Document:

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                                                                EXHIBIT NO. 10.4

          CONFIDENTIAL MATERIALS OMITTED AND FILED SEPARATELY WITH THE
         SECURITIES AND EXCHANGE COMMISSION. ASTERISKS DENOTE OMISSIONS.

                                LICENSE AGREEMENT

                                 BY AND BETWEEN

                                   PFIZER INC.

                                       AND

                          EYETECH PHARMACEUTICALS, INC.

                          Dated as of December 17, 2002

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                                Table of Contents

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ARTICLE 1         DEFINITIONS......................................................................    1

ARTICLE 2         LICENSES.........................................................................   14

   2.1   Eyetech Grants............................................................................   14
   2.2   License Grant to Eyetech..................................................................   16
   2.3   Sublicensing..............................................................................   16

ARTICLE 3         BASE PAYMENTS AND PERFORMANCE MILESTONES.........................................   17

   3.1   Base Payments.............................................................................   17
   3.2   Performance Milestones....................................................................   18

ARTICLE 4         REVENUE SHARE....................................................................   21

   4.1   Revenue Share.............................................................................   21
   4.2   Survival of Licenses After Expiration of Royalty Term and After Expiration of
         Co-Promotion Term.........................................................................   23
   4.3   Third Party Royalties.....................................................................   23

ARTICLE 5         ACCOUNTING AND PROCEDURES FOR PAYMENTS...........................................   26

   5.1   Sales Subject to Royalty Obligations......................................................   26
   5.2   Royalty Payments; Royalty Reports; Pfizer Operating Profit................................   26
   5.3   Currency Exchange; Late Payments..........................................................   27
   5.4   Withholding Taxes.........................................................................   28
   5.5   Audits....................................................................................   28
   5.6   Blocked Payments..........................................................................   29

ARTICLE 6         TECHNICAL AND OTHER INFORMATION..................................................   29

   6.1   Disclosure of Technical Information.......................................................   29
   6.2   Confidentiality...........................................................................   30
   6.3   Publicity Related to this Agreement.......................................................   30
   6.4   Applicability of Obligations to Affiliates, Employees, Directors, Agents,
         Independent Contractors and Consultants...................................................   31

ARTICLE 7         PATENTS..........................................................................   31

   7.1   Third Party License Agreements............................................................   31
   7.2   Disclosure of Patent Applications and Proceedings.........................................   32
   7.3   Prosecution and Maintenance; Costs........................................................   33
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                                Table of Contents

                                   (continued)

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   7.4   Third Party Infringement Actions..........................................................   34
   7.5   Patent Term Extensions....................................................................   36
   7.6   US Territory Intellectual Property Infringement Claims....................................   37
   7.7   ROW Territory Intellectual Property Infringement Claims...................................   37
   7.8   Ownership and Prosecution of Patent Rights Included in the Collaboration
         Intellectual Property.....................................................................   37

ARTICLE 8         REPRESENTATIONS, WARRANTIES AND COVENANTS........................................   38

   8.1   Eyetech Representations and Warranties....................................................   39
   8.2   Pfizer Representations and Warranties.....................................................   44
   8.3   Eyetech Covenants.........................................................................   45
   8.4   No Consequential or Punitive Damages......................................................   46

ARTICLE 9         TERM.............................................................................   47

ARTICLE 10        TERMINATION......................................................................   47

   10.1  Termination for Convenience...............................................................   47
   10.2  Termination for Breach....................................................................   48
   10.3  Breach of Non-Competition Obligations.....................................................   50
   10.4  Effects of Termination....................................................................   50
   10.5  Non-Competition...........................................................................   52
   10.6  Acquisitions Involving Competing Products.................................................   54
   10.7  Competing Products in the EU..............................................................   55

ARTICLE 11        DISPUTE RESOLUTION...............................................................   55

   11.1  Arbitration...............................................................................   55
   11.2  No Limitation.............................................................................   57

ARTICLE 12        MISCELLANEOUS....................................................................   57

   12.1  Force Majeure.............................................................................   57
   12.2  Assignment................................................................................   57
   12.3  Governing Law.............................................................................   57
   12.4  Jurisdiction..............................................................................   58
   12.5  Notices...................................................................................   58
   12.6  Entire Agreements; Amendments.............................................................   59
   12.7  Severability..............................................................................   60
   12.8  Waivers...................................................................................   60
   12.9  Binding Effect............................................................................   60
   12.10 Further Assurances........................................................................   60
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                                Table of Contents

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   12.11 Third Party Beneficiaries.................................................................   61
   12.12 Performance by Subsidiaries and Affiliates................................................   61
   12.13 Counterparts..............................................................................   61
   12.14 Headings..................................................................................   61
   12.15 Offset....................................................................................   62
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EXHIBIT 1.8      -   COMPOUND
EXHIBIT 1.18     -   EYETECH PATENT RIGHTS
EXHIBIT 8.1(f)   -   CERTAIN INTELLECTUAL PROPERTY MATTERS
EXHIBIT 8.1(i)   -   FUNDING SOURCES
EXHIBIT 8.1(j)   -   STUDIES

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                                LICENSE AGREEMENT

         THIS LICENSE AGREEMENT (this "Agreement") dated as of December 17, 2002
(the "Execution Date") between Pfizer Inc., a corporation organized under the
laws of the state of Delaware, 235 East 42nd Street, New York, New York 10017
("Pfizer"), and Eyetech Pharmaceuticals, Inc. ("Eyetech"), a corporation
organized under the laws of the state of Delaware, 500 Seventh Avenue, 18th
Floor, New York, New York 10018.

         WHEREAS, Eyetech owns or licenses or may acquire rights under certain
patents and patent applications, licenses to patents and patent applications,
know-how, trade secrets and scientific and technical information relating to the
aptamer known as Macugen;

         WHEREAS, the Parties desire to co-promote products containing or based
on the Macugen aptamer in the US Territory (as defined below); and

         WHEREAS, Pfizer desires to acquire from Eyetech exclusive rights to
develop and commercialize products containing or based on the Macugen aptamer in
the ROW Territory (as defined below).

         NOW, THEREFORE, the Parties agree as follows:

                                    ARTICLE 1

                                   DEFINITIONS

         Any capitalized terms used herein that are not expressly defined in
this Agreement shall have the meanings set forth in the Collaboration Agreement.
For purposes of this Agreement, the following definitions shall be applicable:

         1.1      "Affiliate" means any Person directly or indirectly controlled
by, controlling or under common control with, a Party, but only for so long as
such control shall continue. For purposes of this definition, "control"
(including, with correlative meanings, "controlled by",

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"controlling" and "under common control with") means, with respect to a Person,
possession, direct or indirect, of (a) the power to direct or cause direction of
the management and policies of such Person (whether through ownership of
securities or partnership or other ownership interests, by contract or
otherwise), or (b) at least 50% of the voting securities (whether directly or
pursuant to any option, warrant or other similar arrangement) or other
comparable equity interests. For the avoidance of doubt, neither of the Parties
shall be deemed to be an "Affiliate" of the other.

         1.2      "AMD Product" means a Product developed for use in the
treatment of age-related macular degeneration.

         1.3      "Approval" means receipt from the applicable Regulatory
Authority of approval to market a drug in one or more countries.

         1.4      "Bankruptcy Code" means 11 U.S.C Sections 101-1330, as
amended.

         1.5      "Cash Flow" means, with respect to any Person (or any
combination of two or more Persons) for any fiscal period, such Person's (or
such combination's) EBITDA for such fiscal period, less any milestone payment
amounts received by such Person (or combination) pursuant to Section 3.1(a) of
this Agreement included in such EBITDA and less any capital expenditures paid by
such Person (or such combination) during such fiscal period.

         1.6      "Collaboration Agreement" means the Collaboration Agreement
dated as of the date hereof between the Parties.

         1.7      "Collaboration Intellectual Property" means Patent Rights and
Technical Information developed or acquired by either Party, or jointly by the
Parties, or by their respective Affiliates, in the course of the Parties' and
their respective Affiliates' activities pursuant to this Agreement or the
Collaboration Agreement.

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         1.8      "Compound" means the anti-VEGF aptamer known as Macugen
(EYE001), as more specifically described in Exhibit 1.8, including without
limitation metabolites or prodrugs thereof, and any hydrates, conjugates, salts,
esters, isomers, polymorphs or analogues of any of the foregoing.

         1.9      "Control" or "Controlled" means, with respect to any
intellectual property right, the possession (whether by ownership or license) by
a Party (or by any Subsidiary of a Party) of the ability to grant to the other
Party a license under such right without violating the terms of any agreement
with any third party.

         1.10     "Co-Promote" shall have the meaning ascribed to it in the
Collaboration Agreement.

         1.11     "DME Product" means a Product developed for use in the
treatment of diabetic macular edema.

         1.12     "EBITDA" means, with respect to any Person (or combination of
two or more Persons) for any fiscal period, an amount equal to the sum of (a)
the Net Income of such Person (or such combination) for such fiscal period plus
(b) depreciation, amortization, Interest Expense and taxes deducted in
calculating such Net Income, plus (c) any extraordinary or nonrecurring losses
deducted in calculating such Net Income, minus (d) any extraordinary or
nonrecurring gains included in calculating such Net Income, all as determined in
accordance with GAAP.

         1.13     "Effective Date" means the HSR Clearance Date.

         1.14     "EMEA" means The European Agency for the Evaluation of
Medicinal Products.

         1.15     "Escrow Agent" means the third party financial institution
party to, and serving as escrow agent in accordance with, the Escrow Agreement.

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         1.16     "Escrow Agreement" means the escrow agreement entered into by
and among the Parties, and a third party financial institution in accordance
with Section 3.1(c).

         1.17     "EU" means the European Union, as it may be expanded from time
to time.

         1.18     "Eyetech Patent Rights" means all Patent Rights, now or
hereafter during the Term, Controlled by Eyetech or its Subsidiaries relating
to, or useful in connection with, the manufacture, use or sale of the Compound
or the Products, including, without limitation, the patents and patent
applications set forth on Exhibit 1.18, but excluding patents and patent
applications claiming drug delivery devices, methods or technology licensed by
any third party to Eyetech under any license agreement other than the Gilead
License, the Shearwater License or the Isis License.

         1.19     "Eyetech Technical Information" means all scientific or
technical information and related know-how and trade secrets, now or hereafter
during the term of this Agreement, Controlled by Eyetech or its Subsidiaries
relating to the Compound or the Products, including but not limited to: (a)
medical, clinical, toxicological or other scientific data and (b) processes and
analytical methodology useful in the development, testing, analysis, manufacture
or packaging of the Compound or the Products (excluding drug delivery know-how
and technology licensed by any third party to Eyetech under any license
agreement other than the Gilead License, the Shearwater License or the Isis
License).

         1.20     "Field" means the prevention, treatment or control of all
ophthalmic diseases or conditions.

         1.21     "Fixed Charge Coverage Ratio" means the ratio of:

                  (a)      the aggregate amount of EBITDA for the twelve (12)
month period ended on the last day of the most recently completed fiscal quarter
referred to in clause (a)(i), (b)(i) or

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(c)(i), as applicable, of the definition of [**] (such four full fiscal quarter
period being referred to herein as the "Prior Quarters") for which financial
statements contained in an SEC Report have been filed with the SEC or, where
Eyetech or any Person acquiring control of or merging with Eyetech in connection
with a Change in Control is not required under applicable law to file SEC
Reports, for which financial statements have been delivered to Pfizer, to

                  (b)      the aggregate amount of Fixed Charges of such Person
for the Prior Quarters.

In addition to and without limitation of the foregoing, for purposes of this
Section 1.21, in the case of a Change in Control of Eyetech, "EBITDA" and "Fixed
Charges" shall be calculated as if such Change in Control occurred during the
most recently completed Prior Quarter after giving effect on a pro forma basis
for the period of such calculation to, without duplication, Interest Expense
with respect to Indebtedness and transaction fees incurred with respect to the
transactions related to such Change in Control of Eyetech and any Person that
acquires control of Eyetech or with whom Eyetech merges in such Change in
Control (and the application of the net proceeds thereof) during the period
commencing on the first day of the Prior Quarters to and including the last day
of the Prior Quarters (the "Reference Period"), all as if such incurrence (and
application) and expense occurred on the first day of the Reference Period.
Furthermore, if interest on any Indebtedness incurred with respect to the
transactions related to such Change in Control may optionally be determined at
an interest rate based upon a factor of a prime, LIBOR, or similar rate, a
eurocurrency interbank offered rate, or other rates, then the interest rate in
effect on the date of such transactions will be deemed to have been the interest
rate in effect on such Indebtedness during the Reference Period.

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         1.22     "Fixed Charges" means, with respect to any Person (or any
combination of two or more Persons) for any fiscal period, such Person's (or
such combination's) (a) Interest Expenses and (b) dividends paid by such Person
(or such combination) during such fiscal period, all as determined in accordance
with GAAP.

         1.23     "Generic Competition" shall exist during a given calendar
quarter with respect to a Product in any country in the ROW Territory if, during
such calendar quarter, one or more Generic Products shall be commercially
available in such country and shall have, in the aggregate, a [**] percent
([**]%) or more market share of the aggregate of (Products and Generic Products)
(based on data provided by IMS International, or if such data is not available,
such other reliable data source as reasonably determined by Pfizer and agreed by
Eyetech (such agreement not to be unreasonably withheld)) as measured by unit
sales. In the event IMS International data (or such other agreed data source) is
not sufficient to determine the percentage market share for each country in the
EU, the percent market share for the EU countries for which data is not
available will be deemed to be the average percent market share for those EU
countries in which the data is available.

         1.24     "Generic Products" mean, with respect to a Product
commercialized by Pfizer in a country, products (other than Products
commercialized by Pfizer pursuant to this Agreement) that (a) contain the same
active chemical entity(ies) as contained in such Product and (b) have the same
therapeutic benefit as such Product.

         1.25     "Gilead License" means the Licensing Agreement dated as of
March 30, 2000, by and among Eyetech, Gilead Sciences, Inc. ("Gilead") and
NeXstar Pharmaceuticals, Inc., as amended from time to time.

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         1.26     "Indebtedness" means (a) indebtedness for borrowed money; (b)
the deferred price of property or services (which shall not include ordinary
course of business payables); (c) obligations evidenced by notes, bonds,
debentures, mortgages or similar instruments; (d) capital or finance lease
obligations or hire purchase arrangements; (e) receivables sold or discounted
(other than on a non-recourse basis); (f) any amount raised under any other
transaction (including any forward sale or purchase agreement) having the
commercial effect of a borrowing; and (g) the amount of any balance sheet
liability in respect of any guarantee or indemnity for any of the items referred
to in paragraphs (a) to (f) above.

         1.27     "Interest Expense" means, for any period, without duplication,
the sum of (a) the interest expense of such Person for such period as determined
on a consolidated basis in accordance with GAAP, including, without limitation,
(i) any amortization or accretion of debt discount, (ii) the net cost under any
hedge instrument, (iii) the interest portion of any deferred payment obligation,
and (iv) all accrued interest; (b) the interest component of capitalized lease
obligations determined on a consolidated basis in accordance with GAAP; and (c)
that portion of all operating lease rentals representative of an interest factor
(which shall be deemed to be equal to 1/3 of all operating lease rentals).

         1.28     "Isis License" means the License Agreement dated as of
December 31, 2001, by and between Eyetech and Isis Pharmaceuticals, Inc.
("Isis"), as amended from time to time.

         1.29     "Law" or "Laws" means all laws, statutes, rules, Codes,
regulations, orders, judgments and/or ordinances of any Governmental Authority.

         1.30     "Launch" means the initial shipping of a Product as a, or for,
commercial sale to an unaffiliated third party, excluding any shipping for test
marketing, clinical trial purposes or compassionate or similar use.

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         1.31     "[**]:

                  (a)   at any given time, both (i) Eyetech's Quarterly Cash
Flow for each of Eyetech's [**] most recently completed fiscal quarters [**]
and (ii) [**] for the [**] period ended on the last day of the most recently
completed fiscal quarter referred to in clause (i) has been equal to or greater
than [**];or

                  (b)   on the date of [**], both (i) the Quarterly Cash Flow
of the combination of [**] in connection with such [**] for each of such [**]
most recently completed fiscal [**] quarters [**] and (ii) the [**] period
ended on the last day of the most recently completed fiscal quarter referred to
in clause (i) has been equal to or greater than [**]; or

                   (c)  at any given time [**], both (i) the Quarterly Cash Flow
[**] in connection with such [**] as to periods [**] for each of such [**} most
recently completed fiscal quarters [**] and (ii) the [**] as to periods [**]
period ended on the last day of the most recently completed fiscal quarter
referred to in clause (i) has been equal to or greater than [**]; or

                   (d)  [**] pursuant to Section 17.11 of the Collaboration
Agreement.

As used in this Section 1.31 and the other provisions of this Agreement relating
to the defined terms used in this Section 1.31, (x) "fiscal quarters" shall
refer to full calendar quarters or successive periods of 13 weeks, as applicable
and [**] under this Agreement and the Collaboration Agreement [**] immediately
prior to the [**] related to such [**], but otherwise will include only [**] in
connection with or as part of [**].

Notwithstanding anything to the contrary contained herein, if any Quarterly
Cash Flow [**] referenced above is derived from financial statements for any
completed fiscal year ended on or before the last day of the most recently
completed fiscal quarter for which the Quarterly Cash Flow [**] is computed for
the purpose of [**] and either (a) such financial statements for such completed
fiscal year are not accompanied by an audit opinion of a nationally
recognized independent accounting firm or (b) the audit opinion accompanying
such financial statements contains a going concern qualification, then [**]
shall be deemed to exist based upon any such Quarterly Cash Flow [**].

         1.32     "Major Country" means France, Germany, Italy, Spain or the
United Kingdom.

         1.33     "MEEI/Draper License" means the License Agreement dated as of
April 4, 2002, by and among Eyetech, The Massachusetts Eye and Ear Infirmary
("MEEI") and The Charles Stark Draper Laboratory, Inc. ("Draper"), as amended
from time to time.

         1.34     "NDA" means a New Drug Application filed with the FDA with
respect to a Product.

         1.35     "Net Income" means, with respect to any Person (or any
combination of two or more Persons) for any fiscal period, the consolidated net
income (or loss) of such Person (or such combination on a pro forma basis), all
as determined in accordance with GAAP.

         1.36     "Net Sales" means the gross amounts billed or invoiced by
Pfizer, its Affiliates and sublicensees for Products in the ROW Territory, less
the following deductions:

                  (a)      trade, quantity and cash discounts allowed, but
expressly excluding discounts or allowances offered as part of a package of
products that includes a Product sold by Pfizer, its Affiliates or sublicensees;

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<PAGE>

                  (b)      refunds, chargebacks and any other allowances which
effectively reduce the net selling price;

                  (c)      actual product returns, credits and allowances
allowed to customers, and actual bad debts;

                  (d)      rebates actually paid or credited to any governmental
agency (or branch thereof) or to any third party payor, administrator or
contractee;

                  (e)      discounts mandated by, or granted to meet the
requirements of, applicable state, provincial or federal law, wholesaler,
including required chargebacks and retroactive price reductions;

                  (f)      transportation, freight, postage charges and other
charges, such as insurance, relating thereto, in each case included as a
specific line item on an invoice to such third parties; and

                  (g)      taxes, excises or other governmental charges upon or
measured by the production, sale, transportation, delivery or use of goods, in
each case included as a specific line item on an invoice to such third parties.

         If any such sales to third parties are made in transactions that are
not at arm's length between the buyer and the seller, then the gross amount to
be included in the calculation of Net Sales shall be the amount that would have
been invoiced had the transaction been conducted at arm's length. Such amount
that would have been invoiced shall be determined, wherever possible, by
reference to the average selling price of the relevant Product in arm's-length
transactions in the relevant country.

         If Pfizer, its Affiliate or sublicensee sells a Product in unfinished
form to a third party for resale, then the gross amount to be included in the
calculation of Net Sales arising from such sale

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shall be the amount invoiced by the third party upon resale, in lieu of the
amounts invoiced by Pfizer, its Affiliates or sublicensee when selling the
Product in unfinished form. Otherwise, where Pfizer, its Affiliate or
sublicensee sells a Product in finished form to a third party that does not
require a sublicense under the Eyetech Patent Rights for further resale (each
such third party hereinafter a "Distributor"), the amount to be included in the
calculation of Net Sales shall be the price invoiced from Pfizer or its
Affiliate or sublicensee to the third party, not the amount invoiced by the
third party upon resale.

         If, in addition to or in lieu of a transfer price paid for quantities
of Product supplied, any Distributor provides consideration to Pfizer, its
Affiliate or sublicensee in connection with any Product or the Distributor's
rights or relationship with Pfizer, its Affiliate or sublicensee in relation
thereto, then such consideration shall be included in the calculation of Net
Sales in the Quarter in which it becomes due to Pfizer or its Affiliate or
sublicensee (as applicable). Notwithstanding the foregoing, amounts received by
Pfizer, or its Affiliates or sublicensees, for the sale of Products among Pfizer
and its Affiliates or sublicensees for resale shall not be included in the
computation of Net Sales hereunder.

         Net Sales shall be determined from books and records maintained in
accordance with GAAP, consistently applied throughout the organization and
across all products of the entity whose sales of Product are giving rise to Net
Sales.

         1.37     "Party" means either Eyetech or Pfizer; "Parties" means both
Eyetech and Pfizer.

         1.38     "Patent Rights" means the rights and interest in and to all
issued patents and pending patent applications in any country in the Territory,
including, without limitation, all divisionals, continuations, renewals,
continuations-in-part, patents of addition, supplementary protection
certificates, extensions, registrations or confirmation patents and reissues
thereof.

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         1.39     "Person" means any natural person or any corporation, company,
partnership, joint venture, firm or other entity, including without limitation a
Party.

         1.40     "Pfizer Patent Rights" means all Patent Rights, Controlled by
Pfizer or its Subsidiaries as of the Effective Date or developed or acquired by
Pfizer or its Subsidiaries in the course of the activities contemplated by this
Agreement or the Collaboration Agreement, relating to, or useful in connection
with, the manufacture, use or sale of the Compound or the Products.

         1.41     "Pfizer Technical Information" means all scientific or
technical information and related know-how and trade secrets, Controlled by
Pfizer or its Subsidiaries as of the Effective Date or developed or acquired by
Pfizer or its Subsidiaries in the course of the activities contemplated by this
Agreement or the Collaboration Agreement, including but not limited to: (a)
medical, clinical, toxicological or other scientific data and (b) processes and
analytical methodology useful in the development, testing, analysis, manufacture
or packaging of the Compound or the Products.

         1.42     "Product Operating Profit" means Net Sales less the
Product-related costs attributable to the following: cost of goods sold; third
party royalties; advertising and promotion expenses, including but not limited
to Product samples, speaker programs and market research; field force costs,
including but not limited to field aids; continuing medical education programs;
research and development; destroyed returns, destroyed inventory and other
salvage; and other direct expenses relating to the manufacture, promotion and
sale of the Product, including but not limited to direct legal expenses.

         1.43     "Products" means any product, which (a) contains or is based
on the Compound, either alone or in combination with one or more other
therapeutically active substances, and (b) is for use in the Field; including
for the avoidance of doubt any AMD Product, DME Product or

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<PAGE>

other product developed for any new indication in the Field or as a new
un-pegylated formulation of any such AMD Product, DME Product or other product;
and which product either (x) if manufactured, used, sold, offered for sale, or
imported would, in the absence of the licenses granted hereunder, infringe a
Valid Claim, or (y) utilizes Eyetech Technical Information or Collaboration
Intellectual Property in its manufacture, use or development.

         1.44     "Quarter" means each of the periods ending on each of the four
(4) thirteen (13) week periods as used by Pfizer as reported in its filings with
the Securities and Exchange Commission, the first commencing on January 1 of any
year. For sake of clarification, outside the United States, Net Sales are
computed on each of four (4) thirteen (13) week periods, the first commencing on
December 1 of any year.

         1.45     "Quarterly Cash Flow" means, with respect to any Person (or
any combination of two or more Persons) for any fiscal quarter, such Person's
(or such combination's) Cash Flow for such fiscal quarter.

         1.46     "Regulatory Authority" means any Governmental Authority,
including without limitation EMEA or FDA, with responsibility for granting any
licenses or approvals (with the exception of price approvals) necessary for the
marketing and sale of pharmaceutical products in any country.

         1.47     "Royalty Term" means, on a country-by-country and
Product-by-Product basis, the period commencing on the Effective Date and ending
on the latest date on which such Product is covered by a Valid Claim, or fifteen
(15) years from the Launch of such Product in such country, whichever is later.

         1.48     "ROW Territory" means all countries in the world outside the
US Territory.

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         1.49     "SEC Reports" means all annual, quarterly or periodic reports
and registration statements required to be filed with the Securities and
Exchange Commission ("SEC") under applicable law.

         1.50     "Shearwater License" means the License, Manufacturing and
Supply Agreement dated as of February 5, 2002, by and between Eyetech and
Shearwater Corporation ("Shearwater"), as amended from time to time.

         1.51     "Subsidiary" means, with respect to a Party, a majority or
wholly owned direct or indirect subsidiary of such Party.

         1.52     "Technical Information" means Eyetech Technical Information or
Pfizer Technical Information.

         1.53     "Term" means the period commencing on the Effective Date and
ending on the expiration of the last-to-expire Royalty Term.

         1.54     "Territory" means the US Territory and the ROW Territory.

         1.55     "US Territory" means the United States of America, including
its territories, possessions and Puerto Rico.

         1.56     "Valid Claim" means any claim from (a) an issued and unexpired
patent included within the Eyetech Patent Rights or the Collaboration
Intellectual Property (other than, in the case of Collaboration Intellectual
Property, claims of Patent Rights that claim inventions solely owned by Pfizer
or solely licensed by Pfizer) that has not been revoked or held unenforceable or
invalid by a decision of a court or other Governmental Authority of competent
jurisdiction, and that has not been disclaimed, denied or admitted to be invalid
or unenforceable through reissue or disclaimer or otherwise; or (b) a patent
application included within the Eyetech Patent Rights or the Collaboration
Intellectual Property (other than, in the case of Collaboration Intellectual

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Property, claims of Patent Rights that claim inventions solely owned by Pfizer
or solely licensed by Pfizer) that has not been cancelled, withdrawn or
abandoned or been pending for more than [**] years.

         1.57     "Year" means a calendar year.

                                    ARTICLE 2

                                    LICENSES

         2.1      Eyetech Grants. Subject to the terms of this Agreement,
Eyetech hereby grants to Pfizer, and Pfizer hereby accepts:

                  (a)      an exclusive (even as to Eyetech) license under the
Eyetech Patent Rights and Eyetech Technical Information, and under Eyetech's
rights in Collaboration Intellectual Property, to develop, make, have made, use,
sell, offer for sale, import, and have imported Products in the ROW Territory
and a nonexclusive license under the Eyetech Patent Rights and Eyetech Technical
Information, and under Eyetech's rights in Collaboration Intellectual Property,
to use, make and have made Products in the US Territory solely for export to and
sale in countries in the ROW Territory; and

                  (b)      an exclusive (even as to Eyetech) license under the
Eyetech Patent Rights and Eyetech Technical Information, and under Eyetech's
rights in Collaboration Intellectual Property, to develop, make, have made, use,
sell, offer for sale, import, and have imported Products in the US Territory,
[**] under the Eyetech Patent Rights and Eyetech Technical Information, and
under Eyetech's rights in Collaboration Intellectual Property, to develop, make,
have made, use, sell, offer for sale, import, and have imported Products in the
US Territory [**}; provided that [**], as set forth in this Section 2.1(b) [**]
other than in accordance with the Collaboration Agreement; provided further that
if, [**] set forth in Section 1.31(b)[**] in this Section 2.1(b)[**] at such
time [**] set forth in Section 1.31(d) [**] set forth in Section 1.31(d) [**].
The [**] license set forth in this Section 2.1(b) is subject to all of Pfizer's
obligations under the Collaboration Agreement so long as the Collaboration
Agreement shall remain in effect.

                                       14
<PAGE>

                  (c)      The licenses granted by Eyetech in Sections 2.1(a)
and 2.1(b) are subject to a retained right of Eyetech to perform Eyetech's
obligations and exercise Eyetech's rights under the Collaboration Agreement and
the Other Product-Related Agreements.

                  (d)      The licenses granted in Sections 2.1(a) and (b)
include sublicenses, as applicable. The sublicenses granted by Eyetech to Pfizer
in Sections 2.1(a) and (b) are subject to the following terms of the Gilead
Agreement, the Isis Agreement and the Shearwater Agreement, respectively:

                           (i)      Sections 2.4, 2.5, 3.6, 3.8, 6.3 and 6.7 of
the Gilead Agreement;

                           (ii)     Sections 4.3 and 4.4 of the Isis Agreement;
and

                           (iii)    Sections 2.3, 3.2, 3.5, 4.1, 4.9, 8.1,
8.2.3, 9.1 and 9.6 of the Shearwater Agreement.

                  (e)      Any sublicensee obligations required by the Gilead
Agreement, the Isis Agreement and the Shearwater Agreement to be included in a
sublicense thereunder, including without limitation any required provision
making the applicable third party licensor a third party beneficiary of any
sublicense thereunder, shall be deemed to be included in this Agreement.

                  (f)      The licenses granted by Eyetech in Sections 2.1(a)
and 2.1(b) with respect to the patents referenced in the third paragraph of
Exhibit 8.1(i) hereof are subject to 35 USC Sections 200-212, 37 CFR Section 401
et seq. and applicable governmental implementing regulations. Any right granted
in this Agreement greater than that permitted under 35 USC Sections 200-212 or
37 CFR Section 401 et seq. shall be subject to modification as may be required
to conform to the provisions of those statutes. All rights reserved to the
United States government and others under 35 USC Sections 200-212 and 37 CFR
Section 401 shall remain and shall in no way be affected by this Agreement.

                                       15
<PAGE>

         2.2      License Grant to Eyetech. Pfizer hereby grants to Eyetech a
nonexclusive right and license (and sublicense, as applicable) under the Pfizer
Patent Rights and Pfizer Technical Information, and under Pfizer's rights in
Collaboration Intellectual Property, solely to Co-Promote the Products in the US
Territory and to exercise Eyetech's rights and perform Eyetech's obligations
under this Agreement and the Collaboration Agreement.

         2.3      Sublicensing.

                  (a)      The license in Section 2.1(a) above includes the
right by Pfizer to grant sublicenses; provided that, Eyetech's prior written
consent, not to be unreasonably withheld or delayed, shall be required for
sublicenses to non-Affiliates under such license. The license in Section 2.1(b)
above does not include any right by Pfizer to grant sublicenses without
Eyetech's prior written consent.

                  (b)      Any sublicense granted by Pfizer must be granted
pursuant to a written agreement that subjects the sublicensee to all relevant
restrictions, limitations and obligations in this Agreement and in the
Collaboration Agreement.

                  (c)      Pfizer shall be responsible for failure by its
sublicensees to comply with, and Pfizer guarantees to Eyetech the compliance by
each of its sublicensees with, all relevant restrictions, limitations and
obligations in this Agreement and in the Collaboration Agreement.

                  (d)      In the event of a material default by any sublicensee
under a sublicense agreement, Pfizer will inform Eyetech and take such action,
after consultation with Eyetech, that in Pfizer's reasonable business judgment
is required to address such default.

                  (e)      Pfizer shall provide Eyetech with a copy of each
sublicense agreement, in final executed form, that Pfizer enters into in
accordance with this Section 2.3 not later than five (5) days after the
execution of such sublicense agreement; provided that Pfizer may redact the

                                       16
<PAGE>

financial terms from such copies if permitted under the applicable requirements
of the Gilead License, the Shearwater License and the Isis License requiring
delivery to Gilead, Shearwater or Isis of copies of sublicense agreements.

                                   ARTICLE 3

                    BASE PAYMENTS AND PERFORMANCE MILESTONES

         In consideration of the licenses granted to Pfizer hereunder and the
disclosure to Pfizer of Eyetech Technical Information, and subject to the
provisions of this Agreement, Pfizer shall pay to Eyetech Base Payments and
Performance Milestones as follows:

         3.1      Base Payments.

                  (a)      Subject to the terms and conditions of this
Agreement, Pfizer shall pay to Eyetech the following payments (the "Base
Payments"):

<TABLE>
<CAPTION>
------------------------------------------------------------------------------
                   Event                                           Payment
------------------------------------------------------------------------------
<S>                                                               <C>

(i)      Signing of this Agreement.                                $75,000,000
------------------------------------------------------------------------------
(ii)     Acceptance for filing of [**] Product.                    $[**]
------------------------------------------------------------------------------
(iii)    Acceptance for filing of [**] Product.                    $[**]
------------------------------------------------------------------------------
(iv)     Approval of [**].                                         $[**]
------------------------------------------------------------------------------
(v)      Approval of [**].                                         $[**]
------------------------------------------------------------------------------
(vi)     Filing of [**].                                           $[**]
------------------------------------------------------------------------------
(vii)    Launch of [**].                                           $[**]
------------------------------------------------------------------------------
(viii)   Launch of [**].                                           $[**]
------------------------------------------------------------------------------
(ix)     Launch of [**].                                           $[**]
------------------------------------------------------------------------------
(x)      Launch of [**].                                           $[**]
------------------------------------------------------------------------------
</TABLE>

                                       17
<PAGE>

The Parties understand and agree that the payments referenced in this Section
3.1(a) are subject to the terms and conditions set forth in Sections 3.1(b) and
(c).

                  (b)      The signing fee set forth in Section 3.1(a)(i) shall
be made as set forth in Section 3.1(c) below. The payments pursuant to Sections
3.1(a)(ii) through 3.1(a)(v) shall be made within fifteen (15) days after
Pfizer's receipt from Eyetech of copies of the written notifications received by
Eyetech from [**]. The payments pursuant to Sections 3.1(a)(vi) through
3.1(a)(x) shall be made within fifteen (15) days after the date on which the
applicable event has been achieved.

                  (c)      Payment of the $75,000,000 signing fee will be made
by Pfizer no later than five (5) Business Days after the date of execution of
this Agreement to an account of a mutually satisfactory financial institution,
which will serve as Escrow Agent, pending occurrence of the Effective Date. All
amounts held in such account shall be held for the benefit of Eyetech and
Eyetech will receive interest accrued in accordance with the terms of the Escrow
Agreement. Upon the occurrence of the Effective Date, such amounts shall be
released to Eyetech in accordance with the terms of the Escrow Agreement.

         3.2      Performance Milestones.

                  (a)      Subject to the terms and conditions of this
Agreement, Pfizer shall pay to Eyetech the following payments (each, a
"Performance Milestone Payment") in respect of each of the following milestone
events (each, a "Performance Milestone"):

<TABLE>
<CAPTION>
--------------------------------------------------------------------------------------------------------
                                     Milestone Event                                 Payment Amount
--------------------------------------------------------------------------------------------------------
<S>                                                                                  <C>
(i)      In the event Net Sales in the [**] equal or exceed $[**] in any Year.           $[**]
--------------------------------------------------------------------------------------------------------
(ii)     In the event Net Sales in the [**] equal or exceed $[**] in any Year.           $[**]
--------------------------------------------------------------------------------------------------------
(iii)    In the event Net Sales in the [**] equal or exceed $[**] in any Year.           $[**]
--------------------------------------------------------------------------------------------------------
</TABLE>

                                       18
<PAGE>

<TABLE>
<S>                                                                                  <C>
--------------------------------------------------------------------------------------------------------
(iv)     In the event Net Sales in the [**] equal or exceed $[**] in any Year.           $[**]
--------------------------------------------------------------------------------------------------------
(v)      In the event Net Sales in the [**] equal or exceed $[**] in any Year.           $[**]
--------------------------------------------------------------------------------------------------------
</TABLE>

The Parties understand and agree that all of the Performance Milestone Payments
referenced in this Section 3.2(a) are subject to the terms and conditions set
forth in Sections 3.2(b) and (c).

                  (b)      Performance Milestone Payments shall be due and
owing, on or before the date sixty (60) days after the end of the applicable
Year, commencing with the first full Year following (or commencing concurrently
with, if Launch occurs on January 1 of any Year) the first Launch of an AMD
Product in the US Territory and for the subsequent [**] Years immediately
following such first full Year.

                  (c)      Subject to the limitation set forth in Section
3.2(b), each Performance Milestone Payment shall be paid in annual installments
of twenty percent (20%) of the total payment amount over five (5) Years,
commencing with the first Year in which such Performance Milestone is achieved
and continuing for each of the immediately following four (4) Years during which
the Performance Milestone is achieved. It is agreed and understood that no
Performance Milestone Payment (taking all annual installments as a single
Performance Milestone Payment) shall be payable more than once. For the
avoidance of doubt, the following examples are provided to illustrate how
Performance Milestone Payments might be paid:

                                   Example #1

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------
                           Year 1        Year 2        Year 3         Year 4        Year 5        Year 6
------------------------------------------------------------------------------------------------------------
<S>                        <C>           <C>           <C>            <C>           <C>           <C>
Aggregate Net Sales         $[**]         $[**]         $[**]          $[**]         $[**]         $[**]
Level [**]
------------------------------------------------------------------------------------------------------------
</TABLE>

                                       19
<PAGE>

<TABLE>
<S>                         <C>           <C>           <C>            <C>           <C>           <C>
------------------------------------------------------------------------------------------------------------
Performance Milestone       $[**]         $[**]         $[**]          $[**]         $[**]         $[**]
Payment to Eyetech
------------------------------------------------------------------------------------------------------------
</TABLE>

                                       20
<PAGE>

                                   Example #2

<TABLE>
<CAPTION>
----------------------------------------------------------------------------------------------
                                      Year 1      Year 2      Year 3      Year 4      Year 5
----------------------------------------------------------------------------------------------
<S>                                   <C>         <C>         <C>         <C>         <C>
Aggregate Net Sales Level [**]        >$[**]      >$[**]      >$[**]      >$[**]      >$[**]
                                      <$[**]      <$[**]      <$[**]      <$[**]
----------------------------------------------------------------------------------------------
>$[**]>$[**]                            [**]        [**]        [**]        [**]        [**]
>$[**]
>$[**]
>$[**]
----------------------------------------------------------------------------------------------
Total Performance Milestone            $[**]       $[**]       $[**]       $[**]       $[**]
Payments to Eyetech
----------------------------------------------------------------------------------------------
</TABLE>

For avoidance of doubt, the five (5) consecutive Year period during which each
Performance Milestone Payment is payable in increments may be a different five
(5) consecutive Year period for each of the respective Performance Milestone
Payments (e.g., in Example #2 above, the Performance Milestone Payment for
achieving an aggregate annual Net Sales level [**] of $[**] would continue to be
payable in installments in years 6 and 7 if the Performance Milestone were
achieved in such years notwithstanding the fact that the Performance Milestone
Payment for achieving an aggregate annual Net Sales level [**] of $[**] would no
longer be payable after year 5).

