SUGEN INC
10-Q/A, 1996-10-24
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549
                          -----------------------------

   
                                    FORM 10-Q/A
    
(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, 1996.
           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:
                                     0-24814
                          -----------------------------

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

          Delaware                                           13-3629196
(State or other jurisdiction of                          (I.R.S. Employer
 incorporation or organization)                          Identification No.)


               515 Galveston Drive, Redwood City, California 94063
                    (address of principal executive offices)


                                 (415) 306-7700
              (Registrant's telephone number, including area code)


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


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 filing requirements
for the past 90 days. Yes  X   No
                         -----   -----

Indicate the number of shares  outstanding  of each of the  issuer's  classes of
common stock, as of the latest  practicable  date.  Common Stock $.01 par value;
10,543,057 shares outstanding at July 31, 1996.


   
This report on form 10-Q/A,  including  all  exhibits,  contains ___ pages.  The
exhibit index is located on page 14 of this report.
    


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                                        1
<PAGE>

                                EXPLANATORY NOTE

This Form 10-Q/A is being filed solely for the purpose of amending Exhibit 10.51
to the Quarterly  Report on Form 10-Q for the  quarterly  period ending June 30,
1996.



                                       2

<PAGE>

                                   SUGEN, Inc.

                                      INDEX

                                                                        PAGE NO.
                                                                        --------

PART II. OTHER INFORMATION

Item 6.  Exhibits and Reports on Form 8-K                                  4


Signatures                                                                 5


Exhibit Index                                                              6

Exhibit

                                        3


<PAGE>

                           PART II. OTHER INFORMATION


Item 6.           EXHIBITS AND REPORTS ON FORM 8-K

(a)      Exhibits

Exhibit Number                      Description

   
       10.51*       Cooperative  Research and Development  Agreement between the
                    Registrant and the National  Cancer  Institute,  dated April
                    12, 1996.
    

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

   
       *            The  Registrant  has requested confidential  treatment  with
                    respect to portions of this Exhibit.
    

(b)      Reports on Form 8-K

         No  reports on Form 8-K were filed  during the  quarter  ended June 30,
1996.




                                        4
<PAGE>

                                   SUGEN, Inc.

                                   SIGNATURES



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



Date:       October 24, 1996                 SUGEN, Inc.




By:      /s/ Christine E. Gray-Smith       By:      /s/ Christine E. Gray-Smith
     -------------------------------            -------------------------------
     Christine E. Gray-Smith                    Christine E. Gray-Smith        
     Senior Director of Finance                 Senior Director of Finance     
     (Principal Financial and                   (Principal Financial and       
        Accounting Officer)                        Accounting Officer)         
                                                                               
                                               





                                       5
<PAGE>

                                   SUGEN, Inc.

                                  EXHIBIT INDEX



Exhibit No.               Description                        Page in Form 10-Q/A


   
    10.51*    Cooperative Research and Development Agreement
              between the Registrant and the National Cancer
              Institute, dated April 12, 1996.
    

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

   

     *        The Registrant has requested  confidential  treatment with respect
              to portions of this Exhibit.
    





                                       6



          CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT,
    MARKED BY BRACKETS, IS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION
   PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED.


                          EXHIBIT 10.51

                     Cooperative Research and
                      Development Agreement

                           (CACR-0345)

   
Characterization  of  the  NCI  Cancer  Screening  Panel  Regarding  RTK/TK  and
Phosphatase Expression Status and Profiling of NCI and SUGEN Leads
    

                        Dr. George Johnson

                               DTP
                              DCTDC


                         Dr. Peter Hirth
                           SUGEN, Inc.



                           Prepared by
                 Office of Technology Development
                    National Cancer Institute


<PAGE>

                                                 

                              PUBLIC HEALTH SERVICE

                 COOPERATIVE RESEARCH AND DEVELOPMENT AGREEMENT

This Cooperative Research and Development Agreement, hereinafter referred to as
the "CRADA," consists of this Cover Page, an attached Agreement, a Signature
Page and various Appendices referenced in the Agreement. This Cover Page serves
to identify the Parties to this CRADA:

         (1) the following Bureau(s), Institute(s),  Center(s) or Division(s) of
the National  Institutes  of Health  ("NIH"),  the Food and Drug  Administration
("FDA"),  and the Centers for Disease Control and Prevention  ("CDC"):  National
Cancer Institute,  hereinafter singly or collectively  referred to as the Public
Health Service ("PHS"); and

         (2) SUGEN,  Inc.,  which has offices at 515  Galveston  Drive,  Redwood
City, CA 94063, hereinafter referred to as the "Collaborator."



Although  drafted for two Parties,  the attached  CRADA also may be used for any
number. This Cover Page,  however,  should be modified by repeating block (2) to
identify  other  Parties to the  CRADA.  All  non-PHS  Parties  are  hereinafter
collectively referred to as the "Collaborator." Use of the terms "Collaborator,"
"Party," and "Parties"  should be construed as appropriate for the actual number
of CRADA participants.


<PAGE>

                                                 


                 COOPERATIVE RESEARCH AND DEVELOPMENT AGREEMENT

Article 1.        Introduction

This Cooperative Research and Development  Agreement (CRADA) between PHS and the
Collaborator  will be  effective  when signed by all  Parties.  The research and
development  activities  which will be  undertaken by each of the Parties in the
course of this CRADA are detailed in the Research Plan (RP) which is attached as
Appendix A. The funding and staffing commitments of the Parties are set forth in
Appendix B. Any exceptions or changes to the CRADA are set forth in Appendix C.

Article 2.  Definitions

As used in this CRADA, the following terms shall have the indicated meanings:

2.1      "Cooperative Research and Development Agreement" or "CRADA" means this
         Agreement, entered into by PHS pursuant to the Federal Technology
         Transfer Act of 1986, as amended, 15 U.S.C. 3710a et seq. and Executive
         Order 12591 of October 10, 1987.

2.2      "Government" means the Government of the United States as represented
         through the PHS agency that is a Party to this agreement.

2.3      "Invention"  means  any  invention  or  discovery  which  is or  may be
         patentable or otherwise  protected  under title 35, United States Code,
         or any novel variety or plant which is or may be protectable  under the
         Plant Variety Protection Act (7 U.S.C. 2321 et seq.).

2.4      "Principal  Investigator(s)"  or "PIs"  means  the  persons  designated
         respectively  by the Parties to this CRADA who will be responsible  for
         the scientific and technical conduct of the RP.

2.5      "Proprietary/Confidential Information" means confidential scientific,
         business, or financial information provided that such information does
         not include:

         2.5.1    information  that is publicly  known or  available  from other
                  sources who are not under a confidentiality  obligation to the
                  source of the information;

         2.5.2    information  which has been made  available  by its  owners to
                  others without a confidentiality obligation;

         2.5.3    information  which is  already  known by or  available  to the
                  receiving Party without a confidentiality obligation; or

                                      -2-

<PAGE>

                                                CONFIDENTIAL TREATMENT REQUESTED


         2.5.4    information  which relates to potential  hazards or cautionary
                  warnings  associated with the  production,  handling or use of
                  the subject matter of the Research Plan of this CRADA.

2.6      "Research License" shall mean a nontransferable,  nonexclusive  license
         under any IP license to make and use a licensed  invention for purposes
         of  research  and  not  for  purposes  of  commercial   manufacture  or
         distribution or in lieu of purchase.

2.7      "Research  Materials"  means all tangible  materials other than Subject
         Data first produced in the performance of this CRADA.

2.8      "Research  Plan" or "RP"  means  the  statement  in  Appendix  A of the
         respective research and development  commitments of the Parties to this
         CRADA.

2.9      "Subject  Invention"  means any Invention of the Parties,  conceived or
         first actually  reduced to practice in the  performance of the Research
         Plan of this CRADA.

2.10     "Subject  Data" means all recorded  information  first  produced in the
         performance  of this CRADA by the Parties.

Article 3.       Cooperative Research

3.1      Principal  Investigators.  PHS  research  work under this CRADA will be
         performed  by the PHS  laboratory  identified  in the  RP,  and the PHS
         Principal  Investigator  (PI)  designated in the RP will be responsible
         for the scientific  and technical  conduct of this project on behalf of
         PHS.  Also  designated  in the RP is the  Collaborator  PI who  will be
         responsible for the scientific and technical conduct of this project on
         behalf of the Collaborator.

