entering into collaborative license and development agreements with biotechnology and pharmaceutical companies for the development and commercialization of the Companys product candidates. The terms of
the agreements typically include non-refundable license fees, funding of research and development, payments based upon achievement of clinical development and regulatory objectives, and royalties on product sales. The Company follows the provisions
of Financial Accounting Standards Board, or FASB, Codification Topic 605, Revenue Recognition.

License Fees and
Multiple Element Arrangements

In January 2010, the Company adopted a new U.S. generally accepted accounting
principles, or GAAP, accounting standard on a prospective basis which amends existing revenue recognition accounting guidance to provide accounting principles and application guidance on whether multiple deliverables exist, how the arrangement
should be separated, and the consideration allocated. This new guidance eliminates the requirement to establish objective evidence of fair value of undelivered products and services and instead provides for separate revenue recognition based upon
managements estimate of the selling price for an undelivered item when there is no vendor-specific objective evidence or third-party evidence to determine the fair value of that undelivered item. The Company did not enter into any multiple
element arrangements or modify its existing collaborations during the year ended December 31, 2010. The adoption of the new standard did not have an impact on the 2010 financial statements.

For multiple element arrangements, including license agreements, entered into prior to January 1, 2010, guidance required that the
fair value of the undelivered item be the price of the item either sold in a separate transaction between unrelated third parties or the price charged for each item when the item is sold separately by the vendor. This was difficult to determine when
the product was not individually sold because of its unique features. Under this guidance, if the fair value of all of the undelivered elements in the arrangement was not determinable, then revenue was deferred until all of the items were delivered
or fair value was determined.

Non-refundable license fees are recognized as revenue when the Company has a contractual right
to receive such payment, the contract price is fixed or determinable, the collection of the resulting receivable is reasonably assured and the Company has no further performance obligations under the license agreement. Multiple element arrangements,
such as license and development arrangements are analyzed to determine whether the deliverables, which often include a license and performance obligations such as research and steering committee services, can be separated or whether they must be
accounted for as a single unit of accounting in accordance with U.S. GAAP. The Company recognizes up-front license payments as revenue upon delivery of the license only if the license has stand-alone value and the fair value of the undelivered
performance obligations, typically including research and/or steering committee services, can be determined. If the fair value of the undelivered performance obligations can be determined, such obligations would then be accounted for separately as
performed. If the license is considered to either (i) not have stand-alone value or (ii) have stand-alone value but the fair value of any of the undelivered performance obligations cannot be determined, the arrangement would then be
accounted for as a single unit of accounting and the license payments and payments for performance obligations are recognized as revenue over the estimated period of when the performance obligations are performed.



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If the Company is involved in a steering committee as part of a multiple element arrangement
that is accounted for as a single unit of accounting, the Company assesses whether its involvement constitutes a performance obligation or a right to participate. Steering committee services that are determined to be performance obligations are
combined with other research services or performance obligations required under an arrangement, if any, in determining the level of effort required in an arrangement and the period over which the Company expects to complete its aggregate performance
obligations.

Whenever the Company determines that an arrangement should be accounted for as a single unit of accounting, it
must determine the period over which the performance obligations will be performed and revenue will be recognized. Revenue will be recognized using either a relative performance or straight-line method. The Company recognizes revenue using the
relative performance method provided that the Company can reasonably estimate the level of effort required to complete its performance obligations under an arrangement and such performance obligations are provided on a best-efforts basis. Direct
labor hours or full-time equivalents are typically used as the measure of performance. Revenue recognized under the relative performance method would be determined by multiplying the total payments under the contract, excluding royalties and
payments contingent upon achievement of substantive milestones, by the ratio of level of effort incurred to date to estimated total level of effort required to complete the Companys performance obligations under the arrangement. Revenue is
limited to the lesser of the cumulative amount of payments received or the cumulative amount of revenue earned, as determined using the relative performance method, as of each reporting period.

If the Company cannot reasonably estimate the level of effort required to complete its performance obligations under an arrangement, the
performance obligations are provided on a best-efforts basis and the Company can reasonably estimate when the performance obligation ceases or the remaining obligations become inconsequential and perfunctory, then the total payments under the
arrangement, excluding royalties and payments contingent upon achievement of substantive milestones, would be recognized as revenue on a straight-line basis over the period the Company expects to complete its performance obligations. Revenue is
limited to the lesser of the cumulative amount of payments received or the cumulative amount of revenue earned, as determined using the straight-line basis, as of the period ending date.

If the Company cannot reasonably estimate when its performance obligation either ceases or becomes inconsequential and perfunctory, then
revenue is deferred until the Company can reasonably estimate when the performance obligation ceases or becomes inconsequential. Revenue is then recognized over the remaining estimated period of performance.

Significant management judgment is required in determining the level of effort required under an arrangement and the period over which the
Company is expected to complete its performance obligations under an arrangement.

Substantive Milestone Payments

Collaboration agreements may also contain substantive milestone payments. Substantive milestone payments are
recognized upon achievement of the milestone only if all of the following conditions are met:



| |  |  | the milestone payments are non-refundable;
| | - |  | ------------------------------------------



| |  |  | achievement of the milestone involves a degree of risk and was not reasonably assured at the inception of the arrangement;
| | - |  | --------------------------------------------------------------------------------------------------------------------------



| |  |  | substantive Company effort is involved in achieving the milestone;
| | - |  | ------------------------------------------------------------------



| |  |  | the amount of the milestone payment is reasonable in relation to the effort expended or the risk associated with achievement of the milestone; and
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------



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| |  |  | a reasonable amount of time passes between the up-front license payment and the first milestone payment as well as between each subsequent milestone
payment.
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------

Determination as to whether a payment meets the aforementioned conditions involves
managements judgment. If any of these conditions are not met, the resulting payment would not be considered a substantive milestone, and therefore the resulting payment would be considered part of the consideration for the single unit of
accounting and would be recognized as revenue as such performance obligations are performed under either the relative performance or straight-line methods, as applicable, and in accordance with these policies as described above. In addition, the
determination that one such payment was not a substantive milestone could prevent the Company from concluding that subsequent milestone payments were substantive milestones and, as a result, any additional milestone payments could also be considered
part of the consideration for the single unit of accounting and would be recognized as revenue as such performance obligations are performed under either the relative performance or straight-line methods, as applicable. Milestones that are tied to
regulatory approval are not considered probable of being achieved until such approval is received. Milestones tied to counter-party performance are not included in the Companys revenue model until the performance conditions are met.

Reimbursement of Costs

Reimbursement of research and development costs by third party collaborators is recognized as revenue provided the Company has determined that it is acting primarily as a principal in the transaction
according to the provisions outlined in FASB Codification Topic 605-45, Revenue Recognition, Principal Agent Considerations, the amounts are determinable and collection of the related receivable is reasonably assured.

Royalty Revenue

Royalty revenue is recognized upon the sale of the related products, provided that the royalty amounts are fixed or determinable, collection of the related receivable is reasonably assured and the Company
has no remaining performance obligations under the arrangement. If royalties are received when the Company has remaining performance obligations, the royalty payments would be attributed to the services being provided under the arrangement and
therefore would be recognized as such performance obligations are performed under either the relative performance or straight line methods, as applicable, and in accordance with these policies as described above.

Deferred Revenue

Amounts received prior to satisfying the above revenue recognition criteria would be recorded as deferred revenue in the accompanying consolidated balance sheets. Amounts not expected to be recognized
during the year ending December 31, 2011 would be classified as long-term deferred revenue. As of December 31, 2010, the Company had no amounts classified as short-term or long-term deferred revenue.

Summary

During the years ended December 31, 2010, 2009 and 2008, total gross revenues from major current and former licensees as a percent of total gross revenues of the Company were as follows:



|                             |  |                         |    |   |      |  |    |      |  |  |    |  
|---------------------------- |  | ----------------------- | -- | - | ---- |  | -- | ---- |  |  | -- | -
|                             |  | Year Ended December 31, |   
|                             |  | 2010                    |    |   | 2009 |  |    | 2008 | 
|Genentech                    |  |                         | 2  | % |      |  | 73 | %    |  |  | 75 | %
|Debiopharm                   |  |                         | 71 | % |      |  | 26 | %    |  |  |   | %
|Micromet settlement proceeds |  |                         | 25 | % |      |  |   | %    |  |  |   | %
|Stryker Corporation          |  |                         |   | % |      |  |   | %    |  |  | 21 | %



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| | (d) | RESEARCH AND DEVELOPMENT
| | --- | ------------------------

Research and development costs, including internal and external costs, are charged to operations as incurred. Research and development
costs include personnel costs, lab supplies, outside services including clinical research organizations, medicinal chemistry, sublicense payments to licensors, consulting agreements, allocations of facility costs and fringe benefits, and other
costs.



| | (e) | CASH EQUIVALENTS, MARKETABLE SECURITIES AND INVESTMENTS
| | --- | -------------------------------------------------------

Cash equivalents consist of short-term, highly liquid investments purchased with original maturities of three months or less. All other liquid investments are classified as marketable securities. All of
the Companys marketable securities have been designated as available-for-sale and are stated at market value with any unrealized holding gains or losses included as a component of stockholders equity and any realized gains and losses
recorded in the statement of operations in the period the securities are sold.

The amortized cost, unrealized gains or losses
and fair value of marketable securities available-for-sale as of December 31, 2010, with maturity dates ranging between one and twelve months and with a weighted average maturity of 3.4 months are as follows:



|                            |  |               |            |  |                       |   |        |            |  |   |            | 
|--------------------------- |  | ------------- | ---------- |  | --------------------- | - | ------ | ---------- |  | - | ---------- | 
|                            |  | AmortizedCost |            |  | UnrealizedGain/(Loss) |   |        | Fair Value | 
|U.S. Government obligations |  | $             | 3,601,000  |  |                       | $ | (1,000 | )          |  | $ | 3,600,000  | 
|Corporate bonds and notes   |  |               | 28,956,000 |  |                       |   | (3,000 | )          |  |   | 28,953,000 | 
|                            |  |               |            |  |                       |   |        |            |  |   |            | 
|Total marketable securities |  | $             | 32,557,000 |  |                       | $ | (4,000 | )          |  | $ | 32,553,000 | 
|                            |  |               |            |  |                       |   |        |            |  |   |            | 

In addition, as of December 31, 2010, the Company held unregistered shares of common stock of BioTime,
Inc., a publicly traded US biotechnology company, valued at $54,000 in the Prepaid Expenses and Other Current Assets section of its Consolidated Balance Sheet. These shares were issued to the Company in May 2010 in exchange for the
Companys shares of capital stock of ESI Cell International, a privately-owned company that was acquired by BioTime in May 2010. The shares of BioTime common stock held by the Company were registered for re-sale in January 2011, at which time
the shares became fully tradeable on the American Stock Exchange. As of December 31, 2009, the shares of capital stock of ESI Cell International that were held by the Company prior to its acquisition by BioTime were valued at $5,000.

The amortized cost, unrealized gains or losses and fair value of marketable securities available-for-sale as of
December 31, 2009, with maturity dates ranging between one and twelve months and with a weighted average maturity of 3.3 months are as follows:



|                            |  |               |            |  |                       |   |        |            |  |   |            | 
|--------------------------- |  | ------------- | ---------- |  | --------------------- | - | ------ | ---------- |  | - | ---------- | 
|                            |  | AmortizedCost |            |  | UnrealizedGain/(Loss) |   |        | Fair Value | 
|U.S. Government obligations |  | $             | 14,262,000 |  |                       | $ | (1,000 | )          |  | $ | 14,261,000 | 
|Corporate bonds and notes   |  |               | 3,497,000  |  |                       |   | 1,000  |            |  |   | 3,498,000  | 
|                            |  |               |            |  |                       |   |        |            |  |   |            | 
|Total marketable securities |  | $             | 17,759,000 |  |                       | $ |       |            |  | $ | 17,759,000 | 
|                            |  |               |            |  |                       |   |        |            |  |   |            | 



| | (f) | FAIR VALUE OF FINANCIAL INSTRUMENTS
| | --- | -----------------------------------

The Company discloses fair value measurements based on a framework outlined by GAAP which requires expanded disclosures regarding fair value measurements. GAAP also defines fair value as the exchange
price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Market
participants are buyers and sellers in the principal market that are (i) independent, (ii) knowledgeable, (iii) able to transact, and (iv) willing to transact.



