SUGEN INC
10-Q, 1998-11-13
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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================================================================================

                                  UNITED STATES
                       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 September 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:
                                     0-24814
                          -----------------------------


                                   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.)


          230 East Grand Avenue, South San Francisco, California 94080
                    (address of principal executive offices)


                                 (650) 553-8300
              (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;
16,399,209 shares outstanding at October 31, 1998.


================================================================================


<PAGE>


                                   SUGEN, Inc.

                                      INDEX



                                                                        PAGE NO.
PART I.  FINANCIAL INFORMATION                                          --------

Item 1.  Financial Statements and Notes

         Condensed Consolidated Balance Sheets - September 30, 1998
         and December 31, 1997                                              3

         Condensed Consolidated Statements of Operations -
         for the three and nine months ended September 30, 1998 and 1997    4

         Condensed Consolidated Statements of Cash Flows - for the nine
         months ended September 30, 1998 and 1997                           5

         Notes to Condensed Consolidated Financial Statements               6

Item 2.  Management's Discussion and Analysis of Financial
         Condition and Results of Operations                                8

PART II. OTHER INFORMATION

Item 5.  Other Information                                                 13

Item 6.  Exhibits and Reports on Form 8-K                                  13

Signatures                                                                 14

Exhibit Index                                                              15



                                        2

<PAGE>


<TABLE>
                                                    PART I. FINANCIAL INFORMATION


Item 1.   FINANCIAL STATEMENTS AND NOTES

                                                             SUGEN, Inc.

                                                CONDENSED CONSOLIDATED BALANCE SHEETS
                                                           (In thousands)

<CAPTION>
                                                                                                September 30,           December 31,
                                                                                                    1998                    1997
                                                                                                  ---------               ---------
<S>                                                                                               <C>                     <C>      
ASSETS                                                                                           (unaudited)                 (1)
Current assets:
        Cash and cash equivalents                                                                 $  15,390               $  23,816
        Short-term investments                                                                       38,912                  51,479
        Prepaid expenses and other current assets                                                     1,174                     991
                                                                                                  ---------               ---------
              Total current assets                                                                   55,476                  76,286

Property and equipment, net                                                                           5,600                   4,601
Other assets                                                                                          2,604                   3,938
                                                                                                  ---------               ---------
                                                                                                  $  63,680               $  84,825
                                                                                                  =========               =========

LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
        Accounts payable                                                                          $   2,732               $   1,991
        Accrued liabilities                                                                          13,767                  10,267
        Deferred contract revenue                                                                       625                     625
        Capital lease obligations - current portion                                                   2,534                   2,277
                                                                                                  ---------               ---------
              Total current liabilities                                                              19,658                  15,160

Long-term liabilities:
        Capital lease obligations - non-current portion                                               4,741                   3,152
        Senior custom convertible notes                                                               7,369                  17,500
                                                                                                  ---------               ---------
              Total long-term liabilities                                                            12,110                  20,652

Stockholders' equity:

        Common stock                                                                                154,494                 141,579
        Deferred compensation                                                                          (839)                   (695)
        Note receivable from stockholder                                                               (883)                   (883)
        Accumulated deficit                                                                        (120,860)                (90,988)
                                                                                                  ---------               ---------
              Total stockholders' equity                                                             31,912                  49,013
                                                                                                  ---------               ---------
                                                                                                  $  63,680               $  84,825
                                                                                                  =========               =========

<FN>
(1) Derived from audited financial statements at this date.


                                                       See accompanying notes.
</FN>
</TABLE>

                                                                  3

<PAGE>


<TABLE>
                                                             SUGEN, Inc.

                                           CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
                                              (In thousands, except per share amounts)
                                                             (unaudited)

<CAPTION>
                                                                             Three Months Ended               Nine Months Ended
                                                                                September 30,                   September 30,
                                                                           ------------------------        ------------------------
                                                                             1998            1997            1998            1997
                                                                           --------        --------        --------        --------
<S>                                                                        <C>             <C>             <C>             <C>     
Contract revenue (includes amounts from
   related party)                                                          $  5,164        $  1,336        $  9,160        $  4,307

Costs and expenses:
    Research and development                                                 12,682           8,728          33,825          25,304
    General and administrative                                                2,925           1,660           6,769           4,650
                                                                           --------        --------        --------        --------
       Total costs and expenses                                              15,607          10,388          40,594          29,954
                                                                           --------        --------        --------        --------

Operating loss                                                              (10,443)         (9,052)        (31,434)        (25,647)

Other income and expenses:
    Interest income                                                             815             576           2,677           1,879
    Interest expense                                                           (337)           (249)         (1,204)           (593)
                                                                           --------        --------        --------        --------
       Other income, net                                                        478             327           1,473           1,286
                                                                           --------        --------        --------        --------
Net loss                                                                   $ (9,965)       $ (8,725)       $(29,961)       $(24,361)
                                                                           ========        ========        ========        ========


Basic and diluted net loss per share                                       $  (0.62)       $  (0.66)       $  (1.90)       $  (1.86)
                                                                           ========        ========        ========        ========

Shares used in computing basic and diluted net loss
  per share                                                                  16,171          13,137          15,746          13,079
                                                                           ========        ========        ========        ========

<FN>
                                                       See accompanying notes.
</FN>
</TABLE>

                                                                  4

<PAGE>


<TABLE>
                                                             SUGEN, Inc.

                                           CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
                                          Increase (decrease) in cash and cash equivalents
                                                           (In thousands)
                                                             (unaudited)

<CAPTION>
                                                                                                           Nine Months Ended
                                                                                                             September 30,
                                                                                                       ----------------------------
                                                                                                         1998                1997
                                                                                                       --------            --------
<S>                                                                                                    <C>                 <C>      
Cash flows from operating activities
Net loss                                                                                               $(29,961)           $(24,361)
Adjustments to reconcile net loss to net cash provided by (used in)
operating activities:
      Depreciation and amortization                                                                       2,858               2,271
      Deferred revenue                                                                                     --                   250
      Changes in operating assets and liabilities:
        Prepaid expenses and other current assets                                                          (183)                 72
        Other assets                                                                                       (163)             (1,339)
        Accounts payable                                                                                    741               1,037
        Accrued liabilities                                                                               3,557                 580
                                                                                                       --------            --------
Net cash used in operating activities                                                                   (23,151)            (21,490)
                                                                                                       --------            --------

Cash flows from investing activities
Sales/maturities (purchases) of short-term investments, net                                              12,656               4,998
Purchases of property and equipment, net                                                                 (3,358)             (1,800)
                                                                                                       --------            --------
Net cash provided by investing activities                                                                 9,298               3,198
                                                                                                       --------            --------

Cash flows from financing activities
Proceeds from issuance of common stock, net                                                               3,581               1,118
Proceeds from issuance of senior custom convertible notes                                                  --                17,500
Proceeds from lease financing of property and equipment                                                   3,702               1,895
Payments under capital lease obligations                                                                 (1,856)             (1,540)
                                                                                                       --------            --------
Net cash provided by financing activities                                                                 5,427              18,973
                                                                                                       --------            --------

Net (decrease) increase in cash and cash equivalents                                                     (8,426)                681
Cash and cash equivalents at beginning of period                                                         23,816              24,852
                                                                                                       --------            --------
Cash and cash equivalents at end of period                                                             $ 15,390            $ 25,533
                                                                                                       ========            ========

<FN>
                                                       See accompanying notes.
</FN>
</TABLE>

                                                                  5

<PAGE>


                                   SUGEN, Inc.

              NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

                                   (Unaudited)


1.   Summary of Organization and Significant Accounting Policies

     Basis of Presentation

     The accompanying  condensed  consolidated  financial statements include the
     accounts of SUGEN, Inc. (the "Company") and its wholly-owned  subsidiaries.
     All material intercompany transactions and balances have been eliminated in
     consolidation.  The  condensed  consolidated  financial  statements  as  of
     September 30, 1998, the condensed consolidated statements of operations for
     the  three and nine  months  ended  September  30,  1998 and 1997,  and the
     condensed  consolidated  statements of cash flows for the nine months ended
     September  30,  1998 and 1997,  have been  prepared  by the Company and are
     unaudited.  In  the  opinion  of  management,   all  necessary  adjustments
     (consisting  only  of  normal  recurring  adjustments)  which  the  Company
     considers  necessary for the fair presentation of the financial position at
     such date and the  operating  results and cash flows for those  periods are
     included.  The accompanying  condensed  consolidated  financial  statements
     should  be read in  conjunction  with the  financial  statements  and notes
     thereto for the year ended December 31, 1997 included in the Company's Form
     10-K filed with the U.S. Securities and Exchange Commission. The results of
     the  Company's  operations  for any  interim  period  are  not  necessarily
     indicative  of the results of the  Company's  operations  for a full fiscal
     year.

     Subsidiary

     In June  1998,  the  Company  established  SUGEN  International  AG ("SUGEN
     International"),  incorporated  in the  Canton  of Zug,  Switzerland,  as a
     wholly-owned  subsidiary having no independent operations through September
     30, 1998.  SUGEN Europe AG ("SUGEN Europe") was established in August 1998,
     as a wholly-owned  subsidiary of SUGEN  International.  SUGEN International
     and SUGEN  Europe  will hold  certain  rights to the  Company's  technology
     portfolio outside of North America.

     Formation Costs

     Formation costs  associated with the  establishment of the subsidiaries are
     expensed as incurred. These costs include legal, tax and accounting fees.

     Foreign Currency Translation

     The functional currency of the Company's  wholly-owned  subsidiaries is the
     Swiss Franc.  Assets and liabilities of the  subsidiaries are translated at
     the  United  States  Dollar  exchange  rate in effect at each  period  end.
     Amounts  included  in  the  subsidiaries'   statements  of  operations  are
     translated  at the average rate of exchange  prevailing  during the period.
     Adjustments   resulting  from  the  translation  of  financial   statements
     denominated in Swiss Francs,  if  significant,  are reflected as a separate
     component of consolidated stockholders' equity.

                                        6

<PAGE>


                                   SUGEN, Inc.

        NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (continued)

                                   (Unaudited)

2.   Accrued Liabilities

     The components of accrued liabilities consist of the following:

                                                     September 30,  December 31,
                                                         1998         1997
                                                        -------     -------
                                                          (In thousands)
     Accrued research & development services            $ 8,017     $ 5,351
     Accrued compensation                                 1,479       1,176
     Accrued professional fees                            1,203
                                                                        859
     Other                                                3,068       2,881
                                                        -------     -------
                                                        $13,767     $10,267
                                                        =======     =======


3.   Research and Development Collaboration Agreements

     Allergan, Inc.

     In July  1998,  the  first  milestone  in  connection  with  the  Company's
     collaboration with Allergan,  Inc. was achieved in the angiogenesis program
     for the treatment of ophthalmic diseases.  The $437,500 Allergan milestone,
     net of royalties, is included in contract revenue.

     Taiho Pharmaceutical Ltd.

     In  July  1998,   the  Company   entered  into  an  agreement   with  Taiho
     Pharmaceutical Ltd. ("Taiho") for the development and  commercialization of
     the Company's  angiogenesis  inhibitors for the prevention and treatment of
     cancer.  In connection  with this agreement,  Taiho will receive  marketing
     rights in Japan,  while the Company  will retain  marketing  rights for the
     rest of the world. The Company received an initial  research  payment,  and
     will receive research and development  funding and additional payments upon
     the achievement of certain milestones.  The Company has retained the rights
     to manufacture and supply products to Taiho for sale in Japan.

