OSI PHARMACEUTICALS INC
10-Q, 1998-08-14
IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES
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<PAGE>   1

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM 10-Q

(Mark One)

/X/      QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
         EXCHANGE ACT OF 1934

For the quarterly period ended June 30, 1998.
         
                                       OR

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

For the transition period from          to             .

Commission file number           0-15190

                            OSI Pharmaceuticals, Inc.
             (Exact name of registrant as specified in its charter)

    Delaware                                                     13-3159796
 (State or other jurisdiction of                              (I.R.S. Employer
 incorporation or organization)                              Identification No.)

    106 Charles Lindbergh Boulevard, Uniondale, New York             11553
 (Address of principal executive offices)                         (Zip Code)

                                  516-222-0023
              (Registrant's telephone number, including area code)


(Former name, former address and former fiscal year, if changed since last
report.)

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


                      APPLICABLE ONLY TO CORPORATE ISSUERS:

At July 31, 1998 the registrant had outstanding 21,382,668 shares of common
stock $.01 par value.
<PAGE>   2
                   OSI PHARMACEUTICALS, INC. AND SUBSIDIARIES

                                    CONTENTS
                                                                        Page No.

PART I - FINANCIAL INFORMATION.............................................   3
Item 1.    Financial Statements                                              
                                                                             
           Consolidated Balance Sheets                                       
           - June 30, 1998 and September 30, 1997..........................   3
                                                                             
           Consolidated Statements of Operations                             
           - Three months ended June 30, 1998 and 1997.....................   5
                                                                             
           Consolidated Statements of Operations                             
           - Nine months ended June 30, 1998 and 1997......................   6
                                                                             
           Consolidated Statements of Cash Flows                             
           - Nine months ended June 30, 1998 and 1997......................   7
                                                                             
           Notes to Consolidated Financial Statements......................   9
                                                                             
Item 2.    Management's Discussion and Analysis of Financial                 
           Condition and Results of Operations.............................  10
                                                                             
Item 3.    Quantitative and Qualitative Disclosures about Market Risk......  13
                                                                             
PART II - OTHER INFORMATION................................................  14
                                                                             
Item 1.    Legal Proceedings...............................................  14
                                                                             
Item 2.    Changes in Securities...........................................  14
                                                                             
Item 3.    Defaults Upon Senior Securities.................................  14
                                                                             
Item 4.    Submission of Matters to a Vote of Security Holders.............  14
                                                                             
Item 5.    Other Information...............................................  14
                                                                             
Item 6.    Exhibits and Reports on Form 8-K................................  15
                                                                             
SIGNATURES.................................................................  17
                                                                             
EXHIBIT INDEX..............................................................  18
                                                                           
<PAGE>   3
                          PART I. FINANCIAL INFORMATION

ITEM 1.     FINANCIAL STATEMENTS

                   OSI PHARMACEUTICALS, INC. AND SUBSIDIARIES
                           CONSOLIDATED BALANCE SHEETS
<TABLE>
<CAPTION>
                                                    June 30,        September 30,
Assets                                               1998               1997
- ------                                            -----------       ------------
                                                  (unaudited)
<S>                                               <C>               <C>        
Current assets:
     Cash and cash equivalents                    $10,151,173       $ 8,636,634
     Short-term investments                        14,725,153        23,198,035
     Receivables, including
         trade receivables of $344,473 and
         $350,100 at June 30,1998 and
         September 30, 1997, respectively           2,234,328         1,215,672
     Interest receivable                              337,753           475,800
     Grants receivable                                318,898           179,740
     Prepaid expenses and other                       988,696           820,151
                                                  -----------       -----------
                  Total current assets             28,756,001        34,526,032
                                                  -----------       -----------

Property, equipment and leasehold
     improvements - net                             7,915,832         7,752,286
Compound library assets - net                       5,946,305         6,800,406
Loans to officers and employees                         9,317            34,317
Other assets                                        2,254,022         1,287,782
Intangible assets - net                             8,089,186         9,184,742
                                                  -----------       -----------
                                                  $52,970,663       $59,585,565
                                                  ===========       ===========
Liabilities and Stockholders' Equity
Current liabilities:
     Accounts payable and accrued expenses        $ 3,138,247       $ 4,180,039
     Current portion of unearned revenue            1,677,306           733,377
                                                  -----------       -----------
                  Total current liabilities         4,815,553         4,913,416
                                                  -----------       -----------

Other liabilities:
     Loan payable                                      69,175           151,985
     Deferred acquisition costs                       660,886           630,796
     Accrued postretirement benefits cost           1,095,596           944,500
                                                  -----------       -----------
                  Total liabilities                 6,641,210         6,640,697
                                                  -----------       -----------
</TABLE>

                                   (continued)

                                      -3-
<PAGE>   4
                   OSI PHARMACEUTICALS, INC. AND SUBSIDIARIES
                     CONSOLIDATED BALANCE SHEETS (CONTINUED)
<TABLE>
<CAPTION>

                                                        June 30,            September 30,
Liabilities and Stockholders' Equity (cont'd)             1998                  1997
- ------------------------------------                  ------------          -------------
                                                      (unaudited)
<S>                                                    <C>                  <C>         
Stockholders' equity:
     Common stock, $.01 par value;
         50,000,000 shares authorized,
         22,277,256 and 22,262,220
         issued and outstanding at
         June 30, 1998 and
         September 30, 1997, respectively                  222,773              222,622
     Additional paid-in capital                        104,933,063          104,864,056
     Treasury stock, at cost 897,838 shares at
         June 30, 1998 and September 30, 1997           (6,284,866)          (6,284,866)
     Accumulated deficit                               (52,409,897)         (45,657,713)
     Cumulative translation adjustments                    (61,320)            (101,531)
     Unrealized holding loss on
         short-term investments                            (70,300)             (97,700)
                                                     -------------        -------------
                  Total stockholders' equity            46,329,453           52,944,868
                                                     -------------        -------------

Commitments and contingencies
                                                     $  52,970,663        $  59,585,565
                                                     =============        =============
</TABLE>

          See accompanying notes to consolidated financial statements.

                                      -4-
<PAGE>   5
                   OSI PHARMACEUTICALS, INC. AND SUBSIDIARIES
                      CONSOLIDATED STATEMENTS OF OPERATIONS
                                   (UNAUDITED)

<TABLE>
<CAPTION>
                                                      Three Months Ended
                                                            June 30,
                                                     ----------------------
                                                   1998                  1997
                                                -----------         ------------
<S>                                             <C>                 <C>         
Revenues:
     Collaborative program revenues,
         principally from related parties       $  3,958,441        $  2,867,641
     Sales                                           362,839             221,506
     Other research revenue                          318,897             494,294
     License revenues                                702,422                   0
                                                ------------        ------------
                                                   5,342,599           3,583,441
                                                ------------        ------------

Expenses:
     Research and development                      5,546,401           4,430,170
     Selling, general and administrative           1,952,975           1,849,149
     Amortization of intangibles                     365,185             365,188
                                                ------------        ------------

                                                   7,864,561           6,644,507
                                                ------------        ------------

                  Loss from operations            (2,521,962)         (3,061,066)

Other income (expense):
     Net investment income                           346,246             480,520
     Other                                           (23,881)            (24,140)
                                                ------------        ------------

Net loss                                        $ (2,199,597)       $ (2,604,686)
                                                ============        ============

Weighted average number of shares
     of common stock outstanding                  21,373,522          21,299,407
                                                ============        ============

Basic net loss per share                        $       (.10)       $       (.12)
                                                ============        ============
</TABLE>



          See accompanying notes to consolidated financial statements.


                                      -5-
<PAGE>   6
                   OSI PHARMACEUTICALS, INC. AND SUBSIDIARIES
                      CONSOLIDATED STATEMENTS OF OPERATIONS
                                   (UNAUDITED)

<TABLE>
<CAPTION>

                                                       Nine Months Ended
                                                            June 30,
                                                       ------------------
                                                     1998                1997
                                                ------------        -----------
<S>                                             <C>                 <C>         
Revenues:
     Collaborative program revenues,
         principally from related parties       $ 11,401,317        $  9,239,373
     Sales                                           796,903             825,542
     Other research revenue                        1,058,705           1,000,770
     License revenues                                702,422                   0
                                                ------------        ------------
                                                  13,959,347          11,065,685
                                                ------------        ------------

Expenses:
     Research and development                     15,084,796          12,374,413
     Selling, general and administrative           5,475,129           5,435,527
     Amortization of intangibles                   1,095,555           1,095,554
                                                ------------        ------------

                                                  21,655,480          18,905,494
                                                ------------        ------------

                  Loss from operations            (7,696,133)         (7,839,809)

Other income (expense):
     Net investment income                         1,132,853           1,617,505
     Other                                          (188,904)            (67,521)
                                                ------------        ------------

Net loss                                        $ (6,752,184)       $ (6,289,825)
                                                ============        ============

Weighted average number of shares
     of common stock outstanding                  21,369,805          21,699,641
                                                ============        ============

Basic net loss per share                        $       (.32)       $       (.29)
                                                ============        ============
</TABLE>


          See accompanying notes to consolidated financial statements.


                                      -6-
<PAGE>   7
                   OSI PHARMACEUTICALS, INC. AND SUBSIDIARIES
                      CONSOLIDATED STATEMENTS OF CASH FLOWS
                                   (UNAUDITED)
<TABLE>
<CAPTION>

                                                                 Nine Months Ended
                                                                       June 30,
                                                                 ------------------
                                                              1998                1997
                                                         -------------       -------------
<S>                                                      <C>                 <C>          
Cash flows from operating activities:
     Net loss                                            $ (6,752,184)       $ (6,289,825)
     Adjustments to reconcile net loss
         to net cash used by operating activities:
     Gain (loss) on sale of investments                        (5,310)             16,775
     Depreciation and amortization                          1,379,586           1,116,742
     Amortization of library assets                         1,352,216             826,132
     Amortization of intangibles                            1,095,556           1,095,554
     Amortization of warrants                                  30,090              30,091
     Foreign exchange (gain) loss                              40,211             (27,500)

     Changes in assets and liabilities:
     Receivables                                           (1,018,656)            977,523
     Interest receivable                                     (139,158)             40,486
     Grants receivable                                        138,047              52,896
     Prepaid expenses and other                              (168,545)           (677,112)
     Other assets                                            (966,240)           (644,022)
     Accounts payable
         and accrued expenses                              (1,041,792)           (188,336)
     Unearned revenue                                         943,929             457,875
     Accrued postretirement
         benefits cost                                        151,096             112,896
                                                         ------------        ------------
Net cash used by
     operating activities                                $ (4,961,154)       $ (3,099,825)
                                                         ------------        ------------

Cash flows from investing activities:
     Additions to short-term investments                 $ (2,742,898)       $ (3,942,582)
     Maturities and sales of short-term investments        11,248,490          10,870,979
     Additions to library assets                             (498,115)            (99,624)
     Additions to property, equipment and
         leasehold improvements                            (1,543,132)         (1,992,422)
Net change in loans to officers and employees                  25,000               2,683
                                                         ------------        ------------
Net cash provided by investing activities                $  6,489,345        $  4,839,034
                                                         ------------        ------------
</TABLE>

                                   (continued)


                                      -7-
<PAGE>   8
                   OSI PHARMACEUTICALS, INC. AND SUBSIDIARIES
                CONSOLIDATED STATEMENTS OF CASH FLOWS (CONTINUED)
                                   (UNAUDITED)
<TABLE>
<CAPTION>

                                                   Nine Months Ended
                                                         June 30,
                                                  -----------------------
                                                  1998                1997
                                            -------------        --------------
<S>                                         <C>                  <C>          
Cash flows from financing activities:
    Proceeds from exercise of stock options 
         and employee stock purchase plan          69,158             200,880
    Net change in loans payable                   (82,810)             98,243
    Purchase of treasury stock                          0          (8,750,000)
                                             ------------        ------------
Net cash used by financing activities        $    (13,652)       $ (8,450,877)
                                             ------------        ------------

Net (decrease) increase in cash
    and cash equivalents                        1,514,539          (6,711,668)
Cash and cash equivalents at
    beginning of period                         8,636,634          13,409,866
                                             ------------        ------------
Cash and cash equivalents at end of period   $ 10,151,173        $  6,698,198
                                             ============        ============
Issuance of treasury stock for
    acquisition of license to the Dow 
    Compound Library                                    0        $  2,500,000
                                             ============        ============
</TABLE>


          See accompanying notes to consolidated financial statements.


                                      -8-
<PAGE>   9
                   OSI PHARMACEUTICALS, INC. AND SUBSIDIARIES
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                                   (UNAUDITED)

(1)      Basis of Presentation

In the opinion of management, the accompanying unaudited consolidated financial
statements contain all adjustments (consisting of only normal recurring
accruals) necessary to present fairly the financial position of OSI
Pharmaceuticals, Inc. and its subsidiaries (the "Company") as of June 30, 1998
and September 30, 1997, its results of operations for the three and nine months
ended June 30, 1998 and 1997 and its cash flows for the nine months ended June
30, 1998 and 1997. Certain reclassifications have been made to the prior period
financial statements to conform them to the current presentation.

It is recommended that these consolidated financial statements be read in
conjunction with the consolidated financial statements and notes thereto in the
Company's 1997 Annual Report on Form 10-K.

Results for interim periods are not necessarily indicative of results for the
entire year.

Net loss per share of common stock outstanding is based on the weighted average
number of shares outstanding. Common share equivalents (stock options) are not
included in the computation for the three months and nine months ended June 30,
1998 and 1997 since their inclusion would be anti-dilutive.

(2)      License Agreement with Aurora Biosciences Corporation

Pursuant to a License Agreement effective May 26, 1998, the Company granted to
Aurora Biosciences Corporation ("Aurora") a non-exclusive worldwide license to
practice the technology under the Company's patent for live cell gene
transcription assays utilizing a reporter gene. The Company also granted Aurora
an option to obtain a non-exclusive license to practice the technology under the
Company's patent concerning methods of transcription modulation. The duration of
each license is to be coextensive with the life of the last to expire of the
underlying patents. Aurora has the right to grant sublicenses. The Company
received 75,000 shares of Aurora's common stock with an estimated fair market
value of $400,000 and a license fee of $300,000 upon execution of the agreement.
In addition, Aurora will pay the Company milestone payments and royalties on
sales of products derived from the licensed patents, if any. The Company has
exclusive control over prosecution, maintenance and enforcement of the patents
subject to the agreement.

(3)      Research Agreements

(a)      Modification of Co-Venture with Sepracor, Inc.

Pursuant to an Amendatory and Collaborative Agreement dated April 1, 1998, the
Company and Sepracor, Inc. ("Sepracor") amended their Collaborative Research
Development and Commercialization Agreement dated March 7, 1997, terminating
certain provisions contained therein, including, without limitation, provisions
establishing the research program. Each party will be free to independently
pursue the discovery of new compounds in the anti-infective area without
incurring any responsibility to the other party. To the extent Sepracor
commercializes certain compounds arising out of the joint venture, however, it
will pay royalties to the Company. The Company will provide discovery biology
and certain other services to Sepracor until September 1, 1998, in exchange for
fees from Sepracor subject to extension on a quarterly basis.

(b)      Collaboration with Fujirebio, Inc.

The Company, through its wholly-owned subsidiary, Oncogene Science Diagnostics,
Inc., entered into a Research Collaboration and License Agreement with
Fujirebio, Inc. ("Fujirebio") effective April 1, 1998, creating a collaborative
program focused on discovering and developing certain proprietary cancer assays
and commercializing cancer diagnostic products. Under the agreement, Fujirebio
is to fund the Company's research and development of cancer assays over a
four-year term. The Company is to provide Fujirebio with antibodies, antigens
and other substances necessary to manufacture the diagnostic products derived
from the collaboration. Further, the Company has granted to Fujirebio a
non-exclusive license to, among other things, develop, manufacture and sell the
products developed pursuant to the collaboration in Japan in exchange for
license fees and royalties on product sales. The duration of the license is to
be coextensive with the lives of the patents related to the licensed products.
Each of the parties has rights and obligations to prosecute and maintain patent
rights related to specified areas of the research under the agreement. The
agreement is subject to early termination by either party in the event of
certain defaults.

(c)      Alliance with Vanderbilt University

Effective as of April 28, 1998, the Company entered into a Collaborative
Research, Option and Alliance Agreement with Vanderbilt University
("Vanderbilt") to conduct a collaborative research program and seek a corporate
partner to fund a technology collaboration for the discovery and development of
drugs to treat diabetes. The collaborative research is funded by the Company in
exchange for which the Company has the option to negotiate a commercially
reasonable, worldwide, exclusive license from Vanderbilt to develop, make, use,
and sell, products derived from the research program. The Company and Vanderbilt
will commit equal resources to the program, including, among other things,
access to all their respective laboratory facilities and dedicated teams of
research scientists. The Company has certain rights and obligations to prosecute
and maintain patent rights related to specified areas of the research under the
agreement. The agreement is for a term of one year, but shall be automatically
extended upon the execution of a third-party research collaboration agreement
for the term of such collaboration. Each party is prohibited from entering, on
its own without the other party, into a funded collaboration agreement with a
third party for drug discovery in the area of diabetes using certain targets
which are the subject of the collaboration.

(4)      Recombinant TGF-Beta 3 Collaboration

In May 1998, Novartis Pharma AG ("Novartis"), the Company's collaborative
partner in the development of TGF-Beta 3 for wound healing and oral mucositis
indications, found that patients treated with TGF-Beta 3 in its Phase II
clinical trials for both indications showed no statistical improvement with
regard to primary clinical end points (e.g., wound closure) compared to patients
treated with placebos. The Company and Novartis are in discussions regarding the
development of TGF-Beta 3 for other indications.


                                      -9-
<PAGE>   10
ITEM 2.   MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND
          RESULTS OF OPERATIONS

THREE AND NINE MONTHS ENDED JUNE 30, 1998 AND 1997

REVENUES

Revenues for the three and nine months ended June 30, 1998 were approximately
$5.3 million and $14.0 million, respectively, representing an increase of $1.8
million or 49%, and an increase of $2.9 million or 26%, respectively, compared
to revenues of $3.6 million and $11.1 million, respectively, reported for the
three and nine months ended June 30, 1997. Collaborative program revenues
increased approximately $1.1 million or 38% and increased approximately $2.2
million or 23%, respectively. The three month increase is primarily due to the
commencement on October 1, 1997 of the funded phase of the collaborative
research and license agreement among the Company, Anaderm Research Corp.
("Anaderm") and Pfizer Inc. ("Pfizer"), as well as an increased level of
research in the collaborative program with Sankyo Company, Ltd. ("Sankyo") to
discover and develop novel pharmaceutical products to treat influenza. The nine
month increase is primarily due to the Anaderm and Sankyo programs and was
partially offset by a decrease in revenues related to the Company's
collaborative program with Hoechst Marion Roussel, Inc. ("HMRI") to discover and
develop small molecules that induce gene expression of the protein
erythropoietin. This decrease in revenues resulted from the Company's
receipt of a $1 million initiation fee from HMRI in the erythopoletin program in
the second quarter of 1997 and reduced funding in connection with the extension
of the first phase of this pragram in April 1998. The nine month increase in
revenue was also offset by the completion, on December 31, 1996, of the funded
discovery phase of the Company's collaborative program with Wyeth-Ayerst
Laboratories relating to the discovery and development of drugs for the
treatment of diabetes and osteoporosis. Sales revenue, representing primarily
service revenue from the pharmaceutical division of the Company's Aston
Molecules Ltd. ("Aston") subsidiary, which the Company acquired in September
1996, increased approximately $141,000 or 64% compared to the prior three-month
period and decreased $29,000 or 3% compared to the prior nine-month period. The
decrease was primarily due to the Company's decision to devote certain of
Aston's resources to internal programs as opposed to sales outside the Company.
Other research revenues, representing primarily government grants and other
research grants, decreased approximately $175,000 or 35%, and increased
approximately $58,000 or 6%, respectively, for the three and nine months ended
June 30, 1998 compared to the three and nine months ended June 30, 1997. The
Company recognized license revenue of approximately $700,000 for the three and
nine months ended June 30, 1998 from the signing of a license agreement on May
26, 1998 with Aurora Biosciences Corporation ("Aurora") covering the Company's
gene transcription patent estate. Under the terms of the agreement, the Company
received 75,000 shares of Aurora common stock with a fair market value of
approximately $400,000 and $300,000 in cash for Aurora's non-exclusive license
and certain sub-licensing rights to the Company's reporter gene patent, and
options to the Company's methods of modulation patent. The Company anticipates
entering into additional licensing agreements for these patents in the future.

EXPENSES

The Company's operating expenses increased by approximately $1.2 and $2.7
million or 18% and 15%, respectively, for the three 


                                      -10-
<PAGE>   11
and nine months ended June 30, 1998 compared to the three and nine months ended
June 30, 1997. Research and development expenses increased approximately $1.1
and $2.7 million, or 25% and 22%, respectively. The increase was due to: (1) the
expansion of the Company's joint venture with Anaderm for the discovery and
development of novel compounds to treat pigmentation disorders, wrinkles and
baldness; (2) the joint venture with Sepracor, Inc. ("Sepracor") for the
discovery of certain anti-infective and anti-inflammatory agents, which
commenced in March 1997; and (3) the collaborative agreement with Sankyo for the
discovery and development of novel pharmaceutical products to treat influenza,
which commenced in February 1997. Also contributing to the increase in expenses
were costs associated with the expansion of the Company's natural products
discovery and medicinal chemistry operations at its MYCOsearch, Inc.
("MYCOsearch") and Aston subsidiaries.

OTHER INCOME AND EXPENSE

Investment income decreased approximately $134,000 and $485,000 or 28% and 30%,
respectively, for the three and nine months ended June 30, 1998 compared to the
three and nine months ended June 30, 1997. This decrease relates to the decrease
in the principal balance invested.

LIQUIDITY AND CAPITAL RESOURCES

At June 30, 1998, working capital (representing primarily cash, cash equivalents
and short-term investments) aggregated approximately $23.9 million. The Company
is dependent upon collaborative research revenues, government research grants,
interest income and cash balances, and will remain so until products developed
from its technology are successfully commercialized.

In connection with the formation of Helicon Therapeutics, Inc. ("Helicon") in
July 1997, the Company agreed to perform $1 million of molecular screening
services for Helicon through approximately July 1998 (and grant to Helicon a
non-exclusive license with respect to certain screening technology) in exchange
for its shares of Helicon's capital stock. Helicon is to provide research
funding to the Company for the second and third years of the initial three-year
term of this program. In addition, pursuant to its agreement with Pfizer and
Anaderm, the Company will contribute approximately $800,000 in drug discovery
resources (including assay biology, high throughput screening, lead optimization
and chemistry) to Anaderm in fiscal 1998 and, assuming Anaderm achieves certain
milestones, approximately an additional $1 million in such resources through
fiscal 1999.

The Company believes that with the funding from its collaborative research
programs, government research grants, interest income, and cash balances, its
financial resources are adequate for its operations for approximately the next
three to four years based on its current business plan even if no milestone
payments or royalties are received during this period. However, the Company's
capital requirements may vary as a result of a number of factors, including, but
not limited to, competitive and technological developments, funds required for
further expansion or enhancement of the Company's technology platform (including
possible 


                                      -11-
<PAGE>   12
additional joint ventures, collaborations and acquisitions), potential milestone
payments, and the time and expense required to obtain governmental approval of
products, some of which factors are beyond the Company's control.

One of the Company's strategic objectives is to manage its financial resources
and the growth of its drug discovery and development programs so as to balance
its proprietary efforts and co-ventures with its funded collaborations. In
pursuing this objective, the Company has expanded the scope of its discovery and
development activities without significantly increasing its rate of cash
consumption. The Company expects to continue its current level of
expenditures and capital investment over the next several years to enhance its
drug discovery technologies, pursue internal proprietary drug discovery
programs, and to commit resources to co-ventures with pharmaceutical companies.

Examples of the Company's co-ventures with pharmaceutical companies include the
formation of Helicon in July 1997 with Cold Spring Harbor Laboratory and
Hoffman-La Roche Inc., and the formation of Anaderm in April 1996 with Pfizer
and New York University. Generally the Company expects to commit greater
resources to such programs in exchange for greater commercialization rights, as
compared to its traditional collaborative research programs in which the Company
receives research funding and royalties on sales of commercialized products. If
the developmental activities on which one or more of these ventures are focused
are successful, then the Company will be required to make substantial additional
capital investment in such venture(s) in order to maintain its percentage
participation.

There can be no assurance that scheduled payments will be made by third parties,
that current agreements will not be canceled, that government research grants
will continue to be received at current levels, that milestone payments will be
made, or that unanticipated events requiring the expenditure of funds will not
occur. Further, there can be no assurance that the Company will be able to
obtain any additional required funds on acceptable terms, if at all. Failure to
obtain additional funds when required would have a material adverse effect on
the Company's business, financial condition and results of operations.

YEAR 2000 COMPLIANCE

The Company is currently working to resolve the potential impact of the Year
2000 problem on the processing of date-sensitive information by the Company's
computerized information systems. The Year 2000 problem is the result of
computer programs being written using two digits (rather than four) to define an
applicable year. Substantially all of the Company's biology and chemistry
databases are stored on Oracle tables and ISIS chemical structure databases,
which are Year 2000 compliant, as are its Novell network servers. The Company
currently plans to convert its financial records to an Oracle based system and
is in the process of implementing a new planning and budgeting package, both of
which are Year 2000 compliant. The Company expects these systems to be
operational by December 31, 1999. Based on current 


                                      -12-
<PAGE>   13
information, the cost of addressing remaining potential Year 2000 problems
associated with the Company's internal systems and operations are not expected
to have a material adverse impact to the Company's financial position, results
of operations, or cash flows in future periods.

The Company has not conducted an evaluation of the extent to which the 
operations of the material third parties with whom it regularly deals may be 
disrupted by any Year 2000 non-compliance of any of their systems. These third 
parties include the Company's collaborative partners and co-venturers, and its 
suppliers and vendors. Disruption of the operations of any of its partners or 
co-venturers could delay or halt important research and development programs, 
cause the loss of data or have other unforeseen consequences. Year 2000 
problems experienced by the Company's suppliers and vendors could cause a 
disruption of the Company's operations. The Company currently is unable to 
estimate the likelihood of any of these risks being realized, or if realized, 
the impact they may have on the Company. Any such occurrence could have a 
material adverse effect on the Company's business, financial condition and 
results of operations.