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FASB Codification Topic 820, Fair Value Measurements and Disclosures,requires the
use of valuation techniques that are consistent with the market approach, the income approach and/or the cost approach. The market approach uses prices and other relevant information generated by market transactions involving identical or comparable
assets and liabilities. The income approach uses valuation techniques to convert future amounts, such as cash flows or earnings, to a single present amount on a discounted basis. The cost approach is based on the amount that currently would be
required to replace the service capacity of an asset (replacement cost). Valuation techniques should be consistently applied. GAAP also establishes a fair value hierarchy which requires an entity to maximize the use of observable inputs, where
available, and minimize the use of unobservable inputs when measuring fair value. The standard describes three levels of inputs that may be used to measure fair value:



|        |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|------- |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|Level 1 |  | Quoted prices in active markets for identical assets or liabilities. The Companys Level 1 assets include cash equivalents,
investments in marketable securities, and restricted investments. The Company held cash equivalents and marketable securities of $6,193,000 and $32,553,000, respectively, as of December 31, 2010, and $6,422,000 and $17,759,000, respectively, as
of December 31, 2009. The Companys marketable securities are investments with original maturities of greater than three months from the date of purchase, but less than twelve months from the balance sheet date, and consist of commercial
paper and government obligations. These amounts are invested directly in commercial paper of financial institutions and corporations with A-/Aa3 or better long-term ratings and A-1/P-1 short term debt ratings, U.S. Treasury securities and U.S.
Treasury money market funds.  The Company also had a short-term restricted
investment of $219,000 and a long-term restricted investment of $278,000 as of December 31, 2010 that were solely comprised of certificates of deposit pursuant to the requirements of the Companys property leases. The restriction on the
short-term investment was lifted on January 31, 2011.
|        | 
|Level 2 |  | Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are
observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. The Company has no Level 2 assets or liabilities at December 31, 2010.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|        | 
|Level 3 |  | Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. The Companys warrant liability
was valued at issuance and at December 31, 2010 using a probability-weighted Black-Scholes model, discussed further in Note 9, and is therefore classified as Level 3.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          

In accordance with the fair value hierarchy, the following table shows the fair value as of December 31, 2010 and 2009, of those
financial assets that are measured at fair value on a recurring basis, according to the valuation techniques the Company used to determine their fair market value. No financial assets are measured at fair value on a nonrecurring basis at
December 31, 2010 and 2009.



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|                                                 |  |                                         |            |  |                                 |   |   |                              |  |   |            |  |  |   |            | 
|------------------------------------------------ |  | --------------------------------------- | ---------- |  | ------------------------------- | - | - | ---------------------------- |  | - | ---------- |  |  | - | ---------- | 
|                                                 |  | Quoted Prices inActive Markets(Level 1) |            |  | OtherObservableInputs (Level 2) |   |   | UnobservableInputs (Level 3) |  |   | Fair Value | 
|As of December 31, 2010:                         |  |                                         |            |  |                                 |   |   |                              |  |   |            |  |  |   |            | 
|Cash equivalents                                 |  |                                         |            |  |                                 |   |   |                              |  |   |            |  |  |   |            | 
|Money market funds                               |  | $                                       | 3,863,000  |  |                                 | $ |  |                              |  | $ |           |  |  | $ | 3,863,000  | 
|Municipal bonds                                  |  |                                         | 2,330,000  |  |                                 |   |  |                              |  |   |           |  |  |   | 2,330,000  | 
|Investments                                      |  |                                         |            |  |                                 |   |   |                              |  |   |            |  |  |   |            | 
|US government obligations                        |  |                                         | 3,600,000  |  |                                 |   |  |                              |  |   |           |  |  |   | 3,600,000  | 
|Corporate commercial paper, bonds and notes      |  |                                         | 28,953,000 |  |                                 |   |  |                              |  |   |           |  |  |   | 28,953,000 | 
|Restricted investments (certificates of deposit) |  |                                         | 497,000    |  |                                 |   |  |                              |  |   |           |  |  |   | 497,000    | 
|                                                 |  |                                         |            |  |                                 |   |   |                              |  |   |            |  |  |   |            | 
|Total assets at fair value                       |  | $                                       | 39,243,000 |  |                                 | $ |  |                              |  | $ |           |  |  | $ | 39,243,000 | 
|                                                 |  |                                         |            |  |                                 |   |   |                              |  |   |            |  |  |   |            | 
|As of December 31, 2009:                         |  |                                         |            |  |                                 |   |   |                              |  |   |            |  |  |   |            | 
|Cash equivalents                                 |  |                                         |            |  |                                 |   |   |                              |  |   |            |  |  |   |            | 
|Money market funds                               |  | $                                       | 5,422,000  |  |                                 | $ |  |                              |  | $ |           |  |  | $ | 5,422,000  | 
|Corporate bonds and notes                        |  |                                         | 1,000,000  |  |                                 |   |  |                              |  |   |           |  |  |   | 1,000,000  | 
|Investments                                      |  |                                         |            |  |                                 |   |   |                              |  |   |            |  |  |   |            | 
|US government obligations                        |  |                                         | 14,261,000 |  |                                 |   |  |                              |  |   |           |  |  |   | 14,261,000 | 
|Corporate bonds and notes                        |  |                                         | 3,498,000  |  |                                 |   |  |                              |  |   |           |  |  |   | 3,498,000  | 
|Restricted investments (certificate of deposit)  |  |                                         | 216,000    |  |                                 |   |  |                              |  |   |           |  |  |   | 216,000    | 
|                                                 |  |                                         |            |  |                                 |   |   |                              |  |   |            |  |  |   |            | 
|Total assets at fair value                       |  | $                                       | 24,397,000 |  |                                 | $ |  |                              |  | $ |           |  |  | $ | 24,397,000 | 
|                                                 |  |                                         |            |  |                                 |   |   |                              |  |   |            |  |  |   |            | 

The following table rolls forward the fair value of the Companys warrant liability, the fair value of
which is determined by Level 3 inputs for the year ended December 31, 2010:



|                             |  |   |           |  
|---------------------------- |  | - | --------- | -
|Balance at December 31, 2009 |  | $ |          |  
|Issuance of warrants         |  |   | 2,181,000 |  
|Change in fair value         |  |   | (576,000  | )
|                             |  |   |           |  
|Balance at December 31, 2010 |  | $ | 1,605,000 |  
|                             |  |   |           |  



| | (g) | LONG-LIVED ASSETS OTHER THAN GOODWILL
| | --- | -------------------------------------

Long-lived assets other than goodwill consist primarily of property and equipment and a restricted long-term investment. The aggregate balances for these long-lived assets were $583,000 and $723,000 as of
December 31, 2010 and 2009, respectively. The Company applies the guidance in FASB Codification Topic 360-10-05, Impairment or Disposal of Long-Lived Assets. If it were determined that the carrying value of the Companys other
long-lived assets might not be recoverable based upon the existence of one or more indicators of impairment, the Company would measure an impairment based on application of GAAP. During the years ended December 31, 2010, 2009 and 2008, the
Company recognized impairment charges of $1,000, $1,000 and $191,000, respectively, related to certain equipment with no current or planned future use.

Purchased equipment is recorded at cost. The Company does not currently hold any leased equipment. Depreciation and amortization are provided on the straight-line method over the estimated useful lives of
the related assets or the remaining terms of the leases, whichever is shorter, as follows:



|                                             |  |                                                    
|-------------------------------------------- |  | ---------------------------------------------------
|Asset Classification                         |  | Estimated Useful Life                              
|Laboratory equipment, computers and software |  | 3-5 years                                          
|Leasehold improvements                       |  | Lesser of life of the lease or thelife of the asset
|Office furniture and equipment               |  | 5 years                                            



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| | (h) | GOODWILL
| | --- | --------

As of
December 31, 2010 and 2009, the Company had recorded goodwill of $8,982,000. The Company applies the guidance in FASB Codification Topic 350, IntangiblesGoodwill and Other. During each of December 2010, 2009 and 2008, the Company
completed its annual goodwill impairment tests and determined that the Company represented a single reporting unit and as of those dates the fair value of the Company exceeded the carrying value of its net assets. Accordingly, no goodwill impairment
was recognized for the years ended December 31, 2010, 2009 and 2008.



| | (i) | TREASURY STOCK
| | --- | --------------

On May 31,
2002, the Company announced that its Board of Directors had approved the repurchase of up to $3,000,000 of the Companys common stock. The Company accounts for its common stock repurchases as treasury stock under the cost method. In 2002, the
Company repurchased 1,047,707 shares of its common stock at a cost of $891,000 pursuant to this repurchase program, and the Company has not purchased any shares since 2002.



| | (j) | BASIC AND DILUTED LOSS PER COMMON SHARE
| | --- | ---------------------------------------

Basic and diluted net losses per share were determined by dividing net loss by the weighted average number of common shares outstanding during the period. Diluted net loss per common share is the same as
basic net loss per common share for all periods presented, as the effect of the potential common stock equivalents is antidilutive due to the Companys net loss position for all periods presented. Antidilutive securities consist of stock
options, warrants and shares issuable under the Companys 2000 Employee Stock Purchase Plan outstanding as of the respective reporting period. Antidilutive securities as of December 31, 2010, 2009 and 2008 consisted of the following:



|                              |  |                                  |            |  |      |  |            |      |  |  |            | 
|----------------------------- |  | -------------------------------- | ---------- |  | ---- |  | ---------- | ---- |  |  | ---------- | 
|                              |  | For the years ended December 31, |           
|                              |  | 2010                             |            |  | 2009 |  |            | 2008 | 
|Stock options outstanding     |  |                                  | 11,537,750 |  |      |  | 11,141,831 |      |  |  | 10,450,759 | 
|Warrants outstanding          |  |                                  | 1,612,322  |  |      |  | 1,742,671  |      |  |  | 5,322,361  | 
|Shares issuable under ESPP    |  |                                  |           |  |      |  |           |      |  |  | 38,453     | 
|                              |  |                                  |            |  |      |  |            |      |  |  |            | 
|Total antidilutive securities |  |                                  | 13,150,072 |  |      |  | 12,884,502 |      |  |  | 15,811,573 | 
|                              |  |                                  |            |  |      |  |            |      |  |  |            | 



| | (k) | STOCK-BASED COMPENSATION
| | --- | ------------------------

The
Company adopted Statement of Financial Accounting Standards, or SFAS, No. 123 (revised 2004), Share-Based Payment (SFAS 123(R)), which established standards for the accounting of transactions in which an entity exchanges its equity
instruments for goods or services, and is now referred to as FASB Codification Topic 718, CompensationStock Compensation. Topic 718 focuses primarily on accounting for transactions in which an entity obtains employee services in
share-based payment transactions. Topic 718 requires that the fair value of such equity instruments be recognized as an expense in the financial statements as services are performed.



| | (l) | OPERATING LEASES
| | --- | ----------------

The Company
currently has one facility located at 4 Maguire Road in Lexington, Massachusetts under a noncancellable operating lease agreement for office and laboratory space. The rent payments for this facility escalate over the lease term and the Company
expenses its obligations under this lease agreement on a straight-line basis over the term of the lease (see Note 8(a)). As of December 31, 2010, the Companys facility lease at its 45 Moulton Street, Cambridge, Massachusetts location
terminated.



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| | (m) | CONCENTRATION OF RISK
| | --- | ---------------------

The
Company relies on third parties to supply certain raw materials necessary to produce its drug candidates, including CUDC-101, for preclinical studies and clinical trials. There are a small number of suppliers for certain raw materials that the
Company uses to manufacture its drug candidates.



| | (n) | NEW ACCOUNTING PRONOUNCEMENTS
| | --- | -----------------------------

In January 2010, the FASB issued Accounting Standards Update 2010-06 Fair Value Measurement and Disclosures (Topic 820): Improving
Disclosures about Fair Value Measurements.This guidance provides for the following new required disclosures related to fair value measurements: 1) the amounts of and reasons for significant transfers in and out of level one and level two inputs
and 2) separate presentation of purchases, sales, issuances, and settlements on a gross basis rather than as one net number for level three reconciliations. The guidance also clarifies existing disclosures as follows: 1) provide fair value
measurement disclosures for each class of assets and liabilities and 2) provide disclosures about the valuation techniques and inputs used for both recurring and nonrecurring level two or level three inputs. The new disclosures and clarifications of
existing disclosures were effective for the Company beginning January 1, 2010 and have been included in this annual report. Disclosures about purchases, sales, issuances and settlements in the roll forward of activity for level three fair value
measurements will be effective for the Company beginning January 1, 2011.

In April 2010, the FASB issued Accounting
Standards Update (ASU) No. 2010-17, Revenue RecognitionMilestone Method(ASU 2010-017). ASU 2010-017 provides guidance in applying the milestone method of revenue recognition to research or development arrangements. Under this
guidance management may recognize in its entirety revenue contingent upon the achievement of a milestone, in the period in which the milestone is achieved, only if the milestone meets all the criteria within the guidance to be considered
substantive. This ASU is effective on a prospective basis for research and development milestones achieved in fiscal years beginning on or after June 15, 2010, which is fiscal 2011 for the Company. Early adoption is permitted; however, the
Company plans to implement ASU No. 2010-17 prospectively. As such, the effect of this guidance will be limited to future transactions. The Company does not expect adoption of this standard to have a material impact on its financial position or
results of operations as the Company does not currently have any research and development arrangements which will be accounted for under the milestone method.



|(3) | RESEARCH AND DEVELOPMENT COLLABORATIONS
|--- | ---------------------------------------



| | (a) | GENENTECH, INC. JUNE 2003 COLLABORATION
| | --- | ---------------------------------------



| | (i) | Agreement Summary
| | --- | -----------------

In
June 2003, the Company licensed its proprietary Hedgehog pathway technologies to Genentech for human therapeutic use. The primary focus of the collaborative research plan has been to develop molecules that inhibit the Hedgehog pathway for the
treatment of various cancers. The collaboration is currently focused on the development of GDC-0449, a small molecule Hedgehog pathway inhibitor for the treatment of certain solid tumor cancers. Genentech is currently conducting two clinical trials
with GDC-0449 and several additional clinical trials are ongoing by third parties under a collaboration agreement between Genentech and the National Cancer Institute.

