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Collaborative Research and License Agreement - Novartis Pharma AG and Celgene Corp.

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                  COLLABORATIVE RESEARCH AND LICENSE AGREEMENT

                                 EXECUTION COPY

         THIS  COLLABORATIVE  RESEARCH AND LICENSE AGREEMENT (the  "AGREEMENT"),
effective the 20 day of December, 2000 (the "EFFECTIVE DATE"), is by and between
NOVARTIS  PHARMA  AG, a  corporation  organized  under  the laws of  SWITZERLAND
("NOVARTIS"), having its principal place of business at Lichtstrasse 35, CH-4000
Basel, Switzerland, and CELGENE CORPORATION, a Delaware corporation ("CELGENE"),
having its principal place of business at 7 Powder Horn Drive, Warren, NJ 07059,
U.S.A. (each, a "PARTY" and, collectively, the "PARTIES").

                                    RECITALS

         WHEREAS,  Celgene  and its  Affiliates  (as  defined  below)  developed
expertise and acquired proprietary rights related to selective estrogen receptor
modulator   compounds  ("SERMS")  which  are  selective  for  Estrogen  Receptor
("ER")(alpha) ("ER(alpha)") in U2OS cells (the "ER(alpha)SELECTIVITY" as defined
in Section 1.16);

         WHEREAS,   Novartis  and  its  affiliates   engaged  in  the  research,
development, marketing, manufacture and distribution of pharmaceutical compounds
useful in treating or preventing human diseases and conditions; and

         WHEREAS,  the Parties  desire to engage in a joint  research  effort to
identify or  discover,  on the basis of  Celgene's  lead and library  compounds,
SERMs which are Er(alpha)Selective in U2OS cells (including, without limitation,
compounds in the SP500263 Series (as defined below),  as well as analogs thereof
made by Celgene  prior to the  Effective  Date as part of its internal  research
program  in the  Oncology  Fild (as  defined  below) to  develop  pharmaceutical
products from such  compounds  for the  treatment,  prevention  and diagnosis of
osteoporosis and for other indications as described herein.

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

1.       DEFINITIONS

         For the purposes of this Agreement,  the following terms,  whether used
in their singular or plural form,  shall have the respective  meanings set forth
below:

         1.1 "Active  Compound"  shall mean a Research  Compound  which has been
identified  or confirmed as meeting  those  criteria for  Er(alpha)  potency and
selectivity set forth in Exhibit A hereto in the Primary Field. Active Compounds
shall include,  without  limitation,  Celgene's  proprietary  compounds known as
SP500263,  SPC0001422 (formerly SP500290)and SPC0001426.  Active Compounds shall
specifically exclude Celgene's proprietary compound known as SPC0008490.

         1.2      "Additional  Field" shall mean the  treatment,  prevention and
diagnosis of a disease or disorder,  other than a disease or disorder within the
Primary Field or the Oncology Field.

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         1.3      "Affiliate"  shall  mean,  with  respect  to a  Party  to this
Agreement,  any other  entity,  whether de jure or de facto,  which  directly or
indirectly  controls,  is controlled by, or is under common  control with,  such
Party.  A business  entity or Party  shall be  regarded as in control of another
business entity if it owns, or directly or indirectly  controls,  at least fifty
percent  (50%) (or such lesser  percentage  which is the  maximum  allowed to be
owned by a foreign entity in a particular  jurisdiction)  of the voting stock or
other  ownership  interest of the other entity,  or if it directly or indirectly
possesses  the  power to direct or cause the  direction  of the  management  and
policies of the other entity by any lawful means whatsoever.

         1.4      "Back-Up   Compound"  shall  mean  an  Active  Compound  which
Novartis  designates as a possible  replacement for a Final Selected Compound in
the event Novartis  abandons its development  and/or  commercialization  efforts
with respect to such Final Selected Compound.

         1.5      "Candidate  Compound"  shall mean an Active Compound which (a)
following the provisions set forth in Sections 4 and 5 hereof, has been selected
as a potential FSC Compound or a Back-Up Compound candidate but has not yet been
designated an FSC Compound or a Back-Up  Compound by Novartis,  and (b) has been
tested  in a  pharmacokinetic  study  or  other  primary  in vivo  study  (e.g.,
determination of plasma cholesterol).

         1.6      "Celgene  Approach"  shall mean primary  screening in any U2OS
cells to identify  compounds  that inhibit the IL-6 promoter in an  ER-dependent
fashion.

         1.7      "Celgene  Invention"  shall  have  the  meaning  set  forth in
Section 9.1.

         1.8 "Celgene  Patent  Rights"  shall mean all United States and foreign
patents (including, without limitation, all reissues, extensions, substitutions,
confirmations,  re-registrations,  re-examinations, revalidations and patents of
addition)  and  patent  applications   (including,   without   limitation,   all
continuations, continuations-in-part and divisions thereof) which are Controlled
by Celgene on the Effective Date or during the Research Term, or which cover any
Celgene  Inventions.  Celgene Patent Rights shall exclude,  without  limitation,
Patent Rights covering the CV Assay or the use thereof.

         1.9      "Celgene Products" shall have the meaning set forth in Section
5.4(a).

         1.10     "Collaboration"  shall  mean  the  Research  Program  and each
Party's  activities  with respect to compounds in the Primary Pool, the Oncology
Pool and the Remaining Pool.

         1.11     "Confidential  Information"  shall  the  meaning  set forth in
Section 10.1.

         1.12     "Control"  shall mean  possession  of the ability,  whether by
ownership or license,  to grant a license or  sublicense  as provided for herein
without  violating  the terms of any  agreement or other  arrangements  with any
Third Party.

         1.13     "CV Assay" shall mean Celgene's proprietary novel gene profile
assay for identifying cardiovascular-specific SERMs.

         1.14     "CV Field" shall mean the  treatment,  prevention or diagnosis
of diseases and disorders of the cardiovascular system.

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         1.15  "Er(alpha)-Selectivity"  or "Er(alpha)-Selective"  shall mean the
selectivity  in Celgene's IL-6 release assay in U2OS Cells of greater than fifty
(50)-fold for ER(alpha) versus ER(beta).

         1.16     "FDA"   shall   mean   the   United   States   Food  and  Drug
Administration.

         1.17  "Field of  Cooperation"  shall  mean  research  with  respect  to
Research  Compounds for the  discovery,  development  and/or  identification  of
Active Compounds in the Primary Field.

         1.18     "Field of Use" shall mean, as applicable:

                  (a)      the Primary Field; and/or

                  (b)      any Additional Field; and/or

                  (c)      the Oncology Field.