NEW ACCOUNTING PRONOUNCEMENTS

In 1997, the Financial Accounting Standards Board issued Statement of Financial
Accounting Standards ("SFAS") No. 130, "Reporting Comprehensive Income," SFAS
No. 131, "Disclosures about Segments of an Enterprise and Related Information,"
and SFAS No. 132, "Employers' Disclosures about Pensions and Other
Postretirement Benefits." SFAS No. 130 establishes standards for reporting and
display of comprehensive income and its components. SFAS No. 131 establishes
standards for reporting information about operating segments and related
disclosures about products and services, geographic areas and major customers.
SFAS No. 132 revises current disclosure requirements for employers' pensions and
other retiree benefits. These standards are effective for years beginning after
December 15, 1997. These standards expand or modify current disclosures and,
accordingly, will have no impact on the Company's reported financial position,
results of operations and cash flows.

FORWARD LOOKING STATEMENTS

Certain of the matters and subject areas discussed in this report that are not
statements of current or historical fact are "forward-looking statements" that
convey information about potential future circumstances and developments. These
forward-looking statements are necessarily based on various assumptions, involve
known and unknown risks and generally are subject to the inherent risks and
uncertainties surrounding expectations regarding future occurrences. As a
result, the Company's actual future experience may differ materially from the
results, achievements or performance described or implied in such statements.
Factors that might cause the Company's actual future experience to differ
materially from the forward-looking statements include, but are not limited to,
(i) the Company's absence of commercialized drug products, (ii) the Company's
dependence on third parties for clinical development and commercialization of
potential products, (iii) the potential failure of the Company's lead compound
currently in clinical trials to progress successfully through clinical
development, (iv) the potential failure of any drug candidates that emerge from
the Company's discovery operations to progress successfully to or through
clinical development, (v) competition, (vi) government regulation, (vii)
pharmaceutical pricing and (viii) the effect of any internal or external Year
2000 problems. Certain of these and additional factors that may cause the
Company's actual future experience to differ materially from the forward-looking
statements contained in this report are discussed in Exhibit 99 to the Company's
annual report on Form 10-K for the fiscal year ended September 30, 1997.


ITEM 3.   QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

                  Not applicable.



                                      -13-
<PAGE>   14
                           PART II. OTHER INFORMATION

ITEM 1.  LEGAL PROCEEDINGS

         Not applicable.

ITEM 2.  CHANGES IN SECURITIES

         Not applicable.

ITEM 3.  DEFAULTS UPON SENIOR SECURITIES

         Not applicable.

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

         Not applicable.

ITEM 5.  OTHER INFORMATION

MODIFICATION OF CO-VENTURE WITH SEPRACOR, INC.

         Pursuant to an Amendatory and Collaborative Agreement dated April 1,
1998, the Company and Sepracor, Inc. ("Sepracor") amended their Collaborative
Research Development and Commercialization Agreement dated March 7, 1997,
terminating certain provisions contained therein, including, without limitation,
provisions establishing the research program. Each party will be free to
independently pursue the discovery of new compounds in the anti-infective area
without incurring any responsibility to the other party. To the extent Sepracor
commercializes certain compounds arising out of the joint venture, however, it
will pay royalties to the Company. The Company will provide discovery biology
and certain other services to Sepracor until September 1, 1998, in exchange for
fees from Sepracor subject to extension on a quarterly basis.

COLLABORATION WITH FUJIREBIO, INC.

         The Company, through its wholly-owned subsidiary, Oncogene Science
Diagnostics, Inc., entered into a Research Collaboration and License Agreement
with Fujirebio, Inc. ("Fujirebio") effective April 1, 1998, creating a
collaborative program focused on discovering and developing certain proprietary
cancer assays and commercializing cancer diagnostic products. Under the
agreement, Fujirebio is to fund the Company's research and development of cancer
assays over a four-year term. The Company is to provide Fujirebio with
antibodies, antigens and other substances necessary to manufacture the
diagnostic products derived from the collaboration. Further, the Company has
granted to Fujirebio a non-exclusive license to, among other things, develop,
manufacture and sell the products developed pursuant to the collaboration in
Japan in exchange for license fees and royalties on product sales. The duration
of the license 


                                      -14-
<PAGE>   15
is to be coextensive with the lives of the patents related to the licensed
products. Each of the parties has rights and obligations to prosecute and
maintain patent rights related to specified areas of the research under the
agreement. The agreement is subject to early termination by either party in the
event of certain defaults.

LICENSE TO AURORA BIOSCIENCES CORPORATION

          Pursuant to a License Agreement effective May 26, 1998, the Company
granted to Aurora Biosciences Corporation ("Aurora") a non-exclusive worldwide
license to practice the technology under the Company's patent for live cell gene
transcription assays utilizing a reporter gene. The Company also granted Aurora
an option to obtain a non-exclusive license to practice the technology under the
Company's patent concerning methods of transcription modulation. The duration of
each license is to be coextensive with the life of the last to expire of the
underlying patents. Aurora has the right to grant sublicenses. The Company
received 75,000 shares of Aurora's common stock with an estimated fair market
value of $400,000 and a license fee of $300,000 upon execution of the agreement.
In addition, Aurora will pay the Company milestone payments and royalties on
sales of products derived from the licensed patents, if any. The Company has
exclusive control over prosecution, maintenance and enforcement of the patents
subject to the agreement. 

ALLIANCE WITH VANDERBILT UNIVERSITY

          Effective as of April 28, 1998, the Company entered into a
Collaborative Research, Option and Alliance Agreement with Vanderbilt University
("Vanderbilt") to conduct a collaborative research program and seek a corporate
partner to fund a technology collaboration for the discovery and development of
drugs to treat diabetes. The collaborative research is funded by the Company in
exchange for which the Company has the option to negotiate a commercially
reasonable, worldwide, exclusive license from Vanderbilt to develop, make, use,
and sell, products derived from the research program. The Company and Vanderbilt
will commit equal resources to the program, including, among other things,
access to all their respective laboratory facilities and dedicated teams of
research scientists. The Company has certain rights and obligations to prosecute
and maintain patent rights related to specified areas of the research under the
agreement. The agreement is for a term of one year, but shall be automatically
extended upon the execution of a third-party research collaboration agreement
for the term of such collaboration. Each party is prohibited from entering, on
its own without the other party, into a funded collaboration agreement with a
third party for drug discovery in the area of diabetes using certain targets
which are the subject of the collaboration.

RECOMBINANT TGF-BETA 3 COLLABORATION

          In May 1998, Novartis Pharma AG ("Novartis"), the Company's
collaborative partner in the development of TGF-Beta 3 for wound healing and
oral mucositis indications, found that patients treated with TGF-Beta 3 in its
Phase II clinical trials for both indications showed no statistical improvement
with regard to primary clinical end points (e.g., wound closure) compared to
patients treated with placebos. The Company and Novartis are in discussions
regarding the development of TGF-Beta 3 for other indications.

ITEM 6.  EXHIBITS AND REPORTS ON FORM 8-K

         (a) EXHIBITS

                  3.1      Certificate of Incorporation, as amended (1)

                  3.2      By-Laws, as amended (2)

                                      -15-
<PAGE>   16
                  10.1     Employment Agreement, dated April 30, 1998, between
                           the Company and Colin Goddard, Ph.D.

                  *10.2    Amendatory and Collaborative Agreement, dated as of
                           March 31, 1998, by and between the Company and
                           Sepracor, Inc.

                  *10.3    Research Collaboration and License Agreement, dated
                           as of April 1, 1998, by and among the Company,
                           Oncogene Science Diagnostics, Inc. and Fujirebio,
                           Inc.

                  *10.4    License Agreement, dated as of May 26, 1998, by and
                           between the Company and Aurora Biosciences
                           Corporation.

                  27       Financial Data Schedule

                  ---------------
                  (1)      Included as an exhibit to the Company's quarterly
                           report on Form 10-Q for the quarter ended December
                           31, 1997, filed on February 17, 1998, and
                           incorporated herein by reference.

                  (2)      Included as an exhibit to the Company's registration
                           statement on Form S-3 (File No. 333-937) initially
                           filed on February 14, 1996, and incorporated herein
                           by reference.

                  *        Portions of this exhibit have been redacted and are
                           the subject of a confidential treatment request filed
                           with the Secretary of the Securities and Exchange
                           Commission pursuant to Rule 24b-2 under the
                           Securities Exchange Act of 1934, as amended.


         (b)      REPORTS ON FORM 8-K

                  None.


                                      -16-
<PAGE>   17
                                   SIGNATURES

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



                                     OSI PHARMACEUTICALS, INC.
                                     -------------------------
                                              (Registrant)



Date:    August 14, 1998             /s/ Gary E. Frashier
                                     -----------------------------
                                     Gary E. Frashier
                                     Chief Executive Officer



Date:    August 14, 1998             /s/ Robert L. Van Nostrand
                                     -----------------------------------
                                     Robert L. Van Nostrand
                                     Vice President and Chief Financial Officer
                                     (Principal Financial Officer)


                                      -17-
<PAGE>   18
                                  EXHIBIT INDEX

        Exhibit No.           Description

         3.1      Certificate of Incorporation, as amended (1)

         3.2      By-Laws, as amended (2)

         10.1     Employment Agreement, dated April 30, 1998, between the
                  Company and Colin Goddard, Ph.D.

         *10.2    Amendatory and Collaborative Agreement, dated as of March 31,
                  1998, by and between the Company and Sepracor, Inc.

         *10.3    Research Collaboration and License Agreement, dated as of
                  April 1, 1998, by and among the Company, Oncogene Science
                  Diagnostics, Inc. and Fujirebio, Inc.

         *10.4    License Agreement, dated as of May 26, 1998, by and between
                  the Company and Aurora Biosciences Corporation.

         27       Financial Data Schedule


         -------------------
         (1)      Included as an exhibit to the Company's quarterly report on
                  Form 10-Q for the quarter ended December 31, 1997, filed on
                  February 17, 1998, and incorporated herein by reference.

         (2)      Included as an exhibit to the Company's registration statement
                  on Form S-3 (File No. 333-937) initially filed on February 14,
                  1996, and incorporated herein by reference.

         *        Portions of this exhibit have been redacted and are the
                  subject of a confidential treatment request filed with the
                  Secretary of the Securities and Exchange Commission pursuant
                  to Rule 24b-2 under the Securities Exchange Act of 1934, as
                  amended.


                                      -18-

<PAGE>   1
                              EMPLOYMENT AGREEMENT


         EMPLOYMENT AGREEMENT, dated as of April 30,1998, between OSI
PHARMACEUTICALS, INC., a Delaware corporation having a place of business at 106
Charles Lindbergh Blvd., Uniondale, NY 11553 (the "Company"), and Colin Goddard,
Ph.D., who resides at 10 Ashley Loop, Fort Salonga, NY 11768 ("Executive").

                                   WITNESSETH:

         WHEREAS, the Company desires to engage Executive to perform services
for the Company and any subsidiary or affiliate of the Company, and Executive
desires to perform such services, on the terms and conditions hereinafter set
forth; and

         WHEREAS, the Company and Executive have determined to terminate their
prior employment agreement dated April 28, 1993 and enter into this agreement;

         NOW, THEREFORE, the Company and Executive, in consideration of the
mutual promises contained herein and other good and valuable consideration, the
receipt, adequacy and sufficiency of which are hereby acknowledged, hereby agree
as follows: 

         1.       Term. The Company hereby employs Executive, and Executive 
hereby accepts such employment, upon the terms and conditions hereinafter set
forth. Executive shall perform the duties required of him hereunder during the
period commencing on May 1, 1998 and ending on April 30, 2001; provided,
however, that on April 30, 2001, and on each April 30 thereafter, such period
shall be automatically extended by one additional year unless at least 60 days
prior to any such April 30 either party shall deliver to the other written
notice that such period will not be extended, in which case this Agreement will
terminate upon the expiration of this then existing term of this Agreement,
including any previous extension. The 


<PAGE>   2
period during which Executive shall perform the services required of him
hereunder (as same may be extended as provided in this Section 1 or reduced as
hereinafter provided) is hereinafter referred to as the "Employment Period."

         2.       Duties.

                  (a)      Executive shall serve, at the pleasure of the Board 
of Directors of the Company, as President of the Company. In his capacities as
President shall perform for the Company, and any subsidiary or affiliate of the
Company, such duties generally associated with such position as well as such
other duties consistent with such position as may be prescribed from time to
time by the Board of Directors.

                  (b)      Executive agrees to devote his full time, labor, 
energies and attention to the performance of his duties hereunder, subject to
the provisions of Paragraph 10(a) hereof.

                  (c)      Executive agrees not to become involved in any 
personal investment or business matters which may detract from the performance
of his duties or otherwise adversely affect the Company or any subsidiary or
affiliate of the Company.

         3.       Place of Performance. In connection with his employment by the
Company, Executive shall be based at the principal executive offices of the
Company, but shall be available to travel at such times and to such places as
may be reasonably necessary in connection with the performance of his duties
hereunder.

         4.       Compensation.

                  (a)      Base Salary. During the Employment Period, Executive 
shall receive a minimum base salary at the annual rate of $192,000, plus such
other amounts, if any, as the Board of Directors of the Company, in its sole
discretion, may from time to time determine.


                                      2
<PAGE>   3
Executive's base salary shall be reviewed annually; provided, however, that in
no event shall Executive's base salary be reduced below an annual rate of
$192,000. Executive's salary shall be payable in bi-weekly installments or at
such other frequency as the Company may from time to time determine.

                  (b)      Incentive Bonus Opportunity. In addition to his base
salary, Executive may receive incentive bonus compensation in respect of each
fiscal year ending during the Employment Period. The amount, if any, of each
such Annual Award shall be determined by the Board of Directors of the Company
in its sole discretion. Executive shall not receive any Annual Award unless he
is employed by the Company at the end of the fiscal year to which such Annual
Award relates. Any Annual Award will be paid to Executive within 120 days
following the end of the fiscal year to which such Annual Award relates.

         5.       Stock Options. Executive shall be eligible to receive stock 
options as the Board of Directors of the Company shall determine in its sole
discretion and in accord with established Company policy and incentive goals. 

         6.       Expenses.

                  (a)      During the Employment Period, Executive shall be 
entitled to reimbursement for all reasonable out-of-pocket expenses necessarily
incurred in performing services hereunder within the limits of authority which
may be established from time to time by the Board of Directors, provided that
Executive properly accounts for such expenses in accordance with Company policy.

                                       3
<PAGE>   4
         7.       Employee Benefits.

                  (a)      Use of Automobile. The Company shall provide 
Executive with the use of an automobile during the Employment Period and shall
reimburse Executive for his reasonable and necessary expenses in connection with
the use of such vehicle in furtherance of the business of the Company, provided
that Executive properly accounts for such expenses in accordance with Company
policy.

                  (b)      Vacation. Executive shall be entitled to one month 
paid vacation per calendar year which may be taken at such time or times as
Executive may elect, subject to the needs of the Company's business. Executive
shall also be entitled to all paid holidays given by the Company to its senior
executive officers.

                  (c)      Other Benefits. Executive shall be entitled to 
participate in such term life insurance, basic medical, major medical, dental
and other employee benefit plans established by the Company from time to time
and generally made available to employees at levels similar to Executive's for
which he meets the eligibility requirements.

         8.       Termination.

                  (a)      The Company may terminate this Agreement at any time 
after the first anniversary of the date of commencement of the Employment
Period, and for any reason whatsoever (or for no reason), by giving not less
than 30 days' prior written notice to Executive. In the event this Agreement is
terminated by the Company other than for a reason set forth in Paragraph 8(b)
hereof, (i) Executive shall be entitled to receive his base salary at the rate
in effect on the date notice of termination is given through the effective date
of such termination and any Annual Award granted through such date which has not
yet been paid; 


                                       4
<PAGE>   5
and (ii) Executive shall continue to receive his base salary at the rate in
effect on the date notice of termination is given for the twelve months
immediately succeeding the effective date of such termination.

                  (b)      Notwithstanding anything herein contained to the 
contrary, if after the date hereof and prior to the end of the Employment
Period, (i) either (A) Executive shall be physically or mentally incapacitated
or disabled or otherwise unable fully to discharge his duties hereunder
("Disabled") for a period of 90 consecutive days or for an aggregate of 90 days
within any period of twelve consecutive months, (B) Executive shall be convicted
of a felony or other crime involving moral turpitude, (C) Executive shall commit
any act or omit to take any action in bad faith and to the detriment of the
Company or any subsidiary or affiliate of the Company, or (D) Executive shall
breach any material term of this Agreement and fail to correct such breach
within 10 days after receiving notice of the same, then, and in each such case,
the Company shall have the right to give notice of termination of Executive's
services hereunder as of a date to be specified in such notice (which date may
be the date such notice is given), and this Agreement shall terminate on the
date so specified; or (ii) Executive shall die, then this Agreement shall
terminate the date of Executive's death.

         If this Agreement is terminated by the Company for any of the reasons
set forth in this Paragraph 8(b), Executive or his estate, as the case may be,
shall be entitled to receive his base salary at the rate in effect on the date
notice of termination is given or the date of Executive's death, as the case may
be, to the date on which termination shall take effect and any Annual Award
granted through such date which has not been paid; provided, however that if
Executive is Disabled, the amount payable to Executive pursuant to this
Paragraph 8(b) shall

                                       5
<PAGE>   6
be reduced by an amount equal to the amounts, if any, to which he is entitled
with respect to such period pursuant to any insurance or other plan established
by the Company in which he is a participant.

         (c)      Termination by the Employee. The Executive may terminate this
agreement after the date herein if in the event of a change of control of the
Company or for any other reason his title, responsibilities or salary are
reduced from those in effect at the time and he shall be entitled to full
payment for the remaining term of this Agreement. However, the payment shall not
be less than nine months pay in any event. Upon such termination, all
outstanding stock options granted to the Executive shall become fully vested.

         (d)      Executive may terminate this agreement if, within one year of 
the effective date, the Board of Directors does not nominate the Executive for
election as Chief Executive Officer and as a director of the Company. Executive
shall continue to receive his base salary at the rate in effect on the date of
notice of termination for the 12 months succeeding such notice.

         9.       Confidentiality.

                  (a)      Executive shall continue to treat as confidential any
proprietary, confidential or secret information relating to the business or
interests of the Company or any subsidiary or affiliate of the Company,
including, without limitation, the organizational structure, operations,
business plans or technical projects of the Company or any subsidiary or
affiliate of the Company, and any research datum or result, invention, trade
secret, customer list, process or other work product developed by or for the
Company or any subsidiary or affiliate of the Company, whether on the premises
of the Company or elsewhere ("Confidential 

                                       6
<PAGE>   7
Information"). Beginning on the date hereof, and at any time hereafter,
Executive shall not disclose, utilize or make accessible in any manner or in any
form any Confidential Information other than in connection with performing the
services required of him under this Agreement, without the prior written consent
of the Company. Notwithstanding the foregoing, the provisions of this Paragraph
9(a) shall not apply to any proprietary, confidential or secret information or
other research datum or result, invention, trade secret, customer list or work
product which is, at the commencement of this Agreement or at some later date,
publicly known under circumstances involving no breach of this Agreement or is
lawfully and in good faith made available to Executive by a third party under no
obligation of confidentiality with respect thereto. 

                  (b)      Executive hereby agrees that any and all information,
inventions and discoveries, whether or not patentable, that he conceives and/or
creates during the Employment Period and any extensions thereof, and which are a
direct or indirect result of work performed hereunder, shall be the sole and
exclusive property of the Company. Executive hereby assigns to the Company any
and all right, title and interest which he has or may acquire in the same.
Executive further agrees that he will promptly execute any and all applications,
assignments or other instruments which an officer of the Company or the Board of
Directors of the Company shall deem necessary or useful in order to apply for
and obtain Letters Patent in the United States and all foreign countries for
said information, inventions and discoveries and in order to assign and convey
to the Company the sole and exclusive right, title and interest in and to said
information, inventions, discoveries, patent applications and patents thereon.
The Company will bear the cost of preparation of all such patent applications


                                       7
<PAGE>   8
and assignments, and the cost of prosecution of all such patent applications in
the United States Patent Office and in the patent offices of foreign countries.

                  (c)      All documents, records, apparatus, equipment and 
other physical property furnished to Executive by the Company or produced by
Executive or others in connection with his employment shall be and remain the
sole property of the Company. Executive will return and deliver such property to
the Company as and when requested by the Company.

                  (d)      Executive agrees that the provisions of this 
Paragraph 9 shall survive the termination of his employment and of this
Agreement.

         10.      Non-Competition.

                  (a)      Executive agrees that, during the period he is 
employed by the Company or any subsidiary or affiliate of the Company, under
this Agreement or otherwise, he will not engage in, or otherwise directly or
indirectly be employed by, or act as a consultant, advisor or lender to, or be a
director, officer, employee, stockholder, owner or partner of, any other
business or organization, whether or not such business or organization now is or
shall then be competing with the Company or any parent, subsidiary or affiliate
of the Company; provided, however, that Executive shall not be prohibited either
from managing his own personal investments on his own personal time or from
serving on up to three outside boards of directors or advisory boards, so long
as such activities do not (i) involve a business or organization which competes
with the Company or any subsidiary or affiliate of the Company, (ii) interfere
or conflict with the performance of his duties as an employee of the Company or
any subsidiary or affiliate of the Company, (iii) otherwise result in a breach
of any of the 


                                       8
<PAGE>   9
provisions of this Agreement, or (iv) in the case of serving as a director or
advisory board member of other companies, such activities for all such companies
do not require, in the aggregate, more than 15 days per year, including travel
time.

         Executive further agrees that (y) if his employment with the Company is
terminated by the Company pursuant to Paragraphs 8(a) or 8(b)(i) hereof, or (z)
if he resigns or otherwise fails or refuses to perform the services required of
him under this Agreement other than as a result of a breach of this Agreement by
the Company (which breach is not cured within 30 days after receiving notice
thereof), then during the two-year period commencing on the date he ceases to be
employed by any of the Company or any subsidiary or affiliate of the Company,
under this Agreement or otherwise, Executive shall not directly or indirectly
compete with or be engaged in the same business as the Company or any subsidiary
or affiliate of the Company, or be employed by, or act as consultant, advisor or
lender to, or be a director, officer, employee, stockholder, owner or partner
of, any business or organization which, at the time of such cessation, directly
or indirectly competes with or is engaged in the same business as the Company or
any subsidiary or affiliate of the Company; provided, however, that if
Executive's employment with the Company is terminated pursuant to Paragraphs
8(a) or 8(b)(i)(A) hereof, Executive's obligations pursuant to this sentence
shall continue only so long as the Company pays Executive compensation at the
same rate compensation was being paid to him pursuant to Paragraph 4 of this
Agreement at the time of such termination (subject, in the case of termination
pursuant to Paragraphs 8(a). Notwithstanding anything contained herein to the
contrary, the provisions of this Paragraph 10(a) will not be deemed breached
merely because Executive owns not more than 1% of the


                                       9
<PAGE>   10
outstanding common stock of a corporation if, at the time of its acquisition by
Executive, such stock is listed on a national securities exchange, is reported
on NASDAQ, or is regularly traded in the over-the-counter market by a member of
a national securities exchange.

                  (b)      Executive agrees that for a period of three years 
from the termination of this Agreement he will not, directly or indirectly,
employ or solicit the employment or engagement by others of any employees of, or
consultants hired by, the Company, or any subsidiary or affiliate of the
Company, without the prior written consent of the Company.

                  (c)      The obligations of Executive pursuant to this 
Paragraph 10 shall survive the termination of this Agreement.

         11.      Equitable Relief. Executive acknowledges that the restrictions
contained in Paragraphs 9 and 10 of this Agreement are reasonable in view of the
nature of the business in which the Company is engaged and the knowledge he will
obtain concerning the Company's business (and the business of any subsidiary or
affiliate of the Company), and that any breach of his obligations under
Paragraphs 9 and 10 hereof will cause the Company irreparable harm for which the
Company will have no adequate remedy at law. As a result, the Company shall be
entitled to the issuance by a court of competent jurisdiction of an injunction,
restraining order or other equitable relief in favor of itself restraining
Executive from committing or continuing any such violation, and Executive
consents to such an injunction, restraining order or other equitable relief. Any
right to obtain an injunction, restraining order or other equitable relief
hereunder will not be deemed a waiver of any right to assert any other remedy
the Company may have under this Agreement or otherwise at law or in equity. 



                                       10
<PAGE>   11
         12.      Representations and Warranties. Executive represents and 
warrants to the Company that (i) Executive is under no contractual or other
restriction or obligation which is inconsistent with the execution of this
Agreement, the performance of his duties hereunder or the other rights of the
Company and any subsidiary or affiliate of the Company hereunder, and (ii)
Executive is under no physical or mental disability that would hinder the
performance by him of his duties under this Agreement.

         13.      Assignment. Under no circumstances shall Executive assign, 
pledge or otherwise dispose of any of his rights or obligations under this
Agreement, and any such attempted assignment, pledge or disposition shall be
void and shall, at the Company's option, relieve the Company of all its
obligations under this Agreement. The Company may assign any of its rights or
obligations under this Agreement to any parent, subsidiary, affiliate or
successor.

         14.      Entire Agreement. This Agreement and the stock option 
agreements referred to in Paragraph 5 hereof represent the entire agreement
between the Company and Executive with respect to the subject matter hereof and
there have been no oral or other agreements of any kind whatsoever as a
condition precedent or inducement to the signing of this Agreement or otherwise
concerning this Agreement or the subject matter hereof.

         15.      Waivers. Any waiver of any breach of any terms or conditions 
of this Agreement shall not operate as a waiver of any other breach of such
terms or conditions or any other term or condition, nor shall any failure to
enforce any provision hereof on any one occasion operate as a waiver of such
provision or of any other provision hereof or a waiver of the right to enforce
such provision or any other provision on any subsequent occasion.

                                       11
<PAGE>   12
         16.      Amendments. This Agreement may not be amended, nor shall any
waiver, change, modification, consent or discharge be effected, except by an
instrument in writing executed by or on behalf of the party against whom
enforcement of any such amendment, waiver, change, modification, consent or
discharge is sought.

         17.      Severability.

                  (a)      If any provision of this Agreement shall be held or
deemed to be invalid, inoperative or unenforceable as written, it shall be
construed, to the greatest extent possible, in a manner which shall render it
valid and enforceable and any limitation on the scope or duration of any such
provision necessary to make it valid and enforceable shall be deemed to be part
thereof.

                  (b)      If any provision of this Agreement shall be held or
deemed to be invalid, inoperative or unenforceable as applied to any particular
case in any jurisdiction or jurisdictions, or in all jurisdictions or in all
cases, because of the conflict or any provision with any constitution or statute
or rule of public policy or for any other reason, such circumstance shall not
have the effect of rendering the provision or provisions in question invalid,
inoperative or unenforceable in any other jurisdiction or in any other case or
circumstance or of rendering any other provision or provisions herein contained
invalid, inoperative or unenforceable to the extent that such other provisions
are not themselves actually in conflict with such constitution, statute or rule
of public policy, but this Agreement shall be reformed and construed in any such
jurisdiction or case as if such invalid, inoperative or unenforceable provision
had never been contained herein, and such provision reformed so that it would be


                                       12
<PAGE>   13
valid, operative and enforceable to the maximum extent permitted in such
jurisdiction or in such case.