                                    ARTICLE 4

                                  REVENUE SHARE

         4.1      Revenue Share. In consideration of the licenses granted to
Pfizer hereunder and the disclosure to Pfizer of Eyetech Technical Information,
and subject to the terms and conditions of this Agreement, Pfizer shall share
revenues with Eyetech based on Net Sales by Pfizer, its Affiliates and
sublicensees [**] in accordance with the following:

                                       21
<PAGE>

                  (a)      EU. With respect to Net Sales in the EU in each Year,
Pfizer shall pay Eyetech [**] (x) for aggregate Net Sales of all Products in
such Year below $[**], a royalty of [**] percent ([**]%) of such Net Sales, and
(y) for aggregate Net Sales of all Products in such Year of $[**] or more, a
royalty of [**] percent ([**]%) of such incremental Net Sales.

                  (b)      Rest of ROW Territory. With respect to Net Sales in
the ROW Territory, excluding the EU, Pfizer shall pay Eyetech a royalty of [**]
percent ([**]%) of aggregate Net Sales of all Products.

                  (c)      Royalty Adjustments for Generic Products. If, during
a given Quarter, there is Generic Competition in a particular country, then, for
each such country in which there is Generic Competition, the royalties set forth
in Section 4.1(a) or 4.1(b) shall be reduced by [**] percent ([**]%).
Notwithstanding anything to the contrary in this Section 4.1(c) or in Section
4.1(d) or 10.7, in no event shall the aggregate reduction in the royalty
payments otherwise payable under Section 4.1(a) or 4.1(b) with respect to any
given Net Sales of Products in a country be reduced by more than an aggregate of
[**] percent ([**]%) as a result of the royalty reduction provisions of this
Section 4.1(c) and Sections 4.1(d) and 10.7.

                  (d)      Revenue Share Term. Royalty payments [**] under this
Section 4.1 shall continue on a Product-by-Product and country-by-country basis
for the applicable Royalty Term; provided that during portions of any Royalty
Term in which no Valid Claim exists with respect to a Product in a country, the
royalty payments otherwise payable under Section 4.1(a) or 4.1(b) shall, subject
to the limitations set forth in Section 4.1(c), be reduced by [**] percent
([**]%).

                  (e)      Certain ROW Sales. Pfizer shall not, for the purpose
of circumventing the higher royalty payable in respect of EU Net Sales, sell
Products to a third party in the ROW

                                       22
<PAGE>

Territory outside of the EU in situations in which Pfizer knows that such third
party will resell the Products into the EU.

         4.2      Survival of Licenses After Expiration of Royalty Term and
After Expiration of Co-Promotion Term. Upon expiration of each Royalty Term, on
a Product-by-Product and country-by-country basis, the licenses set forth in
Section 2.1(a) and, subject to Pfizer continuing to manufacture the Products in
accordance with the same quality standards observed by Pfizer with respect to
the manufacture of Products during the Royalty Term, the license to Trademarks
in the ROW Territory set forth in Section 10.1(d) of the Collaboration Agreement
shall become fully paid-up and perpetual with respect to such Product in such
country. Upon expiration of the Co-Promotion Term, on a Product-by-Product
basis, the licenses set forth in Sections 2.1(b) shall become fully paid-up,
perpetual non-exclusive licenses with respect to such Product in the US
Territory. For the avoidance of doubt, this Section 4.2 shall not apply with
respect to any license set forth in Section 2.1 that is terminated before the
applicable Royalty Term or Co-Promotion Term expires, as applicable.

         4.3      Third Party Royalties. With respect to royalties payable to
third parties payable based on sales of Products:

                  (a)      With respect to such Net Sales in the US Territory,
Eyetech shall pay such royalties and include all such royalty payments in its
Quarterly Expense Reports (as defined in Section 8.6(b) of the Collaboration
Agreement) for the purpose of including such royalty payments in calculations of
the quarterly payments payable pursuant to Section 8.6(d) of the Collaboration
Agreement.

                  (b)      With respect to such sales in the ROW Territory,
Pfizer shall be responsible for [**] percent ([**]%) of such royalties, except
as provided for in subsection (d)

                                       23
<PAGE>

below. For the avoidance of doubt, in the event that any withholding or other
taxes are payable by Pfizer on any third party royalty payments due with respect
to sales in the ROW Territory, then Pfizer shall make such tax payments in
addition to making the payments to Eyetech set forth in the immediately
preceding sentence. If any withholding or other taxes are payable by Eyetech on
any third party royalty payments due with respect to sales in the ROW Territory,
and such taxes are not deductible from the royalty payments due to the third
parties, then Pfizer shall pay to Eyetech an additional amount equal to such
taxes. Pfizer shall indemnify Eyetech and its Affiliates and their respective
directors, officers, employees and agents from and against any liability with
respect to withholding or other taxes that are payable by Pfizer or Eyetech on
any third party royalty payments due with respect to sales in the ROW Territory.
The Parties shall establish such procedures as are reasonably necessary to
permit them to reconcile Eyetech's actual payments of such third party royalties
with Pfizer's payments to Eyetech under this Section 4.3(b). Notwithstanding the
foregoing provisions of this Section 4.3(b), Pfizer shall not have any
responsibility for withholding taxes that become payable solely as a result of
an assignment by Eyetech of Eyetech's rights to receive payments from Pfizer to
an Affiliate of Eyetech or other third party.

                  (c)      With respect to Pfizer's responsibility for the
payments of royalties payable by Eyetech to third parties payable based on Net
Sales as set forth in Section 4.3(b), Eyetech shall send Pfizer a quarterly
invoice that shall be based on Pfizer's quarterly report of Net Sales pursuant
to Section 5.2 and shall reflect the amounts due from Pfizer under Section
4.3(b). Pfizer shall, within fifteen (15) days after its receipt of such
invoice, make payment under such invoice by electronic transfer in immediately
available funds to the account

                                       24
<PAGE>

designated in writing by Eyetech, which designation shall take place at least
two (2) Business Days before the payment is due.

                  (d)      Pfizer shall be entitled to deduct a portion of third
party royalties payable by Pfizer with respect to sales in the EU from royalties
otherwise payable to Eyetech pursuant to Section 4.1(a) as follows:

                           (i)      With respect to third party royalties
payable pursuant to third party agreements, other than the MEEI/Draper License,
entered into by Eyetech prior to the Execution Date, on sales of Products in the
EU corresponding to increments of aggregate Net Sales of all Products in the EU
of greater than $[**] in any Year, Pfizer may deduct [**]percent ([**]%) of such
incremental third party royalties.

                           (ii)     With respect to third party royalties
payable pursuant to any other third party license agreement, other than the
MEEI/Draper License, on sales of Products in the EU corresponding to increments
of aggregate Net Sales of all Products in the EU of greater than $[**] in any
Year, which agreement is necessary to avoid infringement of third party rights
with respect to Products in the EU, Pfizer may deduct [**] percent ([**]%) of
such incremental third party royalties, up to a maximum aggregate deduction in
any Year of [**] percent ([**]%) of such incremental Net Sales.

                  (e)      Notwithstanding anything to the contrary contained
herein, any and all third party royalties which relate to or otherwise result
from any misrepresentation or breach of Eyetech's representations or warranties
contained in this Agreement or the Collaboration Agreement shall be excluded
from the provisions of this Section 4.3.

                  (f)      Nothing in this Section 4.3 shall be construed to
limit either Party's indemnification obligations pursuant to the Collaboration
Agreement.

                                       25
<PAGE>

                  (g)      After the Effective Date, Eyetech shall use
commercially reasonable efforts to negotiate and execute any amendments to the
Gilead License, Shearwater License and Isis License necessary to conform the
definitions of "Net Sales" (or comparable terms thereunder) with the definition
of "Net Sales" hereunder, so as to provide for an equivalent basis for
calculating royalties due under the Gilead License, Shearwater License and Isis
License as is used under this Agreement; provided that Eyetech shall have no
obligation to pay any money to obtain such amendments and Eyetech shall have no
obligation to enter into any amendment that would increase Eyetech's or its
sublicensees' (including Pfizer's) royalty or other obligations under the Gilead
License, Shearwater License or Isis License.

                                    ARTICLE 5

                     ACCOUNTING AND PROCEDURES FOR PAYMENTS.

         Payments hereunder shall be subject to the following provisions:

         5.1      Sales Subject to Royalty Obligations. Sales between or among
Pfizer, its Affiliates or sublicensees shall not be subject to royalties under
Section 4.1; royalties shall only be calculated upon sales by Pfizer, its
Affiliates and sublicensees to independent third parties. Pfizer shall be
responsible for payment obligations arising from sales by its Affiliates and
sublicensees.

         5.2      Royalty Payments; Royalty Reports; Pfizer Operating Profit.

                  (a)      Pfizer shall provide Eyetech with a report of Net
Sales with respect to each Quarter (based on the quarters specified in the
second sentence of Section 1.44) within forty-five (45) days after the end of
such period, which report shall identify, on a country-by-country basis, the
Product, gross sales, Net Sales, deductions from gross sales taken to calculate
Net Sales, and the royalty amount payable to Eyetech under Section 4.1, as well
as the

                                       26
<PAGE>

computation of such royalty amount. Pfizer shall make royalty payments to
Eyetech on Net Sales with respect to each Quarter within sixty (60) days after
the end of each such period. Royalty reports shall be kept confidential by
Eyetech and not disclosed to any other party other than Gilead, Shearwater, Isis
and their respective accountants and Boards of Directors. In addition, Eyetech
shall be entitled to disclose such information as required for the purposes of
preparing and disclosing to third parties Eyetech's financial statements, as
required to comply with applicable Laws or requirements imposed by any stock
exchange or Nasdaq and to third party lenders in connection with Eyetech's
financing activities.

                  (b)      Within ninety (90) days of the end of the final
Quarter of each Year during the Term, Pfizer will provide Eyetech with a report
[**] by which [**] and pay [**] to Eyetech together with such report.

         5.3      Currency Exchange; Late Payments. All payments made hereunder
shall be made in U.S. dollars and shall be made by electronic transfer in
immediately available funds to such bank account as Eyetech shall designate in
writing at least five (5) business days before the payment is due. For the
purposes of determining the amount of royalties due for the relevant Quarter,
the amount of Net Sales in any foreign currency shall be computed by (a)
converting such amount for the relevant Quarter into U.S. dollars at the Average
Exchange Rate for the Quarter (the "Average Exchange Rate" means, for each
Quarter for each currency in which Products sales to third parties are
denominated, the average of the prevailing commercial rate of exchange for
purchasing U.S. dollars with such currency on the last business day of each
Pfizer accounting period in the relevant Quarter as published in The Financial
Times), and (b) deducting the amount of any governmental tax, duty, charge or
other fee actually paid by Pfizer or its Affiliates in respect of such
conversion into and remittance of U.S. dollars. All payments

                                       27
<PAGE>

under this Agreement shall bear interest from the date due until paid at a rate
equal to the prime rate of Citibank, NA as announced on the date such payment
was due plus three percent (3%), compounded on a calendar quarterly basis. In
addition, Pfizer shall reimburse Eyetech for all reasonable costs and expenses,
including without limitation reasonable attorneys' fees and legal expenses,
incurred in the collection of late payments.

         5.4      Withholding Taxes. Except as otherwise provided in Section
4.3(b), any taxes required to be paid or withheld by Pfizer, its Affiliates or
sublicensees for the account of Eyetech on amounts payable under this Agreement
shall be deducted from the amounts payable at the rates specified by applicable
Law. In addition, Pfizer shall provide promptly to Eyetech receipts from the
government or taxing authority-evidencing payment of such taxes.

         5.5      Audits. Pfizer shall, and shall cause its Affiliates and
sublicensees to, keep full and accurate books and records setting forth gross
sales, Net Sales, Product Operating Profit for the EU and amounts payable to
Eyetech. Pfizer shall permit Eyetech, at Eyetech's sole expense, by a nationally
recognized independent certified public accountants selected by Eyetech (as to
which Pfizer has no reasonable objection), to examine such books and records
upon at least thirty (30) days' advance written notice during normal business
hours and in a manner that does not materially interfere with Pfizer's business,
but not later than three (3) years following the rendering of any such reports,
accountings and payments. The foregoing right of review may be exercised only
once with respect to each such periodic report and payment. Such accountants may
be required by Pfizer to enter into a reasonably acceptable confidentiality
agreement, and in no event shall such accountants reveal to Eyetech the details
of its review except insofar as is necessary to verify the accuracy of reports
and payments made or due hereunder. The results of any such audit shall be
delivered in writing to each Party. Any underpayment determined by such audit
shall promptly

                                       28
<PAGE>

be paid or refunded by Pfizer. If Pfizer has underpaid amounts due under this
Agreement by more than five percent (5%) over any reporting period, Pfizer shall
also reimburse Eyetech for the cost of such audit (with the cost of the audit to
be paid by Eyetech in all other cases), plus interest at the interest rate set
forth in Section 5.3, from the date of any such underpayment. Any dispute
arising out of any such audit and any other dispute arising out of the Parties'
respective payment obligations under this Agreement shall be resolved through
binding arbitration in accordance with Article 11, and either party may submit
such dispute to such binding arbitration.

         5.6      Blocked Payments. In the event that, by reason of applicable
Laws or regulations in any country, it becomes impossible or illegal for Pfizer
to transfer, or have transferred on its behalf, royalties or other payments to
Eyetech, such royalties or other payments shall be deposited in local currency
in the relevant country to the credit of Eyetech in a recognized banking
institution designated by Eyetech or, if none is designated by Eyetech within a
period of thirty (30) days, in a recognized banking institution selected by
Pfizer and identified in a notice in writing given to Eyetech.

                                    ARTICLE 6

                         TECHNICAL AND OTHER INFORMATION

         6.1      Disclosure of Technical Information. Promptly upon execution
and delivery of this Agreement, and thereafter periodically during the Term
(periodically shall mean, except as otherwise provided in the Collaboration
Agreement, at least calendar quarterly prior to the first Approval of a Product
in the Territory, and thereafter at least annually), Pfizer and Eyetech shall
each disclose to the other all Eyetech Technical Information and Pfizer
Technical Information not previously disclosed. Each report shall be in the
format and contain the level of detail to be reasonably agreed upon by the
Parties. All Eyetech Technical Information heretofore disclosed

                                       29
<PAGE>

by Eyetech to Pfizer shall be deemed to have been disclosed pursuant to this
Agreement and shall be subject to the provisions of this Agreement, including
but not limited to this Article 6.

         6.2      Confidentiality. During the Term and for five (5) years after
the expiration or termination of this Agreement, each Party shall maintain
Confidential Information (as defined in Section 11.2 of the Collaboration
Agreement) provided by the other Party in confidence, and shall not disclose,
divulge or otherwise communicate such Confidential Information to others, or use
it for any purpose other than as permitted under this Agreement and the
Collaboration Agreement. The receiving Party shall have the right to disclose
Confidential Information received from the other Party to governmental agencies
to the extent reasonably required or desirable to secure Approval for marketing
of Products (provided that the receiving Party shall use reasonable efforts to
secure confidential treatment thereof), and to preclinical and clinical
investigators where reasonably necessary or desirable for their information to
the extent normal and usual in the custom of the trade and under a
confidentiality agreement with provisions governing confidentiality and non-use
substantially the same as those contained herein.

         6.3      Publicity Related to this Agreement. The Parties recognize
that each Party may from time to time desire to issue press releases and make
other public statements or disclosures regarding the subject matter of this
Agreement. In such event, the Party desiring to issue an a press release or make
a public statement or disclosure shall provide the other Party with a copy of
the proposed press release, statement or disclosure for review and approval in
advance, which advance approval shall not be unreasonably withheld, conditioned
or delayed. No other public statement or disclosure concerning the existence or
terms of this Agreement shall be made, either directly or indirectly, by either
Party hereto, without first obtaining the written approval of the other Party.
Once any public statement or disclosure has been approved in accordance with
this

                                       30
<PAGE>

Section, then either Party may appropriately communicate information contained
in such permitted statement or disclosure. Notwithstanding the foregoing
provisions of Section 5.2, Section 6.2 or this Section 6.3, a Party may (a)
disclose the existence and terms of the Transaction Agreements (as defined in
the Collaboration Agreement) where required, as reasonably determined by the
disclosing Party, by applicable Law, by applicable stock exchange or Nasdaq
regulation or by order or other ruling of a competent court, (b) disclose the
existence and terms of the Transaction Agreements under obligations of
confidentiality to agents, advisors, contractors, investors and sublicensees,
and to potential agents, advisors, contractors, investors and sublicensees, in
connection with such Party's activities hereunder and in connection with such
Party's financing activities and (c) publicly announce any of the matters set
forth in Exhibit 17.14(c) of the Collaboration Agreement, provided that such
announcements do not entail disclosure of non-public technical or scientific
information (which for clarity, excludes clinical trial results) and the
announcing Party provides the other Party with a copy of the proposed text of
such announcement sufficiently in advance of the scheduled release or
publication thereof to afford such other Party a reasonable opportunity to
review and comment upon the proposed text.

         6.4      Applicability of Obligations to Affiliates, Employees,
Directors, Agents, Independent Contractors and Consultants. The confidentiality
obligations of the Parties under this Article 6 shall be applicable to Parties,
as well as their respective Affiliates, employees, directors, agents,
independent contractors and consultants.

                                    ARTICLE 7

                                     PATENTS

         7.1      Third Party License Agreements. The Parties acknowledge that
the provisions of this Article 7 are subject in all respects to the provisions
of any license agreements between

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<PAGE>

Eyetech and third party licensors of the Eyetech Patent Rights and the
obligations of Eyetech and the rights of Pfizer under this Article 7 are limited
accordingly. Eyetech and Pfizer shall, within the foregoing constraints,
cooperate in the continued prosecution and maintenance by Eyetech or Gilead of
the Eyetech Patent Rights listed on Exhibit 1.18 and licensed to Eyetech by
Gilead. After the Effective Date, Eyetech shall not, without Pfizer's consent,
enter into any third party license agreement relating to material Patent Rights
that Eyetech proposes to license from a third party and that Eyetech reasonably
foresees would, upon the execution of such third party license agreement,
constitute Eyetech Patent Rights, if Pfizer's obligations, pursuant to
Section(s) 4.3(a) and/or 4.3(b), to share in or pay the royalties payable under
third party license agreements, as applicable, would apply to royalties payable
under such third party license agreement; provided that if Eyetech proposes to
license Patent Rights from a third party that would, upon the execution of such
third party license agreement, constitute Eyetech Patent Rights, and Pfizer
withholds its consent for more than thirty (30) days after Eyetech notifies
Pfizer that Eyetech proposes to license such Patent Rights, then Eyetech may
elect to license such Patent Rights at Eyetech's sole expense, in which case
such Patent Rights shall be excluded from the Eyetech Patent Rights.

         7.2      Disclosure of Patent Applications and Proceedings. Eyetech
shall disclose to Pfizer the complete texts of all patent applications within
the Eyetech Patent Rights filed by Eyetech, or by Eyetech's licensors to the
extent Eyetech is permitted to provide such texts to Pfizer under the terms of
Eyetech's agreements with such licensors, as well as information received
concerning the institution or possible institution of any interference,
opposition, re-examination, reissue, revocation or any official proceeding
involving patents and patent applications within the Eyetech Patent Rights
prosecuted and/or maintained by Eyetech, or by

                                       32
<PAGE>

Eyetech's licensors to the extent Eyetech receives such information, anywhere in
the Territory. Pfizer shall have the right to review all such pending
applications and other proceedings and make recommendations to Eyetech, and to
Eyetech's licensors if permitted under the terms of Eyetech's agreements with
such licensors, concerning such applications and proceedings and their conduct.
Eyetech agrees, subject to any limitations set forth in Eyetech's agreements
with Eyetech's licensors, to keep Pfizer promptly and fully informed of the
course of such patent prosecution and other proceedings including, without
limitation, by providing Pfizer with copies of all substantive communications
submitted to or received from patent offices throughout the Territory. Pfizer
shall provide such patent consultation at no cost to Eyetech or its licensors,
and shall hold all information disclosed to it under this Section 7.2 as
confidential subject to the provisions of Article 6 of this Agreement.

         7.3      Prosecution and Maintenance; Costs. Eyetech shall not abandon
any Eyetech Patent Rights with respect to which Eyetech controls prosecution and
maintenance activities, either directly or through step-in rights granted to
Eyetech in any third party license agreement, without at least 90 days' prior
notice of such abandonment to Pfizer. If Eyetech decides to abandon any such
Eyetech Patent Rights, Pfizer shall have the option to continue the prosecution
and maintenance of such Eyetech Patent Rights in Eyetech's name at Pfizer's
expense, subject to any limitations set forth in Eyetech's agreements with
Eyetech's licensors. If Pfizer desires that Eyetech file any application for a
patent in specific countries, or file any patent applications on improvements
and variations upon inventions disclosed in the Eyetech Patent Rights or
otherwise relating to the Compound or the Products, Pfizer shall advise Eyetech
of such countries or improvements, variations or inventions, as the case may be.
Eyetech shall consider Pfizer's request in good faith and shall not unreasonably
decline to file the requested patent

                                       33
<PAGE>

application and, if Eyetech files the patent applications as requested, Pfizer
shall pay all reasonable expenses, including reasonable fees for patent counsel,
for filing and for prosecuting such requested patent applications; provided that
Eyetech may decline to file the requested patent application if Eyetech does not
possess all legal rights necessary to make such filing. Pfizer shall have
reasonable access to all documentation, filings and communications to or from
the respective patent offices and shall be kept advised as to the status of all
pending applications to the extent pertaining to the Compound or any Products
and to the extent Eyetech is able to provide such access, it being understood
that all such documentation, filings and communications shall constitute
Confidential Information of Eyetech. Unless otherwise explicitly set forth above
in this Section 7.3, the Parties shall each be responsible for fifty percent
(50%) of the Parties' patent prosecution and maintenance costs relating to the
Eyetech Patent Rights in the US Territory and Pfizer shall be responsible for
one hundred percent (100%) of the Parties' patent prosecution and maintenance
costs relating to the Eyetech Patent Rights in the ROW Territory. Eyetech shall
include all such US Territory costs in Eyetech's Quarterly Expense Reports
pursuant to Section 8.6(b) of the Collaboration Agreement. Pfizer shall
reimburse Eyetech for Pfizer's share of all such ROW Territory costs within
thirty (30) days after receiving any invoice from Eyetech for such costs.

         7.4      Third Party Infringement Actions. If any third party shall in
the reasonable opinion of either Party, within any country in the Territory,
infringe any Eyetech Patent Rights through infringing activities in the Field,
the Party learning of such infringement shall promptly notify the other Party
and provide it with any available evidence of such possible infringement. In the
ROW Territory, as between Pfizer and Eyetech, and subject to any rights retained
by Eyetech's licensors, Pfizer shall have the first right to bring suit and to
take action against such infringer in its own name, or in the name of Eyetech
(or Eyetech's licensor, to the extent Eyetech

                                       34
<PAGE>

possesses the rights necessary to enable Pfizer to join such licensor under the
terms of Eyetech's license agreement with such licensor; provided that Eyetech
shall have no liability for any failure of such licensor to appear or cooperate
in such action) where necessary, in which case Pfizer shall control the
prosecution of any such suit or claim, including without limitation the choice
of counsel, and shall have the exclusive right to settle or dispose of any such
suit or claim. In the US Territory, as between Pfizer and Eyetech, and subject
to any rights retained by Eyetech's licensors, Eyetech shall have the first
right to bring suit and to take action against such infringer in its own name,
or in the name of Pfizer where necessary, in which case Eyetech shall control
the prosecution of any such suit or claim, including without limitation the
choice of counsel, and shall have the exclusive right to settle or dispose of
any such suit or claim. Notwithstanding anything to the contrary in this Section
7.4, but subject to any legal obligations of Eyetech to its licensors with
respect to Eyetech Patent Rights, if a Party fails to initiate a suit or take
other appropriate action that it has the initial right to initiate or take
pursuant to this Section 7.4 within ninety (90) days after becoming aware of the
basis for such suit or action, then the other Party may, in its discretion,
provide the Party having the initial right with written notice of such other
Party's intent to initiate a suit or take other appropriate action. If such
other Party provides such notice and the Party having the initial right fails to
initiate a suit or take such other appropriate action within thirty (30) days
after receipt of such notice from the other Party, then the other Party shall
have the right to initiate a suit or take other appropriate action that it
believes is reasonably required to protect the intellectual property rights at
issue. Notwithstanding the foregoing provisions of this Section 7.4, in the case
of an infringement action pursuant to Section 505(b) of the Act, subject to any
legal obligations of Eyetech to its licensors with respect to Eyetech Patent
Rights, if the Party that has the initial right to initiate such action fails to
notify

                                       35
<PAGE>

the other Party, at least fifteen (15) days prior to such Party's deadline under
the Act for bringing such action, that such Party will bring such action, then
the other Party may, in its discretion, initiate such action after giving
written notice of such election to the Party with the initial right to initiate
such action. The proceeds of any recovery, court award or settlement of such
action shall, after any required payments to Eyetech's licensors, first be
applied to reimburse the Parties for the costs and expenses of such prosecution
and the balance shall be paid, for amounts relating to the US Territory, [**]
percent ([**]%) to Pfizer and [**] percent ([**]%) to Eyetech, and for amounts
relating to the ROW Territory, [**] percent ([**]%) to Pfizer and [**] percent
([**]%) to Eyetech.

         7.5      Patent Term Extensions. The Parties shall cooperate, if
necessary and appropriate, with each other in gaining patent term extension
wherever applicable to Eyetech Patent Rights. The Parties shall, if necessary
and appropriate, use reasonable efforts to agree upon a joint strategy relating
to patent term extensions, but, in the absence of mutual agreement with respect
to any extension issue, a patent shall be extended if either Party elects to
extend such patent. Eyetech shall use commercially reasonable efforts to obtain
from Gilead the right to make determinations with respect to patent term
extensions pursuant to 35 U.S.C. Paragraph 156 ("Hatch-Waxman Extension") for
each Product for which regulatory approval is obtained in the US Territory, it
being agreed that such commercially reasonable efforts shall not require
Eyetech to pay any money to obtain such right. The Parties shall mutually agree
upon the patent for any Hatch-Waxman Extension prior to FDA approval of each
Product. If Eyetech has not obtained the right from Gilead to control
determinations respecting Hatch-Waxman Extensions, Eyetech will advise Gilead
as to the patent selected by the Parties for such extension, and will use
commercially reasonable efforts to have Gilead seek a Hatch-Waxman Extension
for such patent, it being agreed that such commercially reasonable efforts
shall not require Eyetech to pay any money to have Gilead take such action. The
Parties shall each be responsible for fifty percent (50%) of the costs of
seeking and/or obtaining patent term extensions relating to the Eyetech Patent
Rights in the US Territory and Pfizer shall be responsible for one hundred
percent (100%) of the costs of seeking and/or obtaining patent term extensions
relating to the Eyetech Patent Rights in the ROW Territory. Eyetech shall
include all such US Territory costs in Eyetech's Quarterly Expense Reports
pursuant to Section 8.6(b) of the Collaboration Agreement. Pfizer shall
reimburse Eyetech for all such ROW Territory costs incurred by Eyetech within
thirty (30) days after receiving any invoice from Eyetech for such costs.

                                       36
<PAGE>

         7.6      US Territory Intellectual Property Infringement Claims. Each
Party's indemnification obligations to the other Party with respect to any
actions, claims, demands, suits or other legal proceedings are brought or
threatened to be brought against either Party by a third party for infringement
of such third party's trademarks, know-how, Patent Rights or other intellectual
property rights relating to the Parties' Co-Promotion of Products by virtue of
the Parties' manufacture, use, sale, offer for sale or importation of Products
hereunder or under the Collaboration Agreement in furtherance of such
Co-Promotion of Products are set forth in Section 12.6 of the Collaboration
Agreement.

         7.7      ROW Territory Intellectual Property Infringement Claims. Each
Party's indemnification obligations to the other Party with respect to any
actions, claims, demands, suits or other legal proceedings are brought or
threatened to be brought against either Party by a third party for infringement
of such third party's trademarks, know-how, Patent Rights or other intellectual
property rights relating to Pfizer's commercialization of Products in the ROW
Territory by virtue of the Parties' manufacture, use, sale, offer for sale or
importation of Products hereunder or under the Collaboration Agreement in
furtherance of such commercialization of Products in the ROW Territory are set
forth in Section 12.6 of the Collaboration Agreement.

         7.8      Ownership and Prosecution of Patent Rights Included in the
Collaboration Intellectual Property. As between Eyetech and Pfizer, (a) Eyetech
shall solely own all inventions included in the Collaboration Intellectual
Property invented solely by Eyetech's employees and agents, (b) Pfizer shall
solely own all inventions included in the Collaboration Intellectual Property
invented solely by Pfizer's employees and agents, and (c) the Parties shall
jointly own all inventions included in the Collaboration Intellectual Property
invented by employees and agents of both Parties. Inventorship shall be
determined in accordance with United States patent

                                       37
<PAGE>

law. Each Party shall have the first right to prosecute and maintain Patent
Rights included in the Collaboration Intellectual Property solely owned by such
Party and Eyetech shall have the first right to prosecute and maintain Patent
Rights included in the Collaboration Intellectual Property jointly owned by the
Parties. Neither Party shall abandon any Patent Rights included in the
Collaboration Intellectual Property that such Party has the first right to
prosecute and maintain without at least 90 days' prior notice of such
abandonment to the other Party. If a Party decides to abandon any such Patent
Rights, the other Party shall have the option to continue the prosecution and
maintenance of such Patent Rights in the name(s) of the Party or Parties owning
such Patent Rights and at such other Party's expense. The costs of prosecuting
and maintaining Patent Rights included in the Collaboration Intellectual
Property shall be shared equally by the Parties in the US Territory and borne
entirely by Pfizer in the ROW Territory; provided that either Party may elect
not to pay such costs with respect to any given Patent Rights included in the
Collaboration Intellectual Property being prosecuted and/or maintained by the
other Party incurred from and after such time as such Party notifies the other
Party of such election, and thereafter any licenses granted in this Agreement by
the other Party to the Party making such election shall exclude such Patent
Rights. Such costs of prosecuting and maintaining Patent Rights included in the
Collaboration Intellectual Property in the US Territory shall be included in the
Parties' Quarterly Expense Reports pursuant to Section 8.6(b) of the
Collaboration Agreement. Pfizer shall reimburse Eyetech for all such costs of
prosecuting and maintaining Patent Rights included in the Collaboration
Intellectual Property in the ROW Territory incurred by Eyetech within thirty
(30) days after receiving any invoice from Eyetech for such costs.

                                       38
<PAGE>

                                    ARTICLE 8

                    REPRESENTATIONS, WARRANTIES AND COVENANTS

         8.1      Eyetech Representations and Warranties. Eyetech hereby
represents and warrants, as of the date hereof, to Pfizer as follows:

                  (a)      To the best of Eyetech's knowledge, (i) the issued
Eyetech Patent Rights are valid and enforceable patents, (ii) no third party is
infringing any such Eyetech Patent Rights and (iii) except for the third party
intellectual property rights referred to in the letter from Harsha Murthy to
Larry Miller dated December 17, 2002, the manufacture, use, sale, offer for sale
or importation by Pfizer or Eyetech of the Compound described in Exhibit 1.8 or
the Product being used by Eyetech in clinical trials as of the Execution Date
will not infringe any issued patents of third parties and are not covered by
third party patent applications containing claims that would, if issued, be
infringed. Eyetech has furnished to Pfizer all material information in its
possession requested by Pfizer as to the foregoing in the written requests
identified in the letter from Larry Miller to Harsha Murthy dated December 17,
2002. Except with respect to patents and patent applications subject to the Isis
License, Gilead License and Shearwater License listed on Exhibit 1.18, Eyetech
is the legal and beneficial owner of all the Eyetech Patent Rights and all of
the Eyetech Technical Information, and, except as set forth in Exhibit 8.1(i),
no other person, firm, corporation or other entity has any right, interest or
claim in or to, and Eyetech has not entered into any agreement granting any
right, interest or claim in or to, the Eyetech Patent Rights or Eyetech
Technical Information; provided that Eyetech gives no representation or warranty
as to whether any third party has independently developed rights to scientific
or technical information or related know-how or trade secrets. Except with
respect to patents and patent applications licensed to Eyetech under the
MEEI/Draper License, Exhibit 1.18 is a complete and correct list of all patents
and patent applications in the Territory owned by or licensed to Eyetech or any
of its Subsidiaries (and indicating which are owned and which are licensed)
relating to the

                                       39
<PAGE>

manufacture, use, sale, offer for sale or importation of the Compound or any
Product. Except with respect to the matters set forth in (x) the letter from
Harsha Murthy to Larry Miller dated December 17, 2002 and (y) Exhibit 8.1(i), to
the best of Eyetech's knowledge, Eyetech or its Subsidiaries own or possess
adequate licenses or other valid rights to use all patents, patent rights and
know-how (collectively, "Intellectual Property") necessary to manufacture the
Compound described in Exhibit 1.8 and the Product being used by Eyetech in
clinical trials as of the Execution Date in the Territory and to distribute, use
and sell such Compound and such Product in the Territory, all free of any lien,
encumbrance, liability or other restriction.

                  (b)      Eyetech has disclosed to Pfizer all material
information known to Eyetech relating to: (i) the drug quality, including
stability, variability, impurities and delivery performance in each case
relating to the Product, and (ii) changes made by Eyetech or its Affiliates
after the initiation of Phase III Clinical Studies for the Products relating to
formulation, packaging and method of manufacture and formulation and to
processing parameters, and (iii) the status of discussions with FDA or any
Governmental Authorities directly relating thereto, and (iv) clinical trial site
and contract research organization compliance with all provisions of the Act
governing clinical investigations, and (v) the safety and efficacy of the
Products.

                  (c)      Eyetech has the corporate power and authority to
execute and deliver this Agreement and the Collaboration Agreement and to
perform its obligations hereunder and thereunder, and the execution, delivery
and performance of this Agreement and the Collaboration Agreement by Eyetech
have been duly and validly authorized and approved by proper corporate action on
the part of Eyetech, and Eyetech has taken all other action required by Law, its
certificate of incorporation or by-laws or any agreement to which it is a party
or by which it or its assets are bound required to authorize such execution,
delivery and (subject to obtaining all

                                       40
<PAGE>

necessary governmental approvals with respect to the manufacture, use, sale,
offer for sale or importation of Products and subject to any necessary HSR
Clearance) performance. Assuming due authorization, execution and delivery on
the part of Pfizer, each of this Agreement and the Collaboration Agreement
constitutes a legal, valid and binding obligation of Eyetech, enforceable
against Eyetech in accordance with its respective terms.

                  (d)      The execution and delivery of this Agreement and the
Collaboration Agreement by Eyetech and the performance by Eyetech contemplated
hereunder and thereunder will not violate (subject to obtaining all necessary
governmental approvals with respect to the manufacture, use, sale, offer for
sale or importation of Products and subject to obtaining any necessary HSR
Clearance) any ordinance, Law, decree or government regulation or any order of
any court or other governmental department, authority, agency or instrumentality
therein.

                  (e)      Neither the execution and delivery of this Agreement
or the Collaboration Agreement nor the performance hereof or thereof by Eyetech
requires Eyetech to obtain any permits, authorizations or consents from any
governmental body (subject to obtaining all necessary governmental approvals
with respect to the manufacture, use, sale, offer for sale or importation of
Products and subject to obtaining any necessary HSR Clearance) or from any other
person, firm or corporation, and such execution, delivery and performance will
not result in the breach of or give rise to any termination of any agreement or
contract to which Eyetech may be a party which relates to the Eyetech Patent
Rights, Eyetech Technical Information, the Compound or the Products.

                  (f)      Except for the matters referred to in Exhibit 8.1(f),
there is no action, claim, demand, suit, proceeding, arbitration, grievance,
citation, summons, subpoena, inquiry or investigation of any nature, civil,
criminal, regulatory or otherwise, in law or in equity, pending

                                       41
<PAGE>

or, to the best knowledge of Eyetech, threatened against Eyetech or its
Affiliates in connection with the Compound, the Product or any Eyetech Patent
Rights or against or relating to the transactions contemplated by this Agreement
or the Collaboration Agreement. To the best knowledge of Eyetech, except for the
matters referred to in Exhibit 8.1(f), there is no action, claim, demand, suit,
proceeding, arbitration, grievance, citation, summons, subpoena, inquiry or
investigation of any nature, civil, criminal, regulatory or otherwise, in law or
in equity, pending or threatened against, Isis, Gilead, Shearwater or any of
their respective Affiliates in connection with the Compound, the Product or any
Eyetech Patent Rights or against or relating to the transactions contemplated by
this Agreement or the Collaboration Agreement.

                  (g)      The Gilead License as heretofore delivered by Eyetech
to Pfizer represents the complete agreement and understanding between Gilead and
Eyetech relating to the Eyetech Patent Rights and Eyetech Technical Information
which are the subject of the Gilead License. The Isis License as heretofore
delivered by Eyetech to Pfizer represents the complete agreement and
understanding between Isis and Eyetech relating to the Eyetech Patent Rights and
Eyetech Technical Information which are the subject of the Isis License. The
Shearwater License as heretofore delivered by Eyetech to Pfizer represents the
complete agreement and understanding between Shearwater and Eyetech relating to
the Eyetech Patent Rights and Eyetech Technical Information which are the
subject of the Shearwater License. None of the Gilead License, Isis License or
Shearwater License has been modified, supplemented or amended, other than by
amendments thereto provided to Pfizer prior to the Execution Date. Except for
the Gilead License, the Isis License and the Shearwater License, there are no
agreements to which Eyetech or any of its Affiliates is a party pursuant to
which Eyetech or any of its Affiliates has a license, or an option to obtain a
license, or holds an immunity from suit, with respect to patents which (i)

                                       42
<PAGE>

are pending, applied for, granted or registered, and (ii) but for Eyetech's
rights under such agreements, could be asserted by third parties to be infringed
by the distribution, use, or sale of the Compound, or the Product being used by
Eyetech in clinical trials as of the Execution Date, in the Territory. Eyetech
has previously delivered to Pfizer all of its agreements with any third parties
regarding supply and manufacture of all goods and services relating to the
Compound and the Product being used by Eyetech in clinical trials as of the
Execution Date (the "Supply Agreements"), none of which have been modified,
supplemented or amended.