         1.19     "Final Selected Compound" shall mean an Active Compound which,
following  Novartis' standard compound  development  procedures,  is declared an
"FSC Compound" or granted  equivalent  status by Novartis'  Research  Management
Board or some other similar body, which declaration authorizes the initiation of
preclinical   development   programs   aimed,   inter  alia,   at  the  detailed
investigation  of  those  toxicological,  bioavailability,  pharmacokinetic  and
formulation parameters whose successful completion will allow progression of the
Active Compound to Phase I Clinical Trials.

         1.20 "First Commercial Sale" shall mean, with respect to a Product, the
first sale, for payment in cash or in kind (but excluding  sales or transfers of
a Product  that is used in a  clinical  trial) to a Third  Party in a country or
jurisdiction after Regulatory  Approval has been granted by the governing health
authority of such country or jurisdiction.

         1.21     "FTE" shall mean the  equivalent  of a  full-time  twelve (12)
months'  (including normal vacations,  sick days and holidays) work of a person,
carried out by one or more employees of Celgene, who devotes a portion of his or
her time to the Research Program;  provided,  however, that Novartis understands
and agrees that Celgene retains complete discretion to change the identity,  the
frequency  and the time which any  individual  employee  devotes to the Research
Program so long as such changes shall not have a negative impact on the progress
of the Research Program.

         1.22     "IND" shall mean an investigational new drug application filed
with the FDA (pursuant to 21 CFR ss.312.3)  necessary to commence human clinical
trials of a pharmaceutical product, or the equivalent application filed with any
equivalent agency or governmental authority outside the United States (including
any  supra-national  agency such as in the European Union) necessary to commence
human clinical trials of a pharmaceutical product.

         1.23     "Independent  Research"  shall have the  meaning  set forth in
Section 4.2(a).

         1.24     "Invention" shall have  the meaning set forth in  Section 9.1.

         1.25     "Information"  shall  mean all  tangible  and  intangible  (i)
techniques,  technology,  practices,  trade secrets,  inventions (whether or not
patentable),  methods,  knowledge,  know-how,  skill, experience,  test data and
results  (including  pharmacological,

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toxicological  and  clinical  test data and  results),  analytical  and  quality
control  data,   results  or  descriptions  and  software  and  (ii)  compounds,
compositions of matter,  cells, cell lines, assays, and physical,  biological or
chemical material.

         1.26     "Joint  Invention" shall have the meaning set forth in Section
9.1.

         1.27     Joint Patent  Rights" shall mean all United States and foreign
patents (including, without limitation, all reissues, extensions, substitutions,
confirmations,  re-registrations,  re-examinations, revalidations and patents of
addition)  and  patent  applications   (including,   without   limitation,   all
continuations,  continuations-in-part  and divisions  thereof)  claiming a Joint
Invention.

         1.28     "Know-How" shall mean all Information Controlled by a Party on
the  Effective  Date or during the Research Term that is necessary or useful for
the discovery,  identification,  synthesis,  development,  manufacture or use of
Active Compounds  and/or Products or, in the case of Know-How of Celgene,  after
the  Research  Term insofar and to the extent that it is necessary or useful for
the  development  or  manufacture  by Novartis  of Products  pursuant to Section
6.2(a) hereof.

         1.29     "Major  Market"  shall  mean the  United  States,  the  United
Kingdom, Germany, France, Italy, Spain, Switzerland, or Japan.

         1.30     "Materials" shall  have the meaning set forth  in Section 3.7.

         1.31     "NDA" shall mean a new Drug Application and all amendments and
supplements thereto filed with the FDA (as more fully defined in 21 C.F.R. 314.5
et seq.),  or the equivalent  application  filed with any  equivalent  agency or
governmental  authority outside the United States (including any  supra-national
agency such as in the  European  Union)  requiring  such filing,  including  all
documents, data, and other information concerning a pharmaceutical product which
are  necessary  for  gaining  Regulatory   Approval  to  market  and  sell  such
pharmaceutical product.

         1.32 "Net Sales" shall mean,  with  respect to any Product,  the amount
billed by Novartis or its Affiliate or sublicensee to a Third Party which is not
an  Affiliate r  sublicensee  of the selling  party  (unless  such  Affiliate or
sublicensee  is the end user of such  product,  in which case the amount  billed
therefore shall be deemed to be the amount that would be billed to a Third Party
in an arm's-length  transaction)  for sales of such Product,  less the following
items, as allocable to such Product: (i) trade discounts, credits or allowances,
(ii) credits or  allowances  additionally  granted upon  returns,  rejections or
recalls (except where any such recall arises out of Novartis' or its Affiliate's
or sublicensee's gross negligence,  willful misconduct or fraud), (iii) freight,
shipping and insurance charges, (iv) taxes, duties or other governmental tariffs
(other than income taxes) and (v) government  mandated  rebates,  if any; all in
accordance  with Novartis'  standard  accounting  methods,  which methods are in
accordance with generally accepted accounting principles.

         In the event that the Product is sold as a multi-component  product and
is not separately invoiced, then Net Sales shall be based on that portion of the
total amount billed for the multi-component  product which is fairly allocatable
to the Product in comparison  with the other  components.  Such portion shall be
set in good faith negotiations between the Parties at such time as the filing of
applications for Regulatory Approval for the  multi-component  product are being
seriously considered by Novartis and will take into account all relevant

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factors including relative cost and therapeutic and diagnostic  contributions of
the components and the relative  contributions of the Parties to the development
of the components.

         1.33     "Novartis  Invention"  shall  have the  meaning  set  forth in
Section 9.1.

         1.34     "Novartis  Patent  Rights"  shall mean all  United  States and
foreign  patents  (including,  without  limitation,  all  reissues,  extensions,
substitutions, confirmations,  re-registrations,  re-examinations, revalidations
and patents of addition) and patent applications (including, without limitation,
all  continuations,  continuations-in-part  and  divisions  thereof)  which  are
Controlled  by Novartis on the  Effective  Date or during the Research  Term, or
which cover any Novartis Inventions.

         1.35     "Novartis  Review  Period" shall have the meaning set forth in
Section 4.2(b).

         1.36     "Oncology  Data"  shall have the  meaning set forth in section
4.2(a).

         1.37     "Oncology  Field"  shall mean the  treatment,  prevention  and
diagnosis of cancers and, unless Novartis  provides  Celgene with written notice
during the ninety (90) day period  following the Effective  Date that is in good
faith intends to pursue research and/or development in such area, the treatment,
prevention and diagnosis of ocular diseases and disorders.

         1.38     "OVX  Study"  shall  have the  meaning  set  forth in  Section
4.2(c).

         1.39     "Patent  Rights" shall mean Celgene  Patent  Rights,  Novartis
Patent Rights or Joint Patent Rights, as applicable.