3.2      Research Plan Change.  The RP may be modified by mutual written consent
         of the Principal Investigators. Substantial changes in the scope of the
         RP will be treated as amendments under Article 13.6.

Article 4.       Reports

4.1      Interim  Reports.  The Parties shall exchange  formal  written  interim
         progress  reports  on a  schedule  agreed  to by the PIs,  but at least
         within  [REDACTED]  after this  CRADA  becomes  effective  and at least
         within every  [REDACTED]  thereafter.  Such reports shall set forth the
         technical  progress  made,  identifying  such problems as may have been
         encountered and  establishing  goals and objectives  requiring  further
         effort, any modifications to the Research Plan pursuant to Article 3.2,
         and all CRADA- related patent applications filed.

4.2      Final  Reports.  The Parties  shall  exchange  formal  reports of their
         results within  [REDACTED] after  completing the projects  described in
         the RP or after the expiration or termination of this CRADA.

                                      -3-

<PAGE>

                                                CONFIDENTIAL TREATMENT REQUESTED



Article 5.            Financial and Staffing Obligations

5.1      PHS and Collaborator  Contributions.  The contributions of the Parties,
         including payment schedules,  if applicable,  are set forth in Appendix
         B. PHS shall not be obligated to perform any of the research  specified
         herein  or to take  any  other  action  required  by this  CRADA if the
         funding is not  provided as set forth in  Appendix B. PHS shall  return
         excess funds to the Collaborator  when it sends its final fiscal report
         pursuant  to Article  5.2,  except for  staffing  support  pursuant  to
         Article 10.3.  Collaborator  acknowledges that the U.S. Government will
         have the  authority  to retain and  expend  any excess  funds for up to
         [REDACTED]  subsequent to the expiration or termination of the CRADA to
         cover any costs  incurred  during the term of the CRADA in  undertaking
         the work set forth in the RP.

5.2      Accounting  Records.  PHS shall maintain  separate and distinct current
         accounts,  records,  and other evidence  supporting all its obligations
         under this CRADA,  and shall  provide the  Collaborator  a final fiscal
         report pursuant to Article 4.2.

5.3      Capital  Equipment.  Equipment  purchased by PHS with funds provided by
         the  Collaborator  shall be the property of PHS. All capital  equipment
         provided  under this  CRADA by one party for the use of  another  Party
         remains the property of the providing Party unless other disposition is
         mutually  agreed  upon by in writing by the  Parties.  If title to this
         equipment  remains with the providing Party,  that Party is responsible
         for maintenance of the equipment and the costs of its transportation to
         and from the site where it will be used.

Article 6.            Intellectual Property Rights and Patent Applications

6.1      Reporting.  The Parties shall promptly  report to each other in writing
         each Subject Invention resulting from the research conducted under this
         CRADA that is  reported  to them by their  respective  employees.  Each
         Party  shall  report  all  Subject  Inventions  to the  other  Party in
         sufficient  detail to determine  inventorship.  Such  reports  shall be
         treated as  Proprietary/Confidential  Information  in  accordance  with
         Article 8.4.

6.2      Collaborator Employee Inventions. If the Collaborator does not elect to
         retain its IP rights,  the Collaborator  shall offer to assign these IP
         rights to the Subject  Invention to PHS pursuant to Article 6.5. If PHS
         declines such assignment, the Collaborator may release its IP rights as
         it may determine.

6.3      PHS Employee Inventions. PHS on behalf of the U.S. Government may elect
         to  retain  IP rights to each.  Subject  Invention  made  solely by PHS
         employees.  If PHS does not elect to retain IP rights,  PHS shall offer
         to assign these IP rights to such Subject Invention to the Collaborator
         pursuant to Article 6.5. If the Collaborator  declines such assignment,
         PHS may release IP rights in such  Subject  Invention  to its  employee
         inventors pursuant to Article 6.6.

                                      -4-


<PAGE>

                                            


6.4      Joint  Inventions.  Each  Subject  Invention  made  jointly  by PHS and
         Collaborator   employees   shall  be  jointly  owned  by  PHS  and  the
         Collaborator.  The  Collaborator  may elect to file the joint patent or
         other IP  application(s)  thereon and shall  notify PHS  promptly  upon
         making  this  election.  If  the  Collaborator  decides  to  file  such
         applications, it shall do so in a timely manner and at its own expense.
         If the Collaborator does not elect to file such application(s),  PHS on
         behalf of the U.S.  Government  shall  have the right to file the joint
         application(s)  in a timely  manner and at its own  expense.  If either
         Party  decides not to retain its IP rights to a jointly  owned  Subject
         Invention,  it shall  offer to assign  such  rights to the other  Party
         pursuant to Article 6.5. If the other Party  declines such  assignment,
         the  offering  Party may  release its IP rights as provided in Articles
         6.2, 6.3, and 6.6.

6.5      Filing of Patent Applications.  With respect to Subject Inventions made
         by the Collaborator as described in Article 6.2, or by PHS as described
         in  Article  6.3,  a Party  exercising  its right to elect to retain IP
         rights  to a  Subject  Invention  agrees  to file  patent  or  other IP
         applications  in a  timely  manner  and at its own  expense  and  after
         consultation  with the other  Party.  The Party shall  notify the other
         Party of its  decision  regarding  filing in  countries  other than the
         United  States  in a timely  manner.  The Party may elect not to file a
         patent or other IP  application  thereon in any  particular  country or
         countries provided it so advises the other Party ninety (90) days prior
         to the expiration of any applicable filing deadline, priority period or
         statutory bar date, and hereby agrees to assign its IP right, title and
         interest in such country or  countries to the Subject  Invention to the
         other Party and to cooperate in the  preparation and filing of a patent
         or other IP applications.  In any countries in which title to patent or
         other IP rights is transferred to the  Collaborator,  the  Collaborator
         agrees that PHS inventors will share in any royalty  distribution  that
         the Collaborator pays to its own inventors.

6.6      Release to Inventors. In the event neither of the Parties to this CRADA
         elects to file a patent or other IP application on a Subject Invention,
         either or both (if a joint  invention)  may retain or release  their IP
         rights in accordance  with their  respective  policies and  procedures.
         However, the Government shall retain a nonexclusive, non-transferrable,
         irrevocable,   royalty-free   license  to  practice  any  such  Subject
         Invention or have it practiced throughout the world.

6.7      Patent  Expenses.  The  expenses  attendant  to the filing of patent or
         other IP applications  generally shall be paid by the Party filing such
         application.  If an  exclusive  license  to any  Subject  Invention  is
         granted to the Collaborator,  the Collaborator shall be responsible for
         all past and  future  out-of-pocket  expenses  in  connection  with the
         preparation,  filing,  prosecution and maintenance of any  applications
         claiming such exclusively-licensed  inventions and any patents or other
         IP grants that may issue on such  applications.  The  Collaborator  may
         waive its exclusive license rights on any application,  patent or other
         IP grant at any time, and incur no subsequent  compensation  obligation
         for that application, patent or IP grant.

6.8      Prosecution of Intellectual Property Applications.  Within one month of
         receipt or filing, each Party shall provide the other Party with copies
         of the applications  and all 

                                      -5-


<PAGE>

                                                CONFIDENTIAL TREATMENT REQUESTED


         documents  received from or filed with the relevant  patent or other IP
         office in connection  with the prosecution of such  applications.  Each
         Party shall also  provide the other Party with the power to inspect and
         make  copies  of all  documents  retained  in the  patent  or  other IP
         application  files by the applicable  patent or other IP office.  Where
         licensing is contemplated by Collaborator, the Parties agree to consult
         with each other with respect to the prosecution of applications for PHS
         Subject   Inventions   described  in  Article  6.3  and  joint  Subject
         Inventions described in Article 6.4. If the Collaborator elects to file
         and prosecute IP applications on joint Subject  Inventions  pursuant to
         Article 6.4, PHS will be granted an associate power of attorney (or its
         equivalent) on such IP applications.

