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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549



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FORM 10-Q

(Mark one)



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

FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2007

OR



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

Commission File Number: 000-30347



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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.)
|                                                               | 
|45 Moulton Street Cambridge, Massachusetts                     |  | 02138                               
|(Address of Principal Executive Offices)                       |  | (Zip Code)                          

Registrants Telephone Number, Including Area Code: (617) 503-6500



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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 is a large accelerated filer, an accelerated filer,
or a non-accelerated filer. See definition of accelerated filer and large accelerated filer in Rule 12b-2 of the Exchange Act.

Large accelerated filer ̈Accelerated filer    x                      Non-accelerated filer ̈

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

As of July 27, 2007, there were 49,533,950 shares of the registrants common stock
outstanding.



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CURIS, INC. AND SUBSIDIARY QUARTERLY REPORT ON FORM 10-Q

INDEX



|          |  |                                                                                                                        |  |           
|--------- |  | ---------------------------------------------------------------------------------------------------------------------- |  | ----------
|          |  |                                                                                                                        |  | PageNumber
|PART I.   |  | FINANCIAL INFORMATION                                                                                                  |  |           
|          |  |                                                                                                                       
|Item 1.   |  | Unaudited Financial Statements                                                                                         |  |           
|          |  |                                                                                                                       
|          |  | Condensed Consolidated Balance Sheets as of June 30, 2007 and December 31, 2006                                        |  | 3         
|          |  |                                                                                                                       
|          |  | Consolidated Statements of Operations and Comprehensive Loss for the three and six months ended June 30, 2007 and 2006 |  | 4         
|          |  |                                                                                                                       
|          |  | Consolidated Statements of Cash Flows for the six months ended June 30, 2007 and 2006                                  |  | 5         
|          |  |                                                                                                                       
|          |  | Notes to Condensed Consolidated Financial Statements                                                                   |  | 6         
|          |  |                                                                                                                       
|Item 2.   |  | Managements Discussion and Analysis of Financial Condition and Results of Operations                                  |  | 17        
|          |  |                                                                                                                       
|Item 3.   |  | Quantitative and Qualitative Disclosures About Market Risk                                                             |  | 30        
|          |  |                                                                                                                       
|Item 4.   |  | Controls and Procedures                                                                                                |  | 31        
|          |  |                                                                                                                       
|PART II.  |  | OTHER INFORMATION                                                                                                      |  |           
|          |  |                                                                                                                       
|Item 1A.  |  | Risk Factors                                                                                                           |  | 32        
|          |  |                                                                                                                       
|Item 4.   |  | Submission of Matters to a Vote of Security Holders                                                                    |  | 47        
|          |  |                                                                                                                       
|Item 6.   |  | Exhibits                                                                                                               |  | 48        
|          | 
|SIGNATURE |  | 49                                                                                                                    



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Item 1. FINANCIAL STATEMENTS

CURIS, INC. AND SUBSIDIARIES CONDENSED CONSOLIDATED BALANCE SHEETS

(unaudited)



|                                                                                                                                                                                                                                                     |  |               |              |   |                  |   |              |  
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | ------------- | ------------ | - | ---------------- | - | ------------ | -
|                                                                                                                                                                                                                                                     |  | June 30, 2007 |              |   | December 31,2006 |  
|ASSETS                                                                                                                                                                                                                                               |  |               |              |   |                  |   |              |  
|Current Assets:                                                                                                                                                                                                                                      |  |               |              |   |                  |   |              |  
|Cash and cash equivalents                                                                                                                                                                                                                            |  | $             | 15,167,137   |   |                  | $ | 18,829,332   |  
|Marketable securities                                                                                                                                                                                                                                |  |               | 15,061,066   |   |                  |   | 17,826,675   |  
|Accounts receivable                                                                                                                                                                                                                                  |  |               | 283,419      |   |                  |   | 1,315,412    |  
|Prepaid expenses and other current assets                                                                                                                                                                                                            |  |               | 231,555      |   |                  |   | 541,182      |  
|                                                                                                                                                                                                                                                     |  |               |              |   |                  |   |              |  
|Total current assets                                                                                                                                                                                                                                 |  |               | 30,743,177   |   |                  |   | 38,512,601   |  
|                                                                                                                                                                                                                                                     |  |               |              |   |                  |   |              |  
|Property and equipment, net                                                                                                                                                                                                                          |  |               | 3,209,547    |   |                  |   | 4,393,604    |  
|Long-term investmentrestricted                                                                                                                                                                                                                      |  |               | 201,844      |   |                  |   | 201,844      |  
|Goodwill                                                                                                                                                                                                                                             |  |               | 8,982,000    |   |                  |   | 8,982,000    |  
|Deposits and other assets, net                                                                                                                                                                                                                       |  |               | 21,562       |   |                  |   | 178,204      |  
|                                                                                                                                                                                                                                                     |  |               |              |   |                  |   |              |  
|                                                                                                                                                                                                                                                     |  | $             | 43,158,130   |   |                  | $ | 52,268,253   |  
|                                                                                                                                                                                                                                                     |  |               |              |   |                  |   |              |  
|LIABILITIES AND STOCKHOLDERS EQUITY                                                                                                                                                                                                                 |  |               |              |   |                  |   |              |  
|Current Liabilities:                                                                                                                                                                                                                                 |  |               |              |   |                  |   |              |  
|Debt, current portion                                                                                                                                                                                                                                |  | $             | 1,115,634    |   |                  | $ | 1,246,289    |  
|Accounts payable                                                                                                                                                                                                                                     |  |               | 1,182,852    |   |                  |   | 1,461,195    |  
|Accrued liabilities                                                                                                                                                                                                                                  |  |               | 1,174,828    |   |                  |   | 1,529,337    |  
|Deferred revenue, current portion                                                                                                                                                                                                                    |  |               | 1,240,913    |   |                  |   | 1,755,160    |  
|                                                                                                                                                                                                                                                     |  |               |              |   |                  |   |              |  
|Total current liabilities                                                                                                                                                                                                                            |  |               | 4,714,227    |   |                  |   | 5,991,981    |  
|Debt obligations, net of current portion                                                                                                                                                                                                             |  |               | 40,038       |   |                  |   | 733,333      |  
|Deferred revenue, net of current portion                                                                                                                                                                                                             |  |               | 7,657,021    |   |                  |   | 9,131,673    |  
|Other long-term liabilities                                                                                                                                                                                                                          |  |               | 428,439      |   |                  |   | 514,127      |  
|                                                                                                                                                                                                                                                     |  |               |              |   |                  |   |              |  
|Total liabilities                                                                                                                                                                                                                                    |  |               | 12,839,725   |   |                  |   | 16,371,114   |  
|                                                                                                                                                                                                                                                     |  |               |              |   |                  |   |              |  
|Commitments                                                                                                                                                                                                                                          |  |               |              |   |                  |   |              |  
|Stockholders Equity:                                                                                                                                                                                                                                |  |               |              |   |                  |   |              |  
|Common stock, $0.01 par value125,000,000 shares authorized; 50,581,657 and 49,533,950 shares issued and outstanding, respectively, at
June 30, 2007 and 50,381,561 and 49,333,854 shares issued and outstanding, respectively, at December 31, 2006 |  |               | 505,817      |   |                  |   | 503,816      |  
|Additional paid-in capital                                                                                                                                                                                                                           |  |               | 727,168,936  |   |                  |   | 725,271,688  |  
|Treasury stock (at cost, 1,047,707 shares)                                                                                                                                                                                                           |  |               | (891,274     | ) |                  |   | (891,274     | )
|Deferred compensation                                                                                                                                                                                                                                |  |               | (56,526      | ) |                  |   | (111,390     | )
|Accumulated deficit                                                                                                                                                                                                                                  |  |               | (696,421,812 | ) |                  |   | (688,883,495 | )
|Accumulated other comprehensive income                                                                                                                                                                                                               |  |               | 13,264       |   |                  |   | 7,794        |  
|                                                                                                                                                                                                                                                     |  |               |              |   |                  |   |              |  
|Total stockholders equity                                                                                                                                                                                                                           |  |               | 30,318,405   |   |                  |   | 35,897,139   |  
|                                                                                                                                                                                                                                                     |  |               |              |   |                  |   |              |  
|                                                                                                                                                                                                                                                     |  | $             | 43,158,130   |   |                  | $ | 52,268,253   |  
|                                                                                                                                                                                                                                                     |  |               |              |   |                  |   |              |  

See accompanying notes to unaudited condensed consolidated financial statements.



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CURIS, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (unaudited)



|                                                   |  |                             |            |   |                           |   |            |      |  |   |            |   |  |   |            |  
|-------------------------------------------------- |  | --------------------------- | ---------- | - | ------------------------- | - | ---------- | ---- |  | - | ---------- | - |  | - | ---------- | -
|                                                   |  | Three Months Ended June 30, |            |   | Six Months Ended June 30, |  
|                                                   |  | 2007                        |            |   | 2006                      |   |            | 2007 |  |   | 2006       |  
|REVENUES:                                          |  |                             |            |   |                           |   |            |      |  |   |            |   |  |   |            |  
|Research and development contracts                 |  | $                           | 682,281    |   |                           | $ | 2,783,413  |      |  | $ | 1,965,154  |   |  | $ | 5,356,358  |  
|License fees                                       |  |                             | 546,443    |   |                           |   | 321,663    |      |  |   | 1,626,356  |   |  |   | 613,247    |  
|                                                   |  |                             |            |   |                           |   |            |      |  |   |            |   |  |   |            |  
|Gross Revenues                                     |  |                             | 1,228,724  |   |                           |   | 3,105,076  |      |  |   | 3,591,510  |   |  |   | 5,969,605  |  
|Contra-revenues from co-development with Genentech |  |                             |           |   |                           |   | (546,191   | )    |  |   |           |   |  |   | (1,372,291 | )
|                                                   |  |                             |            |   |                           |   |            |      |  |   |            |   |  |   |            |  
|Net Revenues                                       |  |                             | 1,228,724  |   |                           |   | 2,558,885  |      |  |   | 3,591,510  |   |  |   | 4,597,314  |  
|                                                   |  |                             |            |   |                           |   |            |      |  |   |            |   |  |   |            |  
|COSTS AND EXPENSES:                                |  |                             |            |   |                           |   |            |      |  |   |            |   |  |   |            |  
|Research and development                           |  |                             | 3,046,824  |   |                           |   | 3,840,313  |      |  |   | 6,342,439  |   |  |   | 7,324,958  |  
|General and administrative                         |  |                             | 2,359,186  |   |                           |   | 2,962,165  |      |  |   | 5,310,771  |   |  |   | 5,847,903  |  
|Amortization of intangible assets                  |  |                             |           |   |                           |   | 8,282      |      |  |   |           |   |  |   | 27,050     |  
|                                                   |  |                             |            |   |                           |   |            |      |  |   |            |   |  |   |            |  
|Total costs and expenses                           |  |                             | 5,406,010  |   |                           |   | 6,810,760  |      |  |   | 11,653,210 |   |  |   | 13,199,911 |  
|                                                   |  |                             |            |   |                           |   |            |      |  |   |            |   |  |   |            |  
|Loss from operations                               |  |                             | (4,177,286 | ) |                           |   | (4,251,875 | )    |  |   | (8,061,700 | ) |  |   | (8,602,597 | )
|                                                   |  |                             |            |   |                           |   |            |      |  |   |            |   |  |   |            |  
|OTHER INCOME (EXPENSE):                            |  |                             |            |   |                           |   |            |      |  |   |            |   |  |   |            |  
|Interest income                                    |  |                             | 328,957    |   |                           |   | 394,310    |      |  |   | 694,309    |   |  |   | 768,159    |  
|Other expense                                      |  |                             | (125,075   | ) |                           |   |           |      |  |   | (113,811   | ) |  |   |           |  
|Interest expense                                   |  |                             | (24,140    | ) |                           |   | (66,630    | )    |  |   | (57,115    | ) |  |   | (138,751   | )
|                                                   |  |                             |            |   |                           |   |            |      |  |   |            |   |  |   |            |  
|Total other income, net                            |  |                             | 179,742    |   |                           |   | 327,680    |      |  |   | 523,383    |   |  |   | 629,408    |  
|                                                   |  |                             |            |   |                           |   |            |      |  |   |            |   |  |   |            |  
|Net loss                                           |  | $                           | (3,997,544 | ) |                           | $ | (3,924,195 | )    |  | $ | (7,538,317 | ) |  | $ | (7,973,189 | )
|                                                   |  |                             |            |   |                           |   |            |      |  |   |            |   |  |   |            |  
|Net loss per common share (basic and diluted)      |  | $                           | (0.08      | ) |                           | $ | (0.08      | )    |  | $ | (0.15      | ) |  | $ | (0.16      | )
|                                                   |  |                             |            |   |                           |   |            |      |  |   |            |   |  |   |            |  
|Weighted average common shares (basic and diluted) |  |                             | 49,408,100 |   |                           |   | 49,032,837 |      |  |   | 49,381,508 |   |  |   | 48,944,392 |  
|                                                   |  |                             |            |   |                           |   |            |      |  |   |            |   |  |   |            |  
|Net loss                                           |  | $                           | (3,997,544 | ) |                           | $ | (3,924,195 | )    |  | $ | (7,538,317 | ) |  | $ | (7,973,189 | )
|Unrealized gain on marketable securities           |  |                             | 7,990      |   |                           |   | 12,512     |      |  |   | 5,470      |   |  |   | 25,330     |  
|                                                   |  |                             |            |   |                           |   |            |      |  |   |            |   |  |   |            |  
|Comprehensive loss                                 |  | $                           | (3,989,554 | ) |                           | $ | (3,911,683 | )    |  | $ | (7,532,847 | ) |  | $ | (7,947,859 | )
|                                                   |  |                             |            |   |                           |   |            |      |  |   |            |   |  |   |            |  

See accompanying notes to unaudited condensed consolidated financial statements.



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CURIS, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited)



|                                                                                           |  |                           |             |   |      |   |             |  
|------------------------------------------------------------------------------------------ |  | ------------------------- | ----------- | - | ---- | - | ----------- | -
|                                                                                           |  | Six Months Ended June 30, |            
|                                                                                           |  | 2007                      |             |   | 2006 |  
|CASH FLOWS FROM OPERATING ACTIVITIES:                                                      |  |                           |             |   |      |   |             |  
|Net loss                                                                                   |  | $                         | (7,538,317  | ) |      | $ | (7,973,189  | )
|Adjustments to reconcile net loss to net cash used in operating activities:                |  |                           |             |   |      |   |             |  
|Depreciation and amortization                                                              |  |                           | 786,593     |   |      |   | 656,482     |  
|Stock-based compensation expense                                                           |  |                           | 1,798,373   |   |      |   | 1,875,976   |  
|Gain on sale of assets                                                                     |  |                           | (68,329     | ) |      |   |            |  
|Impairment of investments                                                                  |  |                           | 145,000     |   |      |   |            |  
|Impairment of assets                                                                       |  |                           | 318,380     |   |      |   |             |  
|Amortization of intangible assets                                                          |  |                           |            |   |      |   | 27,050      |  
|Realized foreign currency exchange gain                                                    |  |                           | (26,935     | ) |      |   |            |  
|Changes in operating assets and liabilities:                                               |  |                           |             |   |      |   |             |  
|Accounts receivable                                                                        |  |                           | 1,058,928   |   |      |   | 434,878     |  
|Prepaid expenses and other assets                                                          |  |                           | 321,269     |   |      |   | (73,575     | )
|Accounts payable and accrued liabilities                                                   |  |                           | (724,194    | ) |      |   | 1,321,947   |  
|Deferred revenue                                                                           |  |                           | (1,988,899  | ) |      |   | 1,904,114   |  
|                                                                                           |  |                           |             |   |      |   |             |  
|Total adjustments                                                                          |  |                           | 1,620,186   |   |      |   | 6,146,872   |  
|                                                                                           |  |                           |             |   |      |   |             |  
|Net cash used in operating activities                                                      |  |                           | (5,918,131  | ) |      |   | (1,826,317  | )
|                                                                                           |  |                           |             |   |      |   |             |  
|CASH FLOWS FROM INVESTING ACTIVITIES:                                                      |  |                           |             |   |      |   |             |  
|Purchases of marketable securities                                                         |  |                           | (14,085,990 | ) |      |   | (24,978,415 | )
|Sales of marketable securities                                                             |  |                           | 16,857,069  |   |      |   | 28,902,853  |  
|Purchases of property and equipment                                                        |  |                           | (49,276     | ) |      |   | (69,960     | )
|Net proceeds from sale of assets                                                           |  |                           | 196,689     |   |      |   |            |  
|                                                                                           |  |                           |             |   |      |   |             |  
|Net cash provided by investing activities                                                  |  |                           | 2,918,492   |   |      |   | 3,854,478   |  
|                                                                                           |  |                           |             |   |      |   |             |  
|CASH FLOWS FROM FINANCING ACTIVITIES:                                                      |  |                           |             |   |      |   |             |  
|Proceeds from issuance of common stock                                                     |  |                           | 155,740     |   |      |   | 88,205      |  
|Repayments of principal obligations under note payable and capital leases                  |  |                           | (818,296    | ) |      |   | (616,667    | )
|                                                                                           |  |                           |             |   |      |   |             |  
|Net cash used in financing activities                                                      |  |                           | (662,556    | ) |      |   | (528,462    | )
|                                                                                           |  |                           |             |   |      |   |             |  
|NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS                                       |  |                           | (3,662,195  | ) |      |   | 1,499,699   |  
|CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD                                             |  |                           | 18,829,332  |   |      |   | 22,310,298  |  
|                                                                                           |  |                           |             |   |      |   |             |  
|CASH AND CASH EQUIVALENTS, END OF PERIOD                                                   |  | $                         | 15,167,137  |   |      | $ | 23,809,997  |  
|                                                                                           |  |                           |             |   |      |   |             |  
|                                                                                           | 
|                                                                                           |  | Six Months Ended June 30, |            
|                                                                                           |  | 2007                      |             |   | 2006 |  
|SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES:                     |  |                           |             |   |      |   |             |  
|Issuance of common stock in connection with conversion of note payable to Becton Dickinson |  | $                         |            |   |      | $ | 2,605,280   |  
|                                                                                           |  |                           |             |   |      |   |             |  

See accompanying notes to unaudited condensed consolidated financial statements.