                  (h)      Each of the Gilead License, Isis License and
Shearwater License is in full force and effect, all payments to date required to
be made thereunder by Eyetech have been made, and Eyetech is in compliance in
all material respects with its respective obligations thereunder.

                  (i)      Exhibit 8.1(i) sets forth all sources of funding,
grants or loans Eyetech has received and, to Eyetech's knowledge, that Gilead or
NeXstar Pharmaceuticals, Inc. has received, in connection with the discovery,
research and development of the Compound and any Product.

                  (j)      Exhibit 8.1(j) sets forth a list of (i) all
pre-clinical and clinical studies of the Compound, together with the dates and
brief descriptions of such studies, previously or currently undertaken or
sponsored by Eyetech or its Affiliates and by any third-party investigator under
any contract with Eyetech, data and reports relating to which have been
previously provided to Pfizer and (ii) material correspondence and contact
information with the FDA and other Regulatory Authorities regarding the Compound
and the Products, copies of which have been previously provided to Pfizer.

                                       43
<PAGE>

                  (k)      No person owns 50% or more of the voting securities
of Eyetech. Eyetech has no subsidiaries other than those whose financial
statements are maintained on a consolidated basis with those of Eyetech.

         8.2      Pfizer Representations and Warranties.

         Pfizer hereby represents and warrants, as of the date hereof, to
Eyetech as follows:

                  (a)      Pfizer has the corporate power and authority to
execute and deliver this Agreement and the Collaboration Agreement and to
perform its obligations hereunder and thereunder, and the execution, delivery
and performance of this Agreement and the Collaboration Agreement by Pfizer have
been duly and validly authorized and approved by proper corporate action on the
part of Pfizer, and Pfizer has taken all other action required by Law, its
certificate of incorporation or by-laws or any agreement to which it is a party
or by which it or its assets are bound required to authorize such execution,
delivery and (subject to obtaining all necessary governmental approvals with
respect to the manufacture, use, sale, offer for sale or importation of Products
and subject to any necessary HSR Clearance) performance. Assuming due
authorization, execution and delivery on the part of Eyetech, each of this
Agreement and the Collaboration Agreement constitutes a legal, valid and binding
obligation of Pfizer, enforceable against Pfizer in accordance with its
respective terms.

                  (b)      The execution and delivery of this Agreement and the
Collaboration Agreement and the performance by Pfizer contemplated hereunder and
thereunder will not violate (subject to obtaining appropriate governmental
health, pricing and reimbursement approvals) any state, federal or other statute
or regulation or any order of any court or other governmental department,
authority, agency or instrumentality therein.

                                       44
<PAGE>

                  (c)      There is no action, claim, demand, suit, proceeding,
arbitration, grievance, citation, summons, subpoena, inquiry or investigation of
any nature, civil, criminal, regulatory or otherwise, in law or in equity,
pending or relating to or, to the knowledge of Pfizer, threatened against Pfizer
in connection with or relating to the transactions contemplated by this
Agreement or the Collaboration Agreement, and assuming the accuracy of the
representations and warranties of Eyetech contained herein, Pfizer is unaware
and has no reason to be aware of any basis for the foregoing.

                  (d)      Neither the execution and delivery of this Agreement
or the Collaboration Agreement nor the performance hereof or thereof by Pfizer
requires Pfizer to obtain any permits, authorizations or consents from any
governmental body (subject to obtaining all necessary governmental approvals
with respect to the manufacture, use, sale, offer for sale or importation of the
Product and subject to obtaining any necessary HSR Clearance) or from any other
person, firm or corporation and such execution, delivery and performance will
not result in the breach of or give rise to any termination of any agreement or
contract to which Pfizer may be a party, except that would not reasonably be
expected to adversely affect the ability of Pfizer to perform its obligations
under this Agreement.

         8.3      Eyetech Covenants.

         Eyetech covenants and agrees as follows:

                  (a)      As soon as practicable after the date hereof, Eyetech
will provide Pfizer with accurate, complete and final versions of all reports
and studies previously submitted to Pfizer to the extent not previously
provided, together with access to any related data and files, and to principal
investigators and such persons participating in the studies.

                                       45
<PAGE>

                  (b)      Subject to Pfizer's and its sublicensees' performance
of their obligations under this Agreement and the Collaboration Agreement
(including such obligations relating to third party royalties), Eyetech shall
use commercially reasonable efforts to maintain the Isis License, Gilead License
and Shearwater License in good standing and not to take any actions (or omit or
fail to take any actions) which would result in a breach of any of such license
agreements. Eyetech agrees that it shall not amend, modify or supplement any of
the Isis License, Gilead License or Shearwater License in any manner that would
adversely affect Pfizer's rights under this Agreement or the Collaboration
Agreement without the consent of Pfizer. In addition, Eyetech shall not sell,
assign, convey, pledge, hypothecate or otherwise transfer any of the Isis
License, Gilead License or Shearwater License or Eyetech's rights or obligations
thereunder, or otherwise make any commitments or offers in a manner that
conflicts with Pfizer's rights hereunder without the consent of Pfizer. Eyetech
shall immediately notify Pfizer upon receipt by Eyetech or its Affiliates of any
notice from Gilead, Isis or Shearwater of such party's intent to terminate
Eyetech's rights, exercise its respective rights or remedies thereunder, or
otherwise take any action that may adversely affect Pfizer's rights under this
Agreement.

         8.4      No Consequential or Punitive Damages.

                  (a)      NEITHER PARTY HERETO WILL BE LIABLE FOR INDIRECT,
INCIDENTAL, CONSEQUENTIAL, SPECIAL, EXEMPLARY OR PUNITIVE DAMAGES ARISING FROM
OR RELATING TO ANY BREACH OF THIS AGREEMENT, OR FOR LOST PROFITS ARISING FROM OR
RELATING TO ANY BREACH OF THIS AGREEMENT, REGARDLESS OF ANY NOTICE OF SUCH
DAMAGES. NOTHING IN THIS SECTION 8.4 IS INTENDED TO LIMIT OR RESTRICT THE
INDEMNIFICATION

                                       46
<PAGE>

RIGHTS OR OBLIGATIONS OF EITHER PARTY UNDER THIS AGREEMENT WITH RESPECT TO THIRD
PARTY CLAIMS.

                  (b)      Notwithstanding anything to the contrary contained in
this Agreement, in the case of any claim by any party alleging any breach of
this Agreement by the other party, any payment obligation pursuant to Articles 3
and 4 of this Agreement (the "Payment Obligations"), will not be considered as
constituting special, incidental, indirect or consequential damages under this
Agreement (and, accordingly, nothing in Section 8.4(a) shall prevent recovery or
inclusion in the definition of "Losses").

                                    ARTICLE 9

                                      TERM

         9.1      This Agreement shall be effective as of the date first set
forth above and shall remain in effect for the Term.

                                   ARTICLE 10

                                   TERMINATION

         10.1     Termination for Convenience. This Agreement shall terminate:
(a) upon (i) twelve (12) months prior written notice from Pfizer of termination
of this Agreement, if such notice is given prior to the first Launch of a
Product in the Territory, (ii) nine (9) months prior written notice from Pfizer
of termination of this Agreement, if such notice is given prior to the fifth
anniversary of the first Launch of a Product in the Territory or (iii) six (6)
months prior written notice from Pfizer of termination of this Agreement, if
such notice is given after the fifth anniversary of the first Launch of a
Product in the Territory, in each case which notice Pfizer shall be entitled to
submit in its absolute and sole discretion; and (b) at Eyetech's sole option,
exercisable by giving written notice of termination to Pfizer, following
termination or expiration

                                       47
<PAGE>

of the Collaboration Agreement as provided in Sections 13.1, 13.2(b), 13.4,
13.5, 13.6, 13.8 and 17.11 of the Collaboration Agreement.

         10.2     Termination for Breach. Eyetech shall have the rights set
forth below in this Section 10.2 by notice to Pfizer, and Pfizer shall have the
rights set forth below in this Section 10.2 by notice to Eyetech.

                  (a)      Upon Eyetech's notice to Pfizer that a Material
Default by Pfizer has occurred, the Parties will meet to discuss in good faith
whether a plan to remedy the Material Default can be mutually agreed. If the
Parties fail to so agree within thirty (30) days after the date of such notice,
Section 10.2(b) below shall apply. Notwithstanding the foregoing provisions of
this Section 10.2(a), in the case of a payment default, the provisions of
Section 10.2(b) below shall apply without any obligation to meet to discuss
remedies pursuant to this Section 10.2(a).

                  (b)      Subject to the terms hereof, upon the occurrence of
any Material Default by Pfizer, Eyetech may, upon ninety (90) days prior written
notice, terminate this Agreement. Eyetech may give the notice specified in this
Section 10.2(b) concurrently with the notice specified in Section 10.2(a) and
shall not give the notice specified in this Section 10.2(b) later than sixty
(60) days after the date of the notice specified in Section 10.2(a).

                  (c)      Upon Pfizer's notice to Eyetech that a Material
Default by Eyetech has occurred, the Parties will meet to discuss in good faith
whether a plan to remedy the Material Default can be mutually agreed. If the
Parties fail to so agree within thirty (30) days after the date of such notice,
Section 10.2(d) below will apply. Notwithstanding the foregoing provisions of
this Section 10.2(c), in the case of a payment default, the provisions of
Section 10.2(d) below shall apply without any obligation to meet to discuss
remedies pursuant to this Section 10.2(c).

                                       48
<PAGE>

                  (d)      Subject to the terms hereof, upon the occurrence of
any Material Default by Eyetech, Pfizer may, upon ninety (90) days prior notice,
terminate this Agreement. Pfizer may give the notice specified in this Section
10.2(d) concurrently with the notice specified in Section 10.2(c) and shall not
give the notice specified in this Section 10.2(d) later than sixty (60) days
after the date of the notice specified in Section 10.2(c).

                  (e)      "Material Default" means:

                           (i)      any default by any Party hereto of its
covenants, agreements or other performance obligations under this Agreement or
the Collaboration Agreement other than a payment default (which may include any
one or more defaults of any specific covenant, agreement or other performance
obligations contained herein) that, when aggregated with any other such uncured
defaults by such Party, is (a) material to this Agreement and the Collaboration
Agreement taken as a whole, and (b) shall have continued for thirty (30) days
after written notice thereof was provided to the alleged defaulting Party by the
non-defaulting Party (or, if such default cannot be cured within such thirty
(30) day period, if the alleged defaulting Party does not promptly commence and
diligently continue all reasonable actions to cure such defaults during such
thirty (30) day period or does not cure in full such default within sixty (60)
days after written notice thereof was provided to the alleged defaulting Party);
or

                           (ii)     any default by any Party hereto of its
payment obligations hereunder that shall have continued for fifteen (15) days
after written notice thereof was provided to the alleged defaulting Party by the
non-defaulting Party; provided that, in the event of a good faith payment
dispute, such fifteen (15) day cure period shall be extended through the
fifteenth day following the date on which such dispute is resolved if the
alleged defaulting Party paid all undisputed amounts when due and provided the
non-defaulting Party with a reasonably

                                       49
<PAGE>

detailed written explanation of the alleged defaulting Party's basis for
disputing the payment obligation within the fifteen (15) day period following
the written notice of the default by the non-defaulting Party.

         10.3     Breach of Non-Competition Obligations. If a Party breaches its
obligations under Section 10.5, the other Party may terminate this Agreement
upon thirty (30) days prior written notice of termination to the breaching
Party; provided that, if the breaching Party permanently ceases the activity or
eliminates the condition, as applicable, giving rise to the breach of its
obligations under Section 10.5 prior to the expiration of such thirty (30) day
notice period, such termination shall not take effect.

         10.4     Effects of Termination. In the event that this Agreement is
terminated in accordance with Section 10.1 or 10.2:

                  (a)      the licenses set forth in Sections 2.1 and 2.2 shall
terminate;

                  (b)      Eyetech's right to receive all payments due and owing
under Articles 3 and 4 hereof as of the effective date of such termination shall
survive;

                  (c)      each Party's right to recover against the other Party
for any breaches of any representations, warranties, covenants and agreements of
such other Party under this Agreement as of the effective date of such
termination shall survive;

                  (d)      the provisions of Articles 5 and 11, Section 6.2 and
this Section 10.4 shall survive the expiration or termination of this Agreement
in accordance with their terms;

                  (e)      Pfizer shall promptly and in no event later than
sixty (60) days after termination or expiration (i) transfer to Eyetech
ownership of all governmental or regulatory filings and approvals (including all
INDs and NDAs (and their foreign equivalents)) relating to Products, (ii)
deliver to Eyetech all pre-clinical and clinical data and information in
Pfizer's

                                       50
<PAGE>

possession or control relating to the Products, (iii) deliver to Eyetech copies
of all reports, records, regulatory correspondence and other materials in
Pfizer's possession or control relating to the pre-clinical and clinical
development, regulatory approval, manufacture, distribution and sales of
Products, including without limitation all information contained in the
centralized global safety database established and maintained by Pfizer in
accordance with the Regulatory Services Agreement, and (iv) deliver to Eyetech
all data and information relating to process conditions, in-process controls,
analytical methodology and formulation, in each case as developed by Pfizer and
relating to the manufacturing of Products, solely for use in connection with the
Products;

                  (f)      Pfizer shall grant to Eyetech a non-exclusive,
non-royalty-bearing, perpetual right and license under Pfizer's and its
Affiliates' rights in Collaboration Intellectual Property to develop, make, have
made, use, sell, offer for sale, import, and have imported Products in the
Territory;

                  (g)      if Pfizer has taken over responsibility for
contracting with API Bulk Drug Substance Supplier(s) and/or Fill and Finish
Services Supplier(s), or for performing, either directly or through Affiliates,
services that otherwise would be performed by API Bulk Drug Substance
Supplier(s) and/or Fill and Finish Services Supplier(s), Pfizer shall continue
to manufacture or have manufactured (including filling and finishing) Product
being manufactured by Pfizer and/or its Affiliates, on the terms and conditions
in effect immediately prior to termination, for worldwide supply to Eyetech
during the shorter of (i) the twenty-four (24) month period following
termination and (ii) the period following termination and prior to Eyetech's
establishment of its own manufacturing capabilities and/or third party
manufacturing and supply arrangements with respect to the Products; and Pfizer
shall cooperate with Eyetech during such period to assign to Eyetech all third
party manufacturing and supply (including fill

                                       51
<PAGE>

and finish services) agreements and transfer to Eyetech all manufacturing
know-how, and to provide Eyetech with such other assistance as may be requested
by Eyetech, reasonably required by Eyetech for the purpose of establishing its
own manufacturing capabilities and/or third party manufacturing and supply
arrangements with respect to the Products;

                  (h)      Pfizer shall permit Eyetech, at Eyetech's option, to
purchase, at Manufacturing Cost, all or any part of Pfizer's worldwide unsold
inventory of raw materials for Products, work-in-progress Products and finished
Products as of the effective date of termination, provided that, Pfizer shall
not be required to sell to Eyetech inventories of raw materials for Products and
work-in-progress Products that Pfizer needs to satisfy its obligations under
Section 10.4(g); and

                  (i)      unless this Agreement expressly provides that
termination shall be the sole and exclusive remedy for a particular breach
hereof, either Party's right to commence an action, suit or other proceeding
claiming breach of this Agreement by the other Party shall survive termination.

         Upon any termination of this Agreement, each Party shall promptly
return to the other Party all written Confidential Information, and all copies
thereof, of such other Party.

         10.5     Non-Competition. During the Term and Co-Promotion Term (as
defined in the Collaboration Agreement), neither Pfizer nor Eyetech nor any of
their Affiliates shall, directly or indirectly, manufacture commercial
quantities of, or market, sell, detail or promote, any Competing Product in the
Territory (excluding the EU), except for the Products as provided in this
Agreement and in the Collaboration Agreement. If (a) either Party terminates the
Collaboration Agreement pursuant to Section 13.2, 13.4 or 13.5 of the
Collaboration Agreement or (b) Pfizer terminates this Agreement pursuant to
Section 10.1 of this Agreement, then the

                                       52
<PAGE>

prohibition set forth in the immediately preceding sentence shall, in the case
of a termination described in clause (a) of this sentence, be extended with
respect to the other Party and its Affiliates through a period immediately
following the effective date of such termination of:

                           (i)      [**], if such termination occurs [**],

                           (ii)     [**], if such termination occurs [**], or

                           (iii)    [**], if such termination occurs [**],

and, in the case of a termination described in clause (b) of this sentence, be
extended with respect to Pfizer and its Affiliates through a period immediately
following the effective date of such termination of:

                           (i)      [**], if such termination occurs [**],

                           (ii)     [**], if such termination occurs [**], or

                           (iii)    [**], if such termination occurs [**].

Notwithstanding the foregoing, Eyetech and its Affiliates, either directly or in
collaboration with third parties, shall be entitled to commercialize products
that contain or are based on the Compound for use outside the Field ("POF"),
provided such products are sold under product trademarks other than the
Trademark(s) and are: (a) in a different dosage strength; (b) in a different
formulation; or (c) with a different delivery system; in each case not intended
or developed for use in the Field. Eyetech and its Affiliates shall not conduct
clinical trials or marketing studies with respect to such POF to support use of
such POF in the Field, and Eyetech and its Affiliates shall require any third
party collaborator to comply with this undertaking with respect to any POF.
Subject to the provisions of Section 10.6, any breach of this Section 10.5 shall
entitle the non-breaching Party to terminate this Agreement pursuant to Section
10.3.

                                       53
<PAGE>

         10.6     Acquisitions Involving Competing Products. Notwithstanding the
provisions of Section 10.5 above, if during the Term Pfizer or Eyetech or any of
their respective Affiliates acquires or agrees to acquire a Competing Product in
the Territory through acquisition of or merger with a company or entity, or is
acquired or agrees to be acquired by a company or entity that owns a Competing
Product in the Territory, Pfizer or Eyetech, as applicable, shall have thirty
(30) days from the date of public announcement of the acquisition or merger to
notify the other Party as to whether Pfizer or Eyetech or the acquiring company
or entity, as applicable, intends to divest its interest in such Competing
Product. In the event that Pfizer or Eyetech or the acquiring company or entity,
as applicable, elects to divest its interest in such Competing Product, such
Party or the acquiring company or entity shall use reasonable efforts to
identify a third party purchaser to whom such Party or the acquiring company or
entity will divest its interest in such Competing Product and to enter into a
definitive agreement with such third party for such divestiture as soon as
reasonably practicable under the circumstances. If Pfizer or Eyetech or the
acquiring company or entity, as applicable, elects not to divest its interest in
such Competing Product or fails to divest its interest in such Competing Product
within [**] after the closing of the transaction for which Pfizer or Eyetech, as
applicable, has provided the other Party with notice, then the other Party shall
have the option, upon written notice to Pfizer or Eyetech, as applicable, given
no later than ninety (90) days after the earlier of: (i) Pfizer's or Eyetech's
written notice, as applicable, of its election not to divest such Competing
Product; and (ii) the end of such [**] period described above, to terminate this
Agreement pursuant to Section 10.5, treating such election not to divest or
failure to divest such Competing Product as a breach of Section 10.5.
Notwithstanding the provisions of Section 10.5 and this Section 10.6, however,
neither Party shall have the right to terminate this Agreement based on the
other Party's or its

                                       54
<PAGE>

Affiliate's or acquiring company's or entity's failure to divest its interest in
a Competing Product that is sold only in the EU.

         10.7     Competing Products in the EU. Notwithstanding the provisions
of Sections 10.5 and 10.6 above, (a) if Pfizer or any of its Affiliates,
directly or indirectly, manufactures commercial quantities of, or markets,
sells, details or promotes, any Competing Product in the EU, the licenses
granted by Eyetech to Pfizer in Section 2.1(a) shall at Eyetech's option, which
option shall be exercisable upon notice by Eyetech to Pfizer, convert to
nonexclusive licenses, and (b) if Eyetech or any of its Affiliates, directly or
indirectly, manufactures commercial quantities of, or markets, sells, details or
promotes, any Competing Product in the EU, then with respect to any given Net
Sales of Products in the EU, subject to the limitations set forth in Section
4.1(c), the royalties set forth in Section 4.1(a) or 4.1(b) shall thereafter be
reduced by [**] percent ([**]%).

                                   ARTICLE 11

                               DISPUTE RESOLUTION

         11.1     Arbitration. Any payment dispute or dispute arising out of any
audit conducted pursuant to Section 5.5 shall be resolved through binding
arbitration as follows:

                  (a)      A Party may submit such dispute to arbitration by
notifying the other Party, in writing, of such dispute. Within thirty (30) days
after receipt of such notice, the Parties shall designate in writing a single
arbitrator to resolve the dispute; provided, however, that if the Parties cannot
agree on an arbitrator within such 30-day period, the arbitrator shall be
selected by the New York, New York office of the American Arbitration
Association (the "AAA"). The arbitrator shall be a lawyer knowledgeable and
experienced in the law concerning the subject

                                       55
<PAGE>

matter of the dispute, and shall not be an Affiliate, employee, consultant,
officer, director or stockholder of any Party.

                  (b)      Within thirty (30) days after the designation of the
arbitrator, the arbitrator and the Parties shall meet, at which time the Parties
shall be required to set forth in writing all disputed issues and a proposed
ruling on the merits of each such issue.

                  (c)      The arbitrator shall set a date for a hearing, which
shall be no later than thirty (30) days after the submission of written
proposals pursuant to Section 11.1(b), to discuss each of the issues identified
by the Parties. The Parties shall have the right to be represented by counsel.
Except as provided herein, the arbitration shall be governed by the Commercial
Arbitration Rules of the AAA; provided, however, that the Federal Rules of
Evidence shall apply with regard to the admissibility of evidence.

                  (d)      The arbitrator shall use his or her best efforts to
rule on each disputed issue within thirty (30) days after the completion of the
hearings described in Section 11.1(c). The determination of the arbitrator as to
the resolution of any dispute shall be binding and conclusive upon all Parties.
All rulings of the arbitrator shall be in writing and shall be delivered to the
Parties.

                  (e)      The (i) attorneys' fees of the Parties in any
arbitration, (ii) fees of the arbitrator and (iii) costs and expenses of the
arbitration shall be borne by the Parties as determined by the arbitrator.

                  (f)      Any arbitration pursuant to this Section 11.1 shall
be conducted in New York, New York. Any arbitration award may be entered in and
enforced by a court in accordance with Section 12.4.

                                       56
<PAGE>

         11.2     No Limitation. Nothing in Section 11.1 shall be construed as
limiting in any way the right of a Party to seek a temporary restraining order
or preliminary injunction with respect to any actual or threatened breach of
this Agreement from, or to bring an action in aid of arbitration in, a court in
accordance with Section 12.4. Should any Party seek a temporary restraining
order or preliminary injunction, then for purposes of determining whether to
grant such temporary restraining order or preliminary injunction, the dispute
underlying the request for such temporary restraining order or preliminary
injunction may be heard by a court in accordance with Section 12.4.

                                   ARTICLE 12

                                  MISCELLANEOUS

         12.1     Force Majeure. No Party shall be liable for failure of or
delay in performing obligations set forth in this Agreement, and no Party shall
be deemed in breach of its obligations, if such failure or delay is due to
natural disasters or any causes reasonably beyond the control of such Party.

         12.2     Assignment. Except as otherwise provided herein, neither this
Agreement nor any of the rights or obligations hereunder may be assigned by
either Party without the prior consent of the other Party, except assignment, in
whole or in part, to an Affiliate of the assigning Party so long as such
Affiliate agrees in writing to be bound by the terms of this Agreement. The
assigning Party shall remain primarily liable hereunder notwithstanding any such
assignment. Any attempted assignment in violation hereof shall be void.

         12.3     Governing Law. This Agreement shall be governed by the laws of
the State of New York without regard to its conflict of laws provisions.

                                       57
<PAGE>

         12.4     Jurisdiction. Except with respect to disputes arising out of
audits conducted pursuant to Section 5.5 or with respect to payment disputes,
which shall be resolved through binding arbitration in accordance with Article
11, each Party (a) irrevocably submits to the exclusive jurisdiction in the
United States District Court for the Southern District of New York and any State
courts sitting in New York, New York (collectively, the "Courts"), for purposes
of any action, suit or other proceeding arising out of this Agreement, and (b)
agrees not to raise any objection at any time to the laying or maintaining of
the venue of any such action, suit or proceeding in any of the Courts,
irrevocably waives any claim that such action, suit or other proceeding has been
brought in an inconvenient forum and further irrevocably waives the right to
object, with respect to such action, suit or other proceeding, that such Court
does not have any jurisdiction over such Party.

         12.5     Notices. All notices, instructions and other communications
hereunder or in connection herewith shall be in writing, shall be sent to the
address below and shall be: (a) delivered personally; (b) sent by registered or
certified mail, return receipt requested, postage prepaid; (c) sent via a
reputable nationwide overnight courier service; or (d) sent by facsimile
transmission. Any such notice, instruction or communication shall be deemed to
have been delivered upon receipt if delivered by hand, three (3) Business Days
after it is sent by registered or certified mail, return receipt requested,
postage prepaid, one (1) Business Day after it is sent via a reputable
nationwide overnight courier service, or when transmitted with electronic
confirmation of receipt, if transmitted by facsimile (if such transmission is on
a Business Day; otherwise, on the next Business Day following such
transmission). Notices shall be addressed as follows:

                                       58
<PAGE>

If to Pfizer:                                 If to Eyetech:

PFIZER INC.                                   EYETECH PHARMACEUTICALS, INC.
235 East 42nd Street                          500 Seventh Avenue, 18th Floor
New York, New York 10017-5755                 New York, New York  10018

Fax: 212-808-8652                             Fax: 212-997-9251

Attention: President, Pfizer Pharmaceutical   Attention: Chief Executive Officer
           Group

with a copy to:                               with a copy to:

PFIZER INC.                                   Hale and Dorr LLP
235 East 42nd Street                          60 State Street
New York, New York 10017-5703                 Boston, Massachusetts 02109
Attn.: Senior Vice President and General      Attn.: David E. Redlick, Esq.
       Counsel

Fax: 212-808-8924                             Fax: 617-526-5000

Either Party may change its address by giving notice to the other Party in the
manner provided above.

         12.6     Entire Agreements; Amendments. This Agreement, together with
the Collaboration Agreement and the other Other Product-Related Agreements, sets
forth the complete understanding of the Parties with respect to the Parties'
joint development and commercialization of Products and supersedes all prior
understandings and writings relating to such subject matter. None of the terms
or this Agreement shall be amended, supplemented or modified except in writing
signed by the Parties hereto. The Parties understand and agree that each of this
Agreement and the Collaboration Agreement are considered to be a single
integrated agreement and contain intellectual property rights and licenses
relating to the Products for which Pfizer has bargained and paid consideration.
If any applicable court of competent jurisdiction determines this Agreement or
the Collaboration Agreement to be executory in nature, such agreements shall
otherwise be deemed to be, for purposes of Section 365 (n) of the Bankruptcy

                                       59
<PAGE>

Code, licenses of rights to "intellectual property" as defined under Section 101
of the Bankruptcy Code.

         12.7     Severability. If and solely to the extent that any provision
of this Agreement shall be invalid or unenforceable, or shall render this entire
Agreement to be unenforceable or invalid, such offending provision shall be of
no effect and shall not effect the validity of the remainder of this Agreement
or any of its provisions; provided, however, the Parties shall use their
respective reasonable efforts to renegotiate the offending provisions to best
accomplish the original intentions of the Parties.

         12.8     Waivers. Any term or condition of this Agreement may be waived
at any time by the Party that is entitled to the benefit thereof, but no such
waiver shall be effective unless set forth in a written instrument duly executed
by or on behalf of the Party or Parties waiving such term or condition. Neither
the waiver by any Party of any term or condition of this Agreement nor the
failure on the part of any Party, on one or more instances, to enforce any of
the provisions of this Agreement or to exercise any right or privilege, shall be
deemed or construed to be a waiver of such term or condition for any similar
instance in the future or of any subsequent breach hereof. All rights, remedies,
undertakings, obligations and agreements contained in this Agreement shall be
cumulative and none of them shall be a limitation of any other remedy, right,
undertaking, obligation or agreement.

         12.9     Binding Effect. This Agreement shall be binding upon and inure
to the benefit of the Parties hereto and their respective permitted successors
and assigns.

         12.10    Further Assurances. Following the date hereof, Eyetech and
Pfizer shall and, to the extent this Agreement expressly imposes obligations on
its Affiliates, each Party shall cause each of its respective Affiliates to,
from time to time, execute and deliver such additional

                                       60
<PAGE>

instruments, documents, conveyances or assurances and take such other actions as
shall be necessary or otherwise reasonably requested by Pfizer or Eyetech, to
confirm and assure the rights and obligations provided for in this Agreement,
and render effective the consummation of the transactions contemplated thereby.

         12.11 Third Party Beneficiaries. None of the provisions of this
Agreement shall be for the benefit of or enforceable by any third party
including, without limitation, any creditor of either Party. No third party
shall obtain any right under any provision of this Agreement or shall by reasons
of any such provision make any claim in respect of any debt, liability or
obligation (or otherwise) against either Party hereto.

         12.12 Performance by Subsidiaries and Affiliates. To the extent that
this Agreement imposes obligations on Subsidiaries and Affiliates of a Party,
such Party agrees to cause its Subsidiaries and Affiliates to perform such
obligations.

         12.13 Counterparts. This Agreement may be executed in any two or more
counterparts, each of which, when executed, shall be deemed to be an original
and all of which together shall constitute one and the same document.

         12.14 Headings. Headings in this Agreement are included herein to ease
of reference only and shall have no legal effect. References to Sections and
Exhibits are to Sections and Exhibits of this Agreement unless otherwise
specified.

                                       61

<PAGE>

         12.15 Offset. All amounts due and payable from Pfizer to Eyetech
pursuant to this Agreement are subject to offset in respect of the amount of any
liabilities of Eyetech paid by Pfizer to Gilead pursuant to Section 3 of the
Stand-By License Agreement between Pfizer and Gilead dated December 13, 2002.

         IN WITNESS WHEREOF, the Parties hereto have caused this Agreement to be
executed as of the date first written above by their duly authorized officers.

PFIZER INC.                               EYETECH PHARMACEUTICALS, INC.

By:    /s/ Henry A. McKinnell             By:    /s/ David R. Guyer
       __________________________                __________________________

Name:  Henry A. McKinnell                 Name:  David R. Guyer
       __________________________                __________________________

Title: Chairman and CEO                   Title: CEO
       __________________________                __________________________
                                       62

<PAGE>

                                   EXHIBIT 1.8

                                    COMPOUND

[**]

                                       63

<PAGE>

                                  EXHIBIT 1.18

                              EYETECH PATENT RIGHTS

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                                       64

<PAGE>

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</TABLE>

                                       65

<PAGE>

<TABLE>
<CAPTION>
---------------------------------------------------------------------------------------------------------------
                  APPLICATION                                                        PATENT
COUNTRY              NUMBER            FILING DATE          STATUS                   NUMBER          ISSUE DATE
---------------------------------------------------------------------------------------------------------------
<S>               <C>                  <C>                  <C>                      <C>             <C>
 [**]                [**]                                    [**]
 -------------------------------------------------------------------------------------------------------------
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</TABLE>

                                       66

<PAGE>

<TABLE>
<CAPTION>
---------------------------------------------------------------------------------------------------------------
                  APPLICATION                                                        PATENT
COUNTRY              NUMBER            FILING DATE          STATUS                   NUMBER          ISSUE DATE
---------------------------------------------------------------------------------------------------------------
<S>               <C>                  <C>                  <C>                      <C>             <C>
 [**]                                                        [**]
 -------------------------------------------------------------------------------------------------------------
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</TABLE>

                                       67

<PAGE>

                                 EXHIBIT 8.1(f)

                      CERTAIN INTELLECTUAL PROPERTY MATTERS

[**] which were previously disclosed to Pfizer.

                                       68

<PAGE>

                                 EXHIBIT 8.1(i)

                                 FUNDING SOURCES

With respect to Eyetech, other than general corporate funding, Eyetech has not
received any funding, grants or loans in connection with the discovery, research
and development of the Compound or any Product.

To Eyetech's knowledge, with respect to Gilead or NeXstar Pharmaceuticals, other
than general corporate funding received by Gilead or NeXstar Pharmaceuticals,
neither Gilead nor NeXstar Pharmaceuticals has received any funding, grants or
loans in connection with the discovery, research and development of the Compound
or any Product.

To Eyetech's knowledge, the following Patent Rights were supported by grants
[**]. As a result, the Parties are subject to the provisions of Law referenced
in Section 2.1(f) of this Agreement.

                                       69

<PAGE>

                                 EXHIBIT 8.1(j)

                                     STUDIES

8.1(j)(i): (A) The following is a list of all pre-clinical and clinical studies
of the Compound, together with the dates and brief descriptions of such studies,
previously or currently undertaken or sponsored by Eyetech or its Affiliates and
by any third-party investigator under any contract with Eyetech, data and
reports relating thereto which have been previously provided to Pfizer.

1.  [**]

    - Objectives:
              - Primary: [**]
    - Design:
              - [**]

    - NO-GO Criteria:
              - [**]
    - Logistics
              - [**]
2.  [**]

    - Objectives:
              - Primary: [**]
    - Design:
              - [**]
    - NO-GO Criteria:
              - [**]
    - Logistics
              - [**]
3.  [**]

    - Objectives:
              - Primary: [**]
    - Design:
              - [**]
    - NO-GO Criteria:
              - [**]
    - Logistics
              - [**]
4.  [**]

    - Objectives:
              - Primary: [**]
    - Design:
              - [**]
    - NO-GO Criteria:
              - [**]
    - Logistics
              - [**]
5.  [**]

    - Objectives:
              - Primary: [**]
    - Design:
              - [**]
    - NO-GO Criteria:
              - [**]
    - Logistics
              - [**]

                                       70

<PAGE>

6. [**]
   -Objectives:
                -Primary: [**]
   -Design:
                -[**]
   -NO-GO Criteria:
                -[**]
   -Logistics
                -[**]

7. [**]

   -Objectives:
                -Primary: [**]
   -Design:
                -[**]
   -NO-GO Criteria:
                -[**]
   -Logistics
                -[**]

8. [**]
   -Objectives
                -Primary: [**]
   -Design:
                -[**]
   -NO-GO Criteria:
                -[**]
   -Logistics
                -[**]

8.1(j)(i): (B) In addition, Eyetech plans to undertake the following
clinical studies of the Compound:

   1. [**]
      -Objectives:
                -Primary: [**]
      -Design:
                -[**]
      -NO-GO Criteria:
                -[**]
      -Logistics
                -[**]

   2. [**]
      -Objectives:
                -Primary: [**]
      -Design:
                -[**]
      -NO-GO Criteria:
                -[**]
      -Logistics
                -[**]

   3. [**]
      -Objectives:
                -Primary: [**]
      -Design:
                -[**]
      -NO-GO Criteria:
                -[**]
      -Logistics
                -[**]

                                       71

<PAGE>
4.       [**]
    -    Objectives:
         - Primary:[**]
    -    Design:
         -    [**]
    -    NO-GO Criteria:
         -    [**]
    -    Logistics
         -    [**]

5.       [**]
    -    Objectives:
         - Primary:[**]
    -    Design:
         -    [**]
    -    NO-GO Criteria:
         -    [**]
    -    Logistics
         -    [**]

6.       [**]
    -    Objectives:
         - Primary:[**]
    -    Design:
         -    [**]
    -    NO-GO Criteria:
         -    [**]
    -    Logistics
         -    [**]

7.       [**]
    -    Objectives:
         - Primary:[**]
    -    Design:
         -    [**]
    -    NO-GO Criteria:
         -    [**]
    -    Logistics
         -    [**]

8.       [**]
    -    Objectives:
         - Primary:[**]
    -    Design:
         -    [**]
    -    NO-GO Criteria:
         -    [**]
    -    Logistics
         -    [**]

9.       [**]
    -    Objectives:
         - Primary:[**]
    -    Design:
         -    [**]
    -    NO-GO Criteria:
         -    [**]
    -    Logistics
         -    [**]

8.1(j)(ii): The following is a list of all material correspondence and contact
information with the FDA and other Regulatory Authorities regarding the Compound
and the Products, copies of which have been previously provided to Pfizer.