Article 7.  Licensing

7.1      Option for  Commercialization  License.  With respect to  Government IP
         rights to any Subject  Invention not made solely by the  Collaborator's
         employees  for which a patent  or other IP  application  is filed,  PHS
         hereby  grants to the  Collaborator  an option to elect an exclusive or
         nonexclusive  commercialization  license, which is substantially in the
         form of the appropriate model PHS license  agreement.  This option does
         not apply to Subject  Inventions  conceived prior to the effective date
         of this CRADA if PHS has filed a patent  application  on the  invention
         and has  licensed  it or offered to  license it to a third  party.  The
         terms of the license will fairly  reflect the nature of the  invention,
         the  relative  contributions  of the Parties to the  invention  and the
         CRADA,  the  risks  incurred  by the  Collaborator  and  the  costs  of
         subsequent  research and  development  needed to bring the invention to
         the marketplace.

7.2      Exercise of License Option. The option of Article 7.1 must be exercised
         by written notice mailed within [REDACTED] after collaborator  receives
         written  notice  that the  patent  or other IP  application  is  filed.
         Exercise of this  option by the  Collaborator  initiates a  negotiation
         period that expires [REDACTED] after the patent or other IP application
         filing  date.  If the last  proposal by the  Collaborator  has not been
         responded  to in writing  by PHS within  this  [REDACTED]  period,  the
         negotiation  period shall be extended to expire [REDACTED] after PHS so
         responds,  during [REDACTED] the Collaborator may accept in writing the
         final license proposal of PHS. In the absence of such  acceptance,  PHS
         will be free to license such IP rights to others. In the event that the
         Collaborator  elects the option for an exclusive  license,  but no such
         license is executed  during the negotiation  period,  PHS agrees not to
         make an offer for an  exclusive  license on more  favorable  terms to a
         third  party  for  a  period  of  [REDACTED]   without  first  offering
         Collaborator [REDACTED.]

7.3      Government  Intellectual  Property  Rights.  For  inventions  developed
         wholly by PHS investigators or jointly with a Collaborator,  under this
         CRADA,  pursuant to Articles 6.3 and 6.4, PHS retains,  pursuant to the
         Federal  Technology  Transfer  Act of 1986,  as  amended, 15 U.S.C. ss.
         3710a(b)(2), a nonexclusive,  irrevocable,  paid-up license to practice
         the invention or to have the invention  practiced  throughout the world
         by or on behalf of the U.S. Government. The PHS also reserves the right
         under any  exclusive  IP license to  require  Collaborator  to grant on
         reasonable terms a Research License to third parties.


                                      -6-


<PAGE>

                                                CONFIDENTIAL TREATMENT REQUESTED


7.4      Research  Licenses.  For inventions  developed  wholly by  Collaborator
         under this CRADA,  pursuant to Article 6.2, the Collaborator  agrees to
         grant the  Government  a Research  License,  as defined in Article 2.6,
         which shall be [REDACTED.]

7.5      Joint  Inventions  Not  Exclusively  Licensed.  In the  event  that the
         Collaborator does not acquire an exclusive commercialization license to
         IP  rights in all  fields  in joint  Subject  Inventions  described  in
         Article  6.4,  then each  Party  shall  have the right to use the joint
         Subject  Invention  and to license  its use to others in all fields not
         exclusively licensed to Collaborator.  The Parties may agree to a joint
         licensing approach for such IP rights.

Article 8.  Proprietary Rights and Publication

8.1      Right of Access. PHS and the Collaborator agree to exchange all Subject
         Data  produced  in the course of  research  under this  CRADA,  whether
         developed  solely by PHS or  jointly  with the  Collaborator.  Research
         Materials  will be shared  equally by the  Parties to the CRADA  unless
         other  disposition  is agreed to by the  Parties.  All  Parties to this
         CRADA will be free to utilize  Subject Data and Research  Materials for
         their own purposes, consistent with their obligations under this CRADA.

8.2      Ownership  of  Subject  Data and  Research  Materials.  Subject  to the
         sharing  requirements  of  Paragraph  8.1  and  the  regulatory  filing
         requirements   of  Paragraph  8.3,  the  producing  Party  will  retain
         ownership of and title to all Subject Inventions,  all Subject Data and
         all Research Materials produced solely by their investigators.  Jointly
         developed Subject Inventions,  Subject Data and Research Materials will
         be jointly owned.

8.3      Dissemination  of Subject  Data and Research  Materials.  To the extent
         allowed  under law, the  Collaborator  and PHS agree to use  reasonable
         efforts to keep Subject Data and Research Materials  confidential until
         published or until  corresponding  patent  applications  are filed. Any
         information  that would identify human subjects of research or patients
         will always be maintained  confidentially.  Collaborator shall have the
         exclusive  right to use any and all CRADA  Subject  Data in and for any
         regulatory  filing  by or on behalf of  Collaborator,  except  that PHS
         shall have the  exclusive  right to use Subject Data for that  purpose,
         and  authorize  others  to do so,  if the  CRADA  is  terminated  or if
         Collaborator abandons its commercialization efforts.

8.4      Proprietary/Confidential  Information.  Each Party  agrees to limit its
         disclosure  of  Proprietary/Confidential   Information  to  the  amount
         necessary to carry out the Research Plan of this CRADA, and shall place
         a  confidentiality  notice on all such  information.  Confidential oral
         communications    shall   be   [REDACTED.]    Each   Party    receiving
         Proprietary/Confidential  Information  agrees that any  information  so
         designated  shall be used by it only for the purposes  described in the
         attached  Research  Plan.  Any Party may object to the  designation  of
         information  as  Proprietary/Confidential  Information by another Party
         and may decline to accept such  information.  Subject Data and Research
         Materials  developed  solely by the  Collaborator  may be designated as
         Proprietary/Confidential Information when they are wholly

                                      -7-


<PAGE>

                                                 


         separable  from the  Subject  Data  and  Research  Materials  developed
         jointly with PHS  investigators,  and advance  designation of such data
         and material  categories  is set forth in the RP. The exchange of other
         confidential  information,  e.g.,  patient-identifying  data, should be
         similarly  limited and  treated.  Jointly  developed  Subject  Data and
         Research  Material  derived from the Research  Plan may be disclosed by
         Collaborator to a third party under a confidentiality agreement for the
         purpose of possible  sublicensing  pursuant to the Licensing  Agreement
         and subject to Article 8.7.

8.5      Protection       of        Proprietary/Confidential        Information.
         Proprietary/Confidential  Information  shall not be disclosed,  copied,
         reproduced  or otherwise  made  available to any other person or entity
         without the consent of the owning Party except as required  under court
         order or the Freedom of Information  Act (5 U.S.C. ss. 552). Each Party
         agrees to use its best  efforts  to  maintain  the  confidentiality  of
         Proprietary/Confidential  Information. Each Party agrees that the other
         Party is not  liable  for the  disclosure  of  Proprietary/Confidential
         Information  which, after notice to and consultation with the concerned
         Party,  the other Party in possession  of the  Proprietary/Confidential
         Information  determines  may not be  lawfully  withheld,  provided  the
         concerned  Party has been given an  opportunity to obtain a court order
         to enjoin disclosure.

8.6      Duration of Confidentiality  Obligation. The obligation to maintain the
         confidentiality of Proprietary/Confidential Information shall expire at
         the earlier of the date when the  information is no longer  Proprietary
         Information  as  defined in  Article  2.5 or three (3) years  after the
         expiration or  termination  date of this CRADA.  The  Collaborator  may
         request  an   extension   to  this  term  when   necessary  to  protect
         Proprietary/Confidential  Information  relating  to  products  not  yet
         commercialized.

8.7      Publication.  The Parties are encouraged to make publicly available the
         results  of their  research.  Before  either  Party  submits a paper or
         abstract  for  publication  or otherwise  intends to publicly  disclose
         information  about  a  Subject  Invention,  Subject  Data  or  Research
         Materials, the other Party shall be provided thirty (30) days to review
         the   proposed    publication    or    disclosure    to   assure   that
         Proprietary/Confidential  Information is protected.  The publication or
         other disclosure shall be delayed for up to thirty (30) additional days
         upon  written  request by any Party as  necessary  to preserve  U.S. or
         foreign patent or other IP rights.