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CURIS, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited)

1. Nature of Business

Curis, Inc. (the
Company or Curis) is a drug discovery and development company that is seeking to leverage its innovative biological signaling pathway drug technologies to create new targeted medicines primarily to treat cancer, and also to
treat several other medical indications for which there are substantial unmet therapeutic needs. Biological signaling pathways, also referred to as signaling pathways, are prominent regulators of specific tissue and organ formation during prenatal
development and are used by the body throughout life to repair and regulate human tissue. The Companys product development approach involves using small molecules, proteins or antibodies to modulate these regulatory signaling pathways, for
example, to increase the pathway signals when they are insufficient or to decrease them when they are excessive. In expanding its drug development efforts in the field of cancer, the Company is building upon its previous experiences in targeting
signaling pathways in its current programs in the areas of cancer, neurological disease and cardiovascular disease. The Company operates in a single reportable segment: developmental biology products. 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
technological innovations, dependence on key personnel, its ability to protect proprietary technology, reliance on corporate collaborators and licensors 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 grow its business and obtain adequate financing to fund this growth.

2. Basis of Presentation

The accompanying
consolidated financial statements of the Company have been prepared in accordance with the instructions to Form 10-Q and Article 10 of Regulation S-X. These statements, however, are condensed and do not include all disclosures required by accounting
principles generally accepted in the United States of America for complete financial statements and should be read in conjunction with the Companys Annual Report on Form 10-K for the year ended December 31, 2006, as filed with the
Securities and Exchange Commission on March 2, 2007.

In the opinion of the Company, the unaudited financial statements contain all
adjustments (all of which were considered normal and recurring) necessary to present fairly the Companys financial position at June 30, 2007 and the results of operations for the three- and six-month periods ended June 30, 2007 and
2006, and cash flows for the six-month periods ended June 30, 2007 and 2006. The preparation of the Companys consolidated financial statements in conformity with accounting principles generally accepted in the U.S. requires management to
make estimates and assumptions that affect the reported amounts and disclosure of certain assets and liabilities at the balance sheet date. Such estimates include revenue recognition, the collectibility of receivables, the carrying value of property
and equipment and intangible assets, and the value of certain investments and liabilities. Actual results may differ from such estimates.

These interim results are not necessarily indicative of results to be expected for a full year or subsequent interim periods.



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3. 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, contingent cash payments based upon achievement of clinical development objectives and royalties on
product sales. The Company follows the provisions of the Securities and Exchange Commissions Staff Accounting Bulletin (SAB) No. 104 (SAB No. 104), Revenue Recognition, Emerging Issues Task Force (EITF) Issue No. 00-21 (EITF
00-21), Accounting for Revenue Arrangements with Multiple Deliverables, EITF Issue No. 99-19 (EITF 99-19), Reporting Revenue Gross as a Principal Versus Net as an Agent,and EITF Issue No. 01-9 (EITF 01-9), Accounting for
Consideration Given by a Vendor to a Customer (Including a Reseller of the Vendors Products). For a complete discussion of the Companys revenue recognition policy, see Note 2(c) included in its annual report on Form 10-K, as
previously filed with the Securities and Exchange Commission on March 2, 2007.

Amounts received prior to satisfying the above revenue
recognition criteria are recorded as deferred revenue in the accompanying consolidated balance sheets. Amounts not expected to be recognized during the twelve-month period ended June 30, 2008 are classified as long-term deferred revenue. As of
June 30, 2007, the Company has short- and long-term deferred revenue of $1,241,000 and $7,657,000, respectively, related to its collaborations.

4.
Genentech April 2005 Drug Discovery Collaboration

On April 1, 2005, the Company entered into a drug discovery collaboration
agreement with Genentech for the discovery and development of small molecule compounds that modulate the Wnt signaling pathway. The Wnt signaling pathway plays an important role in cell proliferation and has been implicated in several cancers,
including colon, breast and ovarian cancers. Under the terms of the agreement, the Company has granted Genentech an exclusive, royalty-bearing license to make, use and sell the small molecule compounds that are modulators of the Wnt signaling
pathway. Curis has retained the rights for ex vivo cell therapy, except in the areas of oncology and hematopoiesis.

Under the terms of the
agreement, the Company has primary responsibility for research and development activities and Genentech is primarily responsible for clinical development, manufacturing, and commercialization of products that may result from the collaboration.
Genentech paid the Company an up-front license fee of $3,000,000 and agreed to fund up to $6,000,000 for research and development activities during the initial two-year research term, subject to its termination rights, with an option to extend the
initial two-year research term for up to two additional years in one-year increments. In January 2007, Genentech informed the Company that it would not extend the research term beyond the initial two-year term ending on March 31, 2007.

The Company applied the provisions of EITF 00-21 and determined that its deliverables represented a single unit of accounting. 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. In developing its original estimate of the Companys level
of effort required to complete its performance obligations, the Company estimated that Genentech would elect twice to extend the research service period and related funding, each in one-year increments, although there was no assurance Genentech
would make such an election. The Company originally estimated that it would provide an equal number of full-time equivalents for the four-year research and development service term. In developing this estimate, the Company assumed that Genentech
would maintain its initially elected number of twelve full-time equivalent researchers throughout the estimated four-year period. The steering committee effort was also expected to be consistent over the estimated four-year period. The $3,000,000
up-front fee plus $12,000,000,the total amount of research funding which the Company would be entitled to for providing twelve full-time equivalents over four years, was being attributed to the research services.



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As a result of Genentechs decision not to extend the research term, the Companys estimated
performance period was changed during the fourth quarter of 2006 to coincide with the March 31, 2007 research term end date, and the Company accelerated amortization of the unamortized up-front license fee and the remaining amount of research
funding to which the Company was entitled. Revenue for the three- and six-month periods ended June 30, 2006 was recognized as the research services were provided assuming a four-year term through March 2009 at a rate of $312,500 per full-time
equivalent. Revenue for the three-month period ended March 31, 2007 was recognized as the research services were provided at a rate of $562,500 per full-time equivalent, which includes the effect of accelerating revenue recognition on the
unamortized portion of the up-front license fee.

The Company recorded revenue under this collaboration of $1,577,000 and $1,969,000 during
the six-month periods ended June 30, 2007 and 2006, respectively. Of this amount, approximately $938,000 and $375,000 was attributed to the amortization of the up-front license fee and is included in License fees within the Revenue
section of the Companys Consolidated Statement of Operations for the six-month periods ended June 30, 2007 and 2006, respectively. In addition, the Company recorded $639,000 and $1,594,000 related to research services performed by the
Companys full-time equivalent researchers for the six-month periods ended June 30, 2007 and 2006, respectively, and is included within Research and development contracts within the Revenues section of the Companys
Consolidated Statement of Operations. No amounts were recorded as revenue under this collaboration for the three months ended June 30, 2007 and there was no remaining deferred revenue related to this collaboration as of June 30, 2007.

The Company believes that contingent cash payments tied to preclinical, clinical development and drug approval objectives under this
collaboration may not constitute substantive milestones since the successful achievement of these objectives may not meet each of the criteria set forth in the Companys revenue recognition policy related to substantive milestones. However,
because the Company has no future deliverables under the agreement, it expects to recognize any such contingent payments as revenue in License fees in the Companys Revenues section of its Consolidated Statement of Operations if and
when the milestones are met.

5. Termination of September 2005 Procter & Gamble Collaboration

On September 18, 2005, the Company entered into a collaboration, research and license agreement with Procter & Gamble to evaluate and seek
to develop potential treatments for hair growth regulation and skin disorders utilizing the Companys Hedgehog agonist technology.

Under the terms of the agreement, the Company granted Procter & Gamble an exclusive, worldwide, royalty-bearing license for the development and commercialization of topical dermatological and hair growth products that incorporate
the Companys Hedgehog agonist technology. In accordance with the terms of the agreement, the parties agreed to jointly undertake a research program with the goal of identifying one or more compounds to be developed and commercialized by
Procter & Gamble.

Under the agreement, Procter & Gamble paid the Company an up-front license fee of $500,000 and agreed
to fund up to $600,000 for two Curis full-time equivalents providing research and development activities during the initial one-year research term. In September 2006, Procter & Gamble exercised its option to extend additional research
funding through September 2007 for one-third of a full-time equivalent for $83,000.

The Company applied the provisions of Emerging Issues
Task Force Issue No. 00-21 and determined that its deliverables represented a single unit of accounting. Because the Company could not reasonably estimate the total level of effort required over the performance period, it was recognizing revenue on
a straight-line basis over the performance period, which it had originally estimated to be six years through September 2011. The original performance period was based on the Companys expectation that it would exercise a co-development option
under the agreement, which provided that the Company would jointly fund development costs and participate on a clinical development steering committee through Phase IIb clinical trials. The steering committee effort was also expected to be
consistent over the performance period. The Company has attributed an aggregate of



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$2,183,000 to the undelivered research and steering committee services. This amount is comprised of (i) a $500,000 up-front fee, (ii) $683,000 in
research funding, and (iii) a $1,000,000 contingent cash payment that the Company received in March 2006 upon the achievement of a preclinical development objective.

On May 9, 2007, Procter & Gamble notified the Company of Procter & Gambles decision to terminate the collaboration effective November 9, 2007. As a result of Procter &
Gambles decision to terminate the license agreement, the Companys estimated performance period was changed during the second quarter of 2007 to coincide with the November 9, 2007 termination date, and the Company accelerated
amortization of the unamortized up-front license fee and the remaining amount of research funding to which the Company was entitled.

The
Company recorded revenue under this collaboration of $823,000 and $475,000 during the six-month periods ended June 30, 2007 and 2006, respectively. Of this amount, approximately $549,000 and $102,000 was attributed to the amortization of the
$500,000 up-front license fee and the $1,000,000 contingent cash payment received in March 2006 and is included in License fees within the Revenue section of the Companys Consolidated Statement of Operations for the six-month
periods ended June 30, 2007 and 2006, respectively. Of the remaining amounts, $235,000 and $50,000 were related to research services performed by the Companys full-time equivalents for the six months ended June 30, 2007 and 2006,
respectively, and $39,000 and $323,000 for the six months ended June 30, 2007 and 2006, respectively, related to expenses incurred on behalf of Procter & Gamble by the Company for which Procter & Gamble is obligated to
reimburse the Company and have met the revenue recognition provisions of EITF 99-19. These amounts are included within the Research and development contracts line item within the Revenues section of the Companys Consolidated
Statement of Operations. As of June 30, 2007, the Company had recorded in its consolidated balance sheet $987,000 in short-term deferred revenue related to this collaboration.

6. Termination of November 2002 Ortho Biotech License Agreement

In November 2002, the Company
licensed certain of its broad bone morphogenetic protein, or BMP, technology portfolio to Ortho Biotech Products, L.P., a member of the Johnson & Johnson family of companies. The transaction related to all of the Companys proprietary
BMP compounds including BMP-7, which has been studied in animal models as a treatment for chronic kidney disease and systemic complications, such as renal osteodystrophy, a form of bone disease, and blood vessel complications that have been
associated with chronic kidney disease.

On May 18, 2007, Ortho Biotech Products provided Curis with written notice that it intends to
terminate the license agreement. Pursuant to the license agreement, the agreement will terminate 90 days from this notice, or on August 16, 2007. On the termination date, the licenses granted by Curis to Ortho Biotech Products shall terminate.
The Company intends to seek to license this technology to a third party collaborator. No amounts were recorded as revenue under this collaboration for the three and six months ended June 30, 2007 and 2006, and there is no remaining deferred
revenue related to this collaboration as of June 30, 2007.

7. Accrued Liabilities

Accrued liabilities consist of the following:



|                       |  |              |           |                  |   |          
|---------------------- |  | ------------ | --------- | ---------------- | - | ---------
|                       |  | June 30,2007 |           | December 31,2006
|Accrued compensation   |  | $            | 648,000   |                  | $ | 578,000  
|Professional fees      |  |              | 161,000   |                  |   | 200,000  
|Facility-related costs |  |              | 237,000   |                  |   | 484,000  
|Other                  |  |              | 129,000   |                  |   | 267,000  
|                       |  |              |           |                  |   |          
|Total                  |  | $            | 1,175,000 |                  | $ | 1,529,000
|                       |  |              |           |                  |   |          



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8. Investments in Privately-Held Companies

As of June 30, 2007, the Company holds equity investments in two privately-held former collaborators of the Company, Aegera Therapeutics and ES Cell
International (ESI). Equity investments in privately-held companies are reflected in the accompanying consolidated financial statements at cost, as adjusted for impairment. On a quarterly basis, the Company re-evaluates its investments
in privately-held companies to determine if the carrying values have been impaired. During the quarter ended June 30, 2007, the Company determined that the carrying value of ESIs stock recorded at the Companys consolidated balance
sheet was in excess of the fair value of the asset. Accordingly, the Company recorded a charge to Other expense of $145,000 by writing down the carrying value of its investment in ESI equity securities to $5,000 during the quarter ended
June 30, 2007.

9. Property and Equipment

In the fourth quarter of 2006, the Company initiated a realignment of its research programs, shifting its focus to its later-stage preclinical drug development programs and de-emphasizing its discovery research programs. The Company revised
its estimates of the depreciable lives on the remaining equipment being used in its discovery screening research programs as a result of two of the Companys discovery programs ending during 2006. Beginning in the fourth quarter of 2006,
equipment with a net book value of $988,000 was being depreciated over a period ending in December 2008.

In March 2007, the Companys
BMP-7 small molecule screening agreement with Centocor (a Johnson & Johnson subsidiary) concluded in accordance with the terms of contract. Under the terms of the screening agreement, Centocor maintained an option to exclusively negotiate a
broader BMP-7 screening agreement. However, during the second quarter of 2007, Centocor notified the Company that it would not opt to negotiate a further BMP-7 small molecule agreement. The BMP-7 small molecule screening program was the only
remaining program utilizing the majority of the Companys existing discovery screening equipment.

The Company determined that it
would not fund the program internally and, as a result, during the three months ended June 30, 2007, recorded property and equipment impairment charges of $318,000, which is net of estimated proceeds of $100,000, because this discovery
equipment could not be used on other ongoing programs. This impairment charge has been reported within the Research and development line item within the Expenses section of the Companys Consolidated Statement of Operations for the
three and six months ended June 30, 2007.