4.   Senior Custom Convertible Notes

     From January  through  September  30, 1998,  $10.2 million of principal and
     accrued and unpaid interest  relating to the Company's  outstanding  senior
     custom convertible notes were converted into 854,106 shares of Common Stock
     at a weighted average price of $12.05 per share.

                                        7

<PAGE>


                                   SUGEN, Inc.

Item 2.  MANAGEMENT'S DISCUSSION AND ANALYSIS
         OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

     In addition to  historical  information  contained  herein,  the  following
discussion contains words such as "intends," "believes," "anticipates," "plans,"
"expects" and similar expressions which are intended to identify forward-looking
statements  within the meaning of Section 27A of the  Securities Act of 1933, as
amended,  and Section 21E of the  Securities  Exchange Act of 1934,  as amended,
which are subject to the "safe harbor" created by those sections.  The Company's
actual  results  could  differ  materially  from the results  discussed in these
forward-looking  statements.  Factors  that could  cause or  contribute  to such
differences include the factors discussed below as well as the factors discussed
in the  Company's  Form 10-K for the year ended  December 31, 1997.  Readers are
cautioned not to place undue reliance on these forward-looking statements, which
speak only as of the date  hereof.  The  Company  undertakes  no  obligation  to
release the results of any revision to these  forward-looking  statements  which
may be made to reflect events or  circumstances  occurring after the date hereof
or to reflect the occurrence of unanticipated events.

Overview

     SUGEN, Inc. ("SUGEN" or the "Company") was founded in July 1991 to discover
and develop new classes of small molecule drugs which target  specific  cellular
signal  transduction  pathways.  These  signalling  pathways  are  involved in a
variety  of  chronic  and acute  pathological  diseases,  including  cancer  and
diabetes  as  well  as  in  dermatologic,   ophthalmic,  neurologic  and  immune
disorders.  The Company's  most advanced  product  candidate is SU101, a PDGF TK
signalling antagonist.  The Company initiated a Phase III clinical trial for use
of SU101 as a treatment for refractory malignant glioma during the first quarter
of 1998.  Additionally,  SUGEN currently has underway  multiple Phase II studies
including SU101 in combination with BCNU in front-line  glioma,  mono-therapy in
ovarian and non-small cell lung cancer and  mono-therapy and in combination with
mitozantrone in hormone refractory  prostate cancer. To date,  approximately 313
patients,  including patients with brain,  ovarian,  prostate and non-small cell
lung cancers, have been treated with SU101 in eleven Company-sponsored  clinical
trials. The Company's second cancer product candidate, SU5416, is a Flk-1/KDR TK
antagonist which inhibits  angiogenesis  (the process by which blood vessels are
formed).  Currently,  the Company is conducting multiple Phase I clinical trials
for  SU5416 in solid  tumors in Europe  and the U.S.  and a Phase  I/II study of
SU5416 in Kaposi's  sarcoma.  In addition,  the Company is  conducting a Phase I
clinical trial for SU5271,  an EGF  antagonist,  for the treatment of psoriasis.
Through  September 30, 1998,  substantially  all of the Company's  revenue apart
from  interest  income has been earned  pursuant to  collaborations  with Zeneca
Limited  ("Zeneca"),  ASTA Medica  Aktiengesellschaft  ("ASTA  Medica"),  Vision
Pharmaceuticals  L.P.,  an affiliate  of  Allergan,  Inc.,  and  Allergan,  Inc.
(collectively  "Allergan") and Taiho Pharmaceutical Ltd. ("Taiho").  The Company
intends to pursue its cancer  drug  discovery  programs  independently  in North
America  and  its  programs  in  other  disease  areas  in  collaboration   with
established pharmaceutical companies.

     In June  1998,  the  Company  established  SUGEN  International  AG ("SUGEN
International"),   incorporated  in  the  Canton  of  Zug,  Switzerland,   as  a
wholly-owned  subsidiary having no independent  operations through September 30,
1998.  SUGEN Europe AG ("SUGEN  Europe") was  established  in August 1998,  as a
wholly-owned  subsidiary of SUGEN  International.  SUGEN International and SUGEN
Europe will hold certain rights to the Company's technology portfolio outside of
North America.

                                        8

<PAGE>


     The Company has not been  profitable  since  inception and expects to incur
substantial losses for the foreseeable future, primarily due to the expansion of
preclinical  and  clinical  development  activities  as more of its  proprietary
cancer-related  programs  progress  into the clinic.  The Company  expects  that
losses will fluctuate from quarter to quarter and that such  fluctuations may be
substantial.  As of September 30, 1998,  the Company's  accumulated  deficit was
$120.9 million.

Results of Operations

     The  Company's  revenues for the three and nine months ended  September 30,
1998 were $5.2 million and $9.2 million, respectively.  These results compare to
revenues  of $1.3  million  and $4.3  million  for the same  periods  last year.
Revenues  for the  three and nine  months  ended  September  30,  1998  included
contract revenue from the Zeneca, Taiho and Allergan collaborations,  milestones
and contract services revenue (services  rendered by ASTA Medica pursuant to the
collaboration but on non-collaboration  programs) and recognition of the initial
research  payment  received in  connection  with a  collaboration  with  ProChon
Biotech Limited.  In 1997,  revenue included  contract revenue from the Allergan
and Zeneca  collaborations  and contract  services revenue earned under the ASTA
Medica  collaboration  for  non-collaboration  programs.  The Company expects to
fully utilize the remaining  available credit for contract  services provided by
ASTA Medica by the end of 1998, and thereafter will only recognize revenue under
the ASTA Medica collaboration upon the achievement of specified milestones.

     Research and  development  expenses  increased  to $12.7  million and $33.8
million for the three and nine months ended  September  30, 1998,  respectively,
from $8.7 million and $25.3 million for the same periods last year. The increase
during 1998 was primarily due to higher personnel  related costs associated with
the expansion of clinical  development  activities,  including expanded Phase II
studies  and  initiating  a Phase III study of the  Company's  lead  anti-cancer
compound,  SU101.  The  initiation  of Phase I and  Phase  I/II  studies  of the
Company's second cancer product  candidate,  SU5416,  also contributed to higher
expenses  during 1998.  The Company  expects  that its research and  development
expenses will continue to grow in future periods due to the hiring of personnel,
additional  preclinical studies, the progression of SU101, SU5416 and additional
drug  candidates in clinical  trials,  and research and  development  activities
pursuant to the Company's commitments under anticipated future collaborations.

     General and  administrative  expenses  for the three and nine months  ended
September  30, 1998 were $2.9  million  and $6.8  million,  respectively.  These
results  compare to  expenses  of $1.7  million  and $4.7  million  for the same
periods last year.  The increase in 1998 was primarily  due to higher  headcount
related   costs,   costs   associated   with  the  formation  of  the  Company's
international  subsidiaries,  as well as  additional  expenses  in the  areas of
corporate  and business  development.  The Company  expects that its general and
administrative  expenses  will  continue  to  increase  in order to support  the
Company's  expanding research and development  efforts both  internationally and
domestically.

     Interest  income for the three and nine months ended September 30, 1998 was
$815,000 and $2.7 million,  respectively,  compared to $576,000 and $1.9 million
earned for the same periods last year.  The increase  from prior year was due to
higher  investment  balances  arising  primarily from issuances of the Company's
capital  stock and senior custom  convertible  notes.  Interest  expense for the
three and nine months ended  September  30, 1998 was $337,000 and $1.2  million,
respectively,  compared to $249,000 and $593,000 for the same periods last year.
This increase was primarily due to the Company's  continued use of capital lease
financing for equipment and property  improvements  and expenses  related to the
issuance of senior custom convertible notes.

                                        9

<PAGE>


Liquidity and Capital Resources

     At  September  30,  1998,  the  Company  had  cash,  cash  equivalents  and
short-term  investments of approximately $54.3 million compared to approximately
$75.3 million at December 31, 1997. The decrease in cash and investments  during
the nine months ended  September 30, 1998 was primarily due to operating  losses
partially offset by the issuance of Common Stock.

     Through  September 1998, the Company's  principal sources of financing have
been its initial and follow-on public  offerings of Common Stock,  placements of
the Company's  Preferred and Common Stock and senior custom  convertible  notes,
and funds received under the Company's corporate  collaborations.  The Company's
current  principal  sources  of  liquidity  are  its  research  and  development
collaborations  with Zeneca,  Taiho,  Allergan and ASTA Medica,  its cash,  cash
equivalents and short-term investments and capital lease financing. At September
30, 1998, the Company had a capital lease line of $2.7 million available for the
purchase of equipment and facility improvements.

     The Company has entered into license and  research  agreements  whereby the
Company funds research  projects  performed by others or  in-licenses  compounds
from third  parties.  Some of the  agreements  may  require  the Company to make
milestone and royalty payments.  Under these programs,  commitments for external
research funding are approximately $1.7 million,  $1.6 million, $1.4 million and
$1.1  million  in  1998,  1999,  2000  and  2001,  respectively.  Most of  these
commitments  are cancelable  within a  three-to-nine  month period and limit the
amounts  payable by the Company for sponsored  research under the programs after
notice of cancellation.  The Company anticipates renewing certain contracts that
expired  in 1997  which  will  increase  future  commitments  beyond  the levels
indicated above for 1999 through 2001.

     From  time  to  time,  the  Company  evaluates  potential   investments  in
complementary  businesses,  products or technologies.  Currently, the Company is
considering modest investments in such complementary businesses during 1998. The
Company  has no other  present  undertakings,  commitments  or  agreements  with
respect to investments in other businesses.

     Net additions of equipment and leasehold  improvements  for the nine months
ended September 30, 1998 were $3.4 million compared to $1.8 million spent during
the same period last year.  Capital  additions during the year primarily related
to costs  associated  with the Company's  new  build-to-suit  facility.  Capital
additions  during the first nine  months of 1997  primarily  included  the costs
associated  with a limited  facility  expansion and the continued  investment in
enhancing the Company's laboratory capabilities.  In October 1998, the Company's
build-to-suit  facility was  completed,  coinciding  with the  expiration of the
pre-existing   facility  leases.  A  majority  of  facility   improvement  costs
associated  with the  build-out  and  equipping  of the new  facility  have been
financed through a tenant improvements allowance negotiated with the landlord as
part  of  the  long  term  lease  agreement  and  through  additional  financial
facilities  arranged  with third  parties.  It is  expected  that the  Company's
capital  lease  obligations,  related  interest  expense  and  facility  related
expenses will increase in future periods,  including  non-recurring move related
costs in the fourth quarter of 1998.

     The Company  estimates that its existing  capital  resources  together with
facility and equipment financing,  expected revenues from current collaborations
and net  income  from  investment  activities,  will be  sufficient  to fund its
planned  operations  into  2000.  However,  there can be no  assurance  that the
underlying assumed levels of revenue and expense will prove accurate. Whether or
not these  assumptions  prove to be  accurate,  the  Company  will need to raise
substantial  additional  capital to fund its operations.  The Company intends to
seek such  additional  funding  through  collaborative  arrangements,  public or
private equity or debt financings and capital lease transactions; however, there
can be no assurance  that  additional  financing will be available on acceptable
terms, or at all. If additional funds are

                                       10

<PAGE>


raised by issuing  equity  securities,  further  dilution  to  stockholders  may
result.  In addition,  in the event that additional  funds are obtained  through
arrangements  with  collaborative  partners,  such  arrangements may require the
Company to relinquish rights to certain of its technologies,  product candidates
or products that the Company would  otherwise  seek to develop or  commercialize
itself.  If  adequate  funds are not  available,  the Company may be required to
delay,  reduce  the  scope  of or  eliminate  one or  more  of its  research  or
development programs, which could have a material adverse effect on the Company.