Pursuant to the agreement, Genentech made an up-front payment of $8,500,000, which consisted of a $3,509,000 non-refundable license fee payment and $4,991,000 in exchange for shares of the Companys
common stock. Genentech also made license maintenance fee payments totaling $4,000,000 over the first two years of the collaboration and agreed to make additional contingent cash payments, assuming specified clinical development and regulatory
approval objectives are met. The Company is eligible to receive up to $115,000,000 in contingent cash payments under the collaboration



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for the development of GDC-0449 or another small molecule Hedgehog pathway inhibitor, assuming the successful achievement by Genentech and Roche of specified clinical development and regulatory
objectives, of which it has received $18,000,000 to date. In addition to these payments, the Company is also eligible to receive royalties on sales of any Hedgehog pathway inhibitor products that are successfully commercialized by Genentech and
Roche. For GDC-0449, Curis is entitled to a mid- to high-single digit royalty, which escalates within this range with increasing product sales. In certain specified circumstances, the royalty rate applicable to GDC-0449 may be decreased to a low- to
mid-single digit royalty.

As a result of its licensing agreements with various universities, the Company is obligated to make
payments to these university licensors when certain payments are received from Genentech. As of December 31, 2010, the Company has incurred aggregate expenses of $900,000 in connection with its receipt of contingent cash payments from Genentech
related to such licensing agreements.

The collaboration provides for the development of small molecule and antibody Hedgehog
pathway inhibitors for the treatment of cancer. The development of these programs is governed by a joint steering committee which is comprised of an equal number of representatives from both the Company and Genentech to oversee the research,
development and commercialization and other efforts relating to these programs. Each member of the joint steering committee receives the right to cast one vote, but Genentech has the final decision making authority in most matters. The joint
steering committee was required to meet on at least a quarterly basis until the filing of the first investigational new drug, or IND, application for a Hedgehog pathway inhibitor product candidate, which occurred in October 2006. After such filing,
the joint steering committee shall meet as often as it deems necessary and shall exist as long as any compound under the collaboration is being developed or commercialized in accordance with the contract terms.

Unless terminated earlier, the agreement shall expire six months after the later of the expiration of Genentechs obligation to pay
royalties to the Company under the agreement or such time as no activities have occurred under the agreement for a period of twelve months.



| | (ii) | Accounting Summary
| | ---- | ------------------

The
Company considers its June 2003 arrangement with Genentech to be a revenue arrangement with multiple deliverables. The Companys deliverables under this collaboration include an exclusive license to its Hedgehog pathway inhibitor technologies,
research and development services for the first two years of the collaboration, and participation on the joint steering committee. The Company applied the provisions of FASB Codification Topic 605-25, Revenue Recognition, Multiple Element
Arrangementto determine whether the performance obligations under this collaboration could be accounted for separately or should be accounted for as a single unit of accounting. The Company determined that the deliverables, specifically, the
license, research and development services and steering committee participation, represented a single unit of accounting because the Company believes that the license, although delivered at the inception of the arrangement, did not have stand-alone
value to Genentech without the Companys research and development services and steering committee participation. In addition, objective and reliable evidence of the fair value of the Companys research and development services and steering
committee participation could not be determined. During 2007, the Company reassessed its participation on the joint steering committee and concluded that its participation in the joint steering committee had become inconsequential and perfunctory.
Specifically, the Company believed that its participation on the joint steering committee was no longer essential to the development of Hedgehog pathway inhibitor compounds under the collaboration with Genentech, and the fair value or cost, if any,
of completing the Companys obligation was insignificant in relation to the non-refundable up-front license fee and maintenance payments totaling $7,509,000 received from Genentech that had been allocated to the single unit of accounting.

The Company received payments from Genentech totaling $6,000,000 during each of the years ended December 31, 2009 and
2008 for the achievement of certain clinical development objectives related to



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GDC-0449. As the Company did not have any further performance obligations under the collaboration, the Company has recorded these amounts as revenue within License Fees in the
Revenues section of its Consolidated Statement of Operations for the years ended December 31, 2009 and 2008, respectively. The Company did not receive any such payments for the year ended December 31, 2010. During the years ended
December 31, 2010, 2009 and 2008, the Company also recorded revenue within Research and development of $275,000, $229,000 and $282,000, respectively, as revenue related to expenses incurred on behalf of Genentech that were paid by
the Company and for which Genentech is obligated to reimburse the Company. The Company will continue to recognize revenue for expense reimbursement as such reimbursable expenses are incurred, provided that the provisions of FASB Codification Topic
605-45 are met. As of December 31, 2010, the Company had recorded $71,000 as amounts receivable from Genentech under this collaboration in Accounts receivable in the Companys Current Assets section of its Consolidated Balance
Sheets.



| | (b) | DEBIOPHARM AUGUST 2009 LICENSE AGREEMENT
| | --- | ----------------------------------------



| | (i) | Agreement Summary
| | --- | -----------------

In
August 2009, the Company entered into a license agreement with Debiopharm, pursuant to which the Company has granted to Debiopharm a worldwide, exclusive royalty-bearing license, with the right to grant sublicenses, to develop, manufacture,
market and sell any product containing Curis Hsp90 inhibitor technology, including its lead Hsp90 compound under development, CUDC-305, which Debiopharm has since renamed Debio 0932. Debiopharm has assumed all future development responsibility
and all future costs related to the development, registration and commercialization of products under the agreement.

Pursuant
to the terms of the agreement, the Company used its reasonable commercial efforts to transfer to Debiopharm know how, information and clinical materials necessary for Debiopharm to continue the development of products in accordance with the
development plan outlined in the agreement, all of which were completed as of December 31, 2009. Furthermore, at no cost to Debiopharm, the Company provided a reasonable amount of technical, scientific and intellectual property support to the
development plan, as requested by Debiopharm, during the first six months of the agreement.

Pursuant to the terms of the
agreement, Debiopharm has agreed to undertake reasonable commercial efforts to implement the development plan in the timeframes described in the agreement in order to develop, register and commercialize the product in specified markets and will be
solely responsible for all the costs relating thereto. Debiopharm will retain final decision making authority on all development, commercialization, marketing, manufacturing and regulatory matters relating to the product.

As consideration for the exclusive license rights provided in the agreement, and subject to the terms of the agreement, Debiopharm has
agreed to pay the Company up to an aggregate of $90,000,000 assuming the successful achievement of specified clinical development and regulatory approval objectives consisting of::



| |  |  | a $2,000,000 up-front license fee, which the Company received in September 2009, upon the transfer to Debiopharm of certain information specified in
the agreement;
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | an $8,000,000 payment upon the first regulatory approval in a major market country of an open investigational new drug application in the U.S. or a
clinical trial application in Europe to initiate human clinical trials, which the Company received in March 2010;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | a $3,000,000 payment upon the administration of Debio 0932 in the fifth patient in the first phase I clinical trial, which the Company received in
August 2010; and
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | additional contingent payments assuming the successful achievement of additional specified clinical development and regulatory approval objectives.
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------



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In addition, Debiopharm will pay the Company:



| |  |  | a specified percentage of all sublicensing payments received by Debiopharm and its affiliates from sublicensees;
| | - |  | ----------------------------------------------------------------------------------------------------------------



| |  |  | a specified percentage of royalties Debiopharm and its affiliates receive from sublicensees; and
| | - |  | ------------------------------------------------------------------------------------------------



| |  |  | a specified percentage of royalties on net sales of products by Debiopharm or its affiliates.
| | - |  | ---------------------------------------------------------------------------------------------

The agreement was effective as of August 5, 2009, and unless terminated earlier will expire, on a
country-by-country basis, on the later of (i) the expiration of the last-to-expire valid claim of the Companys patents and joint patents relating to the products, and (ii) the
10thanniversary of the first commercial sale of the
product in such country. Pursuant to the agreement, either party can terminate the agreement upon notice under prescribed circumstances, and the agreement specifies the consequences to each party for such early termination.



| | (ii) | Accounting Summary
| | ---- | ------------------

The
Company considers its arrangement with Debiopharm to be a revenue arrangement with multiple deliverables, or performance obligations. The Companys substantive performance obligations under this collaboration included an exclusive license to
its Hsp90 inhibitor technologies, a reasonable amount of technical, scientific and intellectual property support to the development plan, as requested by Debiopharm, during the first six months of the agreement and participation on a steering
committee for which the Company received a $2,000,000 up-front, nonrefundable license fee. The Company applied the provisions of FASB Codification Topic 605-25, Revenue Recognition, Multiple Element Arrangements, to determine whether the
performance obligations under this collaboration could be accounted for separately or as a single unit or multiple units of accounting. The Company determined that these performance obligations represented a single unit of accounting, since,
initially, the license does not have stand-alone value to Debiopharm without its technical expertise and steering committee participation during the initial six-month period. In addition, objective and reliable evidence of the fair value of the
Companys technical support and steering committee participation could not be determined.

The Company also provided
clinical materials to Debiopharm for which the Company received additional consideration. The Company has determined that this deliverable is a separate unit of accounting from the license and related support, and consideration received would be
recognized as revenue in accordance with our revenue policy. During the year ended December 31, 2009, the Company recorded revenue within Research and development of $532,000 related to such clinical materials expensed by the
Company and purchased by Debiopharm.

The Companys ongoing substantive performance obligations under this collaboration
consist of support to Debiopharm during the initial six months of the agreement and participation on a joint steering committee. The joint steering committee is comprised of four members, two from each company. Debiopharm retains final decision
making authority on all development, commercialization, marketing, manufacturing and regulatory matters relating to any product candidates. The joint steering committees function is limited to facilitation of the collaboration, including
providing a contractual mechanism of information exchange related to the product candidates being developed. The joint steering committee has no authority to make changes to the development plan, which can only be revised by Debiopharm upon advance
notice to the Company. The Company has determined that its joint steering committee obligation is participatory for the initial six-month period in which it is also required to provide technical support. The Companys main contribution during
this time is to support Debiopharms preparation of the clinical trial application filing with regulatory authorities, which was filed in the fourth quarter of 2009. After January 2010, substantially all activities around the implementation and
management of the development plan become the sole responsibility of Debiopharm, at which time, the Company believes that its role on the joint steering committee became



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protective and inconsequential or perfunctory. The Company has therefore estimated that its participation on the joint steering committee should only factor into the performance period as it
relates to the six-month period in which the Company has a participatory role. Because the Company estimated that its level of effort would be consistent over the six-month term of the arrangement, the Company accounted for the arrangement under the
proportional performance method.

The $2,000,000 up-front fee was recognized ratably as the research and joint steering
committee services are being provided over the estimated six-month performance period, through January 2010, at a rate of $333,000 per month. During the years ended December 31, 2010 and 2009, the Company recorded revenue of $333,000 and
$1,667,000, respectively, related to the Companys efforts under the Debiopharm arrangement, which was recorded in License Fees in the Companys Revenues section of its Consolidated Statement of Operations.

The Company believes that contingent payments tied to preclinical, clinical development and drug approval objectives under this
collaboration would not constitute substantive milestones since the successful achievement of these objectives would not meet each of the criteria set forth in the Companys revenue recognition policy related to substantive milestones. For any
contingent payments received by the Company subsequent to the conclusion of the performance period in January 2010, the Company would have no future deliverables under the agreement, and the Company would recognize such contingent payments as
revenue at the time when the objectives are met and payable. The Company earned $8,000,000 under this agreement in March 2010 upon acceptance by French regulatory authorities of Debiopharms clinical trial application for Hsp90 inhibitor, Debio
0932, and $3,000,000 in July 2010 upon Debiopharms treatment of the fifth patient in its ongoing phase I clinical trial. The Company recorded $11,000,000 as revenue within License Fees in the Revenues section of its Condensed
Consolidated Statement of Operations for the year ended December 31, 2010 because the Company has no ongoing material performance obligations under the agreement.



| | (c) | STRYKER
| | --- | -------

On December 27,
2007, the Company completed a transaction with Stryker, under the terms of which Stryker paid the Company $1,750,000 in cash in exchange for the sale and assignment of all of the Companys remaining bone morphogenetic protein (or,
BMP) assets. As a result of the transaction, Stryker assumed all future costs subsequent to the December 27, 2007 effective date related to maintenance and prosecution of the related patent portfolio. The Company completed the
transfer of all assets during the first quarter of 2008, at which time no material ongoing performance obligations remained under the agreement. Accordingly, the Company recorded $1,750,000 as license revenue within the Revenues section of the
Consolidated Statement of Operations for the year ended December 31, 2008. No revenues were recognized under this agreement in 2010 or 2009.

Under the terms of the agreement, the Company is entitled to contingent cash payments related to certain clinical development and sales objectives, if achieved. The Company believes that these contingent
payments would not constitute substantive milestones since the successful achievement of these objectives would not meet each of the criteria set forth in the Companys revenue recognition policy related to substantive milestones. Accordingly,
the Company would recognize such contingent payments as revenue in License Fees in the Companys Revenues section of its Consolidated Statement of Operations when the milestones are met because the Company would has no future
deliverables under the agreement.