10. Long-Term Debt

Long-term debt, including accrued interest, consists of the following at June 30, 2007 and December 31, 2006:



|                                                          |  |               |            |   |                  |   |            |  
|--------------------------------------------------------- |  | ------------- | ---------- | - | ---------------- | - | ---------- | -
|                                                          |  | June 30, 2007 |            |   | December 31,2006 |  
|Notes payable to financing agencies for capital purchases |  | $             | 1,156,000  |   |                  | $ | 1,980,000  |  
|Lesscurrent portion                                      |  |               | (1,116,000 | ) |                  |   | (1,246,000 | )
|                                                          |  |               |            |   |                  |   |            |  
|Total long-term debt obligations                          |  | $             | 40,000     |   |                  | $ | 734,000    |  
|                                                          |  |               |            |   |                  |   |            |  

On March 23, 2005, the Company converted $2,250,000 borrowed under an amended loan agreement
with the Boston Private Bank & Trust Company into a 36-month term note that bears interest at a fixed rate of 7.36% for the repayment period. Under the terms of the note payable, the Company is required to make equal monthly payments of
$62,500 plus any accrued interest beginning on May 1, 2005, and extending through the 36-month term.



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On December 9, 2005, the Company converted $1,450,000 borrowed under a separate loan agreement with
the Boston Private Bank & Trust Company into a 36-month term note that bears interest at a fixed rate of 7.95% for the repayment period. Under the terms of the note payable, the Company is required to make equal monthly payments of $40,278
plus any accrued interest beginning on January 1, 2006, and extending through July 2008, due to the early pre-payment of the principal obligation of $202,000 in March 2007.

During the six months ended June 30, 2007, the Company sold certain of its assets with a net book value of $129,000. Gross proceeds from the sale of
these assets were $202,000 and were directly remitted to Boston Private Bank & Trust and applied to the principal obligation outstanding under this loan agreement. None of the terms of the loan were changed as a result of the sale of assets
collateralized under this agreement. The Company also recorded expenses of $5,000 related to this sale resulting in a net gain on sale of assets of $68,000, which was reflected as a reduction of Research and development expenses in the
Companys Consolidated Statement of Operations for the six-month period ended June 30, 2007. Any future proceeds from the sale of collateralized assets will be applied to the Companys outstanding principal obligations under its loan
agreements with the Boston Private Bank & Trust Company.

These loans are collateralized by all of the Companys property,
plant and equipment assets, except for fixtures and those that are purchased after March 23, 2005 under purchase money arrangements with equipment lenders. As of June 30, 2007, the Company is in compliance with the sole covenant under each
of the agreements with the Boston Private Bank & Trust Company. The covenant requires the Company to maintain a minimum working capital ratio. Should the Company fail to pay amounts when due or fail to maintain compliance with the covenant
under the agreements, the entire obligation becomes immediately due at the option of the Boston Private Bank & Trust Company.

11. Accounting
for Stock-Based Compensation

As of June 30, 2007, the Company had three shareholder-approved, share-based compensation plans: the
2000 Stock Incentive Plan (the 2000 Plan), the 2000 Director Stock Option Plan (the 2000 Director Plan) and the 2000 Employee Stock Purchase Plan (the ESPP). For a complete discussion of the Companys share-based compensation plans, see Note
2(l) included in its annual report on Form 10-K, as previously filed with the Securities and Exchange Commission on March 2, 2007.

During the quarter ended March 31, 2007, stock options to purchase 330,000 common shares were issued under the 2000 Plan, of which stock options to purchase 280,000 common shares were granted to employees, which vest over a four-year
period, and 50,000 were granted to non-employees. During the quarter ended June 30, 2007, the Companys Compensation Committee of its Board of Directors granted stock options to its employees and executive officers to purchase 1,795,000
shares of its common stock under the 2000 Plan. Of the employee options issued during the quarter ended June 30, 2007, stock options to purchase 151,500 common shares will vest one year from their grant date, stock options to purchase 390,000
common shares will vest over a two-year period and stock options to purchase 641,000 common shares will vest over a four-year period. The remaining stock options to purchase 612,500 common shares were issued to the executive officers of the Company
with a performance condition and will vest on December 6, 2012 or upon the consummation of a collaboration, licensing or other similar agreement regarding the Targeted Cancer Drug Development Platform that includes an up-front cash payment of
at least $10,000,000 excluding any equity investment in the Company, whichever occurs first, subject to the officers continued employment. All employee options were issued with exercise prices equal to the closing market price of the
Companys common stock on the NASDAQ Global Market on the respective grant dates.

During the quarter ended June 30, 2007, the
Companys Board of Directors granted options to purchase 135,000 shares of common stock under the 2000 Plan and options to purchase 30,000 shares of common stock under the 2000 Director Plan to its Board of Directors, which fully vested on the
grant date of June 6, 2007. The exercise price of each of these options is equal to the closing market price of the Companys common stock on the NASDAQ Global Market on the date of grant.



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In addition, the Companys non-employee directors were granted a total of 60,000 shares of common
stock under the 2000 Plan at par value, or $0.01 per share. The closing market price of the Companys common stock on the NASDAQ Global Market on June 6, 2007, the date of the grant, was $1.39 per share. There were no restrictions or
vesting requirements related to these awards. Accordingly, the Company recognized $83,000 in compensation expense related to the issuance of the 60,000 shares of common stock during the second quarter of 2007.

The table below summarizes options outstanding and exercisable under the 2000 Plan and the 2000 Director Plan at June 30, 2007:



|                     |  |                     |  |                                                    |  |                                        |       |                 |           |                                        |   |      
|-------------------- |  | ------------------- |  | -------------------------------------------------- |  | -------------------------------------- | ----- | --------------- | --------- | -------------------------------------- | - | -----
|                     |  | Options Outstanding |  | Options Exercisable                               
|Exercise Price Range |  | Number ofShares     |  | WeightedAverageRemainingContractualLife (in years) |  | WeightedAverageExercise Priceper Share |       | Number ofShares |           | WeightedAverageExercise Priceper Share
|$ 0.56  $ 1.34      |  | 841,594             |  | 6.81                                               |  | $                                      | 1.16  |                 | 510,094   |                                        | $ | 1.06 
|1.39     1.95       |  | 4,491,045           |  | 8.61                                               |  |                                        | 1.49  |                 | 1,488,418 |                                        |   | 1.54 
|2.11     3.95       |  | 2,623,395           |  | 5.16                                               |  |                                        | 2.97  |                 | 2,584,330 |                                        |   | 2.97 
|3.96     5.89       |  | 1,977,174           |  | 6.85                                               |  |                                        | 4.42  |                 | 1,413,755 |                                        |   | 4.52 
|6.91   17.94        |  | 521,063             |  | 3.15                                               |  |                                        | 12.81 |                 | 521,063   |                                        |   | 12.81
|20.00   31.15       |  | 41,063              |  | 0.98                                               |  |                                        | 26.97 |                 | 41,063    |                                        |   | 26.97
|                     |  |                     |  |                                                    |  |                                        |       |                 |           |                                        |   |      
|                     |  | 10,495,334          |  | 6.97                                               |  | $                                      | 3.05  |                 | 6,558,723 |                                        | $ | 3.76 
|                     |  |                     |  |                                                    |  |                                        |       |                 |           |                                        |   |      

Employee Grants

The Company adopted the provisions of Statement of Financial Accounting Standards 123(R), Share-Based Payment (SFAS 123(R)), beginning
January 1, 2006, using the modified prospective transition method. In determining the fair value of stock options, the Company generally uses the Black-Scholes option pricing model. The Company calculated the Black-Scholes value of employee
options awarded during the three and six months ended June 30, 2007 and 2006 based on the assumptions noted in the following table:



|                                |  |                                     |  |                                   |  |          |  |         
|------------------------------- |  | ----------------------------------- |  | --------------------------------- |  | -------- |  | --------
|                                |  | For the three months ended June 30, |  | For the six months ended June 30,
|                                |  | 2007                                |  | 2006                              |  | 2007     |  | 2006    
|Expected term (years)Employees |  | 5.5-7                               |  | 5.5-6.25                          |  | 5.5-7    |  | 5.5-6.25
|Expected term (years)Directors |  | 7                                   |  | 5                                 |  | 7        |  | 5       
|Risk-free interest rate         |  | 4.8-4.9%                            |  | 5.2%                              |  | 4.5-4.9% |  | 4.9-5.2%
|Volatility                      |  | 91-97%                              |  | 100-101%                          |  | 91-97%   |  | 100-102%
|Dividends                       |  | None                                |  | None                              |  | None     |  | None    

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. In determining the
expense recorded in the Companys consolidated statement of operations, the Company has applied an estimated forfeiture rate to the remaining unvested awards based on historical experience, as adjusted. This estimate is evaluated quarterly and
the forfeiture rate is adjusted as necessary. If the actual number of forfeitures differs from those estimated by management, additional adjustments to compensation expense may be required in future periods.

The aggregate intrinsic value of options outstanding at June 30, 2007 was $65,000, of which all related to exercisable options. The weighted average
grant-date fair values of stock options granted during the six months ended June 30, 2007 and 2006 were $1.10 and $1.67, respectively. As of June 30, 2007, there was approximately



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$4,900,000, including the impact of estimated forfeitures, of unrecognized compensation cost related to unvested employee and director stock option awards
outstanding under the 2000 Plan and 2000 Director Plan that is expected to be recognized as expense over a weighted average period of 4.34 years. The intrinsic value of employee stock options exercised during the six months ended June 30, 2007
and 2006 were $13,000 and $2,000, respectively.

For employee stock options with a market performance condition, which was used for a
limited number of stock options issued in June 2002 that remained unvested as of January 1, 2006, the Company uses a lattice-based option valuation model. These awards accounted for $5,000 and $18,000 of the employee stock-based compensation
expense recorded by the Company for the three months ended June 30, 2007 and 2006, respectively, and $20,000 and $36,000 for the six months ended June 30, 2007 and 2006, respectively. All outstanding unvested performance condition awards
will be fully vested in November 2007. The lattice model utilizes assumptions including a 7-year expected life, 2.10% risk-free rate, 116% volatility, and a 0% dividend rate.

During the three- and six-month periods ended June 30, 2007 and 2006, 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 Three MonthsEnded June 30, |  | For the Six MonthsEnded June 30,
|                                           |  | 2007                               |  | 2006                             |  | 2007     |  | 2006    
|Compensation expense recognized under ESPP |  | $18,000                            |  | $22,000                          |  | $38,000  |  | $39,000 
|Expected term                              |  | 6 months                           |  | 6 months                         |  | 6 months |  | 6 months
|Risk-free interest rate                    |  | 4.8-5.0%                           |  | 4.6-5.3%                         |  | 4.8-5.0% |  | 4.6-5.3%
|Volatility                                 |  | 64-71%                             |  | 70-85%                           |  | 64-71%   |  | 70-85%  
|Dividends                                  |  | None                               |  | None                             |  | None     |  | None    

Stock-based compensation for employees for the three and six months ended June 30, 2007 was
calculated using the above valuation models and has been included in the Companys results of operations. 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. Based on basic and diluted weighted average shares outstanding for the three- and six-month periods ended June 30, 2007 and 2006, the effect on the Companys net loss per share of
stock-based compensation expense recorded under SFAS 123(R) was as follows:



|                                                      |  |                                    |            |                                  |   |            |  |      |            |  |   |           
|----------------------------------------------------- |  | ---------------------------------- | ---------- | -------------------------------- | - | ---------- |  | ---- | ---------- |  | - | ----------
|                                                      |  | For the Three Months EndedJune 30, |            | For the Six Months EndedJune 30,
|                                                      |  | 2007                               |            | 2006                             |   | 2007       |  | 2006
|Employee compensation expense recognized              |  | $                                  | 869,000    |                                  | $ | 1,207,000  |  | $    | 1,733,000  |  | $ | 2,038,000 
|Basic and diluted weighted average shares outstanding |  |                                    | 49,408,100 |                                  |   | 49,032,837 |  |      | 49,381,508 |  |   | 48,944,392
|Effect on net loss per share                          |  | $                                  | 0.02       |                                  | $ | 0.02       |  | $    | 0.04       |  | $ | 0.04      

Non-Employee Grants

During the six-month periods ended June 30, 2007 and 2006, the Company 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, ranging from 3.5 months to 4 years from date of grant. In addition, certain non-employee options vest only upon the achievement of performance objectives.
Should the Company terminate the consulting agreements, any unvested options will be cancelled. Options issued to non-employees are marked-to-market at each reporting period, which means that as the Companys stock price fluctuates, the
liability and related expense either increases or decreases. The Company recognized expense of $14,000 and $65,000 related to non-employee stock options for the three and six months ended June 30, 2007, respectively. It



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reversed expense of $94,000 and $162,000 related to non-employee stock options for the three and six months ended June 30, 2006, respectively, as a
result of a decline in the Companys stock price. As of June 30, 2007, the Company had recorded $57,000 in deferred compensation related to unvested non-employee options.

Total Stock-Based Compensation Expense

For the three and six months ended June 30, 2007 and 2006, the Company recorded 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 three monthsended June 30, |         | For the six months endedJune 30,
|                                       |  | 2007                               |         | 2006                             |   | 2007      |  | 2006
|Research and development expenses      |  | $                                  | 87,000  |                                  | $ | 229,000   |  | $    | 329,000   |  | $ | 484,000  
|General and administrative expenses    |  |                                    | 796,000 |                                  |   | 884,000   |  |      | 1,469,000 |  |   | 1,392,000
|                                       |  |                                    |         |                                  |   |           |  |      |           |  |   |          
|Total stock-based compensation expense |  | $                                  | 883,000 |                                  | $ | 1,113,000 |  | $    | 1,798,000 |  | $ | 1,876,000
|                                       |  |                                    |         |                                  |   |           |  |      |           |  |   |          

12. Loss of Subtenant Income

In August 2006, the Companys subtenant to its 61 Moulton Street facility defaulted on the sublease and vacated the property. The Company has been responsible for the lease payments upon default by the subtenant
for which it established a reserve for estimated costs through the lease term which ended April 30, 2007. As of December 31, 2006, this reserve was $245,000 and consisted of the Companys remaining lease obligations and an estimate of
other related facility costs through April 30, 2007.

In the first quarter of 2007, the subtenant entered into a purchase agreement
with a third party for the sale of the subtenants assets, provided that the agreement is not otherwise previously terminated for conditions specified within the purchase agreement. The termination conditions generally apply to certain
insolvency situations of the subtenant, including, among others, a petition in bankruptcy against the subtenant or the subtenants assignment of its assets for the benefit of creditors.

The subtenants total obligation to the Company through the April 30, 2007 sublease term was $368,000. On April 16, 2007, the Company
entered into a settlement agreement with the subtenant under which it has received approximately $262,000 during the second quarter of 2007. The Company increased the reserve by $50,000 for final estimated costs associated with its obligations
through the lease term of April 30, 2007. The remaining $212,000 was applied against General and administrative expenses in the Companys consolidated statement of operations for the six-month period ended June 30, 2007.

During the six months ended June 30, 2007, the Company charged $259,000 against the reserve, which represented the rent obligations
and other related facility expenses incurred by the Company related to the leased space, which is no longer in use. The total reserve for remaining costs of $36,000 is included under Accrued liabilities within Current
liabilities in the Companys consolidated balance sheet as of June 30, 2007, which represents the Companys estimate of final costs associated with the facility that have not yet been billed. Effective April 30, 2007, the
Company vacated the 61 Moulton Street facility.

The subtenant will receive additional contingent cash payments upon the achievement of
certain contractually defined preclinical and clinical development objectives assuming the third party does not terminate the agreement. If the first such objective is achieved and upon the subtenants receipt of such contingent cash payment,
the subtenant would pay the Company the remaining obligation of $106,000. As of June 30, 2007, the Company does not believe that the collection of this amount is reasonably probable and therefore has not been recorded as a receivable in the
consolidated financial statements.