                                       72

<PAGE>

1.       EYE001 - [**] - FDA Correspondence (Updated 9/24/02)

<TABLE>
<CAPTION>
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</TABLE>

                                       73

<PAGE>

<TABLE>
<CAPTION>
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</TABLE>

                                       74

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<TABLE>
<CAPTION>
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                                       75

<PAGE>

<TABLE>
<CAPTION>
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    Date                                 Description                   Serial #
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<S>                                      <C>                           <C>             <C>
    [**]                                    [**]

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</TABLE>

2.       [**] Correspondence (Updated 7/26/02)

<TABLE>
<CAPTION>
----------------------------------------------------
Date                                     Description
----------------------------------------------------
<S>                                      <C>
[**]                                        [**]
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</TABLE>

3.       [**] Correspondence (Updated 6/19/02)

<TABLE>
<CAPTION>
----------------------------------------------------
Date                                     Description
----------------------------------------------------
<S>                                      <C>
[**]                                        [**]
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</TABLE>

4.       [**] Correspondence (Updated 7/26/02)

<TABLE>
<CAPTION>
----------------------------------------------------
Date                                     Description
----------------------------------------------------
<S>                                      <C>
[**]                                        [**]
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[**]                                        [**]
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[**]                                        [**]
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[**]                                        [**]
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</TABLE>

5.       [**] Correspondence (Updated 7/26/02)

<TABLE>
<CAPTION>
----------------------------------------------------
Date                                    Description
----------------------------------------------------
<S>                                      <C>
[**]                                        [**]
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[**]                                        [**]
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</TABLE>

                                       76

<PAGE>

<TABLE>
----------------------------------------------------
<S>                                         <C>
[**]                                        [**]
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[**]                                        [**]
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</TABLE>

[**]6.   [**]Correspondence (Updated 6/19/02)

<TABLE>
<CAPTION>
----------------------------------------------------
Date                                     Description
----------------------------------------------------
<S>                                      <C>
[**]                                        [**]
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</TABLE>

7.       [**] Correspondence (Updated 8/29/01)

<TABLE>
<CAPTION>
----------------------------------------------------
Date                                     Description
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<S>                                      <C>
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</TABLE>

8.       [**] Correspondence (Updated 7/26/02)

<TABLE>
<CAPTION>
----------------------------------------------------
Date                                     Description
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<S>                                      <C>
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</TABLE>

                                       77

<PAGE>

<TABLE>
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<S>                                      <C>
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</TABLE>

9.   [**] Correspondence (Updated 6/19/02)

<TABLE>
<CAPTION>
----------------------------------------------------
Date                                     Description
----------------------------------------------------
<S>                                      <C>
[**]                                        [**]
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[**]                                        [**]
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</TABLE>

10.      [**] Correspondence (Updated 6/19/02)

<TABLE>
<CAPTION>
----------------------------------------------------
Date                                     Description
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<S>                                      <C>
[**]                                        [**]
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                                            [**]
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</TABLE>

11.      [**] Correspondence (Updated 6/19/02)

<TABLE>
<CAPTION>
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Date                                     Description
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<S>                                      <C>
[**]                                        [**]
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</TABLE>

12.      [**] Correspondence

<TABLE>
<CAPTION>
----------------------------------------------------
Date                                     Description
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<S>                                      <C>
[**]                                        [**]
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</TABLE>

13.      [**] Correspondence (Updated 6/19/02)

<TABLE>
<CAPTION>
----------------------------------------------------
Date                                     Description
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<S>                                      <C>
[**]                                        [**]
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</TABLE>

14.      [**] Correspondence (Updated 6/19/02)

<TABLE>
<CAPTION>
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Date                                     Description
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<S>                                      <C>
[**]                                        [**]
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</TABLE>

                                       78

<PAGE>

15.      [**] Correspondence (Updated 7/26/02)

<TABLE>
<CAPTION>
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<S>                                      <C>
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</TABLE>

16.      [**] Correspondence

<TABLE>
<CAPTION>
----------------------------------------------------
Date                                     Description
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<S>                                      <C>
[**]                                        [**]
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</TABLE>

[**]

                                       79

<PAGE>

17.      [**] Correspondence (Updated 6/19/02)

<TABLE>
<CAPTION>
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<S>                                      <C>
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</TABLE>

                                       80<PAGE>

                                                                    EXHIBIT 10.5

          CONFIDENTIAL MATERIALS OMITTED AND FILED SEPARATELY WITH THE
         SECURITIES AND EXCHANGE COMMISSION. ASTERISKS DENOTE OMISSIONS.

                             COLLABORATION AGREEMENT

                                 BY AND BETWEEN

                                   PFIZER INC.

                                       AND

                          EYETECH PHARMACEUTICALS, INC.

                          DATED AS OF DECEMBER 17, 2002

<PAGE>

                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                                                  PAGE
                                                                                                                  ----
<S>                                                                                                               <C>
ARTICLE 1 DEFINITIONS.........................................................................................       2

ARTICLE 2 CO-PROMOTION OF PRODUCTS IN THE US TERRITORY........................................................      18

     2.1  Co-Promotion........................................................................................      18
     2.2  License Grants......................................................................................      18
     2.3  Compliance With Law.................................................................................      18
     2.4  Detailing Obligations...............................................................................      18
     2.5  Training............................................................................................      18
     2.6  Promotional Materials and Call Center Communications................................................      20
     2.7  Samples.............................................................................................      20
     2.8  Distribution and Booking of Sales...................................................................      21
     2.9  Contract Sales Forces...............................................................................      21
     2.10  Delivery Technology Development Agreement..........................................................      21

ARTICLE 3 MANAGEMENT OF ALLIANCE..............................................................................      22

     3.1  Committee/Subcommittees.............................................................................      22
     3.2  Meetings............................................................................................      22
     3.3  Clinical Development/Regulatory Subcommittee........................................................      23
     3.4  Commercialization Subcommittee......................................................................      26
     3.5  Manufacturing Subcommittee..........................................................................      27
     3.6  Joint Operating Committee...........................................................................      29
     3.7  Deadlocks...........................................................................................      30
     3.8  Limitation on Decision-Making Authority.............................................................      30

ARTICLE 4 CLINICAL AND REGULATORY MATTERS.....................................................................      31

     4.1  Clinical and Regulatory Matters in the US Territory.................................................      31
     4.2  Clinical and Regulatory Matters in the ROW Territory................................................      33
     4.3  Inquiries, Adverse Events, etc. ....................................................................      35
     4.4  Pfizer's Performance of Regulatory Services Agreement Obligations...................................      36

ARTICLE 5 PRODUCT DEVELOPMENT.................................................................................      37

     5.1  Development Plan and Budget.........................................................................      37
     5.2  AMD Product and DME Product Development.............................................................      38
     5.3  Development of Products for Additional Indications in the Field.....................................      38

ARTICLE 6  LAUNCH, CO-PROMOTION AND DETAILING.................................................................      39

     6.1  Co-Promotion of Products............................................................................      39
     6.2  Marketing Plan and Budget...........................................................................      39
     6.3  Detailing...........................................................................................      40
     6.4  Detailing Reports...................................................................................      40
     6.5  Detail Shortfalls...................................................................................      41
</TABLE>

                                       i

<PAGE>

<TABLE>
<S>                                                                                                               <C>
     6.6  Sales Force Responsibilities........................................................................      44
     6.7  Product Information.................................................................................      45
     6.8  Orders..............................................................................................      45
     6.9  Audit...............................................................................................      45
     6.10  Third Party Reports................................................................................      45
     6.11  Medical Claims.....................................................................................      45
     6.12  Manufacturing......................................................................................      46
     6.13  Customer Support...................................................................................      50

ARTICLE 7 PAYMENT PROVISIONS..................................................................................      50

     7.1  Payment Currency....................................................................................      50
     7.2  Payments............................................................................................      50

ARTICLE 8 EXPENSE SHARING AND COMPENSATION....................................................................      51

     8.1  Sharing of Development Costs........................................................................      51
     8.2  Responsibility for Regulatory Costs.................................................................      53
     8.3  Responsibility for Cost of Goods Sold...............................................................      53
     8.4  Responsibility for Marketing Expenses...............................................................      54
     8.5  Net Sales Reports...................................................................................      54
     8.6  Quarterly Reconciliation of Net Sales and Expenses..................................................      54
     8.7  Offset..............................................................................................      56

ARTICLE 9 ACCOUNTING AND REPORTS..............................................................................      56

     9.1  Books and Records...................................................................................      56
     9.2  Audits..............................................................................................      56
     9.3  Sales Force Efforts.................................................................................      57

ARTICLE 10  INTELLECTUAL PROPERTY RIGHTS AND LABELING.........................................................      58

     10.1  Trademark and Corporate Logos......................................................................      58
     10.2  Copyrights and Proprietary Programs................................................................      61
     10.3  Developments.......................................................................................      62
     10.4  Third Party Agreements.............................................................................      62

ARTICLE 11  CONFIDENTIAL INFORMATION..........................................................................      63

     11.1  Treatment of Confidential Information..............................................................      63
     11.2  Confidential Information...........................................................................      64

ARTICLE 12  REPRESENTATIONS, WARRANTIES AND INDEMNIFICATION...................................................      65

     12.1  Eyetech's Representations..........................................................................      65
     12.2  Pfizer's Representations...........................................................................      66
     12.3  No Warranties......................................................................................      67
     12.4  General Indemnification in Favor of Pfizer.........................................................      67
     12.5  General Indemnification in Favor of Eyetech........................................................      68
     12.6  Product Liability and Intellectual Property Infringement Indemnification...........................      69
     12.7  "Losses"...........................................................................................      72
     12.8  No Consequential or Punitive Damages...............................................................      73
     12.9  General Indemnification Procedures.................................................................      73
</TABLE>

                                       ii

<PAGE>

<TABLE>
<S>                                                                                                               <C>
ARTICLE 13  TERM AND TERMINATION..............................................................................      77

     13.1  Term...............................................................................................      77
     13.2  Termination for Breach.............................................................................      77
     13.3  HSR Denial.........................................................................................      79
     13.4  Detail Shortfalls..................................................................................      79
     13.5  Breach of Non-Competition Obligations..............................................................      80
     13.6  Changes of Control.................................................................................      80
     13.7  Termination of License Agreement...................................................................      80
     13.8  Sales Threshold Termination........................................................................      81
     13.9  Survival of Obligations............................................................................      81

ARTICLE 14  NON-COMPETITION; DETAILING SERVICES AGREEMENT.....................................................      84

     14.1  Non-Competition....................................................................................      84
     14.2  Acquisitions Involving Competing Products..........................................................      86
     14.3  Detailing Services Agreement; Additional Agreements................................................      87

ARTICLE 15  DISPUTE RESOLUTION................................................................................      88

     15.1  Arbitration........................................................................................      88
     15.2  No Limitation......................................................................................      89

ARTICLE 16  HSR MATTERS.......................................................................................      90

     16.1  HSR Filings........................................................................................      90
     16.2  HSR Cooperation; Further Assurances................................................................      90
     16.3  Activities Prior to the Effective Date.............................................................      91

ARTICLE 17 MISCELLANEOUS......................................................................................      91

     17.1  Governing Law......................................................................................      91
     17.2  Jurisdiction.......................................................................................      91
     17.3  Waiver.............................................................................................      91
     17.4  Notices............................................................................................      92
     17.5  Entire Agreement...................................................................................      93
     17.6  Headings...........................................................................................      93
     17.7  Severability.......................................................................................      93
     17.8  Registration and Filing of the Agreement...........................................................      94
     17.9  Assignment.........................................................................................      94
     17.10 Successors and Assigns.............................................................................      94
     17.11 Divestiture by Pfizer..............................................................................      95
     17.12 Counterparts.......................................................................................      96
     17.13 Force Majeure......................................................................................      96
     17.14 Non-Solicitation of Employees......................................................................      97
     17.15  Press Releases and Other Disclosures..............................................................      97
     17.16  Third-Party Beneficiaries.........................................................................      98
     17.17  Relationship of the Parties.......................................................................      98
     17.18  Performance and Compliance by Affiliates..........................................................     100
</TABLE>

                                      iii

<PAGE>

<TABLE>
<S>                                 <C>
EXHIBIT 1.20               -        Group/Joint Details
EXHIBIT 1.52               -        Call Center Costs
EXHIBIT 2.5                -        Sales Force Training Program
EXHIBIT 3.4(d)             -        Matters where Eyetech Possesses Special Expertise
                                    or has Special Relationships
EXHIBIT 3.4(e)             -        Initially Planned Phase III(b)/IV Product Studies
EXHIBIT 5.1(a)             -        Development Programs for the AMD Product and the DME
                                    Product
EXHIBIT 5.1(b)             -        AMD Agreed Development Costs and the DME Agreed
                                    Development Costs
EXHIBIT 6.2                -        Marketing Budgets and Detailing Requirements
EXHIBIT 6.12(a)            -        Pre-Existing Clinical Supply Agreements
EXHIBIT 10.4               -        Third Party Agreements
EXHIBIT 12.6(a)(iii)       -        Certain Product Liability Matters
EXHIBIT 12.6(b)(iii)(A)    -        Eyetech 2002 Clinical Supply Costs
EXHIBIT 12.6(b)(iii)(B)    -        Certain Third Party Intellectual Property
EXHIBIT 17.15              -        Joint Press Release
EXHIBIT 17.15(c)           -        Permitted Disclosures
</TABLE>

                                       iv

<PAGE>

                             COLLABORATION AGREEMENT

         THIS COLLABORATION AGREEMENT dated as of December 17, 2002 (the
"Execution Date"), between Pfizer Inc. ("Pfizer"), a corporation organized under
the laws of the State of Delaware, having a business address at 235 East 42nd
Street, New York, New York 10017-5755, and Eyetech Pharmaceuticals, Inc.
("Eyetech"), a corporation organized under the laws of the State of Delaware,
having a business address at 500 Seventh Avenue, 18th Floor, New York, New York
10018.

         WHEREAS, the Parties have executed the Other Product-Related Agreements
(as defined below) with respect to the aptamer known as Macugen;

         WHEREAS, the Parties have also executed the Equity Agreements (as
defined below) with respect to purchases of shares of Eyetech capital stock that
have been and/or will be made from Eyetech by Pfizer, Pfizer Ireland
Pharmaceuticals, a Pfizer Affiliate organized under the laws of the Republic of
Ireland ("Pfizer Ireland"), and/or another Pfizer Affiliate designated by
Pfizer;

         WHEREAS, the Parties have also executed the Detailing Services
Agreement (as defined below); and

         WHEREAS, the Parties would like to set forth the terms and conditions
pursuant to which they will collaborate in connection with the worldwide
development and commercialization of products containing or based on the Macugen
aptamer and with respect to certain other matters as described in this Agreement
and in the Other Product-Related Agreements.

         NOW, THEREFORE, the Parties agree as follows:

<PAGE>

                                    ARTICLE 1

                                   DEFINITIONS

         The following terms, whether used in the singular or plural, shall have
the following meanings:

         1.1      "Act" means both the United States Food, Drug and Cosmetic
Act, as amended, and the regulations promulgated under the foregoing.

         1.2      "Affiliate" means any Person directly or indirectly controlled
by, controlling or under common control with, a Party, but only for so long as
such control shall continue. For purposes of this definition, "control"
(including, with correlative meanings, "controlled by", "controlling" and "under
common control with") means, with respect to a Person, possession, direct or
indirect, of (a) the power to direct or cause direction of the management and
policies of such Person (whether through ownership of securities or partnership
or other ownership interests, by contract or otherwise), or (b) at least 50% of
the voting securities (whether directly or pursuant to any option, warrant or
other similar arrangement) or other comparable equity interests. For the
avoidance of doubt, neither of the Parties shall be deemed to be an "Affiliate"
of the other.

         1.3      "AMD Product" means a Product developed for use in the
treatment of age-related macular degeneration.

         1.4      "API Bulk Drug Substance Supplier" means a third-party
supplier of active pharmaceutical ingredient bulk drug substance for Products
with which Eyetech or Pfizer enters into a supply agreement pursuant to Section
6.12.

         1.5      "Approval" means receipt from FDA of approval to market a drug
product in the US Territory.

                                       2

<PAGE>

         1.6      "Bankruptcy Code" means 11 USC Sections 101-1330, as amended.

         1.7      "beneficial ownership" (and other correlative terms) by a
Person means, with respect to any security: (a) such Person or any of such
Person's Affiliates directly or indirectly owns such security; (b) such Person
or any of such Person's Affiliates has the right to acquire such security
(whether such right is exercisable immediately or only after the passage of
time) pursuant to any agreement, arrangement or understanding (whether or not in
writing) or upon the exercise of conversion rights, exchange rights, rights,
warrants or options, or otherwise; or (c) ownership, direct or indirect, by any
other Person with which such Person or any of such Person's Affiliates has any
agreement, arrangement or understanding for the purpose of acquiring, holding,
voting or disposing of such security; provided, however, that a Person shall not
be deemed to have beneficial ownership of any security by virtue of an
agreement, arrangement or understanding to vote such security that arises solely
from a revocable proxy or consent given to such Person in response to a public
proxy or consent solicitation made pursuant to, and in accordance with, the
applicable rules and regulations of the Securities Exchange Act of 1934, as
amended.

         1.8      "Business Day" means a day that is not a Saturday, Sunday or a
day on which banking institutions in New York, New York are authorized by Law to
remain closed.

         1.9      "Call Center" means the call center to be established by
Pfizer and substantially dedicated to receiving and answering Product-related
inquiries and complaints from or on behalf of, as applicable, Product-users,
physicians, managed care organizations, and others residing in the US Territory.

                                       3

<PAGE>

         1.10     "Change in Control" means, with respect to a Party, an event
where:

                  (a)      any Person or group of Persons (as the term "group"
is interpreted pursuant to Rule 13d-5 under the Securities Exchange Act of 1934,
as amended) acquires beneficial ownership of capital stock of the Party (other
than (x) directly from such Party or (y) from underwriter(s) of such Party's
capital stock in a public offering) entitling the holder(s) thereof to at least
a majority of the voting power of the then outstanding capital stock of such
Party with respect to the election of directors of such Party, or

                  (b)      the Party enters into a merger, consolidation,
reorganization or similar transaction with another Person (the "Acquiring
Corporation") in which less than a majority of the voting power of the
outstanding capital stock of such Party (if it is the surviving entity) or of
the Acquiring Corporation (if it is the surviving entity) with respect to the
election of directors following such transaction is held by Persons who were
shareholders of such Party immediately prior to such transaction, or

                  (c)      the Party sells to any Person(s) in one or more
related transactions properties or assets representing all or substantially all
of the properties and assets of such Party.

         1.11     "CMC" means the chemistry, manufacturing and controls section
of the Product NDA.

         1.12     "Code" or "Codes" means the Code on Interactions with
Healthcare Professionals promulgated by the Pharmaceutical Research and
Manufacturers of America (PhRMA), the American Medical Association Guidelines on
Gifts to Physicians, and the PhRMA Principles on Conduct of Clinical Trials and
Communication of Clinical Trial Results, as any of the foregoing may be amended.

                                       4

<PAGE>

         1.13     "Commercially Reasonable Efforts" means, with respect to a
Product, commercially reasonable efforts, which in no event will be less than
the efforts the Party required to make such efforts generally uses (as
applicable in the context used in this Agreement) in developing, seeking
Approvals, manufacturing, promoting, detailing and marketing its other
pharmaceutical products (if any) that are comparable to such Product, taking
into account product labeling or anticipated labeling, market potential, past
performance (if any), economic return potential, medical and clinical
considerations, the regulatory environment, and competitive market conditions in
the therapeutic area, all as measured by the facts and circumstances at the time
such efforts are due.

         1.14     "Competing Product" means [**].

         1.15     "Consumer Price Index" or "CPI" means the Consumer Price Index
- Urban Wage Earners and Clerical Workers, U.S. City Average, All Items, 1982-84
= 100, published by the United States Department of Labor, Bureau of Statistics
(or its successor equivalent index).

         1.16     "Co-Promotion" means the joint marketing and promotion
(including without limitation Detailing) of the Products in the US Territory as
described in Article 6. "Co-Promote" when used as a verb shall mean to engage in
the activities described in Article 6.

         1.17     "Co-Promotion Budget" is defined in Section 6.2.

         1.18     "Co-Promotion Term" means the period from the Effective Date
until the later of (a) the expiration of the last to expire Valid Claim (as such
term is defined in the License Agreement) in the United States of America and
(b) 15 years after Launch of the last Product in the US Territory, unless sooner
terminated as provided in this Agreement.

         1.19     "Cost of Goods Sold" means Manufacturing Costs plus or minus
an adjustment to be mutually agreed by the Parties from time to time for
variances between the standard cost

                                       5

<PAGE>

component(s) of Manufacturing Costs and the actual costs incurred by the Parties
that such standard cost component(s) are intended to cover.

         1.20     "Detail" means a face-to-face contact of either an Eyetech or
Pfizer Sales Representative, as the case may be, with a medical professional
with prescribing authority during which scientific and/or medical information
about a Product is discussed. A Detail does not include a reminder or sample
drop. With respect to certain group or institutional presentations, or joint
details by Sales Representatives of both parties, Exhibit 1.20 sets forth how
such presentations will be counted for determination of the number of Details.
Details shall be measured by each Party's internal recording of such activity,
provided that such measurement shall be on the same basis as the recording
Party's measurement for its sales representatives detailing of such recording
Party's other products (if any), consistently applied throughout the
Co-Promotion Term. When used as a verb, the term "Detailing" means to engage in
the activity of a Detail.

         1.21     "Detailing Services Agreement" means the Detailing Services
Agreement dated as of the Execution Date between the Parties relating to an
arrangement by which Eyetech may, at its option, detail for Pfizer on a contract
basis Xalatan, Xalcom, and any other products approved for use in the Field
containing latanoprost as an active ingredient, including without limitation
Xalatan and Xalcom life-cycle products, that are owned by Pfizer or its
Affiliates.

         1.22     "Detailing Report" is defined in Section 6.4.

         1.23     "Detail Requirement" means the number of Details that each
Party's Sales Representatives are required to perform in the US Territory
pursuant to a Marketing Plan.

         1.24     "Development Costs" means the costs, including without
limitation Out-of-Pocket Costs in relation to the preclinical and clinical
development of Products and the conduct

                                       6

<PAGE>

of Product Studies and direct and identifiable variable personnel costs in
relation to preclinical development of Products and the conduct of preclinical
Product Studies, as set forth in each relevant Development Plan; provided,
however, Development Costs shall not include any (a) Out-of-Pocket Costs paid by
either Party prior to December 1, 2002, (b) [**], or (c) except for direct and
identifiable variable personnel costs explicitly provided for in this Section
1.24, Internal Costs.

         In addition, Development Costs shall include Out-of-Pocket Costs and
direct and identifiable variable personnel costs of (w) manufacturing clinical
supplies of Products, (x) process development for clinical and commercial scale
manufacture of Products, including without limitation manufacturing process
optimization in accordance with Section 6.12(h), (y) stability studies and (z)
providing manufacturing transition support in accordance with Section 6.12.

         1.25     "Development Plan" is defined in Section 5.1.

         1.26     "Distribution Agreement" means the Distribution Agreement
dated as of the Execution Date between the Parties relating to the provision by
Pfizer of Product distribution services in the US Territory on a contract basis
for Eyetech.

         1.27     "DME Product" means a Product developed for use in the
treatment of diabetic macular edema.

         1.28     "DOJ" means the United States Department of Justice.

         1.29     "Effective Date" means the HSR Clearance Date.

         1.30     "Equity Agreements" means (a) the Series D Preferred Stock
Purchase Agreement dated as of the Execution Date, to which the Parties and
Pfizer Ireland are parties, and (b) the Amended and Restated Investors' Rights
Agreement, the Amended and Restated Right of First

                                       7

<PAGE>

Refusal and Co-Sale Agreement and the Amended and Restated Voting Agreement,
each to be entered into by Eyetech and Pfizer Ireland after the Execution Date
in accordance with the aforementioned Series D Preferred Stock Purchase
Agreement.

         1.31     "FDA" means the United States Food and Drug Administration and
any successor agency thereto.

         1.32     "Field" means the prevention, treatment or control of all
ophthalmic diseases or conditions.

         1.33     "Fill and Finish Services Supplier" means a third party
supplier of fill and finish services necessary to produce Products in finished
(i.e., ready for administration to patients) form for sale in the US Territory
with which Eyetech or Pfizer enters into an agreement pursuant to Section 6.12.

         1.34     "First Approval" means the first Approval of a Product.

         1.35     "FTC" means the United States Federal Trade Commission.

         1.36     "Funded Inventory Build Costs" means the amount of pre-Launch
Manufacturing Costs funded by each of the Parties pursuant to Section 6.12(f).
Each Party's Funded Inventory Build Costs shall be increased by amounts funded
pursuant to Section 6.12(f) and reduced by the Inventory Build Credit applied
pursuant to Section 8.3.

         1.37     "GAAP" means accounting principles generally accepted in the
United States of America.

         1.38     "GMP" means the Good Manufacturing Practices regulations
promulgated by the FDA under the Act as of the time of manufacture of the
applicable Products.

         1.39     "Governmental Authority" means any court, agency, department
or other instrumentality of any foreign, federal, state, county, city or other
political subdivision.

                                       8

<PAGE>

         1.40     "HSR Act" means the Hart-Scott-Rodino Antitrust Improvements
Act of 1976, as amended (15 U.S.C. Sec. 18a), and the rules and regulations
promulgated thereunder.

         1.41     "HSR Clearance" means either (a) early termination of the
applicable waiting period under the HSR Act with respect to the HSR Filings or
(b) expiration of the applicable waiting period under the HSR Act with respect
to the HSR Filings.

         1.42     "HSR Clearance Date" means the earlier of (a) the date on
which the FTC or DOJ shall notify Eyetech and Pfizer of early termination of the
applicable waiting period under the HSR Act or (b) the day after the date on
which the applicable waiting period under the HSR Act expires.

         1.43     "HSR Filings" means the filings by Pfizer and Eyetech with the
FTC and the Antitrust Division of the DOJ of a Notification and Report Form for
Certain Mergers and Acquisitions (as that term is defined in the HSR Act) with
respect to the matters set forth in the Transaction Agreements, together with
all required documentary attachments thereto.

         1.44     "IND" means an investigational new drug application filed with
the FDA with respect to a Product.

         1.45     "Internal Costs" means a Party's and/or its Affiliate's costs
and expenses for overhead, personnel, rent, depreciation and amortization,
utilities, equipment leases, general and administrative expenses and similar
items.

         1.46     "Know-How" means unpatented technical and other information
which is not known to the public, including information comprising or relating
to concepts, discoveries, data, designs, formulae, methods, models, assays,
research plans, procedures, designs for experiments and tests and results of
experimentation and testing (including results of research or development),
together with processes, including manufacturing processes, specifications,

                                       9

<PAGE>

techniques, chemical, pharmacological, toxicological, clinical, analytical and
quality control data, trial data, case report forms, data analyses, reports or
summaries, including documents (which shall include paper, notebooks, books,
files, ledgers, records, tapes, discs, diskettes, CD-ROM and any other media on
which the foregoing information can be permanently stored) containing any of the
foregoing information. The fact that an item is known to the public shall not be
taken to exclude the possibility that a compilation including the item, and/or a
development related to the item, is (or remains) not known to the public.

         1.47     "Launch" means the initial shipping of a Product as a, or for,
commercial sale to an unaffiliated third party, excluding any shipping for test
marketing, clinical trial purposes or compassionate or similar use.

         1.48     "Law" or "Laws" means all laws, statutes, rules, Codes,
regulations, orders, judgments and/or ordinances of any Governmental Authority.

         1.49     "License Agreement" means the License Agreement dated as of
the Execution Date between the Parties.

         1.50     "Major Country" means France, Germany, Italy, Spain or the
United Kingdom.

         1.51     "Manufacturing Costs" means costs that relate to (a) Products
supplied by a non-Affiliate third party, or (b) Products manufactured directly
by a Party or an Affiliate of a Party. In the case of (a), Manufacturing Costs
shall be a "standard cost" per unit, which standard cost shall include (i) the
amount paid to such a third party, plus (ii) the manufacturing Party's (i.e.,
the Party then responsible for manufacturing pursuant to Section 6.12) direct
and identifiable Internal Costs and Out-of-Pocket Costs, which amounts shall be
subject to the other Party's reasonable approval, incurred or accrued by the
manufacturing Party in connection with quality assurance, supply chain
management, and similar activities comprising the manufacturing

                                       10

<PAGE>

Party's oversight of the manufacturing process of the non-Affiliate third party.
In the case of (b), Manufacturing Costs shall be a "standard cost" per unit,
which standard cost shall include the cost of raw materials, labor, and other
direct and identifiable variable costs and appropriate costs for equipment
pools, plant operations and plant support services. The costs for plant
operations and support services would include utilities, maintenance,
engineering, safety, human resources, finance, plant management and other
similar activities. The plant operations and support services costs would be
allocated on a mutually agreed basis consistent with GAAP. Costs which cannot be
identified to a specific activity supporting product manufacturing, such as
charges for corporate overhead which are not controllable by the manufacturing
plant, shall not be included in standard cost.

         1.52     "Marketing Expenses" means all Out-of-Pocket Costs paid or
accrued by a Party pursuant to a Marketing Plan and directly related to the
Co-Promotion of the Products in the US Territory, including those in connection
with:

                  (a) [**]

                  (b) [**] for the Products [**]; (iii) [**] the Products [**];
(iv) [**]; (v) [**] the Products [**]; and (vi) [**] the Products [**]. With
respect to [**] as determined in accordance with [**] subject to [**]; and

                  (c) [**] the Products.

         Notwithstanding the foregoing, Marketing Expenses shall not include any
costs or expenses incurred prior to the Execution Date, and shall include (i)
Eyetech's Out-of-Pocket Costs and direct and identifiable variable personnel
costs incurred pursuant to Section 6.13 and amounts paid by Eyetech to Pfizer
pursuant to the Distribution Agreement and (ii) filing or other user fees or
maintenance fees paid to the FDA in order for Eyetech or Pfizer, as the case may
be, to obtain or maintain regulatory approval for the Products.

                                       11

<PAGE>

         All other Out-of-Pocket Costs incurred in the Co-Promotion of the
Products in the US Territory, but not specifically identified above, but which
have been approved by the CSC or provided for in the Marketing Plan, shall be
accounted for and deemed Marketing Expenses for all purposes of this Agreement.

         1.53     "Marketing Plan" is defined in Section 6.2.

         1.54     "NDA" means a New Drug Application filed with the FDA with
respect to a Product.

         1.55     "Net Sales" means the gross amounts billed or invoiced by
Eyetech and its Affiliates for Products in the US Territory, less the following
deductions:

                  (a)      trade, quantity and cash discounts allowed, but
expressly excluding discounts or allowances offered as part of a package of
products that includes a Product sold by Eyetech or its Affiliates;

                  (b)      refunds, chargebacks and any other allowances which
effectively reduce the net selling price;

                  (c)      actual product returns, credits and allowances
allowed to customers, and actual bad debts;

                  (d)      rebates actually paid or credited to any governmental
agency (or branch thereof) or to any third party payor, administrator or
contractee;

                  (e)      discounts mandated by, or granted to meet the
requirements of, applicable state, provincial or federal law, wholesaler,
including required chargebacks and retroactive price reductions;

                                       12

<PAGE>

                  (f)      transportation, freight, postage charges and other
charges, such as insurance, relating thereto, in each case included as a
specific line item on an invoice to such third parties; and

                  (g)      taxes, excises or other governmental charges upon or
measured by the production, sale, transportation, delivery or use of goods, in
each case included as a specific line item on an invoice to such third parties.

         If any such sales to third parties are made in transactions that are
not at arm's length between the buyer and the seller, then the gross amount to
be included in the calculation of Net Sales shall be the amount that would have
been invoiced had the transaction been conducted at arm's length. Such amount
that would have been invoiced shall be determined, wherever possible, by
reference to the average selling price of the relevant Product in arm's-length
transactions in the US Territory.

         If Eyetech or its Affiliate sells a Product in unfinished form to a
third party for resale, then the gross amount to be included in the calculation
of Net Sales arising from such sale shall be the amount invoiced by the third
party upon resale, in lieu of the amounts invoiced by Eyetech or its Affiliates
when selling the Product in unfinished form. Otherwise, where Eyetech or its
Affiliate sells a Product in finished form to a third party that does not
require a sublicense under the Eyetech Patents for further resale (each such
third party hereinafter a "Distributor"), the amount to be included in the
calculation of Net Sales shall be the price invoiced from Eyetech or its
Affiliate to the third party, not the amount invoiced by the third party upon
resale.

         If, in addition to or in lieu of a transfer price paid for quantities
of Product supplied, any Distributor provides consideration to Eyetech or its
Affiliate in connection with any Product or the Distributor's rights or
relationship with Eyetech or its Affiliate in relation thereto, then such

                                       13

<PAGE>

consideration shall be included in the calculation of Net Sales in the Quarter
in which it becomes due to Eyetech or its Affiliate (as applicable).

         Notwithstanding the foregoing, amounts received by Eyetech or its
Affiliates (x) for the sale of Products among Eyetech and its Affiliates for
resale or (y) for the sale of Products by Eyetech or its Affiliates to Pfizer or
its Affiliates or sublicensees for resale in the ROW Territory, shall not be
included in the computation of Net Sales hereunder.

         Net Sales shall be determined from books and records maintained in
accordance with GAAP, consistently applied throughout the organization and
across all products of the entity whose sales of Product are giving rise to Net
Sales.

         1.56     "Other Product-Related Agreements" means the License
Agreement, the Distribution Agreement and the Regulatory Services Agreement.

         1.57     "Out-of-Pocket Costs" means costs and expenses paid to third
parties (or payable to third parties and accrued in accordance with GAAP), other
than Affiliates or employees, by either Party after the Execution Date (or, in
the case of Development Costs, after December 1, 2002).

         1.58     "Party" means either Eyetech or Pfizer; "Parties" means both
Eyetech and Pfizer.

         1.59     "Person" means any natural person or any corporation, company,
partnership, joint venture, firm or other entity, including without limitation a
Party.

         1.60     "Pharmacia Merger" means the merger contemplated by the
Agreement and Plan of Merger dated as of July 13, 2002 among Pfizer, Pilsner
Acquisition Sub Corp., a wholly owned Subsidiary of Pfizer, and Pharmacia
Corporation ("Pharmacia") (as the same may be amended or supplemented or
restated from time to time, the "Pharmacia Merger Agreement") providing for the
merger of Pilsner Acquisition Sub Corp. with and into Pharmacia.

                                       14

<PAGE>

         1.61     "Phase III Clinical Study" means a Product Study with study
design and statistical power intended to meet the requirement for Approval by
the FDA.

         1.62     "Phase III(b)/IV Product Study" means a clinical study
designed to support or profile a Product or intended to be the basis of a
post-approval Product filing, including without limitation proposed label
changes not explicitly described in Section 1.64 below, but not including any
clinical study intended to be the basis of any regulatory filing for initial FDA
or other Governmental Authority approval for marketing of Products or conducted
as a condition to the prior receipt of any regulatory approval for marketing of
Products. Phase III(b)/IV Product Studies shall include, without limitation,
epidemiological studies and modeling and pharmacoeconomic studies.

         1.63     "Product" means any product, that (a) contains or is based on
the anti-VEGF aptamer known as "Macugen" or "EYE001", including any metabolites
or prodrugs of such aptamer or any hydrates, conjugates, salts, esters, isomers,
polymorphs or analogues of any of the foregoing, either alone or in combination
with one or more other therapeutically active substances, and (b) is for use in
the Field; including for the avoidance of doubt any AMD Product, DME Product or
other product developed in accordance with the terms of this Agreement for any
indication in the Field other than AMD or DME, or as a new un-pegylated
formulation of any such AMD Product, DME Product or other product (each such
other product, an "Additional Developed Product").

         1.64     "Product Studies" means clinical, preclinical, safety, and
other studies that are designed to support FDA or other Governmental Authority
approval for marketing of Products. For the avoidance of doubt, Product Studies
shall not include [**], but shall include [**].

         1.65     "PSURs" means periodic safety update reports.

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<PAGE>

         1.66     "Quarter" means (i) with respect to Eyetech, each of the
periods ending on March 31, June 30, September 30 and December 31, and (ii) with
respect to Pfizer each of the periods ending at the end of each of the four (4)
thirteen (13) week periods as used by Pfizer as reported in its filings with the
Securities and Exchange Commission, the first such period commencing on January
1 of any year, and the terms "Eyetech Quarter" and "Pfizer Quarter" shall be
construed accordingly.

         1.67     "Regulatory Costs" means the costs, including without
limitation the Out-of-Pocket Costs and direct and identifiable variable
personnel costs, in relation to making or supporting regulatory filings in the
US Territory; provided, however, Regulatory Costs shall not include any (a)
Out-of-Pocket Costs paid by either Party prior to the Execution Date, (b) costs
of making or supporting regulatory filings in the ROW Territory, or (c) except
for direct and identifiable variable personnel costs explicitly provided for in
this Section 1.67, Internal Costs. In addition, Regulatory Costs shall include
amounts paid by Eyetech to Pfizer under the Regulatory Services Agreement.

         1.68     "Regulatory Services Agreement" means the Regulatory Services
Agreement dated as of the Execution Date between the Parties relating to the
provision by Pfizer of specified regulatory services in the US Territory on a
contract basis for Eyetech.

         1.69     "ROW Territory" means all countries in the world other than
the US Territory.

         1.70     "Sales Representative" means an individual who engages in
Detailing and other promotional efforts in the Field with respect to the
Products and who has been trained and is employed by either Pfizer or Eyetech or
their respective Affiliates.

         1.71     "Senior Executive" means, with respect to Eyetech, the Chief
Executive Officer of Eyetech, and with respect to Pfizer, a corporate officer of
Pfizer with senior decision-making

                                       16

<PAGE>

authority; "Senior Executives" means both such officers. Pfizer shall initially
designate Karen Katen as its Senior Executive.

         1.72     "Specifications" means the specifications for the manufacture
and packaging of the Products consistent with the NDA.

         1.73     "Subsidiary" means, with respect to a Party, a majority or
wholly-owned direct or indirect subsidiary of such Party.

         1.74     "Territory" means the US Territory and the ROW Territory.

         1.75     "Trademark" means (i) MACUGEN and (ii) any other trademark
associated with the Products that may be selected by the Parties in accordance
with Section 10.1(e), excluding the respective corporate names and logos of the
Parties.

         1.76     "Transaction Agreements" means this Agreement, the Other
Product-Related Agreements, the Equity Agreements and the Detailing Services
Agreement.

         1.77     "US Territory" means the United States of America, including
its territories, possessions and Puerto Rico.

         1.78     "Xalatan" means latanoprost ophthalmic solution which is
presently sold by Pharmacia under the trademark Xalatan(R) as a single entity.

         1.79     "Xalcom" means product containing as active ingredients
latanoprost and timolol and which is presently sold by Pharmacia under the
trademark Xalcom(R) as a single entity.

         1.80     "Year" means each calendar year during the Co-Promotion Term.

                                       17

<PAGE>

                                    ARTICLE 2

                  CO-PROMOTION OF PRODUCTS IN THE US TERRITORY

         2.1      Co-Promotion. Subject to the terms of this Agreement, the
Parties shall Co-Promote Products in the US Territory co-exclusively with each
other as provided in this Agreement.

         2.2      License Grants. Each Party's rights under intellectual
property rights owned or controlled by the other Party, with respect to the
development, manufacture and Co-Promotion of Products in the US Territory, are
as set forth in the License Agreement.