         1.40 "Phase I Clinical  Trials" shall mean that portion of the clinical
development  program which generally  provides for the first  introduction  into
humans  of  a  pharmaceutical   properties  and  clinical  pharmacology  of  the
pharmaceutical product A

         1.41     "Phase II  Clinical  Trials"  shall  mean that  portion of the
clinical  development  program  which  provides  for  the  initial  trials  of a
pharmaceutical  product on a limited number of patients for the primary  purpose
of evaluating safety, dose ranging and efficacy in the proposed indication.

         1.42     "Phase III  Clinical  Trials"  shall mean that  portion of the
clinical  development  program  which  provides  for the  continued  trials of a
pharmaceutical product on sufficient numbers of patients to establish the safety
and efficacy of a pharmaceutical product for the desired claims and indications.

         1.43     "Pool" shall mean the Primary  Pool,  the Oncology Pool or the
Remaining Pool, as applicable, each as defined below:

                  (a)      "Primary  Pool"  shall have the  meaning set forth in
Section 4.1(b);

                  (b)      "Oncology  Pool"  shall  mean  the  pool of  Research
Compounds  and  Active  Compounds  not  selected  by  Novartis  for the  further
profiling, development and commercialization in the Primary Field, as more fully
described in Sections 4.1 and 5.1.



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                  (c)      "Remaining  Pool"  shall  mean the  pool of  Research
Compounds and Active  Compounds not selected by Novartis for further  profiling,
development and  commercialization in the Primary Field, as more fully described
in Sections  4.1 and 5.1,  and not  selected  by Celgene for further  profiling,
development and commercialization in the Oncology Field, as more fully described
in Section 5.2(a).

         1.44     "Primary  Field"  shall  mean the  treatment,  prevention  and
diagnosis of osteoporosis.

         1.45     "Product"  shall mean a product,  whether  in  development  or
commercialized, containing any formulation or dosage of (a) a Candidate Compound
or a Final  Selected  Compound or a Back-Up  Compound  substituted  for any such
final  Selected  Compound  or (b) a compound  (i) which is a  derivative  of any
Research  Compound  discovered  by Novartis  after the  Research  Term,  or (ii)
identified,  discovered or developed at any time using Confidential  Information
of Celgene, in each of the cases described in Section 3.8 hereof; and shall mean
a Primary Product or an Additional Product, each as defined below:

                  (a)      "Primary  Product"  shall  mean  a  product  selected
pursuant  to the  provisions  of  Sections  4.1 and 5.1 hereof  for  development
primarily in the Primary Field and secondarily in Additional Fields.

                  (b)  "Additional  Product"  shall mean (a) a Product  selected
pursuant to the provisions of Section 5.3 hereof for  development in one or more
Additional  Fields and (b) a Product that was  initially  developed as a Primary
Product but whose  development in the Primary  Field,  but not in the Additional
Field(s)  for  which  it is also  being  developed,  had to be  discontinued  by
Novartis for scientific or commercial or strategic reasons.

         A  Primary  Product  and an  Additional  Product  may  also  be used in
combination  with  any  other  pharmaceutical  product  or as a  component  of a
multi-component product.

         1.46     "Project  Contact Persons" shall have the meaning set forth in
Section 2.6.

         1.47     "Regulatory Approval" shall mean any approval (including price
and reimbursement approvals),  licenses,  registrations or authorizations of any
supra-national, federal, state or local regulatory agency, department, bureau or
other government entity,  necessary for the manufacture,  use, storage,  import,
transport or sale of a pharmaceutical product in a regulatory jurisdiction.

         1.48   "Research   Compound"   shall   mean  (a)  any   SERM   that  is
Er(alpha)Selective  that is Controlled  by Celgene as of the  Effective  Date or
during the  Research  Term and (b) any  derivative  or isomer  thereof  which is
Controlled by a Party  whether  during or after the Research  Term,  and (c) any
other compound discovered,  identified or developed by a Party in the course and
as a result of the  Research  Program.  Research  Compounds  shall  specifically
exclude Celgene's proprietary compound known as SPC0008490.

         1.49     "Research  Management  Committee"  or  "RMC"  shall  mean  the
research  management  committee  composed  of  representatives  of  Celgene  and
Novartis described more fully in Section 2.1 hereof.


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         1.50     "Research  Plan" shall mean the  detailed  description  of the
research  activities to be performed by the Parties in the Field of  Cooperation
set forth in Exhibit B hereto,  as revised from time to time by the RMC pursuant
to Section 2.5.

         1.51     "Research  Program"  shall mean the program of research in the
Field of Cooperation in which Celgene and Novartis will  participate  under this
Agreement  during the  Research  Term and which is  described  generally  in the
Research Plan.

         1.52     "Research  Term"  shall  mean the period of two (2) years from
the Effective Date, unless terminated earlier pursuant to Article 12, subject to
extension in accordance with Section 3.3.

         1.53     "Royalty  Term"  shall have the  meaning  set forth in section
7.3.

         1.54  "SP500263  Series"  shall mean  Celgene's  proprietary  compounds
claimed in U.S. Patent Application  Serial No.  09/475,776,  filed December 1999
(or any  continuation,  continuation-in-part  or division  thereof),  including,
without  limitation,  SP500263,  SPC0001422 and SPC0001426.  The SP500263 Series
shall specifically exclude Celgene's proprietary compound known as SPC0008490.

         1.55     "Territory" shall mean the entire world.

         1.56     "Third  Party"  shall mean a party  other than a Party and its
Affiliates.

         1.57     "U2OS Cells" shall mean (a)  Celgene's  patent U2OS cell line,
(b)  Celgene's  ER(alpha)-transfected  U2OS cell line  (clone #:  B-11),  or (c)
Celgene's ER(beta)-transfected U2OS cell line (clone#: 10).

         1.58     "Valid  Claim"  shall mean either (a) a claim of an issued and
unexpired  patent  included within the Celgene Patent Rights or the Joint Patent
Rights, which has not been held permanently revoked, unenforceable or invalid by
a decision of a court or other  governmental  agency of competent  jurisdiction,
unappealed  within the time allowed for appeal,  and which has not been admitted
to be invalid or unenforceable through reissue or disclaimer or otherwise or (b)
a claim of a pending  patent  application  included  within the  Celgene  Patent
Rights or the Joint Patent  Rights,  which claim was filed in good faith and has
not been abandoned or finally  disallowed  without the  possibility of appeal or
refiling of said application.

2.       RESEARCH PROGRAM GOVERNANCE.

         2.1      RESEARCH   MANAGEMENT   COMMITTEE.    The   Research   Program
established by this Agreement shall be overseen by a committee composed of three
(3)  representatives  of Novartis and three (3)  representatives of Celgene (the
"RESEARCH  MANAGEMENT  COMMITTEE" or "RMC").  The Parties shall  designate their
representatives  on the RMC within ten  business  (10) days after the  Effective
Date.  A Party may change one or more of its  representatives  to the RMC at any
time. An alternate  member  designated by a Party may serve  temporarily  in the
absence  of a  permanent  member of the RMC for such  Party.  Each  Party  shall
designate one of its  representatives as a Co-Chair of the RMC. Each Co-Chair of
the RMC will be responsible  for the agenda and the minutes of  alternating  RMC
meetings.