         18.      Governing Law. This Agreement shall be governed by and
construed and enforced in accordance with the laws of the State of New York
without giving effect to rules governing conflict of laws.

         19.      Courts. Any action to enforce any of the provisions of this
Agreement may be brought in the courts of the State of New York. The parties
hereby consent to the jurisdiction of the courts of the State of New York.

         20.      Notices. Any notice or other communication required or
permitted by this Agreement shall be in writing and personally delivered or
mailed by certified mail, return receipt requested, addressed to the parties at
their addresses set forth above, or to such other addresses as one party may
specify to the other party, from time to time, in writing. Any notice or other
communication given by certified mail shall be deemed given at the time of
certification thereof, except for a notice changing a party's address which
shall be deemed given at the time of receipt thereof.

         21.      Counterparts. This Agreement may be executed in one or more
counterparts, each of which shall be deemed to be an original but all of which
together will constitute one and the same instrument. 


                                       13
<PAGE>   14
IN WITNESS WHEREOF, the parties have executed this Agreement as of the date and
year first above written. 

                            OSI PHARMACEUTICALS, INC.


                            By: /s/ Gary E. Frashier    Date: June 29, 1998
                               ------------------------     -----------------
                               Gary E. Frashier
                               Chairman and Chief Executive Officer


                               /s/ Colin Goddard, Ph.D.  Date: June 29, 1998
                               ------------------------     -----------------
                               Colin Goddard, Ph.D.


                                       14

<PAGE>   1
         Portions of this Exhibit 10.2 have been redacted and are the subject of
a confidential treatment request filed with the Secretary of the Securities and
Exchange Commission.
<PAGE>   2
                     AMENDATORY AND COLLABORATIVE AGREEMENT


         Amendatory and Collaborative Agreement (this "Agreement") dated as of
March 31, 1998, between OSI Pharmaceuticals, Inc. (formerly named Oncogene
Science, Inc.), a Delaware corporation having its principal place of business at
106 Charles Lindbergh Boulevard, Uniondale, New York 11553 ("OSI"), and
Sepracor, Inc., a Delaware corporation having its principal place of business at
111 Locke Drive, Marlborough, Massachusetts ("Sepracor").

         WHEREAS Sepracor and OSI are parties to a collaborative research,
development and commercialization agreement (the "Joint Venture Agreement")
dated as of March 7, 1997 which is attached hereto as Exhibit A; and

         WHEREAS, Sepracor and OSI intend by this Agreement to change the
relationship between them provided for in the Joint Venture Agreement and to
terminate many of the provisions of the Joint Venture Agreement; and

         WHEREAS, commencing as of April 1, 1998, (the "Amendatory Effective
Date") the new arrangement between OSI and Sepracor will be effective.

         NOW, THEREFORE, the Parties agree as follows:

                                    ARTICLE 1
                          INTERPRETATION AND AMENDMENTS

         1.1      DEFINED TERMS. In this Agreement, unless the context or 
subject matter is inconsistent therewith, the following terms and expressions
shall have the following meanings:
<PAGE>   3
                  (a)      "Affiliate" shall mean, with respect to any Person
(including a Party), any other Person which directly or indirectly controls or
is controlled by, or is under direct or indirect common control with, such first
mentioned Person or any Person which is directly or indirectly controlled by a
Person which controls the first mentioned Person; for the purpose of this
definition, "control" shall mean, with respect to any Person (including any
Party), the ownership of more than 50% of the voting shares or other voting
equity of that Person. This definition notwithstanding, neither Versicor nor
BioSepra shall be considered to be affiliates of Sepracor for the purposes of
this Agreement.

                  (b)      "Agreement" shall mean this Amendatory and
Collaborative Agreement and all instruments supplemental hereto or in amendment
or in confirmation hereof; "herein", "hereof", "hereto", "hereunder" and similar
expressions mean and refer to this Agreement and not to any particular article,
section, subsection or other subdivision; "article", "section", "subsection" or
other subdivision of this Agreement shall mean and refers to the specific
article, section, subsection or other said subdivision of this Agreement.

                  (c)      "Amendatory Effective Date" shall mean April 1, 1998.

                  (d)      "Confidential Information" shall mean Sepracor
Confidential Information or OSI Confidential Information, as the case may be.

                  (e)      "FDA" shall mean the United States Food and Drug
Administration.


                                      -2-
<PAGE>   4
                  (f)      "Field" shall mean research, development, marketing,
distribution, and sale of ** including, without limitation, ** which were
designated by the Joint Steering Committee under the Joint Venture Agreement and
research, development, marketing, distribution, and sale of ** also as
designated by the Joint Steering Committee under the Joint Venture Agreement.

                  (g)      "Independent Third Party" shall mean any Person other
than Sepracor, OSI and/or any of their respective Affiliates.

                  (h)      "Joint Development Committee" shall mean the
development committee established under Section 2.5.1 of the Joint Venture
Agreement.

                  (i)      "Joint Steering Committee" or "JSC" shall mean the
steering committee established under Section 2.4.1 of the Joint Venture
Agreement.

                  (j)      "Joint Technology" shall mean and include all
technology and information, including all inventions, chemical structures and
methods for synthesis, structure-activity relationships, assay methodology,
methods, processes, formulae, plans, specifications, characteristics, equipment
and equipment designs, know how, trade secrets, discoveries, formulations and
biological, toxicological and clinical data, that were conceived jointly by
employees or agents of, or consultants to, Sepracor and OSI, or licensed in the
Field jointly by the Parties or on behalf of the Parties during the term of the
Joint Venture Agreement, such that Sepracor and OSI each own an undivided
interest therein. 

- ---------------

**       This portion has been redacted pursuant to a request for confidential
         treatment.


                                      -3-
<PAGE>   5
                  (k)      "NDA" means a new drug application filed with the FDA
with respect to a Product.

                  (l)      "OSI Confidential Information" shall mean all
confidential information disclosed to Sepracor orally and subsequently confirmed
in writing as "confidential" or designated as "confidential" by OSI or its
Affiliates at the time of disclosure to Sepracor, to the extent that such
information as of the date of disclosure to Sepracor is not (i) demonstrably
known to Sepracor other than by virtue of a prior confidential disclosure to
Sepracor by OSI or its Affiliates, or (ii) disclosed in the published literature
or otherwise to the public through no fault of Sepracor, its Affiliates,
employees or consultants, or (iii) obtained from an Independent Third Party
having no obligation of confidentiality to OSI or its Affiliates with respect to
such information.
                
                  (m)      "OSI Technology" shall mean and include all
technology and technical information relating to a Compound, including all
inventions, chemical structures and methods for synthesis, structure-activity
relationships, assay methodology, methods, processes, formulae, plans,
specifications, characteristics, equipment and equipment designs, know how,
trade secrets, discoveries, results, formulations and biological, toxicological
and clinical data and physical, chemical or biological material, that is
conceived solely by employees or agents of, or consultants to, OSI and/or its
Affiliates, prior to or during the term of the Joint Venture Agreement or
acquired by purchase, license, assignment or other means from third parties
prior to or during the term of the Joint Venture Agreement that is not Joint
Technology, but only to the 


                                      -4-
<PAGE>   6
extent that OSI or its Affiliates is legally entitled to disclose such
Technology and technical information and use it in connection with the
performance by it of its obligations hereunder.

                  (n)      "Patent Rights" shall mean all patents and patent
applications, including any divisional, continuation, continuation-in-part,
reissue, renewal or extension thereof, or substitute therefor, any registration
or confirmation thereof, relating to any Technology, Compounds or Products,
their methods of manufacture or uses of intermediates therefor, or formulations
thereof. "OSI Patent Rights" shall mean Patent Rights claiming inventions that
are conceived solely by employees or consultants of OSI or its Affiliates.
"Joint Patent Rights" shall mean Patent Rights claiming inventions that are
conceived jointly by employees, agents, or consultants of OSI and employees or
consultants of Sepracor and of their respective Affiliates. "Sepracor Patent
Rights" shall mean Patent Rights claiming inventions that are conceived solely
by employees, agents, or consultants of Sepracor or its Affiliates.

                  (o)      "Person" shall mean any individual, corporation,
company, cooperative, partnership, trust, unincorporated association or any
other entity which possesses a juridical personality, including any governmental
authorities or body of competent jurisdiction; and pronouns when referring to a
Person, shall have a similar extended meaning.

                  (p)      "Products" shall have the meaning set forth in
Section 4.1 hereof.

                  (q)      "Research Program" shall mean the written research
plan annexed to the Joint Venture Agreement as Schedule A, as subsequently
revised or replaced by the Joint Steering Committee, which plan described the
research and other obligations to be carried out by each of Sepracor and OSI and
their Affiliates.

                                      -5-
<PAGE>   7
                  (r)      "Sepracor Compounds" shall mean any Compounds
contributed under the Joint Venture Agreement by Sepracor and any analogs
thereof which fall into the following chemical classes: ** .

                  (s)      "Sepracor Technology" shall mean and include all
technology and technical information relating to a Compound, including all
inventions, chemical structures and methods for synthesis, structure activity
relationships, assay methodology, methods, processes, formulae, plans,
specifications, characteristics, equipment and equipment designs, know how,
trade secrets, discoveries, results, formulations and biological, toxicological
and clinical data and physical, chemical or biological material, that is
conceived solely by employees or agents of, or consultants to, Sepracor and/or
its Affiliates, prior to or during the term of the Joint Venture Agreement or
acquired by purchase, license, assignment or other means from third parties
prior to or during the term of the Joint Venture Agreement that is not Joint
Technology, but only to the extent that Sepracor or its Affiliates is legally
entitled to disclose such Technology and technical information and use it in
connection with the performance by it of its obligations hereunder.

                  (t)      Any capitalized terms used but not defined herein
shall have the same meanings as in the Joint Venture Agreement.

         1.2      TERMINATION OF RESEARCH PROGRAM. On the Amendatory Effective
Date, the Research Program, and the functions of the Joint Steering Committee
and the Joint Development Committee shall cease and neither OSI nor its
Affiliates nor Sepracor nor its Affiliates shall have 

- ---------------

**       This portion has been redacted pursuant to a request for confidential
         treatment.


                                      -6-
<PAGE>   8
any further obligations thereunder except as provided in this Agreement. Each
Party confirms that the other Party and its Affiliates shall, on and after the
Amendatory Effective Date, be free to conduct research activities within the
Field including but not limited to activities involving ** ; provided however,
that Sepracor and its Affiliates shall be responsible at their sole expense and
discretion for the development of existing pre-clinical candidates arising under
the Joint Venture Agreement and analogs thereof versus ** (subject to obtaining
OSI's assistance on the fee for service basis as hereinafter provided for) and
that Sepracor shall have the royalty obligations to OSI with respect thereto as
hereinafter provided for.

         1.3      SETTLEMENT OF EXPENSES. The Parties acknowledge that, as of
the Amendatory Effective Date, they have settled any expense obligations
contemplated to be reimbursed by Section 3.1 of the Joint Venture Agreement and
that Section 3.1 of the Joint Venture Agreement shall be of no further force and
effect.

         1.4      SECRET INFORMATION. Sections 4.1, 4.2 and 4.3 of the Joint
Venture Agreement shall remain in full force and effect. Section 4.4 of the
Joint Venture Agreement shall be of no further force or effect after the
Amendatory Effective Date.

         1.5      INTELLECTUAL PROPERTY. Sections 5.1 and 5.2 of the Joint
Venture Agreement shall remain in full force and effect, subject to the royalty
obligations set forth hereinafter in this Agreement. All rights to the Sepracor
Compounds shall, as between OSI and Sepracor, be solely owned by Sepracor and
hereafter shall be further developed by Sepracor at its sole expense and

- ---------------

**       This portion has been redacted pursuant to a request for confidential
         treatment.


                                      -7-
<PAGE>   9
discretion. Accordingly, after the Amendatory Effective Date OSI shall not be
bound by Section 5.3 or Section 5.4 of the Joint Venture Agreement, nor shall
the Parties have the obligations to each other contemplated by 5.5, 5.6, 5.7,
5.8 or 5.9 of the Joint Venture Agreement. Sepracor shall be responsible for all
costs associated with or arising out of the patenting of the pre-clinical
candidates identified under the Joint Venture Agreement and Sepracor's patent
maintenance and indemnification obligations in connection therewith. Section
5.10 shall remain in full force and effect. Nothing herein shall be deemed to
confer upon Sepracor any rights in or to OSI Technology or OSI Patents.

         1.6      DEVELOPMENT AND COMMERCIALIZATION. Article 6 and Article 7 of
the Joint Venture Agreement shall be of no further force or effect after the
Amendatory Effective Date.

         1.7      TERMINATION. Except as otherwise provided herein, the Joint
Venture Agreement (including the Initial Term) shall terminate on March 31, 1998
and neither Party shall have any rights of renewal or other rights thereunder
except as provided in this Agreement. Accordingly, after the Amendatory
Effective Date, Article 8 and Section 9.2 of the Joint Venture Agreement shall
be of no further force or effect.

         1.8      CONFIDENTIAL INFORMATION. The obligations of the Parties with
respect to Confidential Information set forth in Section 9.3 of the Joint
Venture Agreement shall remain in full force and effect after the Amendatory
Effective Date.

         1.9      REPRESENTATIONS AND WARRANTIES. The representations and
warranties of Sepracor and OSI set forth in Article 10 are reaffirmed with
respect to this Agreement (but not the Research Program being terminated hereby)
as if fully set forth herein.

                                      -8-
<PAGE>   10
         1.10     AFFIRMATIVE COVENANTS. Throughout the term of this Agreement,
each of Sepracor and OSI shall comply in all material respects with the
requirements of all applicable laws, rules, regulations and orders of any
government authority to the extent necessary to carry out its obligations under
this Agreement.

         1.11     DISPUTE RESOLUTION; MISCELLANEOUS. After the Amendatory
Effective Date, Articles 12, 13 and 14 of the Joint Venture Agreement shall be
of no further force or effect.

                                    ARTICLE 2

                        RESPONSIBILITIES WITH RESPECT TO
                   SEPRACOR COMPOUNDS IN THE RESEARCH PROGRAM

         2.1      Any Sepracor Compounds demonstrated in the Research Program to
show efficacy during the Joint Venture Agreement shall be owned (as between OSI
and Sepracor) by Sepracor and Sepracor shall be responsible for all further
development at its sole expense and discretion. Accordingly, Sepracor will have
full responsibility for all further developments of pre-clinical candidates
versus ** . Each Party shall have full rights and shall be free to independently
pursue the discovery of new compounds ** without incurring any responsibility to
the other Party thereby, provided that the resultant new compounds are not
direct structural analogs of the Sepracor Compounds.

- ---------------

**       This portion has been redacted pursuant to a request for confidential
         treatment.


                                      -9-
<PAGE>   11
                                    ARTICLE 3

                            FEE FOR SERVICES SUPPORT


         3.1      OSI shall provide to Sepracor discovery biology and ADME
support on a fee for services basis to Sepracor as hereinafter provided.

         3.2      For a six-month period commencing on the Amendatory Effective
Date, Sepracor shall provide funding to OSI in an amount equal to the equivalent
of ** full time employees at the rate of ** per employee per year, for a total
cost of ** for such six-month period. Such funding shall be split between
microbiology support for OSI's North Carolina facility and ADME and PK support
for OSI's Aston facility according to needs as directed by Dr. ** , or his
nominee, and as administered at OSI by Dr. ** or his nominee. Thereafter, as
mutually agreed, Sepracor will commit to a support level on a quarterly basis
six weeks prior to the beginning of any given quarter.

         3.3      The Parties acknowledge that the costs referred to above in
this Article 3 do not include the costs of sub-contracting certain aspects of
the animal work. Up to $100,000 of such costs will be reimbursed by Sepracor.
Any such cost shall be subject to prior approval by Sepracor and shall be
charged by OSI at cost.

         3.4      If the Parties have not agreed to an alternative arrangement
or to an extension of the arrangements described in this Article 3 on or before
September 1, 1998, the fee for service arrangements hereinabove provided for
shall terminate on September 1, 1998. 

- ---------------

**       This portion has been redacted pursuant to a request for confidential 
         treatment.


                                      -10-
<PAGE>   12
                                    ARTICLE 4

                                    ROYALTIES

         4.1      If Sepracor or its Affiliates (other than a collaborative
partner or sublicensee which collaborative or sublicense arrangement is
hereinafter separately provided for) markets a product labeled for use in the
Field and containing a Sepracor Compound (a "Product"), Sepracor shall pay to
OSI royalties equal to the greater of (a) ** and (b) ** of the Net Sales of the
Product. ** All costs will be determined in conformity with generally accepted
accounting principles.

         4.2      If Sepracor enters into a collaborative or sublicense
arrangement with a Third Party with respect to a Product prior to the marketing
of such Product, OSI shall receive the following percentages of any revenue
(including royalties and milestones, success fees and similar items) received by
Sepracor and/or its Affiliates with respect to the Product; provided, however,
that with regard to any royalties received by Sepracor and/or its Affiliates, in
no event shall the amounts received by OSI be less than ** of the net sales of
such Product as "net sales" is defined in the relevant third party agreement:

                  (a)      If partnered prior to completion of FDA Phase I
clinical trials: ** ;

                  (b)      If partnered after completion of Phase I clinical
trials but prior to the completion of FDA Phase II clinical trials: ** ;

- ---------------

**       This portion has been redacted pursuant to a request for confidential 
         treatment.


                                      -11-
<PAGE>   13
                  (c)      If partnered after completion of Phase II clinical
trials but prior to the completion of FDA Phase III clinical trials: ** ;

                  (d)      If partnered after completion of Phase III clinical
trials: ** . 

Any non-cash consideration received by Sepracor and/or its Affiliates will be
valued at fair market value by the Parties in good faith at the time of receipt
and the Parties shall negotiate in good faith a split of such non-cash
consideration.

         4.3      "Net Sales" shall mean the gross revenues received from the
first sale of a Product by a Party, and/or its Affiliates to an independent
third party, less deductions for:

                  (a)      standard transportation charges, including insurance,
consistent with custom in the industry;

                  (b)      import, export, sales, use and excise taxes, tariffs
and duties paid or allowed by a selling party and any other governmental charges
imposed upon the production, importation, use or sale of a Product;

                  (c)      quantity discounts (including volume or formulary or
other positioning discounts paid or credited to any wholesaler, purchaser or
third party payor or other contractee as a result of a contractual arrangement
specific to a Product), cash discounts (including discounts for prompt payment),
customary trade promotional allowances and credits, in the ordinary course of
business, and rebates and charge backs as contractually committed;

- ---------------

**       This portion has been redacted pursuant to a request for confidential 
         treatment.



                                      -12-
<PAGE>   14
                  (d)      discounts (including retroactive price reductions or
a statutorily required reimbursement) mandated by or granted in response to
state, provincial or federal law or regulation; and

                  (e)      allowances or credits to customers on account of
recalls, rejection or return (including for spoiled, damaged and outdated goods)
in the ordinary course of business.

         4.4      Royalties shall be paid by Sepracor on Net Sales within 60
days after the end of each calendar quarter in which such Net Sales are made.
Such payments shall be accompanied by a statement showing the Net Sales of each
Product in each country and a calculation of the amount of royalty due. The
amount shall be paid net of any withholding or other taxes required.

         4.5      The Net Sales used for computing the royalties payable to OSI
by Sepracor shall be computed, and the royalties shall be paid, in U.S. Dollars.
For purposes of determining the amount of royalties due with respect to Net
Sales in any foreign currency, the amount shall be computed generally by
converting the foreign currency amount into U.S. Dollars using for each month's
calculation the average of the foreign currency exchange rates during the
preceding month reported in the National Edition of the Wall Street Journal.

         4.6      Sepracor shall keep for two years from the date of each
payment of royalties complete and accurate records of Net Sales of each Product
by it and its Affiliates in sufficient detail to allow the accruing royalties to
be determined accurately. Sepracor shall make its records available for
inspection by OSI's independent certified public accountant during regular
business hours at such place or places where such records are customarily kept,
upon reasonable notice from OSI, to the extent reasonably necessary to verify
the accuracy of the reports and 


                                      -13-
<PAGE>   15
payments and at the expense of OSI unless any such investigation or audit
reveals an underpayment of royalties of 5% or more, in which case the expense of
such investigation or audit shall be borne by Sepracor. Such inspection right
shall not be exercised more than once in any calendar year nor more than once
with respect to sales in any given period. Such independent certified public
accountant shall report to OSI only as to the accuracy of the Net Sales
computation and royalty payments. OSI agrees to hold in strict confidence all
information concerning royalty payments and reports, and all information learned
in the course of any audit or inspection, except to the extent necessary for OSI
to reveal such information in order to enforce its rights under this Agreement
or disclosure is required by law. The failure of OSI to request verification of
any report or statement during the two year period shall be considered
acceptance of the accuracy of such report, and Sepracor shall have no obligation
to maintain records pertaining to such report or statement beyond the two year
period. The results of the inspection shall be reviewed with and verified by
Sepracor's independent auditors and any disputes with regard thereto shall be
resolved by a third, independent accounting firm mutually chosen by the parties,
whose fees shall be split equally between the parties and whose results shall be
binding.

         4.7      All amounts owing to OSI as specified in this Agreement shall
be paid net of all applicable taxes, fees, and other charges excluding only
taxes on the income of Sepracor. The Parties will cooperate with each other in
minimizing the withholding tax applicable to any payment made by Sepracor
hereunder and in claiming tax refunds. Upon refund of such taxes, if by
Sepracor, these funds will be forwarded to OSI within sixty days.

                                      -14-
<PAGE>   16
         4.8      If Sepracor receives compensation from sales of Products which
includes lump sum payments or payments in a manner other than one for which
royalties based on Net Sales would be the appropriate measure (other than
through a collaborative arrangement which is hereinabove provided) such as
compensation through a co-marketing arrangement, the Parties will negotiate in
good faith an appropriate compensation arrangement by which OSI will be
remunerated for its contributions.

         4.9      PROTECTION OF RIGHTS.

                  (a)      Each Party shall promptly notify the other Party in
writing of any alleged or threatened infringement of Patent Rights or of any
alleged or threatened unlawful disclosure of Confidential Information of which
it becomes aware. Sepracor shall have the right but not the obligation to bring,
at its own expense and in its sole control, an appropriate action against any
person or entity infringing Patent Rights or making unlawful disclosure of
Confidential Information. Sepracor shall notify OSI promptly of the commencement
of any such suit, action or proceeding. If Sepracor determines that it is
necessary or desirable for OSI to join any such suit, action, or proceeding, OSI
shall execute all papers and perform such other acts as may be reasonably
required to permit Sepracor to act in OSI's name. In the event that Sepracor
brings a suit, it shall have the right first to reimburse itself out of any sums
recovered in such suit or in its settlement for all reasonable costs and
expenses involved in the prosecution of any suit. If Sepracor lacks standing to
bring any such suit, action, or proceeding, then OSI shall do so at the request
of Sepracor and at Sepracor's expense and control.

                                      -15-
<PAGE>   17
                  (b)      With respect to OSI and Patent Rights, and Joint
Patent Rights, if within 120 days after notice has been given pursuant to
Section 4.10, Sepracor does not notify OSI of Sepracor's intent to bring suit
against any infringer, OSI shall have the right to bring suit for such alleged
infringement, but it shall not be obligated to do so, and may cause Sepracor to
be joined as a party plaintiff, if appropriate, in which event OSI shall hold
Sepracor free, clear, and harmless from any and all costs and expenses of such
litigation, including attorney's fees, and any sums recovered in any such suit
or in its settlement shall belong to OSI. Each Party shall always have the right
to be represented by counsel of its own selection and at its own expense in any
suit instituted by the other for infringement, under the terms of this
paragraph, and shall fully cooperate with the other in prosecuting the action.

                  (c)      If Sepracor obtains a license under a third party
patent that in Sepracor's judgment would be infringed by manufacturer, use or
sale of the product, then ** percent ** of any payments made by Sepracor to such
third party shall be deductible from royalty payments due from Sepracor to OSI;
provided, however, that in no event shall royalties payable to OSI be reduced **
as a result of all such deductions. All such computations, payments, and
adjustments shall be on a country by country and patent by patent basis.


- ---------------
**       This portion has been redacted pursuant to a request for confidential 
         treatment.


                                      -16-
<PAGE>   18
                                    ARTICLE 5
                                     NOTICES

         All notices shall be faxed, or mailed via certified mail, return
receipt requested, or courier addressed as follows, or to such other address as
may be designated from time to time: 


             If to OSI:        At its address as set forth at the beginning of
                               this Agreement

                               Attn.:   Colin Goddard, Ph.D.
                               Fax :    516-745-6429

             If to Sepracor:   At its address as set forth at the beginning of
                               this Agreement

                               Attn.:   Chief Executive Officer
                               Fax :    508-460-8118


         Notices shall be deemed given as of the date of receipt.



                                      -17-
<PAGE>   19
                                    ARTICLE 6
                                  MISCELLANEOUS

         6.1      BINDING EFFECT. This Agreement shall be binding upon and inure
to the benefit of the Parties hereto and their respective legal representatives,
successors and permitted assigns.

         6.2      HEADINGS. The headings contained in this Agreement are for
convenience of reference only and do not form a part of this Agreement, and no
construction or inference shall be derived therefrom.

         6.3      ENTIRE AGREEMENT . This Agreement and the documents and other
agreements referred to herein or signed concurrently herewith set forth the
entire agreement and understanding of the Parties.

         6.4      SEVERABILITY. In the event that any provision of this
Agreement is held by a court of competent jurisdiction to be unenforceable
because it is invalid or in conflict with any law of any relevant jurisdiction,
the validity of the remaining provisions shall be construed and enforced as if
the Agreement did not contain the particular provisions held to be
unenforceable.

         6.5      COUNTERPARTS. This Agreement may be executed simultaneously in
two or more counterparts, each of which shall be deemed an original, but all of
which together shall constitute one and the same instrument.

         6.6      AMENDMENT. WAIVER, ETC. This Agreement may be amended,
modified, superseded or canceled, and any of the terms hereof may be waived,
only by a written instrument executed by each Party hereto or, in the case of
waiver, by the Party or Parties waiving compliance. The delay or failure of any
Party at any time or times to require performance of any 


                                      -18-
<PAGE>   20
provision hereof shall in no manner affect the rights at a later time to enforce
the same. No waiver by any Party of any condition or of the breach of any term
contained in this Agreement, whether by conduct or otherwise, in any one or more
instance, shall be deemed to be, or construed as, a further or continuing waiver
of any such condition or of the breach of such term or any other term of this
Agreement.