In connection with its transaction with Stryker, the Company entered into a separate
agreement in December 2007 with a former collaborator, to which the Company had previously licensed a portion of its BMP technology. In exchange for the rights to transfer the licensed technology to Stryker and to place previously agreed-upon
financial consideration under such transfer, the Company was obligated to make a one-time payment of $750,000 to the former collaborator in 2007. In connection with its receipt of any contingent payments from Stryker, the Company would be required
to make payments of up to



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$14,000,000 to this former third-party collaborator if such payments are made for product candidates or products that are designed to treat certain indications affecting chronic kidney disease
patients.



|(4) | FORMER LICENSEES AND COLLABORATIONS
|--- | -----------------------------------



| | (a) | MICROMET SETTLEMENT
| | --- | -------------------

On
February 4, 2010, the Company entered into a settlement, mutual release and termination agreement with Micromet, Inc. to resolve a claim filed by the Company relating to a June 2001 license agreement between the Company and Micromets
wholly owned subsidiary, Micromet AG, associated with the Companys single chain peptide technology. Under the June 2001 agreement, Micromet AG acquired from the Company certain intellectual property assets relating to single chain antibodies,
including patents and license agreements. Pursuant to the settlement agreement, Micromet made a final payment of $4,000,000 during the first quarter of 2010 to the Company in order to settle the dispute and discharge and terminate all future payment
obligations that would have arisen under the June 2001 Agreement. The Company has recorded the $4,000,000 within the License fee revenue line item in the Consolidated Statement of Operations for the year ended December 31, 2010.
During the first quarter of 2010, the Company incurred approximately $1,526,000 in legal fees and expenses through the settlement date. During the year ended December 31, 2009, the Company had incurred $731,000 related to this matter. These
costs are included within the General and Administrative expense line item of the Consolidated Statement of Operations for the respective periods.



| | (b) | WYETH PHARMACEUTICALS
| | --- | ---------------------



| | (i) | Agreement Summary
| | --- | -----------------

On
January 12, 2004, the Company licensed its Hedgehog proteins and small molecule Hedgehog pathway agonists to Wyeth Pharmaceuticals, or Wyeth, for therapeutic applications in the treatment of neurological and other disorders. Pursuant to the
collaboration agreement, Wyeth agreed to make specified cash payments, including up-front payments of $3,000,000, which consisted of a $1,362,000 non-refundable license fee payment and $1,638,000 in exchange for 315,524 shares of the Companys
common stock.

On May 6, 2008 the agreement terminated. On the termination date, the licenses granted by the Company to
Wyeth terminated and all terminated license rights reverted to the Company.



| | (ii) | Accounting Summary
| | ---- | ------------------

The
Company considered its arrangement with Wyeth to be a revenue arrangement with multiple deliverables, or performance obligations. The Companys performance obligations under this collaboration included an exclusive license to its Hedgehog
agonist technologies and performing services, including research and development services for at least two years and participation on a steering committee. The Company applied the provisions of FASB Codification Topic 605-25, Revenue Recognition,
Multiple Element Arrangements,to determine whether the performance obligations under this collaboration could be accounted for separately or as a single unit or multiple units of accounting. The Company determined that these performance
obligations represented a single unit of accounting, since the Company believed that the license did not have stand-alone value to Wyeth without its research services and steering committee participation and because objective and reliable evidence
of the fair value of the Companys research and steering committee participation could not be determined. Because the Company believed that it could reasonably estimate its level of effort over the term of the arrangement, the Company accounted
for the arrangement under the relative performance method.

The $1,362,000 up-front license fee plus $7,250,000,which
represented the total amount of research funding which the Company was entitled to for providing an average of 7.25 full-time equivalents over the four-year performance period at a rate of $250,000 each (eight full-time equivalents over the first
three years and five full-time equivalents over the last year), was attributed to the research services.



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During the year ended December 31, 2008, the Company recorded revenue of $299,000
related to the Companys research efforts under the Wyeth arrangement, of which $103,000 was recorded in License Fees and $196,000 was recorded in Research and development contracts in the Companys Revenues section
of its Consolidated Statement of Operations. Included within Research and development contracts, the Company recorded $62,000 for the year ended December 31, 2008 as revenue related to expenses incurred on behalf of Wyeth that were
paid by the Company and for which Wyeth is obligated to reimburse the Company. No revenues were recognized under this agreement in 2010 and 2009.



|(5) | STOCK PLANS AND STOCK BASED COMPENSATION
|--- | ----------------------------------------

In the first quarter of 2010, the Companys shareholder-approved, share-based 2000 Stock Incentive Plan expired in accordance with its terms and its 2000 Director Stock Option Plan had no available
shares remaining under the plan. No additional awards will be made under these plans, although all outstanding awards under these plans will remain in effect until they are exercised or they expire in accordance with their terms. As of
December 31, 2009, the Companys 2000 Employee Stock Purchase Plan had no available shares remaining under the plan. New stock plans were approved by shareholders during 2010 as described below.

2010 Stock Incentive Plan

In April 2010, the Board of Directors adopted and, in June 2010, the stockholders approved, the 2010 Stock Incentive Plan, which permits the granting of incentive and non-qualified stock options and stock
awards to employees, officers, directors, and consultants of the Company and its subsidiaries at prices determined by the Companys Board of Directors. The Company can issue up to 6,000,000 shares of its common stock pursuant to awards granted
under the 2010 Stock Incentive Plan. Options become exercisable as determined by the Board of Directors and expire up to 10 years from the date of grant. The 2010 Stock Incentive Plan uses a fungible share concept under which each share
of stock subject to awards granted as options and stock appreciation rights will cause one share per share under the award to be removed from the available share pool, while each share of stock subject to awards granted as restricted stock,
restricted stock units, other stock-based awards or performance awards where the price charged for the award is less than 100% of the fair market value of the Companys common stock will cause 1.22 shares per share under the award to be removed
from the available share pool. As of December 31, 2010, the Company had granted options to purchase 45,000 shares of the Companys common stock, each with an exercise price equal to the closing market price of the Companys common
stock on the NASDAQ Global Market on the grant date. As of December 31, 2010, 5,955,000 shares remained available for grant under the 2010 Stock Incentive Plan.

During the year ended December 31, 2010, the Companys Board of Directors granted options to purchase a total of 892,500 shares of the Companys common stock to officers and employees of
the Company, of which options to purchase 872,500 shares of common stock were granted under the 2000 Stock Incentive Plan prior to its expiration and options to purchase 20,000 shares of common stock were granted under the 2010 Stock Incentive Plan.
These options vest over a four-year period and bear exercise prices that are equal to the closing market price of the Companys common stock on the NASDAQ Global Market on the grant date.

During the year ended December 31, 2010, the Companys Board of Directors also granted options to its non-employee directors to
purchase 235,000 shares of common stock under the 2000 and 2010 Stock Incentive Plans. Of this amount, options to purchase 210,000 shares of common stock were granted under the 2000 Stock Incentive Plan prior to its expiration, were fully vested on
the February 2, 2010 grant date and bear exercise prices that are equal to the closing market price of the Companys common stock on the NASDAQ Global Market on the date of grant. The remaining options to purchase 25,000 shares of common
stock were granted under the 2010 Stock Incentive Plan to a newly appointed



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director and will vest over a four-year period and bear an exercise price that is equal to the closing market price of the Companys common stock on the NASDAQ Global Market on the
June 3, 2010 grant date.

Employee and Director Grants

In determining the fair value of stock options, the Company uses the Black-Scholes option pricing model. The Black-Scholes option pricing
model employs the following key assumptions for employee option grants issued in each of the following years:



|                                |  |                                 |         |   |      |  |         |      |  |  |         |  
|------------------------------- |  | ------------------------------- | ------- | - | ---- |  | ------- | ---- |  |  | ------- | -
|                                |  | For the Year Ended December 31, |        
|                                |  | 2010                            |         |   | 2009 |  |         | 2008 | 
|Expected term (years)Employees |  |                                 | 6.0     |   |      |  | 6.0     |      |  |  | 3.0-6.0 |  
|Expected term (years)Directors |  |                                 | 6.0     |   |      |  | 6.0     |      |  |  | 7.0     |  
|Risk-free interest rate         |  |                                 | 2.3-2.8 | % |      |  | 2.1-2.6 | %    |  |  | 1.7-3.4 | %
|Expected volatility             |  |                                 | 69-73   | % |      |  | 67-82   | %    |  |  | 71-93   | %
|Expected dividend yield         |  |                                 | None    |   |      |  | None    |      |  |  | None    |  

The expected
volatility is based on the annualized daily historical volatility of the Companys stock price through the end of the reporting period for a time period consistent with the expected term of a grant. Management believes that the historical
volatility of the Companys stock price best represents the volatility of the stock price. The risk-free rate is based on the U.S. Treasury yield curve in effect at the time of grant. The Company does not anticipate declaring dividends in the
foreseeable future.

The stock price volatility and expected terms utilized in the calculation involve managements best
estimates at that time, both of which impact the fair value of the option calculated under the Black-Scholes methodology and, ultimately, the expense that will be recognized over the life of the option. GAAP also requires that the Company recognize
compensation expense for only the portion of options that are expected to vest. Therefore, management calculated an estimated annual pre-vesting forfeiture rate that is derived from historical employee termination behavior since the inception of the
Company, as adjusted. If the actual number of forfeitures differs from those estimated by management, additional adjustments to compensation expense may be required in future periods.

At December 31, 2010, the aggregate intrinsic value of employee options outstanding was $4,358,000, of which $3,596,000 related to
exercisable options, and the weighted average remaining contractual life of vested stock options was 5.42 years. The weighted average grant-date fair values of stock options granted during the years ended December 31, 2010, 2009 and 2008 were
$1.46, $0.82 and $0.91, respectively. As of December 31, 2010, there was approximately $1,867,000, including the impact of estimated forfeitures, of unrecognized compensation cost related to unvested employee stock option awards outstanding
under the Companys 2000 and 2010 Stock Incentive Plans that is expected to be recognized as expense over a weighted average period of 2.1 years. The intrinsic value of employee stock options exercised during the years ended December 31,
2010, 2009 and 2008 were $154,000, $515,000 and $38,000, respectively. The total fair value of vested stock options for the years ended December 31, 2010, 2009 and 2008 were $2,219,000, $1,593,000 and $2,003,000, respectively.

Non-Employee Grants

The Company has periodically granted stock options to consultants for services. These options were issued at or above their fair market value on the date of grant and have various vesting dates from date
of grant, ranging from 3.5 months to 4 years. Should the Company or the consultant terminate the consulting agreement, any unvested options will be cancelled. Unvested non-employee options are marked-to-market, which means that as the Companys
stock price fluctuates, the related expense either increases or decreases. The Company reversed expense of $12,000 related to non-employee stock options and stock awards for the years ended December 31, 2010. The Company recognized



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expense of $104,000 and $24,000 related to non-employee stock options and stock awards for the years ended December 31, 2009 and 2008, respectively. As of December 31, 2010, the Company
had recorded $1,000 in deferred compensation related to unvested non-employee options.

A summary of stock option activity
under 2010 Stock Incentive Plan, the 2000 Stock Incentive Plan and the 2000 Director Stock Option Plan is summarized as follows:



|                                                                                                    |  |                 |            |   |                                       |   |       | 
|--------------------------------------------------------------------------------------------------- |  | --------------- | ---------- | - | ------------------------------------- | - | ----- | 
|                                                                                                    |  | Number ofShares |            |   | WeightedAverageExercisePrice perShare |  
|Outstanding, December 31, 2009 (8,068,622 exercisable at weighted average price of $2.95 per share) |  |                 | 11,141,831 |   |                                       | $ | 2.50  | 
|Granted                                                                                             |  |                 | 1,127,500  |   |                                       |   | 2.24  | 
|Exercised                                                                                           |  |                 | (198,370   | ) |                                       |   | 1.34  | 
|Cancelled                                                                                           |  |                 | (533,211   | ) |                                       |   | 10.60 | 
|                                                                                                    |  |                 |            |   |                                       |   |       | 
|Outstanding, December 31, 2010 (9,524,572 exercisable at weighted average price of $2.20 per share) |  |                 | 11,537,750 |   |                                       | $ | 2.12  | 
|                                                                                                    |  |                 |            |   |                                       |   |       | 
|Vested and unvested expected to vest                                                                |  |                 | 11,519,693 |   |                                       | $ | 2.12  | 

The table below
summarizes options outstanding and exercisable at December 31, 2010:



|                     |  |                     |            |  |                                                    |  |      |                                        |  |   |                 |  |  |                                        |           |  |  |   |      | 
|-------------------- |  | ------------------- | ---------- |  | -------------------------------------------------- |  | ---- | -------------------------------------- |  | - | --------------- |  |  | -------------------------------------- | --------- |  |  | - | ---- | 
|                     |  | Options Outstanding |            |  | Options Exercisable                                | 
|Exercise Price Range |  | Number ofShares     |            |  | WeightedAverageRemainingContractualLife (in years) |  |      | WeightedAverageExercise Priceper Share |  |   | Number ofShares |  |  | WeightedAverageExercise Priceper Share |          
|$0.79 - $1.20        |  |                     | 1,944,880  |  |                                                    |  | 7.25 |                                        |  | $ | 1.00            |  |  |                                        | 1,382,058 |  |  | $ | 0.98 | 
|1.27 -   1.39        |  |                     | 1,925,979  |  |                                                    |  | 6.47 |                                        |  |   | 1.38            |  |  |                                        | 1,780,316 |  |  |   | 1.38 | 
|1.43 -   1.57        |  |                     | 2,660,720  |  |                                                    |  | 5.26 |                                        |  |   | 1.50            |  |  |                                        | 2,360,652 |  |  |   | 1.51 | 
|1.67 -   2.43        |  |                     | 2,486,126  |  |                                                    |  | 6.02 |                                        |  |   | 2.26            |  |  |                                        | 1,512,501 |  |  |   | 2.27 | 
|2.48 -   4.56        |  |                     | 2,196,045  |  |                                                    |  | 2.72 |                                        |  |   | 3.94            |  |  |                                        | 2,165,045 |  |  |   | 3.94 | 
|4.72 -   5.89        |  |                     | 324,000    |  |                                                    |  | 2.46 |                                        |  |   | 5.02            |  |  |                                        | 324,000   |  |  |   | 5.02 | 
|                     |  |                     |            |  |                                                    |  |      |                                        |  |   |                 |  |  |                                        |           |  |  |   |      | 
|                     |  |                     | 11,537,750 |  |                                                    |  | 5.40 |                                        |  | $ | 2.12            |  |  |                                        | 9,524,572 |  |  | $ | 2.20 | 
|                     |  |                     |            |  |                                                    |  |      |                                        |  |   |                 |  |  |                                        |           |  |  |   |      | 

2010 Employee Stock Purchase Plan

In April 2010, the Board of Directors adopted and, in June 2010, the stockholders approved, the 2010 Employee Stock Purchase Plan, or the
ESPP. The Company has reserved 500,000 of its shares of common stock for issuance under the ESPP. Eligible employees may purchase shares of the Companys common stock at 85% of the lower closing market price of the common stock at the beginning
or ending date of the purchase period, as defined. The Company has two six-month purchase periods per year, with the initial purchase period under the plan commencing on June 15, 2010 and ending on December 14, 2010. During the year ended
December 31, 2010, 53,472 shares were issued under the ESPP and there were 446,528 shares available for future purchase under the ESPP.