Article 9.  Representations and Warranties

9.1      Representations  and  Warranties  of PHS.  PHS  hereby  represents  and
         warrants to the  Collaborator  that the official signing this CRADA has
         authority to do so.

9.2      Representations and Warranties of the Collaborator.

         (a) The  Collaborator  hereby  represents  and warrants to PHS that the
         Collaborator  has the requisite  power and authority to enter into this
         CRADA  and  to  perform   according   to  its   terms,   and  that  the
         Collaborator's  official signing this CRADA has authority to do 

                                      -8-


<PAGE>

                                                CONFIDENTIAL TREATMENT REQUESTED


         so. The Collaborator  further represents that it is financially able to
         satisfy any funding commitments made in Appendix B.

         (b) The  Collaborator  certifies that the  statements  herein are true,
         complete,  and accurate to the best of its knowledge.  The Collaborator
         is aware that any false, fictitious, or fraudulent statements or claims
         may subject it to criminal, civil, or administrative penalties.

Article 10.  Termination

10.1     Termination By Mutual Consent.  PHS and the  Collaborator may terminate
         this CRADA, or portions thereof, at any time by mutual written consent.
         In  such  event  the  Parties  shall  specify  the  disposition  of all
         property, inventions, patent or other IP applications and other results
         of work  accomplished  or in progress,  arising from or performed under
         this CRADA,  all in accordance  with the rights  granted to the Parties
         under the Terms of this Agreement.

10.2     Unilateral Termination. Either PHS or the Collaborator may unilaterally
         terminate  this entire  CRADA at any time by giving  written  notice at
         least thirty (30) days prior to the desired  termination  date, and any
         rights  accrued  in  property,  patents  or  other IP  rights  shall be
         disposed of as provided in paragraph 10.1.

   
10.3     Staffing. If this CRADA is mutually or unilaterally terminated prior to
         its expiration,  funds will  nevertheless  remain  available to PHS for
         continuing any staffing  commitment  made by  Collaborator  pursuant to
         Article  5.1  above  and  Appendix  B, if  applicable,  for a period of
         [REDACTED] after such termination.  If there are insufficient  funds to
         cover this expense, [REDACTED].
    

10.4     New  Commitments.  No Party shall make new commitments  related to this
         CRADA after a mutual termination or notice of a unilateral  termination
         and shall, to the extent feasible,  cancel all outstanding  commitments
         and contracts by the termination date.

10.5     Termination  Costs.  Concurrently  with the  exchange of final  reports
         pursuant to Articles 4.2 and 5.2, PHS shall submit to the  Collaborator
         for  payment a  statement  of all costs  incurred  prior to the date of
         termination and for all reasonable termination costs including the cost
         of returning  Collaborator  property or removal of abandoned  property,
         for which Collaborator shall be responsible.

Article 11.  Disputes

11.1     Settlement.  Any dispute arising under this CRADA which is not disposed
         of by  agreement  of the  Principal  Investigators  shall be  submitted
         jointly to the signatories of this CRADA. If the signatories are unable
         to  jointly   resolve  the  dispute   within  thirty  (30)  days  after
         notification  thereof,  the Assistant  Secretary for Health (or his/her
         designee or  successor)  shall  propose a  resolution.  Nothing in this
         Article shall prevent any Party

                                      -9-


<PAGE>

                                                


         from  pursuing  any  additional  administrative  remedies  that  may be
         available  and,  after  exhaustion  of  such  administrative  remedies,
         pursuing all available judicial remedies.

11.2     Continuation  of Work.  Pending the  resolution of any dispute or claim
         pursuant to this  Article,  the Parties agree that  performance  of all
         obligations  shall  be  pursued   diligently  in  accordance  with  the
         direction of the PHS signatory.

Article 12.  Liability

12.1     Property.  The U.S.  Government shall not be responsible for damages to
         any Collaborator  property provided to PHS, where Collaborator  retains
         title to the property, or any property acquired by Collaborator for its
         own use pursuant to this CRADA.

12.2     NO WARRANTIES. EXCEPT AS SPECIFICALLY STATED IN ARTICLE 10, THE PARTIES
         MAKE NO  EXPRESS  OR  IMPLIED  WARRANTY  AS TO ANY  MATTER  WHATSOEVER,
         INCLUDING  THE  CONDITIONS OF THE RESEARCH OR ANY INVENTION OR PRODUCT,
         WHETHER TANGIBLE OR INTANGIBLE, MADE, OR DEVELOPED UNDER THIS CRADA, OR
         THE OWNERSHIP,  MERCHANTABILITY, OR FITNESS FOR A PARTICULAR PURPOSE OF
         THE RESEARCH OR ANY INVENTION OR PRODUCT.

12.3     Indemnification.  The Collaborator  agrees to hold the U.S.  Government
         harmless and to indemnify the Government for all liabilities,  demands,
         damages, expenses and losses arising out of the use by the Collaborator
         for any purpose of the Subject Data,  Research Materials and/or Subject
         Inventions produced in whole or part by PHS employees under this CRADA,
         unless  due to  the  negligence  or  willful  misconduct  of  PHS,  its
         employees,  or agents.  The Collaborator shall be liable for any claims
         or  damages  it  incurs  in  connection  with  this  CRADA.  PHS has no
         authority to indemnify the Collaborator.

12.4     Force  Majeure.  Neither  Party  shall be liable for any  unforeseeable
         event  beyond  its  reasonable  control  not  caused  by the  fault  or
         negligence  of such  Party,  which  causes  such  Party to be unable to
         perform its obligations  under this CRADA, and which it has been unable
         to  overcome  by the  exercise  of due  diligence.  In the event of the
         occurrence of such a force majeure  event,  the Party unable to perform
         shall  promptly  notify the other Party.  It shall further use its best
         efforts to resume  performance as quickly as possible and shall suspend
         performance only for such period of time as is necessary as a result of
         the force majeure event.

Article 13.  Miscellaneous

13.1     Governing Law. The  construction,  validity,  performance and effect of
         this CRADA shall be governed by Federal  law, as applied by the Federal
         Courts in the District of Columbia.  Federal law and  regulations  will
         preempt any conflicting or inconsistent provisions in this CRADA.

                                      -10-


<PAGE>

                                           


13.2     Entire  Agreement.  This CRADA constitutes the entire agreement between
         the Parties  concerning the subject matter of this CRADA and supersedes
         any prior understanding or written or oral agreement.

13.3     Headings.  Titles and headings of the articles and  subarticles of this
         CRADA are for  convenient  reference  only,  do not form a part of this
         CRADA, and shall in no way affect its interpretation.

13.4     Waivers.  None of the  provisions  of this  CRADA  shall be  considered
         waived by any Party unless such waiver is given in writing to the other
         Party. The failure of a Party to insist upon strict  performance of any
         of the terms and conditions hereof, or failure or delay to exercise any
         rights  provided  herein or by law, shall not be deemed a waiver of any
         rights of any Party.

13.5     Severability.  The  illegality or invalidity of any  provisions of this
         CRADA shall not impair,  affect,  or invalidate the other provisions of
         this CRADA.

13.6     Amendments.  If either Party desires a modification to this CRADA,  the
         Parties shall, upon reasonable  notice of the proposed  modification or
         extension  by the Party  desiring  the change,  confer in good faith to
         determine the  desirability  of such  modification  or extension.  Such
         modification shall not be effective until a written amendment is signed
         by the  signatories  to this  CRADA  or by their  representatives  duly
         authorized to execute such amendment.

13.7     Assignment.  Neither  this CRADA nor any rights or  obligations  of any
         Party  hereunder  shall be assigned or otherwise  transferred by either
         Party without the prior written consent of the other Party.

13.8     Notices.  All notices  pertaining to or required by this CRADA shall be
         in  writing  and shall be signed by an  authorized  representative  and
         shall be delivered by hand or sent by certified  mail,  return  receipt
         requested,  with postage  prepaid,  to the  addresses  indicated on the
         signature  page for each  Party.  Notices  regarding  the  exercise  of
         license  options  shall be made  pursuant to Article 7.2. Any Party may
         change  such  address by notice  given to the other Party in the manner
         set forth above.