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13. Income Taxes

On January 1, 2007, the Company adopted FASB Interpretation (FIN) No. 48, Accounting for Uncertainty in Income Taxesan interpretation of FASB Statement 109which was issued in July
2006. FIN 48 prescribes a comprehensive model for recognizing, measuring, presenting and disclosing in the financial statements tax positions taken or expected to be taken on a tax return, including a decision whether to file or not to file in a
particular jurisdiction. If there are changes in net assets as a result of application of FIN 48, these will be accounted for as an adjustment to retained earnings. There were no unrecognized tax benefits as of January 1, 2007, the date FIN 48
was adopted.

For the three and six months ended June 30, 2007 and 2006, respectively, the Company did not record any federal or state
tax expense given its continued net operating loss position. As required by Statement of Financial Accounting Standards No. 109, management of the Company has evaluated the positive and negative evidence bearing upon the realizability of its
deferred tax assets, which are comprised principally of net operating losses (NOL), capitalized research and development expenditures and research and development credits (R&D credits). Management has determined that it
is more likely than not that the Company will not recognize the benefits of federal and state deferred tax assets and, as a result, a full valuation allowance was maintained at June 30, 2007 and December 31, 2006.

As of December 31, 2006, the Company had federal and state NOL carryforwards and federal and state R&D credit carryforwards, which may be
available to offset future federal and state income tax liabilities, which expire at various dates starting in 2007 and extending through 2026. Utilization of the NOL and R&D credit carryforwards may be subject to a substantial annual limitation
due to ownership change limitations that have occurred previously or that could occur in the future provided by Section 382 of the Internal Revenue Code of 1986, as well as similar state and foreign provisions. 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. In general, an ownership change, as defined by Section 382, results from transactions increasing the
ownership of certain shareholders or public groups in the stock of a corporation by more than 50 percentage points over a three-year period. Since the Companys formation, the Company has raised capital through the issuance of capital stock on
several occasions (both pre- and post-initial public offering) which, combined with the purchasing shareholders subsequent disposition of those shares, may have resulted in a change of control, as defined by Section 382, or could result
in a change of control in the future upon subsequent disposition. 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
because the Company continues to maintain a full valuation allowance on its NOL and R&D credit carryforwards. In addition, there could be additional changes in control in the future and the Company does not expect to have any taxable income for
the foreseeable future. If the Company has experienced a change of control at any time since its formation, utilization of its NOL or R&D credit carryfowards would be subject to an annual limitation under Section 382 which is determined by
first multiplying the value of the Companys stock at the time of the ownership change by the applicable long-term tax-exempt rate, and then could be subject to additional adjustments, as required. Any limitation may result in expiration of a
portion of the NOL or R&D credit carryforwards before utilization. Further, until a study is completed and any limitation known, no amounts are being presented as an uncertain tax position under FIN 48.

The Companys practice is to recognize interest and/or penalties related to income tax matters in income tax expense. The Company had $0 accrued for
interest and penalties at June 30, 2007.

14. Basic and Diluted Loss Per Common Share

The Company applies SFAS No. 128, Earnings per Share, which establishes standards for computing and presenting earnings per share. Basic and
diluted net losses per share were determined by dividing net loss by the weighted average common shares outstanding during the period. Diluted net loss per common share is the same



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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. Securities consisting of stock options calculated using the treasury stock method, which is weighted based on the number of days outstanding during the respective reporting period and
warrants and shares issuable under the Companys 2000 Employee Stock Purchase Plan were excluded from diluted net loss per common share as they were antidilutive. Antidilutive securities were 10,283,020 and 9,581,584 as of June 30, 2007
and 2006, respectively, consisting of the following:



|                                           |  |                                  |  |          
|------------------------------------------ |  | -------------------------------- |  | ---------
|                                           |  | For the six months endedJune 30,
|                                           |  | 2007                             |  | 2006     
|Weighted average stock options outstanding |  | 8,644,209                        |  | 7,868,260
|Warrants outstanding                       |  | 1,630,976                        |  | 1,680,976
|Shares issuable under ESPP                 |  | 7,835                            |  | 32,349   
|                                           |  |                                  |  |          
|Total antidilutive securities              |  | 10,283,020                       |  | 9,581,585
|                                           |  |                                  |  |          

15. Related Party Transactions

Under its August 23, 2006 consulting agreement, as amended, and its September 14, 2006 Scientific Advisory and Consulting Agreement with Joseph
M. Davie, Ph.D., M.D., a member of the Companys Board of Directors, the Company incurred $8,000 and $14,000 in related consulting expenses in its consolidated statement of operations for the three- and six-month periods ended June 30,
2007, respectively. The August 2006 consulting agreement terminated in accordance with its term in June 2007, and the September 2006 consulting agreement extends through September 2011, unless terminated earlier in accordance with its terms.

16. New Accounting Pronouncements

In
February 2007, the FASB issued Statement of Financial Accounting Standards No. 159 (SFAS No. 159). SFAS No 159, which amends SFAS No. 115, allows certain financial assets and liabilities to be recognized, at the
Companys election, at fair market value, with any gains or losses for the period recorded in the statement of income. SFAS No. 159 includes available-for-sales securities in the assets eligible for this treatment. Currently, the
Company records the gains or losses for the period in the statement of comprehensive income and in the equity section of the balance sheet. SFAS No. 159 is effective for fiscal years beginning after November 15, 2007, and interim
periods in those fiscal years. While the Company is currently evaluating the provisions of SFAS No. 159, the adoption is not expected to have a material impact on its consolidated financial statements.

In June 2007, the FASB issued EITF Issue No. 07-3 (EITF 07-3), Accounting for Advance Payments for Goods or Services to Be Used
in Future Research and Development Activities. EITF 07-3 is limited to non-refundable advance payments for goods and services to be used or rendered in future research and development activities pursuant to an executory contractual
arrangement. The EITF affirms that these payments should be capitalized and deferred until the goods have been delivered or the related services have been performed. EITF 07-3 is effective for fiscal years beginning after December 15,
2007, and interim periods in those fiscal years. The Company does not expect the adoption of EITF 07-3 to have a material impact on its consolidated financial statements.



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|Item 2. | MANAGEMENTS DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND  RESULTS OF OPERATIONS
|------- | --------------------------------------------------------------------------------------

The following discussion of our financial condition and results of operations should be read in conjunction with the condensed consolidated financial
statements and the related notes appearing elsewhere in this report.

Overview

We are a drug discovery and development company that is seeking to leverage our innovative biological signaling pathway drug technologies to create new
targeted medicines primarily in the field of cancer, and also to treat several other medical indications for which there are substantial unmet therapeutic needs. Biological signaling pathways, also referred to as signaling pathways, are prominent
regulators of specific tissue and organ formation during prenatal development and are used by the body throughout life to repair and regulate human tissue. In certain diseases such as cancer, signaling pathways may be abnormally activated or
de-activated. Our product development approach involves using small molecules, proteins or antibodies to modulate these regulatory signaling pathways, for example, to increase the pathway signals when they are insufficient or to decrease them when
they are excessive. In expanding our drug development efforts in the field of cancer, we are building upon our previous experiences in targeting signaling pathways under our current programs in the areas of cancer, neurological disease and
cardiovascular disease.

Since our inception, we have funded our operations primarily through license fees, research and development
funding from our strategic collaborators, the private and public placement of our equity securities, debt financings and the monetization of certain royalty rights. We have never been profitable and have incurred an accumulated deficit of
$696,422,000 as of June 30, 2007. We expect to incur significant operating losses for the next several years as we devote substantially all of our resources to research and development of our product candidates. We will need to generate
significant revenues to achieve profitability and do not expect to achieve profitability in the foreseeable future, if at all. A key driver to our success will be our ability to successfully advance the preclinical development of our internally
developed Targeted Cancer Drug Development Platform programs, to commence and complete clinical trials, both for our internally developed programs and our programs under development in collaboration with our strategic collaborators, and to
successfully commercialize products on the basis of these programs.

Our Proprietary Research and Development Programs

Our internally developed Targeted Cancer Drug Development Platform programs are primarily focused upon designing multiple classes of multi-target drugs
for cancer therapy. For a majority of these drug programs, compounds are being designed by covalently linking at least two active drug components, or pharmacophores. Each pharmacophore targets at least one distinct clinically validated cancer
target, where Target A remains constant throughout all programs currently under development at Curis, and the other target(s) is a different clinically validated or promising cancer target that varies between programs. Using this platform, a number
of individual multi-target inhibitor programs have been initiated to develop inhibitors against a diverse range of cancer targets. We have filed several patent applications covering our multi-target inhibitor programs, including an omnibus
application covering the dual pharmacophore concept and several species filings relating to specific classes of compounds.

In the first
quarter of this year we announced the selection of our first development candidate, CUDC-101, from the Targeted Cancer Drug Development Platform. CUDC-101 is a multi-target small molecule that is designed to inhibit three clinically validated cancer
targets: the Epidermal Growth Factor Receptor (EGFR), Her2, and an undisclosed Target A. To date, we have decided not to disclose Target A for proprietary reasons. We filed a broad series of patents in September 2006 and the one-year provisional
period on these original patent filings ends in September 2007. We currently anticipate that we will disclose the identity of Target A after such provisional period lapses. We have initiated formulation and other IND-preparatory preclinical drug
development activities. Preliminary preclinical toxicology testing has shown CUDC-101 to be well tolerated and we expect that formal toxicology testing will be initiated early in the fourth quarter of 2007. Assuming the successful



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completion of these preclinical studies, we expect to file an IND application with the FDA in the first quarter of 2008. In addition, we expect that we will
select an additional development compound from our Targeted Cancer Drug Development Platform in late 2007. Assuming that we meet this selection date and that subsequent preclinical studies are successful, we anticipate that we will file an IND
application for this second development candidate by the end of 2008. We also currently plan to select at least one additional development compound from this platform in 2008.

Going forward, we intend to hire clinical development and regulatory employees in 2007 and beyond and we will seek to advance one or more of our
proprietary multi-target cancer programs into at least the early stages of clinical testing on our own. We also plan to continue to seek corporate collaborators for the further development and commercialization of at least one of our multi-target
cancer programs from this platform. When evaluating potential collaborative opportunities, we plan to seek to retain significant rights and involvement and/or control in at least the early stages of clinical development. We are currently meeting
with potential collaborators for CUDC-101, but we are not in any advanced negotiations, with new or existing collaborators, relating to this or other programs.

Our Research and Development Programs under Collaboration

Hedgehog Collaborations:

We currently have strategic collaborations with Genentech and Wyeth to develop therapeutics that modulate the signaling of the Hedgehog
pathway. Our June 2003 collaboration with Genentech includes our most advanced program, , a small molecule antagonist of the Hedgehog signaling pathway that is currently in Phase I clinical testing. Genentech is currently conducting a 50-patient
phase I clinical trial to test a systemically administered Hedgehog antagonist in cancer. The primary objectives of the phase I clinical trial are to evaluate the safety and tolerability of escalating doses of the phase I molecule and to establish
the maximum tolerated dose and dose limiting toxicities and to characterize the pharmacokinetic and pharmacodynamic properties of the drug candidate. The patient population is selected from adults with locally advanced or metastatic solid tumors
that have relapsed after first and second line therapy or for whom no clinically beneficial therapy exists. Research and development efforts under this Genentech collaboration are ongoing at Genentech.

Our January 2004 collaboration with Wyeth is currently focused on the development of Hedgehog agonists, which include both small molecule and Hedgehog
protein-based therapeutic candidates, for use in treating neurologic disorders such as stroke and for cardiovascular disease indications. Both of these programs are currently in preclinical development with research being conducted at Wyeth and
Curis. Wyeth is currently providing research funding for five researchers under this collaboration through February 9, 2008.

Other
Collaborations:

In addition to our Hedgehog antagonist collaboration, in April 2005 we entered into a second collaboration with
Genentech focused on the discovery and development of small molecule compounds that modulate the Wnt signaling pathway. We conducted research activities under this collaboration from April 2005 until March 2007, upon which Genentech assumed all
future responsibility for the remaining future development of this program. We do not expect that we will receive future research funding under this program. Future revenues, if any, under this collaboration will be recognized for any contingent
cash payments that we would receive should Genentech advance drug candidates under this collaboration to certain development objectives. We are also eligible to receive royalties on product sales, should any products under this collaboration be
successfully commercialized.

In September 2005, we entered into a collaboration agreement with Procter & Gamble, which was
principally focused on the development of topically applied Hedgehog agonist compounds for hair growth regulation. On May 9, 2007, Procter & Gamble notified us of its decision to terminate this collaboration agreement. Pursuant to the
collaboration agreement, the agreement will terminate in six months from the date of notice, or November 9, 2007. We currently do not expect to further develop Hedgehog agonist compounds for hair growth regulation.



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In November 2002, we entered into an agreement with Ortho Biotech Products in which Ortho Biotech
obtained the exclusive rights to develop and commercialize products based on our BMP-7 technology. On May 18, 2007, Ortho Biotech Products provided us with written notice that it intends to terminate this license agreement. Pursuant to the
license agreement, the agreement will terminate 90 days from this notice, or on August 16, 2007. On the termination date, the licenses granted by us to Ortho Biotech Products shall terminate and we are free to re-license the technology. We
intend to seek to license this technology to a third party collaborator.

Our current collaborations, which include our two agreements with
Genentech and our collaboration with Wyeth generally provide for our research, development and commercialization programs to be wholly or majority funded by our collaborators and provide us with the opportunity to receive additional payments
principally if specified development and regulatory approval objectives are achieved. We are also entitled to receive royalty payments upon the successful commercialization of any products based upon the collaboration. These strategic collaboration
and license agreements include over $500,000,000 in contingent cash payments that are tied principally to the achievement of future development objectives and regulatory approval objectives. We cannot assume that any of such objectives will be
achieved in a timely manner, if at all. As of June 30, 2007, we have received $3,250,000 in contingent cash payments under our existing collaborations.

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 other product 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, the timing of the receipt of payments from collaborators and the cost and outcome of any clinical trials then being conducted. We anticipate that
existing capital resources at June 30, 2007, together with the payment of all contractually-defined research funding payments but excluding any cash payments that are contingent upon the achievement of defined development objectives under our
collaborations and research programs with Wyeth, assuming this contract is not earlier terminated, should enable us to maintain current and planned operations into the fourth quarter of 2008. Our ability to continue funding our planned operations
into and beyond into the fourth quarter of 2008 is dependent upon the success of our collaborations, our ability to control our cash burn rate and our ability to raise additional funds through equity, debt or other sources of financing. A discussion
of certain risks and uncertainties that could affect our liquidity, capital requirements and ability to raise additional funds is set forth under Item 1A, Risk Factors.

Revenue. We do not expect to generate any revenue from the sale of products for several years, if ever. Substantially all of our gross
revenues to date have been derived from license fees, research and development payments, and other amounts that we have received from our current and former strategic collaborators and licensees. Our share of the co-development costs for our basal
cell carcinoma program were recorded as a reduction to any revenue recognized under our collaborations with Genentech in accordance with EITF 01-9. On August 31, 2006, we ceased our participation in co-development and we do not expect to record
any additional contra-revenues. Genentech will be solely responsible for all development decisions and costs subsequent to August 31, 2006, and we are entitled to cash payments upon the occurrence of certain development objectives and royalties
on product sales, if any should occur.

Our current third-party research funding consists solely of payments by Wyeth for five researchers
through February 9, 2008. Accordingly, for the majority of our programs under collaboration, our future revenues are limited to (i) the amortization of previously received license payments, (ii) potential future cash payments, if any,
that are contingent upon the successful completion principally of contractually defined development and regulatory approval objectives, and (iii) royalty payments upon the successful commercialization of any products based upon the
collaboration.

In the future, we will seek to generate revenues from a combination of license fees, research and development funding,
milestone payments and royalties resulting from strategic collaborations relating to the development of products that incorporate our intellectual property, and from sales of any products that we successfully develop and commercialize, either alone
or in collaboration. We expect that any revenues we



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generate will fluctuate from quarter to quarter as a result of the timing and amount of payments, if any, received under our existing and any future
strategic collaborations and license arrangements, and the amount and timing of payments that we receive upon the sale of our products, to the extent that any are successfully commercialized.