     The Year 2000 Issue is the result of computer  programs being written using
two digits  rather than four digits to define the  applicable  year.  This could
result in a system failure or miscalculations causing disruptions of operations,
including, among other things, a temporary inability to process transactions, or
engage in similar  normal  business  activities.  The Company has  reviewed  its
existing  software  programs to identify and address  programs  that may require
upgrading  or  reprogramming  to address  the Year 2000 Issue and  believes  its
internal  applications  systems are  currently  in  compliance.  The Company has
initiated formal  communications with all of its significant suppliers and other
significant  third  parties  to  determine  the  extent to which the  Company is
vulnerable  to those third  parties'  failure to  remediate  their own Year 2000
Issues.  The project is estimated to be  completed  early to mid 1999,  which is
prior to any anticipated impact on its operations.  Additionally, the Company is
in the process of developing  contingency plans for  implementation in the event
the Company,  its significant  suppliers or other significant third parties fail
to  adequately  address  Year  2000  issues.   Such  plans  principally  involve
identifying  alternative  vendors  or  internal  remediation.  There  can  be no
assurance  that any such plans will fully  mitigate  such  failures or problems.
Furthermore,  there may be certain significant third parties, such as utilities,
telecommunication  companies, or material vendors where alternative arrangements
or sources are limited or unavailable.

     To date, the Company has not incurred  material Year 2000 compliance  costs
and does not expect any future costs to have a material  impact on the Company's
financial  results.  However,  there can be no assurance that all third parties,
with whom the Company  works to achieve Year 2000  compliance  on a timely basis
for systems related to their  interactions with the Company,  or that failure to
achieve Year 2000 by such  entities will not have a material  adverse  effect on
the Company.

     The Company is at an early stage of  development  and must be  evaluated in
light of the uncertainties and complications present in a biotechnology company.
The  Company  has been in  existence  only  since  1991 and to date  three  drug
candidates  (SU101,  SU5271 and SU5416) have entered clinical trials. To achieve
profitable  operations  on a  continuing  basis,  the  Company,  alone  or  with
collaborative  partners, must successfully develop,  manufacture,  introduce and
market its proposed  products.  Products,  if any,  resulting from the Company's
research and development programs are not expected to be commercially  available
for several more years, even if they are developed successfully and proven to be
safe and effective.  The Company has experienced  significant  operating  losses
since its inception.  The Company expects to incur significant  operating losses
at least for the next several years and expects cumulative losses to increase as
the  Company's  research and  development  efforts,  including  preclinical  and
clinical testing,  are expanded.  Substantially all of the Company's revenues to
date have been  received  pursuant to the Company's  collaborations.  Should the
Company or its collaborators fail to perform in accordance with the terms of any
of their  agreements,  any consequent loss of revenue under the agreements could
have a material adverse effect on the Company's  results of operations.  Some of
the  Company's  currently  proposed  products  are  subject to  development  and
licensing arrangements with the Company's collaborators.  Therefore, the Company
is  in  part  dependent  on  the  research  and  development  efforts  of  these
collaborators  with respect to those  products and is entitled only to a portion
of the revenues,  if any,  realized from the  commercial  sale of those products
covered by the collaborations in many jurisdictions. Before obtaining regulatory
clearance for the commercial sale of any of its products under development,  the
Company must demonstrate  through  preclinical  studies and clinical trials that
the potential  product is safe and efficacious for use in humans for each target
indication. The failure to

                                       11

<PAGE>


adequately  demonstrate  the safety and  efficacy  of a product  under  clinical
development could delay or prevent regulatory clearance of the potential product
and could have a material  adverse  effect on the Company.  The foregoing  risks
reflect the Company's early stage of development and the nature of the Company's
industry  and  potential  products.  Also  inherent  at the  Company's  stage of
development are a range of additional risks, including  uncertainties  regarding
protection   of  patents  and   proprietary   rights,   government   regulation,
competition, employee issues, manufacturing uncertainties, the Company's lack of
sales  and  marketing  capabilities,  uncertainty  of market  acceptance  of the
Company's  products,  and  uncertainties  regarding  pharmaceutical  pricing and
reimbursement.

                                       12

<PAGE>


                           PART II. OTHER INFORMATION


Item 5.       OTHER INFORMATION

         Charles M.  Hartman  resigned  from the  Company's  Board of  Directors
     effective July 30, 1998. This resignation reflects the normal transition of
     venture capital  representatives  of the board of directors of companies in
     which a venture  fund's  investment  stake has been  reduced as a result of
     distributing venture fund shares.

Item 6.       EXHIBITS AND REPORTS ON FORM 8-K

(a)           Exhibits

   Exhibit Number                 Description
   --------------                 -----------
      3.1              Restated Certificate of Incorporation (2)
      3.2(ii)          Bylaws of the Registrant (1)
      3.3              Certificate   of   Designation   of   Series   A   Junior
                         Participating Preferred Stock of the Registrant (3)
     10.74+            Collaboration Agreement, dated July 28, 1998, between the
                         Registrant,  SUGEN   International,   AG,   and   Taiho
                         Pharmaceutical Co., Ltd.
     27                Financial Data Schedule

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

     +                 The Registrant has requested  confidential treatment with
                         respect to portions of this Exhibit.
     (1)               Incorporated   by  reference  to   identically   numbered
                         exhibits filed in response to Item 16 "Exhibits" of the
                         Company's   Registration  Statement  on  Form  S-1,  as
                         amended (File Number 33-77074),  which became effective
                         October 4, 1994.
     (2)               Incorporated   by  reference  to   identically   numbered
                         exhibits filed in response to Item 14 "Exhibits" of the
                         Company's Annual Report of Form 10-K for the year ended
                         December 31, 1994.
     (3)               Filed as an exhibit to the Form 8-K Current  Report dated
                         July 26, 1995 and incorporated herein by reference.

(b)           Reports on Form 8-K

         No reports on Form 8-K were filed  during the quarter  ended  September
     30, 1998.

                                       13

<PAGE>


                                   SIGNATURES

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


Date: November  11, 1998                           SUGEN, Inc.
      ----------------------------------



By: /s/ Stephen Evans-Freke                    By: /s/ James L. Knighton
    ------------------------------------           -----------------------------
    Stephen Evans-Freke                            James L. Knighton
    Chairman of the Board and                      Senior Vice President and
    Principal Executive Officer                    Principal Financial Officer

                                       14

<PAGE>


                                   SUGEN, Inc. 
 
                                  EXHIBIT INDEX


  Exhibit Number                      Description
  --------------                      -----------
      3.1              Restated Certificate of Incorporation (2)
      3.2(ii)          Bylaws of the Registrant (1)
      3.3              Certificate   of   Designation   of   Series   A   Junior
                         Participating Preferred Stock of the Registrant (3)
     10.74+            Collaboration Agreement, dated July 28, 1998, between the
                         Registrant,  SUGEN   International,   AG,   and   Taiho
                         Pharmaceutical Co., Ltd.
     27                Financial Data Schedule

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

     +                 The Registrant has requested  confidential treatment with
                         respect to portions of this Exhibit.
     (1)               Incorporated   by  reference  to   identically   numbered
                         exhibits filed in response to Item 16 "Exhibits" of the
                         Company's   Registration  Statement  on  Form  S-1,  as
                         amended (File Number 33-77074),  which became effective
                         October 4, 1994.
     (2)               Incorporated   by  reference  to   identically   numbered
                         exhibits filed in response to Item 14 "Exhibits" of the
                         Company's Annual Report of Form 10-K for the year ended
                         December 31, 1994.
     (3)               Filed as an exhibit to the Form 8-K Current  Report dated
                         July 26, 1995 and incorporated herein by reference.

                                       15




                                            ***TEXT OMITTED AND FILED SEPARATELY
                                                CONFIDENTIAL TREATMENT REQUESTED
                                             UNDER 17 C.F.R. SS.SS.200.80(B)(4),
                                                            200.83 AND 240.24B-2


                             COLLABORATION AGREEMENT

         THIS COLLABORATION AGREEMENT (the "Agreement") is made and entered into
as of July 28, 1998 (the "Effective Date") by and among SUGEN,  Inc., a Delaware
corporation  having offices at 351 Galveston  Road,  Redwood City, CA 94063-4720
("SUGENUS"),  SUGEN  INTERNATIONAL,  AG, a Swiss  corporation,  with  offices at
Innere   Gueterstrasse   4,  6304   Zug,   Switzerland   ("SUGEN"),   and  TAIHO
PHARMACEUTICAL  CO.,  LTD.,  a  Japanese  corporation,  with  offices  at  1-27,
Kandanishiki-cho, Chiyoda-ku, Tokyo, 101 Japan ("Taiho").


                                    RECITALS

         WHEREAS,  SUGENUS, SUGEN and Taiho desire to collaborate in the further
development,  manufacture  and  commercialization  of  products  useful  for the
treatment and prevention of cancer by mediation of tumor angiogenesis; and

         WHEREAS,  SUGENUS  has  discovered  and  commenced  development  of two
proprietary   compounds  designated  SU5416  and  SU6668,  which  mediate  tumor
angiogenesis  and has granted to SUGEN rights to  commercialize  such  compounds
outside the United States; and

         WHEREAS,  SUGEN and SUGENUS have entered into a cost-sharing  agreement
(the  "Cost-Sharing   Agreement")  whereunder  SUGENUS  has  granted  rights  in
technology and  intellectual  property owned or controlled by SUGENUS outside of
the United States; and

         WHEREAS,  SUGEN is a wholly  owned  subsidiary  of SUGENUS,  which is a
leader in the research and  development  of small  molecule  drugs that modulate
intracellular signaling pathways, and

         WHEREAS,   Taiho  is  engaged   in  the   research,   development   and
commercialization of pharmaceutical products; and

         WHEREAS,  the  parties  intend  to engage in  activities  to  identify,
research and develop other  compounds that mediate tumor  angiogenesis  and that
may be useful in the treatment or prevention of cancer in humans;

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

1.       DEFINITIONS

         As  used  herein,  the  following  capitalized  terms  shall  have  the
following meanings:

                                       1.

<PAGE>


         1.1  "Affiliate"  shall  mean any  company  or  entity  controlled  by,
controlling,  or under  common  control  with a party  hereto and shall  include
without limitation any company fifty percent (50%) or more of whose voting stock
or participating profit interest is owned or controlled, directly or indirectly,
by a party,  and any company  which owns or  controls,  directly or  indirectly,
fifty percent (50%) or more of the voting stock of a party.

         1.2 "Bulk  Compound"  shall  mean the  active  ingredient  of SU5416 or
SU6668 appropriate for use in the manufacture of a Product.

         1.3  "Clinical  Trial Cost"  shall have the  meaning  assigned to it in
Exhibit C.

         1.4 "Collaboration" shall have the meaning provided in Section 2.1.

         1.5  "Collaboration  Know-How"  shall  mean  any  and all  tangible  or
intangible  know-how,  trade secrets,  inventions  (whether or not  patentable),
data,  preclinical  and  clinical  results,  physical,  chemical  or  biological
material,  and other  information  that is both (a)  useful in the Field or that
relates  to SU5416 or SU6668 or  Products,  and (b) in any way  derived  from or
developed  pursuant to  activities  undertaken  by either  Taiho or SUGEN in the
conduct of the Collaboration.

         1.6 "Collaboration Patents" shall mean all foreign and domestic patents
(including  extensions,  reissues,  re-examinations  and inventors  certificates
relating thereto) that issue from patent applications (including  substitutions,
provisionals,  divisionals,  continuations  and  continuations-in-part  of  such
applications)  that claim inventions in the Collaboration  Know-How and that are
filed by or on behalf of one or both of Taiho or SUGEN.