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         2.2      MEETINGS OF THE RMC. The RMC shall hold meetings at such times
and places as shall be determined by the RMC, and may conduct meetings in person
or by video  conference or telephone  conference.  Face-to-face  meetings  shall
alternate between the research offices of each Party, and shall be held not less
frequently  than once every three (3) months  during the Research  Term.  Either
party may permit additional  employees and consultants to attend and participate
(on a  non-voting  basis) in the RMC  meetings,  subject to the  confidentiality
provisions of Article 10.

         2.3      MINUTES.  Promptly after each meeting  (whether held in person
or by  telecommunication),  the  responsible  Co-Chair  shall  prepare  or  have
prepared the minutes  reporting in  reasonable  detail the actions  taken by the
RMC,  the  status of the  Research  Program,  issues  requiring  resolution  and
resolutions  of previously  reported  issues,  which minutes are to be signed by
each Co-Chair of the RMC.

         2.4      RMC  ACTIONS.  Actions by the RMC  pursuant to this  Agreement
shall be taken, in person or by proxy, only with unanimous consent of all of the
representatives  of the RMC. Any  disagreement  among members of the RMC will be
resolved within the RMC based on the efficient  achievement of the objectives of
this  Agreement.  In the event that the RMC  cannot  reach  agreement  as to any
matter that is subject to its  decision-making  authority,  the matter  shall be
referred  to the  Chief  Executive  Officer  of  Celgene  and the Head of Global
Research of Novartis for resolution.

         2.5      RMC FUNCTIONS AND POWERS. The RMC shall be responsible for the
overall  supervision and management of the Research  Program and the regular and
prompt  determination  of whether an Active Compound shall be, or continue to be
(as applicable),  included in the Primarily Pool. The principal functions of the
RMC will be to foster the collaborative  relationship  between the Parties,  and
the RMC shall in particular:

                  (a)      develop and approve the  Research  Plan for each year
of the Research Term determining in detail the activities to be performed by the
Parties under the Research Program;

                  (b)      periodically  review the  Research  Plan and  approve
amendments thereto as necessary;

                  (c)      facilitate  and  monitor  the   technology   transfer
between the Parties;

                  (d)      monitor the progress of the Research Program;

                  (e)      create and maintain records of (i) Research Compounds
studied and Active Compounds  identified in the course of the Research  Program,
(ii)  Candidate  Compounds,  Final  Selected  Compounds  and  Back-Up  Compounds
selected by Novartis  from the Primary  Pool or the  Remaining  Pool for further
research and development, (iii) Research Compounds and Active Compounds selected
by Celgene from the Oncology Pool or the Remaining Pool for further research and
development,  (iv) the  Field(s)  of Use  being  pursued  by  Novartis  for each
Candidate  Compound,  Final Selected  Compound and Back-Up  Compound and (v) any
Additional  Field(s)  with respect to which  Celgene has  obtained  rights under
Section 5.4;

                  (f)      encourage  and  facilitate  ongoing  cooperation  and
information exchange between the Parties; and



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                  (g)      review patent issues related to Inventions.

         2.6      PROJECT CONTACT  PERSONS.  Each Party shall appoint a "PROJECT
CONTACT  PERSON" to perform the day-to-day  interactions  with the other Party's
Project  Contact  Person and to manage the  day-to-day  conduct of the  Research
Program.

         2.7      OBLIGATIONS OF PARTIES. Novartis and Celgene shall provide the
RMC and its authorized  representatives  with  reasonable  access during regular
business hours to all records and documents of the respective  Parties  specific
to the Research Program that the RMC may reasonably  require in order to perform
its   obligations   hereunder,   subject  to  any  bona  fide   obligations   of
confidentiality to a Third Party.

3.       CONDUCT OF THE RESEARCH PROGRAM

         3.1      OBJECTIVES.  Subject  to the  terms  and  conditions  of  this
Agreement,  Celgene and Novartis shall conduct collaborative research activities
in the Field of Cooperation in accordance  with the Research Plan with the goals
of (a)  developing  and  commercializing  one or more  Active  Compounds  in the
SPS00263 Series, and (b) identifying,  through a chemical derivatisation program
conducted by Celgene with Novartis' participation, one or more Back-Up Compounds
with optimized properties and continuing to profile the effect of such compounds
biologically.

         3.2.     CONDUCT OF THE RESEARCH. Promptly after the Effective Date and
from time to time as necessary during the course of the Research  Program,  each
Party will disclose to the other the Know-How and Patent Rights of such Party as
the other Party  reasonably  needs to conduct its obligations and assigned tasks
assigned in the Research Plan. Each Party shall conduct its activities  assigned
in the Research  Plan in a good  scientific  manner,  and in  compliance  in all
material  respects with the  requirements of applicable laws and regulations and
with applicable good laboratory practices and good manufacturing  practices,  to
attempt to achieve its  objectives  efficiently  and  expeditiously.  Each Party
shall  maintain  laboratories,  offices  and  all  other  facilities  reasonably
necessary to carry out the  activities to be performed by such Party pursuant to
the Research Plan. In conformity with standard  pharmaceutical and biotechnology
industry  practices and the terms and conditions of this  Agreement,  each Party
shall  prepare  and  maintain,  or shall cause to be  prepared  and  maintained,
complete and accurate written records,  accounts,  notes,  reports and data with
respect to activities  conducted  pursuant to the Research Program and, upon the
other Party's written request, shall send legible copies of the aforesaid to the
other  Party.  Upon  reasonable  advance  notice,  each Party agrees to make its
employees and non-employee  consultants reasonably available at their respective
places of  employment to consult with the other Party on issues  arising  during
the Research  Program and in  connection  with any request  from any  regulatory
agency, including,  without limitation,  regulatory,  scientific,  technical and
clinical testing issues.

         3.3.     RESEARCH TERM EXTENSION.  Novartis shall have the option,  but
not the obligation,  in its sole discretion,  to extend the Research Team for an
additional  one (1) year period  subject to its payment of the funding  provided
for in Section 3.4.  Novartis shall  exercise such option,  if at all, by giving
Celgene  written notice not less than ninety (90) days prior to the second (2nd)
anniversary of the Effective Date.