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For the years ended December 31, 2010, 2009 and 2008, the Company recorded compensation
expense related to its ESPP and calculated the fair value of shares expected to be purchased under the ESPP using the Black-Scholes model with the following assumptions:



|                                           |  |                                 |          |   |      |   |          |      |  |   |          |  
|------------------------------------------ |  | ------------------------------- | -------- | - | ---- | - | -------- | ---- |  | - | -------- | -
|                                           |  | For the Year Ended December 31, |         
|                                           |  | 2010                            |          |   | 2009 |   |          | 2008 | 
|Compensation expense recognized under ESPP |  | $                               | 51,000   |   |      | $ | 72,000   |      |  | $ | 73,000   |  
|Expected term                              |  |                                 | 6 months |   |      |   | 6 months |      |  |   | 6 months |  
|Risk-free interest rate                    |  |                                 | 0-0.2    | % |      |   | 0-0.3    | %    |  |   | 0-1.9    | %
|Volatility                                 |  |                                 | 85-120   | % |      |   | 70-86    | %    |  |   | 75-86    | %
|Dividends                                  |  |                                 | None     |   |      |   | None     |      |  |   | None     |  

Stock-based
compensation for employee and director stock option grants for the years ended December 31, 2010, 2009 and 2008 of $1,979,000, $1,750,000 and $2,182,000, respectively, was calculated using the above valuation models and has been included in the
Companys results of operations. Certain stock options to purchase a total of 816,500 shares of the Companys common stock were issued to employees of the Company in 2008 and 2007 in which vesting was tied to a performance condition. These
options immediately vested upon the consummation of a collaboration, licensing or other similar agreement regarding programs under the Companys network-targeted cancer programs that included an up-front cash payment of at least $10,000,000
excluding any equity investment in the Company and subject to the employees continued employment. The Companys Compensation Committee of its Board of Directors determined that the performance condition underlying these options was met in
conjunction with the Debiopharm licensing agreement (see Note 4(b)). Receipt of the March 2010 payment from Debiopharm resulted in the immediate vesting of these options and the Company recorded approximately $485,000 in stock compensation expense
related to the acceleration of vesting of the underlying options during the year ended December 31, 2010. No income tax benefit has been recorded as the Company has recorded a full valuation allowance and management has concluded that it is not
likely that the net deferred tax asset will be realized (see Note 10).

Total Stock-Based
Compensation Expense

For the years ended December 31, 2010, 2009 and 2008, the Company recorded employee and
non-employee stock-based compensation expense to the following line items in its Costs and Expenses section of the Consolidated Statements of Operations and Comprehensive Loss:



|                                       |  |                                 |           |  |      |   |           |      |  |   |           | 
|-------------------------------------- |  | ------------------------------- | --------- |  | ---- | - | --------- | ---- |  | - | --------- | 
|                                       |  | For the Year ended December 31, |          
|                                       |  | 2010                            |           |  | 2009 |   |           | 2008 | 
|Research and development expenses      |  | $                               | 663,000   |  |      | $ | 688,000   |      |  | $ | 743,000   | 
|General and administrative expenses    |  |                                 | 1,304,000 |  |      |   | 1,166,000 |      |  |   | 1,463,000 | 
|                                       |  |                                 |           |  |      |   |           |      |  |   |           | 
|Total stock-based compensation expense |  | $                               | 1,967,000 |  |      | $ | 1,854,000 |      |  | $ | 2,206,000 | 
|                                       |  |                                 |           |  |      |   |           |      |  |   |           | 



|(6) | PROPERTY AND EQUIPMENT
|--- | ----------------------

Property and equipment consist of the following:



|                                               |  |              |            |   |      |   |            |  
|---------------------------------------------- |  | ------------ | ---------- | - | ---- | - | ---------- | -
|                                               |  | December 31, |           
|                                               |  | 2010         |            |   | 2009 |  
|Laboratory equipment, computers and software   |  | $            | 2,680,000  |   |      | $ | 3,203,000  |  
|Leasehold improvements                         |  |              | 18,000     |   |      |   | 6,258,000  |  
|Office furniture and equipment                 |  |              | 307,000    |   |      |   | 307,000    |  
|                                               |  |              |            |   |      |   |            |  
|                                               |  |              | 3,005,000  |   |      |   | 9,768,000  |  
|LessAccumulated depreciation and amortization |  |              | (2,702,000 | ) |      |   | (9,053,000 | )
|                                               |  |              |            |   |      |   |            |  
|Total                                          |  | $            | 303,000    |   |      | $ | 715,000    |  
|                                               |  |              |            |   |      |   |            |  



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The Company recorded depreciation and amortization expense of $686,000, $751,000 and
$999,000 for the years ended December 31, 2010, 2009 and 2008, respectively.

During the years ended December 31,
2010 and 2009, the Company identified certain of its fully depreciated assets that were no longer being used. As a result, the Company wrote off gross assets and related accumulated depreciation, totaling $7,038,000 and $857,000, for the years ended
December 31, 2010 and 2009, respectively. Of the fully depreciated assets written off during the year ended December 31, 2010, $6,407,000 related to leasehold improvements and fixtures at the 45 Moulton Street facility that the Company
vacated in December 2010 at the end of its lease term.

The Company continues to review its estimate of remaining useful lives
related to assets currently being used on the Companys remaining programs. Any future changes to the estimated useful lives of the Companys assets could have a material impact on its financial statements.



|(7) | ACCRUED LIABILITIES
|--- | -------------------

Accrued liabilities consist of the following:



|                       |  |              |         |  |      |   |           | 
|---------------------- |  | ------------ | ------- |  | ---- | - | --------- | 
|                       |  | December 31, |        
|                       |  | 2010         |         |  | 2009 |  
|Accrued compensation   |  | $            | 539,000 |  |      | $ | 501,000   | 
|Professional fees      |  |              | 143,000 |  |      |   | 157,000   | 
|Facility-related costs |  |              | 34,000  |  |      |   | 194,000   | 
|Other                  |  |              | 139,000 |  |      |   | 157,000   | 
|                       |  |              |         |  |      |   |           | 
|Total                  |  | $            | 855,000 |  |      | $ | 1,009,000 | 
|                       |  |              |         |  |      |   |           | 



|(8) | COMMITMENTS
|--- | -----------



| | (a) | OPERATING LEASES
| | --- | ----------------

Effective
September 16, 2010, the Company entered into a lease agreement with the Trustees of Lexington Office Realty Trust pursuant to which the Company agreed to lease 24,529 square feet of property to be used for office, research and laboratory
located at 4 Maguire Road in Lexington, Massachusetts. The Company lease for its prior headquarters at 45 Moulton Street, Cambridge, Massachusetts expired on December 31, 2010.

The term of the 4 Maguire Road lease agreement commenced on December 1, 2010, and expires on January 31, 2018. The Company has
the option to extend the term for one additional five-year period upon the Companys written notice to the lessor at least one year and no more than 18 months in advance of the extension. The Company also has the option to terminate the lease
agreement after three years, referred to as the early termination option, upon the Companys written notice to the lessor no later than the second anniversary of the rent commencement date as defined in the lease agreement. Concurrently with
such notice, the Company is required to pay a termination fee to the lessor equal to the sum of two months base rent at the rate for the third year of the term and 65.46% of the value of certain transaction expenses incurred by the lessor. The
maximum fee for exercising this early termination option is $772,000.

The total cash obligation for the base rent over the
initial term of the lease agreement is approximately $4,401,000. In addition to the base rent, the Company is also responsible for its share of operating expenses and real estate taxes, in accordance with the terms of the lease agreement. The
Company has provided a security deposit to the lessor in the form of an irrevocable letter of credit in the amount of $278,000, and has classified this amount as a restricted long-term investment in the Companys Consolidated Balance Sheet as
of December 31, 2010. The security deposit may be reduced by up to $125,000 over time in accordance with the terms of the lease agreement. The lessor paid $789,000 for certain upgrades and repairs that were made to the leased property prior to
the commencement date. The Company has not recognized these improvements as its assets as of December 31, 2010.



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If the Company is considered in default under the terms of the lease agreement and fails to
cure such default in the applicable time period, the lessor may terminate the lease agreement and the Company will be required to pay the difference between the remaining rent payments through the expiration of the lease agreement and any rental
income from reletting the leased property over such time period, after deducting any expenses incurred in connection with such reletting. Circumstances which may be considered a default under the lease agreement include the failure to timely pay any
rent obligations and the filing by the Company of a petition for liquidation or reorganization under bankruptcy law.

The
Companys remaining operating lease commitments for all leased facilities with an initial or remaining term of at least one year are as follows:



|                         |  |   |           | 
|------------------------ |  | - | --------- | 
|Year Ending December 31, |  |   |          
|2011                     |  | $ | 509,000   | 
|2012                     |  |   | 578,000   | 
|2013                     |  |   | 602,000   | 
|2014                     |  |   | 627,000   | 
|2015                     |  |   | 651,000   | 
|Thereafter               |  |   | 1,434,000 | 
|                         |  |   |           | 
|Total minimum payments   |  | $ | 4,401,000 | 
|                         |  |   |           | 

Rent expense for all operating leases was $827,000, $776,000 and $776,000 for the years ended
December 31, 2010, 2009 and 2008, respectively. Rent expense for the year ended December 31, 2010 includes rent for two locations during December 2010 as the Company relocated its operations.



| | (b) | LICENSE AGREEMENTS
| | --- | ------------------

In exchange
for the right to use licensed technology in its research and development efforts, the Company has entered into various license agreements. These agreements generally stipulate that the Company pay an annual license fee and is obligated to pay
royalties on future revenues, if any, resulting from use of the underlying licensed technology. Such revenues may include, for example, up-front license fees, contingent payments upon collaborators achievement of development and regulatory
objectives, and royalties. In addition, some of the agreements commit the Company to make contractually defined payments upon the attainment of scientific or clinical milestones. The Company expenses these payments as incurred and expects to expense
royalty payments as related future product sales, if any, are recorded. The Company accrues expenses for scientific and clinical objectives over the period that the work required to meet the respective objective is completed, provided that the
Company believes that the achievement of such objective is probable. The Company incurred license fee expenses within the Research and development line item of its Costs and expenses section of its Consolidated Statement of
Operations for the years ended December 31, 2010, 2009 and 2008, of $243,000, $193,000 and $165,000, respectively.



|(9) | COMMON STOCK AND WARRANT LIABILITY
|--- | ----------------------------------

On January 27, 2010, the Company completed a registered direct offering of 6,449,288 units with each unit consisting of (i) one share of the Companys common stock and (ii) one warrant
to purchase 0.25 of one share of common stock at a purchase price of $2.52 per unit. The Company received net proceeds from the sale of the units, after deducting offering expenses, of approximately $14,942,000.

In connection with this offering, the Company issued warrants to purchase an aggregate of 1,612,322 shares of common stock. The warrants
have an initial exercise price of $3.55 per share and a five-year term. The warrants include certain protective features for the benefit of the warrantholder, including an exercise price adjustment clause and a possible cash-settlement option in the
event of a change of control until the later to occur of (i) two years from the date of original issuance of the warrant and



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(ii) the date upon which Genentech or Roche submits a new drug application (NDA) for GDC-0449. Due to these terms, the warrants were deemed to be a liability and, therefore, the fair value
of the warrants was recorded as a liability in the Condensed Consolidated Balance Sheet as of December 31, 2010. The Company estimated that the fair value of the warrants at issuance was $2,181,000 using a Black-Scholes option pricing model
under various probability-weighted outcomes which take into consideration the protective, but limited, cash-settlement feature of the warrants with the following assumptions assigned to the varying outcomes: expected volatilities of 69.8% and 80%,
risk free interest rates ranging from 1.42% to 2.38%, expected lives of three to five years and no dividends. The Company estimated that the fair value of the warrants at December 31, 2010 was $1,605,000 using this same model with the following
assumptions assigned to the varying outcomes: expected volatilities of 77.1% and 91.5%, risk free interest rates ranging from 1.0% to 1.6%, expected lives of three to four years and no dividends. The warrants will be revalued each reporting period
with updated assumptions, and the resulting change in fair value of the warrant liability will be recognized in the Consolidated Statement of Operations. The Company recorded other income of $576,000 for the year ended December 31, 2010, as a
result of a change in the fair value of the warrant liability that was primarily due to a decrease in the Companys stock price since issuance of the warrants. As of December 31, 2010, these warrants are the only remaining warrants
outstanding.