         1.7 "Collaboration Technology" shall mean the Collaboration Patents and
the Collaboration Know-How.

         1.8  "Collaboration  Term"  shall mean the period  commencing  upon the
Effective Date and ending on  [...***...],  or on such later date as the parties
may mutually agree, during which the parties shall conduct the Collaboration.

         1.9  "Confidential  Information"  shall mean each party's  confidential
information,   inventions,   know  how  or  data  disclosed   pursuant  to  this
Collaboration  Agreement,   including  without  limitation  technical,  business
development manufacturing,  marketing,  financial,  personnel and other business
information  and  plans,  and the  terms  of this  Agreement,  whether  in oral,
written, graphic or electronic form.

         1.10  "Development  Plan" shall mean the plan  established  pursuant to
Section 3.1 governing the  development of Products,  including,  but not limited
to, all aspects of preclinical and clinical development.

- -----------------------
*    Confidential Treatment Requested

                                       2.

<PAGE>


         1.11  "Field"  shall mean the  prevention  and  treatment  of cancer in
humans by mediating Tumor Angiogenesis [...***...].

         1.12 "IND" shall mean an  Investigational  New Drug  Application  filed
with  the  United  States  Food  and  Drug  Administration,  or  the  equivalent
application or filing  necessary to commence  human  clinical  trials in another
country, as applicable.

         1.13  "Jointly  Funded  Trials"  shall have the meaning  given to it in
Section 3.6.

         1.14 "JWP  Sales"  shall  mean,  with  respect to sales of  Products by
Taiho, its Affiliates and sublicensees,  all revenues  calculated by [...***...]
of a Product.

         1.15 "JWP Selling Price" shall mean the per unit price, at which Taiho,
its Affiliates and sublicensees [...***...].

         1.16  "NDA"  shall  mean a New Drug  Application  filed with the United
States Food and Drug  Administration,  or the  equivalent  application  filed in
another country or supranational authority.

         1.17 "Phase I" means those  clinical  trials on  sufficient  numbers of
normal  volunteers  and patients that are designed to establish  safe drug doses
and to support testing in Phase II Clinical Trials.

         1.18 "Phase I/II" means those clinical trials on sufficient  numbers of
patients which incorporate elements of both Phase I and Phase II clinical trials
and are intended to support further clinical testing.

         1.19 "Phase II" means those  clinical  trials on sufficient  numbers of
patients that are designed to establish the safety and biological  activity of a
drug for its  intended  use,  and to define  warnings,  precautions  and adverse
reactions  that  are  associated  with  the  drug  in  the  dosage  range  to be
prescribed.

         1.20 "Phase III" means those trials on  sufficient  numbers of patients
that are  designed  to  establish  that a drug is safe and  efficacious  for its
intended use, and to define warnings, precautions and adverse reactions that are
associated  with the drug in the dosage range to be  prescribed,  and supporting
Regulatory Approval of such drug or label expansion of such drug.

         1.21 "Product" shall mean any pharmaceutical  product containing SU5416
or SU6668 for use in the Field, and including all formulations, line extensions,
or modes of administration thereof.

         1.22 "Regulatory  Approval" shall mean any and all approvals (including
price and reimbursement approvals),  licenses,  registrations, or authorizations
of any country, federal, state

- -----------------------
*    Confidential Treatment Requested

                                       3.

<PAGE>


or local regulatory agency,  department,  bureau or other government entity that
is necessary for the manufacture, use, storage, import, transport and/or sale of
a Product in a country.

         1.23 "Shared  Expenses" shall mean the aggregate  costs  [...***...] in
performing  [...***...] and  [...***...]  completed after the Effective Date and
required by the Development Plan.

         1.24   "SU5416"   shall  mean  the  compound  with  the  chemical  name
[...***...], designated by SUGENUS as SU005416.

         1.25   "SU6668"   shall  mean  the  compound  with  the  chemical  name
[...***...], designated by SUGENUS as SU006668.

         1.26 "SUGEN  Know-How"  shall mean,  to the extent useful in the Field,
tangible or  intangible  know-how,  trade  secrets,  inventions  (whether or not
patentable),  data,  preclinical  and clinical  results,  physical,  chemical or
biological material, and other information that SUGEN owns, controls or to which
it has a license (with the right to sublicense or  subcontract) on the Effective
Date, and any replication or any part of such information or material.

         1.27 "SUGEN Patents" shall mean, to the extent useful in the Field, all
foreign and domestic:  (a) patents issued and existing as of the Effective Date;
and (b)  patents  issuing  from patent  applications  that are pending as of the
Effective   Date   (including    substitutions,    provisionals,    divisionals,
continuations  and   continuations-in-part   of  such  applications);   and  (c)
extensions, reissues, re-examinations and inventors certificates relating to the
foregoing patents, which, in each case, SUGEN owns or controls or to which SUGEN
has a license  (with the right to  sublicense  or  subcontract).  SUGEN  Patents
existing as of the Effective Date include the patents and applications listed in
Exhibit B attached hereto.

         1.28  "SUGEN  Technology"  shall  mean  the  SUGEN  Patents  and  SUGEN
Know-How.

         1.29 "Sugen  Territory" shall mean all countries and territories in the
world, other than the Taiho Territory.

         1.30 "Taiho  Know-How"  shall mean,  to the extent useful in the Field,
tangible or  intangible  know-how,  trade  secrets,  inventions  (whether or not
patentable),  data,  preclinical  and clinical  results,  physical,  chemical or
biological material, and other information that Taiho owns, controls or to which
it has a license (with the right to sublicense or  subcontract) on the Effective
Date, and any replication or any part of such information or material.

         1.31 "Taiho Patents" shall mean, to the extent useful in the Field, all
foreign and domestic:  (a) patents issued or existing as of the Effective  Date;
and (b)  patents  issuing  from patent  applications  that are pending as of the
Effective   Date   (including    substitutions,    provisionals,    divisionals,
continuations  and   continuations-in-part   of  such  applications);   and  (c)
extensions, reissues, re-examinations and inventors certificates relating to the
foregoing patents,

- -----------------------
*    Confidential Treatment Requested

                                       4.

<PAGE>


which,  in each case,  Taiho owns or  controls  or to which  Taiho has a license
(with the right to sublicense or subcontract).

         1.32  "Taiho  Technology"  shall  mean  the  Taiho  Patents  and  Taiho
Know-How.

         1.33 "Taiho  Territory" shall mean Japan and such additional  countries
if they are added as provided in Section 5.3.

         1.34 "Third  Party"  shall mean any person or entity  other than Taiho,
SUGEN and SUGENUS, and their respective Affiliates.

         1.35 "Tumor  Angiogenesis"  shall mean the formation of a microvascular
network that supplies blood to a tumor.

         1.36 "Valid  Claim" shall mean a claim of (a) an issued  patent,  which
claim has not lapsed,  been  disclaimed or become  abandoned and which claim has
not been declared invalid or unenforceable by a court of competent  jurisdiction
in a decision from which no appeal has or can be taken,  or (b) a pending patent
application, which claim has not been abandoned or canceled.

2.       COLLABORATION SCOPE AND GOVERNANCE

         2.1 Scope of the  Collaboration.  The parties  intend to collaborate in
the research, development,  manufacture and commercialization of Products in the
Field, and in the research and development of Candidate Compounds as provided in
this  Agreement  (the  "Collaboration").  Taiho  acknowledges  that SUGENUS will
perform for SUGEN activities under the Collaboration  with a view to the sale of
Products.

         2.2 Research Management  Committee.  Promptly after the Effective Date,
the  parties  will  form  a  Research  Management  Committee  ("RMC")  comprised
[...***...].  One member of the RMC shall be selected to act as the  chairperson
of the RMC,  with each  chairperson  acting  for a term of twelve  (12)  months.
[...***...].  All decisions of the RMC shall be unanimous. The RMC shall meet on
a quarterly  basis or at such other  frequency  as the RMC  agrees.  The parties
shall   agree  upon  the  time  and  place  of   meetings,   substitutions   and
qualifications  of RMC members,  and other similar  matters.  Within thirty (30)
days after each  meeting,  the RMC  chairperson  will provide the parties with a
written   report   describing,   in  reasonable   detail,   the  status  of  the
Collaboration,  a summary  of the  results  and  progress  to date,  the  issues
requiring resolution, and the agreed resolution of previously reported issues. A
reasonable number of additional  representatives  of a Party may attend meetings
of the RMC in a non-voting capacity.

         2.3 Research Management Committee Functions and Powers. The RMC shall:

                  (1)      determine the specific goals for the Collaboration,

                  (2)      define, establish and execute the Development Plan,

- -----------------------
*    Confidential Treatment Requested

                                       5.

<PAGE>


                  (3)      manage   the   ongoing   research   and   development
                           activities conducted under the Collaboration, and

                  (4)      monitor the progress and results of such work.

To assist it in achieving Collaboration goals, the RMC shall:

                  (1)      establish,   as   needed,   working   groups   on   a
                           project-by-project      basis      consisting      of
                           representatives of both Taiho and SUGEN;

                  (2)      set the objectives for such working groups;

                  (3)      monitor their progress in meeting such objectives

                  (4)      encourage and facilitate ongoing  cooperation between
                           SUGEN and Taiho;

                  (5)      establish,  update and review plans for accomplishing
                           Collaboration goals;

                  (6)      allocate tasks and coordinate  activities required to
                           perform the Collaboration;

                  (7)      monitor the progress of the Collaboration and SUGEN's
                           and  Taiho's   diligence   in   carrying   out  their
                           responsibilities thereunder; and

                  (8)      carry  out  the  other  duties  and  responsibilities
                           assigned to it in this Agreement.

         2.4 Information and Reports.  Except as otherwise  provided,  SUGEN and
Taiho will make available and disclose to one another,  as requested by the RMC,
all results of the work conducted pursuant to the Collaboration  prior to and in
preparation  for RMC meetings in a form and format to be  designated by the RMC.
All such information and reports shall be provided in English.

         2.5 RMC Dispute  Resolution.  If the RMC is unable to decide or resolve
an issue  unanimously,  either Taiho or SUGEN may refer such issue to the senior
executives  of each of SUGEN and Taiho or a designee  thereof,  who shall not be
members  of the RMC.  Such  officers  of Taiho  and  SUGEN  will  meet  promptly
thereafter  and shall  negotiate  in good faith to resolve  such issue.  If they
cannot   resolve  the  issue  within  thirty  (30)  days  of   commencing   such
negotiations, the issue shall be resolved as provided in Section 13.2.

3.       DEVELOPMENT OF PRODUCTS

         3.1 Development of Products. SUGEN and Taiho have attached as Exhibit A
a summary of their  responsibilities  for  development of Products.  The RMC may
amend Exhibit A by written  agreement  from time to time. As provided in Section
2.3,  the  RMC  shall  establish  a  more  detailed  Development  Plan  for  the
development of Products,  which Development Plan shall reflect the allocation of
responsibilities provided in Exhibit A, as amended from time to time.

                                       6.

<PAGE>


During  the  Collaboration  Term,  SUGEN and  Taiho  shall  perform  development
activities assigned to them pursuant to the Development Plan.

         3.2 Disclosure of Study Data.  SUGEN and Taiho agree to keep each other
fully informed on a reasonable basis of the development and commercialization of
Products, including but not limited to providing periodic written updates on the
progress of each filing for Regulatory Approval. In particular,  each such party
shall  transfer to the other party promptly upon request data,  information  and
results  of  non-clinical  studies  performed  pursuant  to  the  Collaboration.
Additionally,  SUGEN  shall  provide  to Taiho a copy of data,  information  and
results  generated  during  those  Phase I clinical  trials and for which  Taiho
reimburses a portion of SUGEN's  Clinical  Trial Costs  pursuant to Section 3.6,
and Taiho shall  provide to SUGEN a copy of  information  and results  generated
during any non-clinical and clinical studies conducted by Taiho. [...***...]. If
SUGEN, however, [...***...] in an amount equal to [...***...].