Research and Development. Research and development expense consists of costs incurred to discover, research and develop our product
candidates. These expenses consist primarily of salaries and related expenses for personnel including stock-based compensation expense for employee share-based payments. Research and development expenses also include the costs of supplies and
reagents, outside service costs including medicinal chemistry, consulting, and occupancy and depreciation charges. We expense research and development costs as incurred. We believe that our research and development expenses will neither increase nor
decrease significantly in 2007 as compared to 2006. We expect, however, that a majority of our research and development effort and expense will continue to shift from our work primarily in the Hedgehog pathway and our various discovery programs, to
the development of programs under our Targeted Cancer Drug Development Platform. We also expect that in the near-term we will maintain approximately the same number of researchers as we currently employ, but will increase our clinical development
and regulatory capacities. In addition, in the near-term we expect to continue contracting between 20-30 medicinal chemists in an effort to rapidly advance our programs under the Targeted Cancer Drug Development Platform.

Except for our systemically administered Hedgehog antagonist program, our programs are in various stages of preclinical drug development. The table below
summarizes our primary research and development programs, including the current development status of each program. The terms used in the chart below are as follows:



| |  |  | Phase I means that we or a collaborator are currently treating human patients in a phase I clinical trial, the principal purpose of which is to evaluate the safety
of the compound being tested;
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Development candidate means that from our preclinical testing in several 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 that we are seeking to complete the relevant safety, toxicology, and other data required to file an investigational new drug application with the FDA seeking to commence
a phase I clinical trial;
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Preclinical means we are seeking to obtain demonstrations of therapeutic efficacy in preclinical models of human disease of one or more compounds within a
particular class of drug candidates; and
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Discovery means that we are searching for compounds that may be relevant for treating a particular disease area.
| | - |  | ----------------------------------------------------------------------------------------------------------------



|                                           |  |                                    |  |                        |  |                     
|------------------------------------------ |  | ---------------------------------- |  | ---------------------- |  | --------------------
|Product Candidate                          |  | Primary Indication                 |  | Collaborator/Licensee  |  | Status              
|Hedgehog systemic small molecule           |  | Cancer                             |  | Genentech              |  | Phase I             
|CUDC-101                                   |  | Cancer                             |  | Internal Development   |  | Developmentcandidate
|Multi-target inhibitors                    |  | Cancer                             |  | Internal Development   |  | Preclinical         
|Hedgehog systemic antibody antagonist      |  | Cancer                             |  | Genentech              |  | Preclinical         
|Wnt signaling pathway                      |  | Cancer                             |  | Genentech              |  | Discovery           
|Hedgehog small molecule agonist or protein |  | Nervous system disorders           |  | Wyeth                  |  | Preclinical         
|BMP-7 protein (1)                          |  | Kidney disease and other disorders |  | Ortho Biotech Products |  | Preclinical         
|Hedgehog protein/agonist                   |  | Cardiovascular disease             |  | Wyeth                  |  | Preclinical         

---

|(1) | On May 18, 2007, Ortho Biotech Products provided us with written notice that it intends to terminate our November 2002 BMP-7 license agreement. Pursuant to the license
agreement, the agreement will terminate 90 days from this notice, or on August 16, 2007. On the termination date, the licenses granted by us to Ortho Biotech Products shall terminate and we are free to re-license the technology.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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Because of the early stages of development of these programs, our ability and that of our collaborators
and licensors to successfully complete preclinical and clinical studies of these product candidates, and the timing of completion of such programs, is highly uncertain. There are numerous risks and uncertainties associated with developing drugs,
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 clinical trials;
| | - |  | --------------------------------------



| |  |  | the terms and timing of any collaborative, licensing and other arrangements that we may establish;
| | - |  | --------------------------------------------------------------------------------------------------



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



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



| |  |  | the cost of establishing clinical and commercial supplies of our product 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 product candidates. Any failure to complete the development of our product 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 below in Part IItem 1A, Risk Factors.

General and Administrative. General and administrative expense consists primarily of salaries and other related costs for personnel in executive, finance, accounting, business development, legal,
information technology, corporate communications and human resource functions. These expenses include stock-based compensation expense for employee share-based payments. Other costs include facility costs not otherwise included in research and
development expense, insurance, and professional fees for legal, patent and accounting services.

Strategic Collaborations and License
Agreements. Since inception, substantially all of our revenues have been derived from collaborations and other research and development arrangements with third parties. As of June 30, 2007, we have ongoing collaborations with Genentech
(June 2003 Hedgehog Antagonist, April 2005 Wnt Signaling) and Wyeth Pharmaceuticals (January 2004 Hedgehog Agonist). For a detailed discussion of these arrangements, please see Managements Discussion and Analysis of Financial Condition
and Results of Operations  Strategic Alliances and License Agreements in our annual report on Form 10-K for the year ended December 31, 2006, which is on file with the Securities and Exchange Commission, or SEC.

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 collectibility of receivables and the value of certain investments and
liabilities. 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



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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. We set forth our critical accounting policies and estimates in our annual report on Form 10-K for the year ended December 31, 2006, which is on file with the SEC. The following
sets forth material changes in our critical accounting policies and estimates described therein.

Long-lived assets:Long-lived
assets consist of goodwill, equity securities held in privately-held companies and property and equipment. In the ordinary course of our business, we incur substantial costs related to property and equipment. 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.

We assess the impairment of identifiable long-lived assets whenever events or changes in circumstances indicate that the carrying
value may not be recoverable. 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 SFAS No. 144, Accounting for the Impairment or Disposal of Long-Lived Assets. During 2006, we initiated a realignment of our research programs, focusing on later-stage preclinical drug development programs and de-emphasizing our
earlier discovery research programs. As a result, in 2006 we recorded an impairment charge of $148,000 related to certain of our equipment that was no longer used in our discovery or other programs. In addition, we revised our estimates of the
depreciable lives on the remaining equipment currently being used in our discovery research programs as a result of two of our discovery screening programs ending in late 2006 and early 2007.

In March 2007, our BMP-7 small molecule screening agreement with Centocor (a Johnson & Johnson subsidiary) concluded in accordance with the
terms of contract. Under the terms of the screening agreement, Centocor maintained an option to exclusively negotiate a broader BMP-7 screening agreement. However, during the second quarter of 2007, Centocor notified us that it would not opt to
negotiate a further BMP-7 small molecule agreement. The BMP-7 small molecule screening program was the only remaining program utilizing the majority of our existing discovery screening equipment.

We determined that we would not fund the program internally and, during the three months ended June 30, 2007, recorded property and equipment
impairment charges of $318,000, which is net of estimated proceeds of $100,000, because this discovery could not be used on other ongoing programs. Proceeds from the sale of this equipment will be applied to our outstanding debt obligations with the
Boston Private Bank & Trust Company. This impairment charge has been reported within the Research and development line item within the Expenses section of the Companys Consolidated Statement of Operations for the three and
six months ended June 30, 2007. We will continue to review our estimates of remaining useful lives related to assets currently being used on our remaining programs. Any future changes to the estimated useful lives of our assets could have a
material impact on our financial statements.

As of June 30, 2007, we also hold equity investments in two privately-held former
collaborators, Aegera Therapeutics and ES Cell International (ESI). Equity investments in privately-held companies are reflected in the accompanying consolidated financial statements at a value based on our best estimate of the fair
value of such investments. When determining the fair values of such investments, we generally consider such factors as the fair value paid by outside investors for similar equity in such companies, the liquidity of the investment and both
company-specific and macroeconomic factors that may have affected values since the last such investment by outside investors. On a quarterly basis, we re-evaluate our investments in privately-held companies to determine if its carrying value has
been impaired. During the quarter ended June 30, 2007, we determined that the carrying value of ESIs stock was in excess of the fair value of the asset. Accordingly, we recorded a charge of $145,000 by writing down the carrying value of
our investment in ESI equity securities to $5,000 during the quarter ended June 30, 2007.



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The above list is not intended to be a comprehensive list 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.

Recently Issued Accounting Standards

In February 2007, the FASB issued Statement of Financial Accounting Standards No. 159 (SFAS No. 159). SFAS No 159, which
amends SFAS No. 115, allows certain financial assets and liabilities to be recognized, at our election, at fair market value, with any gains or losses for the period recorded in the statement of income. SFAS No. 159 includes
available-for-sales securities in the assets eligible for this treatment. Currently, we record the gains or losses for the period in the statement of comprehensive income and in the equity section of the balance sheet. SFAS No. 159 is
effective for fiscal years beginning after November 15, 2007, and interim periods in those fiscal years. While we are currently evaluating the provisions of SFAS No. 159, the adoption is not expected to have a material impact on our
consolidated financial statements.

In June 2007, the FASB issued EITF Issue No. 07-3 (EITF 07-3), Accounting for
Advance Payments for Goods or Services to Be Used in Future Research and Development Activities. EITF 07-3 is limited to non-refundable advance payments for goods and services to be used or rendered in future research and development
activities pursuant to an executory contractual arrangement. The EITF affirms that these payments should be capitalized and deferred until the goods have been delivered or the related services have been performed. EITF 07-3 is effective for
fiscal years beginning after December 15, 2007, and interim periods in those fiscal years. We do not expect the adoption of EITF 07-3 to have a material impact on our consolidated financial statements.

Results of Operations

Three-Month Periods
Ended June 30, 2007 and June 30, 2006

Revenues.Total revenues are summarized as follows:



|                                                   |  |                                    |           |             |                                 |           |   |  |      |   
|-------------------------------------------------- |  | ---------------------------------- | --------- | ----------- | ------------------------------- | --------- | - |  | ---- | --
|                                                   |  | For the Three Months EndedJune 30, |           |             | Percentage Increase/ (Decrease) |          
|                                                   |  | 2007                               |           | 2006        |                                 |          
|                                                   |  | (unaudited)                        |           | (unaudited) |                                 |           |   | 
|REVENUES:                                          |  |                                    |           |             |                                 |           |   |  |      |   
|Research and development contracts                 |  |                                    |           |             |                                 |           |   |  |      |   
|Genentech                                          |  | $                                  | 45,000    |             | $                               | 1,324,000 |   |  | (97  | %)
|Wyeth                                              |  |                                    | 374,000   |             |                                 | 618,000   |   |  | (39  | %)
|Procter & Gamble                                   |  |                                    | 242,000   |             |                                 | 321,000   |   |  | (25  | %)
|Centocor                                           |  |                                    |          |             |                                 | 100,000   |   |  | (100 | %)
|Spinal Muscular Atrophy Foundation                 |  |                                    |          |             |                                 | 420,000   |   |  | (100 | %)
|Other                                              |  |                                    | 21,000    |             |                                 |          |   |  | 100  | % 
|                                                   |  |                                    |           |             |                                 |           |   |  |      |   
|Subtotal                                           |  |                                    | 682,000   |             |                                 | 2,783,000 |   |  | (75  | %)
|License fees                                       |  |                                    |           |             |                                 |           |   |  |      |   
|Genentech                                          |  |                                    |          |             |                                 | 188,000   |   |  | (100 | %)
|Wyeth                                              |  |                                    | 64,000    |             |                                 | 68,000    |   |  | (6   | %)
|Procter & Gamble                                   |  |                                    | 483,000   |             |                                 | 66,000    |   |  | 632  | % 
|                                                   |  |                                    |           |             |                                 |           |   |  |      |   
|Subtotal                                           |  |                                    | 547,000   |             |                                 | 322,000   |   |  | 70   | % 
|Gross Revenues                                     |  |                                    | 1,229,000 |             |                                 | 3,105,000 |   |  | (60  | %)
|Contra-revenues from co-development with Genentech |  |                                    |          |             |                                 | (546,000  | ) |  | (100 | %)
|                                                   |  |                                    |           |             |                                 |           |   |  |      |   
|Net Revenue                                        |  | $                                  | 1,229,000 |             | $                               | 2,559,000 |   |  | (52  | %)
|                                                   |  |                                    |           |             |                                 |           |   |  |      |   



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Gross revenues decreased by $1,876,000 to $1,229,000 for the three months ended June 30, 2007 from
$3,105,000 for the same prior year period. This decrease was primarily the result of a decrease in research funding under our collaborations. Two of our research funding arrangements concluded during the fourth quarter of 2006, including the
research funding for our Hedgehog antagonist program under collaboration with Genentech and our research funding with the Spinal Muscular Atrophy Foundation. Research funding under our April 2005 collaboration with Genentech for the Wnt signaling
pathway and research funding under our screening agreement with Centocor concluded during the first quarter of 2007. The termination of research funding under these four arrangements accounted for $1,799,000 of the decrease in research and
development contract revenues. In addition, the number of our scientists for whom we received research funding from Wyeth under our Hedgehog agonist program decreased from eight to five during the first quarter of 2007. We expect that our revenues
recognized under our research and development contracts will continue to decline during 2007 as research funding ended on all existing collaborations other than Wyeth.

Offsetting the decrease in research and development contract revenue, our license revenues increased by $225,000 to $547,000 in the second quarter of 2007 from $322,000 for the same period in 2006. The increase was
the result of the accelerated amortization of license fee revenue under our collaboration with Procter & Gamble, which resulted in additional revenue of $417,000 for the quarter ended June 30, 2007. On May 9, 2007,
Procter & Gamble notified us that it intended to terminate the collaboration agreement effective November 9, 2007, and, as a result, we decreased our estimated performance period under this collaboration from September 2011 to coincide
with the license termination date. This increase was offset by a decrease in license fee revenue of $188,000 recognized under our April 2005 collaboration with Genentech that was fully amortized during the first quarter of 2007.

Contra-revenues decreased for the three months ended June 30, 2007 as compared to the same prior year period. We did not record any contra-revenues
during the second quarter of 2007, as compared to $546,000 recorded in the prior year period. Contra-revenues represent amounts owed for the reimbursement of our equal share of costs incurred by Genentech under our June 2003 Hedgehog Antagonist
collaboration related to the co-development of a topically-applied basal cell carcinoma drug candidate. On August 31, 2006, we ceased our participation in co-development and we do not expect to incur any additional costs related to this program
as Genentech will be solely responsible for all future costs and development decisions regarding the basal cell carcinoma program.

Research and Development Expenses. Research and development expenses are summarized as follows:



|                                          |  |                          |           |                  |   |                                    |           |                               |    |         |  |      |   
|----------------------------------------- |  | ------------------------ | --------- | ---------------- | - | ---------------------------------- | --------- | ----------------------------- | -- | ------- |  | ---- | --
|                                          |  |                          |           |                  |   | For the Three MonthsEnded June 30, |           | PercentageIncrease/(Decrease) |   
|Research and DevelopmentProgram           |  | Primary Indication       |           | Collaborator     |   | 2007                               |           | 2006                          |   
|                                          |  |                          |           |                  |   | (unaudited)                        |           | (unaudited)                   |    |         | 
|CUDC-101                                  |  | Cancer                   |           | Internal         |   | $                                  | 1,066,000 |                               | $  |        |  | 100  | % 
|Single and multi-target inhibitors        |  | Cancer                   |           | Internal         |   |                                    | 962,000   |                               |    | 386,000 |  | 149  | % 
|Hh small molecule and antibody antagonist |  | Cancer                   |           | Genentech        |   |                                    | 21,000    |                               |    | 457,000 |  | (95  | %)
|Wnt signaling pathway                     |  | Cancer                   |           | Genentech        |   |                                    | 9,000     |                               |    | 817,000 |  | (99  | %)
|Hh small molecule agonist                 |  | Nervous system disorders |           | Wyeth            |   |                                    | 399,000   |                               |    | 578,000 |  | (31  | %)
|Hh small molecule agonist                 |  | Hair loss                |           | Procter & Gamble |   |                                    | 2,000     |                               |    | 283,000 |  | (99  | %)
|Discovery research                        |  | Neurological and other   |           | Centocor         |   |                                    | 170,000   |                               |    | 249,000 |  | (32  | %)
|Discovery research                        |  | Spinal muscular atrophy  |           | SMA Foundation   |   |                                    |          |                               |    | 574,000 |  | (100 | %)
|Discovery research                        |  | Various                  |           | Internal         |   |                                    | 13,000    |                               |    | 267,000 |  | (95  | %)
|Impairment of assets                      |  | N/A                      |           |                  |   |                                    | 318,000   |                               |    |        |  | 100  | % 
|Stock-based compensation                  |  | N/A                      |           |                  |   |                                    | 87,000    |                               |    | 229,000 |  | (62  | %)
|                                          |  |                          |           |                  |   |                                    |           |                               |    |         |  |      |   
|Total research and development expense    |  | $                        | 3,047,000 |                  | $ | 3,840,000                          |           | (21                           | %)
|                                          |  |                          |           |                  |   |                                    |           |                               |    |         |  |      |   



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Our research and development expenses decreased by $793,000, or 21%, to $3,047,000 for the three months
ended June 30, 2007 as compared to $3,840,000 for the same period in the prior year. During the fourth quarter of 2006 and first quarter of 2007, research funding concluded on our Hedgehog antagonist and our Wnt signaling pathway programs under
separate collaborations with Genentech, as well as our SMA program under a sponsored research agreement with the SMA Foundation. As a result, our spending on these programs decreased $1,818,000 for the three-month period ended June 30, 2007 as
compared to the same prior year period.