         2.3      Compliance With Law. Both Pfizer and Eyetech shall Co-Promote
the Products in the US Territory in accordance with applicable Law, the terms of
this Agreement and the then-current Marketing Plan. Neither Party shall be
required to undertake any action or inaction, or to incur expenditures in
connection with any such action or inaction under this Agreement that it
believes, in good faith, may violate any Law.

         2.4      Detailing Obligations. Subject to Exhibit 6.2, the Detailing
obligations of the Parties in respect of the Products shall be as set out in the
then-current Marketing Plan.

         2.5      Training.

                  (a)      Pfizer shall, at its sole expense, provide initial
sales and product training in connection with the first Product Detailed by
Eyetech Sales Representatives in the US Territory pursuant to this Agreement for
up to forty (40) Eyetech Sales Representatives. Eyetech may also elect to have
Pfizer provide such initial sales and product training to an additional fifteen
(15) Eyetech Sales Representatives, in which case Eyetech shall reimburse Pfizer
for Pfizer's Out-of-Pocket Costs and direct and identifiable variable personnel
costs incurred in connection with such training for such additional Sales
Representatives. Such training shall, at Eyetech's option,

                                       18

<PAGE>

be conducted in multiple program sessions; provided that Pfizer shall not be
required to provide more than four (4) separate program sessions, the first
three (3) of which shall be for not less than ten (10) Eyetech Sales
Representatives each. A description of Pfizer's current initial sales force
training program is described in Exhibit 2.5. Such program is subject to
revision from time to time by Pfizer, provided that the initial training
provided by Pfizer to Eyetech from time to time shall be the same as the initial
training that Pfizer contemporaneously provides to Pfizer's Sales
Representatives that Detail Products. Pfizer will provide ongoing training
relating to Products for the trainers of Eyetech's Sales Representatives. All
training programs for Eyetech's Sales Representatives other than the initial
sales and product training will be the responsibility of Eyetech, at its sole
expense; provided, however, that Pfizer will provide follow-up training for such
Eyetech Sales Representatives at Eyetech's reasonable request, provided that
Eyetech reimburses Pfizer for the reasonable costs and expenses incurred by
Pfizer in connection with such follow-up training. In order to coordinate the
training of Eyetech Sales Representatives with training of Pfizer Sales
Representatives, any training provided by Pfizer to Eyetech Sales
Representatives pursuant to this Section 2.5(a) shall take place at times and at
locations reasonably selected by Pfizer in consultation with Eyetech.

                  (b)      Pfizer and Eyetech shall, each at its own expense
(except as otherwise set forth in Section 2.5(a)), comply with any training plan
for the Products contained in the applicable Marketing Plan.

                  (c)      If a Party organizes Co-Promotion-related meetings of
its employees (such as periodic briefings of its Sales Representatives), it will
make reasonable efforts to keep the Product-related portions of such meetings
independent from other matters and to give the other Party advance notice of
such meetings. If requested by the other Party, the Party organizing such

                                       19

<PAGE>

meeting will permit Sales Representatives of the other Party to attend and
participate in such meetings or such portions thereof which relate to the
Co-Promotion of Products.

         2.6      Promotional Materials and Call Center Communications. The
Parties will only utilize promotional, advertising, communication and
educational materials relating to the Products in the US Territory (collectively
"Promotional Materials") and only conduct promotional activities for the
Products which, in each case, have been approved in the Marketing Plan or
otherwise by the CSC (as defined in Section 3.1). All Promotional Materials
shall name and feature both Parties with equal prominence. All promotional
activities conducted by the Parties shall be consistent with the Promotional
Materials so approved and the then-current Marketing Plan. Promptly after the
Effective Date, the Parties will mutually agree upon procedures whereby
designated representatives of each of them representing the marketing, medical,
regulatory and legal functions, will meet, whether in person, by telephone or by
videoconference, in order to discuss all promotional activities (except for
Detailing) and Promotional Materials prior to final approval thereof by the CSC.
In addition, as a prominent part of each communication with customers and other
third parties, the Call Center shall clearly identify the Products as joint
products of Eyetech and Pfizer. Eyetech shall own all rights to all Promotional
Materials, including all copyrights thereto, and Pfizer hereby assigns to
Eyetech all rights, title and interests of Pfizer in and to such Promotional
Materials, including without limitation all copyright interests of Pfizer
therein. Unless and until Promotional Materials are approved by the CSC for
publication or other general dissemination, each Party shall maintain them in
confidence pursuant to the terms of Article 11.

         2.7      Samples. The Parties, through the CSC, shall determine whether
it is necessary and appropriate to undertake a sampling program for the first
Product and, if so, the appropriate

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<PAGE>

terms and allocation of responsibilities for satisfying such sampling program;
provided that any samples will be allocated fairly between the Parties'
respective Sales Representatives in accordance with the Detailing arrangements
set forth in the Marketing Plan; and provided further that each Party shall be
responsible, at its sole expense, for (a) accounting for samples held, disposed
of or distributed by such Party or its Sales Representatives, (b) destroying and
disposing of samples after the latest date on which such samples are usable and
(c) complying with the requirements of all applicable Laws, including without
limitation the requirements of the Prescription Drug Marketing Act of 1987, as
amended.

         2.8      Distribution and Booking of Sales. Eyetech shall be
responsible for distribution, invoicing, credit and collection for the Products
in the US Territory. Eyetech will book all sales of Products in the US
Territory; provided that this Section 2.8 shall not be construed as an assurance
by Pfizer to Eyetech regarding the appropriate accounting treatment of such
sales.

         2.9      Contract Sales Forces. Without the consent of the other Party,
neither Pfizer nor Eyetech may use any contract sales force to Co-Promote or
Detail any Product.

         2.10     Delivery Technology Development Agreement. Promptly after the
Effective Date, the Parties shall in good faith discuss entering into a separate
agreement to provide for the development by the Parties of additional Product
delivery technology. The Parties intend to provide in such agreement for a
sharing between the Parties of the costs and benefits of developing and
commercializing such additional delivery technology on the same basis as
development costs and commercialization benefits are shared under this Agreement
and the License Agreement; provided that, for the avoidance of doubt, it is
agreed that neither Party would be required to make any upfront license fee
payments to the other Party in connection with such separate agreement.

                                       21

<PAGE>

                                    ARTICLE 3

                             MANAGEMENT OF ALLIANCE

         3.1      Committee/Subcommittees. In order to fulfill the objectives of
this Agreement, the Parties agree to establish a Joint Operating Committee
("JOC"), a Commercialization Subcommittee ("CSC"), a Clinical
Development/Regulatory Subcommittee ("CDRSC"), and a Manufacturing Subcommittee
("MSC"), and such other committees and subcommittees as may be established by
mutual consent of Eyetech and Pfizer. Each committee and subcommittee shall have
two co-chairpersons, one designated by each of Eyetech and Pfizer. All decisions
of the committees and subcommittees shall be by a vote of the co-chairpersons,
each co-chairperson having one vote, and all decisions shall be by unanimous
consent of the co-chairpersons.

         3.2      Meetings. The chairpersons of the JOC, CSC, CDRSC, MSC, or any
other committee or subcommittee, shall call meetings quarterly, or as otherwise
requested by one of the Parties. Meetings may be held in person, by telephone,
or by video conference call, and the location of each meeting shall alternate
between sites located in New York, New York selected by each co-chairperson.
Additional participants may be invited by any representative to attend meetings
where appropriate. The Parties shall cause their respective representatives on
the committees and subcommittees to use diligent efforts, acting in good faith,
to resolve all matters presented to them as expeditiously as possible.

                                       22

<PAGE>

         3.3      Clinical Development/Regulatory Subcommittee.

                  (a)      The CDRSC shall consist of research and development,
commercial, regulatory and marketing/medical managers (as needed) from each of
Eyetech and Pfizer, each of which shall confirm to the other its designees. The
CDRSC will establish a clinical development working group that shall be
responsible for:

                           (i)      Preparing annual Development Plans;

                           (ii)     Monitoring progress of all Product Studies
in the Territory (including reviewing costs and activities against the annual
Development Plan);

                           (iii)    Facilitating the exchange of all development
information and data relating to all Product Studies in the Territory;

                           (iv)     Review and approval of statistical analysis
plans and protocols for all Product Studies in the Territory and revising any
investigator's brochure(s); and

                           (v)      Providing updates on its activities and
achievements to the JOC.

                  (b)      The CDRSC will also establish a regulatory working
group that will be responsible for:

                           (i)      Overseeing, monitoring and coordinating all
regulatory (FDA) aspects of the US Territory Product Approval program, including
all US Territory regulatory actions, communications and filings (including
matters pertaining to Product labeling) and submissions (including filings and
submissions of supplements and amendments to FDA with respect to the Products);

                           (ii)     Establishing the schedule and implementation
strategy for all FDA filings;

                                       23

<PAGE>

                           (iii)    Coordinating preparation for and attendance
at FDA advisory committee meetings;

                           (iv)     Coordinating responses to additional FDA
requirements and FDA inquiries;

                           (v)      Proposing, overseeing and agreeing upon a
regulatory strategy and plan for obtaining regulatory approvals for the Products
in the Territory;

                           (vi)     Facilitating the exchange of all regulatory
information and data relating to Products in the Territory;

                           (vii)    Facilitating the exchange of information in
conjunction with Section 4.3 of this Agreement in order to ensure that
significant issues concerning adverse event information and safety issues are
addressed consistently among Governmental Authorities in the Territory; and

                           (viii)   Providing updates on its activities and
achievements to the JOC.

                  (c)      Neither Party shall make any change to any annual
Development Plan without the prior approval of the CDRSC, and all Development
Plans and Development Costs provided therein shall be consistent with the terms
of this Agreement. If the CDRSC is unable to reach a decision on any issue
within fifteen (15) Business Days after presentation, either Party may refer the
issue to the JOC for resolution.

                  (d)      Following a referral to the Senior Executives of the
Parties pursuant to Section 3.7 below, the final decision-making authorities set
out in Sections 3.3 (e), (f), (g) and (h) shall apply.

                  (e)      [**] shall have the final decision-making authority
for matters relating to [**] for such Product [**] to such Product [**];
provided, however, that [**] shall have the final

                                       24

<PAGE>

decision-making authority as to [**], provided that [**]. For purposes of the
previous sentence, [**]; provided, however, that [**].

                  (f)      [**] shall have final decision-making authority with
respect to [**] the Parties shall [**]. Except as otherwise set forth in this
Agreement, [**] shall have final decision-making authority with respect to [**].

                  (g)      Notwithstanding the Parties' joint approval rights
set forth in Section 3.3(f), [**] may not prevent [**] from [**] for the
applicable Product, [**].

                  (h)      Subject to Pfizer's fulfillment of its obligations
under the Regulatory Services Agreement, which shall require Pfizer to perform
its obligations thereunder in a commercially reasonable manner, in the event
that Eyetech materially fails to discharge its regulatory obligations in the US
Territory in a commercially reasonable manner applying accepted pharmaceutical
industry standards, and in compliance with all Laws, and fails to cure such
failure following written notice thereof from Pfizer and a reasonable
opportunity to cure, then the final decision-making authority with respect to
[**] the Products [**] shall be transferred to Pfizer for the balance of the
Co-Promotion Term; provided that in the event that after such transfer (x)
Pfizer closes a Divestiture Transaction pursuant to Section 17.11 or (y)
materially fails to discharge its regulatory obligations in the US Territory in
a commercially reasonable manner applying accepted pharmaceutical industry
standards, and in compliance with all Laws, and fails to cure such failure
following written notice thereof from Eyetech and a reasonable opportunity to
cure, then the final decision-making authority with respect to [**] the Products
[**] shall thereafter be exercised jointly by the Parties for the balance of the
Co-Promotion Term.

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<PAGE>

         3.4      Commercialization Subcommittee.

                  (a)      The CSC shall consist of members from each of Eyetech
and Pfizer, each of which shall confirm to the other its designees. The CSC
shall be responsible with respect to the US Territory for:

                           (i)      Preparing and implementing annually the
Marketing Plan;

                           (ii)     Monitoring progress under and compliance
with the Marketing Plan;

                           (iii)    Coordinating with the CDRSC with respect to
regulatory issues and future Product development activities to be undertaken
pursuant to the Development Plans;

                           (iv)     Developing positioning and market strategies
consistent with the Marketing Plan, including decisions to seek or include any
new indication, formulation or usage for the Products, such as for life cycle
management;

                           (v)      Developing advertising material and
strategies and promotional materials for the Parties' Sales Representatives for
the Products, designing packaging, and planning and overseeing educational and
professional symposia and speaker and activity programs for the Products in the
US Territory;

                           (vi)     Providing updates on the CSC's activities
and achievements to the JOC; and

                           (vii)    Discussing the prices at which the Products
will be sold to unaffiliated third parties throughout the Territory.

                  (b)      Following a referral to the Senior Executives of the
Parties pursuant to Section 3.7 below, the final decision-making authorities set
out in Sections 3.4(c), (d) and (e) shall apply.

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<PAGE>

                  (c)      Subject to Sections 3.4(d), (e) and (f) below, Pfizer
shall have final decision-making authority with respect to [**]:

                           (i)  activities [**];

                           (ii) [**]

                           (iii) [**] the Products; and

                           (iv) [**], including [**],

                  (d) [**] shall have final decision-making authority with
respect to:

                           (i)  [**] Eyetech shall [**]; and

                           (ii) [**] Eyetech [**]

                  (e) The Parties shall mutually agree upon [**] Products [**]
covered by [**] shall have [**].

                  (f) Notwithstanding the provisions of Section 3.4(c), but
subject to the provisions of Section 3.4(g), in the event that Pfizer closes a
Divestiture Transaction pursuant to Section 17.11, the final decision-making
authority with respect to all US Territory marketing and other commercial
activities for the Products pursuant to this Section 3.4, [**] Eyetech [**]
pursuant to [**] shall thereafter be exercised jointly by the Parties for the
balance of the Co-Promotion Term.

                  (g)      All Marketing Plans shall be consistent with the
terms of this Agreement. If the CSC is unable to reach a decision on any issue
within fifteen (15) Business Days after presentation, either Party may refer the
issue to the JOC for resolution.

         3.5      Manufacturing Subcommittee.

                  (a)      The MSC shall consist of members from each of Eyetech
and Pfizer, each of which shall confirm to the other its designees. The MSC
shall be responsible for:

                           (i)      Overseeing manufacturing activities underway
as of the Effective Date, including formulation development, product
characterization studies, stability studies, and management of clinical supplies
of the Products;

                                       27

<PAGE>

                           (ii)     Overseeing the manufacturing of registration
batches of Product;

                           (iii)    Overseeing process development plans;

                           (iv)     Monitoring worldwide quality assurance
efforts and ensuring that all Products are manufactured in accordance with the
Parties' quality standards;

                           (v)      Overseeing supply relationships with any
third party manufacturers;

                           (vi)     Subject to Section 4.1(c), review of the CMC
section of the NDA for each Product, provided that the time period for reviewing
any such CMC section shall, notwithstanding the provisions of Section 4.1(c), be
thirty (30) days from the date on which Eyetech, through the CDRSC, provides
Pfizer with a draft of the NDA pursuant to Section 4.1(c);

                           (vii)    Overseeing manufacture of the Products;

                           (viii)   Reviewing and approving Specifications for
purposes of the NDA and for Launch;

                           (ix)     Commencing and overseeing any new
manufacturing activities, including Product manufacturing process validation
prior to NDA approval and any pre-approval inspection of the Product
manufacturing subcontractors;

                           (x)      Coordinating with the CSC and CDRSC as
appropriate;

                           (xi)     Preparation for FDA inspections and ensuring
adherence to compliance standards;

                           (xii)    Evaluating the forecasts provided in each
Marketing Plan as well as inventory levels for the Product and future logistic
strategies and capacity planning;

                                       28

<PAGE>

                           (xiii)   Reviewing quality-related issues concerning
the Product or any component thereof; and

                           (xiv)    Providing updates on the MSC's activities
and achievements to the JOC.

                  (b)      If the MSC is unable to reach a decision on any issue
within fifteen (15) Business Days after presentation, either Party may refer the
issue to the JOC for resolution. Following a referral to the Senior Executives
of the Parties pursuant to Section 3.7 below, [**]shall have final
decision-making authority with respect to [**]; provided that:

                           (i)      Pfizer shall [**] any agreement [**] entered
into [**] (ii) [**] Pfizer [**] and/or [**] that otherwise would [**], and
Pfizer [**] pursuant to this Section 3.5 [**],

                           (iii)    [**] Pfizer [**] pursuant to Section 17.11,
[**],

                           (iv)     [**] the Parties, and

              (v)    [**] all Products [**].

3.6 Joint Operating Committee.

                  (a)      The Joint Operating Committee ("JOC") shall consist
of an equal number of members from each of Eyetech and Pfizer. Each of Eyetech
and Pfizer shall confirm to the other its designees. At least one of Pfizer's
designees shall be the Vice President in Pfizer's Pharmaceuticals Group with
global responsibility for the therapeutic area covering the Products. The JOC
shall address all of the significant and strategic issues within the purview of
the various subcommittees, and shall be responsible for resolving any issues
referred by the subcommittees. The JOC will be presented with updates on the
activities and achievements of the subcommittees. All decisions of the JOC will
be unanimous votes of the co-chairpersons.

                                       29

<PAGE>

                  (b)      If the JOC is unable to resolve any issue within ten
(10) Business Days after presentation, either Party may refer the issue to the
Senior Executives for resolution pursuant to Section 3.7.

         3.7      Deadlocks. If for any reason the JOC cannot resolve any matter
properly referred to it, either Party may refer the matter to the Senior
Executives for resolution. If after discussing the matter in good faith and
attempting to find a mutually satisfactory resolution to the issue, the Senior
Executives fail to come to consensus within five (5) Business Days of the date
on which the matter is referred to the Senior Executives, the provisions of
Sections 3.3(d), 3.4(b), and 3.5(b), as applicable, shall apply and resolutions
reached through such provisions shall be binding on the Parties; provided that
such decisions are made in good faith and are consistent with the provisions of
this Agreement.

         3.8      Limitation on Decision-Making Authority. Notwithstanding
anything to the contrary, none of the committees or subcommittees contemplated
by this Article 3 nor any Senior Executive pursuant to this Article 3 shall be
entitled to determine any matters for which: (a) one or more of the Parties is
allocated decision-making authority elsewhere in this Agreement; or (b) such
determination would violate or permit the violation of any express provision of
this Agreement, including, without limitation, the provisions of Sections
3.3(f), 3.3(g), 3.3(h), 3.4(e) and 3.5(b) that provide explicitly for mutual or
joint decision-making; or (c) this Agreement provides that neither Party shall
have final decision-making authority or provides that a decision shall not be
made without the approval or consent of a particular Party.

                                       30

<PAGE>

                                   ARTICLE 4

                         CLINICAL AND REGULATORY MATTERS

         4.1      Clinical and Regulatory Matters in the US Territory. This
Section 4.1 shall apply to clinical and regulatory matters relating to Products
in the US Territory.

                  (a)      Subject to Section 3.3, [**]FDA for the Products [**]
for each of the Products.

                  (b)      All NDAs and Approvals within the US Territory
relating to the Products shall be the property of Eyetech and held in the name
of Eyetech or its designated Affiliates. Eyetech's designated representative
shall serve as the designated regulatory official for Products in the US
Territory for purposes of receiving communications from the FDA.

                  (c)      Eyetech will provide Pfizer with copies, which copies
may be in draft form, of the following submissions to the FDA through the CDRSC.
If reasonably practicable, Eyetech will provide Pfizer with such copies at least
fifteen (15) days prior to planned submission to the FDA by Eyetech, whereupon
Pfizer shall provide comments to Eyetech regarding such submission at least ten
(10) days prior to such planned submission, and, Eyetech shall reasonably
consider the comments given by Pfizer prior to making such submission:

                           (i)      all annual reports regarding a Product prior
to First Approval of such Product, including without limitation the annual
reports required under 21 C.F.R. 312.33 as it may be amended; and

                           (ii)     all other filings that are not subject to a
deadline imposed by the Act of less than twenty-one (21) days after discovery of
an event that triggers the filing requirement and that are not otherwise
required to be jointly agreed upon pursuant to Section 4.1(d).

                                       31

<PAGE>

                  (d)      Eyetech shall provide notice to Pfizer within two (2)
Business Days of discovery by Eyetech of any event that triggers an FDA filing
requirement that is subject to a deadline imposed by the Act of less than
twenty-one (21) days after the discovery of such an event. Eyetech shall
promptly provide copies of any correspondence or other submission subject to
this Section 4.1(d) to Pfizer, and the chairpersons of the CDRSC shall discuss
in good faith and on a timely basis determine the most effective and expeditious
means of responding to such FDA filing requirement.

                  (e)      Eyetech shall provide notice to Pfizer of any
additional FDA requirements which FDA may impose with respect to the First
Approval, (including without limitation, additional clinical studies) and of all
FDA inquiries requiring a response within two (2) Business Days of receipt
thereof by Eyetech. Eyetech will promptly provide Pfizer with copies of all
correspondence between Eyetech and FDA and copies of all FDA contact reports
produced by Eyetech.

                  (f)      In connection with Sections 4.1(a), (b) and (c)
above, Eyetech shall provide Pfizer with notice of all meetings, conferences,
and discussions (including without limitation, advisory committee meetings and
any other meeting of experts convened by FDA concerning any topic relevant to
the Products) scheduled with FDA concerning any pending NDA or other regulatory
matters relating to the Products within two (2) Business Days after Eyetech
receives notice of the scheduling of such meeting, conference, or discussion.
Pfizer shall be entitled to have reasonable representation present at all such
meetings. Eyetech and Pfizer, through the CDRSC, shall use reasonable efforts to
agree (subject to Section 3.3(f)(i) to the extent applicable) in advance on the
scheduling of such meetings and on the objectives to be

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<PAGE>

accomplished at such meetings, conferences, and discussions and the agenda for
the meetings, conferences, and discussions with FDA.

                  (g)      Each Party shall provide to the other Party, through
the CDRSC, on a timely basis copies of all material pre-clinical and clinical
data compiled in support of an NDA or other regulatory filings in the US
Territory with respect to the Products.

                  (h)      Any decision to initiate a recall or withdrawal of
Product in the US Territory shall be made by the CDRSC. Before the CDRSC
initiates a recall or withdrawal, and upon the request for a recall or
withdrawal by either Party, the Parties shall promptly and in good faith discuss
the reasons therefor. Under no circumstances shall either Party unreasonably
object to a recall or withdrawal requested by the other Party, and neither Party
shall have any right to object to a recall or withdrawal requested by the other
Party for failure of a Product to meet the Specifications, for material safety
concerns or for noncompliance with the Act. In the event of any recall or
withdrawal, Pfizer shall implement any necessary action, with assistance from
Eyetech as reasonably requested by Pfizer.

         4.2      Clinical and Regulatory Matters in the ROW Territory. This
Section 4.2 shall apply to clinical and regulatory matters relating to Products
in the ROW Territory.

                  (a)      After the Effective Date, Pfizer will assume sole
ownership, control of and responsibility for all regulatory filings in the ROW
Territory, and Eyetech shall cooperate with Pfizer in connection with such
filings as reasonably requested by Pfizer and at Pfizer's sole cost and expense.
Prior to Pfizer taking over responsibility for contracting with API Bulk Drug
Substance Supplier(s) and/or Fill and Finish Services Supplier(s) or performing,
either directly or through Affiliates, services that otherwise would be
performed by API Bulk Drug Substance Supplier(s) and/or Fill and Finish Services
Supplier(s) in accordance with Section 6.12, Eyetech

                                       33

<PAGE>

shall be responsible for providing Pfizer with Product samples for use in
connection with regulatory filings relating to Products in the ROW Territory at
Pfizer's sole cost and expense.

                  (b)      All regulatory approvals in the ROW Territory
relating to the Products shall be deemed the property of Pfizer and held in
Pfizer's or its Affiliate's name.

                  (c)      Pfizer's rights under Sections 4.2(a) and (b) above
are subject to the following: Pfizer shall provide Eyetech with notice of all
meetings, conferences, and discussions (including without limitation, any
meeting of experts convened by regulatory authorities concerning any topic
relevant to the Products) scheduled with Governmental Authorities concerning any
material regulatory matters relating to the Products within two (2) Business
Days after the scheduling of such meeting, conference, or discussion. Eyetech
shall be entitled to have reasonable representation present at all such
meetings. In addition, with respect to clinical and regulatory matters in the
ROW Territory, Pfizer shall promptly provide Eyetech with (i) copies of all
pre-clinical and clinical data compiled in support of regulatory filings in the
ROW Territory, (ii) copies of all material regulatory correspondence with EMEA,
as defined in the License Agreement, (or any Governmental Authority in a Major
Country) and with Japanese Governmental Authorities, (iii) advance copies of
material submissions to EMEA (or any Governmental Authority in a Major Country)
and to Japanese Governmental Authorities, and the same opportunity to comment in
advance on such submissions (and to have its comments reasonably taken into
account) as Pfizer is provided with respect to the submissions to FDA under
Section 4.1(c), provided, however, that an inadvertent failure by Pfizer to
submit Eyetech advance copies pursuant to this Section 4.2(c)(iii) shall not be
considered a material breach of this Agreement if Pfizer has implemented
procedures reasonably designed to avoid any such failure and cures any such
failure promptly after its discovery, (iv) notices of any revocations of

                                       34

<PAGE>

Product marketing approvals and any Product recalls, and (v) reasonable
responses to inquiries by Eyetech regarding the regulatory approval and
commercialization processes for each Product in the ROW Territory, including
without limitation reasonable access to Pfizer personnel, documents and files in
connection with such inquiries.

         4.3      Inquiries, Adverse Events, etc.

                  (a)      Eyetech and Pfizer shall be responsible for the
surveillance, receipt, evaluation, and reporting of product complaints and
reports of adverse drug experiences, for the Products in the US Territory and
the ROW Territory, respectively; provided, however, during the term of the
Regulatory Services Agreement, Pfizer shall perform certain of such US Territory
responsibilities on behalf of Eyetech under the terms of the Regulatory Services
Agreement.

                  (b)      Eyetech shall be responsible for promptly
investigating Product complaints and reports of adverse drug experiences and
other required safety information (e.g., PSURs and annual safety reports)
associated with the use of any Product in the US Territory. As to each Product,
Eyetech shall submit reports of all adverse drug experiences associated with the
use of the Product(s) and other required safety information to the FDA in
accordance with applicable Law. Eyetech shall submit a copy of each such report
to Pfizer contemporaneously with its submission of the report to FDA, or in
advance of such submission if, and as, reasonably necessary to permit Pfizer to
comply with legal requirements applicable to it, if practicable.

                  (c)      Pfizer shall promptly investigate Product complaints
and reports of adverse drug experiences and other required safety information
(e.g., PSURs and annual safety reports) associated with the use of any Product
in the ROW Territory. As to each Product, Pfizer shall submit reports of all
adverse drug experiences associated with the use of the Product(s) and other
required safety information to the applicable Governmental Authorities in the
ROW

                                       35

<PAGE>

Territory in accordance with applicable Law. Pfizer shall submit a copy of each
such report to Eyetech contemporaneously with its submission of the report to
the applicable Governmental Authority in the ROW Territory, or in advance of
such submission if, and as, reasonably necessary to permit Eyetech to comply
with legal requirements applicable to it, if practicable.

                  (d)      Eyetech shall have the sole responsibility for
revising the Product labeling for the US Territory, and Pfizer for the ROW
Territory, as needed, to adequately warn of the potential risks identified by
reports of adverse drug experiences associated with the use of the Product and
from Product complaints. In addition, the Parties agree to jointly develop
additional written procedures including the mechanics for the surveillance,
receipt, evaluation, and reporting of Product complaints and adverse drug
experiences, including the possible maintenance of a worldwide safety database,
in accordance with this Article 4 and subject to the oversight of the CDRSC.

                  (e)      Each Party shall notify the other Party within two
(2) Business Days after it receives information about the initiation of any
investigation, review or inquiry by FDA or other Governmental Authority
concerning the distribution, promotion or sale of the Product, not otherwise
described above.

         4.4      Pfizer's Performance of Regulatory Services Agreement
Obligations. During the term of the Regulatory Services Agreement, all of
Eyetech's regulatory obligations under this Agreement are subject to Pfizer's
performance of its obligations under the Regulatory Services Agreement to the
extent Eyetech's performance of Eyetech's obligations depends on Pfizer's
performance of Pfizer's obligations under the Regulatory Services Agreement.

                                       36

<PAGE>

                                   ARTICLE 5

                               PRODUCT DEVELOPMENT

         5.1      Development Plan and Budget. The CDRSC shall develop an annual
development plan, which shall include preclinical and clinical plans and a
budget (a "Development Plan") in respect of the Products consistent with the
terms of this Agreement for each Year during the Co-Promotion Term. The CDRSC
shall meet to discuss the first Development Plan within ninety (90) days after
the Execution Date. A description of the overall development programs for
development of the AMD Product and DME Product is attached as Exhibit 5.1(a),
and a summary of the budgets for agreed upon Development Costs for such programs
(respectively, the "AMD Agreed Development Costs" and the "DME Agreed
Development Costs") are attached as Exhibit 5.1(b) to this Agreement. Each
annual Development Plan may be updated throughout the Year as deemed appropriate
by the CDRSC. Cumulative Development Costs for each of the AMD Product and DME
Product shall not exceed the AMD Agreed Development Costs and the DME Agreed
Development Costs, respectively, for such Products absent mutual consent of the
Parties. The Parties' respective obligations with respect to Development Costs
shall be as set forth in Section 8.1, provided that, unless otherwise agreed by
the Parties, neither Party shall be obligated to pay for any Development Costs
in excess of the AMD Agreed Development Costs or the DME Agreed Development
Costs, respectively, except to the extent a Party exercises its final
decision-making authority in accordance with Article 3 to approve such excess
Development Costs over the objection of the other Party or otherwise
unilaterally incurs such excess Development Costs, in which case the Party
exercising such final decision-making authority or unilaterally incurring excess
Development Costs shall be solely responsible for such excess Development Costs.
The Parties

                                       37

<PAGE>

acknowledge that the budgets set forth in Exhibit 5.1(b) do not cover
preclinical Development Costs for periods after the end of 2003 and do not cover
Development Costs for manufacturing process development and optimization. With
respect to such Development Costs not covered by the budgets set forth in
Exhibit 5.1(b), the Parties shall discuss reasonably necessary preclinical
Development Costs for subsequent periods and Development Costs for manufacturing
process development and optimization, and amend Exhibit 5.1(b) to cover such
additional Development Costs.

         5.2      AMD Product and DME Product Development. Each of the Parties
shall, during the Co-Promotion Term, use Commercially Reasonable Efforts to
develop and obtain Approvals for at least one AMD Product and one DME Product as
provided in this Agreement. In the event that a party fails to exercise such
Commercially Reasonable Efforts, such Party's sole liability and the other
Party's sole remedy for such failure shall be termination of this Agreement in
accordance with Section 13.2.

         5.3      Development of Products for Additional Indications in the
Field. At the request of either Party, the Parties shall in good faith meet and
discuss jointly developing Additional Developed Products where preclinical
and/or clinical results provide a reasonable basis for pursuing such additional
development or the pursuit of such additional development is otherwise
potentially commercially attractive. If the Parties agree to pursue such
additional development, the Parties shall amend the applicable Development
Plan(s) accordingly. If the Parties do not agree to pursue such additional
development, either Party shall have the right to pursue development of such
Additional Developed Products at its sole expense, subject to the other Party's
rights under this Agreement with respect to the Co-Promotion of Products
(including Additional Developed Products); provided, however, that such
additional development would

                                       38

<PAGE>

not, based on the best available scientific evidence, be reasonably likely to
have a materially adverse effect on the Co-Promotion of the Products.

                                   ARTICLE 6

                       LAUNCH, CO-PROMOTION AND DETAILING

         6.1      Co-Promotion of Products. Eyetech and Pfizer shall be jointly
responsible for the Co-Promotion of Products in the US Territory, with each
Party participating (except as otherwise expressly provided in this Agreement)
in all types of marketing activity in the US Territory. Each of the Parties
shall Co-Promote the Products in the US Territory during the Co-Promotion Term
in accordance with the terms of this Agreement and the applicable Marketing
Plan, and in compliance with all Laws. In conducting Co-Promotion activities,
each Party shall use Commercially Reasonable Efforts to Co-Promote the sale of
the Products in the US Territory. In the event that a Party fails to exercise
such Commercially Reasonable Efforts, such Party's sole liability and the other
Party's sole remedy for such failure shall be (a) termination of this Agreement
in accordance with Section 13.2 and (b) if applicable to such failure, the
remedies set forth in Section 6.5 below. All aspects of each Marketing Plan will
be determined pursuant to the committee system set forth in Article 3.

         6.2      Marketing Plan and Budget.

                  (a)      The CSC shall, subject to the provisions of Sections
3.4(c), (d), (e) and (f), develop a Marketing Plan (a "Marketing Plan") and a
marketing budget (a "Co-Promotion Budget") for the period from the Effective
Date through Launch of the first Product in the US Territory and for each Year
thereafter during the Co-Promotion Term consistent with Exhibit 6.2 and the
other terms of this Agreement. The first Marketing Plan shall be a pre-Launch
Marketing Plan, such Marketing Plan to be as approved by the JOC within six (6)
months of the

                                       39

<PAGE>

Effective Date (the "Pre-Launch Marketing Plan"). The Pre-Launch Marketing Plan
shall contain a pre-Launch Co-Promotion Budget covering the period of time from
the Effective Date through the Launch of the first Product in the US Territory
of up to $[**] or such higher amount as is agreed between the Parties. The
pre-Launch Co-Promotion Budget shall not exceed $[**] unless otherwise agreed by
both Parties, and neither Party's election to withhold such agreement shall be
subject to the other Party's decision-making authority. Neither Party shall
engage in any Co-Promotion activities except as provided in the applicable
Marketing Plan. Subsequent annual Marketing Plans will describe the plan for
commercialization of the Products in the US Territory, including: (a) general
strategies for the Detailing and marketing of the Products and allocation of
responsibilities for marketing activities; (b) Detail Requirements and sampling
activities, if any; (c) market and sales forecasts; (d) pricing and discounting
analysis; (e) advertising, public relations and other promotional programs,
including professional symposia and speaker and activity programs to be used in
the Co-Promotion of the Products; and (f) [**]. Each Marketing Plan and the
Co-Promotion Budget may, subject to the provisions of Sections 3.4(c), (d), (e)
and (f), be updated from time to time as deemed appropriate by the CSC.

                  (b)      Exhibit 5.1(b) also includes [**], which Product
Studies will be performed absent mutual agreement by the Parties to the
contrary. [**] these [**] of Products, [**].

         6.3      Detailing. The Parties shall be responsible for performing the
Detail Requirements specified in each then-current Marketing Plan.

         6.4      Detailing Reports. Each Party shall provide the other Party
and the CSC with a report as soon as practicable but in no event later than
forty-five (45) days following the end of each Quarter during the Co-Promotion
Term setting forth, in such detail and form as the Parties shall agree, the
number of Details made by such Party's Sales Representatives of Products in the

                                       40

<PAGE>

US Territory during such Quarter (each, a "Detailing Report"), provided,
however, that the Detailing Report for the fourth such Quarter in each Year
shall be cumulative and reflect the number of Details made by such Party's
respective Sales Representatives in the US Territory during such Year. Eyetech
covenants that it shall develop an internal system for the purpose of reporting
the number of Details of its Sales Representatives, and that it shall have such
system implemented by the time it begins Detailing the Products.

         6.5      Detail Shortfalls.

                  (a)      In the event that either Party fails to perform (such
Party, a "Shortfall Party") at least [**] percent ([**]%) of its Detail
Requirement in any Year as reported pursuant to Section 6.4 or verified pursuant
to Section 9.3, the Shortfall Party shall pay to the other Party as liquidated
damages an amount equal to the Detail Cost (as hereinafter defined), multiplied
by the applicable factor set forth below (the "Shortfall Factor") multiplied by
the total number of Details in the shortfall (the Detail Cost, multiplied by the
number of Details in the shortfall, multiplied by the Shortfall Factor, the
"Detail Shortfall Payment Amount"), on an incremental basis as set forth below:

                                       41

<PAGE>

<TABLE>
<CAPTION>
-----------------------------------------------------------------------------------------
                                                                                Shortfall
                                            Detail Shortfall Level                Factor
-----------------------------------------------------------------------------------------
<S>                                       <C>                                   <C>
For such portion of shortfall which is: > or = [**]% but < [**]% of Detail         [**]
                                         Requirement
-----------------------------------------------------------------------------------------
For such portion of shortfall which is: > or = [**]% but < [**]% of Detail         [**]
                                         Requirement
-----------------------------------------------------------------------------------------
For such portion of shortfall which is: < [**]% of Detail Requirement              [**]
-----------------------------------------------------------------------------------------
</TABLE>

For purposes of this Section 6.5, "Detail Cost" means $[**]. If a Party wishes
to verify the Details performed by the other Party in any Year, such Party shall
give notice to the other Party that the notifying Party wishes to verify Details
pursuant to Section 9.3 within forty-five (45) days after receipt of the other
Party's last Detailing Report set forth in Section 6.4 for such Year.

                  (b)      With respect to any Year in which only one of the
Parties was a Shortfall Party, the Shortfall Party shall, within one-hundred
twenty (120) days after the end of such Year (or within thirty (30) days after
completion of any verification(s) of Details pursuant to Section 9.3 conducted
pursuant to Section 6.5(a) for such Year, if such verification(s) have not been
completed within ninety (90) days after the end of such Year), pay the Detail
Shortfall Payment Amount to the other Party.

                  (c)      With respect to any Year in which both Parties are
Shortfall Parties, the Party having performed the highest percentage of its
Detail Requirement in such Year (the "Highest Performing Party") shall be deemed
not to be a Shortfall Party and the percentage of such Party's Detail
Requirement performed by such Party shall be deemed to equal [**] percent
([**]%) of that Party's Detail Requirement in such Year. The other Party shall
continue to be required to pay a Detail Shortfall Payment Amount in accordance
with Section 6.5(b); provided, however, such Detail Shortfall Payment Amount to
be paid by such other Party shall be reduced

                                       42

<PAGE>

by (i) multiplying such other Party's Detail Requirement for such Year by the
percentage of the Highest Performing Party's Detail Requirement actually
performed by the Highest Performing Party during such Year and (ii)
recalculating such other Party's Detail Shortfall Payment Amount using the
reduced Detail Requirement for such other Party calculated in accordance with
the immediately preceding clause (i).