13.9     Independent Contractors.  The relationship of the Parties to this CRADA
         is that of independent  contractors  and not as agents of each other or
         as joint  venturers or  partners.  Each Party shall  maintain  sole and
         exclusive  control  over its  personnel  and  operations.  Collaborator
         employees who will be working at PHS  facilities may be asked to sign a
         Guest Researcher or Special Volunteer Agreement  appropriately modified
         in view of the terms of this CRADA.

13.10    Use of Name or Endorsements.  By entering into this CRADA, PHS does not
         directly or indirectly  endorse any product or service provided,  or to
         be  provided,  whether  directly or  indirectly  related to either this
         CRADA  or to  any  patent  or  other  IP  license  or  agreement  which
         implements this CRADA by its successors,  assignees, or licensees.  The

                                      -11-


<PAGE>

                                           


         Collaborator  shall not in any way state or imply that this CRADA is an
         endorsement  of any such product or service by the U.S.  Government  or
         any of its organizational units or employees. Collaborator issued press
         releases  that  reference or rely upon the work of PHS under this CRADA
         shall be made available to PHS at least 7 days prior to publication for
         review and comment.

13.11    Exceptions to this CRADA. Any exceptions or modifications to this CRADA
         that are  agreed to by the  Parties  prior to their  execution  of this
         CRADA are set forth in Appendix C.

13.12    Reasonable  Consent.  Whenever  a  Party's  consent  or  permission  is
         required  under this CRADA,  such  consent or  permission  shall not be
         unreasonably withheld.

Article 14.  Duration of Agreement

14.1     Duration.  It is mutually  recognized that the duration of this project
         cannot be rigidly defined in advance,  and that the  contemplated  time
         periods  for  various  phases of the RP are only good faith  guidelines
         subject to adjustment by mutual  agreement to fit  circumstances as the
         RP proceeds.  In no case will the term of this CRADA extend  beyond the
         term  indicated  in the RP  unless it is  revised  in  accordance  with
         Article 13.6.

14.2     Survivability.  The  provisions of Articles 4.2,  5-8,10.3-10.5,  11.1,
         12.2-12.4,  13.1,  13.10 and 14.2 shall survive the termination of this
         CRADA.

                                      -12-


<PAGE>

                                          



NIH/ADAMHA Patent Policy Board                                       CACR - 0345



                              CRADA SIGNATURE PAGE


FOR NIH:



/s/ Alan S. Rabson                                          4/11/96
- ------------------------------------------------            --------------------
Alan S. Rabson, M.D.                                        Date
Deputy Director, NCI

Mailing Address for Notices:

National Cancer Institute
Office of Technology Development
9000 Rockville Pike
Building 31, Room 4A51
Bethesda, Maryland 20892


FOR THE COLLABORATOR:  (The undersigned  expressly certifies or affirms that the
contents of  any statements  made or reflected in this document are truthful and
accurate.)




/s/ James L. Tyree                                            4/12/96
- ------------------------------------------------            --------------------
Mr. James L. Tyree                                             Date
President

Mailing Address for Notices:

SUGEN, Inc.

515 Galveston Drive

Redwood City, CA 94063

                                       S-1


<PAGE>

                                                



                                   APPENDIX A

                                  RESEARCH PLAN

   
TITLE OF CRADA:  Characterization  of the NCI Cancer  Screening  Panel Regarding
RTK/TK and Phosphatase Expression Status and Profiling of NCI and SUGEN Leads
    

PHS PRINCIPAL INVESTIGATOR: Dr. George Johnson, DTP, DCTDC, NCI

his/her Laboratory: Developmental Therapeutics Program, NCI

COLLABORATOR PRINCIPAL INVESTIGATOR: Dr. Peter Hirth

   
TERM OF CRADA: Three (3) years.
    

The Research  Plan which  follows this page should be concise but of  sufficient
detail to permit reviewers of this CRADA to evaluate the scientific merit of the
proposed  collaboration.  The RP should explain the scientific importance of the
collaboration and the research goals of PHS and the Collaborator. The respective
contributions  in  terms  of  expertise  and/or  research  materials  of PHS and
Collaborator should be summarized.  Initial and subsequent projects contemplated
under the RP, and the time periods  estimated  for their  completion,  should be
described  and pertinent  methodological  considerations  summarized.  Pertinent
literature references may be cited and additional relevant information included.
Include  additional  pages to identify the Principal  Investigators of all other
Parties to this CRADA.


                                      -14-


<PAGE>

   
                                                
                                   APPENDIX A

                                  RESEARCH PLAN

                                 NCI CRADA # 345

                                 Title of CRADA

               Characterization of the NCI Cancer Screening Panel
              Regarding RTK / TK and Phosphatase Expression Status
                 and Profiling of NCI and SUGEN Lead Structures


                           NIH PRINCIPAL INVESTIGATOR
                               Dr. George Johnson
                 Developmental Therapeutics Program, DCTDC, NCI


                       Collaborator Principal Investigator
                                 Dr. Peter Hirth
                                   SUGEN, Inc.


                                  Term of CRADA
                                Three (3) years.

        A Letter of Intent (LOI) for this CRADA was executed between the
                          Parties on December 11, 1995.


                          Research Goals of this CRADA

The  proposed  Cooperative  Research  and  Development  Agreement  (CRADA)  will
encompass a joint  collaborative  research effort on the parts of NCI and SUGEN,
Inc. in the projects as detailed below. The general  description of the research
project  will be molecular  target  characterization  of NCI's cancer  screening
panel  (Project 1) followed by  screening  and  profiling  of both NCI and SUGEN
compounds in each Party's  respective  screening assays (Projects 2 and 3). Lead
compound(s) identified through these collaborative efforts may be the subject of
a formally  executed and mutually  agreeable  written  amendment to the executed
CRADA for further  preclinical testing possibly leading to human clinical trials
(Project 4).

<PAGE>

                                                CONFIDENTIAL TREATMENT REQUESTED

Appendix A - Confidential                                              CRADA 345
NCI/SUGEN

                      Overview and Objectives of This CRADA

                                    PROJECT 1

Overview

o    The  Parties  will  collaborate  on the  characterization  of NCI's  cancer
     screening  panel of sixty selected tumor cell lines  regarding the RTK / TK
     and specific phosphatase expression status. The scope of the CRADA Research
     Plan is defined by the  [REDACTED]  attached as pages A-5 and A-6 below and
     will be modifiable after execution of the CRADA only by written amendment.

o    Under this CRADA,  SUGEN is designated as the exclusive  collaborator  with
     NCI for the  characterization of the NCI cancer screening panel with regard
     to the  designated  molecular  target  assays.  Accordingly,  NCI  will not
     collaborate  with  any  other  commercial   entity  related  to  [REDACTED]
     designated.  The Developmental Therapeutics Program has selected this level
     of exclusivity to best address the interests of both Parties:  the interest
     of the Program to pursue other unrelated and non-redundant assays which may
     provide additional important data and [REDACTED] and the interests of SUGEN
     in securing an exclusive collaborative  relationship during the term of the
     CRADA.

o    Transfers of the cancer panels for [REDACTED] to any non-commercial  entity
     will  be  for  research  purposes  only  and  will  not be  subject  to any
     obligations  of any  commercial  entity.  SUGEN  will  be  notified  of any
     non-commercial   research   requests  and,   through  NCI,  will  have  the
     opportunity  to approach  the  non-commercial  entity in order to negotiate
     future intellectual property option arrangements. Additionally, at the time
     of transfer,  DTP will notify the non-commercial entity of the existence of
     this  CRADA  and the  obligations  of NCI.  While  SUGEN  will not have the
     opportunity to disapprove any transfers by NCI to a non-commercial  entity,
     any  serious  reservations  regarding  the  [REDACTED]  will be taken  into
     consideration by NCI as a factor for the  appropriateness of the [REDACTED]
     to the non-commercial  entity (in light of any potential conflicts with the
     goals of this CRADA)  prior to NCI making a final  decision  regarding  the
     transfer.

o    NCI's  computer  screening  database  will be searched for  compounds  with
     cytotoxicity profiles which correlate with expression profiles.

o    SUGEN will perform  verification  testing of the open listed (see Project 2
     Overview) correlates against the molecular target.