As the research funding concluded on programs under collaboration, we reallocated certain of these
resources to our internal Targeted Cancer Drug Development Platform programs, including CUDC-101 and other single- and multi-target inhibitor drug candidates, which were initiated in the first half of 2006 and accounted for $2,028,000, or 67%, of
our second quarter 2007 research expense compared to $386,000 for the same prior year period. Spending on our collaborator-funded programs with Wyeth for the Hedgehog agonist and Procter & Gamble for our Hedgehog topical agonist decreased
$460,000 as a result of fewer researchers supporting the respective programs.

General and Administrative Expenses. General and
administrative expenses are summarized as follows:



|                                          |  |                                    |           |                               |      |   |           |  |      |   
|----------------------------------------- |  | ---------------------------------- | --------- | ----------------------------- | ---- | - | --------- |  | ---- | --
|                                          |  | For the Three Months EndedJune 30, |           | PercentageIncrease/(Decrease) |     
|                                          |  | 2007                               |           |                               | 2006 |  
|Personnel                                 |  | $                                  | 724,000   |                               |      | $ | 715,000   |  | 1    | % 
|Occupancy and depreciation                |  |                                    | (94,000   | )                             |      |   | 154,000   |  | (161 | %)
|Legal services                            |  |                                    | 291,000   |                               |      |   | 480,000   |  | (39  | %)
|Consulting and professional services      |  |                                    | 352,000   |                               |      |   | 412,000   |  | (15  | %)
|Insurance costs                           |  |                                    | 122,000   |                               |      |   | 105,000   |  | 16   | % 
|Other general and administrative expenses |  |                                    | 168,000   |                               |      |   | 212,000   |  | (21  | %)
|Stock-based compensation                  |  |                                    | 796,000   |                               |      |   | 884,000   |  | (10  | %)
|                                          |  |                                    |           |                               |      |   |           |  |      |   
|Total general and administrative expenses |  | $                                  | 2,359,000 |                               |      | $ | 2,962,000 |  | (20  | %)
|                                          |  |                                    |           |                               |      |   |           |  |      |   

The decrease in general and administrative expenses of $603,000 for the three-month period ended
June 30, 2007 was due to decreases in several areas. Occupancy costs decreased $248,000 as a result of proceeds received under a settlement agreement entered into with a former subtenant that had defaulted on a sublease of our 61 Moulton Street
facility. In addition, our lease on our 61 Moulton Street facility concluded on April 30, 2007, which reduced our overall facilities-related costs during the three months ended June 30, 2007.

In addition, legal costs decreased $189,000 due to decreased patent costs and corporate legal fees associated with the formation of our Chinese
subsidiary. Consulting services also decreased $60,000. Other general and administrative expenses, comprised of travel expenses, temporary help, computer and office supplies, decreased $44,000. Finally, stock-based compensation expense decreased by
$88,000 in the three months ended June 30, 2007 as compared to the same period in the prior year.



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Six-Month Periods Ended June 30, 2007 and June 30, 2006

Revenues. Total revenues are summarized as follows:



|                                                   |  |                                  |           |             |                               |            |   |  |      |   
|-------------------------------------------------- |  | -------------------------------- | --------- | ----------- | ----------------------------- | ---------- | - |  | ---- | --
|                                                   |  | For the Six MonthsEnded June 30, |           |             | PercentageIncrease/(Decrease) |           
|                                                   |  | 2007                             |           | 2006        |                               |           
|                                                   |  | (unaudited)                      |           | (unaudited) |                               |            |   | 
|REVENUES:                                          |  |                                  |           |             |                               |            |   |  |      |   
|Research and development contracts                 |  |                                  |           |             |                               |            |   |  |      |   
|Genentech                                          |  | $                                | 763,000   |             | $                             | 2,682,000  |   |  | (72  | %)
|Wyeth                                              |  |                                  | 828,000   |             |                               | 1,225,000  |   |  | (32  | %)
|Procter & Gamble                                   |  |                                  | 274,000   |             |                               | 373,000    |   |  | (27  | %)
|Centocor                                           |  |                                  | 73,000    |             |                               | 200,000    |   |  | (64  | %)
|Spinal Muscular Atrophy Foundation                 |  |                                  |          |             |                               | 864,000    |   |  | (100 | %)
|Other                                              |  |                                  | 27,000    |             |                               | 12,000     |   |  | 125  | % 
|                                                   |  |                                  |           |             |                               |            |   |  |      |   
|Subtotal                                           |  |                                  | 1,965,000 |             |                               | 5,356,000  |   |  | (63  | %)
|License fees                                       |  |                                  |           |             |                               |            |   |  |      |   
|Genentech                                          |  |                                  | 938,000   |             |                               | 375,000    |   |  | 150  | % 
|Wyeth                                              |  |                                  | 140,000   |             |                               | 136,000    |   |  | 3    | % 
|Procter & Gamble                                   |  |                                  | 549,000   |             |                               | 102,000    |   |  | 438  | % 
|                                                   |  |                                  |           |             |                               |            |   |  |      |   
|Subtotal                                           |  |                                  | 1,627,000 |             |                               | 613,000    |   |  | 165  | % 
|Gross Revenues                                     |  |                                  | 3,592,000 |             |                               | 5,969,000  |   |  | (40  | %)
|Contra-revenues from co-development with Genentech |  |                                  |          |             |                               | (1,372,000 | ) |  | (100 | %)
|                                                   |  |                                  |           |             |                               |            |   |  |      |   
|Net Revenue                                        |  | $                                | 3,592,000 |             | $                             | 4,597,000  |   |  | (22  | %)
|                                                   |  |                                  |           |             |                               |            |   |  |      |   

Gross revenues decreased by $2,377,000 to $3,592,000 for the six months ended June 30, 2007
from $5,969,000 for the same prior year period. This decrease was primarily the result of a decrease in research funding under our collaborations that ended in the fourth quarter of 2006 and first quarter of 2007. The termination of research funding
under these arrangements accounted for $2,910,000 of the decrease in research and development contract revenues. In addition, the number of our scientists for whom we received research funding from Wyeth under our Hedgehog agonist program decreased
from eight to five during the first quarter of 2007. We expect that our revenues recognized under our research and development contracts will continue to decline during 2007 as research funding ended on all existing collaborations other than Wyeth.

Offsetting the decrease in research and development contract revenue, our license revenues increased by $1,014,000 to $1,627,000 in the
first half of 2007 from $613,000 for the same period in 2006. The increase was the result of the accelerated amortization of license fee revenue under changes in our estimated performance period of our April 2005 Wnt signaling pathway collaboration
with Genentech and our September 2005 topical Hedgehog agonist for hair growth regulation with Procter & Gamble. The change in our performance periods under these two collaborations resulted in additional revenue of $1,010,000 for the six
months ended June 30, 2007. In the fourth quarter of 2006, Genentech informed us that we it would not extend research funding under the Wnt signaling pathway collaboration. We had originally estimated that Genentech would extend research
funding for two one-year periods and, as a result of Genentechs election to not extend this research funding, we changed our estimated performance period under our April 2005 collaboration with Genentech from March 2009 to coincide with the
end of the research term of March 31, 2007. Also, on May 9, 2007, Procter & Gamble notified us that it intended to terminate the collaboration agreement and, as a result, we decreased our estimated performance period under this
collaboration from September 2011 to coincide with the license termination date of November 9, 2007.



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##### Table of Contents

Contra-revenues decreased for the six months ended June 30, 2007 as compared to the same prior year
period. We did not record any contra-revenues during the first half of 2007, as compared to $1,372,000 recorded in the prior year period. Contra-revenues represent amounts owed for the reimbursement of our equal share of costs incurred by Genentech
under our collaboration related to the co-development of a basal cell carcinoma drug candidate. On August 31, 2006, we ceased our participation in co-development and we do not expect to incur any additional costs related to this program as
Genentech will be solely responsible for all future costs and development decisions regarding the basal cell carcinoma program.

Research and Development Expenses. Research and development expenses are summarized as follows:



|                                          |  |                          |           |                  |  |                                   |           |                               |             |    |           |  |      |   
|----------------------------------------- |  | ------------------------ | --------- | ---------------- |  | --------------------------------- | --------- | ----------------------------- | ----------- | -- | --------- |  | ---- | --
|                                          |  |                          |           |                  |  | For the Six Months Ended June 30, |           | PercentageIncrease/(Decrease) |            
|Research and Development Program          |  | Primary Indication       |           | Collaborator     |  | 2007                              |           |                               | 2006        |   
|                                          |  |                          |           |                  |  | (unaudited)                       |           |                               | (unadutied) |    |           | 
|CUDC-101                                  |  | Cancer                   |           | Internal         |  | $                                 | 1,066,000 |                               |             | $  |          |  | 100  | % 
|Multi-target inhibitors                   |  | Cancer                   |           | Internal         |  |                                   | 2,667,000 |                               |             |    | 386,000   |  | 591  | % 
|Hh small molecule and antibody antagonist |  | Cancer                   |           | Genentech        |  |                                   | 56,000    |                               |             |    | 1,000,000 |  | (94  | %)
|Wnt signaling pathway                     |  | Cancer                   |           | Genentech        |  |                                   | 635,000   |                               |             |    | 1,549,000 |  | (59  | %)
|Hh small molecule agonist                 |  | Nervous system disorders |           | Wyeth            |  |                                   | 841,000   |                               |             |    | 1,260,000 |  | (33  | %)
|Hh small molecule agonist                 |  | Hair loss                |           | Procter & Gamble |  |                                   | 19,000    |                               |             |    | 561,000   |  | (97  | %)
|Discovery research                        |  | Neurological and other   |           | Centocor         |  |                                   | 432,000   |                               |             |    | 428,000   |  | 1    | % 
|Discovery research                        |  | Spinal muscular atrophy  |           | SMA Foundation   |  |                                   |          |                               |             |    | 1,210,000 |  | (100 | %)
|Discovery research                        |  | Various                  |           | Internal         |  |                                   | 47,000    |                               |             |    | 447,000   |  | (89  | %)
|Gain on sale of assets                    |  | N/A                      |           |                  |  |                                   | (68,000   | )                             |             |    |          |  | (100 | %)
|Impairment of assets                      |  | N/A                      |           |                  |  |                                   | 318,000   |                               |             |    |          |  | 100  | % 
|Stock-based compensation                  |  | N/A                      |           |                  |  |                                   | 329,000   |                               |             |    | 484,000   |  | (32  | %)
|                                          |  |                          |           |                  |  |                                   |           |                               |             |    |           |  |      |   
|Total research and development expense    |  | $                        | 6,342,000 |                  |  | $                                 | 7,325,000 |                               | (13         | %)
|                                          |  |                          |           |                  |  |                                   |           |                               |             |    |           |  |      |   

Our research and development expenses decreased by $983,000, or 13%, to $6,342,000 for the six
months ended June 30, 2007 as compared to $7,325,000 for the same period in the prior year primarily as a result of several funded programs concluding. During the fourth quarter of 2006 and first quarter of 2007, research funding concluded on
our Hedgehog antagonist and our Wnt signaling pathway programs under separate collaborations with Genentech, as well as on our SMA program under a sponsored research agreement with the SMA Foundation. As a result, our spending on these programs
decreased $3,068,000 for the six-month period ended June 30, 2007 as compared to the same prior year period.

As the research funding
concluded on programs under collaboration, we reallocated certain of these resources to our internal Targeted Cancer Drug Development Platform programs, including CUDC-101 under development, which were initiated in the second quarter of 2006 and
accounted for $3,733,000, or 59%, of our 2007 research expense through June 30, 2007 compared to $386,000 for the same prior year period. Spending on our collaborator-funded programs with Wyeth for the Hedgehog agonist and Procter &
Gamble for our Hedgehog topical agonist decreased $961,000 as a result of fewer researchers supporting the respective programs.



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##### Table of Contents

General and Administrative Expenses. General and administrative expenses are summarized as
follows:



|                                          |  |                                  |           |                               |      |   |           |  |      |   
|----------------------------------------- |  | -------------------------------- | --------- | ----------------------------- | ---- | - | --------- |  | ---- | --
|                                          |  | For the Six Months EndedJune 30, |           | PercentageIncrease/(Decrease) |     
|                                          |  | 2007                             |           |                               | 2006 |  
|Personnel                                 |  | $                                | 1,428,000 |                               |      | $ | 1,509,000 |  | (5   | %)
|Occupancy and depreciation                |  |                                  | (20,000   | )                             |      |   | 406,000   |  | (105 | %)
|Legal services                            |  |                                  | 1,052,000 |                               |      |   | 1,091,000 |  | (4   | %)
|Consulting and professional services      |  |                                  | 682,000   |                               |      |   | 820,000   |  | (17  | %)
|Insurance costs                           |  |                                  | 245,000   |                               |      |   | 210,000   |  | 17   | % 
|Other general and administrative expenses |  |                                  | 455,000   |                               |      |   | 420,000   |  | 8    | % 
|Stock-based compensation                  |  |                                  | 1,469,000 |                               |      |   | 1,392,000 |  | 6    | % 
|                                          |  |                                  |           |                               |      |   |           |  |      |   
|Total general and administrative expenses |  | $                                | 5,311,000 |                               |      | $ | 5,848,000 |  | (9   | %)
|                                          |  |                                  |           |                               |      |   |           |  |      |   

The decrease in general and administrative expenses of $537,000 for the six-month period ended
June 30, 2007 was primarily due to a decrease in occupancy costs of $426,000. During the six months ended June 30, 2007, we received $262,000 in proceeds under an April 2007 settlement agreement entered into with a former subtenant that
had defaulted on a sublease of our 61 Moulton Street facility, of which $212,000 was recorded as a reduction of expense. In addition, our lease on our 61 Moulton Street facility concluded on April 30, 2007, which reduced our overall
facilities-related costs.

In addition, professional and consulting services decreased $138,000 as a result of expenses incurred for the
restatement of our prior financial statements during the first quarter of 2006.

Liquidity and Capital Resources

We have financed our operations primarily through license fees 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 June 30, 2007, our
principal sources of liquidity consisted of cash, cash equivalents, and marketable securities of $30,228,000, excluding restricted long-term investments of $202,000. Our cash and cash equivalents are highly liquid investments with a maturity of
three months or less at date of purchase and consist of time deposits and investments in money market funds with commercial banks and financial institutions, short-term commercial paper, and government obligations. We also maintain cash balances
with financial institutions in excess of insured limits. We do not anticipate any losses with respect to such cash balances because the balances are invested in highly rated securities. Our marketable securities are investments with expected
maturities of greater than three months, but less than twelve months, and consist of commercial paper, corporate debt securities, and government obligations.

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, legal fees and our equal share of co-development expenses for a basal cell carcinoma product candidate through August 2006 when we opted out of co-development.

To date, the primary source of our cash flows from operations has been payments received from our collaborators and licensors. In general, our only
source of cash flows from operations for the foreseeable future will be up-front license payments from new collaborations, contingent cash payments for the achievement of development objectives if any are met and funded research and development that
we may receive under collaboration agreements. Except for five researchers who are funded by Wyeth through February 9, 2008, substantially all of our research staff is working on developing drug candidates from our Targeted Cancer Drug



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Development Platform. Accordingly, for the majority of our programs under collaboration, our future revenues are limited to (i) the amortization of
previously received license payments, (ii) potential future cash payments, if any, that are contingent upon the successful completion principally of contractually defined development and regulatory approval objectives, and (iii) royalty
payments upon the successful commercialization of any products based upon the collaboration. The timing of or entrance into any new collaboration agreements and any contingent cash payments under existing collaboration agreements are not assured,
cannot be easily predicted and may vary significantly from quarter to quarter.