As of December 31, 2009, the Company had warrants outstanding to purchase an aggregate of 1,742,671 shares
of its common stock at an exercise price of $1.02 per share under its August 2007 private placement, all of which had been accounted for within stockholders equity. During the year ended December 31, 2010, the Company received proceeds of
$1,778,000 upon the exercise of all of these remaining outstanding warrants. During the year ended December 31, 2009, certain of the warrants issued under the August 2007 private placement were exercised to purchase an aggregate of 3,028,188
shares of the Companys common stock, providing approximately $3,089,000 in cash proceeds to the Company.



|(10) | INCOME TAXES
|---- | ------------

For the
years ended December 31, 2010, 2009 and 2008, the Company did not record any federal or state income tax expense given its continued operating losses. The Company received federal tax grants of $489,000 for the year ended December 31, 2010
under the Patient Protection and Affordable Care Act of 2010. The Company does not have any ongoing obligations under these awards and it does not expect to receive any future payments related to these grants. As a result, the Company recorded the
proceeds as Other income in its Consolidated Statement of Operations for the year ended December 31, 2010. The grant proceeds are non-taxable on the federal and state level.

The provision for income taxes for continuing operations was at rates different from the U.S. federal statutory income tax rate for the
following reasons:



|                                               |  |                                |       |    |      |  |       |      |  |  |       |   
|---------------------------------------------- |  | ------------------------------ | ----- | -- | ---- |  | ----- | ---- |  |  | ----- | --
|                                               |  | For the Year EndedDecember 31, |      
|                                               |  | 2010                           |       |    | 2009 |  |       | 2008 | 
|Statutory federal income tax rate              |  |                                | 34.0  | %  |      |  | 34.0  | %    |  |  | 34.0  | % 
|State income taxes, net of federal benefit     |  |                                | 5.0   | %  |      |  | 6.0   | %    |  |  | 5.7   | % 
|Research and development tax credits           |  |                                | 8.7   | %  |      |  | 2.6   | %    |  |  | 3.3   | % 
|Deferred compensation                          |  |                                | (4.0  | %) |      |  | (1.6  | %)   |  |  | (3.2  | %)
|NOL expirations                                |  |                                | (58.4 | %) |      |  | (36.1 | %)   |  |  | (53.7 | %)
|Effect of change in state rate                 |  |                                |      | %  |      |  | (11.9 | %)   |  |  |      | % 
|Other                                          |  |                                | (1.5  | %) |      |  | (1.5  | %)   |  |  | (2.6  | %)
|Net increase (decrease) in valuation allowance |  |                                | 16.2  | %  |      |  | 8.5   | %    |  |  | 16.5  | % 
|                                               |  |                                |       |    |      |  |       |      |  |  |       |   
|Effective income tax rate                      |  |                                |      | %  |      |  |      | %    |  |  |      | % 
|                                               |  |                                |       |    |      |  |       |      |  |  |       |   



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Deferred tax assets and deferred tax liabilities are recognized based on temporary
differences between the financial reporting and tax basis of assets and liabilities using future expected enacted rates. A valuation allowance is recorded against deferred tax assets if it is more likely than not that some or all of the deferred tax
assets will not be realized.

The principle components of the Companys deferred tax assets at December 31, 2010 and
2009, respectively are as follows:



|                                                  |  |              |              |   |      |   |              |  
|------------------------------------------------- |  | ------------ | ------------ | - | ---- | - | ------------ | -
|                                                  |  | December 31, |             
|                                                  |  | 2010         |              |   | 2009 |  
|Deferred Tax Assets:                              |  |              |              |   |      |   |              |  
|Net operating loss carryforwards                  |  | $            | 69,997,000   |   |      | $ | 69,825,000   |  
|Research and development tax credit carryforwards |  |              | 10,296,000   |   |      |   | 9,944,000    |  
|Depreciation and amortization                     |  |              | 233,000      |   |      |   | 1,899,000    |  
|Capitalized research and development expenditures |  |              | 22,419,000   |   |      |   | 22,837,000   |  
|Deferred revenue                                  |  |              |             |   |      |   | 187,000      |  
|Impairment of investments                         |  |              | 102,000      |   |      |   | 121,000      |  
|Stock options                                     |  |              | 2,594,000    |   |      |   | 2,171,000    |  
|Accrued expenses and other                        |  |              | 699,000      |   |      |   | 64,000       |  
|                                                  |  |              |              |   |      |   |              |  
|Total Gross Deferred Tax Asset                    |  |              | 106,340,000  |   |      |   | 107,048,000  |  
|Valuation Allowance                               |  |              | (106,340,000 | ) |      |   | (107,048,000 | )
|                                                  |  |              |              |   |      |   |              |  
|Net Deferred Tax Asset                            |  | $            |             |   |      | $ |             |  
|                                                  |  |              |              |   |      |   |              |  

The classification of the above deferred tax assets is as follows:



|                                |  |              |              |   |      |   |              |  
|------------------------------- |  | ------------ | ------------ | - | ---- | - | ------------ | -
|                                |  | December 31, |             
|                                |  | 2010         |              |   | 2009 |  
|Deferred Tax Assets:            |  |              |              |   |      |   |              |  
|Current deferred tax assets     |  | $            | 693,000      |   |      | $ | 245,000      |  
|Non-current deferred tax assets |  |              | 105,647,000  |   |      |   | 106,803,000  |  
|Valuation Allowance             |  |              | (106,340,000 | ) |      |   | (107,048,000 | )
|                                |  |              |              |   |      |   |              |  
|Net Deferred Tax Asset          |  | $            |             |   |      | $ |             |  
|                                |  |              |              |   |      |   |              |  

As of December 31, 2010, the Company had federal and state net operating losses, or NOLs, of
$198,726,000 and $46,032,000, respectively, and federal and state research and experimentation credit carryforwards of approximately $8,379,000 and $2,903,000, respectively, which will expire at various dates starting in 2011 through 2030. The
Company had $6,121,000 of federal net operating losses generated in 1995 and $8,988,000 of Massachusetts net operating losses generated in 2005 that expired in 2010. As required by GAAP, the Companys management has evaluated the positive and
negative evidence bearing upon the realizability of its deferred tax assets, and has determined that it is not more likely than not that the Company will recognize the benefits of the deferred tax assets. Accordingly, a valuation allowance of
approximately $106,340,000 has been established at December 31, 2010. The benefit of deductions from the exercise of stock options is included in the NOL carryforwards. The benefit from these deductions will be recorded as a credit to
additional paid-in capital if and when realized through a reduction of cash taxes.

Utilization of the NOL and R&D credit
carryforwards may be subject to a substantial annual limitation under Section 382 of the Internal Revenue Code of 1986 due to ownership change limitations that have occurred previously or that could occur in the future. These ownership changes
may limit the amount of NOL and R&D credit carryforwards that can be utilized annually to offset future taxable income and tax, respectively. The Company has not completed a study to assess whether a change of control has occurred or whether
there have been multiple changes of control since the Companys formation



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because the Company continues to maintain a full valuation allowance on its NOL and R&D credit carryforwards. In addition, there could be additional ownership changes in the future, which may
result in additional limitations in the utilization of the carryforward NOLs and credits, and the Company does not expect to have any taxable income for the foreseeable future.

An individual tax position must satisfy for some or all of the benefits of that position to be recognized in a companys financial statements. At December 31, 2010 and 2009, the Company had no
unrecognized tax benefits. The Company has not, as yet, conducted a study of its research and development credit carryforwards. This study may result in an adjustment to the Companys research and development credit carryforwards, however,
until a study is completed and any adjustment is known, no amounts are being presented as an uncertain tax position under Topic 740. A full valuation allowance has been provided against the Companys research and development credits and, if an
adjustment is required, this adjustment would be offset by an adjustment to the valuation allowance. Thus, there would be no impact to the consolidated balance sheet or statement of operations if an adjustment were required.

The tax years 1996 through 2010 remain open to examination by major taxing jurisdictions to which the Company is subject, which are
primarily in the United States (U.S.), as carryforward attributes generated in years past may still be adjusted upon examination by the Internal Revenue Service (IRS) or state tax authorities if they have or will be used in a
future period. The Company is currently not under examination by the Internal Revenue Service or any other jurisdictions for any tax years. The Company recognizes both accrued interest and penalties related to unrecognized benefits in income tax
expense. The Company has not recorded any interest and penalties on any unrecognized tax benefits since its inception.



|(11) | RETIREMENT SAVINGS PLAN
|---- | -----------------------

The Company has a 401(k) retirement savings plan covering substantially all of the Companys employees. Matching Company
contributions are at the discretion of the Board of Directors. For the years ended December 31, 2010 and 2009, the Board of Directors authorized matching contributions of $103,000 and $249,000, respectively. The Board of Directors did not
authorize matching contributions for the year ended December 31, 2008.



|(12) | RELATED PARTY TRANSACTIONS
|---- | --------------------------

On September 14, 2006, the Company and Dr. Davie, a member of the Companys board of directors, entered into a Scientific
Advisory and Consulting Agreement pursuant to which Dr. Davie agreed to serve as Chairman of the Companys Scientific Advisory Board, or SAB, as amended on June 3, 2010, when Dr. Davie stepped down as Chairman of the SAB but
remained a contributing member. The term of this agreement is for a period of five years and either party may terminate this agreement by providing thirty days written notice to the other party. In consideration for the services rendered by
Dr. Davie to the Company in his capacity as Chairman of the SAB, the Company initially agreed to pay Dr. Davie an annual retainer of $25,000. Such retainer became effective on June 19, 2007. The agreement was amended on June 3,
2010, after which the Company agreed to pay Dr. Davie on an hourly basis for his services as a member of the SAB. For the years ended December 31, 2010, 2009 and 2008, the Company incurred $14,000, $25,000 and $25,000, respectively, in
Scientific Advisory Board services provided by Dr. Davie. As of December 31, 2010, $4,000 was included in Accounts payable in the Companys Consolidated Balance Sheet.

In connection with the Scientific Advisory Board agreement, the Board also granted to Dr. Davie an option, pursuant to the 2000 Plan,
to purchase 35,000 shares of common stock of the Company at an exercise price equal to $1.72, which was the closing price of the common stock of the Company on the NASDAQ Global Market on September 14, 2006, the date of grant. These options
vested quarterly over a four-year period and became fully vested in September 2010.



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|(13) | SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)
|---- | ---------------------------------------------

The following are selected quarterly financial data for the years ended December 31, 2010 and 2009:



|                                                             |  |               |            |  |              |   |            |                   |  |   |                  |   |  |   |            |  
|------------------------------------------------------------ |  | ------------- | ---------- |  | ------------ | - | ---------- | ----------------- |  | - | ---------------- | - |  | - | ---------- | -
|                                                             |  | Quarter Ended |           
|                                                             |  | March 31,2010 |            |  | June 30,2010 |   |            | September 30,2010 |  |   | December 31,2010 |  
|Revenues                                                     |  | $             | 12,558,334 |  |              | $ | 98,634     |                   |  | $ | 3,242,310        |   |  | $ | 100,287    |  
|Income (loss) from operations                                |  |               | 5,664,085  |  |              |   | (3,926,485 | )                 |  |   | (1,764,985       | ) |  |   | (5,610,359 | )
|Income (loss) applicable to common stockholders              |  |               | 4,784,265  |  |              |   | (2,097,987 | )                 |  |   | (1,514,799       | ) |  |   | (5,606,789 | )
|Basic net income (loss) per share                            |  | $             | 0.07       |  |              | $ | (0.03      | )                 |  | $ | (0.02            | ) |  | $ | (0.07      | )
|Diluted net income (loss) per share                          |  | $             | 0.06       |  |              | $ | (0.03      | )                 |  | $ | (0.02            | ) |  | $ | (0.07      | )
|Shares used in computing basic net income (loss) per share   |  |               | 72,889,133 |  |              |   | 75,617,858 |                   |  |   | 75,623,465       |   |  |   | 75,668,337 |  
|Shares used in computing diluted net income (loss) per share |  |               | 76,282,898 |  |              |   | 75,617,858 |                   |  |   | 75,623,465       |   |  |   | 75,668,337 |  
|                                                             |  |               |            | 
|                                                             |  | March 31,2009 |            |  | June 30,2009 |   |            | September 30,2009 |  |   | December 31,2009 |  
|Revenues                                                     |  | $             | 6,037,127  |  |              | $ | 63,263     |                   |  | $ | 765,313          |   |  | $ | 1,724,237  |  
|Income (loss) from operations                                |  |               | 1,025,994  |  |              |   | (4,247,658 | )                 |  |   | (4,097,159       | ) |  |   | (2,726,087 | )
|Income (loss) applicable to common stockholders              |  |               | 1,125,059  |  |              |   | (4,181,386 | )                 |  |   | (4,060,296       | ) |  |   | (2,705,978 | )
|Basic and diluted net income (loss) per share                |  | $             | 0.02       |  |              | $ | (0.07      | )                 |  | $ | (0.06            | ) |  | $ | (0.04      | )
|Shares used in computing basic net income (loss) per share   |  |               | 63,595,755 |  |              |   | 63,654,519 |                   |  |   | 66,270,778       |   |  |   | 66,673,878 |  
|Shares used in computing diluted net income (loss) per share |  |               | 68,455,453 |  |              |   | 63,654,519 |                   |  |   | 66,270,778       |   |  |   | 66,673,878 |  

The net loss amount
presented above for the quarter ending December 31, 2010 includes $489,000 of other income which represents federal tax grants that the Company received under the Patient Protection and Affordable Care Act of 2010 to support ongoing clinical
and preclinical development activities related to its CUDC-101 and our other network-targeted cancer programs. The Company does not have any ongoing obligations under these awards and it does not expect to receive any future payments related to
these grants.