         6.7      ASSIGNMENT AND SUCCESSORS. This Agreement and the rights and
interests hereunder may not be assigned by either Party in whole or in part
except to an Affiliate, a purchaser of all or substantially all of the assets of
a Party or to any successor corporation resulting from any merger or
consolidation of either Party with or into such corporation.

         6.8      GOVERNING LAW. This Agreement shall be construed and
interpreted in accordance with the laws of the State of New York.

         IN WITNESS WHEREOF, the Parties hereto have caused this Agreement to be
executed as a sealed instrument in their names by their properly and duly
authorized representatives as of the date first written above.

                                          SEPRACOR, INC.



                                          By:  /s/ Timothy J.
                                              -----------------------------
                                          Name:    Timothy J. Barberich
                                          Title:   President and CEO


                                          OSI PHARMACEUTICALS, INC.



                                          By:   /s/ Colin Goddard
                                               ----------------------------
                                          Name:    Colin Goddard
                                          Title:   President


                                      -19-
<PAGE>   21
                                    EXHIBIT A

                     Collaborative Research, Development and
                           Commercialization Agreement
                            dated as of March 7, 1997


          [PREVIOUSLY FILED WITH THE SECURITIES AND EXCHANGE COMMISSION
            ON MAY 15, 1997 WITH THE FORM 10-Q FOR THE QUARTER ENDED
                  MARCH 31, 1997 OF OSI PHARMACEUTICALS, INC.]


                                      -20-


<PAGE>   1
         Portions of this Exhibit 10.3 have been redacted and are the subject of
a confidential treatment request filed with the Secretary of the Securities and
Exchange Commission.
<PAGE>   2
                  RESEARCH COLLABORATION AND LICENSE AGREEMENT


                  This RESEARCH COLLABORATION AND LICENSE AGREEMENT, dated as of
April 1st 1998, is entered by and between FUJIREBIO, INC., a company duly
organized and existing under the laws of Japan with its principal place of
business at 2-62-5, Nihonbashi, Hamacho, Chuo-ku, Tokyo 103, Japan ("FRI"), and
ONCOGENE SCIENCE DIAGNOSTICS, INC., a company duly organized and existing under
the laws of Delaware with its principal place of business at 80 Rogers Street,
Cambridge, Massachusetts 02142 ("OSD") and OSI PHARMACEUTICALS INC., a company
duly organized and existing under the laws of Delaware with its principal place
of business at 106 Charles Lindbergh Boulevard, Uniondale, NY 11553-3649
("OSIP", together with OSD, collectively "OSI".)

                  WHEREAS, OSI was organized to develop, produce and market
diagnostic products for, among other things, the early detection, monitoring and
treatment of human disease, particularly cancer;

                  WHEREAS, OSD is a wholly owned subsidiary (and a former
division) of OSIP engaged principally in the development of novel cancer
diagnostic assays;

                  WHEREAS, FRI has the capability to develop, format,
manufacture, attain regulatory approvals for, market and distribute diagnostic
products and instrumentation systems in Japan;

                  WHEREAS, FRI desires to commercialize certain of OSI's
proprietary cancer assays for use in connection with the Clinical Diagnostic
Product (as defined herein) for sales and marketing in Japan;

                  WHEREAS, FRI wishes to provide funding in support of OSI's
research and further development of certain proprietary cancer assays; and

                  WHEREAS, OSI and FRI understand that, pursuant to OSI's
research and development agreement with Bayer Corporation ("Bayer"), OSI shall
collaborate with Bayer in the research and further development of such
proprietary cancer assays.

                  NOW, THEREFORE, in consideration of the premises and promises
contained herein, the parties agree as follows:

1.       Definitions

         Whenever used in this Agreement, the terms defined in this Section 1
shall have the meanings specified.

         1.1.     "Affiliates" of a party means any corporation, partnership or
                  other entity directly or indirectly owned by, owning, or under
                  common ownership with such party of 
<PAGE>   3
                  at least fifty percent (50%) of its stock and having the power
                  to vote for the election of directors, such corporation,
                  partnership or other entity to be deemed an Affiliate only so
                  long as such ownership of voting stock continues.

         1.2.     "Clinical Diagnostic Product" means any version, successor or
                  application of FRI's Lumipulse system now in existence or
                  hereafter devised, which is sold to medical centers, reference
                  laboratories, cancer centers, clinicians, pathologists,
                  oncologists and others that typically utilize diagnostic kits
                  and automated systems to provide clinical information to
                  assist in the diagnosis, prognosis, monitoring or screening of
                  cancer or potential cancer patients.

         1.3.     "FRI Technology" means all Technology that was:

                  (a)      developed by employees of, or consultants to, FRI
                           alone or jointly with Third Persons on or prior to
                           the Effective Date.

                  (b)      acquired by purchase, license, assignment or other
                           means from Third Persons by FRI on or prior to the
                           Effective Date.

                  FRI Technology shall be owned by FRI.

         1.4.     "Licensed Product" means any Clinical Diagnostic Product that
                  incorporates the Proprietary Assays and/or that employs OSI
                  Technology in its manufacture, use or sale.

         1.5.     "Net Sales" means the gross amount received by FRI for arm's
                  lengths sales to a Third Person of Licensed Products,
                  respectively, after deducting, where applicable the following:

                  (a)      normal and customary trade discounts actually allowed
                           and taken;

                  (b)      returns and credits;

                  (c)      taxes (the legal incidence of which is on the
                           purchaser and separately shown on the shipping
                           invoice); and,

                  (d)      transportation, insurance and postage charges (if
                           prepaid and invoiced as a separate item).

         1.6.     "OSI Patent Rights" means all Patent Rights comprised in OSI
                  Technology. OSI Patent Rights shall be owned by OSI subject to
                  the rights granted to FRI under this Agreement and shall
                  include the ones attached hereto as Exhibit C.

         1.7.     "OSI Product" means ELISA kits for certain cancer markers
                  developed and manufactured by OSI and listed in Exhibit B.

                                      -2-
<PAGE>   4
         1.8.     "OSI Technology" means all Technology relating to the
                  Proprietary Assays used in connection with the development of
                  a Clinical Diagnostic Product that was:

                  (a)      developed by employees of, or consultants to, OSI
                           alone or jointly with third persons (including Bayer)
                           on or prior to the Effective Date, which OSI
                           determines in its discretion to contribute to the
                           research program as outlined in the OSI/FRI Annual
                           Operating Plan; or

                  (b)      acquired by purchase, license, assignment or other
                           means from third persons (including Bayer) by OSI on
                           or prior to the Effective Date, which OSI determines
                           in its discretion to contribute to the research
                           program; or,

                  (c)      developed by employees of, or consultants to, OSI
                           alone or jointly with third persons (including Bayer)
                           on or after the Effective Date pursuant to, or in
                           connection with, the OSI/FRI Annual Operating Plan

                           OSI Technology shall be owned by OSI subject to the
                           rights granted to FRI under this Agreement.

         1.9.     "OSI/FRI Annual Operating Plan" means the written plan
                  describing the research to be carried out on the Proprietary
                  Assays for each Research Year excluding FRI's activity on the
                  development of Licensed Products.

         1.10.    "Patent Rights" means all patentable inventions, including all
                  applications for patents, whether domestic or foreign,
                  disclosing or claiming such inventions, all continuations,
                  continuations-in-part, divisions, renewals and patents of
                  addition thereof, all patents granted thereon, whether
                  domestic or foreign, and all reissued or reexamined patents
                  based thereon.

         1.11.    "Proprietary Assays" mean the nine (9) proprietary cancer
                  assays owned by OSI set forth in Exhibit A and
                  attached hereto.

         1.12.    "Research Year" means each twelve (12) month period outlined
                  in Exhibit A attached hereto.

         1.13.    "Technology" means Patent Rights and all know-how, trade
                  secrets and confidential technical information and material,
                  including, without limitation, all laboratory notebooks,
                  research plans, inventions, genes and gene fragments and other
                  sequences, cell lines, hybridomas, monoclonal and polyclonal
                  antibodies, proteins and protein fragments, assay methodology,
                  processes, materials and methods for production, formulae,
                  plans, specifications, characteristics, marketing surveys and
                  plans and business plans.

                                      -3-
<PAGE>   5
         1.14.    "Third Person" means a person other than OSI or FRI, or other
                  than any employee of, or consultant to OSI or FRI.

         1.15.    "Materials" mean antibodies, antigens, and other substances
                  relating to Proprietary Assays, which are in use of FRI for
                  the development and manufacturing of Licensed Products.

2.       Licenses.

         2.1.     License granted to FRI. During the term of this Agreement and
                  subject to the terms and conditions herein appearing, OSI
                  hereby grants to FRI a non-exclusive right and license under
                  the OSI Patents Rights and the OSI Technology to develop,
                  manufacture, and sell Licensed Products in Japan. FRI shall
                  use its best efforts to commercialize the Proprietary Assays
                  set forth in the OSI/FRI Annual Operating Plan and should FRI
                  fail to commercialize any such Proprietary Assay within the
                  five (5) years immediately following the effective date of the
                  OSI/FRI Annual Operating Plan in which such Proprietary Assay
                  appears, FRI shall forfeit to OSI all rights in and to such
                  Proprietary Assay licensed in this Section;

         2.2.     Up-front Payment. In consideration of the right granted
                  pursuant to Section 2.1 above, FRI shall pay to OSI a
                  non-refundable sum of ** on a date not later than fifteen (15)
                  days prior to June 15 in each applicable Research Year,
                  provided that the first such payment shall be paid on or
                  before May 30, 1998.

         2.3.     Royalties. FRI shall pay to OSI a royalty of ** percent ** of
                  Net Sales of any Licensed Product hereunder from the first
                  sale of a Licensed Product until the event with the later to
                  occur of (i) the date ten (10) years after the date of such
                  first sale or (ii) the expiration of the last to expire of any
                  OSI Patent Rights underlying any Licensed Product sold by FRI
                  hereunder.

         2.4.     Payment Dates. Within sixty (60) days following the close of
                  each calendar quarter (or any part in the first or last
                  calendar quarter) of this Agreement, FRI shall deliver to OSI
                  a true and accurate report, stating for each Licensed Product,
                  for said calendar quarter (a) Net Sales, (b) the royalties
                  payable thereon, and (c) the amount of any credit taken
                  against royalties payable pursuant hereto. Except as otherwise
                  provided, simultaneously with the delivery of each report, FRI
                  shall pay to OSI the amount, if any, due for the period of
                  such report.

- ------------------

**       This portion has been redacted pursuant to a request for confidential 
         treatment.


                                      -4-
<PAGE>   6
         2.5.     Accounting. All amounts payable hereunder shall be payable in
                  US Dollars (to OSD or OSIP as designated by notice to FRI);
                  provided, however, that if any payment of Net sales by FRI or
                  its Affiliates is received in Japanese yen, such amount shall
                  be converted into US dollars at the bank selling rate for
                  Japanese yen into US dollars on the last day of quarterly
                  reporting period (as outlined in Section 2.4), quoted by
                  authorized foreign exchange bank in Tokyo.

         2.6.     Records. During term of this Agreement, FRI shall keep
                  complete and accurate records of Net Sales in sufficient
                  detail to enable OSI to determine payments owed to it under
                  this Agreement for a period of three (3) years after such
                  payments are due. FRI shall permit an independent certified
                  public account, acceptable to FRI (a list of independent
                  public accountants selected by OSI and acceptable to FRI is
                  attached as Exhibit E hereto) and appointed by OSI and at
                  OSI's expense, to examine its books, ledgers and records
                  covering Net Sales during regular business hours for the
                  purpose of verifying, and only to the extent necessary to
                  verify, the amount of royalties due and payable but in no
                  event more than once per calendar year. The accountant shall
                  maintain all information received during such examination in
                  confidence, and shall report to OSI only with respect to the
                  accuracy of any report. Any report not examined within three
                  (3) years of its having been made shall be deemed true and
                  accurate. In the event the records examined reveal that FRI
                  has paid less than ninety-five percent (95%) of the amount due
                  to OSI, FRI shall pay the costs of the audit and shall pay the
                  additional amount due plus accrued interest at the rate of ten
                  percent (10%) per annum.

         2.7.     Tax. In the event that withholding taxes or other similar
                  taxes be levied by any taxing authority in connection with
                  accrual or payment to OSI pursuant to this Article 2, FRI
                  shall pay such taxes to the local authorities on behalf of
                  OSI, and the payment to OSI of the net amount due after
                  reduction by the amount of such taxes shall fully satisfy OSI'
                  obligations under this Agreement.

         2.8.     Option. OSI hereby agrees to negotiate with FRI or its
                  Affiliates in respect of a non-exclusive right to market and
                  commercialize OSI Products in Japan without additional upfront
                  payments. The term for the marketing agreement shall be
                  negotiated and agreed separately between parties.

         2.9.     Patentable Technology. In the event that FRI develops any
                  patentable Technology based upon OSI Technology for the
                  Proprietary Assays in connection with development of Licensed
                  Products, OSI agrees that FRI has the right to apply for
                  patents in any countries with its own name and at its expense.
                  FRI and OSI further agrees that FRI license a world-wide
                  non-exclusive right for such patents to OSI (with sublicensing
                  right) with the condition of royalty from OSI


                                      -5-
<PAGE>   7
                  and its sublicensees to FRI, at a pre-agree royalty rate equal
                  to ** of net sales or in the event that OSI sublicensees such
                  rights, the lesser of ** and ** of the royalty rate received
                  by OSI from its sublicensee.

         2.10.    Supply of Materials.

                  (a)      For research and development efforts as well as for
                           FRI's commercialization of Proprietary Assays, OSI
                           shall supply the Materials to FRI at OSI's
                           manufacturing cost (including overhead cost directly
                           related to manufacturing, which overhead cost shall
                           include general and administrative charges
                           customarily and consistently applied by OSIP to OSD's
                           manufacturing) plus ** mark-up thereon.

                  (b)      OSI and FRI hereby agree to negotiate and execute in
                           good faith a mutually satisfactory supply agreement
                           of Materials for FRI's manufacturing of Licensed
                           Product based on the above condition. OSI shall
                           represents and warrants to FRI that all of Materials
                           delivered pursuant to this Agreement or supply
                           agreement, shall confirm to the specifications to be
                           agreed in the supply agreement between OSI and FRI in
                           accordance with applicable regulatory requirements.

                  (c)      OSI shall use its commercially reasonable efforts to
                           supply for the Materials to FRI during the term of
                           this Agreement in accordance with the terms of the
                           supply agreement to be negotiated by the parties.

                  (d)      OSI agrees to defend, protect, indemnify, and hold
                           harmless FRI from and against any liability, claim,
                           loss, cost or expense arising from any claim for
                           product liability based on OSI's quality of the
                           Materials to be used in the Licensed Product except
                           to the extent such liability, claim, loss or expense
                           also results from the negligence or willful
                           misconduct of FRI, its employees and agents.

3.       Collaborative Research

         3.1.     Research Projects. FRI and OSI hereby agree, subject to the
                  terms and conditions of this Agreement, to undertake four (4)
                  collaborative research projects stated in Exhibit A attached
                  hereto in respect of the Proprietary Assays for four Research
                  Years as set forth in four (4) OSI/FRI Annual Operating Plans.
                  OSI shall provide technical information related to the
                  Proprietary Assays in accordance with agreed upon objectives
                  set forth in an OSI/FRI Annual Operating Plan.

- ------------------

**       This portion has been redacted pursuant to a request for confidential 
         treatment.


                                      -6-
<PAGE>   8
         3.2.     Research Funding. FRI shall pay to OSI a sum of** (** as last
                  payment) as the research funding fee on a date not later than
                  fifteen (15) days prior to June 15 in each applicable Research
                  Year, provided that the first such payment shall be paid on or
                  before May 30, 1998.

         3.3.     Termination of Research Projects by FRI. FRI may terminate
                  further collaborative research pursuant to the terms hereof
                  only (i) upon not less than twelve (12) months advance written
                  notice provided to OSI on or prior to the first day (June 15)
                  of any applicable Research Year (provided, however, that FRI
                  shall have no such termination right in respect of research to
                  be conducted in the second Research Year), and (ii) upon
                  payment of all sums due pursuant to Section 2.2 and 3.2 hereof
                  in respect of the upcoming Research Year (for example, FRI
                  must (i) provide notice on or before June 15, 1999 and (ii)
                  pay the ** , when due, in respect of the Second Research Year
                  (1999-2000) in order to terminate research to be conducted in
                  the Third Research Year(2000-2001)). In the event that FRI
                  terminate further collaborative research pursuant hereto, the
                  license to commercialize the Proprietary Assays granted to
                  FRI hereunder shall be limited to those assays listed in
                  Exhibit A attached hereto under Research Years in respect of
                  which FRI provided both an up-front fee and research funding
                  under Sections 2.2 and 3.2 hereof. Upon termination of further
                  collaborative research in accordance with the terms of further
                  collaborative research in accordance with the terms of this
                  Section 3.3, FRI shall not be required to make additional or
                  further payments to OSI pursuant to Sections 2.2 and 3.2
                  hereof.

         3.4.     CSI/FRI Annual Operating Plan. The OSI/FRI Annual Operating
                  Plan for the initial Research Year is set forth in Exhibit D
                  attached hereto. For each year after the initial Research
                  Year, the CSI/FRI Annual Operating Plan shall be prepared by
                  the Research Committee no later than ninety (90) days before
                  the end of the prior Research Year and approved by FRI and OSI
                  no later than thirty (30) days before the end of the prior
                  Research Year. The OSI/FRI Annual Operating Plan for each
                  Research Year shall be appended to and made part of this
                  Agreement.

         3.5.     Research Committee.

                  3.5.1.   Purpose.  The Research Committee shall:

                  (a)      Prepare the OSI/FRI Annual Operating Plan for each
                           year;

                  (b)      Review, evaluate progress under and modify the
                           OSI/FRI Annual Operating Plan for each year;
- ------------------

**       This portion has been redacted pursuant to a request for confidential 
         treatment.


                                      -7-
<PAGE>   9
                  (c)      With respect to each Licensed Product prior to
                           commercialization, whether (a) license(s) need(s) to
                           be obtained from a third person(s) in order to make,
                           use or sell such Licensed Product; and,

                  (d)      Determine priority of the Proprietary Assays to be
                           commercialized by FRI.

                  3.5.2.   Membership. FRI and OSI each shall appoint, in its
                           sole discretion, two (2) members to the Research
                           Committee. Substitutes may be appointed at any time
                           upon written notice .

                           The members initially shall be:

                  Appointees:

                  For FRI:                                    For OSI:
                    **                                          **

                  3.5.3.   Chairman. The Research Committee shall be chaired by
                           ** . Should the Chairman of the Research Committee
                           need to be changed for any reason, OSI shall
                           recommend a person with a comparable knowledge and
                           experience in the cancer diagnostic field as the
                           predecessor and shall obtain consent from FRI within
                           30 days before the change is planned to be
                           implemented, which such acceptance shall not be
                           unreasonably withheld.

                 3.5.4.    Meetings. The Research Committee shall meet at least
                           one time per calendar year at mutually agreeable
                           dates and places. Representatives of FRI may visit
                           OSI on an as needed basis to obtain technical help
                           with its commercialization of Proprietary Assays.

                 3.5.5.    Minutes. The Research Committee shall keep accurate
                           minutes which record all proposed decisions and all
                           actions recommended or taken. The minutes shall be
                           delivered to all Research Committee members within
                           ten (10) business days after each meeting. OSI shall
                           be responsible for the preparation of the minutes.

                  3.5.6.   Expenses. FRI and OSI shall each bear all expenses of
                           their respective members related to the participation
                           of the Research Committee.

- ------------------

**       This portion has been redacted pursuant to a request for confidential 
         treatment.



                                      -8-
<PAGE>   10
         3.6.     Reports.

                  OSI shall submit to FRI a report indicating the final results
                  for each of the research projects within thirty (30) days
                  after the end of each Research Year describing in detail the
                  work accomplished by it under the OSI/FRI Annual Operating
                  Plan. OSI further shall submit to FRI summary reports within
                  thirty (30) days after the end of each four-month period,
                  commencing with the period ending 15th of October, 1998,
                  describing its progress under the OSI/FRI Annual Operating
                  Plan.

         3.7.     Laboratory Facilities and Personnel. OSI shall provide
                  suitable laboratory facilities, equipment and personnel for
                  the work to be done in carrying out the OSI/FRI Annual
                  Operating Plan.

         3.8.     Diligent Efforts. FRI and OSI each shall use reasonably
                  diligent efforts to achieve the objectives of the OSI/FRI
                  Annual Operating Plan. Specifically, OSI and FRI shall use
                  diligent efforts to allocate those resources necessary (i.e.,
                  manpower, facilities, equipment) to meet the objectives of the
                  OSI/FRI Annual Operating Plan. FRI shall use its best efforts
                  to commercialize the Proprietary Assays.

         3.9.     Extension. OSI (in advance of the expiration of the last
                  Research Year hereunder) agrees to negotiate in good faith
                  with FRI, on a non-exclusive basis and subject to the prior
                  commitments of OSI, to extend the collaborative research
                  program, upon mutually agreeable terms and conditions, upon
                  nine (9) months' prior written notice from FRI to OSI of FRI's
                  intent to negotiate therefore. The foregoing commitment to
                  negotiate shall terminate sixty (60) days after the date on
                  which FRI provides to CSI of its intent to negotiate pursuant
                  to this Section 3.9.

         3.10.    For avoidance of doubt, OSI and FRI acknowledge and agree that
                  any result, data and technical knowledge resulting from the
                  collaborative research projects shall be included in OSI
                  Technology. If OSI applies for the patent under certain
                  technical knowledge resulting from the research projects in
                  any countries with its own name and at its own expense, OSI
                  agrees to add such patents or patent applications to OSI
                  Patent Rights in this Agreement upon the Research Committee's
                  conclusion .

         3.11.    Further Collaboration. During the period of Research Years,
                  OSI may disclose to FRI, subject to OSI's obligations to Third
                  Parson (including, but not limited to, confidentiality
                  obligations), information concerning technical progress made
                  by OSI in connection with new assay development. If, upon such
                  disclosure by OSI, FRI wishes to enter into a similar research
                  collaboration and license agreement in respect of such now
                  assays, OSI may propose to FRI the terms of such an agreement.

                                      -9-
<PAGE>   11
4.       Treatment of Confidential Matter.

         4.1.     Confidentiality.

                  During the term of this Agreement and for a period of five
                  years following the termination of this Agreement, each party
                  shall continue to keep all information disclosed to the other
                  pursuant hereto strictly confidential and neither party shall
                  disclose such information to any third party (including Bayer)
                  nor use such information for any purposes other than the
                  purpose specified herein. The confidentiality obligations of
                  this Agreement shall not apply to:

                  (a)      information and materials which at the time of
                           disclosure are in the public domain; or

                  (b)      information which after disclosure becomes part of
                           public domain by publication or otherwise, except by
                           breach of this Agreement; or

                  (c)      information which the receiving party can demonstrate
                           it independently developed prior to the disclosure;
                           or

                  (d)      information disclosed to the receiving party by a
                           third party who has the right to make such
                           disclosure.

         4.2.     Restrictions on Transferring Materials. FRI and OSI recognize
                  that the biological, chemical and biochemical materials which
                  are part of the OSI Technology and FRI Technology represent
                  valuable commercial assets. Accordingly, nothing containing
                  herein shall be construed to permit either party to transfer
                  to any third person (including Bayer) any such material which
                  constitutes Technology owned by the other party. Additionally,
                  subject to FRI's rights as set forth herein, throughout the
                  term hereof and thereafter, FRI agrees not to transfer to any
                  third person any biological, chemical or biochemical materials
                  which are part of OSI Technology and which comprise, consist
                  of or are useful in the manufacture of any Licensed Product or
                  OSI Product, unless prior consent for any such transfer is
                  obtained from OSI.

         4.3.     Notwithstanding Sections 4.1 and 4.2 above, OSI may disclose
                  the Technology not related to the Clinical Diagnostic Product
                  and /or a Licensed Product, (which do not include the FRI
                  Technology), to Bayer based on OSI's agreement with Bayer.

5.       Patent Infringement and Hold Harmless.

         5.1.     Actual or Threatened Infringement by Third Persons. If
                  information comes to the attention of FRI or OSI to the effect
                  that any OSI Patent Rights relating to a Licensed Product have
                  been or are threatened or infringed, OSI shall have 



                                      -10-
<PAGE>   12
                  the right, at its expense, to take such action as it may deem
                  necessary to prosecute or prevent such infringement, including
                  the right to bring or defend any suit, action or proceeding
                  involving any such infringement. FRI or OSI shall notify the
                  other promptly of the receipt of any such information and OSI
                  shall notify FRI promptly of its commencement of any such
                  suit, action or proceeding. If OSI determines, and FRI agrees
                  that it is necessary or desirable for FRI to join any such
                  suit, action or proceeding, FRI shall execute all papers and
                  perform such other acts as may be reasonably required to
                  permit OSI to act in FRI's name, In the event that OSI brings
                  a suit, it shall be entitled to all sums recovered in such
                  suit or in its settlement. FRI always have the right to be
                  represented by counsel of its own selection and at its own
                  expense in any suit instituted by OSI for infringement, under
                  the terms of this Section. If OSI lacks standing to bring any
                  such suit, action or proceeding, then FRI shall have a right
                  to do so at the request of OSI and, with respect to expenses
                  approved in advance by OSI, at OSI's expense.

         5.2.     Infringement Claims Against the Parties. OSI hereby warrants
                  that the use of OSI Patent Rights or OSI Technology in the
                  manufacture, use or sale of a Licensed Product by FRI in Japan
                  will not constitute any infringement of any patent owned by
                  any third party. If FRI or OSI is sued by a Third Party for
                  infringement of a patent based upon the research, development,
                  manufacture, sale or use of a Licensed Product, the party sued
                  shall notify the other promptly of the commencement of any
                  such suit.

                  (a)      If the alleged infringement is due to the use of OSI
                           Technology or OSI Patent Rights, FRI shall give OSI
                           all authority (including the right to exclusive
                           control of the defense of any such suit, action or
                           proceeding and the exclusive right to compromise,
                           litigate, settle, or otherwise dispose of any such
                           suit, action or proceeding), information and
                           assistance necessary to defend or settle any such
                           suit, action or proceeding OSI shall bear all of the
                           expenses incurred in connection with such suit,
                           action or proceeding, and OSI shall indemnify and
                           hold FRI harmless from and against all liabilities,
                           losses, expenses (including reasonable legal
                           expenses) and damages arising from such patent
                           infringement.