         3.4.     RESEARCH  COMMITMENT  AND  PRIMARY  DATA  ACCESS.  During  the
Research  Term,  the Parties shall  diligently  conduct the Research  Program in
accordance  with the  Research  Plan as  revised  from  time to time by the RMC.
Without limiting the generality of


                                       9
<PAGE>

the  foregoing,  Celgene  shall  devote to the Research  Program  eight (8) FTEs
during each year of the Research Term; provided,  however,  that Celgene may, in
its sole  discretion,  devote  such  additional  number of FTEs to the  Research
Program as it deems appropriate;  and provided, further, that if Novartis elects
to extend the Research  Term in  accordance  with Section  3.3,  Novartis  shall
provide,  unless  otherwise  agreed by the Parties in writing,  funding for such
eight (8)  Celgene  FTEs for such third (3rd) year of the  Research  Team at the
rate to be  agreed by the  Parties,  which  rate  shall in no event be less than
$250,000 per FTE. The amounts due to Celgene under the preceding  sentence shall
be payable in advance in equal quarterly  installments  for the third (3rd) year
of the Research Term,  within twenty (20) business days of receipt of an invoice
from Celgene.

         Celgene shall grant Novartis access to all primary data generated by or
on behalf of Celgene in the course of the Research Program.  Novartis shall have
the  right,  at  reasonable  intervals  (but not more  frequently  than once per
quarter), at Novartis' own expense and subject to the confidentiality provisions
of this  Agreement,  to make copies of Celgene's  primary data for archiving and
regulatory purposes.

         3.5      RESEARCH  REPORTS.  Each Party each shall keep the other Party
fully  informed as to all  discoveries  and technical  developments  (including,
without  limitation,  any  Inventions)  made  under  the  Research  Program.  In
particular,  Celgene and Novartis  each shall  prepare,  and  distribute  to all
members of the RMC, no later than ten (10)  business  days prior to the next RMC
meeting,  a reasonably  detailed written summary report, in such form and format
and setting forth such information  regarding the Research Program as determined
from time to time by the RMC.  Nothing  herein  shall  require  either  Party to
disclose  information  received from a Third Party which remains subject to bona
fide confidentiality obligations to such Third Party.

         3.6      SUBCONTRACTS.  Novartis  and Celgene may perform some of their
obligations under the Research Plan through one or more subcontractors, provided
that  (i) none of the  rights  of  either  Party  hereunder  are  diminished  or
otherwise  adversely affected as a result of such  subcontracting,  and (ii) the
subcontractor  undertakes in writing  obligations of confidentiality and non-use
regarding  Confidential  Information  which are  substantially the same as those
undertaken  by the Parties  pursuant to Article 10 hereof.  In the event  either
Party performs one or more of its obligations  under the Research Plan through a
subcontractor,  then  such  Party  will  at all  times  be  responsible  for the
performance and payment of such subcontractor.

         3.7      MATERIALS  TRANSFER.  In  order  to  facilitate  the  Research
Program,  either  Party  may  provide  to the  other  Party  certain  biological
materials  or  chemical  compounds  including,  but  not  limited  to,  Research
Compounds,   receptors,   reagents  and  screens   (collectively,   "MATERIALS")
Controlled by the supplying  Party (other than under this  Agreement) for use by
the other Party in  furtherance  of the  Research  Program.  Except as otherwise
provided under this Agreement,  all such Materials  delivered to the other Party
will  remain the sole  property  of the  supplying  Party,  will be used only in
furtherance  of the  Research  Program and solely under the control of the other
Party,  will not be used or  delivered  to or for the benefit of any Third Party
without the prior written consent of the supplying  Party,  and will not be used
in research or testing involving human subject unless  specifically agreed to by
the supplying  Party in writing.  The Materials  supplied under this Section 3.7
must be used with prudence and  appropriate  caution in any  experimental  work,
because  not all of  their  characteristics  may be  known.  THE  MATERIALS  ARE
PROVIDED "AS IS" AND WITHOUT ANY REPRESENTATION OR WARRANTY, EXPRESS OR IMPLIED,
INCLUDING

                                       10


<PAGE>

WITHOUT LIMITATION ANY IMPLIED WARRANTY OF MERCHANTABILITY OR OF FITNESS FOR ANY
PARTICULAR  PURPOSE  OR ANY  WARRANTY  THAT  THE USE OF THE  MATERIALS  WILL NOT
INFRINGE OR VIOLATE ANY PATENT OR OTHER PROPRIETARY RIGHTS OF ANY THIRD PARTY.

     3.8  RESTRICTED ACTIVITIES.

          (A) Each Party  shall be free to  conduct  research,  development  and
commercialization   in  any  field  with   respect  to   compounds   other  than
ER(alpha)-Selective SERMs.

          (B) Celgene Provisions during Research Term: During the Research Term,
Celgene shall collaborate exclusively with Novartis to identify  ER(alpha)-SERMs
in the Primary Field.

          (C) Novaris Provisions during Research Term: During the Research Term,
neither  Novartis  nor any of its  Affiliates  shall  (i)  identify  or  conduct
research with respect to any ER(alpha)-Selective SERM in the Primary Field using
the Celgene  Approach except as part of the Research  Program or (ii) develop or
commercialize any  ER(alpha)-Selective  SERM in the Primary Field except as part
of the  Research  Program.  Novartis is free,  however,  to identify and develop
ER(alpha)-Selective  SERMs  covered by the terms of this  Agreement in any other
indication (including oncology); provided that Novartis does not use the Celgene
Approach,  provided further that to the extent such compounds are derivatives of
the  SP500263  Series or  derivatives  of  Research  Compounds,  or  discovered,
identified or developed  using any  Confidential  Information  of Celgene,  such
compounds  shall be subject to the  provisions  of Sections 7.2, 7.3 and 7.4 and
Article 8 hereof.

          During the Research Term,  Novartis shall not be allowed to enter into
research    alliances    with   any   Third   Parties   aimed   at   identifying
ER(alpha)-Selective SERMs in the Primary Field using the Celgene Approach.

          (D) Novartis Provisions after Research Term:  Following  expiration of
the Research Term and subject to Section  3.8(e) below,  Novartis shall have the
right to conduct,  internally or in collaboration with Third Parties,  research,
development   or   commercialization    with   respect   to   SERMs   that   are
ER(alpha)-Selective,   provided  that  (a)  Novartis   and/or  its  Third  Party
collaborators,  as applicable,  do not use the Celgene Approach,  and (b) to the
extent such compounds are  derivatives of the SP500263  Series or derivatives of
Research  Compounds,  or discovered,  identified or developed using Confidential
Information  of Celgene,  such  compounds  shall be subject to the provisions of
Sections 7.2, 7.3 and 7.4 and Article 8 hereof. If, following the Research Term,
Novartis pursues,  internally or in collaboration  with Third Parties,  any such
research,    development    or    commercialization    of    SERMS    that   are
ER(alpha)-Selective,  then  Novartis  shall keep  Celgene  informed on important
pre-clinical and clinical  milestones for  ER(alpha)-Selective  SERM development
compounds not covered by this Agreement,  both internally  developed by Novartis
or licensed in by Novartis (such as initiation of toxicology and safety studies,
IND filing, commencement of Phase I, Phase II and Phase III Clinical Trials, NDA
filing and Regulatory  Approval),  in order to permit Celgene to ascertain:  (x)
Novartis' diligence in pursuing  development and  commercialization  of Products
hereunder relative to such other compounds; and (y) whether any payments are due
to Celgene  under  Sections  7.2,  7.3 and/or  7.4 hereof  with  respect to such
compounds.