                  (d)      In the event that either Party fails to perform at
least [**] percent ([**]%) of its aggregate Detail Requirement (such Party, the
"Detail Breaching Party") for [**] during the Co-Promotion Term (a "Detail
Shortfall Period"), then:

                           (i)      If Pfizer is the Detail Breaching Party,
Eyetech shall have the right, in addition to the remedies provided for in
Sections 6.5(b) and 6.5(c) above, exercisable upon notice to Pfizer given within
ninety (90) days after the end of such Detail Shortfall Period (or within thirty
(30) days after completion of any verification of Pfizer's Details pursuant to
Section 9.3 conducted at Eyetech's request pursuant to Section 6.5(a) for such
Detail Shortfall Period, if such verification has not been completed within
sixty (60) days after the end of such Detail Shortfall Period), such notice to
be effective ninety (90) days after the date of such notice to Pfizer (or thirty
(30) days after completion of any verification of Pfizer's Details for such
Detail Shortfall Period requested by Eyetech, if later), to terminate this
Agreement; and

                           (ii)     If Eyetech is the Detail Breaching Party,
Pfizer shall have the right, in addition to the remedies provided for in
Sections 6.5(b) and 6.5(c) above, exercisable upon notice to Eyetech given
within ninety (90) days after the end of such Detail Shortfall Period (or within
thirty (30) days after completion of any verification of Eyetech's Details
pursuant to Section 9.3 conducted at Pfizer's request pursuant to Section 6.5(a)
for such Detail Shortfall Period, if such verification has not been completed
within sixty (60) days after the end of such

                                       43

<PAGE>

Detail Shortfall Period), such notice to be effective ninety (90) days after the
date of such notice to Eyetech (or thirty (30) days after completion of any
verification of Eyetech's Details for such Detail Shortfall Period requested by
Pfizer, if later), to elect to adjust, for the balance of the Co-Promotion Term,
the percentage of Net Sales that Pfizer would be entitled to receive under
Section 8.6(a), and the percentage of costs and expenses included in the
calculation of net payment amounts in Section 8.6(c) for which Pfizer would be
responsible would be increased from [**] percent ([**]%) to [**] percent
([**]%), Eyetech's corresponding percentage would be decreased from [**]percent
([**]%) to [**] percent ([**]%) and Eyetech would not have any further Detailing
responsibilities under this Agreement (the "Elective Remedy"); and

                           (iii)    The Parties understand and agree that the
Detail Shortfall Payment Amount shall be paid as liquidated damages and not as a
penalty and that such sum represents a genuine pre-estimate of the loss the
Parties believe would be suffered as a result of Detail shortfalls. In the event
of any Detail shortfall under Section 6.5, the remedies and compensation as
provided herein shall govern, and neither Party shall have any further claim for
breach of this Agreement on account of such Detail shortfall; provided that
nothing in this sentence shall preclude either Party from using a Detail
shortfall as a basis for termination of this Agreement for breach by the other
Party of such other Party's obligations under Section 6.1; and provided that a
failure to give or election not to give a notice by a Party prior to a deadline
set forth in Section 6.5(d)(i) or 6.5(d)(ii) with respect to a Detail shortfall
during any Detail Shortfall Period shall not constitute a waiver by such Party
with respect to the remedies and compensation under this Section 6.5 with
respect to a Detail shortfall during any subsequent Detail Shortfall Period.

         6.6      Sales Force Responsibilities. Each Party shall be solely
responsible for all costs and expenses incurred in providing the personnel
necessary to provide the services to be

                                       44

<PAGE>

performed by it as described in this Article 6. During the Co-Promotion Term,
Pfizer shall, in a manner determined at Pfizer's sole reasonable discretion, (a)
maintain and support a professional sales force in the US Territory; and (b)
ensure that sales of the Product will constitute a factor in the variable
compensation of Pfizer's Sales Representatives.

         6.7      Product Information. During the Co-Promotion Term, each Party
will provide the other with all material information relevant to the Detailing
and promotion of the Product within a reasonable time after such information
becomes known to the Party, provided such information is not received under a
secrecy obligation.

         6.8      Orders. Eyetech shall, subject to Pfizer's performance of
Pfizer's obligations under the Distribution Agreement, process and fulfill all
orders for Products from customers in the US Territory. Except as otherwise
provided in the Distribution Agreement, in the event that an order for Products
from a customer in the US Territory is received by Pfizer, Pfizer shall promptly
forward such order to Eyetech for processing and fulfillment.

         6.9      Audit. The number of Details shall be subject to external
audit as provided in Article 9.

         6.10     Third Party Reports. From time to time during the term hereof
the CSC shall agree upon the third party reports (such as those from IMS), to
the extent permitted by such third party, which the Parties wish to receive in
connection with the Co-Promotion of the Products (and the determinations to be
made under Section 6.2 with respect to the Marketing Plan and Co-Promotion
Budgets). The expenses of such reports shall be Marketing Expenses.

         6.11     Medical Claims. Neither Party shall make any medical claim for
the Products beyond the scope of the relevant regulatory approval(s) then in
effect for the Products; provided that, both Parties may distribute any
information concerning the Products or their use, including

                                       45

<PAGE>

but not limited to scientific articles, reference publications, and healthcare
economic information, in accordance with applicable Laws and subject to the
oversight of the CSC.

         6.12     Manufacturing.

                  (a)      After the Effective Date, Eyetech shall use
commercially reasonable efforts to enter into an agreement with an API Bulk Drug
Substance Supplier to supply the Parties with a supply of the active
pharmaceutical ingredient for the Products in the Territory. The selection of
such API Bulk Drug Substance Supplier and the terms and conditions of the
agreement to be entered into with the API Bulk Drug Substance Supplier shall be
subject to approval by the MSC. In addition, prior to the Execution Date,
Eyetech entered into the agreements set forth in Exhibit 6.12(a) with respect to
the supply of Products for clinical trials, and such agreements are hereby
deemed approved by the MSC. [**] shall be responsible for day-to-day management
of such API Bulk Drug Substance Supplier on behalf of the Parties.

                  (b)      After the Effective Date, Eyetech shall also use
commercially reasonable efforts to enter into an agreement with a Fill and
Finish Services Supplier to provide fill and finish services for the Products in
the US Territory. The selection of such Fill and Finish Services Supplier and
the terms and conditions of the agreement to be entered into with the Fill and
Finish Services Supplier shall be subject to approval by the MSC. [**] shall be
responsible for day-to-day management of such Fill and Finish Services Supplier
on behalf of the Parties.

                  (c)      The MSC shall not take any action or direct Eyetech
to take any action that would result in a breach of any agreement set forth on
Exhibit 6.12(a), or of any agreement between Eyetech and an API Bulk Drug
Substance Supplier or between Eyetech and a Fill and Finish Services Supplier,
including without limitation any minimum purchase obligation or non-cancelable
order obligation, entered into by Eyetech and approved by the MSC.

                                       46

<PAGE>

                  (d)      Subject to the provisions of Sections 2.8 and
6.12(c), the MSC may decide to have Pfizer (i) enter into agreement(s) with API
Bulk Drug Substance Supplier(s) and/or Fill and Finish Services Supplier(s)
and/or (ii) supply active pharmaceutical ingredient and/or fill and finish
services for the Products, in either case to replace the agreement(s) referred
to in Sections 6.12(a) and/or 6.12(b) or to provide a second source of supply
for active pharmaceutical ingredient and/or fill and finish services for the
Products; provided that the terms and conditions of any such agreements or
arrangements involving Pfizer shall be subject to Eyetech's prior approval and,
if such agreements or arrangements involving Pfizer relate to the supply of
active pharmaceutical ingredient and/or fill and finish services for the
Products in the US Territory, such agreements or arrangements shall be entered
into pursuant to agreements between Eyetech and Pfizer for such supply on terms
to be mutually agreed by the Parties; provided further that any such agreements
or arrangements shall be structured so that Eyetech acquires and maintains title
to all inventory of Products supplied for sale in the US Territory. From and
after such time, if any, as responsibility for manufacturing the Products has
been transitioned to Pfizer, Pfizer shall use Commercially Reasonable Efforts to
manufacture and supply sufficient quantities of the Products to enable Eyetech
to respond on a timely basis to all customer demand for Product in the US
Territory.

                  (e)      During any period in which Eyetech is the contracting
Party with API Bulk Drug Substance Supplier(s), Eyetech shall supply active
pharmaceutical ingredient for the Products to be sold by Pfizer in the ROW
Territory in accordance with terms and conditions to be mutually agreed by the
Parties, including resale pricing from Eyetech to Pfizer equal to Eyetech's
Manufacturing Costs incurred in providing such supply. Such terms and conditions
shall provide for an equitable allocation of supply between the US Territory and
the ROW

                                       47

<PAGE>

Territory in the event that the supply of active pharmaceutical ingredient for
the Products at any time is not sufficient to meet worldwide demand, such
allocation to be based on the orders placed by the Parties during the six-month
period preceding the shortfall in supply or, if sales have not been made in both
the US Territory and the ROW Territory during such preceding six-month period,
on the Parties' reasonable sales forecasts for the period affected by such
shortfall. In addition, such terms and conditions shall impose on Pfizer all of
Eyetech's obligations to the API Bulk Drug Substance Supplier(s) with respect to
the active pharmaceutical bulk drug substance so supplied by Eyetech to Pfizer
for the ROW Territory, shall be structured so that Eyetech shall have no
obligations to such API Bulk Drug Substance Supplier(s) with respect to the
active pharmaceutical bulk drug substance so supplied by Eyetech to Pfizer for
the ROW Territory greater than Pfizer's obligations to Eyetech with respect to
the active pharmaceutical bulk drug substance so supplied by Eyetech to Pfizer
for the ROW Territory, and shall not require Eyetech to give any warranties or
otherwise assume any liability for the performance of the API Bulk Drug
Substance Supplier(s) or for any active pharmaceutical ingredient bulk drug
substance so supplied by Eyetech to Pfizer.

                  (f)      Following the Effective Date, Eyetech shall, at least
thirty (30) days prior to the commencement of each Quarter commencing prior to
the first Launch of a Product in the US Territory in which Eyetech anticipates
incurring Manufacturing Costs for pre-Launch inventory of Products intended for
sale in the US Territory, prepare and deliver to Pfizer a statement of such
Manufacturing Costs (the "Manufacturing Costs Statement") projected to be
incurred by Eyetech during such Quarter. Within fifteen (15) days after
Eyetech's delivery of such statement of projected pre-Launch inventory
Manufacturing Costs, Pfizer shall pay Eyetech [**] percent ([**]%) of such
projected Manufacturing Costs for inventory, projected for sale in

                                       48

<PAGE>

the US Territory if the first Launch of a Product is expected to occur in the
US Territory and no substantially concurrent Launch of a Product in the ROW
Territory is expected. Each Manufacturing Costs Statement shall contain an
adjustment as necessary to reflect any variance between the projected
Manufacturing Costs included by Eyetech in prior Manufacturing Cost Statements
and Eyetech's actual Manufacturing Costs for pre-Launch inventory of Products
projected for sale in the US Territory. For the avoidance of doubt, Eyetech
shall not have any financial responsibility for Manufacturing Costs for any
inventory of Products projected for sale in the ROW Territory, and Pfizer shall
be solely responsible for making all necessary payments for any such inventory.
Notwithstanding the foregoing provisions of this Section 6.12(f), the first
Quarter for which the Parties shall provide the statements of projected
pre-Launch inventory Manufacturing Costs shall be the second Quarter of 2003,
and adjustments shall be included the Parties' first statements of such
projected Manufacturing Costs for any pre-Launch inventory Manufacturing Costs
incurred by the Parties between the Execution Date and the end of the first
Quarter of 2003 as if such Manufacturing Costs were variances over previously
projected pre-Launch inventory Manufacturing Costs.

                  (g)      In the event an API Bulk Drug Substance Supplier or
Fill and Finish Services Supplier requires that Eyetech pay for capital
expenditures required for the manufacture of the Products other than as part of
the per-unit purchase price of the Products, Pfizer shall pay [**] percent
([**]%) of such expenditures and Eyetech shall pay [**] percent ([**]%) of such
expenditures; provided that any agreement obligating Eyetech to pay for such
capital expenditures shall be subject to the approval of the MSC as set forth in
Sections 6.12(a) and 6.12(b). Pfizer shall reimburse Eyetech for Pfizer's share
of all such expenditures incurred by Eyetech within thirty (30) days after
receiving any invoice from Eyetech for such expenditures.

                                       49

<PAGE>

                  (h)      The Parties shall cooperate, through the MSC, to
obtain mutually agreeable second sources for the supply of active pharmaceutical
ingredient bulk drug substance and fill and finish services for the Products.
The Parties shall also cooperate, through the MSC, to optimize, or cause the API
Bulk Drug Substance Supplier(s) and/or Fill and Finish Services Supplier(s) to
optimize, the manufacturing process used to manufacture the Products in order to
achieve improved quality and efficiency.

                  (i)      Subject to the provisions of Sections 6.12(f) and
6.12(g), the Parties' respective obligations with respect to Manufacturing Costs
relating to Products manufactured for sale in the US Territory shall be as set
forth in Section 8.3.

         6.13     Customer Support. Eyetech will, subject to Pfizer's
performance of its obligations under the Distribution Agreement, be responsible
for distribution and invoicing of Products in the US Territory and providing
customer service representatives to handle customer inquiries and service
related to the Products. The number of these customer service representatives
will be sufficient to reasonably handle calls and inquiries related to the
Products. Such distribution, invoicing and customer service expenses shall be
Marketing Expenses.

                                   ARTICLE 7

                               PAYMENT PROVISIONS

         7.1      Payment Currency. All amounts due under this Agreement shall
be paid to the designated Party in United States dollars.

         7.2      Payments. All payments under this Agreement shall be made on
or before the due date by electronic transfer in immediately available funds to
the respective account designated in writing by each Party at least two (2)
Business Days before the payment is due. Pfizer shall notify Eyetech's
Treasurer, or such other Eyetech representative as Eyetech's treasurer shall

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designate in writing, by facsimile transmission as to the date and amount of any
payment that Pfizer shall make at least two (2) Business Days prior to such
transfer. Eyetech shall notify Pfizer's treasurer, or such other Pfizer
representative as Pfizer's treasurer shall designate in writing, by facsimile
transmission as to the date and amount of any payment that Eyetech shall make at
least two (2) Business Days prior to such transfer. All payments under this
Agreement shall bear interest from the date due until paid at a rate equal to
the prime rate of Citibank, NA as announced on the date such payment was due
plus three percent (3%), compounded on a calendar quarterly basis. In addition,
the Party liable for late payment shall reimburse the other Party for all
reasonable costs and expenses, including without limitation reasonable
attorneys' fees and legal expenses, incurred in the collection of late payments.

                                   ARTICLE 8

                        EXPENSE SHARING AND COMPENSATION

         8.1      Sharing of Development Costs.

                  (a)      Subject to Sections 8.1(b) and (c), Pfizer shall pay
[**] percent ([**]%) of all Development Costs and Eyetech shall pay [**] percent
([**]%) of all Development Costs (including Development Costs incurred for
clinical studies performed to support regulatory filings in both the US
Territory and the ROW Territory).

                  (b)      Subject to Section 8.1(e), with respect to
Development Costs incurred for clinical studies performed solely to support a
regulatory filing, or solely as a condition of receiving regulatory approval, in
a country in the ROW Territory:

                           (i)      Pfizer shall pay [**]% and Eyetech shall pay
[**]% of the first $[**] of such Development Costs; and

                           (ii)     [**] pay [**] of such Development Costs in
excess of $[**].

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<PAGE>

                  (c)      [**] pay [**] percent ([**]%) of Development Costs
incurred for clinical studies performed solely to support a regulatory filing in
the US Territory, or solely as a condition of receiving regulatory approval in
the US Territory.

                  (d)      Following the Effective Date, (i) Eyetech shall, at
least thirty (30) days prior to the commencement of each Quarter in which
Eyetech anticipates incurring Development Costs, prepare and deliver to Pfizer a
statement of Development Costs projected to be incurred by Eyetech during such
Quarter in accordance with Section 5.1 above and the annual Development Plan
applicable to such Quarter and (ii) Pfizer shall, at least thirty (30) days
prior to the commencement of each Quarter in which Pfizer anticipates incurring
Development Costs, prepare and deliver to Eyetech a statement of Development
Costs projected to be incurred by Pfizer during such Quarter in accordance with
Section 5.1 above and the annual Development Plan applicable to such Quarter.
Each Party shall include in such statement an adjustment for variances between
projected Development Costs included in prior such statements delivered by such
Party and actual Development Costs incurred by such Party in the periods covered
by such prior statements. After delivery by each Party of its statement of
projected Development Costs, Eyetech shall, at least fifteen (15) days prior to
the commencement of such Quarter, prepare and deliver to Pfizer a combined
statement of projected Development Costs to be incurred by both Parties for such
Quarter, which shall provide a net amount to be advanced by the Party projected
to incur less than its share of the combined Development Costs for such Quarter
to the Party projected to incur more than its share of such combined Development
Costs, such net amount to equal the difference between each Party's share of the
combined Development Costs for such Quarter as determined in accordance with
Sections 8.1(a), (b) and (c) and the Development Cost amount such Party is
projected to incur during such Quarter. Within fifteen (15) days after

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Eyetech's delivery of such combined statement of projected Development Costs,
the Party required to advance the net amount reflected in such combined
statement shall pay the other Party such net amount. Notwithstanding the
foregoing provisions of this Section 8.1(e), the first Quarter for which the
Parties shall provide the statements of projected Development Costs shall be the
second Quarter of 2003, and adjustments shall be included the Parties' first
statements of projected Development Costs for any Development Costs incurred by
the Parties between December 1, 2002 and the end of the first Quarter of 2003 as
if such Development Costs were variances over previously projected Development
Costs.

                  (e)      For purposes of Section 8.1(b) above, a clinical
study shall not be treated as performed solely to support a regulatory filing in
one or more countries in the ROW Territory if such clinical study is also
performed to support a regulatory filing in the US Territory; provided, however,
that the mere fact that a clinical study performed to support a regulatory
filing in the ROW Territory is required to be filed with FDA (pursuant to FDA
regulations requiring that any clinical study conducted anywhere in the world be
filed with FDA regardless of whether such clinical study is performed as a
condition to receiving regulatory approval from FDA), does not in and of itself
mean that such clinical study is also performed to support a regulatory filing
in the US Territory.

         8.2      Responsibility for Regulatory Costs. [**] be responsible for
[**] of all Regulatory Costs. Such Regulatory Costs shall be reflected in the
Parties' Quarterly Expense Reports pursuant to Section 8.6(b). [**] shall be
solely responsible for all Out-of-Pocket Costs and other costs solely related to
making or supporting regulatory filings in the ROW Territory.

         8.3      Responsibility for Cost of Goods Sold. [**] be responsible for
[**] of all Cost of Goods Sold for Products sold in the US Territory. Such Cost
of Goods Sold shall be reflected in

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the Parties' Quarterly Expense Reports pursuant to Section 8.6(b); provided that
Pfizer and Eyetech shall each receive a credit (the "Inventory Build Credit")
against the amount otherwise to be paid by it with respect to Cost of Goods Sold
pursuant to this Section 8.3 equal to the lesser of (a) its share of the Cost of
Goods Sold for such Quarter and (b) the previously un-credited portion of its
Funded Inventory Build Costs.

         8.4      Responsibility for Marketing Expenses. [**] responsible for
[**] of all Marketing Expenses for the Products in the US Territory. Such
Marketing Expenses shall be reflected in the Parties' Quarterly Expense Reports
pursuant to Section 8.6(b). Pfizer shall be solely responsible for all
Out-of-Pocket Costs and other costs solely related to the marketing and
promotion of Products in the ROW Territory. In the event that any Out-of-Pocket
Costs related to both the marketing and promotion of Products in the US
Territory and the marketing and promotion of Products in the ROW Territory are
incurred by either Party, the Parties shall in good faith discuss an equitable
sharing of such Out-of-Pocket Costs.

         8.5      Net Sales Reports. Subject to Pfizer's performance of its
obligations under the Distribution Agreement, Eyetech shall deliver
electronically to Pfizer daily (if practicable, but in any event not less than
weekly) a report of gross sales of the Products in the US Territory on a daily
(if practicable, but in any event not less than weekly) and Year-to-date basis.

         8.6      Quarterly Reconciliation of Net Sales and Expenses.

                  (a)      During the Co-Promotion Term and subject to the terms
and conditions hereof, Eyetech shall pay to Pfizer [**] percent ([**]%) of Net
Sales in the US Territory. Payments by Eyetech to Pfizer of such amounts shall
be made in accordance with the reconciliation procedures set forth below in this
Section 8.6.

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                  (b)      Within thirty (30) days after the end of each Quarter
during the Co-Promotion Term, each Party shall provide the other Party with a
statement of the expenses described in Sections 8.2, 8.3 and 8.4 relating to the
Co-Promotion of Products, if any, incurred by such Party during such Quarter, as
well as the details of any adjustments to be made to the amounts submitted by
such Party for previous Quarters (such reports, "Quarterly Expense Reports").
The Quarterly Expense Reports shall be in a form to be mutually agreed by the
Parties within ninety (90) days after the Execution Date.

                  (c)      Within forty (40) days after the end of each Quarter
during the Co-Promotion Term, Eyetech shall prepare and deliver to Pfizer a
report setting forth (i) the Net Sales of the Products in the US Territory
during said Quarter, (ii) adjustments (including reimbursements or recoupment of
prior deductions), if any, to Net Sales reported for any previous Quarter, (iii)
each Party's share of the amounts set forth in the Quarterly Expense Reports for
such Quarter, (iv) a calculation of the net amount payable and the Party owing
such net amount after subtracting each Party's share of the amounts set forth in
the Quarterly Expense Reports from each Party's share of Net Sales for such
Quarter and (v) a statement of the net amount payable and the Party owing such
net amount based on the foregoing calculation. The report prepared and delivered
by Eyetech pursuant to this Section 8.6(c) shall be in a form to be mutually
agreed by the Parties within ninety (90) days after the Execution Date.
Notwithstanding the foregoing provisions of Section 8.6(b) and this Section
8.6(c), the first Quarter for which the Parties shall provide Quarterly Expense
Reports and for which Eyetech shall provide a report pursuant to this Section
8.6(c) shall be the second Quarter of 2003, and adjustments shall be included in
the Parties' first Quarterly Expense Reports for any Regulatory Costs, Cost of
Goods Sold and Marketing Expenses incurred by the Parties between the

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<PAGE>

Execution Date and the end of the first Quarter of 2003 as if such costs and
expenses were adjustments to be made to amounts previously reported in Quarterly
Expense Reports.

                  (d)      The net amount payable, if any, as set forth in the
report prepared and delivered in accordance with Section 8.6(c) shall be paid by
the Party owing such net amount to the other Party within fifteen (15) days
after such report is delivered by Eyetech.

         8.7      Offset. Any amount payable by either Party pursuant to Section
8.6 may be offset against any other amounts then payable to such Party under
Section 8.1.

                                   ARTICLE 9

                             ACCOUNTING AND REPORTS

         9.1      Books and Records. Each Party shall keep comprehensive books
and records relating to this Agreement in accordance with GAAP. Such books and
records shall document all Detailing Reports and Net Sales, authorized expenses
incurred or paid and any other costs incurred (including Marketing Expenses,
Manufacturing Costs, third party royalty expenses, product liability and product
recall expenses and Development Costs) or revenues earned relating to this
Agreement and include all information subject to audit pursuant to Section 9.2.
All such books and records shall be maintained for three (3) Years following the
relevant Year or such longer period as is required by Law.

         9.2      Audits. These audit and adjustment provisions apply with
respect to all payments due from one Party to another pursuant to this
Agreement, including without limitation amounts payable pursuant to Article 8
and the number of Details performed under Section 6.4. Each Party shall have the
right to have the applicable books and records of the other Party audited by a
nationally recognized independent certified public accountant, selected by a
Party (as to which firm the other Party has no reasonable objection), under
appropriate confidentiality provisions

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<PAGE>

reasonably acceptable to the accounting firm conducting the audit, for the sole
purpose of verifying the accuracy of all financial, accounting and numerical
information and calculations under this Agreement. Any such audit shall be
conducted no more than once each Year during the Co-Promotion Term, shall be
limited to payments due within the prior three (3) Years, and shall be conducted
upon at least thirty (30) days' advance notice during normal business hours and
in a manner that does not interfere unreasonably with the business of the
audited entity. The results of any such audit shall be delivered in writing to
each party. Any underpayment or overbilling determined by such audit shall
promptly be paid or refunded by the audited Party. If the audited Party has
underpaid or overbilled amounts due under this Agreement by more than five
percent (5%) over any reporting period, the audited Party shall also reimburse
the other Party for the cost of such audit (with the cost of the audit to be
paid by the auditing Party in all other cases), plus interest at the interest
rate set forth in Section 7.2, from the date of any such underpayment or
overpayment. If the audited party is shown to be a Shortfall Party, the
provisions of Section 6.5 of this Agreement shall control. Such accountants
shall not reveal to the party seeking verification the details of its review,
except insofar as is necessary to describe the underpayment, overbilling or
level of Details. Any dispute arising out of any audit conducted pursuant to
this Section 9.2 and any other dispute arising out of the Parties' respective
payment obligations under this Agreement shall be resolved through binding
arbitration in accordance with Article 15, and either party may submit such
dispute to such binding arbitration.

         9.3      Sales Force Efforts. For two (2) Years following each Year,
each Party shall keep records relating to Details made by its Sales
Representatives, and Detailing Reports, during or for such Year, including
sampling of the Products. Such records shall be available for inspection and
audit in accordance with Section 9.2 above to determine compliance with the
terms hereof.

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                                   ARTICLE 10

                    INTELLECTUAL PROPERTY RIGHTS AND LABELING

         10.1     Trademark and Corporate Logos.

                  (a)      Subject to the provisions of this Section 10.1, each
Party shall retain all right, title and interest in and to its respective
corporate name and logo.

                  (b)      In the Territory, the Products shall be promoted and
sold solely under the MACUGEN Trademark and shall use a trade dress mutually
agreed by the Parties that includes Pfizer's and Eyetech's logos; provided that,
on a country-by-country basis in the ROW Territory, the Parties may jointly
agree that Pfizer shall promote and sell the Products in the ROW Territory under
Trademarks other than the MACUGEN Trademark in accordance with Section 10.1(e).
In the Territory, subject to the requirements of Law, Eyetech and Pfizer shall
be identified and given equal exposure and prominence on all Product package
inserts, trade packages, packaging, samples, and promotional materials; provided
that Eyetech acknowledges that in the ROW Territory such identification of
Eyetech shall be as the licensor or developer of the Products; and provided,
further, that if Eyetech or Pfizer cannot be given equal exposure and prominence
on all Product package inserts, trade packages, packaging, samples, and
promotional materials in the Territory as a result of the requirements of Law,
then Eyetech or Pfizer, as the case may be, shall be given as close to equal
exposure and prominence as possible, consistent with applicable Law.

                  (c)      For the Co-Promotion Term, (i) Pfizer grants to
Eyetech the non-exclusive right, free of charge, to use the Pfizer name and logo
in the US Territory solely for the purpose of Co-Promotion of the Products in
accordance with the terms of this Agreement and (ii) Eyetech grants to Pfizer
the non-exclusive right, free of charge, to use the Eyetech name and logo and
the

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<PAGE>

Trademark(s) in the US Territory solely for the purpose of Co-Promotion of the
Products in accordance with the terms of this Agreement; provided that such
rights shall be exercised, and all Products bearing such names and/or logos
and/or such Trademark shall be manufactured, in accordance with the quality
standards established by the MSC.

                  (d)      For the Term (as defined in the License Agreement),
Eyetech grants to Pfizer the non-exclusive right, free of charge, to use the
Eyetech name and logo and the Trademark(s) in the ROW Territory solely for
purposes of marketing and promoting Products in the ROW Territory in accordance
with the License Agreement; provided that such right shall be exercised, and all
Products bearing such names and/or logos and/or such Trademark(s) shall be
manufactured, in accordance with the quality standards established by the MSC.

                  (e)      Eyetech shall remain the owner of the Eyetech name
and logo and the Trademark(s) and the goodwill pertaining thereto. Eyetech shall
be solely responsible for registering and maintaining the Trademark(s) in the
Territory and shall remain the owner thereof. Except as contemplated herein,
Eyetech shall have no rights in or to the Pfizer name or logo or the goodwill
pertaining thereto. Except as contemplated herein, Pfizer shall have no rights
in the Trademark(s) in the Territory or to the Eyetech name or logo, or the
goodwill pertaining thereto. It is the Parties' intention to utilize a single
trademark for the Product throughout the Territory. Accordingly, Pfizer agrees
to use the MACUGEN Trademark for the Products in the ROW Territory, provided,
however, if any Governmental Authority in the EMEA or Japan fails to approve
MACUGEN as the trademark for the Product, or if either Party reasonably
determines that use of the MACUGEN Trademark may violate the rights of any third
party in the ROW Territory, then the Parties shall jointly select an alternative
Trademark for the Product in the ROW Territory. In either event, Eyetech shall
be solely responsible for registering and

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<PAGE>

maintaining such alternative Trademark in the ROW Territory and shall be the
owner thereof. Pfizer shall not register or seek to register the MACUGEN
Trademark or any alternative Trademark selected by the Parties in any country of
the Territory. [**] responsible for [**] of the cost of registering and
maintaining the Trademark(s) in the US Territory and [**] shall be responsible
for [**] percent ([**]%) of the cost of registering and maintaining the
Trademark(s) in the ROW Territory. Eyetech shall include all such US Territory
costs in Eyetech's Quarterly Expense Reports pursuant to Section 8.6(b). Pfizer
shall reimburse Eyetech for all such ROW Territory costs incurred by Eyetech
within thirty (30) days after receiving any invoice from Eyetech for such costs.

                  (f)      Eyetech shall inform Pfizer promptly of any
infringement of or challenge to the Trademark(s) in the Territory, whether
actual or threatened, which comes to the notice of Eyetech. In respect of the
defense and infringement of the Trademark(s) in the ROW Territory, as between
Pfizer and Eyetech, Pfizer shall have the first right, at its sole cost and
expense, to bring suit and to take action against such infringer or challenger,
in which case Pfizer shall control the prosecution or defense of any such suit
or claim, including without limitation, the choice of counsel, and shall have
the exclusive right to settle or dispose of any such suit or claim. Eyetech
shall provide reasonable assistance and co-operation as Pfizer may reasonably
request, at Pfizer's sole cost and expense.

                  (g)      Pfizer shall inform Eyetech promptly of any
infringement of or challenge to the Trademark(s) in the Territory, in each case
whether actual or threatened, which comes to the notice of Pfizer. In respect of
the defense and infringement of the Trademark(s) in the US Territory, as between
Eyetech and Pfizer, Eyetech shall have the first right to bring suit and to take
action against such infringer or challenger, in which case Eyetech shall control
the

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<PAGE>

prosecution or defense of any such suit or claim, including without limitation,
the choice of counsel, and shall have the exclusive right to settle or dispose
of any such suit or claim. Pfizer shall provide reasonable assistance and
co-operation as Eyetech may reasonably request.

                  (h)      Notwithstanding anything to the contrary in Sections
10.1(f) and 10.1(g) above, if a Party fails to initiate a suit or take other
appropriate action that it has the initial right to initiate or take pursuant to
Section 10.1(f) or Section 10.1(g), as applicable, within ninety (90) days after
becoming aware of the basis for such suit or action, then the other Party may,
in its discretion, provide the Party having the initial right with written
notice of such other Party's intent to initiate a suit or take other appropriate
action. If such other Party provides such notice and the Party having the
initial right fails to initiate a suit or take such appropriate action within
thirty (30) days after receipt of such notice from the other Party, then the
other Party shall have the right to initiate a suit or take other appropriate
action that it believes is reasonably required to protect the intellectual
property rights at issue. The proceeds of any recovery, court award or
settlement of such action shall first be applied to reimburse the Parties for
the costs and expenses of such prosecution and the balance shall be paid, for
amounts relating to the US Territory, [**] percent ([**]%) to Pfizer and [**]
percent ([**]%) to Eyetech, and for amounts relating to the ROW Territory, [**]
percent ([**]%) to Pfizer and [**] percent ([**]%) to Eyetech.

         10.2     Copyrights and Proprietary Programs. Eyetech shall own all
copyrights relating to Promotional Materials developed for use in the US
Territory for the Products. Pfizer and Eyetech shall each retain all rights
including, without limitation, copyrights and trademarks, to all of their
respective existing programs and materials in all formats (print, video, audio,
digital, computer, etc.) regarding sales training, patient education and disease
management programs owned by each of them as of the Execution Date, as well as
any modifications each may develop

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in the future which are not specific to the Product. Eyetech and Pfizer shall,
from time to time, endeavor to each notify the other as to the identity of such
existing programs and materials. In addition, all new programs regarding sales
training, patient education and disease management jointly developed by Eyetech
and Pfizer pursuant to this Agreement shall be jointly owned by Eyetech and
Pfizer, and each Party shall have the right to use and exploit such developed
programs freely without any need to obtain the consent of the other Party and
without any duty to account to the other Party for such use or exploitation.
Each Party hereby assigns to the other Party all rights, title and interests,
including all intellectual property rights, in and to such Promotional Materials
and programs as necessary to give effect to the provisions of this Section 10.2.

         10.3     Developments. All ideas, inventions, Know-How, writings, data
and technical information (whether patentable or copyrightable or not) arising
out of any development or Product Study of any AMD Product or DME Product,
whether such development or study is sponsored and/or conducted by Eyetech or
Pfizer or their respective Affiliates or any third party shall be owned by
Eyetech. Pfizer hereby assigns to Eyetech all rights, title and interests,
including all intellectual property rights, in and to such ideas, inventions,
Know-How, writings, data and technical information as necessary to give effect
to the provisions of this Section 10.3.

         10.4     Third Party Agreements. Subject to Pfizer's performance of its
material obligations under this Agreement and under the License Agreement with
respect to its exercise of rights sublicensed to Pfizer by Eyetech and with
respect to third party royalties payable by Pfizer, Eyetech covenants and agrees
with Pfizer that, except where a failure by Eyetech to comply with the following
would not have a material adverse effect on the Co-Promotion of the Products,
Eyetech: (a) shall not execute any amendment, modification or waiver of any of
the

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licenses and agreements listed on Exhibit 10.4 ("Third Party Agreements")
without the prior written consent of Pfizer, (b) shall not make any election or
exercise any right or option (or omit to take any action) that would terminate
or relinquish in whole or in part any Third Party Agreement, (c) shall comply
with all of its obligations under the Third Party Agreements in all material
respects, (d) shall take such reasonable actions as shall be necessary to keep
in full force and effect the Third Party Agreements, and (e) shall give prompt
notice to Pfizer, together with a summary of outstanding issues if Pfizer so
requests and subject to any obligations of confidentiality owed by Eyetech to
the other parties to such Third Party Agreements, of any actual or alleged
defaults, breaches, violations, proposed amendments or proposed modifications
of, or any proposed waivers under, any of the Third Party Agreements by any of
the parties to the Third Party Agreements.

                                   ARTICLE 11

                            CONFIDENTIAL INFORMATION

         11.1     Treatment of Confidential Information. During the Co-Promotion
Term and for five (5) years after the expiration or termination of this
Agreement, each Party shall maintain Confidential Information (as defined in
Section 11.2) of the other Party in confidence, and shall not disclose, divulge
or otherwise communicate such Confidential Information to others (except for
agents and advisors under obligations of confidentiality) or use it for any
purpose other than in connection with the development, manufacture, marketing,
promotion, distribution or sale of the Products as provided in this Agreement,
and each Party agrees to exercise reasonable efforts to prevent and restrain the
unauthorized disclosure of such Confidential Information by any of its
directors, officers, employees, consultants, subcontractors, licensees or
agents, which reasonable

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efforts shall be at least as diligent as those generally used by such Party in
protecting its own confidential and proprietary information.

         11.2     Confidential Information. "Confidential Information" means all
trade secrets or other proprietary information, including without limitation any
proprietary data and materials (whether or not patentable or protectable as a
trade secret), regarding a Party's technology, products, business or objectives
or regarding the Products, which is disclosed by a Party to the other Party. All
information disclosed prior to the Effective Date by Eyetech to Pfizer under or
pursuant to the confidentiality agreement between the Parties dated as of April
22, 2002, as amended, shall be deemed "Confidential Information" of Eyetech.
Notwithstanding the foregoing, there shall be excluded from the foregoing
definition of Confidential Information any of the foregoing that:

                  (a)      was known by the receiving Party prior to its date of
disclosure to the receiving Party as shown by the receiving Party's written
records; or

                  (b)      either before or after the date of the disclosure to
the receiving Party is lawfully disclosed to the receiving Party by third
parties not in violation of any obligation to the other Party; or

                  (c)      either before or after the date of the disclosure to
the receiving Party becomes published or generally known to the public through
no fault or omission on the part of the receiving Party or its Affiliates; or

                  (d)      is independently developed by or for the receiving
Party without reference to or reliance upon the Confidential Information as
demonstrated by contemporaneous written records of the receiving Party; or

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<PAGE>

                  (e)      is required to be disclosed by the receiving Party to
comply with applicable Laws, to defend or prosecute litigation or to comply with
governmental regulations or the regulations or requirements of any stock
exchange or Nasdaq, provided that the receiving Party provides prior notice of
such disclosure to the other Party and takes reasonable and lawful actions to
avoid and/or minimize the degree of such disclosure.

                                   ARTICLE 12

                 REPRESENTATIONS, WARRANTIES AND INDEMNIFICATION

         12.1     Eyetech's Representations. Eyetech hereby represents and
warrants as of the date hereof as follows:

                  (a)      Eyetech has the corporate power and authority to
execute and deliver this Agreement and to perform its obligations hereunder, and
the execution, delivery and performance of this Agreement has been duly and
validly authorized and approved by proper corporate action on the part of
Eyetech, and Eyetech has taken all other action required by law, its certificate
of incorporation or by-laws or any agreement to which it is a party or by which
it or its assets are bound required to authorize such execution, delivery and
(subject to obtaining all necessary governmental approvals with respect to the
manufacture, use, sale, offer for sale, or importation of Products and subject
to any necessary HSR Clearance) performance. Assuming due authorization,
execution and delivery on the part of Pfizer, this Agreement constitutes a
legal, valid and binding obligation of Eyetech, enforceable against Eyetech in
accordance with its terms.