         3.3 Non-Clinical Supply of Products.  SUGEN will supply SU5416,  SU6668
or  Products  to Taiho  [...***...]  for  SUGEN's  and  Taiho's  performance  of
non-clinical studies under the Development Plan.

         3.4  Clinical  Supply of  Products.  SUGEN  shall  manufacture  or have
manufactured Products in reasonable quantities necessary for clinical studies of
Products,  as required under the Development Plan. The cost of manufacturing and
supplying  such Products for clinical  trials shall be shared by SUGEN and Taiho
as provided in Section 3.6.

         3.5   Non-Clinical   Development   Expenses.   SUGEN  and  Taiho  shall
[...***...] of the Shared Expenses for each Product.  Taiho and SUGEN each shall
provide  to the other on a  quarterly  basis a summary  of the  Shared  Expenses
incurred by such party during the prior  calendar  quarter,  no later than forty
five (45) days after the end of such quarter. If during a given calendar quarter
such a party's Shared  Expenses  [...***...]  incurred by each party during such
calendar  quarter.  For  all  other  expenses  of  non-clinical  development  of
[...***...],  the party  performing such activities  shall bear all expenses for
such activities, unless otherwise agreed by such parties.

         3.6 Reimbursement of Clinical Trial Costs.

                  (a)  SUGEN  shall  be  responsible  for  costs  of  conducting
clinical  trials  of  Products  outside  of  the  Taiho  Territory,  subject  to
reimbursement by Taiho as provided below. If Taiho conducts  clinical trials for
Products in the Taiho Territory, it shall be solely responsible for all costs of
such trials.

                  (b) Taiho shall  reimburse  SUGEN  [...***...] of the Clinical
Trial Costs of conducting (i) any  [...***...],  together with (ii)  [...***...]
(collectively, the "Jointly Funded Trials").

- -----------------------
*    Confidential Treatment Requested

                                       7.

<PAGE>


                  (c) Taiho may  [...***...]  during the performance of clinical
trials [...***...],  and [...***...].  If the Supplemental  Information is to be
used [...***...] then the Supplemental  Information shall be provided in summary
form [...***...] for such use in an amount equal to [...***...].  SUGEN will use
commercially  reasonable  efforts to support Taiho's  regulatory  filings in the
Taiho Territory.

                  (d) Taiho  shall make any  payments  due to SUGEN  pursuant to
this Section 3.6 within  thirty (30) days after  receipt of an invoice  therefor
from SUGEN.

         3.7 Exclusivity. SUGEN and Taiho each acknowledge and agree that during
the term of this Agreement,  they will not directly or indirectly market or sell
in the other  party's  territory  any product  competitive  with Products in the
Field other than Products acquired by SUGEN pursuant to Sections 5.4 or 12.3.

4.       SUPPLY OF BULK COMPOUND OR PRODUCTS

         4.1 SUGEN  Manufacturing  Option.  For each Product,  SUGEN may, in its
sole  discretion,  elect whether it will  manufacture  and supply to Taiho,  its
Affiliates or sublicensees  either Bulk Compound or finished Product for sale in
the Taiho  Territory.  SUGEN will confer with Taiho prior to making any election
pursuant to this  Article 4. In the event SUGEN  elects not to  manufacture  and
supply to Taiho, its Affiliates or sublicensees either Bulk Compound or finished
Product,  then Taiho shall  manufacture or have  manufactured  Bulk Compound and
finished  Product  for  commercial  supply at its sole  expense,  and SUGEN will
receive the royalty on JWP Sales of Products provided for in Section 6.4. In the
event SUGEN  elects to  manufacture  and supply Bulk  Compound,  it will receive
Supply  Price  payments as provided  in Section  6.5. In the event SUGEN  elects
hereunder to manufacture  and supply finished  Products,  it will receive Supply
Price  payments as provided for in Section 6.6. SUGEN must make this election by
providing  written notice to Taiho at least  [...***...]  prior to the projected
date that the RMC  specifies  for filing the first  application  for  Regulatory
Approval for such Product in the Taiho Territory.

         4.2  Manufacturing  and Supply  Agreement for Bulk  Compound.  If SUGEN
elects  pursuant to Section 4.1 to manufacture  and supply Bulk  Compound,  then
immediately  after such  election is made,  SUGEN and Taiho shall  negotiate and
enter into a manufacturing and supply agreement  governing the commercial supply
of such Bulk Compound.  Such  manufacturing  and supply  agreement shall provide
that SUGEN will be  appointed  as the  exclusive  supplier  of Bulk  Compound to
Taiho, its Affiliates or  sublicensees,  and shall contain the payment terms set
forth in Section  6.5 and  Section  6.7,  in addition to such other terms as are
typically  contained  in  agreements  for the  manufacture  and  supply  of bulk
compound for the manufacture of  pharmaceutical  products  similar in nature and
market potential to such Product.

         4.3 Manufacturing  and Supply Agreement for Finished Product.  If SUGEN
elects  pursuant  to Section  4.1 to  manufacture  and supply to Taiho  finished
Product, then immediately

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after such  election is made,  SUGEN and Taiho shall  negotiate and enter into a
manufacturing  and supply  agreement  governing  the  commercial  supply of such
Product.  Such  manufacturing and supply agreement shall provide that SUGEN will
be appointed as the exclusive  supplier of such finished  Product to Taiho,  its
Affiliates  or  sublicensees,  and shall  contain the payment terms set forth in
Section  6.6 and Section  6.7, in addition to such other terms as are  typically
contained  in  agreements  for the  manufacture  and  supply  of  pharmaceutical
products of similar in nature and market potential to such Product.

5.       LICENSE GRANTS AND GRANTS TO INTELLECTUAL PROPERTY; EXCLUSIVITY

         5.1 Research and Development Licenses.

                  (a)  Grant by  SUGEN.  SUGEN  hereby  grants  to Taiho and its
Affiliates  during  the  term  of  this  Agreement  a  nonexclusive,  worldwide,
royalty-free   license   under  the  SUGEN   Technology   and  its  interest  in
Collaboration Technology, solely to the extent necessary or appropriate to carry
out Taiho's responsibilities under the Collaboration.

                  (b)  Grant by  Taiho.  Taiho  hereby  grants  to SUGEN and its
Affiliates  during  the  term  of  this  Agreement  a  nonexclusive,  worldwide,
royalty-free   license   under  the  Taiho   Technology   and  its  interest  in
Collaboration Technology, solely to the extent necessary or appropriate to carry
out SUGEN's responsibilities under the Collaboration.

                  (c) Sublicensing. Taiho and SUGEN each shall have the right to
grant  sublicenses  under the license granted to it pursuant to this Section 5.1
to Affiliates and Third Parties to the extent  necessary or appropriate to carry
out its responsibilities under the Collaboration.  Each such sublicense shall be
on terms substantially consistent with those provided in this Agreement.

         5.2 Commercialization Licenses.

                  (a) Grant by SUGEN.  Subject to the other  provisions  of this
Agreement,  SUGEN hereby grants to Taiho and its  Affiliates  during the term of
this Agreement an exclusive,  royalty-bearing license under the SUGEN Technology
and its interest in  Collaboration  Technology to use, sell,  offer for sale and
import Products in the Taiho  Territory.  If SUGEN elects not to manufacture and
supply to Taiho  either Bulk  Compound or finished  Product  pursuant to Section
4.1,  the  foregoing  commercialization  license to Taiho shall also include the
right to manufacture or have  manufactured Bulk Compound and finished Product in
the Taiho  Territory.  If SUGEN elects to  manufacture  and supply to Taiho Bulk
Compound  pursuant to Section 4.1, the foregoing  license granted to Taiho shall
also include the right to manufacture or have manufactured finished Product from
Bulk Compound supplied by SUGEN to Taiho, its Affiliates or sublicensees.

                  (b) Grant by Taiho.  Subject to the other  provisions  of this
Agreement,  Taiho hereby grants to SUGEN and its  Affiliates  during the term of
this Agreement an exclusive, royalty-free license under the Taiho Technology and
its interest in Collaboration Technology to make and have made, use, sell, offer
for sale and import Products in the SUGEN Territory.

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                  (c) Sublicensing. Taiho and SUGEN each shall have the right to
grant  sublicenses  under the license granted to it pursuant to this Section 5.2
to Affiliates and to Third Parties; provided, however, that if either such party
or its Affiliate  grants a sublicense to a Third Party  pursuant to this Section
5.2(c),  it shall so notify  the other  and  provide  to the other a copy of the
agreement  governing such  sublicense.  Each such  sublicense  shall be on terms
substantially consistent with those provided in this Agreement.

         5.3  Right  of  First  Negotiation.  In  the  event  SUGEN  decides  to
collaborate  in the  commercialization  of Product in the Field in  [...***...],
SUGEN shall notify Taiho of its intention  and, if Taiho shall  promptly  notify
SUGEN  of its  desire  so to do,  negotiate  in  good  faith  with  Taiho  for a
reasonable time regarding such a potential collaboration with Taiho.

         5.4  Diligence  Obligations.  Taiho  shall  devote  the same  degree of
attention,  resources  and  diligence  to its efforts to  develop,  manufacture,
market  and sell  Products  as it devotes to its other  products  of  equivalent
economic  potential.  In the event  that Taiho  does not  [...***...],  then the
rights  granted to Taiho under this Article 5 with respect to such Product shall
terminate  and the rights  granted to SUGEN  pursuant to this Article 5 shall be
expanded to apply on a worldwide  basis with respect to such Product;  provided,
however, that in the event [...***...]. SUGEN shall notify Taiho promptly of the
approval of the first NDA for a Product in the SUGEN Territory.

         5.5 Transfer of Technology.  During the term of this  Agreement,  SUGEN
and Taiho each will provide the other party with reasonable technical assistance
relating to the use of such  party's  know-how  and the  practice of its patents
included in the SUGEN Technology or the Taiho  Technology,  as applicable in the
Field, solely to the extent permitted under the licenses granted herein.

6.       FEES AND PAYMENTS

         6.1 Initial Research Payment. On the Effective Date, Taiho shall pay to
SUGEN an initial  research  payment of $[...***...] for research and development
costs incurred by SUGEN prior to the Effective Date.

         6.2  Research  and  Development  Funding.  Taiho shall pay to SUGEN the
amounts set forth below to support SUGEN's  research and development  activities
under  the  Collaboration  during  each  year of the  Collaboration  Term.  Such
payments will be made on a [...***...],  except that the amount due [...***...].
Not later  than  March 31 of the year  following  the year for  which  each such
payment is made,  SUGEN will  furnish  Taiho a statement in respect of each such
payment setting forth in reasonable detail the work performed and costs incurred
by SUGEN.

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               Payment Period                          Amount Due

                 [...***...]                          [...***...]

                 [...***...]                          [...***...]

                 [...***...]                          [...***...]

                 [...***...]                          [...***...]

                 [...***...]                          [...***...]

                 [...***...]                          [...***...]

                 [...***...]                          [...***...]

         6.3  Milestone  Payments  to SUGEN.  Taiho will pay to SUGEN  milestone
payments in the amounts  listed  below,  within ten (10) business days after the
occurrence of the following events:


        Milestones           First Product*           Each Subsequent Product**

Start of [...***...]          $[...***...]                  $[...***...]

Filing of [...***...]         $[...***...]                  $[...***...]

[...***...]                   $[...***...]                  $[...***...]