                                       11

<PAGE>
          (E) Development  Compounds  Licensed-In by Novartis: In the event that
Novartis,  during the term of this  Agreement,  licenses  from a Third Party any
ER(alpha)-Selective SERM that is at the same or at a more advanced developmental
stage in an indication  for which also a Product is being  developed by Novartis
(unless such licensed compound is at a development stage so significantly  ahead
of such Product that it can be reasonably  assumed in both Parties' opinion that
it will not negatively  affect the  commercial  potential of a Product) then all
rights to such  Product  with  respect to such  indication  shall revert back to
Celgene.

4.   ACTIVE COMPOUNDS

     4.1  IDENTIFICATION OF ACTIVE COMPOUNDS IN THE PRIMARY FIELD.

          (A)  Celgene,   with  such  participation  of  Novartis  personnel  as
determined by the RMC, shall perform  chemical  derivatisation  activities  with
respect to the  SP500263  Series and other  Research  Compounds  in the Field of
Cooperation in accordance with the Research Plan.  Research  Compounds shall, as
promptly as practicable,  be tested as provided in the Research Plan in order to
identify  compounds  which meet the  criteria for Active  Compounds.  Each Party
shall promptly  disclose the results of such activities to the RMC in accordance
with Section 3.5 hereof.

          (B) Upon the  determination  that a Research  Compound  satisfies  the
criteria for an Active Compound,  then such Active Compound shall become part of
a  pool  of   Active   Compounds   for   potential   further   development   and
commercialization  by Novartis in the Primary Field in accordance with the terms
of this Agreement (the "PRIMARY POOL").

               (i) Any Research  Compound  which is determined by the RMC (which
determination  shall be noted in the minutes of the  applicable RMC meeting) not
to meet the  criteria  for  Active  Compounds  shall,  upon such  determination,
automatically  be excluded  from the Primary  Pool and  included in the Oncology
Pool, subject to Section 5.2(a) and 5.2(b).

               (ii) On a regular and prompt basis during the Research  Term, the
RMC shall  determine in good faith which of the Active  Compounds in the Primary
Pool are no longer viable  candidates  for further  profiling,  development  and
commercialization  for use in the Primary  Field (which  determination  shall be
noted  in  the  minutes  of  the  applicable   RMC  meeting),   and,  upon  such
determination,  such Active  Compounds shall  automatically be excluded from the
Primary  Pool and  included in the  Oncology  Pool,  subject to Section  5.2(a);
provided,  however,  that Novartis  shall have the continued  right to study all
Oncology  Pool  compounds  for their  potential in the Primary  Field and in any
Additional Field (it being understood that Novartis may only obtain a license to
develop or  commercialize  any such compound after such compound becomes part of
the Remaining Pool).

     4.2  CELGENE ACTIVITIES.

          (A) Celgene shall have the right,  in its  discretion  and at its sole
expense,  to perform  chemical  derivatisation  activities  outside the Research
Program  with  respect  to  compounds  in the  SP500263  Series in  addition  to
Celgene's  proprietary compounds known as SP500263,  SPC0001422,  and SPC0001426
and other Research Compounds  (including,  without limitation,  Active Compounds
within the Primary Pool) in the Oncology Field (the

                                       12
<PAGE>

"INDEPENDENT RESEARCH"). Novartis hereby acknowledges that Celgene has, prior to
the Effective Date, made analogs of the compounds in the SP500263 Series as part
of Celgene's internal research program and that such analogs shall be subject to
the provisions of this Section 4.2. Celgene shall promptly  disclose to Novartis
any Active  Compounds  identified or discovered by Celgene in the course of such
activities.  Without  limiting the  generality of the  foregoing,  Celgene shall
disclose to Novartis in writing, with respect to each Active Compound identified
or discovered by Celgene in the course of the Independent  Research  information
regarding  the potency of such Active  Compound for  inhibition  of II-6 release
from ER(alpha) or  ER(beta)-transferred  U2OS cells, and the chemical  structure
and MCF7 cell and, optionally,  other  selected  tumor cell line profile of such
Active Compound  (collectively,  the "ONCOLOGY DATA"). Upon Celgene's disclosure
to Novartis  of, the  Oncology  Data with  respect to an Active  Compound,  such
Active Compound shall become part of the Primary Pool, subject to the provisions
of this Section 4.2.

          (B) As soon as  practicable  (and in any event within thirty (30) days
or such longer period as noted in the RMC minutes)  following  Novartis' receipt
of Oncology Data regarding any Active  Compound  pursuant to Section 4.2(a) (the
"NOVARTIS  REVIEW  PERIOD"),  Novartis  shall in good  faith  either  (i) inform
Celgene of its intention to enter such Active  Compound  into a  pharmacokinetic
study or (ii) inform Celgene of its intention to enter such Active Compound into
another  primary in vivo study (e.g.,  determination  of plasma  cholesterol) or
(iii)  notify  Celgene in writing  that  Novartis  declines  to conduct  further
research  and  development  thereon.  Novartis  shall,  within  two  (2)  months
following  any such notice  under  either (i) or (iii) above with respect to any
Active  Compound,  enter such Active  Compound into a  pharmacokinetic  study or
other  primary  in vivo  study,  as  applicable.  Any Active  Compound  of which
Novartis  does not inform  Celgene  during  the  Novartis  Review  Period of its
intention  to enter into  either (i) or (ii) above in the Primary  Field  shall,
upon the earlier of Novartis' notice to Celgene pursuant to the preceding clause
(iii)  or the  expiration  of the  Novartis'  Review  Period,  automatically  be
excluded from the Primary Pool and included in the Oncology Pool, subject to the
provisions of Section 5.2(b).