                  (b)      If the alleged infringement is due to the use of FRI
                           Technology, OSI shall give FRI all authority
                           (including the right to exclusive control of the
                           defense of any such suit, action or proceeding and
                           the exclusive right to compromise, litigate, settle,
                           or otherwise dispose of any such suit, action or
                           proceeding), information and assistance necessary to
                           defend or settle any such suit, action or proceeding,
                           FRI shall bear all of the expenses incurred in
                           connection with such suit, action or proceeding, and
                           FRI shall indemnify and hold OSI harmless from and
                           against liabilities, losses, expenses (including
                           reasonable legal expenses) and damages arising from
                           such patent infringement.

                                      -11-
<PAGE>   13
         5.3.     Hold Harmless for Product Liability. FRI agrees to defend,
                  protect, indemnify, and hold harmless OSI from and against any
                  liability, claim, loss, cost or expense arising from any claim
                  for product liability based upon FRI's manufacture, use, or
                  sale of any Licensed Product except to the extent such
                  liability, claim, loss or expense also results from the
                  negligence or willful misconduct of OSI, its employees and
                  agents.

6.       Term and Termination.

         6.1.     Term. Subject to Section 6.4 hereof, this Agreement shall come
                  into force on the date first above written and shall, unless
                  sooner terminated pursuant to any provision of this Agreement,
                  be in full force until the expiration date of the last
                  to-expire OSI Patent Rights in Japan or for a period of ten
                  (10) years counting from the date of the first commercial sale
                  by FRI of a Licensed Product, whichever is longer.

         6.2.     Event(s) of Termination. The following events shall constitute
                  Events of Termination under this agreement.

                  (a)      Any representation or warranty by FRI or OSI, or any
                           of their officers, under or in connection with this
                           Agreement shall prove to have been incorrect in any
                           material respect when made; or

                  (b)      FRI or OSI shall fail in any material respect to
                           perform or observe any term, covenant or
                           understanding contained in this Agreement (including
                           OSI's inability to perform the collaborative research
                           in accordance with the terms of the Agreement due to
                           the departure of Walter P. Carney, Ph.D. from OSI) or
                           in any of the other documents or instruments
                           delivered pursuant to, or concurrently with, this
                           Agreement, and any such failure shall remain
                           unremediated for thirty (30) days after FRI's or
                           OSI's written notice to the other thereof.

                  (c)      Either party hereto shall have become insolvent or
                           bankrupt, or shall have made an assignment for the
                           benefit of its creditors, or that there shall have
                           been an appointed trustee or receiver of the other
                           party hereto for all or a substantial part of its
                           property, or that any case or proceeding shall have
                           been commenced or other action taken by or against
                           the other party in bankruptcy or seeking
                           reorganization, liquidation, dissolution, winding-up,
                           arrangement, composition or readjustment of its debts
                           or any other relief under any bankruptcy, insolvency,
                           reorganization or other similar act or law of any
                           jurisdiction now or hereafter in effect, or that
                           there shall have been issued a warrant of attachment,
                           execution, distraint or similar process against any
                           substantial part of the property of the other party
                           hereto, and 


                                      -12-
<PAGE>   14
                           any such event shall have continued for sixty (60)
                           days undismissed, unbounded and undischarged.

         6.3.     Termination. Upon the occurrence of any of such Events of
                  Termination as specified in (a) through (c) of Section 6.2
                  hereof, FRI or OSI shall have the right, by written notice to
                  the other, to immediately terminate this Agreement. Upon any
                  such termination, OSI shall not be obligated to return to FRI
                  any amounts then previously paid to OSI hereunder. Upon any
                  such termination, the licenses granted to FRI hereunder shall
                  remain in effect only in respect of those Proprietary Assays
                  for which FRI has provided Research Funding pursuant to
                  Section 3.2 and only to the extent that FRI meets its
                  obligations to pay royalties in respect thereof throughout the
                  period specified in Section 6.1.

         6.4.     Survival. Without limitation, the rights and obligations
                  arising from the following provisions shall survive any
                  expiration or termination of this Agreement: Articles 1, 2,4,
                  5, 6, 7 and 9-12.

7.       Representations and Warranties. OSI and FRI each represent and warrant
         as follows:

         7.1.     It is a corporation duly organized, validly existing and in
                  good standing (if applicable) under the laws of the
                  jurisdiction of its incorporation. It is qualified to do
                  business and is in good standing (if applicable) as a foreign
                  corporation in each jurisdiction in which the conduct of its
                  business or the ownership of its properties requires such
                  qualification. It has all requisite power and authority,
                  corporate or otherwise, to conduct its business as now being
                  conducted, to own, lease and operate its properties and to
                  execute, deliver and perform this Agreement.

         7.2.     The execution, delivery and performance by it of this
                  Agreement has been fully authorized by all necessary corporate
                  action and does not and will not (a) require the consent or
                  approval of its stockholders, (b) violate any provision of any
                  law, rule, regulation, order, write, judgment, injunction,
                  decree, determination or award presently in effect having
                  applicability to it or any provision of its charter or by-laws
                  or (c) result in a breach of or constitute a default under any
                  material agreement, mortgage, lease, license, permit or other
                  instrument or obligation to which it is a party or by which it
                  or its properties may be bound or affected.

         7.3.     This Agreement is a legal, valid and binding obligation of it
                  enforceable against it in accordance with its terms and
                  conditions, except as such enforceability may be limited by
                  applicable bankruptcy, insolvency, moratorium, reorganization
                  or similar laws, from time to time in effect, affecting
                  creditors' rights generally.

         7.4.     It is not under any obligation to any person, contractual or
                  otherwise, that is conflicting or inconsistent in any respect
                  with the terms of this Agreement or that would impede the
                  diligent and complete fulfillment of its obligations
                  hereunder. 


                                      -13-
<PAGE>   15
                  OSI further represents and warrants to FRI that OSI's
                  relationship with Bayer does not prohibit OSI's diligent and
                  complete fulfillment of its obligations hereunder.

         7.5.     It has good and marketable title to or valid leases or
                  licenses for, all of its properties, rights and assets
                  necessary for the fulfillment of its responsibilities under
                  this Agreement, subject to no claim of any third person other
                  than the relevant lessors or licensers.

8.       Covenants of OSI and FRI. Throughout the term of the Agreement, each of
         OSI and FRI shall:

                  (a)      Maintain and preserve its corporate existence,
                           rights, franchises and privileges in the jurisdiction
                           of its incorporation, and qualify and remain
                           qualified as a foreign corporation in good standing
                           (if applicable) in each jurisdiction in which such
                           qualification is from time to time necessary or
                           desirable in view of its business and operations or
                           the ownership of its properties; and

                  (b)      Comply in all material respects with the requirements
                           of all applicable laws, rules, regulations and orders
                           of any government authority to the extent necessary
                           to conduct the OSI/FRI Annual Operating Plan.

9.       Dispute Resolution. Any disputes, controversies, or difficulties which
         may arise out of or in relation to this Agreement shall be settled
         amicably between the parties. In the event the parties fail to do so,
         such dispute, controversy or difficulty shall be finally settled by
         arbitration at the place of the defendant's principal place of business
         (as set forth herein) by the International Chamber of Commerce ("ICC")
         pursuant to the arbitration rules of the ICC and by arbitrators of be
         appointed according to said rules. The award in the said arbitration
         shall be final and binding, and may include the reasonable legal fees
         of the prevailing party.

10.      Notices. All notices shall be mailed via certified mail, return receipt
         requested, or courier, addressed as follows, or to such other address
         as may be designated from time to time:

         For FRI: To FRI at its address as set forth at
                  the beginning of this Agreement,
                  Attention:  CEO of Fujirebio Inc. (Koichiro FUJITA, M.D.)
                  with a copy to: Manager of Legal Department, Fujirebio Inc.

         For OSI: To OSD and OSIP at its address as set forth at
                  the beginning of this Agreement,
                  Attention(OSD):  Walter P. Carney, Ph.D., President
                  Attention(OSIP):  Robert L. Van Nostrand, CFO

                                      -14-
<PAGE>   16
Notices shall be deemed given as of the date of receipt.

11.      Governing Law. This Agreement shall be governed by and construed in
         accordance with the laws of the State of New York, without regard to
         its conflicts of laws principles.

12.      Miscellaneous.

         12.1.    Binding Effect. This Agreement shall be binding upon and inure
                  to the benefit of the parties and their respective legal
                  representatives, successors and permitted assigns.

         12.2.    Headings. Paragraph headings are inserted for convenience of
                  reference only and do not form part of this Agreement.

         12.3.    Counterparts. This Agreement may be executed simultaneously in
                  two or more counterparts, each of which shall be deemed an
                  original.

         12.4.    Amendment, Waiver, etc. This Agreement may be amended,
                  modified, superseded or canceled, and any of the terms may be
                  waived, only by a written instrument executed by each party
                  or, in the case of waiver, by the party or parties waving
                  compliance. The delay or failure of any party at any time or
                  times to require performance of any provision shall in no
                  manner affect the rights at a later time to enforce the same.

         12.5.    No Third Party Beneficiaries. No Person not a party to this
                  Agreement, including any employee of any party to this
                  Agreement, shall have or acquire any right s by reason of this
                  Agreement. Neither party shall enter in to or incur, or hold
                  itself out to third parties as having authority to enter into
                  or incur on behalf of the other party, any contractual
                  obligation, expense, or liability whatsoever. The performance
                  of each party hereunder is undertaken as an independent
                  contractor, and nothing contained in this Agreement shall be
                  deemed to constitute the parties partners with each other or
                  any Person.

         12.6.    Assignment and Successors. This Agreement may not be assigned
                  by either party, except that either party may assign this
                  Agreement and the rights and interests of such party to an
                  Affiliate, or a purchaser of substantially all of the assets
                  of such party's business to which this Agreement pertains,
                  upon notice to the other party.

         12.7.    Severability. If performance of this Agreement or any part
                  hereof by either party shall be rendered unenforceable or
                  impossible under, or in conflict with any law, regulation, or
                  official action by any government agency having jurisdiction
                  over such party, then such party shall not be considered in
                  default by reason of failure to perform and the validity of
                  all remaining provisions hereof shall not be affected by such
                  result.

                                      -15-
<PAGE>   17
         12.8.    Unforeseen Circumstances. Neither party shall be liable in
                  damages for, nor shall the Contract Period be terminated by
                  reason of, any delay or default in any such party's
                  performance hereunder if such default or delay is caused by
                  events beyond such party's reasonable control including,
                  without limitations, acts of God, regulation or law or other
                  action of any government or agency thereof, war or
                  insurrection, civil commotion, destruction of production
                  facilities or materials by earthquake, fire, flood or storm,
                  labor disturbances, epidemic, or failure of suppliers, public
                  utilities or common carriers. Each party agrees to endeavor to
                  resume its performance hereunder if such performance is
                  delayed or interrupted by reason of such forces majeure as
                  listed above.

         12.9.    Integration. This writing constitutes the entire agreement
                  between the parties relating to the subject matter hereof.
                  There are no understandings, representations, or warranties of
                  any kind except as expressly set forth herein.



                                      -16-
<PAGE>   18
         IN WITNESS WHEREOF, the parties have caused this Agreement to be
executed by their duly authorized representatives.

                                   FUJIREBIO INC.


                                   By:      /s/   Koichiro FUJITA, M.D.
                                            --------------------------------
                                            Koichiro FUJITA, M.D.
                                            Title:  President and CEO



                                   ONCOGENE SCIENCE DIAGNOSTICS, INC.


                                   By:      /s/   Walter P. Carney, Ph.D.
                                            --------------------------------
                                            Walter P. Carney, Ph.D.
                                            Title:  President



                                    OSI PHARMACEUTICALS, INC.


                                    By:      /s/   Robert L. Van Nostrand
                                            --------------------------------
                                            Robert L. Van Nostrand
                                            Title: CFO


                                      -17-
<PAGE>   19
Exhibit A:    Proprietary Assays and Collaborative Research Projects

Research Year(Period)                          Proprietary Assays      Projects

1st Year:     15 JUN 1998 - 14 JUN 1999        **                        (i)

2nd Year:     15 JUN 1999 - 14 JUN 2000        **                        (ii)

3rd Year:     15 JUN 2000 - 14 JUN 2001        **                        (iii)

4th Year:     15 JUN 2001 - 14 JUN 2002        **                        (iv)


(Collaborative Research Projects)
(i)        **

(ii)       **

(iii)      **

(iv)       **



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         treatment.


                                      -18-
<PAGE>   20
Exhibit B:        OSI Products(ELISA format)

                                                                 OSD Product #

                           **                                    **



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         treatment.



                                      -19-
<PAGE>   21
Exhibit C:  OSI Patent Lists

           **
1          **

2.         **




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         treatment.



                                      -20-
<PAGE>   22
Exhibit D:        OSI/FRI Annual Operating Plan

   **




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         treatment.



                                      -21-
<PAGE>   23
Exhibit-E.        A list of independent public accountants

1.       KPMG Peat Marwick (in Japan)

         Address:

         Tel No.:

         Fax No:

         FRI will confirm to OSI that the above one is acceptable or not by the
         launch of Licensed Products, which such acceptance shall not be
         unreasonably withheld.



                                      -22-

<PAGE>   1
         Portions of this Exhibit 10.4 have been redacted and are the subject of
a confidential treatment request filed with the Secretary of the Securities and
Exchange Commission.
<PAGE>   2
                                LICENSE AGREEMENT

This Agreement is made this 26th day of May 1998 (the "Effective Date"), by and
between the OSI Pharmaceuticals, Inc. ("OSI"), a Delaware corporation with
principal offices at 106 Charles Lindbergh Blvd., Uniondale, New York 11553-3649
and Aurora Biosciences Corporation ("ABSC"), a Delaware corporation with
principal offices at 11010 Torreyana Road, San Diego, California 92121.

                                    RECITALS

WHEREAS, OSI is the owner of the Assay Patents defined herein, and the Method of
Modulation Patents defined herein; and is willing to grant a license under such
patents to ABSC; and

WHEREAS, ABSC wishes to obtain a license under the Assay Patents and an option
to obtain a license under the Method of Modulation Patents, according to the
terms contained herein;

Now, therefore, in consideration of the covenants and premises contained herein,
the parties agree as follows:

1.       DEFINITIONS

         1.1.     "Act" is defined in Section 3.1.1.

         1.2.     "Affiliate" means any corporation or other business entity
                  controlled by or under common control with, a party to this
                  Agreement or a Third Party. Control, as used in the context of
                  a business entity, means the ownership, directly or
                  indirectly, of fifty percent (50%), or greater, or the maximum
                  interest permitted by local law of the voting securities of
                  the corporation or other entity or a fifty percent (50%) or
                  greater interest in the income of such corporation or other
                  entity or the ability otherwise to manage the affairs of such
                  corporation or other entity.

         1.3.     "Assay Patents" means the U.S. patents and patent applications
                  listed on Exhibit A hereto, any patent applications filed
                  prior or subsequent to the Effective Date that claim the
                  benefit of the filing date of any patent application listed in
                  Exhibit A and any reissues, extensions, substitutions,
                  confirmations, re-registrations, re-examinations,
                  continuations, divisionals or continuations-in-part of the
                  foregoing patents and patent applications, as well as all
                  foreign counterparts thereof, to the extent that such patents
                  and patent applications are not Method of Modulation Patents.

         1.4.     "Aurora Assay" means **  .

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**       This portion has been redacted pursuant to a request for confidential 
         treatment.
<PAGE>   3
         1.5.     "Aurora Technology" means all Technology owned or controlled
                  by ABSC which is not an Aurora Assay.

         1.6.     "Confidential Information" means all information received by
                  either party from the other party pursuant to this Agreement,
                  which is deemed confidential by the disclosing party and is
                  designated confidential at the time the information is
                  disclosed, subject to the exceptions set forth in Section 8.1.

         1.7.     "Cosmeceuticals" means compounds, or assays for discovering
                  compounds, useful for (a) stimulation or control of hair
                  growth, (b) prevention or reversal of wrinkling of the skin,
                  or (c) alteration of skin or hair pigmentation, in each case
                  in human subjects.

         1.8.     "FDA" means the United States Food and Drug Administration, or
                  any successor agency having regulatory jurisdiction over the
                  manufacture, distribution and sale of drugs in the United
                  States or the equivalent agency in any other country.

         1.9.     "IND" means an Investigational New Drug application in the
                  United States or the equivalent application in any other
                  country.

         1.10.    "Intellectual Property" means any information and data which
                  is not generally known to the public, any new and useful
                  process, machine, manufacture, or composition of matter, or
                  improvement thereto, whether or not patentable, designs,
                  concepts, algorithms, formulae, software, techniques,
                  practices, processes, methods, knowledge, skill, experience,
                  expertise and technical information; copyrights; trade
                  secrets; or patent rights (including pending and issued patent
                  rights anywhere in the world).

         1.11.    "Materials" means any biological or chemical entity for
                  screening or assays, including reagents, cells, promoters,
                  enhancers, vectors, plasmids, proteins and fragments thereof,
                  peptides, antigens, antibodies, antagonists, agonists,
                  inhibitors, and chemicals.

         1.12.    "Method of Modulation Patents" means the U.S. patents and
                  patent applications listed on Exhibit A hereto, any patent
                  applications filed prior or subsequent to the Effective Date
                  that claim the benefit of the filing date of any patent
                  application listed in Exhibit A, and any reissues, extensions,
                  substitutions, confirmations, re-registrations,
                  re-examinations, continuations, divisionals or
                  continuations-in-part of the foregoing patents and patent
                  applications, as well as all foreign counterparts thereof, to
                  the extent such patents and patent applications claim an in
                  vivo method of modulation of a gene of interest or a
                  composition useful in such a method.

         1.13.    "NDA" means a New Drug Application or Product License
                  Application, as appropriate in the United States or the
                  equivalent application in any other country.


                                       2
<PAGE>   4
         1.14.    "Net Sales" means the gross amounts actually received by ABSC
                  and its Affiliate and Sublicensees and their Affiliates from
                  arms' length sales of Product(s) to Third Parties whether
                  invoiced or not, less:

                  (i)      Trade, quantity and cash discounts allowed;

                  (ii)     Refunds, rebates, chargebacks, retroactive price
                           adjustments, and any other allowances which
                           effectively reduce the net selling price and are
                           appropriately deducted from sales under generally
                           accepted accounting principles;

                  (iii)    Product returns and allowances;

                  (iv)     Any tax imposed on the Product that is appropriately
                           deducted from sales under generally accepted
                           accounting principles;

                  (v)      That portion of the amount received associated with
                           mechanical drug delivery devices; and

                  (vi)     Allowance for distribution expenses.

                  Such amounts shall be determined from the books and records of
                  ABSC and its Affiliates and Sublicensees and their Affiliates,
                  as appropriate, maintained in accordance with generally
                  accepted accounting principles ("GAAP"), consistently applied.

                  In the event a Product is sold in combination with another
                  product(s), the Net Sales from the combination product, for
                  the purposes of determining royalty payments, shall be
                  determined by multiplying the Net Sales of the combination
                  product by the fraction, A/(A+B) where A is the average sale
                  price of the Product when sold separately and B is the average
                  sale price of the other product(s) when sold separately in
                  finished form. In the event that such average sale price
                  cannot be determined for either the Product or other
                  product(s) in such combination product, Net Sales for purposes
                  of determining royalty payments shall be calculated by
                  multiplying the Net Sales of the combination product by the
                  fraction C/(C+D) where C is the cost of manufacturing the
                  Product and D is the cost of manufacturing the other
                  product(s), determined in accordance with GAAP, consistently
                  applied.

         1.15.    "Product" means any human pharmaceutical product sold by ABSC
                  and/or an Affiliate of ABSC to a Third Party, the manufacture,
                  use, importation or sale of which in a specific country would
                  in the absence of this Agreement infringe an issued or granted
                  claim in a Method of Modulation Patent in such country and
                  which was discovered or developed by an activity which in the
                  absence of a license would infringe an issued or granted claim
                  in an Assay Patent.

         1.16.    "Shares" is defined in Section 3.1.1.

                                       3
<PAGE>   5
         1.17.    "Sublicensee" means a Third Party and its Affiliates (if any)
                  that obtain a sublicense from ABSC under the Assay Patents or
                  the Method of Modulation Patents, or both.

         1.18.    "Target" means a specific gene.

         1.19.    "Technology" means Materials, Intellectual Property, or both.

         1.20.    "Term" has the meaning set forth in Section 9.1.1.

         1.21.    "Third Party" means any entity other than (i) ABSC and any of
                  its Affiliates and (ii) OSI and any of its Affiliates.

2.       LICENSES

         2.1.     Licenses Under the Assay Patents.

                  2.1.1.   OSI hereby grants to ABSC and its Affiliates**

                  2.1.2.   OSI hereby grants to ABSC and its Affiliates**


         ------------
         **  This portion has been redacted pursuant to a request
             for confidential treatment.


                                       4
<PAGE>   6

                  2.1.3.   Within 30 days after the end of each calendar quarter
                           so long as this Agreement is in effect, ABSC shall
                           provide to OSI for such calendar quarter a written
                           quarterly report which indicates the following: (i)**
                           (ii) the date of **; and (iii) **.

                  2.1.4.   OSI agrees **.

         2.2.     Right to Grant Sublicenses Under the Assay Patents.

                  2.2.1.   OSI hereby grants to ABSC **.


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** This portion has been redacted pursuant to a request for confidential 
   treatment.


                                       5
<PAGE>   7
                  2.2.2.   Sublicenses under Section 2.2.1 may be granted by
                           ABSC**

                  2.2.3.   Commencing on the Effective Date, sublicenses under
                           Section 2.2.1. may be granted by ABSC**

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**   This portion has been redacted pursuant to a request for confidential 
     treatment.

                                       6
<PAGE>   8
                  2.2.4.   Within 30 days after the Effective Date ABSC**

                  2.2.5.   ABSC shall within 30 days after entering into any
                           sublicense provide to OSI a copy thereof; provided,
                           however**

         2.3.     Option to Obtain A License Under the Methods of Modulation
                  Patents.

                  2.3.1.   Subject to Section 5, OSI hereby grants to ABSC and
                           its Affiliates**

                  2.3.2.   ABSC may**

                  2.3.3.   If ABSC**

                  2.3.4.   To the extent that OSI has** Exhibit C within 12
                           months of the Effective Date Exhibit C will be
                           limited to the lesser 

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     treatment.


                                       7
<PAGE>   9
                           number** so listed; provided, however, that
                           if ABSC grants a sub-license**

                  2.3.5.   With respect to any Target listed on Exhibit C which
                           OSI licenses to a Third Party on at least a
                           coexclusive basis OSI will notify ABSC within 30 days
                           of granting such license that such Target is no
                           longer available for licensing to ABSC or any other
                           Third Party.

                  2.3.6.   If prior to OSI's granting at least a coexclusive
                           license to a Third Party under the Method of
                           Modulation Patents with respect to any Target listed
                           on Exhibit C, ABSC notifies OSI that ABSC wishes to
                           obtain a license with respect to such Target, OSI
                           agrees to negotiate with ABSC using good faith
                           efforts the terms of a nonexclusive license with
                           respect to such Target.

         2.4.     Right To Grant Sublicenses Under The Method of Modulation
                  Patents.

                  2.4.1.   Subject to Section 5, OSI hereby grants ABSC**

                  2.4.2.   Sublicenses under Section 2.4.1. may be granted by
                           ABSC**

                  2.4.3.   ABSC shall within 30 days after entering into any
                           sublicense under the Method of Modulation Patents
                           provide to OSI a copy thereof.

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**   This portion has been redacted pursuant to a request for confidential 
     treatment.

                                       8
<PAGE>   10
         2.5.     Right To Require OSI To Grant Direct Licenses Under Method of
                  Modulation Patents.

                  2.5.1.   Subject to Section 5, OSI hereby agrees**

                  2.5.2.   OSI will grant direct licenses pursuant to Section
                           2.5.1. to any Third Party to which ABSC has granted a
                           sublicense under the Assay Patents pursuant to
                           Section 2.2.1. for (i) the specific Target which was
                           the subject of a sublicense under the Assay Patents
                           limited to a specific Target or (ii) any specific
                           Target if such sublicense under the Assay Patents was
                           unlimited as to the number of Targets; provided such
                           Third Party accepts and signs such direct license
                           prior to the date on which such Third Party commences
                           good laboratory practice preclinical development of a
                           compound which affects such specific Target and which
                           has resulted from such Third Party's use of Aurora
                           Technology or an Aurora Assay.

                  2.5.3.   In addition to those Third Parties to which OSI will
                           grant direct licenses as provided in Section 2.5.2.,
                           OSI will grant direct licenses for a specific target
                           pursuant to Section 2.5.1. to any Third Party for
                           whose benefit ABSC or an Affiliate of ABSC uses, but
                           to whom ABSC and Affiliates of ABSC do not transfer,
                           an Aurora Assay for such specific Target; provided
                           such Third Party accepts and signs such direct
                           license prior to the date on which such Third Party
                           commences good laboratory practice preclinical
                           development of a compound which affects such specific
                           Target and which has resulted from use of Aurora
                           Technology or an Aurora Assay by ABSC or an Affiliate
                           of ABSC.

                  2.5.4.   The financial terms of any direct license granted to
                           such Third Party pursuant to Section 2.5.1. shall be
                           the same and the nonfinancial terms thereof shall be
                           substantially the same as those of a sublicense
                           authorized pursuant to Section 2.4.1.


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   confidential treatment.



                                       9
<PAGE>   11
                  2.5.5.   If a Third Party otherwise eligible to receive a
                           direct license from OSI pursuant to Section 2.5.1.
                           fails to accept and sign such a direct license with
                           respect to any Target within the time period provided
                           under Section 2.5.2. or 2.5.3., the obligation of OSI
                           to grant such a direct license shall expire with
                           respect to such Target.

                  2.5.6.   If prior to OSI's granting at least a coexclusive
                           license to a Third Party under the Method of
                           Modulation Patents with respect to any Target listed
                           on Exhibit C, ABSC notifies OSI that ABSC wishes OSI
                           to grant a direct license with respect to such Target
                           to a Third Party to which ABSC has granted a
                           sublicense under the Assay Patents for such Target,
                           OSI agrees to negotiate with such Third Party using
                           good faith efforts the terms of a nonexclusive
                           license with respect to such Target.

         2.6.     Right To Require OSI To Grant Direct Licenses Under Assay
                  Patents

                  2.6.1.   OSI hereby agrees **

                  2.6.2.   OSI will grant such direct licenses to any Third
                           Party and its Affiliates to which ABSC may grant a
                           sublicense subject to the applicable time limit and
                           in accordance with the terms of ABSC's right to grant
                           sublicenses under the Assay Patent pursuant to
                           Section 2.2. Compensation to OSI will be the same as
                           set forth in Section 3.2; provided, however that ABSC
                           will not receive or owe any payment for direct
                           licenses granted by OSI.


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   treatment.