* The amounts  listed in the middle  column are payable only with respect to the
first Product for which the specified milestone is achieved.

** The  amounts  listed in the right  column are  payable  with  respect to each
Product for which the specified  milestone is achieved  after Taiho has paid the
amount  due to  SUGEN  for the  first  Product  in the  middle  column  for such
milestone.

         6.4 Royalty.

                  (a)  Royalty.  If  SUGEN  elects  under  Section  4.1  not  to
manufacture and supply either Bulk Compound or finished Product, Taiho shall pay
SUGEN a royalty of [...***...] of JWP Sales of Products in the Taiho  Territory;
provided, however, [...***...].

                  (b) Third Party Royalties. [...***...] on the sale of Products
[...***...].

         6.5 Supply  Price for Bulk  Compound.  If SUGEN  elects to supply  Bulk
Compound for a given Product  pursuant to Section 4.1, Taiho, its Affiliates and
sublicensees  will pay to SUGEN a Supply Price for supply of such Bulk  Compound
equal to

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                           (1)  [...***...]  of the JWP Selling Price of Product
[...***...] following [...***...]; or

                           (2)  [...***...]  of the JWP Selling Price of Product
[...***...] following [...***...]; or

                           (3)  [...***...]  of the JWP Selling Price of Product
[...***...] as provided for in paragraph (2) above.

         6.6 Supply  Price for Finished  Product.  If SUGEN elects to supply the
finished form of a given Product  pursuant to Section 4.1, Taiho, its Affiliates
and  sublicensees  will pay to SUGEN a Supply  Price for supply of such  Product
equal to

                           (1)  [...***...]  of the JWP Selling Price of Product
[...***...] following [...***...]; or

                           (2)  [...***...]  of the JWP Selling Price of Product
[...***...] following ; [...***...] or

                           (3)  [...***...]  of the JWP Selling Price of Product
[...***...] as provided for in paragraph (2) above.

         6.7 Payments;  Reports.  If SUGEN elects not to manufacture either Bulk
Compound or finished  Product  pursuant to Section 4.1,  the royalty  obligation
under  Section 6.4 shall  accrue at the time of sale of the  Products to a Third
Party.  Royalty  obligations that accrue during a particular  quarter,  shall be
paid  within  [...***...]  after  the end of each  calendar  quarter,  and other
payments owing shall be made as specified herein.  Each payment of royalties and
amounts  due to SUGEN  under  Sections  6.5 and 6.6  shall be  accompanied  by a
statement of the amount of JWP Sales during such period on a  product-by-product
basis, and all other information  necessary to determine the appropriate  amount
of such payments,  and any additional  information or reports required under the
Agreement.  If SUGEN elects to manufacture  and supply to Taiho,  its Affiliates
and sublicensees either Bulk Compound or finished Product, the manufacturing and
supply  agreement to be negotiated  by SUGEN and Taiho,  pursuant to Section 4.3
shall specify the payment and Taiho's  reporting  requirements  for Supply Price
payments due to SUGEN on the JWP Selling Price of Products.

         6.8 Currency. The amounts due to SUGEN pursuant to Sections [...***...]
shall be paid in  [...***...].  The  amounts  due to SUGEN  pursuant to Sections
[...***...] shall be paid in [...***...].

         6.9  Records  and Audit.  During the term of this  Agreement  and for a
period of [...***...] thereafter, Taiho shall keep complete and accurate records
pertaining to the sale or other  disposition of the Products  commercialized  by
it, in sufficient detail to permit SUGEN to confirm the accuracy of all payments
due hereunder. SUGEN shall have the right to cause an

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independent,  certified  public  accountant  to audit  such  records  to confirm
Taiho's  JWP Sales,  JWP  Selling  Price,  royalty  payments  and  Supply  Price
payments, as applicable; provided, however, that such auditor shall not disclose
Taiho's Confidential  Information to SUGEN, except to the extent such disclosure
is necessary to verify the amount of royalties and other payments due under this
Agreement.  Such audit  rights may be  exercised  [...***...]after  the  royalty
period to which the  relevant  records  relate,  upon prior  notice to Taiho and
during normal business hours. Any amounts shown to be owing by such audits shall
be paid  immediately  with interest in the amount of  [...***...]  from the date
first owed until paid.  SUGEN shall bear the full cost of such audit unless such
audit discloses a variance in the amounts paid by Taiho of more than [...***...]
from the amount of royalties and/or other payments  actually owed. In such case,
Taiho shall bear the full cost of such audit.  The terms of this  Section  shall
survive  any  termination  or  expiration  of this  Agreement  for a  period  of
[...***...].

         6.10  Withholding of Taxes.  Taiho and SUGEN agree that the [...***...]
may  be  treated  by  [...***...].  Taiho  and  SUGEN  agree  that  [...***...].
Notwithstanding the foregoing,  if [...***...],  it shall provide to [...***...]
appropriate documentation with respect thereto.

7.       THIRD GENERATION PRODUCTS

         7.1 General. In the event Taiho and SUGEN agree that neither SU5416 nor
SU6668 can be successfully developed as an oral product such parties may wish to
conduct a  development  program in the Field to identify one or more  additional
compounds  for  development  as Products.  Such a  development  program would be
conducted  pursuant to a workplan mutually agreeable to such parties which would
set forth the project objectives,  the activities to be undertaken by each party
and the  responsibilities  of each such party for funding the costs to carry out
the workplan.

8.       OWNERSHIP; INTELLECTUAL PROPERTY

         8.1  Ownership.  Taiho  acknowledges  and  agrees  that  SUGEN  or  its
Affiliates  is and  shall  remain  the sole  owner of the SUGEN  Technology  and
SUGEN's  interest in the  Collaboration  Technology and that Taiho has no rights
therein  other  than the  license  rights  specifically  granted  herein.  SUGEN
acknowledges  and agrees that Taiho or its  Affiliates  is and shall  remain the
sole owner of the Taiho  Technology  and Taiho's  interest in the  Collaboration
Technology  and that SUGEN has no rights  therein other than the license  rights
specifically granted herein.

         8.2 Ownership of  Technology.  Inventorship  with respect to inventions
made pursuant to work carried out under the Collaboration shall be determined in
accordance  with United States rules of  inventorship.  Taiho and SUGEN or their
Affiliates  shall each own solely all inventions made solely by their employees,
agents and  consultants,  and such parties or their Affiliates shall own jointly
all inventions  jointly made by employees,  agents and  consultants of both such
parties hereunder;  provided,  however,  that intellectual  property rights with
respect to inventions  relating to compounds  derived from SU5416 or SU6668,  or
the use thereof, regardless of the identity of

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the inventor,  shall be solely owned by or assigned to SUGEN or its  Affiliates.
Any assignments  necessary to accomplish the foregoing are hereby made and Taiho
will execute such further documents as may be reasonably requested by SUGEN with
respect thereto.

         8.3  Patent   Prosecution.   Taiho  Patents  and  SUGEN  Patents,   and
applications  therefore,  shall be filed, prosecuted and maintained by Taiho and
SUGEN or their Affiliates,  respectively,  at such party's option and at its own
expense; provided, however, that Taiho and SUGEN shall consult with and consider
the comments of the other party with respect to the  prosecution of applications
for SUGEN Patents and Taiho  Patents,  to the extent  licensed  under Article 6,
that are  pending  as of the  Effective  Date.  Applications  for  Collaboration
Patents  for  inventions  owned by or  assigned  to one such party  pursuant  to
Section  8.1  above  shall  be  filed,  prosecuted  and  any  resulting  patents
maintained by such party,  at such party's option and its own expense.  SUGEN or
its Affiliates shall be responsible for filing and prosecuting applications for,
and  maintaining,  jointly  owned  Collaboration  Patents,  using counsel of its
choice, throughout the world. Taiho shall reimburse SUGEN for [...***...] of all
expenses  SUGEN incurs for filing  applications  for, and  maintenance  of, such
jointly-owned  Collaboration Patents worldwide.  In the event that SUGEN decides
not  to  proceed  with  prosecuting  an  application  for,  or  maintaining,   a
Collaboration  Patent for which it is  responsible  under this  Section  8.3, it
shall  give Taiho  sixty (60) days'  notice  before any  relevant  deadline  and
transmit  all   information   reasonable  and   appropriate   relating  to  such
Collaboration  Patent,  and  Taiho or its  Affiliates  shall  have the  right to
pursue, at its own expense,  prosecution of such application for, or maintenance
of, such  patent,  in which  event SUGEN shall  assign all of its rights in such
patent to Taiho.

         8.4 Disclosure of Inventions. SUGEN and Taiho will disclose promptly to
each other all discoveries or inventions made hereunder,  including  discoveries
or inventions  made by employees,  consultants or contractors of SUGEN or Taiho,
respectively,  pursuant to the Collaboration,  prior to any public disclosure or
filing of patent  applications  and  allowing  sufficient  time for  comment and
review by the other party.

         8.5 Infringement of Patents by Third Parties.

                  (a)  Notice.  Taiho and SUGEN each shall  promptly  notify the
other in writing of any alleged or threatened  infringement of the Collaboration
Patents, SUGEN Patents or Taiho Patents which may adversely impact the rights of
the parties hereunder, of which it becomes aware.

                  (b) Cooperation.  Both Taiho and SUGEN agree that neither will
notify a Third Party (except for the parties'  outside  litigation  counsels) of
the  infringement  of any of the  Collaboration  Patents by a Third Party in the
Field without first obtaining the consent of the other such party, which consent
shall not be  unreasonably  denied.  Both such parties will  cooperate with each
other to terminate such infringement  without  litigation,  with each such party
being  responsible  for the payment of its own  out-of-pocket  costs  (including
legal  costs)  relating  thereto.   Any  monetary   settlement   reached  shall,
[...***...].

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                  (c)  Enforcement  Action.  In the event  that any  alleged  or
threatened  infringement  of the  Collaboration  Patents by a Third Party in the
Field in the Taiho  Territory  cannot be terminated  without  litigation,  Taiho
shall have the first right, but not the obligation,  to take appropriate  action
against  any  person  or  entity  directly  or  contributorily  infringing  such
Collaboration  Patent  in the  Taiho  Territory.  In the  event  Taiho  fails to
institute an infringement  suit or take other  reasonable  action in response to
such  infringement  within  ninety  (90) days after  notice in  accordance  with
paragraph (a) above,  SUGEN shall have the right,  but not the obligation,  upon
thirty  (30)  days'  notice  to  Taiho  to  institute  such  suit or take  other
appropriate action in its own name, the joint owners' names, or both. Regardless
of which such party  brings such  enforcement  action,  the other  party  hereby
agrees to  cooperate  reasonably  in any such  effort,  including,  if required,
bringing  a legal  action or  furnishing  a power of  attorney.  Such  party not
bringing  the action shall have the right to  participate  in such action at its
own expense  with its own counsel and any  recovery  obtained by  settlement  or
otherwise shall be disbursed as follows: Each such party shall first recover any
reasonable   expenses  incurred  in  such  action   (including   counsel  fees).
Thereafter, such parties shall [...***...]. Taiho Patents and SUGEN Patents will
be  defended  by Taiho and  SUGEN as  determined  by it in its sole  discretion,
respectively, throughout the world.

         8.6 Infringement of Third Party Patent Rights.

                  (a) Joint Strategy. In the event that the manufacture,  use or
sale of a Product  becomes the subject of a claim of  infringement  of a patent,
copyright or other proprietary right by a Third Party anywhere in the world, and
without regard to which party is charged with said  infringement,  and the venue
of such claim, Taiho and SUGEN shall promptly confer to discuss the claim.