          (C)  With  respect  to each  Active  Compound  with  respect  to which
Novartis  informs  Celgene during the Novartis Review Period of its intention to
enter into a  pharmakinetic  study or another  primary in vivo study pursuant to
Section 4.2(b),  Novartis shall have twenty (20) business days after  completion
of such  study to notify  Celgene in writing  either (i) that  Novartis  in good
faith  intends to enter such Active  Compound into a 28-day  ovariectomized  rat
model in the Primary Field (each, an "OVX STUDY") or (ii) that Novartis declines
to  conduct  further  research  and  development  thereon.  Upon the  earlier of
Novartis'  notice to Celgene  pursuant to the preceding clause (ii) or Novartis'
failure to provide Celgene with any notice pursuant to the preceding  clause (i)
or (ii) prior to the  expiration  of such twenty (20)  business  day period with
respect to such Active  Compound,  such Active Compound shall  automatically  be
excluded from the Primary Pool and included in the Oncology Pool, subject to the
provisions of Section 5.2(b).

          (D) With respect to each Active Compound that Novartis elects to enter
into  an OVX  Study  pursuant  to  Section  4.2(c),  Novartis  shall  as soon as
practicable  (and in any event with  three (3)  months  after the date of notice
pursuant to Section  4.2(c)(i))  complete  such OVX Study and review the results
thereof.  On or prior to the end of such three (3) month period.  Novartis shall
disclose to the RMC the results of such OVX Study.  The RMC shall then  promptly
and in good faith  determine  whether  such Active  Compound  (x) shall become a
Candidate Compound in the Primary Field or (y) may be pursued by


                                       13

<PAGE>
Celgene  in the  Oncology  Field,  in which  case  such  Active  Compound  shall
automatically  be excluded  from the Primary  Pool and  included in the Oncology
Pool, subject to the provisions of Section 5.2(b).

          (E)  Notwithstanding  the  conditions in Sections  4.2(b)  through (d)
above, in the event that the number of Active Compounds  exceeds the capacity of
the in vivo  resources  assigned by Novaris to meet the timelines  determined in
Section 4.2(b),  4.2(c) and 4.2(d),  Celgene and Novartis shall agree such other
timelines  as both parties feel are  appropriate,  such amended  timelines to be
subsequently confirmed in writing by the Parties.

5.   SELECTION AND DEVELOPMENT OF COMPOUNDS

     5.1  SELECTION  AND  DEVELOPMENT  OF CANDIDATE  COMPOUNDS,  FINAL  SELECTED
COMPOUNDS AND BACK-UP COMPOUNDS BY NOVARTIS IN THE PRIMARY FIELD.

          (A) Novartis shall use its commercially  reasonable efforts to conduct
development on Active  Compounds within the Primary Pool in the Primary Field to
determine  whether  one or more of such  compounds  meet the  criteria  Novartis
applies to compounds to qualify for selection as Candidate  Compounds or Back-Up
Compounds or for  development as Final Selected  Compounds in the Primary Field.
Novartis  shall  keep  Celgene  informed  as to the  progress  of the  profiling
activities of all such Active Compounds.  Without limiting the generality of the
foregoing,  Novartis shall regularly,  promptly and in good faith notify Celgene
in writing of those Active Compounds as to which Novartis is no longer pursuing,
or does not  intend to  pursue,  development  in the  Primary  Field.  Upon such
notification  with respect to an Active  Compound,  such Active  Compound  shall
automatically  be excluded  from the Primary  Pool and  included in the Oncology
Pool, subject to the provisions of Section 5.2(b).

          (B) Novartis shall select from the Primary Pool those Active Compounds
which  Novartis  desires,  and in good  faith  intends,  to select as  Candidate
Compounds for  development  as Final  Selected  Compounds (or Back-Up  Compounds
therefor) in the Primary Field,  and shall give prompt notice to Celgene of each
Compound  which  has been  selected  as a  Candidate  Compound,  Final  Selected
Compound  or  Back-Up  Compound.  Novartis  hereby  agrees  that it shall not be
permitted to file an IND for the Primary Field, or for any other Field of Use as
to which  Novartis has rights  hereunder,  with  respect to any Active  Compound
hereunder without first designating such compound as a Candidate Compound, Final
Selected Compound or Back-Up Compound.  The Candidate Compounds,  Final Selected
Compounds and Back-Up Compounds  identified by Novartis as such from the Primary
Pool shall be noted in the  minutes of the RMC  meeting  immediately  succeeding
such identification.  Novartis shall use its commercially  reasonable efforts to
conduct such  preclinical and human clinical trials of Final Selected  Compounds
as Novartis determines are necessary or desirable to obtain Regulatory Approvals
to manufacture and market Products incorporating such Final Selected Compound in
the  Primary  Field  in the  Territory.  Novartis  shall  use  its  commercially
reasonable  efforts to seek all  necessary  Regulatory  Approvals  required  for
marketing  a Product in the  Primary  Field in the Major  Markets and such other
countries  where  Novartis  markets  its  own  products  of  similar  commercial
potential.

          (C) With respect to any Candidate Compounds or Final Selected Compound
or Product that Novartis is  diligently  developing  or  commercializing  in the
Primary  Field,  Novartis  may also  develop and  commercialize  such  Candidate
Compound or Final Selected Compound or Product in one or more Additional Fields,
subject to Section 5.4.

                                       14
<PAGE>

          (D)  Novartis  shall keep  Celgene  informed as to the progress of the
development of all Candidate Compounds and Final Selected Compounds and Products
in the Primary Field (and any  Additional  Field also being pursued with respect
thereto) by providing to Celgene reasonably detailed written six-monthly reports
which shall describe the progress of the development and regulatory filings with
respect to Candidate  Compounds  or Final  Selected  Compounds  or Products,  as
applicable.

          (E) Any  Active  Compounds  remaining  in the  Primary  Pool as of the
expiration  of the  Research  Term which  have not been  selected  as  Candidate
Compounds or Final  Selected  Compounds or Back-Up  Compounds  shall,  upon such
expiration,  automatically be excluded from the Primary Pool and included in the
Oncology Pool, subject to Section 5.2(a).

     5.2 SELECTION AND  DEVELOPMENT  OF COMPOUNDS BY CELGENE WITHIN THE ONCOLOGY
POOL IN THE ONCOLOGY FIELD.

          (A) Celgene may select from the Oncology Pool those Research Compounds
and/or Active  Compounds which Celgene  desires,  and in good faith intends,  to
develop as  products in the  Oncology  Field,  and shall give  prompt  notice to
Novartis of each compound which has been so selected. The Research Compounds and
Active  Compounds  selected by Celgene from the Oncology Pool for development as
products in the Oncology  Field shall be noted in the minutes of the RMC meeting
immediately  succeeding  such  selection.  Celgene  may in its  sole  discretion
develop  and  commercialize  products  containing  any  such  selected  Research
Compound or Active  Compound in the Oncology  Field.  Celgene  shall  regularly,
promptly  and in good  faith  notify  Novartis  in  writing  of  those  Research
Compounds and/or Active Compounds as to which Celgene is no longer pursuing,  or
does not  intend  to  pursue,  development  in the  Oncology  Field.  Upon  such
notification  with respect to an Active  Compound,  such Active  compound  shall
automatically  be excluded  from the Oncology Pool and included in the Remaining
Pool, subject to the provisions of Sections 5.3 and 5.4. On a regular and prompt
basis during the Research Term,  Celgene shall  determine in good faith which of
the Research  Compounds  and/or  Active  Compounds  in the Oncology  Pool are no
longer viable candidates for further development and  commercialization  for use
in the Oncology Field (which  determination shall be noted in the minutes of the
applicable RMC meeting),  and, upon such determination,  such Research Compounds
or Active  Compounds shall  automatically be excluded from the Oncology Pool and
included in the Remaining Pool.