                                      A-2
<PAGE>
                                                CONFIDENTIAL TREATMENT REQUESTED

Appendix A - Confidential                                              CRADA 345
NCI/SUGEN


Objectives

o    With this information,  the Collaborators will learn if the NCI tumor panel
     contains many of the recently  discovered  dominant  mechanisms  underlying
     cancer growth.

o    The  results  from  obtaining  this  information  could  be the  [REDACTED]
     information  to help evaluate  [REDACTED]  data stored in the NCI databases
     and  SUGEN  would  be able to  adopt  (through  CRADA  amendment(s)  and/or
     licensing  if  necessary)  NCI  leads  as part of  SUGEN's  Drug  Discovery
     Program.

Resources

o    NCI will provide cell lines to SUGEN.

o    SUGEN will perform  transcript imaging of "targets" at the expected expense
     of [REDACTED] per 1 year.

o    SUGEN and NCI will jointly  develop query software and code for pattern and
     data analysis.

                                    PROJECT 2

Overview

o    SUGEN's [REDACTED] from SUGEN's screening program will be profiled in NCI's
     tumor cell line panel.

o    NCI's computer  screening  database will be searched for  [REDACTED]  which
     best match that of the lead structure. [REDACTED]

o    SUGEN will perform  verification testing of the SUGEN compounds against the
     target.

Objectives

o    The profiling of SUGEN's [leads] in NCI's [REDACTED] could identify utility
     in different cancer indications.

o    The screening  results  might help SUGEN to test certain  [REDACTED] in the
     appropriate  preclinical models and in the case of more advance [REDACTED],
     to include certain [REDACTED] in Phase II / III studies.


                                      A-3
<PAGE>

                                                CONFIDENTIAL TREATMENT REQUESTED

Appendix A - Confidential                                              CRADA 345
NCI/SUGEN


o    From the search of NCI's computer database,  [REDACTED] could be identified
     for development.

Resources

o    SUGEN will provide  compounds with a synthesis cost estimated at [REDACTED]
     per year.

o    NCI will test compounds in cell panel.

o    NCI will analyze  cytotoxicity  database and provide available  correlating
     compounds to SUGEN for verification testing.

                                    PROJECT 3

Overview

o    Compounds  selected from NCI's open  repository  (See Project 2 definition)
     will be screened against SUGEN's primary screening assays.

Objectives

o    SUGEN would have increased access to small molecules for inclusion into its
     screen as well as increase the diversity for [REDACTED].

o    More  specifically,  it is  anticipated  that  selection  and  providing of
     compounds  under  this  Agreement  from NCI's  [REDACTED]  for use in other
     screening assays will enable NCI and SUGEN to explore fully the therapeutic
     potential of the compounds identified as "hits" on SUGEN's targets.

Resources

o    NCI will format and provide compounds to SUGEN for testing.

o    SUGEN will provide a [REDACTED] payment to NCI under the CRADA (per sample
     basis) for the  formatting,  shipping and other costs  associated  with the
     sampling and transfer of the compounds.

o    SUGEN will [REDACTED].

                                    PROJECT 4

Preclinical Studies and Clinical Trials

Should a lead  compound(s)  be isolated,  preclinical  testing (and  ultimately,
clinical trials) may be possible under this CRADA. However,  preclinical testing
and  clinical  trials  shall not be initiated  without an  appropriate  mutually
agreeable written amendment to this CRADA.


                                      A-4
<PAGE>
                                                CONFIDENTIAL TREATMENT REQUESTED

Appendix A - Confidential                                              CRADA 345
NCI/SUGEN


[REDACTED] The written  amendment(s) to the executed CRADA should clearly define
the roles, contributions and obligations of the Parties under the CRADA, as they
may  relate  to  any  preclinical  testing  or  clinical  studies.  The  Parties
understand that these obligations will likely involve [REDACTED],  as negotiated
by the Parties at that time, for CRADA-related  research which is the subject of
the amendment(s).

Resources

The resources as they may relate to Project 4  collaboration  for preclinical or
clinical  studies  will  be  determined  upon  the  identification  of any  lead
compound(s). The CRADA will be amended appropriately.



                                      A-5
<PAGE>

                                                CONFIDENTIAL TREATMENT REQUESTED



                                   [REDACTED]



                                      A-6
<PAGE>
                                                CONFIDENTIAL TREATMENT REQUESTED



                                   [REDACTED]





                                      A-7
<PAGE>
                                                CONFIDENTIAL TREATMENT REQUESTED



                                   [REDACTED]






                                      A-8
<PAGE>
                                                CONFIDENTIAL TREATMENT REQUESTED



                                   [REDACTED]






                                      A-9
<PAGE>
                                                CONFIDENTIAL TREATMENT REQUESTED



                                   [REDACTED]






                                      A-10
<PAGE>
                                                CONFIDENTIAL TREATMENT REQUESTED



                                   [REDACTED]





                                      A-11
<PAGE>

                                                CONFIDENTIAL TREATMENT REQUESTED



                                   [REDACTED]





                                      A-12
<PAGE>

                                                CONFIDENTIAL TREATMENT REQUESTED

                                   [REDACTED]







                                      A-13
<PAGE>
                                                
Appendix A - Confidential                                              CRADA 345
NCI/SUGEN

                           Abstract for Public Release

The  proposed  Cooperative  Research  and  Development  Agreement  (CRADA)  will
encompass a joint  collaborative  research effort on the parts of NCI and SUGEN,
Inc. The general  description of the research  project will be molecular  target
characterization  of NCI's cancer  screening  panel  followed by  screening  and
profiling of both NCI and SUGEN compounds in each Party's  respective  screening
assays. Lead compound(s)  identified through these collaborative  efforts may be
the subject of a formally  executed and mutually  agreeable written amendment to
the executed CRADA for further  preclinical  testing  possibly  leading to human
clinical trials.


                                      A-14
<PAGE>


                                   APPENDIX B

               FINANCIAL AND STAFFING CONTRIBUTIONS OF THE PARTIES


                                      -15-
<PAGE>
                                                CONFIDENTIAL TREATMENT REQUESTED

                                                                    Confidential

                                   APPENDIX B

               Financial and Staffing Contributions of the Parties

For NIH:

The Developmental Therapeutics Program, (DTP) DCTDC estimates that [REDACTED] of
effort will be dedicated to its  participation in the research under this CRADA.
(An average of [REDACTED] per year under the CRADA.)

NCI  will  provide  no  funding  to  Company  for  collaborative   research  and
development pursuant to this CRADA,  inasmuch as financial  contributions by the
U.S.  government to  non-Federal  parties under a CRADA is prohibited  under the
Federal Technology Transfer Act of 1986 (15 U.S.C. ss.3710 a(d)(1)).

For SUGEN, Inc.:

Personnel:

SUGEN,  Inc.  intends  to commit  [REDACTED]  of effort  to  permit  the  timely
execution of the studies  implemented under this CRADA. More specifically,  this
staffing  shall  include  SUGEN   [REDACTED]   dedicated  to  the  research  and
development  for the screening  characterization  studies  performed  under this
CRADA.

Funding:

For the molecular target characterization  portion of this CRADA, SUGEN will not
provide  any  funding to the DTP  except  that  SUGEN may  provide a  [REDACTED]
payment to NCI under the CRADA or  directly  to the NCI  contractor  (per sample
basis) for the formatting, shipping and other costs associated with the sampling
and transfer of the compounds.

SUGEN will also provide  funds,  in the amount of [REDACTED] per year to provide
for appropriate and mutually agreeable travel and training for NCI staff related
to the research and development under this CRADA

No funds provided under this CRADA by SUGEN will be used by NCI to [REDACTED].

Should any of the nominal funds remain,  NCI or the NCI  contractor  will return
excess funds to the Collaborator when it sends its final fiscal report.

Payments  for the  [REDACTED]  under this  CRADA  shall be made to DTP or to DTP
contractors as appropriate.


                                      B-1
<PAGE>

                                                CONFIDENTIAL TREATMENT REQUESTED

                                                                    Confidential

Payments by SUGEN to NCI for [REDACTED]  will be made only after  execution of a
separately negotiated and mutually agreeable written amendment to this CRADA.