The net loss amount presented above for the quarter ending December 31, 2009 includes $1,000,000 of license
revenue recognized under the Debiopharm August 2009 license agreement.



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|ITEM 9. | CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE
|------- | ------------------------------------------------------------------------------------

None.



|ITEM 9A. | CONTROLS AND PROCEDURES
|-------- | -----------------------

Evaluation of Disclosure Controls & Procedures

Our management, with the participation of our chief executive officer and chief financial officer, evaluated the effectiveness of our disclosure controls and procedures as of December 31, 2010. The
term disclosure controls and procedures, as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act, means controls and other procedures of a company that are designed to ensure that information required to be disclosed by us in
the reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SECs rules and forms. Disclosure controls and procedures include, without limitation, controls
and procedures designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is accumulated and communicated to the companys management, including its principal
executive and principal financial officers, as appropriate to allow timely decisions regarding required disclosure. Management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable
assurance of achieving their objectives and management necessarily applies its judgment in evaluating the cost-benefit relationship of possible controls and procedures. Based on the evaluation of our disclosure controls and procedures as of
December 31, 2010, our chief executive officer and chief financial officer concluded that, as of such date, our disclosure controls and procedures were effective at the reasonable assurance level.

Managements report on internal control over financial reporting, as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange
Act, is included in Item 8 of this annual report on Form 10-K and is incorporated herein by reference.

Changes in
Internal Control Over Financial Reporting

No changes in our internal control over financial reporting occurred during the
fourth quarter of the fiscal year ended December 31, 2010 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.



|ITEM 9B. | OTHER INFORMATION
|-------- | -----------------

None.



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PART III



|ITEM 10. | DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE
|-------- | ------------------------------------------------------

Information concerning directors that is required by this Item 10 is set forth in our proxy statement for our 2011 annual meeting of stockholders under the headings Directors and Nominees for
Director, Board Committees and Section 16(a) Beneficial Ownership Reporting Compliance, which information is incorporated herein by reference. The information concerning our code of ethics is set forth in our proxy
statement under the heading Code of Business Conduct and Ethics. The name, age, and position of each of our executive officers is set forth under the heading Executive Officers of the Registrant in Part I of this Annual
Report on Form 10-K, which information is incorporated herein by reference.



|ITEM 11. | EXECUTIVE COMPENSATION
|-------- | ----------------------

Information required by this Item 11 is set forth in our proxy statement for our 2011 annual meeting of stockholders under the
headings Executive and Director Compensation and Related Matters, Compensation Committee Interlocks and Insider Participation and Compensation Committee Report which information is incorporated herein by
reference.



|ITEM 12. | SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS
|-------- | ----------------------------------------------------------------------------------------------

Information required by this Item 12 relating to security ownership of certain beneficial owners and management is contained in our
2011 proxy statement under the caption Security Ownership of Certain Beneficial Owners and Management and is incorporated herein by reference. Information required by this Item 12 relating to securities authorized for issuance under
equity compensation plans is contained in our 2011 proxy statement under the caption Executive and Director Compensation and Related MattersSecurities Authorized for Issuance Under Equity Compensation Plans and is incorporated
herein by reference.



|ITEM 13. | CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE
|-------- | -------------------------------------------------------------------------

Information required by this Item 13 is set forth in our proxy statement for our 2011 annual meeting of stockholders under the headings Policies and Procedures for Related Person
Transactions, Determination of Independence and Board Committees, which information is incorporated herein by reference.



|ITEM 14. | PRINCIPAL ACCOUNTANT FEES AND SERVICES
|-------- | --------------------------------------

Information required by this Item 14 is set forth in our proxy statement for our 2011 annual meeting of stockholders under the heading Independent Registered Public Accounting Firms Fees
and Other Matters, which information is incorporated herein by reference.



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PART IV



|ITEM 15. | EXHIBITS AND FINANCIAL STATEMENT SCHEDULES
|-------- | ------------------------------------------

(a)(1) Financial Statements.



|                                                                                                                   |  |                         |    | 
|------------------------------------------------------------------------------------------------------------------ |  | ----------------------- | -- | 
|                                                                                                                   |  | Pagenumberin thisreport |   
|Curis, Inc. and Subsidiaries                                                                                       |  |                         |    | 
|Report of Independent Registered Public Accounting Firm                                                            |  |                         | 69 | 
|Consolidated Balance Sheets as of December 31, 2010 and 2009                                                       |  |                         | 70 | 
|Consolidated Statements of Operations and Comprehensive Loss for the Years Ended December 
31, 2010, 2009 and 2008 |  |                         | 71 | 
|Consolidated Statements of Stockholders Equity for the Years Ended December 
31, 2010, 2009 and 2008              |  |                         | 72 | 
|Consolidated Statements of Cash Flows for the Years Ended December 31, 2010, 2009 and
2008                         |  |                         | 73 | 
|Notes to Consolidated Financial Statements                                                                         |  |                         | 74 | 

(a)(2) Financial
Statement Schedules.

All schedules are omitted because they are not applicable or the required information is shown in
the Financial Statement or Notes thereto.

(a)(3) List of Exhibits.    The list of Exhibits filed
as a part of this annual report on Form 10-K is set forth on the Exhibit Index immediately preceding such Exhibits, and is incorporated herein by reference.



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SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this
report to be signed on its behalf by the undersigned, thereunto duly authorized.



CURIS, INC.By:

/s/ DANIEL R. PASSERIDaniel R. PasseriPresident and Chief Executive Officer


Date: March 8, 2011

Pursuant to the requirements of the Securities Exchange
Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.



|                                            |  |                                                                                                  |  |              
|------------------------------------------- |  | ------------------------------------------------------------------------------------------------ |  | -------------
|Signature                                   |  | Title                                                                                            |  | Date         
|                                            |  |                                                                                                 
|/S/ DANIEL R.
PASSERI Daniel R. Passeri     |  | President, Chief Executive Officer and Director (Principal Executive Officer)                    |  | March 8, 2011
|                                            |  |                                                                                                 
|/S/ MICHAEL P.
GRAY Michael P. Gray         |  | Chief Operating Officer and Chief Financial Officer (Principal Financial and Accounting Officer) |  | March 8, 2011
|                                            |  |                                                                                                 
|/S/ JAMES R. MCNAB,
JR. James R. McNab, Jr. |  | Chairman of the Board of Directors                                                               |  | March 8, 2011
|                                            |  |                                                                                                 
|/S/ SUSAN B.
BAYH Susan B. Bayh             |  | Director                                                                                         |  | March 8, 2011
|                                            |  |                                                                                                 
|/S/ JOSEPH M.
DAVIE Joseph M. Davie         |  | Director                                                                                         |  | March 8, 2011
|                                            |  |                                                                                                 
|/S/ MARTYN D.
GREENACRE Martyn D. Greenacre |  | Director                                                                                         |  | March 8, 2011
|                                            |  |                                                                                                 
|/S/ KENNETH I.
KAITIN Kenneth I. Kaitin     |  | Director                                                                                         |  | March 8, 2011
|                                            |  |                                                                                                 
|/S/ MARC
RUBIN Marc Rubin                   |  | Director                                                                                         |  | March 8, 2011
|                                            |  |                                                                                                 
|/S/ JAMES R.
TOBIN James R. Tobin           |  | Director                                                                                         |  | March 8, 2011



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EXHIBIT INDEX



|           |       |  |             |                                                                                                                                                                    |                           |                   |                |  |          |               |  |  |                     |  |  |  
|---------- | ----- |  | ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------ | ------------------------- | ----------------- | -------------- |  | -------- | ------------- |  |  | ------------------- |  |  | -
|           |       |  |             |                                                                                                                                                                    | Incorporated by
Reference
|ExhibitNo. |       |  | Description |                                                                                                                                                                    | Form                      |                   | SEC FilingDate |  |          | ExhibitNumber |  |  | Filed withthis 10-K
|           |       |  |             | Articles of Incorporation and By-laws                                                                                                                              |                           |                   |                |  |          |               |  |  |                     |  |  |  
|           |       |  |             |                                                                                                                                                                    |                          
|           | 3.1   |  |             | Restated Certificate of Incorporation of Curis, Inc.                                                                                                               |                           | S-4/A (333-32446) |                |  | 06/19/00 |               |  |  | 3.3                 |  |  |  
|           |       |  |             |                                                                                                                                                                    |                          
|           | 3.2   |  |             | Certificate of Designations of Curis, Inc.                                                                                                                         |                           | S-3 (333-50906)   |                |  | 08/10/01 |               |  |  | 3.2                 |  |  |  
|           |       |  |             |                                                                                                                                                                    |                          
|           | 3.3   |  |             | Amended and Restated By-laws of Curis, Inc.                                                                                                                        |                           | S-1 (333-50906)   |                |  | 11/29/00 |               |  |  | 3.2                 |  |  |  
|           |       |  |             |                                                                                                                                                                    |                          
|           | 3.4   |  |             | Amendment to Amended and Restated By-laws of Curis, Inc.                                                                                                           |                           | 8-K               |                |  | 09/24/07 |               |  |  | 3.1                 |  |  |  
|           |       |  |             |                                                                                                                                                                    |                          
|           |       |  |             | Instruments defining the rights of security holders, including indentures                                                                                          |                           |                   |                |  |          |               |  |  |                     |  |  |  
|           |       |  |             |                                                                                                                                                                    |                          
|           | 4.1   |  |             | Form of Curis Common Stock Certificate                                                                                                                             |                           | 10-K              |                |  | 03/01/04 |               |  |  | 4.1                 |  |  |  
|           |       |  |             |                                                                                                                                                                    |                          
|           |       |  |             | Material contractsManagement Contracts and Compensatory Plans                                                                                                     |                           |                   |                |  |          |               |  |  |                     |  |  |  
|           |       |  |             |                                                                                                                                                                    |                          
|           | #10.1 |  |             | Employment Agreement, dated as of September 18, 2007, between Curis and Daniel R. Passeri                                                                          |                           | 8-K               |                |  | 09/24/07 |               |  |  | 10.1                |  |  |  
|           |       |  |             |                                                                                                                                                                    |                          
|           | #10.2 |  |             | Amendment to Employment Agreement, dated as of October 27, 2008, to the employment agreement dated September 18, 2007, by and between Curis and Daniel R. Passeri  |                           | 10-Q              |                |  | 10/28/08 |               |  |  | 10.1                |  |  |  
|           |       |  |             |                                                                                                                                                                    |                          
|           | #10.3 |  |             | Amendment to Employment Agreement, dated as of December 10, 2010, to the employment agreement dated September 18, 2007, by and between Curis and Daniel R. Passeri |                           |                   |                |  |          |               |  |  |                     |  |  | X
|           |       |  |             |                                                                                                                                                                    |                          
|           | #10.4 |  |             | Offer Letter, dated as December 10, 2003, between Curis and Michael P. Gray                                                                                        |                           | 10-K              |                |  | 03/01/04 |               |  |  | 10.4                |  |  |  
|           |       |  |             |                                                                                                                                                                    |                          
|           | #10.5 |  |             | Amendment to Offer Letter, dated as of October 31, 2006, to the offer letter dated December 10, 2003, by and between Curis and Michael P. Gray                     |                           | 8-K               |                |  | 11/02/06 |               |  |  | 10.3                |  |  |  
|           |       |  |             |                                                                                                                                                                    |                          
|           | #10.6 |  |             | Amendment to Offer Letter, dated as of October 27, 2008, to the offer letter dated December 10, 2003, by and between Curis and Michael P. Gray                     |                           | 10-Q              |                |  | 10/28/08 |               |  |  | 10.2                |  |  |  
|           |       |  |             |                                                                                                                                                                    |                          
|           | #10.7 |  |             | Amendment to Offer Letter, dated as of December 10, 2010, to the offer letter dated December 10, 2003, by and between Curis and Michael P. Gray                    |                           |                   |                |  |          |               |  |  |                     |  |  | X
|           |       |  |             |                                                                                                                                                                    |                          
|           | #10.8 |  |             | Offer Letter, dated May 2, 2001, by and between Curis and Changgeng Qian                                                                                           |                           | 10-K              |                |  | 3/14/08  |               |  |  | 10.5                |  |  |  