                                       10
<PAGE>   12
3.       COMPENSATION

         3.1.     Compensation for the License Under the Assay Patents.

                  3.1.1.   As full consideration for the license granted to ABSC
                           pursuant to Section 2.1.1. herein, ABSC shall on the
                           Effective Date a) pay to OSI a non-refundable payment
                           of $50,000 and b) irrevocably issue to OSI an
                           aggregate of seventy five thousand (75,000) shares of
                           ABSC's common stock (the "Shares"). Such Shares will
                           be tradeable one year from the Effective Date,
                           subject to applicable securities laws. All
                           certificates representing the Shares shall have
                           endorsed thereon legends in substantially the
                           following forms: (i) the securities represented by
                           this certificate have not been registered under the
                           Securities Act of 1933, as amended (the "Act") and
                           they may not be sold or offered for sale or otherwise
                           distributed unless the securities are registered
                           under the Act or an exemption therefrom is available
                           and (ii) any other legend required to be placed
                           thereon by applicable state, federal or foreign
                           securities laws. OSI acknowledges that it is aware
                           that the Shares have not been registered under the
                           Act and that the Shares are deemed to constitute
                           "restricted securities" under Rule 144 under the Act.
                           No royalties or milestones or additional target fees
                           will be due pursuant to the license under Section
                           2.1.1. except as provided therein.

                  3.1.2.   As full consideration for (i) ABSC's option under
                           Section 2.3., (ii) ABSC's right to grant sublicenses
                           under Section 2.4., and (iii) ABSC's right to require
                           OSI to grant direct licenses under Section 2.5., ABSC
                           will pay to OSI a payment of two hundred and fifty
                           thousand dollars ($250,000) within thirty (30) days
                           of the Effective Date and annual payments of **, each
                           such annual payment being due on each anniversary of
                           the Effective Date. The initial $250,000 payment made
                           under this Section 3.1.2. shall be creditable against
                           the first $250,000 which ABSC is obligated to pay OSI
                           pursuant to Sections 3.2. and 3.4.

         3.2.     Compensation for Sublicenses Under The Assay Patents.

                  3.2.1.   For each sublicense granted by ABSC under Section
                           2.2., for a specific Target, ABSC will pay to OSI
                           each year commencing on the effective date of such
                           sublicense and on each anniversary date thereafter
                           that such sublicense is in effect, the greater of **
                           or ** of all sublicense income received by ABSC
                           pursuant to Section 3 of such sublicense. OSI agrees
                           and acknowledges that ABSC shall retain for itself
                           the remainder of the sublicense income, either ** or
                           ** of such sublicense income each year.


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         treatment.

                                       11
<PAGE>   13
                  3.2.2.   For each sublicense granted by ABSC under Section
                           2.2. for an unlimited number of Targets, ABSC will
                           pay to OSI each year commencing on the effective date
                           of such sublicense and on each anniversary date
                           thereafter that such sublicense is in effect, the
                           greater of (i) ** or (ii) ** of all sublicense income
                           received by ABSC pursuant to Section 3 of such
                           sublicense. OSI agrees and acknowledges that ABSC
                           shall retain for itself the remainder of the
                           sublicense income, either ** or ** of such sublicense
                           income each year.

         3.3.     Compensation for Licenses Under the Method of Modulation
                  Patents.

                  3.3.1.   For each license granted to ABSC pursuant to Section
                           2.3., ABSC will pay OSI each year commencing on the
                           effective date of such license and on each
                           anniversary date thereafter that such license is in
                           effect, an annual license fee of ** on a Target by
                           Target basis.

                  3.3.2.   For the first Product directed against each such
                           Target that reaches the following milestone events
                           and for which ABSC has a license pursuant to Section
                           2.3., ABSC will pay OSI within 30 days of such
                           milestone event the following amounts:

                                    Milestone Event                Payment (US$)

                           i)   Upon filing an IND with the FDA         **

                           ii)  Upon acceptance of the filing of 
                                an NDA by the FDA                       **
                                

                  3.3.3.   For each Target for which ABSC is granted a license
                           pursuant to Section 2.3. only one payment will be
                           required for each such milestone event regardless of
                           the number of Products directed against such Target
                           for which ABSC achieves such milestone events.

                  3.3.4.   For each Product directed against each Target for
                           which ABSC has been granted a license pursuant to
                           Section 2.3., ABSC will also pay to OSI a royalty of
                           ** of Net Sales of all such Products sold by ABSC and
                           its Affiliates on a country by country basis. If a
                           human pharmaceutical product is made, used and sold
                           in a country where no Method of Modulation Patent
                           exists, it is not a Product for purposes of this
                           agreement and no royalty is due on its sale.

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                                       12
<PAGE>   14
         3.4.     Compensation for Sublicenses Under the Method of Modulation
                  Patents.

                  3.4.1.   For each sublicense granted by ABSC pursuant to
                           Section 2.4.1., ABSC will pay to OSI each year
                           commencing on the effective date of such sublicense
                           and on each anniversary date thereafter that such
                           sublicense is in effect, for each specific Target for
                           which a sublicense is granted the greater of (i) **
                           or (ii) ** of the sublicense fees received by ABSC
                           pursuant to Section 3 of each such sublicense. OSI
                           agrees and acknowledges that ABSC shall retain for
                           itself the remainder of the sublicense fees, either
                           ** or ** of such sublicense fees each year.

                  3.4.2.   For the first Product directed against each such
                           Target that reaches the following milestone events
                           and for which ABSC has granted a sublicensee pursuant
                           to Section 2.4., ABSC will also pay OSI within 30
                           days of such milestone event the following amounts:

                                    Milestone Event                Payment (US$)

                           i)   Upon filing an IND with the FDA          **

                           ii)  Upon acceptance of the filing of 
                                an NDA by the FDA                        **
                                

                  3.4.3.   For each Target for which a sublicense is granted to
                           a specific Third Party as Sublicensee pursuant to
                           Section 2.4., only one payment will be required for
                           each such milestone event, regardless of the number
                           of Products directed against such Target for which
                           such Sublicensee achieves such milestone events.

                  3.4.4.   For each Product directed against each Target for
                           which ABSC has granted a sublicense pursuant to
                           Section 2.4., ABSC will also pay to OSI a royalty of
                           ** of Net Sales of all such Products sold by each
                           such Sublicensee and its Affiliates on a country by
                           country basis. If a human pharmaceutical product is
                           made, used and sold in a country where no Method of
                           Modulation Patent exists, it is not a Product for
                           purposes of this agreement and no royalty is due on
                           its sale.

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                                       13
<PAGE>   15
                  3.4.5.   OSI agrees and acknowledges that ABSC shall retain
                           for itself any amounts paid to it by a Sublicensee in
                           excess of the amounts that it is required to pay OSI
                           pursuant to this Section 3.4.

4.       ROYALTY PAYMENTS

         4.1.     Royalties payments due from ABSC to OSI shall be paid within
                  sixty (60) days after the end of each calendar quarter during
                  which the royalty payment accrued. Each such payment shall be
                  accompanied by a statement certified by an officer of ABSC
                  with respect to each country indicating the amount of the
                  payment, the total Net Sales of each Product sold in the
                  country and the amount of royalty due.

         4.2.     To the extent that it is lawful and practicable to do so, ABSC
                  shall make all royalty payments required under this Agreement
                  in the United States of America in U.S. Dollars. The royalty
                  payments due on each sale made outside the United States in a
                  currency other than U.S. Dollars shall be translated at the
                  rate of exchange at which U.S. Dollars are legally obtainable
                  at Citibank, N.A. in New York, New York, United States of
                  America, for the currency of the country in which the royalty
                  payment is accrued on the last business day of the calendar
                  month in which the sale was made. ABSC shall not be required
                  to make any royalty payment in contravention of the laws of
                  any country, nor shall ABSC be required to make the royalty
                  payment in the United States of America if ABSC is unable to
                  recoup the amount of such royalty or sublicense payment
                  directly or indirectly from the country in which the sales on
                  which such payment is based are made. In each country where
                  the local currency is blocked and cannot be removed from the
                  country, ABSC shall, at OSI's request, pay the royalty payment
                  accrued in each such country to OSI in local currency by
                  deposit to OSI's account at a local bank designated by OSI.

         4.3.     ABSC shall keep full and true books of account and records of
                  all sales of Product and Net Sales attributable to sales by
                  ABSC and its Affiliates. OSI shall have the right, at OSI's
                  expense, through an independent accountant reasonably approved
                  by ABSC to examine such books and records at any reasonable
                  time during business hours after notifying ABSC of its desire
                  to do so. Such examination shall be conducted no more often
                  than once each year and shall cover no more than the 3
                  preceding years. Such independent accountant shall report only
                  on the accuracy of such books and records and the reports
                  based thereon and shall not disclose specific entries to OSI.

5.       RENEGOTIATION OF TERMS FOR FUTURE LICENSES AND SUBLICENSES UNDER THE
         METHOD OF MODULATION PATENTS.

         5.1.     Commencing with the ** of the Effective Date ABSC's rights to
                  (i) exercise the option provided in Section 2.3., (ii) grant
                  sublicenses in accordance 

______________

** This portion has been redacted pursuant to a request for confidential 
   treatment.

                                       14
<PAGE>   16
                  with Section 2.4., or (iii) require OSI to grant direct
                  licenses in accordance with Section 2.5. shall renew
                  thereafter as set forth below. So long as OSI has not granted
                  any naked, nonexclusive license under the Method of Modulation
                  Patents to a Third Party, ABSC's foregoing rights shall renew
                  on the same Terms as set forth in Sections 2.3., 2.4. and 2.5.
                  If prior to the ** of the Effective Date OSI has granted at
                  least one naked, nonexclusive license under the Method of
                  Modulation Patents to a Third Party, without or without a
                  right to grant further sublicenses, OSI shall 60 days prior to
                  such ** notify ABSC in writing as to the terms of whichever
                  such license are least favorable to OSI. ABSC shall thereafter
                  have the option, by notifying OSI in writing within 60 days of
                  receiving OSI's notification of such terms, to either
                  substitute such terms for those set forth herein for new
                  licenses or terminate its rights under Sections 2.3., 2.4. and
                  2.5. So long as ABSC does not terminate its rights under
                  Sections 2.3., 2.4. and 2.5. as of the ** or any subsequent
                  anniversary of the Effective Date, OSI 60 days prior to each
                  subsequent anniversary shall notify ABSC in writing as to the
                  terms of whichever then-existing, naked nonexclusive
                  sublicense under the Method of Modulation Patents is least
                  favorable to OSI. ABSC shall thereafter have the option, by
                  notifying OSI in writing within 60 days of receiving OSI's
                  notification of such terms, to either substitute such terms
                  for those set forth herein for new licenses or to terminate
                  its rights under Sections 2.3., 2.4 and 2.5. For purposes of
                  this Section 5.1., "naked, nonexclusive license" means a
                  license granted by OSI under the Method of Modulation Patents
                  in a transaction which only involves financial consideration
                  for such license. As such a naked, nonexclusive license
                  excludes transactions involving research, development, or
                  marketing collaborations as well as those involving
                  consideration in the form of non-publicly traded equity. OSI
                  and ABSC each acknowledge that the terms applicable to
                  Sections 2.3., 2.4. and 2.5. after the ** of the Effective
                  Date may be greater than, the same as, or less than, those set
                  forth in this Agreement as of the Effective Date.

         5.2.     OSI and ABSC agree that all licenses and sublicenses granted
                  before ABSC notifies OSI that it is exercising its option to
                  substitute other terms for those then applicable shall
                  continue to be subject to the terms under which such licenses
                  or sublicenses were granted. Such other terms shall apply only
                  to licenses and sublicenses granted subsequent to such
                  notification by ABSC.

         5.3.     ABSC shall have the right, at ABSC's expense, through an
                  independent accountant reasonably approved by OSI to examine
                  all naked, nonexclusive licenses granted by OSI under the
                  Method of Modulation Patents at any reasonable time during
                  business hours after notifying OSI of its desire to do so for
                  the sole purpose of verifying that OSI has notified ABSC
                  pursuant to Section 5.1. as to the terms of whichever such
                  license are least favorable to OSI. Such examination shall be
                  conducted no more often than once each year. Such independent
                  accountant shall only verify that OSI has notified ABSC as to
                  the 

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                  confidential treatment.

                                       15
<PAGE>   17
                  terms of whichever such license are least favorable to OSI but
                  shall not disclose other specific details of such licenses to
                  ABSC.

6.       PROTECTION AND MAINTENANCE OF PATENT RIGHTS

         6.1.     OSI shall have complete control, at its expense and within its
                  sole discretion, over the prosecution, maintenance and
                  enforcement of the Assay Patents and the Method of Modulation
                  Patents. OSI will provide ABSC and any Sub-Licensee of ABSC
                  with written updates on the status of the prosecution of the
                  Assay Patents and the Method of Modulation Patents at least
                  once per year.

7.       REPRESENTATIONS AND WARRANTIES

         7.1. Representations and Warranties of ABSC and OSI.

                  As of the Effective Date each party hereby represents and
                  warrants:

                  Corporate Power. Such party is duly organized and validly
                  existing and in good standing under the laws of the state of
                  its incorporation and has all requisite corporate power and
                  authority to enter into this Agreement and to carry out the
                  provisions hereof.

                  Due Authorization. Such party is duly authorized to execute
                  and deliver this Agreement and to perform its obligations
                  hereunder.

                  Binding Agreement. This Agreement is a legal and valid
                  obligation binding upon it and enforceable in accordance with
                  its terms. The execution, delivery and performance of this
                  Agreement by such party does not conflict with any agreement,
                  instrument or understanding, oral or written, to which it is a
                  party or by which it may be bound, nor violate any law or
                  regulation of any court, governmental body or administrative
                  or other agency having jurisdiction over it.

                  Patents. Each party acknowledges and agrees that nothing in
                  this Agreement shall be construed as a warranty or
                  representation (i) as to the validity of any claim of an Assay
                  Patent or Method of Modulation Patent or (ii) that any Product
                  is, or will be, free from infringement of patents of Third
                  Parties.

         7.2.     Representations and Warranties of ABSC.

                  As of the Effective Date ABSC further represents and warrants
                  to OSI:

                  Authorization. All corporate action on the part of ABSC, its
                  officers, directors and stockholders necessary for the
                  authorization, issuance and delivery of the Shares pursuant to
                  Section 3 of this Agreement has been taken.

                                       16
<PAGE>   18
                  Valid Issuance of the Stock. The Shares, when delivered in
                  accordance with the terms herein, will be duly and validly
                  issued, fully paid and non-assessable, and will be free of any
                  liens and encumbrances.

         7.3.     Representations and Warranties of OSI.

                  As of the Effective Date OSI further represents and warrants
                  to ABSC:

                  Right to License or Sublicense. It owns all right, title and
                  interest in and to the Assay Patents and the Method of
                  Modulation Patents licensed or subject to being licensed or
                  sublicensed hereunder.

                  Patents. It has provided to ABSC a copy of each of the Assay
                  Patents and the Method of Modulation Patents issued or
                  pending. It has not granted, and during the term of this
                  Agreement will not grant, any right or interest in the Assay
                  Patents and the Method of Modulation Patents that is
                  inconsistent with the rights granted, or subject to being
                  granted, to ABSC or a Sublicensee herein. There are no
                  threatened or pending suits, claims, or proceedings including
                  interferences or opposition proceedings relating to the Assay
                  Patents and the Method of Modulation Patents, other than
                  normal patent prosecution proceedings. It does not own or hold
                  license rights to any patent or patent application not
                  included in Assay Patent and Method of Modulation Patents
                  which claims the same subject matter as that claimed therein.

                  Stock. OSI is obtaining the Shares for OSI's own account. OSI
                  has no present intention of distributing or selling said
                  Shares except as permitted under the Act. OSI is an
                  "accredited investor" as such term is defined in Rule 501
                  under the Act. OSI acknowledges and agrees the Shares may not
                  be sold, offered for sale, pledged, hypothecated or otherwise
                  transferred in the absence of an effective registration
                  statement under the Act with respect to such Shares or an
                  opinion of counsel reasonably acceptable to the Company that
                  such registration is not required.

         7.4.     Covenant Of OSI.

                  7.4.1.   OSI covenants not to sue ABSC and its Affiliates for
                           infringement of a claim of a Method of Modulation
                           Patent based upon any activity by ABSC or its
                           Affiliates prior to the date on which ABSC or an
                           Affiliate of ABSC commences good laboratory practice
                           preclinical development of a compound which affects a
                           Target; provided that ABSC and its Affiliates prior
                           to such date exercise the option pursuant to Section
                           2.3.1. and take a license under the Method of
                           Modulation Patents or discontinue all activity, in
                           either instance with respect to such Target.

                                       17
<PAGE>   19
                  7.4.2.   OSI covenants not to sue any Third Party to which
                           ABSC transfers Aurora Technology or an Aurora Assay
                           for infringement of a claim of an Assay Patent based
                           upon any activity by such Third Party with respect to
                           a Target prior to the date 60 days after such Third
                           Party commences a use of such Aurora Technology or
                           Aurora Assay which in the absence of a license under
                           the Assay Patent would constitute an infringement
                           thereof; provided that such Third Party prior to such
                           date obtains a license under the Assay Patents or
                           discontinues all otherwise infringing activity, in
                           each case with respect to such Target.

                  7.4.3.   OSI covenants not to sue any Third Party to which
                           ABSC has granted a sublicense under the Assay Patents
                           with respect to a Target pursuant to Section 2.2. for
                           infringement of a claim of a Method of Modulation
                           Patent based upon any activity by such Third Party
                           the date on which such Third Party commences good
                           laboratory practice preclinical development of a
                           compound which affects such Target; provided that
                           such Third Party prior to such date obtains a license
                           under the Method of Modulation Patents or
                           discontinues all activity, in either instance with
                           respect to such Target.

                  7.4.4.   If OSI should in the future acquire rights to any
                           patent which claims the same subject matter as that
                           claimed in the Assay Patents and the Method of
                           Modulation Patents, OSI covenants not to sue ABSC and
                           its Affiliates and Sublicensees for infringement of
                           such patent; provided that the licenses and
                           sublicenses granted pursuant to this Agreement are
                           then, and remain thereafter, in full force and
                           effect.

8.       CONFIDENTIALITY

         8.1.     Confidential Information. Except as expressly provided herein,
                  the parties agree that, for the Term and five (5) years
                  thereafter, the receiving party shall keep completely
                  confidential and shall not publish or otherwise disclose to
                  another party and shall not use for any purpose other than to
                  perform the purposes contemplated by this Agreement any
                  Confidential Information furnished to it by the disclosing
                  party hereto pursuant to this Agreement, except to the extent
                  that it can be established by the receiving party by competent
                  proof that such Confidential Information:

                  (i)      was already known to the receiving party, other than
                           under an obligation of confidentiality, at the time
                           of disclosure;
                  
                  (ii)     was generally available to the public or otherwise
                           part of the public domain at the time of its
                           disclosure to the receiving party;

                  (iii)    became generally available to the public or otherwise
                           part of the public domain after its disclosure and
                           other than through any act or omission of the
                           receiving party in breach of this Agreement;

                                       18
<PAGE>   20
                  (iv)     was lawfully disclosed to the receiving party by a
                           person other than a party hereto, or

                  (v)      was independently developed by the receiving party.

         8.2.     Permitted Use and Disclosures. Each party hereto may use or
                  disclose Confidential Information disclosed to it by the other
                  party to the extent such use or disclosure is reasonably
                  necessary in filing or prosecuting patent applications,
                  prosecuting or defending litigation, complying with applicable
                  law, governmental regulation or court order, submitting
                  information to tax or other governmental authorities, making a
                  permitted sublicense or otherwise exercising its rights
                  hereunder, provided that if a party is required to make any
                  such disclosure of another party's Confidential Information,
                  it will give reasonable advance notice to the latter party of
                  such disclosure and, save to the extent inappropriate in the
                  case of patent applications, will use reasonable efforts to
                  secure confidential treatment of such information prior to its
                  disclosure (whether through protective orders or otherwise).

         8.3.     Confidential Terms. Except as expressly provided herein, each
                  party agrees not to disclose any terms of this Agreement to
                  another party without the consent of the other party;
                  provided, however, each party reserves the right to make
                  reasonable disclosures as required by securities or other
                  applicable laws, or to actual or prospective investors or
                  corporate partners, or to accountants, attorneys and other
                  professional advisors on a need-to-know basis under
                  circumstances that reasonably ensure the confidentiality
                  thereof, or to the extent required by law. If such
                  Confidential Information is to become public information by
                  such disclosure the disclosing party must obtain the written
                  consent of the non-disclosing party in order to obtain
                  protection of the Confidential Information if necessary. The
                  parties agree that the terms of any sub-license for the Assay
                  Patents or The Methods of Modulation Patents to which ABSC is
                  a party shall be Confidential Information and shall not be
                  disclosed to any Third Party without the prior written consent
                  of ABSC, such consent not to be unreasonably withheld.

         8.4.     Press Release. Notwithstanding the foregoing, the parties
                  shall agree upon a press release to announce the execution of
                  this Agreement as set forth in Exhibit E. Thereafter, OSI and
                  ABSC may each disclose to Third Parties the information
                  contained in such press release without the need for further
                  approval by the other.

9.       TERM AND TERMINATION

         9.1.     This Agreement is effective as of the Effective Date and shall
                  continue in full force and effect on a country by country
                  basis until the last expiration date of all patents
                  encompassed within Assay Patents and Method of Modulation
                  Patents. ("Term").

                                       19
<PAGE>   21
         9.2.     Either party shall have the right to terminate this Agreement
                  at any time for a material breach of this Agreement by the
                  other party, provided that the nonbreaching party shall have
                  first given ninety (90) days prior written notice to the
                  breaching party describing such breach and stating the
                  nonbreaching party's intention to terminate this Agreement if
                  such breach remains uncured, and the breaching party
                  thereafter fails to cure such breach within such 90 days.

         9.3.     ABSC's obligation to make annual payments to OSI pursuant to
                  Section 3.1.2. shall continue until the expiration date of the
                  last Method of Modulation Patent to expire; provided that if
                  ABSC terminates its rights under Sections 2.3., 2.4. and 2.5.
                  pursuant to Section 5.1. ABSC's obligations to make such
                  payments shall cease following the date of any such
                  termination of rights by ABSC.

         9.4.     ABSC's obligation to make payments to OSI pursuant to Section
                  3.2. for each such sublicense shall commence upon the grant of
                  each sublicense granted under the Assay Patents to a Third
                  Party and shall continue until the earlier of the expiration
                  date of the last Assay Patent to expire or the termination of
                  such sublicense.

         9.5.     ABSC's obligation to make payments to OSI pursuant to Section
                  3.3., for each license granted pursuant to Section 2.3., shall
                  commence upon the grant of each such license granted to ABSC
                  for a specific Target under the Method of Modulation Patents
                  and shall continue until the expiration date of the last
                  Method of Modulation Patent to expire; provided that if ABSC
                  shall have terminated such license by giving OSI six months'
                  notice of termination and shall have discontinued all activity
                  with respect to such Target ABSC obligation to make payments
                  to OSI pursuant to Section 3.3. shall thereafter cease.

         9.6.     ABSC's obligation to make payments to OSI pursuant to Section
                  3.4., for each sublicense granted pursuant to Section 2.4.,
                  shall commence upon the grant of each such sublicense granted
                  by ABSC to a Sublicensee for a specific Target under the
                  Method of Modulation Patents and shall continue until the
                  earlier of the expiration date of the last Method of
                  Modulation Patent to expire or the termination of such
                  sublicense.

         9.7.     Termination of this Agreement shall not terminate either
                  party's obligations under Section 8, ABSC's obligations to pay
                  fees, royalties and sublicensing income that have accrued
                  prior to such termination or ABSC's obligations under Sections
                  4 and 10.3.

10.      MISCELLANEOUS

         10.1.    Binding Effect; Assignment. This Agreement shall be binding
                  upon the parties' respective successors and permitted assigns.
                  Neither party may assign this Agreement or any of its rights
                  or obligations hereunder without the prior written 


                                       20
<PAGE>   22
                  consent of the other party (not to be unreasonably withheld)
                  except that either party may assign this Agreement as part of
                  a merger or consolidation in which the surviving entity
                  assumes all of the party's rights and obligations hereunder or
                  a sale of substantially all of the assets of such party to
                  which this Agreement relates.

         10.2.    Effect of Waiver. No waiver of any default, condition,
                  provisions or breach of this Agreement shall be deemed to
                  imply or constitute a waiver of any other default, condition,
                  provision or breach of this Agreement.

         10.3.    Indemnification. Each of OSI and ABSC shall indemnify and hold
                  the other harmless with respect to any injury, loss or cost
                  resulting from the breach of any representation or warranty
                  provided pursuant to Section 7.0. Further, ABSC shall
                  indemnify and hold OSI harmless with respect to any injury,
                  loss or cost resulting from the clinical testing of compounds
                  and the manufacture, use or sale of Products by ABSC and its
                  Affiliates.

         10.4.    Force Majeure. Neither party shall lose any rights hereunder
                  or be liable to the other party for damages or losses (except
                  for payment obligations) on account of failure of performance
                  by the defaulting party if the failure is occasioned by war,
                  strike, fire, acts of God, earthquake, flood, lockout,
                  embargo, governmental acts or orders or restrictions, failure
                  of suppliers, or any other reason where failure to perform is
                  beyond the reasonable control and not caused by the negligence
                  or intentional conduct or misconduct of the nonperforming
                  party, and such party has exerted all reasonable efforts to
                  avoid or remedy such force majeure; provided, however, that in
                  no event shall a party be required to settle any labor dispute
                  or disturbance.

         10.5.    Amendment. No modification, supplement to or waiver of this
                  Agreement or any Addendum hereto or any of their provisions
                  shall be binding upon a party hereto unless made in writing
                  and duty signed by an authorized representative of both OSI
                  and ABSC.

         10.6.    Entire Agreement. This Agreement, including the Exhibits
                  attached hereto, sets forth the entire understanding and
                  agreement of the parties as to the subject matter hereof, and
                  there are no other understandings, representations or
                  promises, written or verbal, not set forth herein on which
                  either party has relied.

         10.7.    Notices. All Notices under this Agreement shall be given in
                  writing and shall be addressed to the parties at the following
                  addresses:

                           For OSI: OSI Pharmaceuticals, Inc.
                                    106 Charles Lindbergh Blvd.
                                    Uniondale, New York 11553
                                    Attn: President

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<PAGE>   23
                           For ABSC:        Aurora Biosciences Corporation
                                            11010 Torreyana Road
                                            San Diego, California 92121
                                            Attn: President

                  Notices shall be in writing and shall be deemed delivered when
                  received, if delivered by a courier, or on the second business
                  day following mailing, if sent by first-class certified or
                  registered mail, postage prepaid, and return receipt
                  requested.