                  (b)      All manufacturing operations conducted by Eyetech (or
by third parties on its behalf) relating to the manufacturing of the Products
are being conducted in material

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compliance with applicable requirements and standards of any Governmental
Authority in the jurisdiction(s) in which such manufacturing is being conducted.

                  (c)      The representations and warranties of Eyetech
contained in the License Agreement are true and correct in all respects.

                  (d)      Eyetech has disclosed to Pfizer all material
information known to Eyetech relating to: (i) the drug quality, including
stability, variability, impurities and delivery performance in each case
relating to the Product, and (ii) changes made by Eyetech or its Affiliates
after the initiation of Phase III Clinical Trials for the Products relating to
formulation, packaging and method of manufacture and formulation and to
processing parameters, and (iii) the status of discussions with FDA or any
Governmental Authorities directly relating thereto, and (iv) clinical trial site
and contract research organization compliance with all provisions of the Act
governing clinical investigations, and (v) the safety and efficacy of the
Products.

         12.2     Pfizer's Representations. Pfizer hereby represents and
warrants as of the date hereof as follows:

                  (a)      Pfizer has the corporate power and authority to
execute and deliver this Agreement and to perform its obligations hereunder, and
the execution, delivery and performance of this Agreement has been duly and
validly authorized and approved by proper corporate action on the part of
Pfizer, and Pfizer has taken all other action required by law, its certificate
of incorporation or by-laws or any agreement to which it is a party or by which
it or its assets are bound required to authorize such execution, delivery and
(subject to obtaining all necessary governmental approvals with respect to the
manufacture, use, sale, offer for sale, or importation of Products and subject
to any necessary HSR Clearance) performance. Assuming due authorization,
execution and delivery on the part of Eyetech, this Agreement constitutes a

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legal, valid and binding obligation of Pfizer, enforceable against Pfizer in
accordance with its terms.

                  (b)      The representations and warranties of Pfizer
contained in the License Agreement are true and correct in all respects.

         12.3     No Warranties. EXCEPT AS OTHERWISE EXPRESSLY SET FORTH HEREIN,
THE PARTIES MAKE NO REPRESENTATIONS AND EXTEND NO WARRANTIES OF ANY KIND, EITHER
EXPRESS OR IMPLIED.

         12.4     General Indemnification in Favor of Pfizer.

                  (a)      Eyetech shall indemnify, defend and hold Pfizer
Parties (as hereinafter defined) harmless from and against any and all Losses
(as hereinafter defined) incurred, suffered or sustained by Pfizer Parties or to
which Pfizer Parties become subject, arising out of or resulting from:

                           (i)      any misrepresentation or breach of any
representation, warranty, covenant or agreement made by Eyetech in this
Agreement or the Other Product-Related Agreements; or

                           (ii)     any violation of the Act by Eyetech; or

                           (iii)    any third party claims, actions, suits,
proceedings, liabilities or obligations ("Third Party Claims") arising out of or
resulting from:

                                    (aa)     any misrepresentation or breach of
                  any representation, warranty, covenant or agreement made by
                  Eyetech in this Agreement or the Other Product-Related
                  Agreements; or

                                    (bb)     the manufacture, use or sale of a
                  Product, including without limitation all Third Party Claims
                  involving death or bodily injury caused or

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                  allegedly caused by the use of the Product (any all such
                  Losses, "Product Liability"), where Eyetech is the
                  manufacturer of Product (but not where Eyetech is the
                  contracting Party with API Bulk Drug Substance Supplier(s)
                  and/or Fill and Finish Services Supplier(s) pursuant to
                  Section 6.12) and where such Product fails to meet
                  Specifications or is not manufactured in accordance with GMP,
                  if applicable; or

                                    (cc)     the gross negligence, recklessness
                  or willful misconduct (other than as to Product Liability
                  matters) of Eyetech Parties in connection with Eyetech's
                  performance of this Agreement or the Other Product-Related
                  Agreements.

For purposes of this Article 12, "Pfizer Parties" means Pfizer and its
Affiliates and their respective agents, directors, officers and employees.

                  (b)      None of the indemnities in Section 12.4(a) shall
apply to the extent that any Loss is the result of any breach of this Agreement
or the Other Product-Related Agreements by Pfizer or of any gross negligence,
recklessness or willful misconduct of Pfizer Parties.

         12.5     General Indemnification in Favor of Eyetech.

                  (a)      Pfizer shall indemnify, defend and hold Eyetech
Parties (as hereinafter defined) harmless from and against any and all Losses
incurred, suffered or sustained by Eyetech Parties or to which Eyetech Parties
become subject, arising out of or resulting from:

                           (i)      any misrepresentation or breach of any
representation, warranty, covenant or agreement made by Pfizer in this Agreement
or the Other Product-Related Agreements; or

                           (ii)     any violation of the Act by Pfizer; or

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                           (iii)    any Third Party Claims arising out of or
                  resulting from:

                                    (aa)     any misrepresentation or breach of
                  any representation, warranty, covenant or agreement made by
                  Pfizer in this Agreement or the Other Product-Related
                  Agreements; or

                                    (bb)     Product Liability, where Pfizer is
                  the manufacturer of Product (but not where Pfizer is the
                  contracting Party with API Bulk Drug Substance Supplier(s)
                  and/or Fill and Finish Services Supplier(s) pursuant to
                  Section 6.12) and where such Product fails to meet
                  Specifications or is not manufactured in accordance with GMP,
                  if applicable; or

                                    (cc)     the gross negligence, recklessness
                  or willful misconduct (other than as to Product Liability
                  matters) of Pfizer Parties in connection with Pfizer's
                  performance of this Agreement or the Other Product-Related
                  Agreements.

For purposes of this Article 12, "Eyetech Parties" means Eyetech and its
Affiliates and their respective agents, directors, officers and employees.

                  (b)      None of the indemnities in Section 12.5(a) shall
apply to the extent that any Loss is the result of any breach of this Agreement
or the Other Product-Related Agreements by Eyetech or of any gross negligence,
recklessness or willful misconduct of Eyetech Parties.

         12.6     Product Liability and Intellectual Property Infringement
Indemnification.

                  (a)      Product Liability.

                           (i)      US Territory. Eyetech shall indemnify,
defend and hold the Pfizer Parties harmless from and against [**] percent
([**]%) of the amount of any and all Losses arising out of or resulting from any
Third Party Claim involving Product Liability in the US

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Territory (other than Product Liability Losses for which one Party is obligated
to indemnify the other Party pursuant to Section 12.4 or 12.5); Pfizer shall
indemnify, defend and hold the Eyetech Parties harmless from and against [**]
percent ([**]%) of the amount of any and all Losses arising out of or resulting
from any Third Party Claim involving Product Liability in the US Territory
(other than Product Liability Losses for which one Party is obligated to
indemnify the other Party pursuant to Section 12.4 or 12.5).

                           (ii)     ROW Territory. Pfizer shall indemnify,
defend and hold Eyetech Parties harmless from and against [**] percent ([**]%)
of the amount of any and all Losses arising out of or resulting from any Third
Party Claim involving Product Liability in the ROW Territory (other than Product
Liability Losses for which Eyetech is obligated to indemnify Pfizer pursuant to
Section 12.4).

                           (iii)    Certain Product Liability Claims.
Notwithstanding Sections 12.6(a)(i) and 12.6(a)(ii) above, Eyetech shall
indemnify, defend and hold the Pfizer Parties harmless from and against [**]
percent ([**]%) of the amount of any and all Losses arising out of or resulting
from any Third Party Claims involving the Product Liability matters described in
Exhibit 12.6(a)(iii).

                  (b)      Intellectual Property Infringement.

                           (i)      US Territory. Eyetech shall indemnify,
defend and hold the Pfizer Parties harmless from and against [**] percent
([**]%) of the amount of any and all Losses arising out of or resulting from any
Third Party Claims involving any actual or alleged infringement of any
trademarks, patent rights or other intellectual property rights, or
misappropriation of trade secrets, of any Person in connection with the
manufacture, use, sale or importation of the Product in the US Territory or in
connection with the manufacture or use of

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the Product in the ROW Territory for subsequent importation and/or sale in the
US Territory (other than Losses for which one Party is obligated to indemnify
the other Party pursuant to Section 12.4 or 12.5 and other than Losses relating
to Products ultimately sold outside the US Territory, which are governed by
Section 12.6(b)(ii)); Pfizer shall indemnify, defend and hold the Eyetech
Parties harmless from and against [**] percent ([**]%) of the amount of any and
all Losses arising out of or resulting from any Third Party Claims involving any
actual or alleged infringement of any trademarks, patent rights or other
intellectual property rights, or misappropriation of trade secrets, of any
Person in connection with the manufacture, use, sale or importation of the
Product in the US Territory or in connection with the manufacture or use of the
Product in the ROW Territory for subsequent importation and/or sale in the US
Territory (other than Losses for which one Party is obligated to indemnify the
other Party pursuant to Section 12.4 or 12.5 and other than Losses relating to
Products ultimately sold outside the US Territory, which are governed by Section
12.6(b)(ii)).

                           (ii)     ROW Territory. Pfizer shall indemnify,
defend and hold the Eyetech Parties harmless from and against [**] percent
([**]%) of the amount of any and all Losses arising out of or resulting from any
Third Party Claims involving any actual or alleged infringement of any
trademarks, patent rights or other intellectual property rights, or
misappropriation of trade secrets, of any Person in connection with the
manufacture, use, sale or importation of the Product in the ROW Territory or in
connection with the manufacture or use of the Product in the US Territory for
subsequent importation and/or sale in the ROW Territory (other than Losses for
which Eyetech is obligated to indemnify Pfizer pursuant to Section 12.4 and
other than Losses relating to Products ultimately sold by Eyetech in the US
Territory, which are governed by Section 12.6(b)(i)).

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                           (iii)    Certain Third Party Intellectual Property.
Notwithstanding Sections 12.6(b)(i) and 12.6(b)(ii) above, Eyetech shall
indemnify, defend and hold the Pfizer Parties harmless from and against [**]
percent ([**]%) of the amount of any and all Losses arising out of or resulting
from any Third Party Claims based on the matters set forth in:

                           (A)      the letter from Harsha Murthy to Larry
                                    Miller dated December 17, 2002 in connection
                                    with the manufacture, use, sale or
                                    importation of Products in the Territory;
                                    provided that such indemnity shall not apply
                                    to (I) Losses for which Pfizer is obligated
                                    to indemnify Eyetech pursuant to Section
                                    12.5, (II) Losses arising out of Third Party
                                    Claims [**] such Losses or (III) royalties
                                    or other amounts payable [**]; or

                           (B)      Exhibit 12.6(b)(iii)(B).

         12.7     "Losses". For purposes of this Article 12, "Losses" shall
mean, subject to Section 12.8, any and all (a) claims, losses, liabilities,
damages, fines, royalties, governmental penalties or punitive damages,
deficiencies, interest, awards, and judgments, and (b) with respect to third
parties, settlement amounts and all of the items referred to in clause (a) above
which, in accordance with Section 12.8, include third party special, indirect,
incidental, consequential damages (including without limitation lost profits)
and third party punitive and multiple damages, and (c) in connection with all of
the items referred in clauses (a) and (b) above, any and all costs and expenses
(including reasonable attorneys' fees and all other expenses reasonably incurred
in investigating, preparing or defending any litigation or proceeding, commenced
or threatened).

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         12.8     No Consequential or Punitive Damages.

                  (a)      NEITHER PARTY HERETO WILL BE LIABLE FOR INDIRECT,
INCIDENTAL, CONSEQUENTIAL, SPECIAL, EXEMPLARY OR PUNITIVE DAMAGES ARISING FROM
OR RELATING TO ANY BREACH OF THIS AGREEMENT, OR FOR LOST PROFITS ARISING FROM OR
RELATING TO ANY BREACH OF THIS AGREEMENT, REGARDLESS OF ANY NOTICE OF SUCH
DAMAGES. NOTHING IN THIS SECTION 12.8 IS INTENDED TO LIMIT OR RESTRICT THE
INDEMNIFICATION RIGHTS OR OBLIGATIONS OF EITHER PARTY UNDER THIS AGREEMENT WITH
RESPECT TO THIRD PARTY CLAIMS.

                  (b)      Notwithstanding anything to the contrary contained in
this Agreement, in the case of any claim by any Party alleging any breach of
this Agreement by the other Party, any payment obligation pursuant to Sections
8.1 and 8.6 of this Agreement (the "Payment Obligations"), will not be
considered as constituting special, incidental, indirect or consequential
damages under this Agreement (and, accordingly, nothing in Section 12.8(a) shall
prevent the recovery or inclusion of Payment Obligations in the definition of
"Losses").

         12.9     General Indemnification Procedures.

                  (a)      A Party seeking indemnification pursuant to this
Article 12 (an "Indemnified Party") shall give prompt notice to the Party from
whom such indemnification is sought (the "Indemnifying Party") of the
commencement or assertion of any Third Party Claim (which in no event includes
any claims by any Pfizer Parties or any Eyetech Parties) in respect of which
indemnity may be sought hereunder, shall give the Indemnifying Party such
information with respect thereto as the Indemnifying Party may reasonably
request, and shall not make any admission concerning such Third Party Claim,
unless such admission is required by applicable

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Law or legal process, including in response to questions presented in
depositions or interrogatories. Any admission made by the Indemnified Party,
except for an admission required by applicable Law or legal process, or the
failure to give such notice shall relieve the Indemnifying Party of any
liability hereunder only to the extent that the ability of the Indemnifying
Party to defend such Third Party Claim is prejudiced thereby. The Indemnifying
Party shall have the right, exercisable by written notice to the Indemnified
Party within thirty (30) days of receipt of notice from the Indemnified Party of
the commencement or assertion of a Third Party Claim, to assume and conduct the
defense of such Third Party Claim, with counsel selected by the Indemnifying
Party and reasonably acceptable to the Indemnified Party. The Indemnified Party
shall not settle such Third Party Claim within such thirty (30) day period.
Subject to the initial and continuing satisfaction of the terms and conditions
of this Article 12, the Indemnifying Party shall have full control of such Third
Party Claim, including settlement negotiations and any legal proceedings. If the
Indemnifying Party does not assume the defense of such Third Party Claim in
accordance with this Section 12.9, the Indemnified Party may defend the Third
Party Claim. If both Parties are Indemnifying Parties pursuant to
co-indemnification obligations under Section 12.6 with respect to the same Third
Party Claim, the Parties shall determine by mutual agreement, within twenty (20)
days following their receipt of notice of commencement or assertion of such
Third Party Claim (or such lesser period of time as may be required to properly
respond to such claim), which Party shall assume the lead role in the defense
thereof. Should the Parties be unable to mutually agree on which Party shall
assume the lead role in the defense of such Third Party Claim, both Parties
shall be entitled to participate in such defense through counsel of their
respective choosing; provided that in the case of any Third Party Claim with
respect to which (i) both Parties are Indemnifying Parties pursuant to
co-

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indemnification obligations under Section 12.6(b) and (ii) more than [**]
percent ([**]%) of the Products involved in the infringement or misappropriation
alleged in such Third Party Claim were sold or intended for sale in the ROW
Territory, Pfizer may defend the Third Party Claim in accordance with this
Section 12.9 (without giving effect to the immediately preceding sentence), but
may not enter into any settlement or consent to any judgment with respect to
such Third Party Claim without Eyetech's prior written consent if either (x)
such settlement or judgment would, taking into account the indemnification
provisions of Section 12.6(b), impose more than $[**] in liability on Eyetech or
(y) such settlement or judgment would, taking into account the indemnification
provisions of Section 12.6(b), impose more monetary liability on Eyetech than on
Pfizer or include non-monetary conditions with respect to Eyetech.

                  (b)      The Indemnifying Party or the Indemnified Party, as
the case may be, shall have the right to participate in (but not control), at
its own expense (subject to the immediately succeeding sentence), the defense of
any Third Party Claim which the other is defending as provided in this
Agreement. The Indemnifying Party shall not be liable for any litigation costs
or expenses incurred, without its consent, by the Indemnified Party where the
action or proceeding is under the control of the Indemnifying Party; provided,
however, that if the Indemnifying Party fails to take reasonable steps necessary
to defend such Third Party Claim, the Indemnified Party may assume its own
defense, and the Indemnifying Party will be liable for all reasonable costs or
expenses paid or incurred in connection therewith.

                  (c)      The Indemnifying Party, if it shall have assumed the
defense of any Third Party Claim as provided in this Agreement, shall not
consent to a settlement of, or the entry of any judgment arising from, any such
Third Party Claim to the extent such Third Party Claim involves equitable or
other non-monetary relief from the Indemnified Party. No Party shall,

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<PAGE>

without the prior written consent of the other Party, enter into any compromise
or settlement which commits the other Party to take, or to forbear to take, any
action.

                  (d)      Whether the Indemnifying Party chooses to defend or
prosecute any Third Party Claim, all the Parties hereto shall cooperate in the
defense or prosecution thereof and shall furnish such records, information and
testimony, and attend such conferences, discovery proceedings, hearings, trials
and appeals, as may be reasonably requested in connection therewith.

                  (e)      The Indemnified Party shall use commercially
reasonable efforts to pursue all rights and remedies available in order to
minimize the Losses for which indemnification is provided to the Indemnified
Party under this Article 12. Any indemnification hereunder shall be made net of
any insurance proceeds recovered by the Indemnified Party from unaffiliated
third parties; provided, however, that if, following the payment to the
Indemnified Party of any amount under this Article 12, such Indemnified Party
recovers any such insurance proceeds in respect of the claim for which such
indemnification payment was made, the Indemnified Party shall promptly pay an
amount equal to the amount of such proceeds (but not exceeding the amount of
such indemnification payment) to the Indemnifying Party.

                  (f)      The Parties agree and acknowledge that the provisions
of this Article 12 represent the Indemnified Party's exclusive recourse with
respect to any Losses for which indemnification is provided to the Indemnified
Party under this Article 12.

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                                   ARTICLE 13

                              TERM AND TERMINATION

         13.1     Term. This Agreement shall be effective as of the Effective
Date and shall continue in force until the expiration of the Co-Promotion Term,
unless sooner terminated as provided herein.

         13.2     Termination for Breach. Eyetech shall have the rights set
forth below in this Section 13.2 by notice to Pfizer, and Pfizer shall have the
rights set forth below in this Section 13.2 by notice to Eyetech.

                  (a)      Upon Eyetech's notice to Pfizer that a Material
Default by Pfizer has occurred, the Parties will meet to discuss in good faith
whether a plan to remedy the Material Default can be mutually agreed. If the
Parties fail to so agree within thirty (30) days after the date of such notice,
Section 13.2(b) below shall apply. Notwithstanding the foregoing provisions of
this Section 13.2(a), in the case of a payment default, the provisions of
Section 13.2(b) below shall apply without any obligation to meet to discuss
remedies pursuant to this Section 13.2(a).

                  (b)      Subject to the terms hereof, upon the occurrence of
any Material Default by Pfizer, Eyetech may, upon ninety (90) days prior written
notice, terminate this Agreement and the other Product-Related Agreements.
Eyetech may give the notice specified in this Section 13.2(b) concurrently with
the notice specified in Section 13.2(a) and shall not give the notice specified
in this Section 13.2(b) later than sixty (60) days after the date of the notice
specified in Section 13.2(a).

                  (c)      Upon Pfizer's notice to Eyetech that a Material
Default by Eyetech has occurred, the Parties will meet to discuss in good faith
whether a plan to remedy the Material Default can be mutually agreed. If the
Parties fail to so agree within thirty (30) days after the

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<PAGE>

date of such notice, Section 13.2 (d) below shall apply. Notwithstanding the
foregoing provisions of this Section 13.2(c), in the case of a payment default,
the provisions of Section 13.2(d) below shall apply without any obligation to
meet to discuss remedies pursuant to this Section 13.2(c).

                  (d)      Subject to the terms hereof, upon the occurrence of
any Material Default by Eyetech, Pfizer may, upon ninety (90) days prior notice,
terminate this Agreement and the other Product-Related Agreements. Pfizer may
give the notice specified in this Section 13.2(d) concurrently with the notice
specified in Section 13.2(c) and shall not give the notice specified in this
Section 13.2(d) later than sixty (60) days after the date of the notice
specified in Section 13.2(c).

                  (e)      "Material Default" means:

                           (i)      any default by any Party hereto of its
covenants, agreements or other performance obligations under this Agreement or
the License Agreement other than a payment default (which may include any one or
more defaults of any specific covenant, agreement or other performance
obligations contained herein) that, when aggregated with any other such uncured
defaults by such Party, is (x) material to this Agreement and the License
Agreement taken as a whole, and (y) shall have continued for thirty (30) days
after written notice thereof was provided to the alleged defaulting Party by the
non-defaulting Party (or, if such defaults cannot be cured within such 30-day
period, if the alleged defaulting Party does not promptly commence and
diligently continue all reasonable actions to cure such defaults during such
30-day period or does not cure in full such defaults within sixty (60) days
after written notice thereof was provided to the alleged defaulting Party); or

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                           (ii)     any default by any Party hereto of its
payment obligations hereunder that shall have continued for fifteen (15) days
after written notice thereof was provided to the alleged defaulting Party by the
non-defaulting Party; provided that, in the event of a good faith payment
dispute, such fifteen (15) day cure period shall be extended through the
fifteenth day following the date on which such dispute is resolved if the
alleged defaulting Party paid all undisputed amounts when due and provided the
non-defaulting Party with a reasonably detailed written explanation of the
alleged defaulting Party's basis for disputing the payment obligation within the
fifteen (15) day period following the written notice of the default by the
non-defaulting Party.

                  (f)      In the event of a Material Default by Eyetech
described in Section 13.2(c), Pfizer may, in its sole discretion, elect by
written notice to Eyetech of such election not later than sixty (60) days after
the date of the notice specified in Section 13.2(c), as an alternative to
terminating this Agreement and the other Product-Related Agreements, the
Elective Remedy.

         13.3     HSR Denial. Either Party may terminate all of the Transaction
Agreements effective upon notice to the other Party if the HSR Clearance Date
shall not have occurred on or prior to the date sixty (60) days after the
Parties make their respective HSR Filings pursuant to Section 16.1. In the event
of any termination pursuant to this Section 13.3, the Transaction Agreements,
including without limitation Section 13.9 of this Agreement, shall terminate;
provided, however, the confidentiality agreement between the Parties dated as of
April 22, 2002, as amended, shall remain in full force and effect
notwithstanding any termination of the Transaction Agreements in accordance with
this Section 13.3.

         13.4     Detail Shortfalls. Either Party may terminate this Agreement
as provided in Section 6.5.

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         13.5     Breach of Non-Competition obligations. If a Party breaches its
obligations under Section 14.1, the other Party may terminate this Agreement
upon thirty (30) days prior written notice of termination to the breaching
Party; provided that, if the breaching Party permanently ceases the activity or
eliminates the condition, as applicable, giving rise to the breach of its
obligations under Section 14.1 prior to the expiration of such thirty (30) day
notice period, such termination shall not take effect.

         13.6     Changes of Control. In the event of any Change in Control, the
Party subject to such Change of Control shall promptly notify the other Party of
such Change in Control, and the Party not subject to such Change of Control
shall have the right upon sixty (60) days notice, to terminate this Agreement
and the other Product-Related Agreements where the Acquiring Corporation has not
agreed to assume all obligations of an Affiliate of the Party subject to the
Change of Control under this Agreement and the License Agreement. In the event
of any Change in Control of Eyetech, Pfizer shall have the right upon one
hundred twenty (120) days notice, to terminate either or both of the Regulatory
Services Agreement and the Distribution Agreement. If the Change of Control of
Eyetech is an acquisition of Eyetech by a third party that, together with its
Affiliates, had annual revenues from the sale of prescription pharmaceutical
products in the US in excess of US$1 billion during its most recently reported
fiscal year, then the acquiring Person shall have the right upon one hundred
twenty (120) days written notice, to terminate either or both of the Regulatory
Services Agreement and the Distribution Agreement. In either event, each of
Pfizer or the acquiring Person must exercise its right of termination with six
(6) months of the date of such Change of Control.

         13.7     Termination of License Agreement. In the event that the
License Agreement is terminated or expires for any reason, either Party may, at
its option, terminate this Agreement and the other Product-Related Agreements
upon written notice of termination to the other Party.

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<PAGE>

         13.8     Sales Threshold Termination. If, during the [**] period
commencing with the Year following the earlier of (a) the implementation of a
National Coverage Determination for the first Product from the United States
Department of Health and Human Services (Centers for Medicare and Medicaid
Services) and (b) the [**] of such Product in the US Territory, the Net Sales
in the US Territory for any [**] during such [**] period are less than [**],
for the [**], and such failure to achieve such Net Sales targets is not a
result of Eyetech's material breaches of its representations, warranties,
covenants and agreements contained in this Agreement and the License Agreement
(such failure to achieve Net Sales, the "Net Sales Failure"), then Eyetech may,
at any time within [**] following determination of Net Sales for the [**], elect
to terminate this Agreement upon 180 days notice to Pfizer; provided that such
termination shall be Eyetech's sole and exclusive remedy and Pfizer's sole and
exclusive liability in the event of termination by Eyetech pursuant to this
Section 13.8. In the event of any termination of this Agreement pursuant to this
Section 13.8, Eyetech shall thereafter pay to Pfizer (x) a royalty of [**]
percent ([**]%) of the first [**] of annual Net Sales in the US Territory and
(y) a royalty of [**] percent ([**]%) of annual Net Sales in the US Territory
[**], for each Year of the [**] Years of the Co-Promotion Term immediately
following such termination, as if this Agreement had not been terminated.

         13.9     Survival of obligations. Notwithstanding any termination or
expiration of this Agreement,

                  (a)      neither Party shall be relieved of any obligations
incurred prior to such termination or expiration, including without limitation
payment obligations accrued prior to such termination or expiration;

                  (b)      the obligations of the Parties with respect to
accounts and reports (Article 9), ownership of intellectual property (Article
10), the protection and nondisclosure of Confidential Information (Article 11),
dispute resolution (Article 15), indemnification (Sections 12.4, 12.5, 12.6,
12.7, 12.8 and 12.9), this Section 13.9 and non-competition (Section 14.1), as
well as any other provision of this Agreement which by its terms survives
termination or which is required to give effect to such termination or the
consequences of such termination, shall survive termination and remain in effect
in accordance with their respective terms;

                  (c)      If the License Agreement remains in effect after such
termination or expiration of this Agreement (a "License Survival Event"), the
provisions of this Agreement that relate to Products in the RoW Territory shall
survive such termination for so long as the License Agreement remains in effect.
If a License Survival Event takes place, the Parties recognize that adjustments
may need to be made to certain of such surviving provisions relating to Products
in the RoW Territory, such as the arrangements respecting the governance
provisions set forth in Article 3. Without limiting the foregoing, the Parties
acknowledge that the following rights shall survive termination or expiration of
this Agreement in the case of a License Survival Event: (a) the rights granted
to Pfizer in Sections 10.1 and 10.2 of this Agreement; (b) Eyetech's rights with

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respect to the MSC's responsibilities for ensuring that all Products are
manufactured in accordance with the Parties' quality standards pursuant to
Section 3.5; and (c) Eyetech's rights with respect to Pfizer's regulatory
activities in the RoW Territory pursuant to Section 4.2(c) of this Agreement.
After a License Survival Event, for so long as the License Agreement remains in
effect, Pfizer shall have rights with respect to Eyetech's regulatory activities
in the US Territory commensurate with the rights Eyetech has with respect to RoW
Territory regulatory matters under Section 4.2(c);

                  (d)      Pfizer's obligations under Section 8.1 with respect
to Development Costs during the following periods immediately following
termination shall survive any termination pursuant to Section 13.2 based on
Material Default(s) by Pfizer or any termination pursuant to Section 13.7: (i)
if such termination occurs prior to the first Launch of a Product in the US
Territory, twelve (12) months, (ii) if such termination occurs after the first
Launch of a Product in the US Territory but prior to the fifth anniversary of
such Launch, nine (9) months, and (iii) if such termination occurs after the
fifth anniversary of the first Launch of a Product in the US Territory, six (6)
months;

                  (e)      Pfizer shall promptly and in no event later than
sixty (60) days after termination or expiration (i) transfer to Eyetech
ownership of all governmental or regulatory filings and approvals (including all
INDs and NDAs (and their foreign equivalents)) relating to Products, (ii)
deliver to Eyetech all pre-clinical and clinical data and information in
Pfizer's possession or control relating to Products, (iii) deliver to Eyetech
copies of all reports, records, regulatory correspondence and other materials in
Pfizer's possession or control relating to the pre-clinical and clinical
development, regulatory approval, manufacture, distribution and sales of
Products, including without limitation all information contained in the
centralized global safety

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database established and maintained by Pfizer in accordance with the Regulatory
Services Agreement, and (iv) deliver to Eyetech all data and information
relating to process conditions, in-process controls, analytical methodology and
formulation, in each case as developed by Pfizer and relating to the
manufacturing of Products, solely for use in connection with the Products;

                  (f)      Pfizer shall grant to Eyetech a non-exclusive,
non-royalty-bearing, perpetual right and license under Pfizer's and its
Affiliates' rights in Collaboration Intellectual Property (as defined in the
License Agreement) to develop, make, have made, use, sell, offer for sale,
import, and have imported Products in the Territory;

                  (g)      if Pfizer has contracted with API Bulk Drug Substance
Supplier(s) or with Fill and Finish Services Supplier(s), or if Pfizer has taken
over responsibility for performing, either directly or through Affiliates,
services that otherwise would be performed by API Bulk Drug Substance
Supplier(s) and/or Fill and Finish Services Supplier(s), Pfizer shall continue
to manufacture or have manufactured (including filling and finishing of)
Products being manufactured by Pfizer and/or its Affiliates, on the terms and
conditions in effect immediately prior to the applicable notice of termination,
for worldwide supply to Eyetech during the shorter of (i) the twenty-four (24)
month period following termination and (ii) the period following termination and
prior to Eyetech's establishment of its own manufacturing capabilities and/or
third party manufacturing and supply arrangements with respect to the Products;
and Pfizer shall cooperate with Eyetech during such period to assign to Eyetech
all third party manufacturing and supply (including fill and finish services)
agreements and transfer to Eyetech all manufacturing know-how, and to provide
Eyetech with such other assistance as may be requested by Eyetech, reasonably
required by Eyetech for the purpose of establishing its own manufacturing

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capabilities and/or third party manufacturing and supply arrangements with
respect to the Products;

                  (h)      Pfizer shall permit Eyetech, at Eyetech's option, to
purchase, at Manufacturing Cost, all or any part of Pfizer's worldwide unsold
inventory of raw materials for Products, work-in-progress Products and finished
Products as of the effective date of termination, provided that, Pfizer shall
not be required to sell to Eyetech inventories of raw materials for Products and
work-in-progress Products that Pfizer needs to satisfy its obligations under
Section 13.9(g); and

                  (i)      unless this Agreement expressly provides that
termination shall be the sole and exclusive remedy for a particular breach
hereof, either Party's right to commence an action, suit or other proceeding
claiming breach of this Agreement by the other Party shall survive termination.

         Upon any termination of this Agreement, each Party shall promptly
return to the other Party all written Confidential Information, and all copies
thereof, of such other Party and Pfizer shall have no further right with respect
to, and shall cease all activities related to Co-Promotion of the Products.

                                   ARTICLE 14

                  NON-COMPETITION; DETAILING SERVICES AGREEMENT

         14.1     Non-Competition. During the Co-Promotion Term and during the
Term (as defined in the License Agreement), neither Pfizer nor Eyetech nor any
of their Affiliates shall, directly or indirectly, manufacture commercial
quantities of, or market, sell, detail or promote, any Competing Product in the
Territory (excluding the EU, as defined in the License Agreement), except for
the Products as provided in this Agreement and in the License

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Agreement. If (a) either Party terminates this Agreement pursuant to Section
13.2, 13.4 or 13.5 of this Agreement or (b) Pfizer terminates the License
Agreement pursuant to Section 10.1 of the License Agreement, then the
prohibition set forth in the immediately preceding sentence shall, in the case
of a termination described in clause (a) of this sentence, be extended with
respect to the other Party and its Affiliates through a period immediately
following the effective date of such termination of:

                           (i)      [**], if such termination occurs [**],

                           (ii)     [**], if such termination occurs [**], or

                           (iii)    [**], if such termination occurs [**],

and, in the case of a termination described in clause (b) of this sentence, be
extended with respect to Pfizer and its Affiliates through a period immediately
following the effective date of such termination of:

                           (i)      [**], if such termination occurs [**],

                           (ii)     [**], if such termination occurs [**], or

                           (iii)    [**], if such termination occurs [**].

Notwithstanding the foregoing, Eyetech and its Affiliates, either directly or in
collaboration with third parties, shall be entitled to commercialize products
that contain or are based on the Compound (as defined in the License Agreement)
for use outside the Field ("POF"), provided such products are sold under product
trademarks other than the Trademark(s) and are: (a) in a different dosage
strength; (b) in a different formulation; or (c) with a different delivery
system; in each case not intended or developed for use in the Field. Eyetech and
its Affiliates shall not conduct clinical trials or marketing studies with
respect to such POF to support use of such POF in the Field, and Eyetech and its
Affiliates shall require any third party collaborator to comply

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with this undertaking with respect to any POF. Subject to the provisions of
Section 14.2, any breach of this Section 14.1 shall entitle the non-breaching
Party to terminate this Agreement and the Other Product-Related Agreements
pursuant to Section 13.5.

         14.2     Acquisitions Involving Competing Products. Notwithstanding the
provisions of Section 14.1 above, if during the Co-Promotion Term Pfizer or
Eyetech or any of their respective Affiliates acquires or agrees to acquire a
Competing Product in the Territory through acquisition of or merger with a
company or entity, or is acquired or agrees to be acquired by a company or
entity that owns a Competing Product in the Territory, Pfizer or Eyetech, as
applicable, shall have thirty (30) days from the date of public announcement of
the acquisition or merger to notify the other Party as to whether Pfizer or
Eyetech or the acquiring company or entity, as applicable, intends to divest its
interest in such Competing Product. In the event that Pfizer or Eyetech or the
acquiring company or entity, as applicable, elects to divest its interest in
such Competing Product, such Party or the acquiring company or entity shall use
reasonable efforts to identify a third party purchaser to whom such Party or the
acquiring company or entity will divest its interest in such Competing Product
and to enter into a definitive agreement with such third party for such
divestiture as soon as reasonably practicable under the circumstances. If Pfizer
or Eyetech or the acquiring company or entity, as applicable, elects not to
divest its interest in such Competing Product or fails to divest its interest in
such Competing Product within [**] after the closing of the transaction for
which Pfizer or Eyetech, as applicable, has provided the other Party with
notice, then the other Party shall have the option, upon written notice to
Pfizer or Eyetech, as applicable, given no later than ninety (90) days after the
earlier of: (i) Pfizer's or Eyetech's written notice, as applicable, of its
election not to divest such Competing Product; and (ii) the end of such [**]
period described above, to terminate this Agreement and the Other Product-

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Related Agreements pursuant to Section 14.1, treating such election not to
divest or failure to divest such Competing Product as a breach of Section 14.1.
Notwithstanding the provisions of Section 14.1 and this Section 14.2, however,
neither Party shall have the right to terminate this Agreement and the Other
Product-Related Agreements based on the other Party's or its Affiliate's or
acquiring company's or entity's failure to divest its interest in a Competing
Product that is sold only in the EU (as defined in the License Agreement).

         14.3     Detailing Services Agreement; Additional Agreements.

                  (a)      The Detailing Services Agreement shall become
effective only upon the completion of the Pharmacia Merger.

                  (b)      The Parties shall in good faith undertake to identify
an additional Pfizer product for ophthalmic use and potential sale to retinal
specialists, in addition to the products covered by the Detailing Services
Agreement (an "Additional Pfizer Product"). If the Parties are able to identify
and mutually agree upon such Additional Pfizer Product, the Parties will attempt
to negotiate in good faith the terms and conditions of an agreement to allow
Eyetech to detail, co-develop or license such Additional Pfizer Product.

                  (c)      If for any reason (i) the Pharmacia Merger Agreement
is terminated or (ii) Pfizer determines that the Pharmacia Merger cannot be
closed, then, in either event, Pfizer and Eyetech will undertake in good faith
to identify a Pfizer product for ophthalmic use and sale to retinal specialists
to substitute for the products covered by the Detailing Services Agreement (a
"Substitute Product"). If the Parties are able to identify and mutually agree
upon such Substitute Product, the Parties will attempt to negotiate in good
faith the terms and conditions of an agreement to allow Eyetech to detail,
co-develop or license such Substitute Product.

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                  (d)      Notwithstanding the foregoing, neither Party is
obligated to enter into any agreement with the other pursuant to subsections
14.3(b) or 14.3(c). Accordingly, if the Parties are unable to enter into an
agreement respecting an Additional Pfizer Product or Substitute Product, Eyetech
shall have no rights to any such product, and Pfizer shall have no obligations
to Eyetech with respect to any such product or resulting from the Parties'
inability to enter into an agreement pursuant to subsections 14.3(b) or 14.3(c).

                                   ARTICLE 15

                               DISPUTE RESOLUTION

         15.1     Arbitration. Any payment dispute or dispute arising out of any
audit conducted pursuant to Section 9.2 shall be resolved through binding
arbitration as follows:

                  (a)      A Party may submit such dispute to arbitration by
notifying the other Party, in writing, of such dispute. Within thirty (30) days
after receipt of such notice, the Parties shall designate in writing a single
arbitrator to resolve the dispute; provided, however, that if the Parties cannot
agree on an arbitrator within such 30-day period, the arbitrator shall be
selected by the New York, New York office of the American Arbitration
Association (the "AAA"). The arbitrator shall be a lawyer knowledgeable and
experienced in the law concerning the subject matter of the dispute, and shall
not be an Affiliate, employee, consultant, officer, director or stockholder of
any Party.

                  (b)      Within thirty (30) days after the designation of the
arbitrator, the arbitrator and the Parties shall meet, at which time the Parties
shall be required to set forth in writing all disputed issues and a proposed
ruling on the merits of each such issue.