                                      B-2
<PAGE>


                                   APPENDIX C

                    EXCEPTIONS OR MODIFICATIONS TO THIS CRADA

                                      -16-
<PAGE>

                                                CONFIDENTIAL TREATMENT REQUESTED

                                                                    Confidential

                                   APPENDIX C

                    EXCEPTIONS OR MODIFICATIONS TO THIS CRADA

Add a new Article 3.3 as follows:

3.3  Research  Team.  The  Parties  agree  to  establish  a joint  research  and
     development  team  (hereinafter  referred to as the "Team")  comprising  at
     least the  Principal  Investigators  designated  pursuant to Article 3.1 to
     conduct and monitor the research in  accordance  with the RP.  Although the
     members of the Team shall be  considered  as having been  delegated  to the
     Team, they shall continue to remain employed by their respective  employers
     under their respective terms of employment.  The initial composition of the
     Team  shall  be  2  voting  members  on  behalf  of  SUGEN,  including  the
     Collaborator Principal Investigator designated pursuant to Article 3.1, and
     [REDACTED]  designated  pursuant to Article 3.1. The chair of the Team will
     alternate on a yearly basis  between NCI and SUGEN.  The  membership of the
     Team may be changed from time to time as mutually agreed by NCI and SUGEN

Add a new Article 3.4 as follows:

3.4  Exclusive Collaborator for Subject Research Project: The scope of the CRADA
     Research Plan (Appendix A) will be appropriately and explicitly  defined by
     the list of molecular  targets and the  corresponding  RNA screening assays
     (see  pages  A-5 and  A-6),  as  agreed  upon by the  Parties  prior to the
     execution of this Agreement,  and will be modifiable after execution of the
     CRADA only by written  amendment.  NCI agrees that SUGEN will be designated
     as the exclusive  collaborator  with NCI with regard to RNA screening assay
     characterization  of the NCI  cancer  screening  panel for the RTK / TK and
     specific phosphatase expression status for the molecular targets designated
     and, accordingly, NCI will not collaborate with any other commercial entity
     with regard to the designated target assays.

Add a new Article 3.5 as follows:

3.5  Additional  Research:  SUGEN  and NCI shall be free to  sponsor  additional
     molecular targeting research relating to the characterization of tumor cell
     panels outside the scope of this CRADA. As agreed by the Parties, molecular
     target screening research by SUGEN with NCI tumor cell panels is limited to
     the scope of this CRADA.

Add the following to the end of Article 4.1 Interim Reports:

     "Reports from the Research Team or copies of screening results updating the
     progress of the CRADA  research  shall satisfy the  reporting  requirements
     under this Article 4.1."

Revise the first two sentences of Article 7.2 to read as follows:


                                      C-1
<PAGE>

                                                CONFIDENTIAL TREATMENT REQUESTED

Appendix C - Confidential                                              CRADA 345
NCI/SUGEN

     "The  option of Article  7.1 must be  exercised  by written  notice  mailed
     within  [REDACTED]  after  collaborator  receives  written  notice that the
     patent or other IP  application  is filed.  Exercise  of this option by the
     Collaborator initiates a negotiation period that expires [REDACTED] of said
     license option."

Article 8.6 shall be modified by adding the following paragraphs to the end:

     Notwithstanding  the  previous  paragraph,  target data  produced by SUGEN,
     provided to NCI for  database  analysis and  incorporation  under the CRADA
     will be held in  confidence  by the  parties for a period not to exceed one
     year.  For  [REDACTED],  will  be  accommodated  by NCI  only  upon  mutual
     agreement  of the  Parties.  Conversely,  [REDACTED]  produced by SUGEN and
     analyzed by NCI may become  publicly  available  during the one year period
     only upon mutual agreement of the Parties.  The time period begins when NCI
     provides  SUGEN with  [REDACTED]  obtained  from its analysis of data which
     SUGEN had  provided for each  [REDACTED].  SUGEN  understands  that NCI may
     periodically  make requests to publish data during the one year period when
     it would be beneficial to the  fundamental  technology  underlying  the NCI
     National  Screening  Program  and the  advancement  of cancer  research  in
     general.  These  requests by NCI will be  primarily  for  dissemination  of
     important information and shall not be unreasonably denied by SUGEN.

     Data which relates either to receptor  targets or lead  compounds  which is
     jointly  produced by the Parties may be  published  by NCI only after SUGEN
     has had the opportunity to review the manuscript in accordance with Article
     9.6 of this Agreement.  SUGEN may redact any  proprietary and  confidential
     information as reasonably appropriate.

     Provided  that the Parties  either  individually  or jointly  (as  mutually
     agreed) are actively  developing any lead compound,  the Parties agree that
     the proprietary information relating to the identity and nature of the lead
     compounds  produced  by NCI and SUGEN  will not be  disclosed  to any other
     party prior to entrance of the compound into the NCI Decision Network Level
     III (clinical)  decision point. Active development should be interpreted by
     the  parties  to  mean a  reasonable  rate  of  progress  on any  promising
     compounds along a development plan as measured in comparison to the general
     NCI Decision Network process. The active development of each compound shall
     be addressed in each regular  Interim Report  pursuant to Article 4 of this
     Agreement.  Concerns by NCI related to the progress of compound development
     by SUGEN shall be forwarded to SUGEN in writing and subsequently  addressed
     by SUGEN in the next Interim Report or six months later,  whichever date is
     later.

     For the purposes of this Agreement, "Publication" means any written or oral
     dissemination  or  any  other  public   dissemination  of  the  information
     including posting of the information on the World Wide Web or Internet.



                                      C-2
<PAGE>
                                                

Appendix C - Confidential                                              CRADA 345
NCI/SUGEN

Add a new Article 8.8 as follows:

8.8  Providing  Subject  Data  produced  by NCI to  non-CRADA  Parties by SUGEN.
     Because  NCI has a duty to protect  the  integrity  and quality of the Data
     generated  by the NCI under this  Agreement,  Subject  Data which have been
     provided  to  Collaborator  may be  made  available  to a  third  party  by
     Collaborator subject to the following conditions:

     a.   Access  to the  NCI-produced  Subject  Data by a third  party  must be
          deemed   necessary  by  Collaborator   for  the   development   and/or
          commercialization  of the CRADA  technology (ie. Said third party will
          play  a  role  in  the  development  or  regulatory  approval  of  the
          technology or any agent(s);
     b.   Collaborator  agrees to keep accurate  records of all transfers of NCI
          Subject data to a third party;
     c.   All  transfers  of NCI Subject  data to a third party by  Collaborator
          shall be protected by terms of Confidentiality at least as restrictive
          as the terms of  Confidentiality  which bind the transfer of data from
          NCI to Collaborator;
     d.   NCI data may not be sold or  transferred  for any  consideration  to a
          third party by Collaborator; and
     e.   Data which is transferred  either to Collaborator by NCI or to a third
          party by Collaborator shall be maintained in essentially the same form
          as it was received from the NCI.



                                      C-3
<PAGE>

                                                

Appendix D - Confidential                                              CRADA 345
NCI/SUGEN

                                   APPENDIX D

         Intellectual Property, Licensing, and Other Related Agreements

1) A Letter of Intent  (LOI) for the  Subject  CRADA was  executed  between  the
Parties on December 11, 1995. A copy is attached hereto.

2)  SUGEN  currently  is the  CRADA  collaborator  with  NCI  for  the  Clinical
Development  of SU-101.  NCI CRADA # 294 was executed on August 14, 1995 with an
effective date of May 25, 1995.


                                      D-1
<PAGE>

                                                

                                                                 Tom Mays

                                                            Document Type:  Lett
                                                       File Number: CRADA #00345
DEPARTMENT OF HEALTH & HUMAN SERVICES
- --------------------------------------------------------------------------------
                                                   National Institutes of Health
                                                       National Cancer Institute
                                                            Office of Technology
                                                                     Development
                                                             9000 Rockville Pike
                                                            Bldg.  31, Room 4A51
                                                        Bethesda, Maryland 20892
                                                                  (301) 496-0477
                                                              (301) 402-2117 fax

December 4, 1995

Mr. Stephen Evans-Freke
Chairman and CEO
SUGEN, Inc.
515 Galveston Drive
Redwood City, CA 94063


Re:       Proposed Cooperative Research and Development Agreement (CRADA)
CRADA #:    345
NCI Principal Investigator:  Dr. George Johnson
Collaborator Investigator:   Dr. Peter Hirth
Title: Characterization of the NCI Cancer Screening Panel Regarding RTK/TK and
       Phosphatase Expression Status and Profiling of NCI and SUGEN Lead
       Structures.