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|           |        |  |             |                                                                                                                                                                      |                           |      |                |          |               |  |      |                     |  |  
|---------- | ------ |  | ----------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------- | ---- | -------------- | -------- | ------------- |  | ---- | ------------------- |  | -
|           |        |  |             |                                                                                                                                                                      | Incorporated by
Reference
|ExhibitNo. |        |  | Description |                                                                                                                                                                      | Form                      |      | SEC FilingDate |          | ExhibitNumber |  |      | Filed withthis 10-K
|           |        |  |             |                                                                                                                                                                      |                          
|           | #10.9  |  |             | Amendment to Offer Letter, dated as of May 10, 2002, to the offer letter dated May 2, 2001, by and between Curis and Changgeng Qian                                  |                           | 10-K |                | 3/14/08  |               |  | 10.6 |                     |  |  
|           |        |  |             |                                                                                                                                                                      |                          
|           | #10.10 |  |             | Amendment to Offer Letter, dated as of December 14, 2006, to the offer letter dated May 2, 2001, as amended on May 10, 2002, by and between Curis and Changgeng
Qian |                           | 10-K |                | 3/14/08  |               |  | 10.7 |                     |  |  
|           |        |  |             |                                                                                                                                                                      |                          
|           | #10.11 |  |             | Amendment to Offer Letter, dated as of October 27, 2008, to the offer letter dated May 2, 2001, by and between Curis and Changgeng Qian                              |                           | 10-Q |                | 10/28/08 |               |  | 10.3 |                     |  |  
|           |        |  |             |                                                                                                                                                                      |                          
|           | #10.12 |  |             | Amendment to Offer Letter, dated as of December 10, 2010, to the offer letter dated May 2, 2001, by and between Curis and Changgeng Qian                             |                           |      |                |          |               |  |      |                     |  | X
|           |        |  |             |                                                                                                                                                                      |                          
|           | #10.13 |  |             | Offer Letter, dated January 11, 2001, by and between Curis and Mark W. Noel                                                                                          |                           | 10-K |                | 03/02/07 |               |  | 10.6 |                     |  |  
|           |        |  |             |                                                                                                                                                                      |                          
|           | #10.14 |  |             | Amendment to Offer Letter, dated as of October 31, 2006, to the offer letter dated January 11, 2001, by and between Curis and Mark W. Noel                           |                           | 8-K  |                | 11/02/06 |               |  | 10.4 |                     |  |  
|           |        |  |             |                                                                                                                                                                      |                          
|           | #10.15 |  |             | Amendment to Offer Letter, dated as of October 27, 2008, to the offer letter dated January 11, 2001, by and between Curis and Mark W. Noel                           |                           | 10-Q |                | 10/28/08 |               |  | 10.4 |                     |  |  
|           |        |  |             |                                                                                                                                                                      |                          
|           | #10.16 |  |             | Amendment to Offer Letter, dated as of December 10, 2010, to the offer letter dated January 11, 2001, by and between Curis and Mark W. Noel                          |                           |      |                |          |               |  |      |                     |  | X
|           |        |  |             |                                                                                                                                                                      |                          
|           | #10.17 |  |             | Offer Letter, dated March 21, 2008, by and between Curis and Mitchell Keegan                                                                                         |                           | 8-K  |                | 06/04/10 |               |  | 10.4 |                     |  |  
|           |        |  |             |                                                                                                                                                                      |                          
|           | #10.18 |  |             | Amendment to Offer Letter, dated as of June 3, 2010, to the offer letter dated March 21, 2008, by and between Curis and Mitchell Keegan                              |                           | 8-K  |                | 06/04/10 |               |  | 10.5 |                     |  |  
|           |        |  |             |                                                                                                                                                                      |                          
|           | #10.19 |  |             | Amendment to Offer Letter, dated as of December 10, 2010, to the offer letter dated January 11, 2001, by and between Curis and Mitchell Keegan                       |                           |      |                |          |               |  |      |                     |  | X
|           |        |  |             |                                                                                                                                                                      |                          
|           | #10.20 |  |             | Scientific Advisory Agreement dated September 14, 2006 by and between Curis and Joseph M. Davie, Ph. D., M.D.                                                        |                           | 8-K  |                | 09/19/06 |               |  | 10.2 |                     |  |  
|           |        |  |             |                                                                                                                                                                      |                          
|           | #10.21 |  |             | First Amendment to Scientific Advisory Agreement dated June 3, 2010 by and between Curis and Joseph M. Davie, Ph. D., M.D.                                           |                           | 10-Q |                | 08/03/10 |               |  | 10.1 |                     |  |  



E-2



---

##### Table of Contents

|           |        |  |             |                                                                                                                                                                             |                           |                   |                |          |               |  |           |                     |  |  
|---------- | ------ |  | ----------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------- | ----------------- | -------------- | -------- | ------------- |  | --------- | ------------------- |  | -
|           |        |  |             |                                                                                                                                                                             | Incorporated by
Reference
|ExhibitNo. |        |  | Description |                                                                                                                                                                             | Form                      |                   | SEC FilingDate |          | ExhibitNumber |  |           | Filed withthis 10-K
|           |        |  |             |                                                                                                                                                                             |                          
|           | #10.22 |  |             | Agreement for Service as Chairman of the Board of Directors, between Curis, Inc. and James McNab, dated as of June 1, 2005                                                  |                           | 8-K               |                | 06/07/05 |               |  | 10.1      |                     |  |  
|           |        |  |             |                                                                                                                                                                             |                          
|           | #10.23 |  |             | Form of Indemnification Agreement, between Curis, Inc. and each member of the Board of Directors                                                                            |                           |                   |                |          |               |  |           |                     |  | X
|           |        |  |             |                                                                                                                                                                             |                          
|           | #10.24 |  |             | Curis 2000 Stock Incentive Plan                                                                                                                                             |                           | S-4/A (333-32446) |                | 05/31/00 |               |  | 10.71     |                     |  |  
|           |        |  |             |                                                                                                                                                                             |                          
|           | #10.25 |  |             | Curis 2000 Director Stock Option Plan                                                                                                                                       |                           | S-4/A (333-32446) |                | 05/31/00 |               |  | 10.72     |                     |  |  
|           |        |  |             |                                                                                                                                                                             |                          
|           | #10.26 |  |             | Curis 2000 Employee Stock Purchase Plan                                                                                                                                     |                           | S-4/A (333-32446) |                | 05/31/00 |               |  | 10.73     |                     |  |  
|           |        |  |             |                                                                                                                                                                             |                          
|           | #10.27 |  |             | Form of Incentive Stock Option Agreement granted to directors and named executive officers under Curis 2000 Stock Incentive Plan                                           |                           | 10-Q              |                | 10/26/04 |               |  | 10.2      |                     |  |  
|           |        |  |             |                                                                                                                                                                             |                          
|           | #10.28 |  |             | Form of Non-statutory Stock Option Agreement granted to directors and named executive officers under Curis 2000 Stock Incentive Plan                                       |                           | 10-Q              |                | 10/26/04 |               |  | 10.3      |                     |  |  
|           |        |  |             |                                                                                                                                                                             |                          
|           | #10.29 |  |             | Form of Non-statutory Stock Option Agreement granted to non-employee directors under Curis 2000 Director Stock Option Plan                                                 |                           | 10-Q              |                | 10/26/04 |               |  | 10.4      |                     |  |  
|           |        |  |             |                                                                                                                                                                             |                          
|           | #10.30 |  |             | Curis 2010 Stock Incentive Plan                                                                                                                                             |                           | Def 14A           |                | 04/16/10 |               |  | Exhibit A |                     |  |  
|           |        |  |             |                                                                                                                                                                             |                          
|           | #10.31 |  |             | Curis 2010 Employee Stock Purchase Plan                                                                                                                                     |                           | Def 14A           |                | 04/16/10 |               |  | Exhibit B |                     |  |  
|           |        |  |             |                                                                                                                                                                             |                          
|           | #10.32 |  |             | Form of Incentive Stock Option Agreement granted to directors and named executive officers under Curis 2010 Stock Incentive Plan                                           |                           | 8-K               |                | 06/04/10 |               |  | 10.1      |                     |  |  
|           |        |  |             |                                                                                                                                                                             |                          
|           | #10.33 |  |             | Form of Non-Statutory Stock Option Agreement granted to directors and named executive officers under Curis 2010 Stock Incentive Plan                                       |                           | 8-K               |                | 06/04/10 |               |  | 10.2      |                     |  |  
|           |        |  |             |                                                                                                                                                                             |                          
|           | #10.34 |  |             | Form of Restricted Stock Agreement granted to directors and named executive officers under Curis 2010 Stock Incentive Plan                                                 |                           | 8-K               |                | 06/04/10 |               |  | 10.3      |                     |  |  
|           |        |  |             |                                                                                                                                                                            
|           |        |  |             | Material contractsLeases                                                                                                                                                   |                           |                   |                |          |               |  |           |                    
|           |        |  |             |                                                                                                                                                                             |                          
|           | 10.35  |  |             | Lease, dated September 16, 2010, between Curis, Inc. and the Trustees of Lexington Office Realty Trust relating to the premises at 4 Maguire Road, Lexington,
Massachusetts |                           | 8-K               |                | 9/21/10  |               |  | 10.1      |                     |  |  
|           |        |  |             |                                                                                                                                                                            
|           |        |  |             | Material contractsLicense and Collaboration Agreements                                                                                                                     |                           |                   |                |          |               |  |           |                    
|           |        |  |             |                                                                                                                                                                             |                          
|          | 10.36  |  |             | Collaborative Research, Development and License Agreement, dated June 11, 2003, between Curis and Genentech, Inc.                                                           |                           | 8-K               |                | 07/10/03 |               |  | 10.1      |                     |  |  



E-3



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##### Table of Contents

|           |       |  |             |                                                                                                                                        |                           |      |                |           |               |  |      |                     |  |  
|---------- | ----- |  | ----------- | -------------------------------------------------------------------------------------------------------------------------------------- | ------------------------- | ---- | -------------- | --------- | ------------- |  | ---- | ------------------- |  | -
|           |       |  |             |                                                                                                                                        | Incorporated by
Reference
|ExhibitNo. |       |  | Description |                                                                                                                                        | Form                      |      | SEC FilingDate |           | ExhibitNumber |  |      | Filed withthis 10-K
|           |       |  |             |                                                                                                                                        |                          
|           | 10.37 |  |             | License Agreement, dated August 5, 2009, by and between the Company and Debiopharm S.A                                                 |                           | 10-Q |                | 10/29/09  |               |  | 10.1 |                     |  |  
|           |       |  |             |                                                                                                                                       
|           |       |  |             | Material contractsMiscellaneous                                                                                                       |                           |      |                |           |               |  |      |                    
|           |       |  |             |                                                                                                                                        |                          
|           | 10.38 |  |             | Registration Rights Agreement, dated June 13, 2003, between Curis and Genentech, Inc.                                                  |                           | 8-K  |                | 07/10/03  |               |  | 10.3 |                     |  |  
|           |       |  |             |                                                                                                                                        |                          
|           | 10.39 |  |             | Common Stock Purchase Agreement, dated June 11, 2003, between Curis and Genentech, Inc.                                                |                           | 8-K  |                | 07/10/03  |               |  | 10.2 |                     |  |  
|           |       |  |             |                                                                                                                                        |                          
|           | 10.40 |  |             | Placement Agent Agreement, dated January 22, 2010, by and among the Company, RBC Capital Markets Corporation and Rodman & Renshaw, LLC |                           | 8-K  |                | 1/22/10   |               |  | 1.1  |                     |  |  
|           |       |  |             |                                                                                                                                        |                          
|           | 10.41 |  |             | Form of Subscription Agreement, dated as of January 22, 2010, by and among the Company and the investors named therein                 |                           | 8-K  |                | 1/22/2010 |               |  | 10.1 |                     |  |  
|           |       |  |             |                                                                                                                                        |                          
|           | 10.42 |  |             | Form of Warrant, dated January 22, 2010, issued pursuant to the Subscription Agreement, dated as of January 22, 2010                   |                           | 8-K  |                | 1/22/2010 |               |  | 4.1  |                     |  |  
|           |       |  |             |                                                                                                                                       
|           |       |  |             | Code of Conduct                                                                                                                        |                           |      |                |           |               |  |      |                    
|           |       |  |             |                                                                                                                                        |                          
|           | 14    |  |             | Code of Business Conduct and Ethics                                                                                                    |                           |      |                |           |               |  |      |                     |  | X
|           |       |  |             |                                                                                                                                       
|           |       |  |             | Additional Exhibits                                                                                                                    |                           |      |                |           |               |  |      |                    
|           |       |  |             |                                                                                                                                        |                          
|           | 21    |  |             | Subsidiaries of Curis                                                                                                                  |                           |      |                |           |               |  |      |                     |  | X
|           |       |  |             |                                                                                                                                        |                          
|           | 23.1  |  |             | Consent of PricewaterhouseCoopers LLP                                                                                                  |                           |      |                |           |               |  |      |                     |  | X
|           |       |  |             |                                                                                                                                        |                          
|           | 31.1  |  |             | Certification of the Chief Executive Officer pursuant to Rule 13a-14(a) of the Exchange Act/15d-14(a) of the Exchange Act              |                           |      |                |           |               |  |      |                     |  | X
|           |       |  |             |                                                                                                                                        |                          
|           | 31.2  |  |             | Certification of the Chief Financial Officer pursuant to Rule 13a-14(a) of the Exchange Act/15d-14(a) of the Exchange Act              |                           |      |                |           |               |  |      |                     |  | X
|           |       |  |             |                                                                                                                                        |                          
|           | 32.1  |  |             | Certification of the Chief Executive Officer pursuant to Rule 13a-14(b)/15d-14(b) of the Exchange Act and 18 U.S.C. Section 1350       |                           |      |                |           |               |  |      |                     |  | X
|           |       |  |             |                                                                                                                                        |                          
|           | 32.2  |  |             | Certification of the Chief Financial Officer pursuant to Rule 13a-14(b)/15d-14(b) of the Exchange Act and 18 U.S.C. Section 1350       |                           |      |                |           |               |  |      |                     |  | X



|# | Indicates management contract or compensatory plan or arrangement.
|- | ------------------------------------------------------------------



| | Confidential treatment has been requested as to certain portions, which portions have been separately filed with the Securities and Exchange Commission.
|- | --------------------------------------------------------------------------------------------------------------------------------------------------------



E-4