                  (b) Defense.  Unless Taiho and SUGEN  otherwise  agree,  Taiho
shall  have the  first  right  but not the  obligation  to  assume  the  primary
responsibility  at its  expense for the conduct of the defense of any such claim
brought in the Taiho  Territory,  and SUGEN  shall  have the right,  but not the
obligation,  to  participate  in any such suit at its sole option and at its own
expense.  Each such party shall  reasonably  cooperate with the party conducting
the defense of the claim.  Unless such parties otherwise agree, SUGEN shall have
the first right but not the obligation to assume the primary  responsibility  at
its  expense  for the  conduct of the  defense of any such claim  brought in the
SUGEN  Territory.  Neither Taiho nor SUGEN shall enter into any settlement  that
affects the other such party's  rights or interests  without such other  party's
written consent, not to be unreasonably withheld.

         8.7 Patent  Marking.  Taiho  shall mark,  if  necessary,  all  products
manufactured,  used  or  sold  under  the  terms  of this  Agreement,  or  their
containers, in accordance with the applicable patent marking laws, as required.

9.       CONFIDENTIALITY

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         9.1 Confidentiality.  Except to the extent expressly authorized by this
Agreement or otherwise agreed in writing by the parties, each party agrees that,
for the term of this  Agreement and for  [...***...]  thereafter,  it shall keep
confidential  and shall not publish or otherwise  disclose and shall not use for
any  purpose  other than as  provided  for in this  Agreement  any  Confidential
Information furnished to it by the other party pursuant to this Agreement unless
the  receiving  party can  demonstrate  by  competent  written  proof  that such
Confidential Information:

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

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

                  (c) 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;

                  (d) was disclosed to the receiving party,  other than under an
obligation  of  confidentiality  to a Third  Party,  by a Third Party who had no
obligation to the disclosing  party not to disclose such  information to others;
or

                  (e) was independently discovered or developed by the receiving
party without the use of  Confidential  Information  belonging to the disclosing
party.

         9.2  Authorized  Disclosure.   Each  party  may  disclose  Confidential
Information  belonging  to the other  party to the  extent  such  disclosure  is
reasonably necessary in the following instances:

                  (a) filing or prosecuting patents relating to Products;

                  (b) regulatory filings;

                  (c) prosecuting or defending litigation;

                  (d) complying with applicable governmental regulations;

                  (e) conducting  pre-clinical  or clinical  trials of Products;
and

                  (f)   disclosure  to  Affiliates,   sublicensees,   employees,
consultants  or agents who are bound by  similar  terms of  confidentiality  and
non-use at least equivalent in scope to those set forth in this Article 12.

         Notwithstanding the foregoing, in the event a party is required to make
a disclosure  of the other  party's  Confidential  Information  pursuant to this
Section 9.2, it will, give advance notice to

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the  other  party of such  disclosure  and  endeavor  in good  faith  to  secure
confidential treatment of such information.

         9.3  Publications.  If a party  desires  to  publish  a paper or make a
presentation  relating  to the  parties'  work  under  the  Collaboration  or to
Products,  whether  written or oral,  that party shall at least thirty (30) days
before submission of the proposed  publication or presentation to a Third Party,
submit such proposed  publication or  presentation  in written form to the other
party  for  review.  The  reviewing  party  will  determine  whether  any of its
confidential   information   that  may  be  contained  in  such  publication  or
presentation should be modified or deleted, and whether to propose that a patent
application should be filed on any invention  disclosed  therein.  The reviewing
party shall have thirty (30) days for written publications or seven (7) days for
abstracts  for oral  presentations  or  posters  in which to  review  each  such
proposed  publication or presentation.  The review period may be extended for an
additional  thirty (30) days if the  reviewing  party  reasonably  requests such
extension  to allow  time for the  preparation  and  filing of  relevant  patent
applications.  In no event  shall a party  publish or present  any  Confidential
Information of the other party without the written consent of that party.

10.      REPRESENTATIONS AND WARRANTIES

         10.1 Representations and Warranties. Each party represents and warrants
that:

                  (a) Corporate Power. It is duly organized and validly existing
under the laws of its state or country of incorporation,  and has full corporate
power and authority to enter into this Agreement and to carry out the provisions
hereof.

                  (b) Due  Authorization.  It is duly  authorized to execute and
deliver this Agreement and to perform its obligations  hereunder.  The person or
persons executing this Agreement on its behalf has been duly authorized to do so
by all requisite corporate action.

                  (c) Binding Agreement.  This Agreement is legally binding upon
it and  enforceable in accordance  with its terms.  The execution,  delivery and
performance of this  Agreement 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 material law or  regulation  of any court,  governmental
body or administrative or other agency having jurisdiction over it.

                  (d) Grant of Rights;  Maintenance of  Agreements.  It has not,
and will not during  this  Agreement,  grant any right to any Third  Party which
would conflict with the rights granted to the other party hereunder.  It has (or
will have at the time  performance is due) maintained and will maintain and keep
in full force and effect  all  agreements  (including  license  agreements)  and
filings   (including  patent  filings)  necessary  to  perform  its  obligations
hereunder.

                  (e)  Validity.  It is aware of no  action,  suit or inquiry or
investigation  instituted  by or before any court or  governmental  agency which
questions or threatens the validity of this Agreement.

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         10.2  SUGEN  Representations  and  Warranties.   SUGEN  represents  and
warrants that it owns or holds  licenses to the SUGEN Patents and SUGEN Know-How
and has  sufficient  rights and power to grant the  licenses  to Taiho  which it
purports to grant herein.

         10.3 SUGEN  Disclaimer.  EXCEPT AS SET FORTH IN SECTION 10.2 ABOVE, THE
SUGEN  TECHNOLOGY IS PROVIDED "AS IS" AND SUGEN EXPRESSLY  DISCLAIMS ANY AND ALL
WARRANTIES OF ANY KIND,  EXPRESS OR IMPLIED,  INCLUDING  WITHOUT  LIMITATION THE
WARRANTIES  OF  DESIGN,  MERCHANTABILITY,  FITNESS  FOR  A  PARTICULAR  PURPOSE,
NONINFRINGEMENT OF THE INTELLECTUAL  PROPERTY RIGHTS OF THIRD PARTIES OR ARISING
FROM A COURSE  OF  DEALING,  USAGE OR TRADE  PRACTICES,  WITH  RESPECT  THERETO.
Without  limiting the  generality of the  foregoing,  SUGEN  expressly  does not
warrant (i) the success of any  development  or  clinical  trial,  study or test
commenced by Taiho under this  Agreement,  or (ii) the safety or usefulness  for
any purpose of the Drug Candidates or the Licensed Technology.

         10.4 Taiho Representations,  Warranties and Covenants. Taiho represents
and  warrants  that it owns or holds  licenses  to the Taiho  Patents  and Taiho
Know-How  and has  sufficient  rights and power to grant the  licenses  to SUGEN
which it  purports  to grant  herein.  Taiho  agrees  that it shall not file any
opposition  with  any  government   authority  in  the  Taiho  Territory  having
jurisdiction  over  patent-related  matters  with respect to any SUGEN Patent or
Collaboration Patent.

         10.5 Taiho  Disclaimer.  EXCEPT AS SET FORTH IN SECTION 10.4 ABOVE, THE
TAIHO  TECHNOLOGY  IS PROVIDED AS IS AND TAIHO  EXPRESSLY  DISCLAIMS ANY AND ALL
WARRANTIES OF ANY KIND,  EXPRESSED OR IMPLIED,  INCLUDING WITHOUT LIMITATION THE
WARRANTIES  OF  DESIGN,  MERCHANTABILITY,  FITNESS  FOR  A  PARTICULAR  PURPOSE,
NONINFRINGEMENT OF THE INTELLECTUAL  PROPERTY RIGHTS OF THIRD PARTIES OR ARISING
FROM A COURSE  OF  DEALING,  USAGE OR TRADE  PRACTICES,  WITH  RESPECT  THERETO.
Without  limiting the  generality of the  foregoing,  Taiho  expressly  does not
warrant (i) the success of any  development  or  clinical  trial,  study or test
commenced  by it under this  Agreement,  or (ii)  regulatory  approval,  product
introduction, safety, usefulness or commercial success of any Product.

11.      INDEMNIFICATION

         11.1 Indemnification. Taiho and SUGEN each hereby agree to save, defend
and hold the other such party and its agents  and  employees  harmless  from and
against  any and all suits,  claims,  actions,  demands,  liabilities,  expenses
and/or loss,  including reasonable legal expense and attorneys' fees, other than
claims for  infringement  as provided in Section  8.6  (collectively,  "Claims")
resulting  directly or indirectly from actions by the  indemnifying  party,  its
Affiliates,  agents or sublicensees in connection with the  manufacture,  use or
sale of Products,  but only to the extent such Claims result from the negligence
or willful  misconduct of the indemnifying

                                      18.

<PAGE>


party or its  employees  and agents and only to the  extent  such  Claims do not
result  from  the  negligence  or  willful   misconduct  of  the  party  seeking
indemnification.

         11.2 Control of Defense.  Any entity entitled to indemnification  under
this Article shall give written notice to the  indemnifying  party of any Claims
that may be subject to indemnification,  promptly after learning of such Claims,
and the indemnifying  party shall assume the defense of such Claims with counsel
reasonably  satisfactory to the indemnified party. If such defense is assumed by
the indemnifying party with counsel so selected, the indemnifying party will not
be  subject to any  liability  for any  settlement  of such  Claims  made by the
indemnified party without its consent (but such consent will not be unreasonably
withheld or delayed),  and will not be obligated to pay the fees and expenses of
any  separate  counsel  retained by the  indemnified  party with respect to such
Claims.

12.      TERM AND TERMINATION OF AGREEMENT

         12.1 Term.  Except as provided  under  Section 12.2 below,  the term of
this  Agreement  shall  commence upon the  Effective  Date and shall expire on a
Product by Product basis on the later of (i) [...***...] of the first commercial
launch  of a  Product  in the  Taiho  Territory,  and  (ii)  [...***...]  of the
Effective Date. Upon expiration of this Agreement pursuant to this Section 12.1,
Taiho and SUGEN  each  shall  have a fully  paid,  exclusive  license to use any
Collaboration  Know-How to make,  have made, use and sell Products,  and a fully
paid,  nonexclusive  license  under the other's  interest  in the  Collaboration
Know-How for any other use within the Field.

         12.2 Termination for Material  Breach.  Taiho and SUGEN each shall have
the right to terminate the Agreement  for material  breach of this  Agreement by
the other upon  [...***...]  written notice to the other party, if such material
breach  remains  uncured upon the  expiration of such period of time;  provided,
however,  that such period of time shall be  extended  if such breach  cannot be
cured within such period,  for so long as the breaching  party  continues to use
diligent efforts to cure such breach until actually cured. Upon termination, all
licenses  granted to such  non-breaching  party shall  survive and all  licenses
granted  to  the  breaching  party  under  the  Agreement  shall   automatically
terminate,   but  such  termination  shall  not  impair  any  other  rights  the
non-breaching party may have at law or equity.

         12.3 Termination of Programs.

                  (a) Taiho shall have the right to terminate the  Collaboration
with respect to either SU5416 or SU6668. In the event of such  termination,  the
rights  granted to Taiho under  Article 5 with  respect to such  compound  shall
terminate  and the rights  granted to SUGEN under Article 5 with respect to such
compound  shall  survive  such  termination  and shall be expanded to apply on a
worldwide basis.

                  (b) Taiho shall have the right to terminate the  Collaboration
with respect to both SU5416 and SU6668 if:

- -----------------------
*    Confidential Treatment Requested

                                      19.