                  (c)      The arbitrator shall set a date for a hearing, which
shall be no later than thirty (30) days after the submission of written
proposals pursuant to Section 15.1(b), to discuss

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each of the issues identified by the Parties. The Parties shall have the right
to be represented by counsel. Except as provided herein, the arbitration shall
be governed by the Commercial Arbitration Rules of the AAA; provided, however,
that the Federal Rules of Evidence shall apply with regard to the admissibility
of evidence.

                  (d)      The arbitrator shall use his or her best efforts to
rule on each disputed issue within thirty (30) days after the completion of the
hearings described in Section 15.1(c). The determination of the arbitrator as to
the resolution of any dispute shall be binding and conclusive upon all Parties.
All rulings of the arbitrator shall be in writing and shall be delivered to the
Parties.

                  (e)      The (i) attorneys' fees of the Parties in any
arbitration, (ii) fees of the arbitrator and (iii) costs and expenses of the
arbitration shall be borne by the Parties as determined by the arbitrator.

                  (f)      Any arbitration pursuant to this Section 15.1 shall
be conducted in New York, New York. Any arbitration award may be entered in and
enforced by a court in accordance with Section 17.2.

         15.2     No Limitation. Nothing in Section 15.1 shall be construed as
limiting in any way the right of a Party to seek a temporary restraining order
or preliminary injunction with respect to any actual or threatened breach of
this Agreement from, or to bring an action in aid of arbitration in, a court in
accordance with Section 17.2. Should any Party seek a temporary restraining
order or preliminary injunction, then for purposes of determining whether to
grant such temporary restraining order or preliminary injunction, the dispute
underlying the request for such temporary restraining order or preliminary
injunction may be heard by a court in accordance with Section 17.2.

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                                   ARTICLE 16

                                   HSR MATTERS

         16.1     HSR Filings. Each of Eyetech and Pfizer shall as promptly as
possible and not later than January 22, 2003 file with the FTC and the Antitrust
Division of the DOJ, any HSR Filing required of it under the HSR Act with
respect to the transactions contemplated by the Transaction Agreements. The
Parties shall cooperate with one another to the extent necessary in the
preparation of any HSR Filing required to be filed under the HSR Act. Each Party
shall be responsible for its own costs, expenses, and filing fees associated
with any HSR Filing.

         16.2     HSR Cooperation; Further Assurances. Eyetech and Pfizer agree,
and shall cause each of their respective Affiliates, to cooperate and to use
their respective commercially reasonable efforts to obtain any HSR Clearance
required for the consummation of the transactions contemplated under the
Transaction Agreements and to respond to any government requests for information
under the HSR Act. The Parties will consult and cooperate with one another, and
consider in good faith the views of one another, in connection with any
analyses, appearances, presentations, memoranda, briefs, arguments, opinions and
proposals made or submitted by or on behalf of either Party in connection with
proceedings under or relating to the HSR Act. For the avoidance of doubt, it is
agreed that neither Party shall be obligated in any way to (a) sell, transfer or
otherwise dispose of (including without limitation by way on any "hold separate"
or similar arrangement) any asset or product or business, (b) terminate any
contractual relationship, or (c) amend, terminate or otherwise modify any
licenses or other intellectual property agreements, in order to obtain HSR
Clearance with respect to the transactions contemplated by the Transaction
Agreements.

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         16.3     Activities Prior to the Effective Date. The Parties shall not
engage in any of the activities contemplated by this Agreement and the Other
Product-Related Agreements, other than seeking to obtain HSR Clearance, prior to
the Effective Date.

                                   ARTICLE 17

                                  MISCELLANEOUS

         17.1     Governing Law. This Agreement shall be governed by and
interpreted in accordance with the internal laws of the State of New York,
without regard to its conflicts of laws rules.

         17.2     Jurisdiction. Except with respect to disputes arising out of
audits conducted pursuant to Section 9.2 or with respect to payment disputes,
which shall be resolved through binding arbitration in accordance with Article
15, each Party (a) irrevocably submits to the exclusive jurisdiction in the
United States District Court for the Southern District of New York and any State
courts sitting in New York, New York (collectively, the "Courts"), for purposes
of any action, suit or other proceeding arising out of this Agreement, and (b)
agrees not to raise any objection at any time to the laying or maintaining of
the venue of any such action, suit or proceeding in any of the Courts,
irrevocably waives any claim that such action, suit or other proceeding has been
brought in an inconvenient forum and further irrevocably waives the right to
object, with respect to such action, suit or other proceeding, that such Court
does not have any jurisdiction over such Party.

         17.3     Waiver. Waiver by a Party of a breach hereunder by the other
Party shall not be construed as a waiver of any succeeding breach of the same or
any other provision. No delay or omission by a Party to exercise or avail itself
of any right, power or privilege that it has or may have hereunder shall operate
as a waiver of any right, power or privilege by such Party. No

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waiver shall be effective unless made in writing with specific reference to the
relevant provision(s) of this Agreement and signed by a duly authorized
representative of the Party granting the waiver.

         17.4     Notices. All notices, instructions and other communications
hereunder or in connection herewith shall be in writing, shall be sent to the
address below and shall be: (a) delivered personally; (b) sent by registered or
certified mail, return receipt requested, postage prepaid; (c) sent via a
reputable nationwide overnight courier service; or (d) sent by facsimile
transmission. Any such notice, instruction or communication shall be deemed to
have been delivered upon receipt if delivered by hand, three (3) Business Days
after it is sent by registered or certified mail, return receipt requested,
postage prepaid, one (1) Business Day after it is sent via a reputable
nationwide overnight courier service, or when transmitted with electronic
confirmation of receipt, if transmitted by facsimile (if such transmission is on
a Business Day; otherwise, on the next Business Day following such
transmission).

Notices to Pfizer shall be addressed to:

              PFIZER INC.
              235 East 42nd Street
              New York, New York 10017-5755
              Telecopy: (212) 808-8652
              Attention: President, Pfizer Pharmaceutical Group

              with a copy to:

              PFIZER INC.
              235 East 42nd Street
              New York, New York 10017-5703
              Telecopy: (212) 808-8924
              Attention: Senior Vice President and General Counsel

Notices to Eyetech shall be addressed to:

              EYETECH PHARMACEUTICALS, INC.
              500 Seventh Avenue

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              18th Floor
              New York, New York 10018
              Telecopy: (212) 997-9251
              Attention: Chief Executive Officer

              with a copy to:

              Hale and Dorr LLP
              60 State Street
              Boston, Massachusetts 02109
              Telecopy: (617) 526-5000
              Attention: David E. Redlick, Esq.

Either Party may change its address by giving notice to the other Party in the
manner provided above.

         17.5     Entire Agreement. This Agreement (including Exhibits),
together with the Other Product-Related Agreements, contains the complete
understanding of the Parties with respect to the Parties' joint development and
commercialization of Products and supersedes all prior understandings and
writings relating to such subject matter. The Parties understand and agree that
this Agreement and the License Agreement are considered to be a single
integrated agreement and contain intellectual property rights and licenses
relating to the Products for which Pfizer has bargained and paid consideration.
If any applicable court of competent jurisdiction determines this Agreement
and/or the License Agreement to be executory in nature, such Transaction
Agreements shall be deemed to be, for purposes of Section 365(n) of the
Bankruptcy Code, licenses of rights to "intellectual property" as defined under
Section 101 of the Bankruptcy Code.

         17.6     Headings. Headings in this Agreement are for convenience of
reference only and shall not be considered in construing this Agreement.

         17.7     Severability. If any provision of this Agreement is held
unenforceable by a court or tribunal of competent jurisdiction because it is
invalid or conflicts with any law of any

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relevant jurisdiction, the validity of the remaining provisions shall not be
affected. In such event, the Parties shall negotiate a substitute provision
that, to the extent possible, accomplishes the original business purpose.

         17.8     Registration and Filing of the Agreement. To the extent, if
any, that a Party concludes in good faith that it is required to file or
register this Agreement or a notification thereof with any Governmental
Authority, including without limitation the US Securities and Exchange
Commission, or the US Federal Trade Commission, in accordance with applicable
Laws, such Party may do so. The other Party shall cooperate in such filing or
notification and shall execute all documents reasonably required in connection
therewith. In such situation, the Parties will request confidential treatment of
sensitive provisions of the Agreement, to the extent permitted by Law. The
Parties shall promptly inform each other as to the activities or inquiries of
any such Governmental Authority relating to this Agreement, and shall cooperate
to respond to any request for further information therefrom.

         17.9     Assignment. Except as otherwise provided herein, including
without limitation in Section 17.11, neither this Agreement nor any of the
rights or obligations hereunder may be assigned by either Party without the
prior consent of the other Party, except assignment, in whole or in part, to an
Affiliate of the assigning Party so long as such Affiliate agrees in writing to
be bound by the terms of this Agreement. The assigning Party shall remain
primarily liable hereunder notwithstanding any such assignment. Any attempted
assignment in violation hereof shall be void.

         17.10    Successors and Assigns. This Agreement shall be binding upon
and inure to the benefit of the Parties hereto and their
respective permitted successors and assigns.

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         17.11    Divestiture by Pfizer.

                  (a)      If (i) Pfizer enters into a definitive agreement to
acquire or merge with another company (the "Target") involving a purchase price
in excess of $[**] (which amount shall be increased on January 1 of each year to
reflect increases in the Consumer Price Index on each such January 1 over the
level of the Consumer Price Index on January 1, 2003), (ii) Pfizer reasonably
believes that a "Divestiture Requirement" exists, namely that the Governmental
Authorities with responsibility for antitrust or competition review and approval
of such acquisition or merger for either the United States or the EU, as defined
in the License Agreement (each an "Antitrust Authority" and, together, the
"Antitrust Authorities") will not grant the requisite clearance or approval for
the consummation of the acquisition or merger unless (x) Pfizer assigns,
sublicenses or otherwise transfers (any such assignment, sublicense or transfer,
a "Divestiture Transaction") Pfizer's rights and obligations under this
Agreement or the License Agreement to a non-Affiliate third party or (y) the
Target divests the business, product line or agreement(s) of the Target (the
"Target's Competitive Business") giving rise to the Divestiture Requirement,
(iii) Pfizer has used commercially reasonable efforts to avoid any requirement
of having to enter into a Divestiture Transaction, including without limitation
if reasonably practicable in Pfizer's good faith business judgment by
undertaking, or causing the Target to undertake, to the relevant Antitrust
Authorities to divest the Target's Competitive Business giving rise to the
antitrust or competition concern and (iv) the Target's Competitive Business
comprised less than [**] percent ([**]%) of the Target's revenues for the
Target's last fiscal year and less than [**] percent ([**]%) of the Target's
fair market value (as determined by Pfizer's Board of Directors in good faith
based on written advice and analysis of a nationally recognized investment
bank), Pfizer shall so notify Eyetech (a "Notice of Divestiture"), which Notice
of Divestiture shall include a detailed description of the Divestiture
Requirement, a certification to

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Eyetech by Pfizer of the accuracy of such description and a copy of the written
advice and analysis of the investment bank. Pfizer may not give more than one
Notice of Divestiture in any twenty-four (24) month period.

         17.11  (b)      If Pfizer gives a Notice of Divestiture, Eyetech may,
at its option (the "Acquisition Option"), elect to acquire Pfizer's rights under
this Agreement and the License Agreement by giving Pfizer notice of such
election (a "Preliminary Acquisition Notice") at any time within ten (10)
Business Days following the date of the Notice of Divestiture. If Eyetech
exercises its Acquisition Option, Pfizer shall promptly discuss with [**]
Eyetech [**] under this Agreement and the License Agreement and [**] referred to
in Section 17.11(c) [**] (as defined below) would be acceptable, with or without
[**] referred to in clause (i) of Section 17.11(d). Promptly after Eyetech gives
a Preliminary Acquisition Notice, the Parties will then jointly select an
investment bank to determine the fair market value of Pfizer's rights under this
Agreement and the License Agreement (the "FMV"). If the Parties are unable to
jointly select an investment bank within [**] Business Days after Eyetech gives
a Preliminary Acquisition Notice, the Parties shall select by a random drawing
an investment bank from among the top ten (10) investment banks from Thomson
Financial's then current listing of top financial advisors for worldwide
completed mergers and acquisitions or, if such directory is not then available,
from an alternative listing of investment banks for mergers and acquisitions to
be mutually agreed by the Parties, to determine the FMV. The investment bank
shall complete its valuation within [**] Business Days of its appointment, and
shall provide its results in writing to both Pfizer and Eyetech. The purchase
price to be paid by Eyetech to Pfizer shall be equal to [**] percent ([**] %) of
the FMV (the "Eyetech Purchase Price"). The results of the valuation shall be
binding on the Parties, and the fees of the investment bank shall be borne [**].

         (c)    If Eyetech wishes to acquire Pfizer's rights under this
Agreement and the License Agreement at the Eyetech Purchase Price, Eyetech shall
provide Pfizer with written notice (the "Confirmatory Acquisition Notice") to
that effect within [**] Business Days of the determination of the FMV; provided
that Eyetech may elect not to purchase Pfizer's rights under this Agreement and
the License Agreement, and if Eyetech does not provide Pfizer with a
Confirmatory Acquisition Notice within such [**] Business Day period after the
determination of FMV, Eyetech shall be deemed to have elected not to purchase
such rights. If Eyetech provides Pfizer with a Confirmatory Acquisition Notice
and [**] indicated that [**] of the [**], (i) Eyetech shall be required [**] of
the [**] at the time [**] between Eyetech and Pfizer, and (ii) Eyetech may [**];
provided that Eyetech may [**] and to [**]. If Eyetech provides Pfizer with a
Confirmatory Acquisition Notice and [**] indicated that such [**], then Eyetech
shall be [**] of the [**] at the time [**] between Eyetech and Pfizer. The
closing of the acquisition transaction shall not occur prior to the later of (x)
closing of Pfizer's acquisition of or merger with the Target and (y) [**] days
after the relevant Notice of Divestiture. Such acquisition transaction shall be
entered into pursuant to an acquisition agreement [**] to such [**], which
acquisition agreement shall contain [**] after the relevant Notice of
Divestiture; provided that such provision shall expire, and Eyetech's
obligations under such acquisition agreement shall no longer be [**], if Eyetech
does not provide Pfizer with a notice of [**] of such [**] within such [**] day
period.

         (d)    If [**] to the [**] referred to in Section 17.11(c), Eyetech
shall [**] to Pfizer [**]. The [**] shall: (i) be [**] to such [**], shall be
[**] by Eyetech in the [**] between Eyetech and Pfizer, and if [**] by Eyetech,
shall be [**] by such [**] as the Parties shall mutually agree, (ii) [**] at an
[**] based on [**] at the time of the transaction, (iii) be [**] (with Eyetech
having the [**] for any or all [**], which accrued interest shall compound and
be added to principal on the date of [**]), (iv) [**] of the date of issuance,
at which time [**] shall be [**], and (v[**] at any time [**].

         (e)    If Eyetech does [**] Pfizer with, [**], its Confirmatory
Acquisition Notice, or is [**] to be [**], then Pfizer may, concurrently with
the [**] with the Target, close a Divestiture Transaction with a [**] so long as
the [**] executes and delivers to Eyetech an agreement to be bound by this
Agreement and the License Agreement. [**] means [**] that is [**] in terms of
[**] in the calendar year most recently completed as of the date [**].

                  (f)      If (x) Pfizer consummates a Divestiture Transaction
or (y) Eyetech acquires Pfizer's rights under this Agreement and the License
Agreement pursuant to this Section 17.11, Pfizer shall, as requested by Eyetech,
either (i) subject to any necessary approval by the Antitrust Authorities,
maintain either or both of the Distribution Agreement and the Regulatory
Services Agreement in effect for such period of time, up to twelve (12) months
following the effective date of the Divestiture Transaction or acquisition by
Eyetech, as Eyetech may request, or (ii) terminate such agreements on the date
or dates specified by Eyetech.

         17.12    Counterparts. This Agreement may be executed in any number of
counterparts, each of which shall be deemed an original but all of which
together shall constitute one and the same instrument.

         17.13    Force Majeure. No Party shall be liable for failure of or
delay in performing obligations set forth in this Agreement, and no Party shall
be deemed in breach of its obligations, if such failure or delay is due to
natural disasters or any causes reasonably beyond the control of such Party.

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         17.14    Non-Solicitation of Employees. During the Co-Promotion Term,
neither Party shall, directly or indirectly, recruit, or solicit any employee of
the other Party with whom such Party has come into contact or interacted for the
purposes of performing this Agreement, without the prior consent of the other
Party, except pursuant to general solicitations not targeted specifically at
such employees or in response to unsolicited employment inquiries by such
employees.

         17.15    Press Releases and Other Disclosures. The Parties hereby each
approve the form of joint press release set forth in Exhibit 17.15 hereto and
will cooperate in the release thereof as soon as practicable after the signature
of this Agreement by the Parties. The Parties also recognize that each Party may
from time to time desire to issue additional press releases and make other
public statements or disclosures regarding the subject matter of this Agreement.
In such event, the Party desiring to issue an additional press release or make a
public statement or disclosure shall provide the other Party with a copy of the
proposed press release, statement or disclosure for review and approval in
advance, which advance approval shall not be unreasonably withheld, conditioned
or delayed. No other public statement or disclosure concerning the existence or
terms of this Agreement shall be made, either directly or indirectly, by either
Party hereto, without first obtaining the written approval of the other Party.
Once any public statement or disclosure has been approved in accordance with
this Section, then either Party may appropriately communicate information
contained in such permitted statement or disclosure. Notwithstanding the
foregoing provisions of this Section 17.15 or of Article 11, a Party may (a)
disclose the existence and terms of the Transaction Agreements where required,
as reasonably determined by the disclosing Party, by applicable Law, by
applicable stock exchange or Nasdaq regulation or by order or other ruling of a
competent court, (b) disclose the existence

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and terms of the Transaction Agreements under obligations of confidentiality to
agents, advisors, contractors, investors and sublicensees, and to potential
agents, advisors, contractors, investors and sublicensees, in connection with
such Party's activities hereunder and in connection with such Party's financing
activities and (c) publicly announce any of the matters set forth in Exhibit
17.15(c), provided that such announcements do not entail disclosure of
non-public technical or scientific information (which, for clarity, excludes
clinical trial results) and the announcing Party provides the other Party with a
copy of the proposed text of such announcement sufficiently in advance of the
scheduled release or publication thereof to afford such other Party a reasonable
opportunity to review and comment upon the proposed text.

         17.16    Third-Party Beneficiaries. None of the provisions of this
Agreement shall be for the benefit of or enforceable by any third party,
including, without limitation, any creditor of either Party. No such third party
shall obtain any right under any provision of this Agreement or shall by reason
of any such provision make any claim in respect of any debt, liability or
obligation (or otherwise) against either Party.

         17.17    Relationship of the Parties. Each Party shall bear its own
costs incurred in the performance of its obligations hereunder without charge or
expense to the other, except as expressly provided in this Agreement. Neither
Party shall have any responsibility for the hiring, termination or compensation
of the other Party's employees or for any employee compensation or benefits of
the other Party's employees. No employee or representative of a Party shall have
any authority to bind or obligate the other Party to this Agreement for any sum
or in any manner whatsoever, or to create or impose any contractual or other
liability on the other Party without said other Party's approval. For all
purposes, and notwithstanding any other provision of this Agreement to the
contrary, Pfizer's legal relationship under this Agreement to Eyetech shall be

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that of independent contractor. Nothing in this Agreement shall be construed to
establish a relationship of partners or joint venturers between the Parties.

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         17.18    Performance by Subsidiaries and Affiliates. To the extent that
this Agreement imposes obligations on Subsidiaries and Affiliates of a Party,
such Party agrees to cause its Subsidiaries and Affiliates to perform such
obligations.

         IN WITNESS WHEREOF, the Parties have signed this Agreement as of the
Execution Date.

PFIZER INC.                         EYETECH PHARMACEUTICALS, INC.

By:    /s/ Henry A. McKinnell       By:    /s/ David R. Guyer
       ______________________              ______________________

Name:  Henry A. McKinnell           Name:  David R. Guyer
       ______________________              ______________________

Title: Chairman and CEO             Title: CEO
       ______________________              ______________________

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                                  EXHIBIT 1.20

                               GROUP/JOINT DETAILS

     Pfizer or Eyetech personnel, as the case may be, may make Product
presentations to medical professionals with prescribing authority in group
situations (each, a "Detailee"). Such presentations maybe be through speaker
programs, dinner and lunch programs, symposia, and other programs the nature of
which has been approved by the CSC.

[**] such a presentation will be considered [**]. It is understood that [**], as
the case may be, [**] For such group presentations conducted by either Eyetech
or Pfizer [**] conducting such presentation. [**] a group presentation, [**]
such a group presentation, [**] If, however, prior to such presentation, [**] It
is understood that for symposia and other group presentations [**] as provided
above. [**]

<PAGE>
                                  EXHIBIT 1.52

                                Call Center Costs

         For purposes of calculating Marketing Expenses, monthly Call Center
expenses shall equal the sum of:

         (i)      $[**]/month* multiplied by the number of full-time equivalent
                  Call Center Representatives (as defined below); and

         (ii)     Out-of-Pocket Costs paid by Pfizer for Call Center services
                  outsourced by Pfizer to non-employee third parties.

         A "Call Center Representative" shall mean a Pfizer employee whose
primary responsibility is to handle calls from or to Product-users, physicians
and other health care professionals, and managed care organizations concerning
questions about the Product and Product reimbursement, or a supervisor of any
such individual.

------------------------------------
* Adjusted annually, with the first such adjustment taking place for the first
full calendar year following the calendar year in which the Product is initially
Launched in the US Territory, according to changes in the Consumer Price Index
for All Urban Consumers (CPI U): U.S. city average, for the preceding Year.

                                      101
<PAGE>

                                   EXHIBIT 2.5

                          Sales Force Training Program

     The initial training Pfizer will offer to Eyetech field force
representatives will be Pfizer's typical training, i.e. "AS IS" program. [**]
various training phases [**]. Pfizer may also update the training program from
time to time. [**]

     [**] training time is [**] during the field time.

     The program includes training [**] subsequent training activities.

     Typical content covered during training consists of:

     -    [**]

     -    [**]

     -    [**]

     -    [**]

     -    [**]

     The program includes material [**]

     [**] appropriate training materials, [**] weeks prior to the training
program commencement. The training of Eyetech Sales Representatives will be
scheduled to coincide with regularly scheduled Pfizer training sessions.

     [**] These include (but are not limited to) topics such as the ones listed
below:

     -    [**]

     -    [**]

     -    [**]

     -    [**]

     -    [**]

     -    [**]

                                      102

<PAGE>

                                 EXHIBIT 3.4(d)

 Matters where Eyetech Possesses Special Expertise or has Special Relationships

                                      [**]

                                      103
<PAGE>

                                 EXHIBIT 3.4(e)

     -    [**]Objectives:

          -    Primary: [**].

     -    Design:

     -    [**]NO-GO Criteria:

     -    [**]LOGISTICS

          -    INITIATION DATE: [**]DURATION: [**]

          -    ESTIMATED COST: [**]

     -    [**] [**]Objectives:

          -    Primary: [**]

     -    Design:

     -    [**]NO-GO Criteria:

          -    [**].

     -    LOGISTICS

          -    INITIATION DATE: [**]DURATION: [**]

ESTIMATED COST: [**]. [**].

     -    Objectives:

     -    [**]Design:

     -    [**]NO-GO Criteria:

     -    [**]LOGISTICS

INITIATION DATE: [**]DURATION: [**]ESTIMATED COST: [**]

                                       104

<PAGE>

[**] Development Programs [**]The Completed and Planned Clinical Studies
     Include:

     -    [**]Objectives:

     -    [**]Design:

     -    [**]NO-GO Criteria:

     -    [**]LOGISTICS

[**] Cost: [**]
[**] . [**]

     -    Objectives:

     -    [**]Design:

     -    [**]NO-GO Criteria:

     -    [**]LOGISTICS

     -    [**]. [**]Objectives:

     -    [**]Design:

     -    [**]NO-GO Criteria:

     -    [**]LOGISTICS

          -    [**]Cost: 2.0 MM

     -    EOP1002 (COMPLETED): Phase I/II. [**]Objectives:

     -    [**]Design:

     -    [**]NO-GO Criteria:

     -    [**]LOGISTICS

     -    [**]Objectives:

     -    [**]Design:

     -    [**]NO-GO Criteria:

     -    [**]Logistics

          -    Initiation Date: Ongoing[**]Duration: [**] 3Q04 completion

     -    Estimated Cost: [**]. [**]Objectives:

     -    [**]Design:

     -    [**]NO-GO Criteria:

     -    [**]LOGISTICS

          -    INITIATION DATE: [**]DURATION: [**]

          -    ESTIMATED COST: [**]

[**] [**]

     -    Objectives

     -    Primary: [**]Design:

     -    [**]NO-GO Criteria:

     -    [**]LOGISTICS

          -    INITIATION DATE: [**]

          -    DURATION: [**]

          -    ESTIMATED COST: [**]

                                       105

<PAGE>

     -    [**] [**]Objectives

     -    [**]Design:

     -    [**]NO-GO Criteria:

          -    [**].

     -    LOGISTICS

          -    INITIATION DATE: [**]DURATION: [**]

     -    ESTIMATED COST: [**]. [**]Objectives:

     -    [**]Design:

     -    [**]NO-GO Criteria:

     -    [**]LOGISTICS

          -    INITIATION DATE: [**]DURATION: [**]ESTIMATED COST: [**]

[**].  [**]

     -    Objectives:

          -    [**].

     -    Design:

     -    [**]NO-GO Criteria:

     -    [**]LOGISTICS

          -    INITIATION DATE: [**]

          -    DURATION: [**]

          -    ESTIMATED COST: [**]

          -

[**] [**]

     -    Objectives:

          -    Primary: [**]

     -    Design:

     -    [**]NO-GO Criteria:

          -    [**].

     -    LOGISTICS

          -    INITIATION DATE: [**]DURATION: [**]

          -    ESTIMATED COST: [**]

     -    [**] [**]Objectives:

     -    [**]Design:

          -    [**]

     -    NO-GO Criteria:

     -    [**]LOGISTICS

                                       106

<PAGE>

          -    INITIATION DATE: [**]DURATION: [**]

[**] [**]

     -    Objectives

     -    [**]Design:

     -    [**]NO-GO Criteria:

     -    [**]LOGISTICS

          -    INITIATION DATE: [**]DURATION: [**].

     -    ESTIMATED COST: [**]. [**]Objectives

     -    [**]Design:

     -    [**]NO-GO Criteria:

     -    [**]LOGISTICS

          -    INITIATION DATE: [**]DURATION: [**]

          -    ESTIMATED COST: [**]

                                       107

<PAGE>

                                 EXHIBIT 5.1(b)

                                      [**]

Note: all numbers in Millions of US dollars

<TABLE>
<CAPTION>
                      REMAINING
STUDY NUMBER/NAME    COSTS IN CDP    [**]
-----------------------------------------
<S>                  <C>             <C>
      [**]                           [**]
-----------------------------------------
      [**]                           [**]
-----------------------------------------
      [**]                           [**]
-----------------------------------------
      [**]                           [**]
-----------------------------------------
      [**]               [**]        [**]
-----------------------------------------
      [**]               [**]        [**]
-----------------------------------------
      [**]               [**]        [**]
-----------------------------------------
      [**]              $[**]        [**]
-----------------------------------------
      [**]              $[**]        [**]
-----------------------------------------
      [**]              $[**]        [**]

-----------------------------------------
      [**]              $[**]        [**]
-----------------------------------------
      [**]              $[**]        [**]
-----------------------------------------
      [**]              $[**]        [**]
-----------------------------------------
      [**]              $[**]        [**]
-----------------------------------------
      [**]              $[**]        [**]
-----------------------------------------
      [**]              $[**]

-----------------------------------------
      [**]              $[**]
-----------------------------------------
      [**]              $[**]
-----------------------------------------
      [**]              $[**]
-----------------------------------------
</TABLE>

<TABLE>
<CAPTION>
                         [**]
                      REMAINING
STUDY NUMBER/NAME    COSTS IN CDP    [**]
-----------------------------------------
<S>                  <C>             <C>
-----------------------------------------
      [**]              $[**]        [**]

-----------------------------------------
      [**]              $[**]        [**]

-----------------------------------------
      [**]              $[**]
-----------------------------------------
      [**]              $[**]
-----------------------------------------
      [**]              $[**]
-----------------------------------------
      [**]              $[**]        [**]
                         [**]
-----------------------------------------
</TABLE>

                                       108

<PAGE>

<TABLE>
<S>                  <C>             <C>
-----------------------------------------
      [**]              $[**]
-----------------------------------------
</TABLE>

                                       109

<PAGE>

                                   EXHIBIT 6.2

                  Marketing Budgets and Detailing Requirements

     Marketing Budgets.  After Launch of the first AMD Product in the US
Territory, the following shall apply:

     Eyetech shall [**] set forth below. Pfizer shall [**]

<TABLE>
<S>     <C>     <C>     <C>     <C>
------------------------------------
[**]    [**]    [**]    [**]    [**]

------------------------------------
[**]    [**]    [**]    [**]
                                [**]
------------------------------------
</TABLE>

*Beginning with the [**] and thereafter [**] Marketing Expenses shall be
calculated as follows:

[**]

     Detailing Requirements.  The following principles shall apply to the
allocation of Detailing responsibilities between the Parties:

     (i)       [**] Eyetech shall [**] Detailing [**] of the Details [**] in
performing Details [**]

     (ii)      Pfizer shall [**] in performing Details [**]

     (iii)     Eyetech shall [**] detailing responsibilities.

     (iv)      [**] Eyetech shall [**] detailing responsibilities [**] under
this Agreement. [**]

     (v)       Detailing assignments shall be consistent with the principles
set forth in (i) to (iv) above, shall be set forth in each applicable Marketing
Plan [**]

<TABLE>
<S>     <C>     <C>     <C>     <C>
------------------------------------
        [**]    [**]    [**]    [**]

------------------------------------
[**]
------------------------------------
[**]    [**]    [**]    [**]    [**]
------------------------------------
[**]    [**]    [**]    [**]
------------------------------------
[**]
------------------------------------
[**]    [**]    [**]    [**]
------------------------------------
[**]    [**]    [**]    [**]
------------------------------------
</TABLE>

                                       110

<PAGE>

                                 EXHIBIT 6.12(a)

                     Pre-Existing Clinical Supply Agreements

1.   [**] Agreement dated [**] between Eyetech and [**]

2.   Purchase Order dated [**] between Eyetech and [**]

3.   Purchase Order dated [**] between Eyetech and [**]

4.   [**] between Eyetech and [**]

5.   [**] dated [**] between Eyetech and [**]

6.   Purchase Order dated [**] between Eyetech [**]

                                       111

<PAGE>

                                  EXHIBIT 10.4

                             Third Party Agreements

1.   Licensing Agreement dated as of March 30, 2000, by and among Eyetech,
     Gilead Sciences, Inc. and NeXstar Pharmaceuticals, Inc., as amended by
     Amendment No. 1 dated May 9, 2000 and as subsequently amended by Amendment
     No. 2 dated December 4, 2001 and as subsequently amended by Amendment No. 3
     dated August 30, 2002.

2.   License Agreement dated as of December 31, 2001, by and between Eyetech and
     Isis Pharmaceuticals, Inc.

3.   License, Manufacturing and Supply Agreement dated as of February 5, 2002,
     by and between Eyetech and Shearwater Corporation.

                                       112

<PAGE>

                              EXHIBIT 12.6(a)(iii)

                        Certain Product Liability Matters

Product Liability arising out of any claim by a patient enrolled as of the
Execution Date in an ongoing Eyetech clinical trial based on safety issues
related to Eyetech's pre-clinical testing program (other than reproductive
studies).

                                       113

<PAGE>

                             EXHIBIT 12.6(b)(iii)(A)

                       Eyetech 2002 Clinical Supply Costs

                            Direct Cost Estimate API
                                 Current (2002)

                                Clinical Product

API Yield per Run (grams) from                             [**]
    [**]mM Batch Size

<TABLE>
<CAPTION>
                                 $/Batch    $/gram
                                 -----------------
<S>                              <C>        <C>
Raw Material (critical)            [**]      [**]

Contract Cost [**]                $[**]     $[**]

Release Cost (QC/QA)              $[**]     $[**]

Total Direct Cost (API)           $[**]     $[**]
</TABLE>

Cost/gram = $[**]

Cost/mg = $[**]

Cost of [**]mg fill = ([**])*[**]*$[**] = $[**]
Note: [**]mg dose has a [**]% overfill

                                       114

<PAGE>

                             EXHIBIT 12.6(b)(iii)(B)

                    Certain Third Party Intellectual Property

                                      [**]

                                       115

<PAGE>

                                  EXHIBIT 17.15

                               Joint Press Release

For immediate release:                    Contacts: Justin Jackson
December 18, 2002                         212-213-0006
                                          (Burns McClellan on behalf of Eyetech)
                                          Geoffrey Cook
                                          212-733-5244 (Pfizer)

           PFIZER, EYETECH PHARMACEUTICALS ENTER GLOBAL COLLABORATION

                      FOR POTENTIAL TREATMENT FOR BLINDNESS

         New York, NY, December 18, 2002 - Pfizer Inc and Eyetech
Pharmaceuticals, Inc. today announced they have entered into an agreement to
jointly develop and commercialize Eyetech's Macugen(TM) (pegaptanib sodium), a
potential treatment for age-related macular degeneration (AMD) and diabetic
macular edema (DME), both leading causes of blindness.

         Under terms of the deal, which is subject to government approval,
Pfizer will make initial payments of $100 million, with the potential for an
additional $195 million in milestone payments based on worldwide regulatory
submission and approvals. Eyetech also has the potential to receive up to an
additional $450 million in milestone payments, which are contingent upon
successful commercialization of Macugen(TM) and based on attainment of
agreed-upon sales levels. Pfizer will also fund the majority of the ongoing
development costs for both the AMD and DME indications. Further, if approved,
Macugen(TM) will be co-promoted by Eyetech and Pfizer in the United States where
Eyetech will have an ophthalmology sales force and record sales. Outside of the
United States, Pfizer will market the product exclusively under a
royalty-bearing license. Additional payments are subject to worldwide
Macugen(TM) sales. Further terms of the deal were not disclosed.

         This is a landmark accomplishment for a young biotechnology company. We
are excited to partner with the world's leading pharmaceutical company to bring
a potentially innovative

                                       116

<PAGE>

therapy to so many patients who are at risk of losing their sight," said Dr.
David Guyer, Eyetech Pharmaceuticals' co-founder and chief executive officer.

         The U.S. Food and Drug Administration has granted Macugen(TM)
"fast-track" status for the treatment of exudative, or "wet" form of AMD as well
as for DME because of the product's expected potential to fulfill a significant
unmet medical need.

         "We are very pleased to partner with Eyetech on what we believe will be
a breakthrough treatment for a devastating medical condition," said Pfizer
President Karen Katen. "As the world's population ages, there will be an
increasing number of people at risk for macular degeneration."

         Administered by intravitreal injection, Macugen(TM) is an aptamer that
selectively binds to and neutralizes Vascular Endothelial Risk Factor (VEGF). In
early clinical studies, Macugen(TM) was shown to inhibit abnormal blood vessel
growth and stabilize and/or reverse blood vessel leakage in the back of the eye
resulting in improved vision by three lines or more on standard eye charts in 26
percent of patients.

         Eyetech's Phase III development program for wet AMD involves nearly
1,200 patients at 117 investigational sites in the United States, Canada, South
America, Europe, Israel and Australia, the largest clinical development program
of its kind. Macugen(TM) is being developed as monotherapy as well as in
combination with photodynamic therapy.

                   WET AGE-RELATED MACULAR DEGENERATION (AMD)

         The leading cause of irreversible vision loss among Americans over the
age of 55, AMD occurs in two different forms: dry AMD and wet AMD. The wet form
accounts for approximately 200,000 new cases annually, with a prevalence of 1.2
million cases in the United States alone.

         Wet AMD is characterized by the growth of abnormal blood vessels into
the area beneath the retina. This process, known as angiogenesis or
neovascularization, results in fragile blood vessels that leak fluid and blood
into the macula, the center portion of the retina. This leakage damages the area
and results in a rapid loss of central vision, which is critical for tasks such
as reading, driving, watching television and recognizing faces.

                                       117

<PAGE>

         Laser photocoagulation and photodynamic therapy are the only current
treatments for certain types of patients.

                          DIABETIC MACULAR EDEMA (DME)

         DME affects roughly 135,000 Americans with diabetes each year and is
the leading cause of blindness in adults under the age of 55. The decreased
vision that characterizes DME results from fluid and lipids leaking from retinal
blood vessels

         Eyetech Pharmaceuticals (www.eyetk.com) is dedicated to the discovery,
development and commercialization of novel therapeutics and delivery systems to
combat the vision loss associated with ophthalmic diseases. Founded in 2000, the
privately-held, New York City-based company is focused on meeting the medical
needs of patients with diseases that affect the back of the eye. Its investors
include partners and affiliates of JP

         Morgan, BB Biotech, MPM Capital, Alta Partners, Schroder Ventures, Life
Sciences and International BioTechnology Trust plc, and Merrill Lynch KECALP.
Pfizer Inc discovers, develops, manufactures and markets leading prescription
medicines, for humans and animals, and many of the world's best-known consumer
brands.

         DISCLOSURE NOTICE: The information contained in this document is as of
         December 18, 2002. Pfizer assumes no obligation to update any
         forward-looking statements contained in this document as a result of
         new information or future events or developments.

         This document contains forward-looking information about a product in
         development that involves inherent uncertainties. The success of this
         research and development project and the speed with which regulatory
         authorizations and the launch of the product may be achieved, as well
         as competitive factors, could affect the actual outcome of this
         collaboration.

         A further list and description of the risks, uncertainties and other
         matters that could cause the Pfizer's description contained herein to
         differ materially can be found in the Company's Annual Report on Form
         10-K for the fiscal year ended December 31, 2001, and in its periodic
         reports on Forms 10-Q and 8-K (if any).

                                       118

<PAGE>

                                EXHIBIT 17.15(c)

Permitted Disclosures[**]

                                       119

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