Dear Mr. Evans-Freke,

It is my  understanding  that a  cooperative  research and  development  project
between the parties referenced below is being considered.  Accordingly,  until a
formal Collaborative  Research and Development  Agreement (CRADA) is reviewed by
the CRADA  Subcommittee and approved by the Director,  National Cancer Institute
(NCI), this Letter is offered to permit joint research to commence.

It is acknowledged by the parties below that  cooperative  research  pursuant to
the Research Plan,  attached as Appendix A, will be conducted  informally by the
NCI Principal  Investigator  and  Collaborator  pending formal  approval of this
CRADA. It is further acknowledged that patentable  inventions may be made by NCI
employees and  employees of the  Collaborator.  Pursuant to its authority  under
Federal  Technology  Transfer Act of 1986,  NCI agrees that should this CRADA be
approved,  it will have  retroactive  effect to the date that the last party has
executed  the Letter  for any  inventions  that may be made under this  Research
Plan.  NCI further  agrees that this CRADA will have  retroactive  effect to the
date  



                                      -1-
<PAGE>

                                                CONFIDENTIAL TREATMENT REQUESTED

that the last party has  executed  this Letter for  confidentiality  obligations
specified  in the NIH  Model  CRADA.  The NIH  Model  CRADA  provisions  for the
protection of  proprietary  information  are  incorporated  by reference and are
considered  controlling.  These  provisions  include,  but are not  limited  to,
Articles 2.2 and 9.1-9.7. The NIH Model CRADA is attached as Appendix B.

Prior to the  execution  of the  CRADA,  SUGEN and NCI will  jointly  generate a
[REDACTED]  which  will be the  subject  of this  CRADA.  The scope of the CRADA
Research Plan will be appropriately and explicitly defined by the [REDACTED] and
will be  modifiable  after  execution  of the CRADA only by  written  amendment.
Additionally,  NCI agrees that the CRADA will  designate  SUGEN as the exclusive
collaborator with NCI for the characterization of the NCI cancer screening panel
with regard to the designated molecular targets and,  accordingly,  NCI will not
collaborate  with any other  commercial  entity  with  regard to the  designated
targets.

Finally,  the Parties  recognize  that the U.S.  Public  Health  Service  policy
relating to the "Pricing"  clause formerly at Article 8.3 of the NIH Model CRADA
and at  Article  5.04 of the PHS  Model  Exclusive  License  Agreement  has been
rescinded. Consequently, said "Pricing" clause will be deleted and will be of no
force and effect in this CRADA, if subsequently approved and executed, or in any
subsequent exclusive licenses granted on Subject Inventions under this CRADA.

You  understand,  however,  that this letter is not a commitment  on the part of
either party to enter into a CRADA. Further, this Letter is effective for a term
of [REDACTED] The [REDACTED]  term may be extended,  provided the CRADA is under
active  negotiation and the collaborative  research is continuing.  Assuming the
necessary   approvals  are   forthcoming,   we  look  forward  to  a  successful
collaboration.

Sincerely,

/s/ Thomas D. Mays

Thomas D.  Mays, Ph.D., J.D.
Director, NCI Office of Technology Development

- --------------------------------------------------------------------------------
ACCEPTED AND AGREED TO:

National Cancer Institute          SUGEN, Inc.

/s/ Alan S. Rabson                 /s/ Stephen Evans-Freke
- -----------------------------      ----------------------------------
Alan S. Rabson, M.D.               Mr. Stephen Evans-Freke
Deputy Director, NCI               Chairman and CEO

12/6/95                            12/11/95
- -----------------------------      ----------------------------------
Date                               Date


                                      -2-
<PAGE>

                            
Attachments:
     Appendix A: LOI Research Plan
     Appendix B: NCI Model CRADA

cc:  Mr. Dan Kiser, Esq., Fox, Bennett & Turner
     Dr. George Johnson, DCTDC, NCI


                                      -3-
<PAGE>

                                                CONFIDENTIAL TREATMENT REQUESTED

                    Letter of Intent Research Plan Appendix A

                                  Introduction

The  proposed  Cooperative  Research  and  Development  Agreement  (CRADA)  will
encompass a joint  collaborative  research effort on the parts of NCI and SUGEN,
Inc. in the projects as detailed below. The general  description of the research
project  will be molecular  target  characterization  of NCI's cancer  screening
panel  (Project 1) followed by  screening  and  profiling  of both NCI and SUGEN
compounds in each Party's  respective  screening assays (Projects 2 and 3). Lead
compound(s) identified through these collaborative efforts may be the subject of
a formally  executed and mutually  agreeable  written  amendment to the executed
CRADA for further  preclinical testing possibly leading to human clinical trials
(Project 4).

                      Overview and Objectives of This CRADA

                                    PROJECT 1

Overview

o    The  Parties  will  collaborate  on the  characterization  of NCI's  cancer
     screening  panel of sixty selected tumor cell lines  regarding the RTK / TK
     and specific phosphatase  expression status. (Prior to the execution of the
     CRADA, SUGEN and NCI will provide a [REDACTED] which will be the subject of
     this CRADA. The scope of the CRADA Research Plan will be appropriately  and
     explicitly defined by the [REDACTED] and will be modifiable after execution
     of the CRADA only by written  amendment.  The CRADA will designate SUGEN as
     the [REDACTED]  collaborator with NCI for the  characterization  of the NCI
     cancer screening panel with regard to the designated molecular targets and,
     accordingly, NCI will not collaborate with any other commercial entity with
     regard to the designated targets.)

o    NCI's computer screening database will be searched for [REDACTED]

o    SUGEN will perform  verification  testing of the open listed (see Project 3
     Overview) correlates against the molecular target.

Objectives

o    With this information,  the Collaborators will learn if the NCI tumor panel
     contains many of the recently  discovered  dominant  mechanisms  underlying
     cancer growth.

o    The results from obtaining this  information  could be the [REDACTED] SUGEN
     and  NCI  could  also  use the  [REDACTED]  information  to  help  evaluate
     [REDACTED]  stored in the NCI  databases  and 


                                    LOI-A-1


<PAGE>
                                                CONFIDENTIAL TREATMENT REQUESTED

CRADA Letter of Intent Research Plan                                   CRADA 345
NCI-SUGEN                                                             Appendix A


     SUGEN would be able to adopt (through CRADA  amendment(s)  and/or licensing
     if necessary) NCI leads as part of SUGEN's Drug Discovery Program.

Resources

o    NCI will provide cell lines to SUGEN.

o    SUGEN will perform  [REDACTED] at the expected  expense of [REDACTED] per 1
     year.

o    SUGEN and NCI will jointly develop [REDACTED]

                                    PROJECT 2

Overview

o    SUGEN's lead structures from SUGEN's  screening program will be profiled in
     NCI's tumor cell line panel.

o    NCI's  computer  screening  database  will be searched for  compounds  with
     cytotoxicity profiles which best match that of the lead structure.

o    SUGEN will perform  verification testing of the SUGEN compounds against the
     target.

Objectives

o    The profiling of SUGEN's leads in NCI's tumor panel could identify  utility
     in [REDACTED]

o    The  screening  results  might  help  SUGEN  to test  certain  leads in the
     appropriate  preclinical  models and in the case of more advance compounds,
     [REDACTED] in Phase II / III studies.

o    From the search of NCI's computer  database,  new leads could be identified
     for development.

Resources

o    SUGEN will provide  compounds with a synthesis cost estimated at [REDACTED]
     per year.

o    NCI will test compound in cell panel.

o    NCI will analyze  cytotoxicity  database and provide available  correlating
     compounds to SUGEN for verification testing.

                                    LOI-A-2

<PAGE>
                                                CONFIDENTIAL TREATMENT REQUESTED

CRADA Letter of Intent Research Plan                                   CRADA 345
NCI-SUGEN                                                             Appendix A

                            PROJECT 3

Overview

o    Compounds  selected from NCI's open repository  [REDACTED] will be screened
     against SUGEN's primary screening assays.

                                     LOI-A-3

    




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