Net cash used in operating activities was $5,918,000 for
the six-month period ended June 30, 2007 as compared to $1,826,000 for the six-month period ended June 30, 2006. Cash used in operating activities during the six-month period ended June 30, 2007 was primarily the result of our net
loss of $7,538,000 offset by increases in operating cash resulting from non-cash charges, including stock-based compensation expense of $1,798,000, depreciation of $787,000 and impairment of assets of $463,000 during the six-month period ended
June 30, 2007. In addition, changes in certain operating assets and liabilities offset these increases in operating cash during the six months ended June 30, 2007. Specifically, our accounts payable and accrued liabilities decreased
$724,000 and our deferred revenue decreased $1,989,000 as a result of accelerated license fee amortization under our Genentech and Procter & Gamble collaborations. During the first half of 2007, we also collected $1,059,000 of our accounts
receivable primarily related to our Micromet settlement.

Cash used in operating activities during the six-month periods ended
June 30, 2006 was primarily the result of our net loss for the period partially offset by non-cash charges including stock-based compensation of $1,876,000 and depreciation of $656,000. In addition, increases in operating cash resulted from
changes in certain operating assets and liabilities during the six-month period ended June 30, 2006.

We expect to continue to use
cash in operations as we continue to research and develop certain of our existing product candidates and advance our Targeted Cancer Drug Development Platform programs through preclinical development and, we expect, 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 specified other objectives. We also expect that the increase in cash used will be
partially offset by anticipated payments made under our collaboration with Wyeth through February 9, 2008, assuming this collaboration continues in accordance with its terms.

Investing activities provided cash of $2,918,000 for the six-month period ended June 30, 2007 as compared to $3,854,000 in the six-month period
ended June 30, 2006. Cash generated by investing activities resulted principally from $2,771,000 and $3,924,000 in net investment sales for the six months ended June 30, 2007 and 2006, respectively. In addition, for the six months ended
June 30, 2007, we received $197,000 in net proceeds from the sale of certain of our assets. We currently do not expect to undertake any significant capital projects during 2007.

Financing activities used cash of approximately $663,000 for the six-month period ended June 30, 2007, resulting from repayment of $818,000 on our
notes with the Boston Private Bank & Trust Company, $202,000 of which resulted from the sale of certain of our assets during the quarter. Offsetting this decrease, we received approximately $156,000 as proceeds from the issuance of common
stock. Financing activities used approximately $528,000 of cash for the six-month period ended June 30, 2006, resulting primarily from repayment of $617,000 in debt for the purchase of fixed assets.

On March 23, 2005, we converted $2,250,000 financed under an amended loan agreement with the Boston Private Bank & Trust Company, into a
36-month term note that bears interest at a fixed rate of 7.36% for the repayment period. Under the terms of the note payable, we are required to make equal monthly payments of $62,500 plus any accrued interest beginning on May 1, 2005
extending through the 36-month term.



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##### Table of Contents

On December 9, 2005, we converted $1,450,000 financed under a separate loan agreement with the
Boston Private Bank & Trust Company, into a 36-month term note that bears interest at a fixed rate of 7.95% for the repayment period. Under the terms of the note payable, we are required to make equal monthly payments of $40,278 plus any
accrued interest beginning on January 1, 2006 extending through the 36-month term. During the six months ended June 30, 2007, we sold certain of our assets for which we received $202,000 in gross proceeds. The total proceeds were remitted
to Boston Private Bank & Trust and were applied to the principal obligation outstanding under this loan agreement. None of the terms of the loan were changed as a result of the sale of assets collateralized under this agreement.

These loans are collateralized by all of our property, plant and equipment assets, except for fixtures and those that are purchased after
March 23, 2005 under purchase money arrangements with equipment lenders. As of June 30, 2007, we were in compliance with the sole covenant under each of these financing agreements. The covenant requires us to maintain a minimum working
capital ratio. Should we fail to pay amounts when due or fail to maintain compliance with the covenant under the agreements, the entire obligation becomes immediately due at the option of the Boston Private Bank & Trust Company.

We anticipate that existing capital resources at June 30, 2007, together with the payment of all contractually-defined research funding payments
but excluding any cash payments that are contingent upon the achievement of defined development objectives under our collaborations and research programs with Wyeth, assuming this contract is not earlier terminated, should enable us to maintain
current and planned operations into the fourth quarter of 2008. We expect to incur substantial additional research and development and other costs, including costs related to preclinical studies and clinical trials, for the foreseeable future. Our
ability to continue funding planned operations beyond into the fourth quarter of 2008 is dependent upon the success of our collaborations, our ability to control our cash burn rate and our ability to raise additional funds through entering into
additional corporate collaborations, equity or debt financings, or from other sources of financing. Our ability to generate sufficient cash flows depends on a number of factors, including the ability of either us, or our collaborators, to obtain
regulatory approval to market and commercialize products to treat indications in major commercial markets. We are seeking additional collaborative arrangements and also anticipate that we will seek to raise funds through one or more financing
transactions, if conditions permit. Due to our significant long-term capital requirements, we intend to seek to raise funds through the sale of debt or equity securities when conditions are favorable, even if we do not have an immediate need for
additional capital at such time. Additional financing may not be available or, if available, it may not be available on favorable terms. In addition, the sale of additional debt or equity securities could result in dilution to our stockholders. If
substantial additional funding is not available, our ability to fund research and development and other operations will be significantly affected and, accordingly, our business will be materially and adversely affected.

Off-Balance Sheet Arrangements

We have no
off-balance sheet arrangements as of June 30, 2007.

Inflation

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

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

There have been no material changes to
the information provided under Item 7A Quantitative and Qualitative Disclosures About Market Risk set forth in our Annual Report on form 10-K for the year ended December 31, 2006.



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ITEM 4. 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 June 30, 2007. 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 March 31, 2007, 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.

Changes in Internal Control Over Financial Reporting

No change in our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) occurred during the quarter ended June 30, 2007 that has materially affected, or is
reasonably likely to materially affect, our internal control over financial reporting.



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PART IIOTHER INFORMATION

Item 1A. Risk Factors

You should carefully consider the following risk factors, in addition to other information included
in this quarterly report on Form 10-Q, in evaluating Curis and our business. If any of the following risks occur, our business, financial condition and operating results could be materially adversely affected. The following risk factors restate and
supersede the risk factors previously disclosed in Item 1A. of our Annual Report on Form 10-K for the year ended December 31, 2006.

Factors
That May Affect Results

RISKS RELATING TO OUR FINANCIAL RESULTS AND NEED FOR FINANCING

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

We expect to incur substantial operating losses for the foreseeable future, and we have no current sources of
material ongoing revenue. As of June 30, 2007, we had an accumulated deficit of approximately $696,422,000. If we are not able to commercialize any products, whether alone or with a collaborator, we will not achieve profitability. All of our
product candidates are in early stages of development. As a result, for the foreseeable future, we will need to spend significant capital, particularly on our internally funded proprietary research and development programs in an effort to produce
products that we can commercialize. Even if our collaboration agreements provide funding for a portion of our research and development expenses, we will need to generate significant revenues in order to fund our operations and achieve profitability.
We cannot be certain whether or when this will occur because of the significant uncertainties that affect our business, including the various risks described in this section titled Risk Factors. Our failure to become and remain
profitable may 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 additional financing, which may be difficult to obtain and may result in stockholder dilution.

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 primarily include the need for working capital to:



| |  |  | support our research and development activities for our internal programs, particularly on CUDC-101 and other small molecule multi-targeting inhibitors that we are
seeking to develop under our Targeted Cancer Drug Development Platform;
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | fund our general and administrative costs and expenses; and
| | - |  | -----------------------------------------------------------



| |  |  | potentially expand our infrastructure.
| | - |  | --------------------------------------

We believe that our existing cash, together with the payment of all contractually-defined research funding payments under our collaboration and research program with Wyeth, assuming this contract is not earlier terminated, and working
capital should be sufficient to fund our operations into the fourth quarter of 2008; however, our future capital requirements may vary from what we currently expect. There are factors that may adversely affect our planned future capital requirements
and accelerate our need for additional financing. These factors, many of which are outside our control, include the following:



| |  |  | unanticipated costs in our research and development programs, as well as the magnitude of these programs;
| | - |  | ---------------------------------------------------------------------------------------------------------



| |  |  | the cost of additional facility requirements;
| | - |  | ---------------------------------------------



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| |  |  | the unplanned or early termination of any of our collaborative arrangements or decreases in funding of our portion of the research and development programs despite
continuation of the collaboration agreement;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the timing, receipt and amount of research funding and contingent cash payments, license, royalty and other payments, if any, from collaborators;
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the timing, payment and amount of research funding and contingent cash payments, license, royalty and other payments due to licensors of patent rights and
technology used to make, use and sell our product candidates;
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the timing, receipt and amount of sales revenues and/or royalties, if any, that we may receive in the future if any of our product candidates are successfully
developed and commercialized; and
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the costs of preparing, filing, prosecuting, maintaining and enforcing patent claims and other patent-related costs, including litigation costs and technology
license fees.
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------

We expect to seek additional funding in the near term through public or private financings of debt or
equity as well as from additional strategic collaborators. The market for biotechnology stocks in general, and the market for our common stock in particular, is highly volatile. Due to this and various other factors, including 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. If we fail to obtain such additional financing on a timely basis, our ability to continue all of our
research and development activities will be adversely affected.

If we raise additional funds by issuing equity securities, dilution to our
stockholders will result. In addition, the terms of such a financing may adversely affect other rights of our stockholders. We also could elect to seek funds through arrangements with collaborators or others that may require us to relinquish rights
to certain technologies, product candidates or products.

We may face fluctuations in our operating results from period to period, which may result in a
drop 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;
| | - |  | -------------------------------------------------------



| |  |  | the number of product candidates we have and their progress in achieving pre-clinical and clinical development objectives;
| | - |  | --------------------------------------------------------------------------------------------------------------------------



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



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



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



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



| |  |  | changes in accounting policies or principles; and
| | - |  | -------------------------------------------------



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

Except for our systemically administered Hedgehog antagonist program, which is in a Phase I clinical trial, all of our programs are in various stages of
preclinical drug development. Accordingly, our revenues from the sales of any products resulting from our research and development efforts may not occur for several years, if at all. While we may receive contingent cash payments upon the achievement
of certain objectives defined within our collaboration agreements, the timing of such payments is uncertain. In addition, the amount of these payments and the methodology that we would record such payments to revenue vary for each of our
collaborator agreements. As a result, we may experience fluctuations in our operating results from quarter to quarter and continue to generate losses. Quarterly comparisons of our financial results may not necessarily be meaningful,



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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.

We determined that certain accounting errors in our financial statements had a material impact on our previously reported financial information. As a result of this
determination, we restated our financial results for 2003, 2004 and for the quarters ended March 31, 2005, June 30, 2005 and September 30, 2005. The restatement could subject us to securities litigation.

As discussed in Note 2 of the notes to our consolidated financial statements included in our Annual Report on Form 10-K for the year ended
December 31, 2005, in March 2006, we restated our financial results for 2003, 2004 and for the quarters ended March 31, 2005, June 30, 2005, and September 30, 2005. The restatement relates primarily to accounting errors in
prior periods with respect to our revenue recognition accounting for $7,509,000 in license and maintenance fee payments paid by Genentech as part of our June 2003 Hedgehog antagonist collaboration with Genentech. We had been recognizing revenue in
connection with the $7,509,000 in payments over an eight-year period based on our estimate that our participation on the steering committees for the collaboration would become inconsequential after the first product was approved in each of the two
programs covered under this collaboration, and would therefore no longer represent a performance obligation. Accordingly, from fiscal year 2003 through the third quarter of 2005, we had recognized $2,239,000 in license fee revenue related to these
payments. Following discussions with the SEC, we determined we should not have recognized any of this revenue in 2003, 2004 or 2005. Instead, we have deferred the $7,509,000 in payments and will recognize this amount as revenue only when we can
reasonably estimate when our contractual steering committee obligations will cease or after we no longer have contractual steering committee obligations under this agreement with Genentech. The contractual term of our steering committee obligations
extends for as long as Hedgehog antagonist products subject to this collaboration are being developed or commercialized by either of the parties. Accordingly, the contractual term of our steering committee obligations is indefinite and we expect
that we will not record any revenue related to these payments for at least several years.

Securities class action litigation has often
been brought in connection with restatements of financial statements. Defending against such potential litigation relating to a restatement of our financial statements would be expensive and would require significant attention and resources of our
management. Moreover, our insurance to cover our obligations with respect to the ultimate resolution of any such litigation may be inadequate. As a result of these factors, any such potential litigation could have a material adverse effect on our
business, results of operations and financial condition.

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 and related disclosure. Such estimates and judgments include the carrying value of our property, equipment and intangible assets, revenue recognition and the value of certain liabilities. 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 example, during the second quarter of 2007, Procter & Gamble terminated our collaboration agreement, which was focused on seeking to develop
topically-applied Hedgehog agonist compounds for hair growth regulation. We had originally estimated that our performance period under this collaboration was six years and we were recognizing the payments received under this collaboration over this
six-year period, ending September 2011. The termination of this collaboration agreement caused us to change our estimated performance



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period to coincide with the termination date of November 2007. Accordingly, recognition of deferred revenue related to our Procter & Gamble
collaboration will be accelerated and recognized based on the updated performance period.

In addition, as discussed above in March 2006 we
determined that certain accounting errors in our financial statements had a material impact on our previously reported financial information. As a result of this determination, we restated our financial results for 2003, 2004 and for the quarters
ended March 31, 2005, June 30, 2005 and September 30, 2005. The restatement could cause our stock price to decline and could subject us to securities litigation. 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 and in our annual report on Form 10-K for the year ended December 31, 2006, which was filed with the SEC on March 2, 2007.

RISKS RELATING TO OUR COLLABORATIONS

We are dependent on collaborators for the
development and commercialization of many of our key product candidates and for substantially all of our revenue. If any of these collaborators terminate our agreements, of if they fail or delay in developing or commercializing our product
candidates, our anticipated product pipeline and operating results would suffer.

The success of our strategy for development and
commercialization of certain licensed product candidates depends upon our ability to form and maintain productive and successful strategic collaborations. During the six-month period ended June 30, 2007 and the year ended December 31,
2006, $3.6 million and $13.2 million, or 100% and 79%, respectively, of our gross revenue was derived from licensing, research and development and substantive milestone payments we received from collaborators. We currently have two collaborations
with Genentech as well as a collaboration with Wyeth Pharmaceuticals, and we are seeking to enter into additional collaborations in the future, including a potential collaboration related to the development of CUDC-101, the first development
candidate from our Targeted Cancer Drug Development Platform. To date, our collaborations with Genentech and Wyeth have involved substantial development effort by us, a significant amount of which has been funded by our respective collaborative
partner. Our research effort concluded for both of our Genentech programs and the number of researchers being funded by Wyeth declined from eight to five. Accordingly, the third-party funding of our development effort has been
significantly reduced or eliminated. As a result of the decreased need for our internal development efforts and the related reduction in third-party funding, we have been required to terminate the employment of or reassign personnel working on
such programs to other programs, particularly our programs under our Targeted Cancer Drug Development Platform. We may not be successful in reassigning personnel and we do not have adequate funding on other programs to support such personnel.
Moreover, our existing and any future collaborations may not be scientifically or commercially successful.