         10.8.    Arbitration. The parties recognize that disputes as to certain
                  matters may from time to time arise during the term of this
                  Agreement which relate to either party's rights and/or
                  obligations hereunder. It is the objective of the parties to
                  establish procedures to facilitate the resolution of disputes
                  arising under this Agreement in an expedient manner by mutual
                  cooperation without resort to arbitration. The parties agree
                  that prior to any arbitration concerning this Agreement, OSI's
                  CEO and ABSC's CEO will meet in person or by
                  video-conferencing in a good faith effort to resolve any
                  disputes concerning this Agreement, such meeting to be held
                  within 30 days after notice is received by one party from the
                  other requesting such a meeting. Except as otherwise provided
                  specifically herein, any controversy or claim under this
                  Agreement except a claim as to the scope, validity or
                  enforcement of a claim of an Assay Patent or a Method of
                  Modulation Patent shall be settled solely by arbitration by
                  one arbitrator pursuant to the Commercial Arbitration Rules of
                  the American Arbitration Association (the "Association");
                  provided that the parties shall first have used their best
                  efforts to resolve such dispute by negotiation as set forth
                  above. ** The arbitrator shall be selected by the joint
                  agreement of the parties, but if they do not so agree within
                  twenty (20) days of the date of a request for arbitration, the
                  selection shall be made pursuant to the rules of the
                  Association. The decision reached by the arbitrator shall be
                  conclusive and binding upon the parties hereto and may be
                  filed with the clerk of any court of competent jurisdiction,
                  and a judgment confirming such decision may, if desired by any
                  party to the arbitration, be entered in such court. Each of
                  the parties shall pay its own expenses of arbitration and the
                  expenses of the arbitrator(s) shall be equally shared;
                  provided, however, that if in the opinion of the arbitrator(s)
                  any claim hereunder or any defense or objection thereto was
                  unreasonable, the arbitrator(s) may assess, as part of the
                  award, all or any part of the arbitration expenses (including
                  reasonable attorneys' fees) against the party raising such
                  unreasonable claim, defense or objection. Nothing herein set
                  forth shall prevent the parties from settling any dispute by
                  mutual agreement at any time.

                  10.9. Governing Law. This Agreement shall be governed by and
                  construed in accordance with the laws of the State of New
                  York, applicable to agreements 

__________

**   This portion has been redacted pursuant to a request for confidential 
     treatment.


                                       22
<PAGE>   24
                  made in New York without regard, or giving effect, to its
                  principles of conflict of laws.

         10.10.   Severability. This Agreement is intended to be severable. If
                  any provision(s) of this Agreement are or become invalid, are
                  ruled illegal by a court of competent jurisdiction or are
                  deemed unenforceable under the current applicable law from
                  time to time in effect during the term hereof, it is the
                  intention of the parties that the remainder of the Agreement
                  shall not be affected thereby and shall continue to be
                  construed to the maximum extent permitted by law at such time.
                  It is further the intention of the parties that in lieu of
                  each such provision which is invalid, illegal, or
                  unenforceable, there shall be substituted or added as part of
                  this Agreement by such court of competent jurisdiction a
                  provision which shall be as similar as possible in terms of
                  the economic and business objectives intended by the parties,
                  to such invalid, illegal or unenforceable provision, but shall
                  be valid, legal and enforceable.

         10.11.   Independent Contractors. The parties hereto are acting as
                  independent contractors and shall not be considered partners,
                  joint venturers or agents of the other. Except as expressly
                  provided herein, neither party shall have the right to act on
                  behalf of, or to bind, the other.

         10.12.   Headings. Captions and paragraph headings are for convenience
                  only and shall not form an interpretative part of this
                  Agreement. This Agreement shall not be strictly construed
                  against either party hereto and may be executed in two or more
                  counterparts, each of which will be deemed an original.


                                       23
<PAGE>   25
         IN WITNESS WHEREOF, the parties have executed this Agreement.



By: /s/  Colin Goddard, Ph.D.       Date:      22- May-98
   ---------------------------             -----------------
Colin Goddard, Ph.D.
President
For OSI Pharmaceuticals, Inc.


By: /s/ Paul A. Grayson             Date:     22 - May - 98
   ---------------------------             -----------------
Paul A. Grayson
Senior Vice President/Corporate Development
For Aurora Biosciences Corporation



                                       24
<PAGE>   26
                                    Exhibit A


U.S. Serial No.                 Status             Patent No. If Applicable

    **                            **                   **


- ------------------

**       This portion has been redacted pursuant to a request for confidential
         treatment.



                                       25
<PAGE>   27
                                    EXHIBIT B

                                  ASSAY PATENTS
                              SUBLICENSE AGREEMENT


This Agreement is made this _______ day of _______ (the "Effective Date"), by
and between Aurora Biosciences Corporation ("ABSC"), a Delaware corporation with
principal offices at 11010 Torreyana Road, San Diego, California 92121 and
___________________ ("Sublicensee"), a ________ corporation with principal
offices at__________________________________.

                                    RECITALS

WHEREAS, ABSC is a licensee under the Assay Patents defined herein, pursuant to
a License Agreement dated May ___, 1998 with OSI Pharmaceuticals, Inc. ("OSI"),
the assignee of the Assay Patents; and is willing to grant a sublicense under
such patents to Sublicensee; and

WHEREAS, Sublicensee wishes to obtain a sublicense from ABSC under the Assay
Patents, according to the terms contained herein;

Now, therefore, in consideration of the covenants and premises contained herein,
the parties agree as follows:

1.       DEFINITIONS

         1.1.     "Affiliate" means any corporation or other business entity
                  controlled by or under common control with, a party to this
                  Agreement. Control, as used in the context of a business
                  entity, means the ownership, directly or indirectly, of fifty
                  percent (50%), or greater, or the maximum interest permitted
                  by local law of the voting securities of the corporation or
                  other entity or a fifty percent (50%) or greater interest in
                  the income of such corporation or other entity or the ability
                  otherwise to manage the affairs of such corporation or other
                  entity.

         1.2.     "Assay Patents" means the U.S. patents and patent applications
                  listed on Exhibit A hereto, any patent applications filed
                  prior or subsequent to the Effective Date that claim the
                  benefit of the filing date of any patent application listed in
                  Exhibit A and any reissues, extensions, substitutions,
                  confirmations, re-registrations, re-examinations,
                  continuations, divisionals or continuations-in-part of the
                  foregoing patents and patent applications, as well as all
                  foreign counterparts thereof, to the extent that such patents
                  and patent applications are not Method of Modulation Patents.



                                       1
<PAGE>   28
         1.3.     "Aurora Assay" means **  .

         1.4.     "Aurora Technology" means all Technology owned or controlled
                  by ABSC which is not an Aurora Assay.

         1.5.     "Confidential Information" means all information received by
                  either party from the other party pursuant to this Agreement,
                  which is deemed confidential by the disclosing party and is
                  designated confidential at the time the information is
                  disclosed, subject to the exceptions set forth in Section 6.
                  1.

         1.6.     "Cosmeceuticals" means compounds, or assays for discovering
                  compounds, useful for (a) stimulation or control of hair
                  growth, (b) prevention or reversal of wrinkling of the skin,
                  or (c) alteration of skin or hair pigmentation, in each case
                  in human subjects.

         1.7.     "Intellectual Property" means any information and data which
                  is not generally known to the public, any new and useful
                  process, machine, manufacture, or composition of matter, or
                  improvement thereto, whether or not patentable, designs,
                  concepts, algorithms, formulae, software, techniques,
                  practices, processes, methods, knowledge, skill, experience,
                  expertise and technical information; copyrights; trade
                  secrets; or patent rights (including pending and issued patent
                  rights anywhere in the world).

         1.8.     "Materials" means any biological or chemical entity for
                  screening or assays, including reagents, cells, promoters,
                  enhancers, vectors, plasmids, proteins and fragments thereof,
                  peptides, antigens, antibodies, antagonists, agonists,
                  inhibitors, and chemicals.

         1.9.     "Method of Modulation Patents" means the U.S. patents and
                  patent applications listed on Exhibit A hereto, any patent
                  applications filed prior or subsequent to the Effective Date
                  that claim the benefit of the filing date of any patent
                  application listed in Exhibit A, and any reissues, extensions,
                  substitutions, confirmations, re-registrations,
                  re-examinations, continuations, divisionals or
                  continuations-in-part of the foregoing patents and patent
                  applications, as well as all foreign counterparts thereof, to
                  the extent such patents and patent applications claim an in
                  vivo method of modulation of a gene of interest or a
                  composition useful in such a method.

         1.10.    "Sub-Licensee" means the party so identified and first above
                  named.

         1.11.    "Target" means a specific gene.

         1.12.    "Technology" means Materials, Intellectual Property, or both.

- -----------------

**       This portion has been redacted pursuant to a request for confidential
         treatment.

                                       2
<PAGE>   29
         1.13.    "Term" has the meaning set forth in Section 7.1.1.

         1.14.    "Third Party" means any entity other than (i) ABSC and any of
                  its Affiliates and (ii) Sub-Licensee and any of its
                  Affiliates.

2.       SUBLICENSE

         2.1.     Sublicense Under the Assay Patents.

                  2.1.1.   Subject to any limitations as to the number and
                           identity of Targets pursuant to Section 2.1.2., ABSC
                           hereby grants to Sublicensee and its Affiliates, for
                           all fields except the field of specifically
                           discovering or developing Cosmeceuticals, a
                           nonexclusive, worldwide sublicense, without the right
                           to grant subsublicenses, under the Assay Patents (i)
                           to make or use any method, device or composition of
                           matter encompassed within, using or incorporating,
                           Aurora Technology or an Aurora Assay and (ii) to
                           make, use, have made, sell, offer for sale, import,
                           export, or otherwise exploit any compound which
                           results from the use of Aurora Technology or an
                           Aurora Assay by Sublicensee or an Affiliate of
                           Sublicensee; provided that such making, using, having
                           made, selling, offering for sale, importing,
                           exporting, or otherwise exploiting such compound
                           resulting from the use by Sublicensee or an Affiliate
                           of Sublicensee of Aurora Technology or an Aurora
                           Assay does not require a license under the Method of
                           Modulation Patents in which event a separate license
                           or sub-license under the Method of Modulation Patents
                           is required for which compensation will be due
                           pursuant to the terms of such separate license or
                           sub-license.

                           (ABSC MAY DELETE SECTION 2.1.2. IF NOT APPLICABLE ie.
                           WHEN THE SUB-LICENSE IS FOR AN UNLIMITED NUMBER OF
                           TARGETS)

                  2.1.2.   Sublicensee's sublicense granted pursuant to Section
                           2.1.1. shall be limited to the specific Target or
                           Targets set forth on Exhibit B hereto, which Targets
                           may be identified by code numbers.

                  2.1.3.   ABSC agrees that if in the future ABSC obtains rights
                           in the field of Cosmeceuticals because the field of
                           Cosmeceuticals ceases to be the subject of an
                           exclusive license grant by OSI to the Third Party
                           licensed as of the Effective Date of the License
                           Agreement between OSI and ABSC, the scope of
                           Sublicensee's nonexclusive sublicense under Section
                           2.1.1 shall be expanded to include Cosmeceuticals
                           without any additional consideration being provided
                           to ABSC by Sublicensee other than that already
                           provided for herein.

                                       3
<PAGE>   30
                  2.1.4.   ABSC shall within 30 days after entering into this
                           Agreement provide to OSI a copy thereof, provided,
                           however, that the specific Target(s) to which this
                           Agreement relates may be identified by code numbers
                           if the Sublicensee so desires.

3.       COMPENSATION

         3.1.     Compensation for Sublicense Under the Assay Patents.

                  (ABSC MAY DELETE WHICHEVER VERSION OF SECTION 3.1.1. IS NOT
                  APPLICABLE. MOREOVER, IN ADDITION TO THE PAYMENT SPECIFICALLY
                  PROVIDED FOR IN SECTION 3.1.1 ABSC MAY INCLUDE A PROVISION IN
                  THIS SECTION 3 FOR AN UPFRONT SUB-LICENSING FEE.)

                  3.1.1.   For each specific Target for which a sublicense is
                           granted by ABSC pursuant to Section 2.1.1. for the
                           limited number of Targets which are identified on
                           Exhibit B hereto, Sublicensee will pay to ABSC each
                           year commencing on the Effective Date of this
                           Agreement and on each anniversary date thereafter
                           that this Agreement is in effect, _________ Dollars
                           ($____________) per Target.

                  3.1.1    For each sublicense granted by ABSC under Section
                           2.1.1. for an unlimited number of Targets,
                           Sublicensee will pay to ABSC each year commencing on
                           the Effective Date of this Agreement, and on each
                           anniversary date thereafter that this Agreement is in
                           effect, _________ Dollars ($____________) per Target.

4.       PROTECTION AND MAINTENANCE OF PATENT RIGHTS

         4.1.     Sublicensee acknowledges and agrees that OSI shall have
                  complete control, at its expense and within its sole
                  discretion, over the prosecution, maintenance and enforcement
                  of the Assay Patents. ABSC directly or through OSI, will
                  provide Sublicensee with written updates on the status of the
                  prosecution of the Assay Patents at least once per year

5.       REPRESENTATIONS AND WARRANTIES

         5.1.     Representations and Warranties of ABSC and Sublicensee

                  As of the Effective Date each party hereby represents and
                  warrants:

                  Corporate Power. Such party is duly organized and validly
                  existing and in good standing under the laws of the state of
                  its incorporation and has all requisite 



                                       4
<PAGE>   31
                  corporate power and authority to enter into this Agreement and
                  to carry out the provisions hereof.

                  Due Authorization. Such party is duly authorized to execute
                  and deliver this Agreement and to perform its obligations
                  hereunder.

                  Binding Agreement. This Agreement is a legal and valid
                  obligation binding upon it and enforceable in accordance with
                  its terms. The execution, delivery and performance of this
                  Agreement by such party does not conflict with any agreement,
                  instrument or understanding, oral or written, to which it is a
                  party or by which it may be bound, nor violate any law or
                  regulation of any court, governmental body or administrative
                  or other agency having jurisdiction over it.

                  Patents. Each party acknowledges and agrees that nothing in
                  this Agreement shall be construed as a warranty or
                  representation (i) as to the validity of any claim of an Assay
                  Patent or (ii) that any activity by Sublicensee is, or will
                  be, free from infringement of patents of Third Parties.

         5.2.     Representations and Warranties of ABSC.

                  As of the Effective Date ABSC further represents and warrants
                  to Sublicensee that it has a license under the Assay Patents
                  and the right to grant the Sublicense being granted hereunder,
                  subject to Sublicensee's representations and warranties in
                  Section 5.3 being correct and valid.

         5.3.     Representations and Warranties of Sublicensee.

                  As of the Effective Date Sublicensee further represents and
                  warrants to ABSC and to OSI that neither Sublicensee nor any
                  Affiliate of Sublicensee commenced, more than 90 days prior to
                  the Effective Date of this Agreement, any use of Aurora
                  Technology or an Aurora Assay which, in the absence of this
                  Agreement, would have constituted an infringement of a claim
                  of an Assay Patent.

6.       CONFIDENTIALITY

         6.1.     Confidential Information. Except as expressly provided herein,
                  the parties agree that, for the Term and five (5) years
                  thereafter, the receiving party shall keep completely
                  confidential and shall not publish or otherwise disclose to
                  another party and shall not use for any purpose other than to
                  perform the purposes contemplated by this Agreement any
                  Confidential Information furnished to it by the disclosing
                  party hereto pursuant to this Agreement, except to the extent
                  that it can be established by the receiving party by competent
                  proof that such Confidential Information:

                                       5
<PAGE>   32
                  (i)      was already known to the receiving party, other than
                           under an obligation of confidentiality, at the time
                           of disclosure;

                  (ii)     was generally available to the public or otherwise
                           part of the public domain at the time of its
                           disclosure to the receiving party;

                  (iii)    became generally available to the public or otherwise
                           part of the public domain after its disclosure and
                           other than through any act or omission of the
                           receiving party in breach of this Agreement;

                  (iv)     was lawfully disclosed to the receiving party by a
                           person other than a party hereto, or

                  (v)      was independently developed by the receiving party.

         6.2.     Permitted Use and Disclosures. Each party hereto may use or
                  disclose Confidential Information disclosed to it by the other
                  party to the extent such use or disclosure is reasonably
                  necessary in filing or prosecuting patent applications,
                  prosecuting or defending litigation, complying with applicable
                  law, governmental regulation or court order, submitting
                  information to tax or other governmental authorities, making a
                  permitted sublicense or otherwise exercising its rights
                  hereunder, provided that if a party is required to make any
                  such disclosure of another party's Confidential Information,
                  it will give reasonable advance notice to the latter party of
                  such disclosure and, save to the extent inappropriate in the
                  case of patent applications, will use reasonable efforts to
                  secure confidential treatment of such information prior to its
                  disclosure (whether through protective orders or otherwise).

         6.3.     Confidential Terms. Except as expressly provided herein, each
                  party agrees not to disclose any terms of this Agreement to
                  another party other than OSI without the consent of the other
                  party; provided, however, each party reserves the right to
                  make reasonable disclosures as required by securities or other
                  applicable laws, or to actual or prospective investors or
                  corporate partners, or to accountants, attorneys and other
                  professional advisors on a need-to-know basis under
                  circumstances that reasonably ensure the confidentiality
                  thereof, or to the extent required by law. If such
                  Confidential Information is to become public information by
                  such disclosure the disclosing party must obtain the written
                  consent of the non-disclosing party in order to obtain
                  protection of the Confidential Information if necessary.

7.       TERM AND TERMINATION

         7.1.     Unless terminated earlier, this Agreement and Sublicensee's
                  obligations to make payments to ABSC pursuant to Section 3.1.
                  is effective as of the Effective Date and shall continue in
                  full force and effect on a country by country basis until the
                  last expiration date of all patents encompassed within the
                  Assay Patents ("Term").

         7.2.     Either party shall have the right to terminate this Agreement
                  at any time for a material breach of this Agreement by the
                  other party, provided that the 



                                       6
<PAGE>   33
                  nonbreaching party shall have first given ninety (90) days
                  prior written notice to the breaching party describing such
                  breach and stating the nonbreaching party's intention to
                  terminate this Agreement if such breach remains uncured, and
                  the breaching party thereafter fails to cure such breach
                  within such 90 days.

         7.3.     Sublicensee may terminate this Agreement by giving ABSC six
                  months' prior written notice of termination; provided that
                  Sublicensee shall not thereafter continue to develop, make,
                  use, have made, sell, offer for sale, import, export or
                  otherwise exploit any compound which results from a use of
                  Aurora Technology or an Aurora Assay by or on behalf of
                  Sublicensee or an Affiliate of Sublicensee and which is
                  directed against any Target embodied in such Aurora Technology
                  or Aurora Assay, if such use would in the absence of this
                  Agreement have constituted an infringement of a claim of an
                  Assay Patent. However, Sublicensee may independently develop
                  the same compound for a different Target.

         7.4.     Termination of this Agreement shall not terminate either
                  party's obligations under Section 6, Sublicensee's obligations
                  to pay fees under Section 3 that have accrued prior to such
                  termination or Sublicensee's obligations under Section 8.3.

8.       MISCELLANEOUS

         8.1.     Binding Effect: Assignment. This Agreement shall be binding
                  upon the parties' respective successors and permitted assigns.
                  Neither party may assign this Agreement or any of its rights
                  or obligations hereunder without the prior written consent of
                  the other party (not to be unreasonably withheld) except that
                  either party may assign this Agreement as part of a merger or
                  consolidation in which the surviving entity assumes all of the
                  party's rights and obligations hereunder or a sale of
                  substantially all of the assets of such party to which this
                  Agreement relates.

         8.2.     Effect of Waiver. No waiver of any default, condition,
                  provisions or breach of this Agreement shall be deemed to
                  imply or constitute a waiver of any other default, condition,
                  provision or breach of this Agreement.

         8.3.     Indemnification. Each of ABSC and Sublicensee shall indemnify
                  and hold the other and OSI harmless with respect to any
                  injury, loss or cost resulting from the breach of any
                  representation or warranty provided pursuant to Section 5.0.
                  Further, Sublicensee shall indemnify and hold ABSC and OSI
                  harmless with respect to any injury, loss or cost resulting
                  from the clinical testing of compounds, the manufacture, use
                  or sale of products by Sublicensee and its Affiliates, and any
                  other activity carried out pursuant to the right license
                  herein.

         8.4.     Force Majeure. Neither party shall lose any rights hereunder
                  nor be liable to the other party for damages or losses (except
                  for payment obligations) on account of failure of performance
                  by the defaulting party if the failure is occasioned by war,
                  strike, fire, acts of God, earthquake, flood, lockout,
                  embargo, governmental acts 



                                       7
<PAGE>   34
                  or orders or restrictions, failure of suppliers, or any other
                  reason where failure to perform is beyond the reasonable
                  control and not caused by the negligence or intentional
                  conduct or misconduct of the nonperforming party, and such
                  party has exerted all reasonable efforts to avoid or remedy
                  such force majeure; provided, however, that in no event shall
                  a party be required to settle any labor dispute or
                  disturbance.

         8.5.     Amendment. No modification, supplement to or waiver of this
                  Agreement or any Addendum hereto or any of their provisions
                  shall be binding upon a party hereto unless (i) made in
                  writing, (ii) duly signed by an authorized representative of
                  both ABSC and Sublicensee, and (iii) consented to by OSI, such
                  consent not to be unreasonably withheld.

         8.6.     Entire Agreement. This Agreement, including the Exhibits
                  attached hereto, sets forth the entire understanding and
                  agreement of the parties as to the subject matter hereof, and
                  there are no other understandings, representations, or
                  promises, written or verbal, not set forth herein or on which
                  either party has relied.

         8.7.     Notices. All notices under this Agreement shall be given in
                  writing and shall be addressed to the parties at the following
                  addresses:

                           For Sublicensee:



                           For ABSC:        Aurora Biosciences Corporation
                                            11010 Torreyana Road
                                            San Diego, California 92121
                                            Attn:  President


                  Copies of all notices shall be sent to OSI at the following
                  address:

                            OSI Pharmaceuticals, Inc.
                            106 Charles Lindbergh Blvd.
                            Uniondale, New York 1 1553

                            Attn:  President

                  Notices shall be in writing and shall be deemed delivered when
                  received, if delivered by a courier, or on the second business
                  day following mailing, if sent by first-class certified or
                  registered mail, postage prepaid, and return receipt
                  requested.

                                       8
<PAGE>   35
         8.8.     Arbitration. The parties recognize that disputes as to certain
                  matters may from time to time arise during the term of this
                  Agreement which relate to either party's rights and/or
                  obligations hereunder. It is the objective of the parties to
                  establish procedures to facilitate the resolution of disputes
                  arising under this Agreement in an expedient manner by mutual
                  cooperation without resort to arbitration. The parties agree
                  that prior to any arbitration concerning this Agreement,
                  ABSC's CEO and Sublicensees's CEO will meet in person or by
                  video-conferencing in a good faith effort to resolve any
                  disputes concerning this Agreement, such meeting to be held
                  within 30 days after notice is received by one party from the
                  other requesting such a meeting. Except as otherwise provided
                  specifically herein, any controversy or claim under this
                  Agreement except a claim as to the scope, validity or
                  enforcement of a claim of an Assay Patent or a Method of
                  Modulation Patent shall be settled solely by arbitration by
                  one arbitrator pursuant to the Commercial Arbitration Rules of
                  the American Arbitration Association (the "Association");
                  provided that the parties shall first have used their best
                  efforts to resolve such dispute by negotiation as set forth
                  above. The arbitration shall be conducted in **. The
                  arbitrator shall be selected by the joint agreement of the
                  parties, but if they do not so agree within twenty (20) days
                  of the date of a request for arbitration, the selection shall
                  be made pursuant to the rules of the Association. The decision
                  reached by the arbitrator shall be conclusive and binding upon
                  the parties hereto and may be filed with the clerk of any
                  court of competent jurisdiction, and a judgment confirming
                  such decision may, if desired by any party to the arbitration,
                  be entered in such court. Each of the parties shall pay its
                  own expenses of arbitration and the expenses of the
                  arbitrator(s) shall be equally shared, provided, however, that
                  if in the opinion of the arbitrator(s) any claim hereunder or
                  any defense or objection thereto was unreasonable, the
                  arbitrator(s) may assess, as part of the award, all or any
                  part of the arbitration expenses (including reasonable
                  attorneys' fees) against the party raising such unreasonable
                  claim, defense or objection. Nothing herein set forth shall
                  prevent the parties from settling any dispute by mutual
                  agreement at any time.

         8.9.     Governing Law. This Agreement shall be governed by and
                  construed in accordance with the laws of the State of New
                  York, applicable to agreements made in New York without
                  regard, or giving effect, to its principles of conflict of
                  laws.

         8.10.    Severability. This Agreement is intended to be severable. If
                  any provision(s) of this Agreement are or become invalid, are
                  ruled illegal by a court of competent jurisdiction or are
                  deemed unenforceable under the current applicable law from
                  time to time in effect during the term hereof, it is the
                  intention of the parties that the remainder of the Agreement
                  shall not be affected thereby and shall continue to be
                  construed to the maximum extent permitted by law at such time.
                  It is further the intention of the parties that in lieu of
                  each such provision which is invalid, illegal, or
                  unenforceable, there shall be substituted or added as part of
                  this Agreement by such court of competent jurisdiction a
                  provision which shall be as 
__________

**   This portion has been redacted pursuant to a request for confidential 
     treatment.



                                       9
<PAGE>   36
                  similar as possible in terms of the economic and business
                  objectives intended by the parties, to such invalid, illegal
                  or unenforceable provision, but shall be valid, legal and
                  enforceable.

         8.11.    Independent Contractors. The parties hereto are acting as
                  independent contractors and shall not be considered partners,
                  joint venturers or agents of the other. Neither party shall
                  have the right to act on behalf of, or to bind, the other.

         8.12.    Headings. Captions and paragraph headings are for convenience
                  only and shall not form an interpretative part of this
                  Agreement. This Agreement shall not be strictly construed
                  against either party hereto and may be executed in two or more
                  counterparts, each of which will be deemed an original.


                                       10
<PAGE>   37
         IN WITNESS WHEREOF, the parties have executed this Agreement.