<PAGE>


                           (1)      (i)   in    [...***...]    both    compounds
[...***...]; or

                                    (ii) both compounds [...***...];

                           and

                           (2) [...***...] to address these problems.

         In the event Taiho  terminates the  Collaboration  with respect to both
SU5416 and  SU6668,  the  Agreement  shall  terminate  unless the  parties  have
mutually agreed to continue the Collaboration with respect to a third generation
product as provided for in Article 7. If the Agreement is terminated pursuant to
this  Section  12.3(b),  all  rights  granted  to Taiho  under  Article  5 shall
terminate  and all rights  granted to SUGEN under  Article 5 shall  survive such
termination and shall be expanded to apply on a worldwide basis.

         12.4  Accrued  Rights;  Surviving  Obligations.   Termination  of  this
Agreement  shall not affect any  accrued  rights of either  party.  The terms of
Sections 6.9, 8.1, 8.2, 12.3, 12.4, 14.4,  14.5,  14.7, 14.9,  14.10,  14.11 and
14.12,  Articles 1, 9, 10, 11 and 13 of this Agreement shall survive termination
of this Agreement. Promptly after termination of this Agreement each party shall
return or  dispose  of any  Confidential  Information  and other know how of the
other party in accordance with its instructions,  including  without  limitation
any compounds, assays or other biological or chemical materials.

13.      GOVERNING LAW; DISPUTE RESOLUTION

         13.1 Governing  Law. This Agreement  shall be governed by New York law,
excluding its choice of law rules.

         13.2 Dispute Resolution. In the event of any dispute, the parties shall
refer such  dispute to the  Chairman of the board of  directors of SUGEN and the
Chairman of the board of directors  of Taiho for  attempted  resolution  by good
faith  negotiations  within thirty (30) days after such referral is made. In the
event such  officers are unable to resolve such dispute  within such thirty (30)
day period, either party may invoke the provisions of Section 13.3 below.

         13.3 Jurisdiction and Venue.  Except as provided in Section 13.2 above,
any claim or  controversy  arising  out of or related to this  Agreement  or any
breach  hereof  shall be  submitted  to a state  or  federal  court  of  general
jurisdiction  in the State of New York,  and the parties  hereby  consent to the
jurisdiction and venue of such court.

14.      GENERAL PROVISIONS

         14.1 Notices.  All notices required or permitted to be given under this
Agreement  shall be in writing and shall be mailed by  registered  or  certified
mail,  Federal  Express or DHL addressed to the signatory to whom such notice is
required or  permitted  to be given and

- -----------------------
*    Confidential Treatment Requested

                                      20.

<PAGE>


transmitted  by facsimile to the number  indicated  below.  All notices shall be
deemed to have been given when mailed, as evidenced by the postmark at the point
of mailing, or faxed.

         All notices to Taiho shall be addressed as follows:

                  Taiho Pharmaceutical Co., Ltd.
                  1-27, Kandanishiki-cho
                  Chiyoda-ku, Tokyo, 101 Japan
                  Attention:  President of the Board
                  Fax:  03-3233-4318

         All notices to SUGENUS shall be addressed as follows:

                  SUGEN, Inc.
                  531 Galveston Road
                  Redwood, City, CA 94063-4720
                  Attention:  Chairman of the Board
                  Fax:  (650) 369-0913

         All notices to SUGEN shall be addressed as follows:

                  SUGEN International, AG
                  c/o Acton Treuhand, AG
                  Innere Gueterstrasse 4
                  6304 Zug
                  Switzerland
                  Attention:  President of the Board

         Any party may, by written notice to the other,  designate a new address
or fax number to which  notices to the party giving the notice shall  thereafter
be mailed or faxed.

         14.2 Compliance  with Laws.  Taiho and SUGEN shall review in good faith
and cooperate in taking  actions to ensure the compliance of this Agreement with
all  applicable  laws.  Taiho and SUGEN shall each  provide the other such party
with such reasonable assistance as may be required for the party requesting such
assistance to comply with all laws, ordinances,  rules, regulations and the like
of all  governmental  units or agencies having  jurisdiction  pertaining to this
Agreement, including without limitation,  obtaining all import, export and other
permits,  certificates,  licenses or the like required by such laws, ordinances,
rules,  regulations  and the like,  necessary  to permit the  parties to perform
hereunder and to exercise their respective rights hereunder.

         14.3 Force  Majeure.  No party shall be liable for any delay or failure
of  performance  to the extent such delay or failure is caused by  circumstances
beyond its  reasonable  control and that by the exercise of due  diligence it is
unable to prevent, provided that the party claiming excuse uses its best efforts
to overcome the same.

                                      21.

<PAGE>


         14.4 Entirety of Agreement.  This Agreement embodies the entire,  final
and complete  agreement and  understanding  between the parties and replaces and
supersedes all prior discussions and agreements between them with respect to its
subject  matter.  No  modification  or waiver of any terms or conditions  hereof
shall be  effective  unless  made in  writing  and  signed by a duly  authorized
officer of each party.

         14.5 Non-Waiver. The failure of a party in any one or more instances to
insist  upon  strict  performance  of any of the  terms and  conditions  of this
Agreement shall not constitute a waiver or relinquishment, to any extent, of the
right to  assert  or rely  upon  any such  terms  or  conditions  on any  future
occasion.

         14.6  Disclaimer of Agency.  None of the parties is, nor will be deemed
to be, the legal  representative or agent of the other, nor shall any party have
the right or authority to assume,  create, or incur any Third Party liability or
obligation  of any kind,  express  or  implied,  against or in the name of or on
behalf of another except as expressly set forth in this Agreement.

         14.7 Severability.  If a court of competent  jurisdiction  declares any
provision of this Agreement  invalid or  unenforceable,  or if any government or
other agency having  jurisdiction over either SUGEN or Taiho deems any provision
to be  contrary  to any  laws,  then that  provision  shall be  severed  and the
remainder  of the  Agreement  shall  continue in full force and  effect.  To the
extent possible, the parties shall revise such invalidated provision in a manner
that will render such provision  valid without  impairing the parties'  original
intent.

         14.8 Affiliates;  Assignment. Except as otherwise provided herein, none
of the parties may assign its rights or delegate its duties under this Agreement
without the prior  written  consent of the other party,  not to be  unreasonably
withheld;  provided,  however,  that any party may assign its rights or delegate
its duties under this  Agreement to any of its Affiliates or to any successor by
merger or sale of  substantially  all of its  business  to which this  Agreement
relates in a manner such that the assignor  will remain  liable and  responsible
for the performance and observance of all its duties and obligations  hereunder.
This Agreement shall be binding upon the successors and permitted assigns of the
parties.  Any attempted  delegation or  assignment  not in accordance  with this
Section 14.8 shall be of no force or effect.

         14.9 Headings. The headings contained in this Agreement have been added
for convenience only and shall not be construed as limiting.

         14.10 Limitation of Liability.  No party shall be liable to another for
indirect,  incidental,  consequential  or  special  damages,  including  but not
limited  to  lost  profits,  arising  from or  relating  to any  breach  of this
Agreement,  regardless of any notice of the possibility of such damages. Nothing
in this Section is intended to limit or restrict the  indemnification  rights or
obligations of any party.

         14.11  Counterparts.  This  Agreement  may be  executed  in one or more
counterparts,  each  of  which  shall  be an  original  and all of  which  shall
constitute together the same document.

                                      22.

<PAGE>


         14.12 English Language. This Agreement has been prepared in the English
language and shall be construed in the English language.

         14.13  Public  Announcement.  Except for such  disclosure  as is deemed
necessary, in the reasonable judgment of a party, to comply with applicable laws
or regulations, no announcement, news release, public statement,  publication or
presentation  relating to the existence of this Agreement,  or the terms hereof,
will be made without the other party's prior written  approval,  which  approval
shall  not be  unreasonably  withheld.  The  parties  agree  that  they will use
reasonable  efforts to  coordinate  the initial  announcement  or press  release
relating to the existence of this Agreement so that such initial announcement or
press release by each is made contemporaneously.

                                      23.

<PAGE>


         IN  WITNESS  WHEREOF,  the  parties  hereto  have  duly  executed  this
Agreement.

SUGEN, INC.                                  TAIHO PHARMACEUTICAL CO., LTD.


By:/s/ Stephen Evans-Freke                   By: /s/ Dr. Yukio Kobayashi
   -------------------------------               -------------------------------
Name:Stephen Evans-Freke                     Name: Dr. Yukio Kobayashi
     -----------------------------                 -----------------------------

Title: Chairman of the Board                 Title: President
       ---------------------------                  ----------------------------


SUGEN INTERNATIONAL, AG


By: /s/ Stephen Evans-Freke                          
   -------------------------------

Name: Stephen Evans-Freke         
     -----------------------------

Title: President of the Board     
       ---------------------------

                                      24.

<PAGE>


                                    EXHIBIT A

                          DEVELOPMENT RESPONSIBILITIES

                                   [...***...]


o        SUGEN is responsible for [...***...].



In addition to development  responsibilities  listed above,  as of the Effective
Date, SUGEN is conducting the following pre-clinical studies:

SU6668:
- ---------
1.       [...***...];

2.       [...***...];

3.       [...***...];

4.       [...***...];

5.       Safety Pharmacology:

         [...***...];
         [...***...];
         [...***...];

6.       [...***...];

7.       [...***...];

8.       [...***...];

9.       [...***...];

10.      [...***...].

SU5416:
- ---------
1.       [...***...].


- -----------------------
*    Confidential Treatment Requested

                                       1.

<PAGE>


                                    EXHIBIT B
                                  SUGEN Patents

                                   [...***...]



- -----------------------
*    Confidential Treatment Requested

                                       2.

<PAGE>


                                    EXHIBIT C

                              Clinical Trial Costs


         Clinical  Trial  Costs shall mean  [...***...]  incurred or expended by
SUGEN  or  its  Affiliates  for  a  Product  including  without  limitation  the
following:

         1. [...***...] including without limitation [...***...]

                  (1) [...***...];

                  (2) [...***...]; and

                  (3) [...***...].

         2. [...***...] to SUGEN of conducting  clinical  trials,  including but
not limited to the [...***...].

         3. [...***...] shall include an allocation for [...***...].


- -----------------------
*    Confidential Treatment Requested

                                       i.


<TABLE> <S> <C>


<ARTICLE>                     5
<LEGEND>
     THE SCHEDULE  CONTAINS  SUMMARY  FINANCIAL  INFORMATION  EXTRACTED FROM THE
     COMPANY'S  FROM 10-Q FOR THE NINE MONTHS ENDED  SEPTEMBER  30,  1998 AND IS
     QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER>                                   1,000
       
<S>                             <C>
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                              DEC-31-1998
<PERIOD-START>                                 JAN-01-1998
<PERIOD-END>                                   SEP-30-1998
<CASH>                                          15,390
<SECURITIES>                                    38,912
<RECEIVABLES>                                        0
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                                55,476
<PP&E>                                          14,918
<DEPRECIATION>                                   9,318
<TOTAL-ASSETS>                                  63,680
<CURRENT-LIABILITIES>                           19,658
<BONDS>                                              0
                                0
                                          0
<COMMON>                                       154,494
<OTHER-SE>                                     122,582
<TOTAL-LIABILITY-AND-EQUITY>                    63,680
<SALES>                                              0
<TOTAL-REVENUES>                                 5,164
<CGS>                                                0
<TOTAL-COSTS>                                        0
<OTHER-EXPENSES>                                12,682
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 337
<INCOME-PRETAX>                                 (9,965)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                             (9,965)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    (9,965)
<EPS-PRIMARY>                                    (0.62)
<EPS-DILUTED>                                    (0.62)
        


</TABLE>


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