The risks that we face in
connection with these collaborations include the following:



| |  |  | Each of our collaborators has significant discretion in determining the efforts and resources that it will apply to the collaboration. The timing and amount of any
cash payments related to future royalties, research support and the achievement of development objectives that we may receive under such collaborative arrangements will depend on, among other things, each collaborators efforts and allocation
of resources.
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | All of our strategic collaboration agreements are for fixed terms and are subject to termination under various circumstances, including in some cases, on short
notice without cause. If any collaborator were to terminate an agreement, we may not have the funds or capability to independently undertake product development, manufacturing and commercialization, which could result in a discontinuation of such
program.
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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| |  |  | Our strategic collaboration agreements permit our collaborators wide discretion in terms of deciding which product candidates to advance to development candidate
selection and through the clinical trial process. It is possible for product candidates to be rejected by a collaborator, at any point in the clinical trial process, without triggering a termination of the collaboration agreement with
us. In the event of such decisions, we may be adversely affected due to our inability to progress product candidates ourselves.
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Our collaborators may develop and commercialize, either alone or with others, products and services that are similar to or competitive with the products and
services that are the subject of the collaboration with us.
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Our collaborators may change the focus of their development and commercialization efforts or pursue higher-priority programs. The ability of certain of our product
candidates to be successfully commercialized could be limited if our collaborators decrease or fail to increase spending related to such product candidates.
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

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

As an integral part of our ongoing research and development efforts, we periodically review opportunities to establish new strategic collaborations for
the development and commercialization of products in our development pipeline. For example, we are currently seeking a corporate collaboration for CUDC-101, which is the first development candidate selected from our propriety Targeted Cancer Drug
Development Platform. We face significant competition in seeking appropriate collaborators and the negotiation process is time-consuming and complex. We may not be successful in our efforts to establish a collaboration for CUDC-101 or any additional
strategic collaborations or other alternative arrangements. Our research and development pipeline may be insufficient or our programs stages of development may be deemed to be at too early of a stage of development for collaborative effort.
Even if we are successful in our efforts to establish new collaborations, the terms that we agree upon may not be favorable to us. Finally, any such strategic alliances or other arrangements may not result in the successful development and
commercialization of products and associated revenue.

RISKS RELATED TO OUR BUSINESS, INDUSTRY, STRATEGY AND OPERATIONS

We and our collaborators may not achieve our projected research and development goals in the time frames we announce and expect, 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 and clinical trials, anticipated regulatory approval dates and other developments and milestones under our collaboration agreements. For example, we have
estimated that we will seek to file an IND to commence clinical trials of CUDC-101 in the first quarter of 2008 and select a second development candidate from our Targeted Cancer Drug Platform in late 2007. The actual timing of these events can vary
dramatically due to a number of factors such as delays or failures in our or our collaborators preclinical studies or clinical trials, the amount of time, effort and resources committed to our programs by us or our collaborators and the
uncertainties inherent in the regulatory approval process. There can be no assurance that our or our collaborators preclinical studies and clinical trials will advance or be completed in the time frames we announce or expect, that we or our
collaborators will make regulatory submissions or receive regulatory approvals as planned or that we or our 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 our 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.



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

Our product 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 increasingly competitive. We are developing
Hedgehog-based therapies under our collaborations with Genentech in the field of cancer and with Wyeth in the field of neurology . Competitors may discover, characterize and develop Hedgehog-based drug candidates before we do.

In addition, our multi-target inhibitors being developed under our Targeted Cancer Drug Development Platform, which are focused primarily on clinically
validated cancer targets, face significant competition from marketed drugs and drugs under development that seek to inhibit the same targets as our drug candidates.

Many of our competitors have substantially greater capital resources, research and development staffs and facilities than we have. Efforts by other biotechnology, 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 commercialization 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, which render our products non-competitive or obsolete.

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.

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.

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, 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 product candidates. Although we do not currently
commercialize any products, claims could be made against us based upon the use of our drug candidates in clinical trials. Product liability claims would require us to spend significant time, money and other resources to defend such claims and could
ultimately lead to our having to pay a significant damage award. Product liability insurance is expensive to procure for biopharmaceutical companies such as ours. Although we would maintain product liability insurance coverage for



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any future clinical trials of our products under proprietary development, it is possible that we will not be able to obtain this product liability insurance
on acceptable terms, if at all, and that our product liability insurance coverage would not prove to be adequate to protect us from all potential claims. We currently do not carry any product liability insurance since we are not currently running
any proprietary clinical trials. Our only ongoing clinical trial is being run by Genentech, a collaborator.

If we are not able to attract and retain
key management and scientific personnel and advisors, we may not successfully develop our product 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, and
Changgeng Qian, Ph.D., M.D., our Vice President, Discovery and Preclinical 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. We are not aware of any present intention of any of these individuals to leave our company. 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 expect 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 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.
| | - |  | -------------------------



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RISKS RELATING TO OUR INTELLECTUAL PROPERTY

If we or any of our licensees or assignees breach any of the agreements under which we license or transfer 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 and 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 fails to comply with these requirements, 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 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 biotechnology companies, including ours, are generally uncertain and involve complex legal, scientific and
factual questions. The standards that the United States Patent and Trademark Office uses to grant patents, and the standards that courts use to interpret patents, are not always applied predictably or uniformly and can change, particularly as new
technologies develop. Consequently, the level of protection, if any, that will be 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 sufficiently broad 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 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 product candidates. In some cases, these patents may
be owned or controlled by third-party competitors and may impair our ability to exploit our technology. As a result, we or our collaborative partners may be required to obtain licenses under third-party patents to develop and commercialize some of
our product candidates. If we are unable to secure licenses to such patented technology on acceptable terms, we or our collaborative partners will not be able to develop and commercialize the affected product 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
stop our development and commercialization efforts.

There have been substantial litigation and other proceedings regarding patent and
other intellectual property rights in the pharmaceutical and biotechnology industries. We may become a party to patent litigation or other proceedings regarding intellectual property rights.



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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;
| | - |  | -------------------------------------------------------------------------------------------------



| |  |  | initiation of litigation or other proceedings against third parties to seek to invalidate the patents held by these third parties or to obtain a judgment that our
product 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
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | initiation of litigation by third parties claiming that our processes or product candidates or the intended use of our product 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 our collaborative partners may be enjoined from manufacturing or selling our products and services 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 our collaborative partners 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. Patent litigation and other proceedings may also absorb significant management time and expense.

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 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.



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RISKS RELATING TO PRECLINICAL, CLINICAL AND REGULATORY MATTERS

If preclinical studies and clinical trials of our product candidates are not successful, and we or our collaborators are not able to obtain the necessary regulatory
approvals, then we and our collaborators will not be able to commercialize those product candidates on a timely basis, if at all, which would adversely affect our future profitability and success.

In order to obtain regulatory approval for the commercial sale of our product candidates, we and our 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 product candidates are safe and effective. Development, including preclinical and clinical testing, is a long, expensive
and uncertain process. Accordingly, preclinical testing and clinical trials of our product candidates under development may not be successful. We and our collaborators could experience delays or failures in preclinical or clinical trials of any of
our product candidates for a number of reasons. For example:



| |  |  | preclinical studies or clinical trials may produce negative, inconsistent or inconclusive results, and we or our collaborators may decide, or regulators may require
us, to conduct additional preclinical studies or clinical trials or terminate testing for a particular product 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 product candidate used in any preclinical study or clinical trial;
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the timing and completion of clinical trials of our product candidates depend on, among other factors, the number of patients we will be required to enroll 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 targeted disorders 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 or regulators, including the FDA, or our collaborators may hold, suspend or terminate our clinical research or the clinical trials of
our product 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 our collaborators and subcontractors, may not employ, in any capacity, persons who have been debarred under the FDAs Application Integrity
Policy. Employment of such a debarred person may result in delays in FDAs review or approval of our products, or the rejection of data developed with the involvement of such person(s).
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

If the preclinical studies and/or clinical trials for any product candidates that we and our 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.

We have very limited experience in conducting clinical trials. We are currently recruiting clinical/regulatory
management but we expect to rely primarily on collaborative partners for our programs under collaboration and, to a lesser extent, consultants and contract research organizations for our internal programs for the performance and management of
clinical trials of our product candidates. If such third parties fail to perform then we will not be able to successfully develop and commercialize product candidates and grow our business.

We have limited experience in conducting clinical trials.We expect to rely to varying degrees on third parties to conduct our clinical trials and
provide services in connection with such clinical trials. For example, we



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have granted development and commercialization rights under our existing agreements with Genentech and Wyeth. In most instances, such collaboration partners
are fully responsible for conducting clinical trials of product candidates. We have also reserved limited rights to further develop and commercialize products that are subject to current collaborations. In these instances and for product candidates
associated with new programs, we will be responsible for clinical trials. While we expect that we will add clinical/regulatory employees, we expect that hiring such employees will be difficult since competition for skilled clinical and regulatory
employees is intense. In the near term, we are likely to rely primarily on third parties such as consultants, contract research organizations and other similar entities to completed IND-enabling preclinical studies, create and file INDs,
enroll qualified patients, 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 may not conduct our clinical trials in accordance with regulatory requirements or the trial design. If any such events were to occur, efforts to obtain regulatory approvals for and commercialize
our drug candidates may be delayed.

In addition, for those product candidates where we are responsible for clinical trials, we must ensure
that each such clinical trial is conducted in accordance with the general investigational plan and protocols for the trial. The FDA requires us to comply with certain standards, referred to as good clinical practices, 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, we may not be able to use the data and reported results from the
trial. If this were to occur, our efforts to obtain regulatory approvals for and commercialize our product candidates may be delayed.

The development
process necessary to obtain regulatory approval is lengthy, complex and expensive. 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 collaborative partners will be required to obtain regulatory approval in order to successfully
advance our product candidates through the clinic and prior to marketing and selling such products.

The process of obtaining FDA and other
required regulatory approvals is expensive. The time required for FDA and other approvals is uncertain and typically takes a number of years, depending on the complexity and novelty of the product. The process of obtaining FDA and other required
regulatory approvals for many of our products under development is further complicated because some of these products use non-traditional or novel materials in non-traditional or novel ways, and the regulatory officials have little precedent to
follow. With respect to internal programs to date, 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 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, or our collaborative partners, also are subject to numerous foreign regulatory requirements governing the manufacturing and marketing of our
potential future products outside of the United States. The approval 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 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, or our collaborative partners, may be slow to adapt or may not be able to adapt to these changes or new requirements.



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As a result of these factors, we or our collaborators may not successfully begin or complete clinical
trials and/or obtain regulatory approval to market and sell our product candidates in the time periods estimated, if at all. Moreover, if we or our 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 our collaborators develop will be subject to ongoing regulatory oversight, which may affect the successful commercialization of such products.

Even if we or our collaborators obtain regulatory approval of a product candidate, the approval may be subject to limitations on the 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 and other regulatory agencies. The subsequent discovery of previously unknown problems with the product, or with the manufacturer or facility, may result in restrictions on the product or manufacturer, including
withdrawal of the product from the market.

If there is a failure to comply with applicable regulatory requirements, we or our collaborator
may be subject to 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.

We and our collaborators are subject to governmental regulations other than those imposed by the FDA. We and our
collaborators may not be able to comply with these regulations, which could subject us, or such collaborators, to penalties and otherwise result in the limitation of our or such collaborators operations.

In addition to regulations imposed by the FDA, we and our collaborators are 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 applications. 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.

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.

RISKS RELATING TO MANUFACTURING AND SALES

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

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



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and in a timely manner. The manufacture of our product 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 products may make them prohibitively expensive. If supplies of any of our product
candidates or related materials become unavailable or are not delivered on a timely basis or at all, or are contaminated or otherwise lost, certain preclinical studies and/or clinical trials by us and our collaborators could be seriously delayed.
This is due to the fact that such materials are time-consuming to manufacture and cannot be readily obtained from third-party sources.

To
the extent that we or our 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, our 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 product candidates, delays, suspension or withdrawal of approvals, seizures or recalls of product 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 our collaborators may not be able to initiate or continue certain preclinical and/or clinical trials of products that are under development;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------



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



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

We have no sales or marketing experience and, as such, will depend significantly on third parties who may not successfully sell our products.

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 Wyeth, we have granted our collaborators 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.



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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 coverage, pricing, third-party reimbursements and healthcare reform, all
of which could affect our future profitability.

Our ability to collect significant royalties from our products may depend on our
ability, and the ability of our collaboration partners or customers, to obtain adequate levels of coverage for our products and reimbursement 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 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 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. If third-party payers deny coverage or offer inadequate levels of reimbursement, we or our collaborators may not be able to
market our products effectively. We also face the risk that we will have to offer our products at prices lower than anticipated as a result of the current trend in the United States towards managed healthcare through health maintenance
organizations. Currently, third-party payers are increasingly challenging the prices charged for medical products and services. Prices could be driven down by health maintenance organizations that control or significantly influence purchases of
healthcare services and products. Existing U.S. laws, such as the Medicare Prescription Drug and Modernization Act of 2003, or future legislation to reform healthcare or reduce government insurance programs could also adversely affect prices of our
approved products, if any. The cost-containment measures that healthcare providers are instituting and the results of potential healthcare reforms may prevent us from maintaining prices for our products 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 products are marketed outside of the United States, foreign government pricing controls and other regulations may
prevent us from maintaining prices for our products that are sufficient for us to realize profits and may otherwise significantly harm our business, financial condition and operating results.



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RISKS RELATED TO OUR COMMON STOCK

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 has traded as high as $6.59 and as low as $0.91 per share for the period January 1,
2004 through June 30, 2007. The stock market, particularly in recent years, has experienced significant volatility with respect to pharmaceutical- and biotechnology-based 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 our collaborators;
| | - |  | ----------------------------------------------------------------------------------------



| |  |  | any intellectual property 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 market conditions.
| | - |  | --------------------------

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.

Substantially all of our outstanding common stock may be sold into the market at any time. This could cause the market price of our common
stock to drop significantly.

As of June 30, 2007, we had outstanding approximately 49.5 million shares of common stock. 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.



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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 bid
price of at least $1.00 per share for our common stock. We currently comply with the minimum bid requirement. However, our stock price has fallen below $1.00 in the past year and could fall below $1.00 in the future. 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.

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 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 4. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS.

At our annual meeting of stockholders held on
June 6, 2007, the following matters were acted upon by our stockholders:



| | 1. | The election of two Class II directors for the ensuing three years; and
| | -- | -----------------------------------------------------------------------



| | 2. | The ratification of our appointment of PricewaterhouseCoopers LLP as our independent registered public accounting firm for the current fiscal year.
| | -- | ---------------------------------------------------------------------------------------------------------------------------------------------------



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The number of shares of common stock present or represented by proxy and entitled to vote at the annual
meeting was 43,875,064. The results of the votes on each of the matters presented to the stockholders at our annual meeting are set forth below:



|                                           |  |            |  |                |  |              |  |             |  |                
|------------------------------------------ |  | ---------- |  | -------------- |  | ------------ |  | ----------- |  | ---------------
|Matter                                     |  | Votes for  |  | Votes Withheld |  | VotesAgainst |  | Abstentions |  | BrokerNon-Votes
|Election of Directors:                     |  |            |  |                |  |              |  |             |  |                
|Joseph M. Davie                            |  | 43,223,560 |  | 651,504        |  |             |  |            |  |               
|Daniel R. Passeri                          |  | 43,220,533 |  | 654,531        |  |             |  |            |  |               
|Ratification of PricewaterhouseCoopers LLP |  | 43,426,575 |  |               |  | 366,055      |  | 82,434      |  |               

Our other directors, whose terms of office as directors continued after the annual meeting, are
Susan B. Bayh, Martyn D. Greenacre, Kenneth I. Kaitin, James R. McNab, Jr. and James R. Tobin.

Item 6. EXHIBITS

See exhibit index.



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SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has
duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.



|                     |  |  |  |             |  |                        |  |                                                    
|-------------------- |  |  |  | ----------- |  | ---------------------- |  | ---------------------------------------------------
|                     |  |  |  | CURIS, INC.
|                     |  |  | 
|Dated: July 31, 2007 |  |  |  | By:         |  | /s/    MICHAEL P. GRAY
|                     |  |  |  |             |  |                        |  | Michael P. Gray                                    
|                     |  |  |  |             |  |                        |  | Chief Operating Officer and Chief Financial Officer
|                     |  |  |  |             |  |                        |  | (Principal Financial and Accounting Officer)       



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EXHIBIT INDEX



|              |  |                                                                                                                       
|------------- |  | ----------------------------------------------------------------------------------------------------------------------
|ExhibitNumber |  | Description                                                                                                           
|10.1          |  | Agreement and General Release with Mary Elizabeth Potthoff                                                            
|              | 
|31.1          |  | Certification of the Chief Executive Officer pursuant to Rule 13a-14(a) of the Exchange Act                           
|              | 
|31.2          |  | Certification of the Chief Financial Officer pursuant to Rule 13a-14(a) of the Exchange Act                           
|              | 
|32.1          |  | Certification of the Chief Executive Officer pursuant to Rule 13a-14(b) of the Exchange Act and 18 U.S.C. Section 1350
|              | 
|32.2          |  | Certification of the Chief Financial Officer pursuant to Rule 13a-14(b) of the Exchange Act and 18 U.S.C. Section 1350