 By:                                                  Date:
    -------------------------------            --------------------
Name:
Title:
For Sublicensee


 By:                                    Date:
    -------------------------------            --------------------

Timothy J. Rink M.D., Sc.D.
President, CEO and Chairman
For Aurora Biosciences Corporation


                                       11
<PAGE>   38
                                    EXHIBIT C

                              EXCLUDED OSI TARGETS



         **


- ------------------

**       This portion has been redacted pursuant to a request for confidential
         treatment.



                                       1
<PAGE>   39
                                    EXHIBIT D

                          METHOD OF MODULATION PATENTS
                              SUBLICENSE AGREEMENT



This Agreement is made this ______ day of _________ (the "Effective Date"), by
and between Aurora Biosciences Corporation ("ABSC"), a Delaware corporation with
principal offices at 11010 Torreyana Road, San Diego, California 92121 and
____________________ ("Sublicensee"), a _______ corporation with principal
offices at ____________________________.

                                    RECITALS

WHEREAS, ABSC is a licensee under the Method of Modulation Patents defined
herein, pursuant to a License Agreement dated May _, 1998 with OSI
Pharmaceuticals, Inc. ("OSI"), the assignee of the Method of Modulation Patents;
and is willing to grant a sublicense under such patents to Sublicensee; and

WHEREAS, Sublicensee wishes to obtain a sublicense from ABSC under the Method of
Modulation Patents, according to the terms contained herein;

Now, therefore, in consideration of the covenants and premises contained herein,
the parties agree as follows:

1.       DEFINITIONS

         1.1.     "Affiliate" means any corporation or other business entity
                  controlled by or under common control with, a party to this
                  Agreement. Control, as used in the context of a business
                  entity, means the ownership, directly or indirectly, of fifty
                  percent (50%), or greater, or the maximum interest permitted
                  by local law of the voting securities of the corporation or
                  other entity or a fifty percent (50%) or greater interest in
                  the income of such corporation or other entity or the ability
                  otherwise to manage the affairs of such corporation or other
                  entity.

         1.2.     "Assay Patents" means the U.S. patents and patent applications
                  listed on Exhibit A hereto, any patent applications filed
                  prior or subsequent to the Effective Date that claim the
                  benefit of the filing date of any patent application listed in
                  Exhibit A and any reissues, extensions, substitutions,
                  confirmations, re-registrations, re-examinations,
                  continuations, divisionals or continuations-in-part of the
                  foregoing patents and patent applications, as well as all
                  foreign counterparts thereof, to the extent that such patents
                  and patent applications are not Method of Modulation Patents.

                                       1
<PAGE>   40
         1.3.     "Aurora Assay" means  **  .

         1.4.     "Aurora Technology" means all Technology owned or controlled
                  by ABSC which is not an Aurora Assay.

         1.5.     "Confidential Information" means all information received by
                  either party from the other party pursuant to this Agreement,
                  which is deemed confidential by the disclosing party and is
                  designated confidential at the time the information is
                  disclosed, subject to the exceptions set forth in Section 7.1.

         1.6.     "Cosmeceuticals" means compounds, or assays for discovering
                  compounds, useful for (a) stimulation or control of hair
                  growth, (b) prevention or reversal of wrinkling of the skin,
                  or (c) alteration of skin or hair pigmentation, in each case
                  in human subjects.

         1.7.     "FDA" means the United States Food and Drug Administration, or
                  any successor agency having regulatory jurisdiction over the
                  manufacture, distribution and sale of drugs in the United
                  States or the equivalent agency in any other country.

         1.8.     "IND" means an Investigational New Drug application in the
                  United States or the equivalent application in any other
                  country.

         1.9.     "Intellectual Property" means any information and data which
                  is not generally known to the public, any new and useful
                  process, machine, manufacture, or composition of matter, or
                  improvement thereto, whether or not patentable, designs,
                  concepts, algorithms, formulae, software, techniques,
                  practices, processes, methods, knowledge, skill, experience,
                  expertise and technical information; copyrights; trade
                  secrets; or patent rights (including pending and issued patent
                  rights anywhere in the world).

         1.10.    "Materials" means any biological or chemical entity for
                  screening or assays, including reagents, cells, promoters,
                  enhancers, vectors, plasmids, proteins and fragments thereof,
                  peptides, antigens, antibodies, antagonists, agonists,
                  inhibitors, and chemicals.

         1.11.    "Method of Modulation Patents" means the U.S. patents and
                  patent applications listed on Exhibit A hereto, any patent
                  applications filed prior or subsequent to the Effective Date
                  that claim the benefit of the filing date of any patent
                  application listed in Exhibit A, and any reissues, extensions,
                  substitutions, confirmations, re-registrations,
                  re-examinations, continuations, divisionals or
                  continuations-in-part of the foregoing patents and patent
                  applications, as well as all foreign counterparts thereof, to
                  the extent such patents and patent applications claim an in
                  vivo method of modulation of a gene of interest or a
                  composition useful in such a method.


- ------------------ 

**       This portion has been redacted pursuant to a request for confidential
         treatment.

                                       2
<PAGE>   41
         1.12.    "NDA" means a New Drug Application or Product License
                  Application, as appropriate, in the United States or the
                  equivalent application in any other country.

         1.13.    "Net Sales" means the gross amounts actually received by
                  Sublicensee and its Affiliates and subsublicensees from arms'
                  length sales of Product(s) to Third Parties whether invoiced
                  or not, less:

                  (i)      Trade, quantity and cash discounts allowed;

                  (ii)     Refunds, rebates, chargebacks, retroactive price
                           adjustments, and any other allowances which
                           effectively reduce the net selling price and are
                           appropriately deducted from sales under generally
                           accepted accounting principles;

                  (iii)    Product returns and allowances;

                  (iv)     Any tax imposed on the Product that is appropriately
                           deducted from sales under generally accepted
                           accounting principles;

                  (v)      That portion of the amount received associated with
                           mechanical drug delivery devices; and

                  (vi)     Allowance for distribution expenses.

                  Such amounts shall be determined from the books and records of
                  Sublicensee and its Affiliates and subsublicensees, as
                  appropriate, maintained in accordance with generally accepted
                  accounting principles ("GAAP"), consistently applied.

                  In the event a Product is sold in combination with another
                  product(s), the Net Sales from the combination product, for
                  the purposes of determining royalty payments, shall be
                  determined by multiplying the Net Sales of the combination
                  product by the fraction, A/(A+B) where A is the average sale
                  price of the Product when sold separately and B is the average
                  sale price of the other product(s) when sold separately in
                  finished form. In the event that such average sale price
                  cannot be determined for either the Product or other
                  product(s) in such combination product, Net Sales for purposes
                  of determining royalty payments shall be calculated by
                  multiplying the Net Sales of the combination product by the
                  fraction C/(C+D) where C is the cost of manufacturing the
                  Product and D is the cost of manufacturing the other
                  product(s), determined in accordance with GAAP, consistently
                  applied.

         1.14.    "Product" means any human pharmaceutical product sold by
                  Sub-Licensees and/or its Affiliate and/or sub-sub-licensees to
                  a Third Party, the manufacture, use, importation or sale of
                  which in a specific country would in the absence of this
                  Agreement infringe an issued or granted claim in a Method of
                  Modulation Patent in such country and which was discovered or
                  developed by an activity which in

                                       3
<PAGE>   42
                  the absence of a license would infringe an issued or granted
                  claim in an Assay Patent.

         1.15.    "Sub-Licensee" means the party so identified and so above
                  named.

         1.16.    "Target" means a specific gene.

         1.17.    "Technology" means Materials, Intellectual Property, or both.

         1.18.    "Term" has the meaning set forth in Section 8.1.1.

         1.19.    "Third Party" means any entity other than (i) ABSC and any of
                  its Affiliates and (ii) Sublicensee and any of its Affiliates.

2.       SUBLICENSE

         2.1.     Sublicense Under the Methods of Modulation Patents.

                  2.1.1.   ABSC hereby grants to Sublicensee and its Affiliates,
                           for the specific Target listed in Exhibit B which is
                           neither (i) a Target for use in the field of
                           Cosmeceuticals which is excluded nor (ii) a Target
                           listed in Exhibit C, either as of the Effective Date
                           or within 12 months of the Effective Date, which also
                           is excluded, a non-exclusive, royalty-bearing,
                           worldwide license under the Method of Modulation
                           Patents to conduct research and development
                           concerning (but not to commercialize) one or more
                           compounds which are prospective Products directed
                           against such specific Target, and to make, use, have
                           made, sell, offer for sale, import, export, or
                           otherwise exploit any Product directed against such
                           specific Target, including treatment of humans with,
                           and in vivo administration for good laboratory
                           practice, preclinical development of, such
                           Products.

                  2.1.2.   ABSC shall within 30 days after entering into this
                           Agreement provide to OSI a copy thereof.


                                       4
<PAGE>   43
         2.2.     Right To Grant Subsublicenses Under The Method of Modulation
                  Patents.

                  2.2.1.   ABSC hereby grants Sublicensee the right to grant to
                           certain Third Parties and their Affiliates, for the
                           specific Target listed in Exhibit B a subsublicensee
                           under the Method of Modulation Patents to make, use,
                           have made, sell, offer for sale, import, export, or
                           otherwise exploit any Product directed against such
                           specific Target, including treatment of humans with,
                           and in vivo administration for good laboratory
                           practice pre-clinical development of, such products.

                  2.2.2.   Subsublicenses under Section 2.2.1. may be granted by
                           Sublicensee to any Third Party to which Sublicensee
                           has licensed or otherwise transferred its rights to
                           develop a Product directed against a specific Target
                           for which Sublicensee has a sublicense pursuant to
                           Section 2.1.1.; provided that Sublicensee's
                           obligations under this Agreement, including its
                           obligations under Section 3 shall continue and that
                           Sublicensee shall guarantee the performance by its
                           subsublicensee of all of subsublicensee's obligations
                           under any such subsublicense.

                  2.2.3.   Sublicensee shall within 30 days after entering into
                           any subsublicense under the Method of Modulation
                           Patents provide to ABSC and to OSI a copy thereof.

3.       COMPENSATION

         (ABSC, IN ADDITION TO THE PAYMENT SPECIFICALLY PROVIDED FOR IN THIS
         SECTION 3.1. MAY INCLUDE IN THIS SECTION 3 A PROVISION FOR AN UPFRONT
         SUB-LICENSING FEE.)

         3.1.     Compensation for Sublicenses Under the Method of Modulation
                  Patents.

                  3.1.1.   For the sublicenses granted to Sublicensee pursuant
                           to Section 2.1.1. for the specific Target listed in
                           Exhibit B Sublicensee will pay ABSC each year
                           commencing on the Effective Date of this Agreement
                           and on each anniversary date thereafter that such
                           sublicense is in effect, an annual license fee of
                           ________________ dollars ($_____ ).

                  3.1.2.   For the first Product directed against such Target
                           that reaches the following milestone events
                           Sublicensee will also pay ABSC within 30 days of such
                           milestone event the following amounts:


                                       5
<PAGE>   44
                                    Milestone Event              Payment  (US$)
                                    ---------------              -------  -----
                           i)  Upon filing an IND with the FDA         ________

                           ii) Upon acceptance of the filing of
                               an NDA by the FDA                       ________
                                    

                  3.1.3.   For such Target only one payment will be required for
                           each such milestone event regardless of the number of
                           Products directed against such Target for which
                           Sublicensee achieves such milestone events.

                  3.1.4.   For each Product directed against such Target
                           Sublicensee will also pay to ABSC a royalty of _____
                           percent (_%) of Net Sales of all such Products sold
                           by Sublicensee and its Affiliates and subsublicensees
                           on a country by country basis.

4.       ROYALTY PAYMENTS

         4.1.     Royalties payments due from Sublicensee to ABSC shall be paid
                  within sixty (60) days after the end of each calendar quarter
                  during which the royalty payment accrued. Each such payment
                  shall be accompanied by a statement certified by an officer of
                  Sublicensee with respect to each country indicating the amount
                  of the payment, the total Net Sales of each Product sold in
                  the country and the amount of royalty due.

         4.2.     To the extent that it is lawful and practicable to do so,
                  Sublicensee shall make all royalty payments required under
                  this Agreement in the United States of America in U.S.
                  Dollars. The royalty payments due on each sale made outside
                  the United States in a currency other than U.S. Dollars shall
                  be translated at the rate of exchange at which U.S. Dollars
                  are legally obtainable at Citibank, N.A. in New York, New
                  York, United States of America, for the currency of the
                  country in which the royalty payment is accrued on the last
                  business day of the calendar month in which the sale was made.
                  Sublicensee shall not be required to make any royalty payment
                  in contravention of the laws of any country, nor shall
                  Sublicensee be required to make the royalty payment in the
                  United States of America if Sublicensee is unable to recoup
                  the amount of such royalty or sublicense payment directly or
                  indirectly from the country in which the sales on which such
                  payment is based are made. In each country where the local
                  currency is blocked and cannot be removed from the country,
                  Sublicensee shall, at ABSC's request, pay the royalty payment
                  accrued in each such country to ABSC in local currency by
                  deposit to ABSC's account at a local bank designated by ABSC.

         4.3.     Sublicensee shall keep full and true books of account and
                  records of all sales of Product and Net Sales attributable to
                  sales by Sublicensee and its Affiliates and subsublicensees.
                  ABSC shall have the right, at ABSC's expense, through an
                  independent accountant reasonably approved by Sublicensee to
                  examine such 



                                       6
<PAGE>   45
                  books and records at any reasonable time during business hours
                  after notifying Sublicensee of its desire to do so. Such
                  examination shall be conducted no more often than once each
                  year and shall cover no more than the 3 preceding years. Such
                  independent accountant shall report only on the accuracy of
                  such books and records and the reports based thereon and shall
                  not disclose specific entries to ABSC.

5.       PROTECTION AND MAINTENANCE OF PATENT RIGHTS

         5.1.     Sublicensee acknowledges and agrees that OSI shall have
                  complete control, at its expense and within its sole
                  discretion, over the prosecution, maintenance and enforcement
                  of the Assay Patents and the Method of Modulation Patents.
                  ABSC directly, or through OSI, will provide Sublicensee with
                  written updates on the status of the prosecution of the Method
                  of Modulation Patents at least once per year.

6.       REPRESENTATIONS AND WARRANTIES

         6.1. Representations and Warranties of ABSC and Sublicensee.

                  As of the Effective Date each party hereby represents and
                  warrants:

                  Corporate Power. Such party is duly organized and validly
                  existing and in good standing under the laws of the state of
                  its incorporation and has all requisite corporate power and
                  authority to enter into this Agreement and to carry out the
                  provisions hereof.

                  Due Authorization. Such party is duly authorized to execute
                  and deliver this Agreement and to perform its obligations
                  hereunder.

                  Binding Agreement. This Agreement is a legal and valid
                  obligation binding upon it and enforceable in accordance with
                  its terms. The execution, delivery and performance of this
                  Agreement by such party does not conflict with any agreement,
                  instrument or understanding, oral or written, to which it is a
                  party or by which it may be bound, nor violate any law or
                  regulation of any court, governmental body or administrative
                  or other agency having jurisdiction over it.

                  Patents. Each party acknowledges and agrees that nothing in
                  this Agreement shall be construed as a warranty or
                  representation (i) as to the validity of any claim of a Method
                  of Modulation Patent or (ii) that any activity by Sublicensee
                  including the manufacture, use or sale of Product is, or will
                  be, free from infringement of patents of Third Parties.


                                       7
<PAGE>   46
         6.2.     Representations and Warranties of ABSC.

                  As of the Effective Date ABSC further represents and warrants
                  to Sublicensee that it has a license under the Method of
                  Modulation Patents and the right to grant the sublicense being
                  granted hereunder, subject to sub-licensees, representations
                  and warranties in Section 6.3 being correct and valid.

         6.3.     Representations and Warranties of Sublicensee.

                  As of the Effective Date Sublicensee further represents and
                  warrants to ABSC and to OSI that neither Sublicensee nor any
                  Affiliate of Sublicensee, prior to the Effective Date,
                  commenced good laboratory practice preclinical development of
                  a compound directed against such specific Target and which has
                  resulted from use of Aurora Technology or an Aurora Assay by
                  Sublicensee or an Affiliate of Sublicensee.

7.       CONFIDENTIALITY

         7.1.     Confidential Information. Except as expressly provided herein,
                  the parties agree that, for the Term and five (5) years
                  thereafter, the receiving party shall keep completely
                  confidential and shall not publish or otherwise disclose to
                  another party and shall not use for any purpose other than to
                  perform the purposes contemplated by this Agreement any
                  Confidential Information furnished to it by the disclosing
                  party hereto pursuant to this Agreement, except to the extent
                  that it can be established by the receiving party by competent
                  proof that such Confidential Information:

                  (i)      was already known to the receiving party, other than
                           under an obligation of confidentiality, at the time
                           of disclosure;

                  (ii)     was generally available to the public or otherwise
                           part of the public domain at the time of its
                           disclosure to the receiving party;

                  (iii)    became generally available to the public or otherwise
                           part of the public domain after its disclosure and
                           other than through any act or omission of the
                           receiving party in breach of this Agreement;

                  (iv)     was lawfully disclosed to the receiving party by a
                           person other than a party hereto, or

                  (v)      was independently developed by the receiving party.

         7.2.     Permitted Use and Disclosures. Each party hereto may use or
                  disclose Confidential Information disclosed to it by the other
                  party to the extent such use or disclosure is reasonably
                  necessary in filing or prosecuting patent applications,
                  prosecuting or defending litigation, complying with applicable
                  law, governmental regulation or court order, submitting
                  information to tax or other governmental authorities, making a
                  permitted sublicense or otherwise exercising its rights



                                       8
<PAGE>   47
                  hereunder, provided that if a party is required to make any
                  such disclosure of another party's Confidential Information,
                  it will give reasonable advance notice to the latter party of
                  such disclosure and, save to the extent inappropriate in the
                  case of patent applications, will use reasonable efforts to
                  secure confidential treatment of such information prior to its
                  disclosure (whether through protective orders or otherwise).

         7.3.     Confidential Terms. Except as expressly provided herein, each
                  party agrees not to disclose any terms of this Agreement to
                  another party other than OSI without the consent of the other
                  party; provided, however, each party reserves the right to
                  make reasonable disclosures as required by securities or other
                  applicable laws, or to actual or prospective investors or
                  corporate partners, or to accountants, attorneys and other
                  professional advisors on a need-to-know basis under
                  circumstances that reasonably ensure the confidentiality
                  thereof, or to the extent required by law. If such
                  Confidential information is to become public information by
                  such disclosure the disclosing party must obtain the written
                  consent of the non-disclosing party in order to obtain
                  protection of the Confidential Information if necessary.

8.       TERM AND TERMINATION

         8.1.1.   Unless terminated earlier, this Agreement and Sublicensee's
                  obligations to make payments to ABSC pursuant to Section 3.1.
                  is effective as of the Effective Date and shall continue in
                  full force and effect on a country by country basis until the
                  last expiration date of all patents encompassed within the
                  Method of Modulation Patents. ("Term").

         8.1.2.   Either party shall have the right to terminate this Agreement
                  at any time for a material breach of this Agreement by the
                  other party, provided that the nonbreaching party shall have
                  first given ninety (90) days prior written notice to the
                  breaching party describing such breach and stating the
                  nonbreaching party's intention to terminate this Agreement if
                  such breach remains uncured, and the breaching party
                  thereafter fails to cure such breach within such (90) days.

         8.1.3.   Sublicensee may terminate this Agreement by giving ABSC six
                  months' prior written notice of termination.

         8.1.4.   Termination of this Agreement shall not terminate either
                  party's obligations under Section 7, Sublicensee's obligations
                  to pay fees and royalties that have accrued under Section 3
                  prior to such termination or Sublicensee's obligations under
                  Section 9.3.


                                       9
<PAGE>   48
9.       MISCELLANEOUS

         9.1.     Binding Effect: Assignment. This Agreement shall be binding
                  upon the parties' respective successors and permitted assigns.
                  Neither party may assign this Agreement or any of its rights
                  or obligations hereunder without the prior written consent of
                  the other party (not to be unreasonably withheld) except that
                  either party may assign this Agreement as part of a merger or
                  consolidation in which the surviving entity assumes all of the
                  party's rights and obligations hereunder or a sale of
                  substantially all of the assets of such party to which this
                  Agreement relates.

         9.2.     Effect of Waiver. No waiver of any default, condition,
                  provisions or breach of this Agreement shall be deemed to
                  imply or constitute a waiver of any other default, condition,
                  provision or breach of this Agreement.

         9.3.     Indemnification. Each of ABSC and Sublicensee shall indemnify
                  and hold the other harmless with respect to any injury, loss
                  or cost resulting from the breach of any representation or
                  warranty provided pursuant to Section 6. Further, Sublicensee
                  shall indemnify and hold ABSC and OSI harmless with respect to
                  any injury, loss or cost resulting from the clinical testing
                  of compounds, the manufacture, use or sale of Products by
                  Sublicensee and its Affiliates and subsublicensees, and any
                  other activity carried out pursuant to the rights licensed
                  herein.

         9.4.     Force Majeure. Neither party shall lose any rights hereunder
                  or be liable to the other party for damages or losses (except
                  for payment obligations) on account of failure of performance
                  by the defaulting party if the failure is occasioned by war,
                  strike, fire, acts of God, earthquake, flood, lockout,
                  embargo, governmental acts or orders or restrictions, failure
                  of suppliers, or any other reason where failure to perform is
                  beyond the reasonable control and not caused by the negligence
                  or intentional conduct or misconduct of the nonperforming
                  party, and such party has exerted all reasonable efforts to
                  avoid or remedy such force majeure; provided, however, that in
                  no event shall a party be required to settle any labor dispute
                  or disturbance.

         9.5.     Amendment. No modification, supplement to or waiver of this
                  Agreement or any Addendum hereto or any of their provisions
                  shall be binding upon a party hereto unless (i) made in
                  writing, (ii) duly signed by an authorized representative of
                  both ABSC and Sublicensee, and (iii) consented to by OSI, such
                  consent not to be unreasonably withheld.

         9.6.     Entire Agreement. This Agreement, including the Exhibits
                  attached hereto, sets forth the entire understanding and
                  agreement of the parties as to the subject matter hereof, and
                  there are no other understandings, representations or
                  promises, written or verbal, not set forth herein or on which
                  either party has relied.

                                       10
<PAGE>   49
         9.7.     Notices. All notices under this Agreement shall be given in
                  writing and shall be addressed to
                  the parties at the following addresses:

                  For Sublicensee:



                  For OSI:          OSI Pharmaceuticals, Inc.
                                    106 Charles Lindbergh Blvd.
                                    Uniondale, New York 11553
                                    Attn:  President

                  For ABSC:         Aurora Biosciences Corporation
                                    11010 Torreyana Road
                                    San Diego, California 92121
                                    Attn:  President

                  Copies of all notices sent by ABSC or Sublicensee shall be
                  sent to OSI.

                  Notices shall be in writing and shall be deemed delivered when
                  received, if delivered by a courier, or on the second business
                  day following mailing, if sent by first-class certified or
                  registered mail, postage prepaid, and return receipt
                  requested.

         9.8.     Arbitration. The parties recognize that disputes as to certain
                  matters may from time to time arise during the term of this
                  Agreement which relate to either party's rights and/or
                  obligations hereunder. It is the objective of the parties to
                  establish procedures to facilitate the resolution of disputes
                  arising under this Agreement in an expedient manner by mutual
                  cooperation without resort to arbitration. The parties agree
                  that prior to any arbitration concerning this Agreement,
                  ABSC's CEO and Sublicensee's CEO will meet in person or by
                  video-conferencing in a good faith effort to resolve any
                  disputes concerning this Agreement, such meeting to be held
                  within 30 days after notice is received by one party from the
                  other requesting such a meeting. Except as otherwise provided
                  specifically herein, any controversy or claim under this
                  Agreement except a claim as to the scope, validity or
                  enforcement of a claim of an Assay Patent or a Method of
                  Modulation Patent shall be settled solely by arbitration by
                  one arbitrator pursuant to the Commercial Arbitration Rules of
                  the American Arbitration Association (the "Association");
                  provided that the parties shall first have used their best
                  efforts to resolve such dispute by negotiation as set forth
                  above. The arbitration shall be conducted in ** The arbitrator
                  shall be selected by the joint agreement of the parties, but
                  if they do not so agree within twenty (20) days of the date of
                  a request for arbitration, the selection shall be made
                  pursuant to the rules of the Association. The decision reached
                  by the arbitrator shall be conclusive and binding upon the
                  parties hereto and may be filed with the clerk of any court of
__________

**   This portion has been redacted pursuant to a request for confidential 
     treatment.



                                       11
<PAGE>   50
                  competent jurisdiction, and a judgment confirming such
                  decision may, if desired by any party to the arbitration, be
                  entered in such court. Each of the parties shall pay its own
                  expenses of arbitration and the expenses of the arbitrator(s)
                  shall be equally shared; provided, however, that if in the
                  opinion of the arbitrator(s) any claim hereunder or any
                  defense or objection thereto was unreasonable, the
                  arbitrator(s) may assess, as part of the award, all or any
                  part of the arbitration expenses (including reasonable
                  attorneys' fees) against the party raising such unreasonable
                  claim, defense or objection. Nothing herein set forth shall
                  prevent the parties from settling any dispute by mutual
                  agreement at any time.

         9.9.     Governing Law. This Agreement shall be governed by and
                  construed in accordance with the laws of the State of New
                  York, applicable to agreements made in New York without
                  regard, or giving effect, to its principles of conflict of
                  laws.

         9.10.    Severability. This Agreement is intended to be severable. If
                  any provision(s) of this Agreement are or become invalid, are
                  ruled illegal by a court of competent jurisdiction or are
                  deemed unenforceable under the current applicable law from
                  time to time in effect during the term hereof, it is the
                  intention of the parties that the remainder of the Agreement
                  shall not be affected thereby and shall continue to be
                  construed to the maximum extent permitted by law at such time.
                  It is further the intention of the parties that in lieu of
                  each such provision which is invalid, illegal, or
                  unenforceable, there shall be substituted or added as part of
                  this Agreement by such court of competent jurisdiction a
                  provision which shall be as similar as possible in terms of
                  the economic and business objectives intended by the parties,
                  to such invalid, illegal or unenforceable provision, but shall
                  be valid, legal and enforceable.

         9.11.    Independent Contractors. The parties hereto are acting as
                  independent contractors and shall not be considered partners,
                  joint venturers or agents of the other. Neither party shall
                  have the right to act on behalf of, or to bind, the other.

         9.12.    Headings. Captions and paragraph headings are for convenience
                  only and shall not form an interpretative part of this
                  Agreement. This Agreement shall not be strictly construed
                  against either party hereto and maybe executed in two or more
                  counterparts, each of which will be deemed an original.


                                       12
<PAGE>   51
         IN WITNESS WHEREOF, the parties have executed this Agreement.

By:                                              Date:
   ---------------------------------                  -----------------------
Name:
Title:
For Sublicensee


By:                                              Date:
   ---------------------------------                  -----------------------

Timothy J. Rink M.D., Sc.D.
President, CEO and Chairman
For Aurora Biosciences Corporation


                                       13


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