          (B)  Novartis  shall have the right to conduct  research  outside  the
Oncology  Field with respect to Research  Compounds and Active  Compounds in the
Oncology Pool,  provided that so long as such  compounds  remain in the Oncology
Pool, they shall remain subject to the provisions of Section 5.2(a).

          (C) Any Research  Compounds and Active  Compounds  remaining in the on
Oncology  Pool as the  expiration  of the  Research  Term  which  have  not been
selected by Celgene for development and  commercialization in the Oncology Field
shall,  upon such expiration,  automatically be excluded from the Oncolgoy Pool
and included in the Remaining Pool.

                                       15

<PAGE>

     5.3 SELECTION AND DEVELOPMENT OF COMPOUNDS BY NOVARTIS WITHIN THE REMAINING
POOL IN ADDITIONAL FIELDS (ADDITIONAL PRODUCTS).

          (A) During the term of this Agreement,  Novartis may conduct  research
and development on Research  Compounds and Active Compounds within the Remaining
Pool in one or more Additional  Fields to determine  whether one or more of such
compounds  meet the  criteria  Novartis  applies to  compounds  to  qualify  for
selection as Candidate  Compounds for development as Final Selected Compounds or
for  designation as Back-Up  Compounds  therefor as Additional  Products in such
Additional Field(s). Novartis shall keep Celgene informed, in writing, as to the
progress of the research and  development  of all such  Research  Compounds  and
Active Compounds,  including,  without limitation, the Additional Field(s) being
pursued by Novartis with respect thereto.

          (B)  Novartis  may  select  from the  Remaining  Pool  those  Research
Compounds  and/or Active  Compounds  which Novartis  desires,  and in good faith
intends,  to declare as Candidate  Compounds for  development  as Final Selected
Compounds (or Back-Up Compounds  therefor) as Additional Products in one or more
Additional  Fields,  and shall give  prompt  notice to Celgene of each  compound
which has been selected as a Candidate  Compound or Final  Selected  Compound or
Back-Up Compound,  including,  without limitation, the Additional Field(s) being
pursued by Novartis with respect thereto.  Novartis hereby agrees that it shall
not be  permitted to file an IND for the  applicable  Additional  Field(s)  with
respect to any Research  Compound or Active  Compound  hereunder  without  first
designating such compound as a FInal Selected Compound or Back-Up Compound.  The
Candidate   Compounds  and  Final  Selected   Compounds  and  Back-Up  Compounds
identified by Novartis as such from the Remaining  Pool during the Research Term
shall be noted in the minutes of the RMC  meeting  immediately  succeeding  such
identification,  together with the applicable  Additional Field(s) for each such
compounds.  To the extent that Novartis  identifies  any Candidate  Compound or
Final  Selected  Compound or Back-Up  Compound from the Remaining Pool after the
expiration of the Research  Term,  Novartis  shall  provide  Celgene with prompt
written notice of such  identification and the applicable  Additional  Field(s).
Novartis  shall  use  its  commercially   reasonable  efforts  to  conduct  such
preclinical  and  human  clinical  trials  of Final  Selected  Compounds  in the
applicable Additional Field(s) as Novartis determines are necessary or desirable
to obtain Regulatory Approvals to manufacture and market Products  incorporating
such Final  Selected  Compound in such  Additional  field(s)  in the  Territory.
Novartis  shall use its  commercially  reasonable  efforts to seek all necessary
Regulatory  Approvals  required  for  marketing  a  Product  in such  Additional
Field(s) in the Major Markets and such other  countries  where Novartis  markets
its own products of similar commercial potential.

          (C)  Novartis  shall keep  Celgene  informed as to the progress of the
development of all Final Selected Compounds and Primary and Additional  Products
in any  Additional  Field by providing to Celgene  reasonably  detailed  written
six-monthly  reports which shall  describe the progress of the  development  and
regulatory  filings  with  respect  to  Candidate  Compounds  or Final  Selected
Compounds or Products, as applicable.

     5.4 SELECTION AND  DEVELOPMENT  OF COMPOUNDS  WITHIN THE REMAINING  POOL BY
CELGENE IN ADDITIONAL FIELDS.

          (A) Subject to the  provisions of Sections  6.1(a) and 6.1(b)  hereof,
Celgene may, at any time during the term of this  Agreement,  notify Novartis of
Celgene's  interest in pursuing  research and development of Research  Compounds
and/or Active Compounds

                                       16
<PAGE>

included in the Remaining  Pool (to the extent that such  compounds are not then
Candidate Compounds or Final Selected Compounds or Back-Up Compounds of Novartis
in one or more  Additional  Fields) in any  Additional  Field  which is not then
being pursued by Novartis,  as reflected in Novartis'  six-monthly reports under
Sections 5.1(d) and 5.3(c).  Promptly  following such notice,  the Parties shall
discuss in good faith their respective  interests in pursuing such compounds and
such Additional  Field and, if Novartis is neither  pursuing,  nor in good faith
planning to commence,  research and development of (x) any Research Compounds or
Active Compounds in such Additional  Field and (y) such Research  Compound(s) or
Active  Compound(s),  as the  case may be,  in any  Additional  Field,  then (i)
Celgene shall have the right to pursue research and development of such Research
Compound(s)  and/or Active  Compound(s)  within the Remaining  Pool that are not
being  pursued by Novartis in such  Additional  Field and to  commercialize  any
resulting products (''CELGENE PRODUCTS'') in such Additional Field, and (ii) for
so long as Celgene is using  commercially  reasonable  and  diligent  efforts to
develop  and  commercialize  Celgene  Products  in such  Additional  Field,  the
Research  Compound(s)  and/or  Active  Compound(s)  contained  in  such  Celgene
Products  shall be excluded from the license  granted to Novartis  under Section
6.2(a).

          (B) In the event that  during the term of this  Agreement,  subject to
the provisions of Sections  6.1(a) and 6.1(b) hereof,  Celgene  desires to grant
any development and commercialization license to a Third Party with respect to a
Celgene  Product in its  applicable  Additional  Field,  Celgene  shall  provide
Novartis with written notice thereof and hereby grants  Novartis the first right
of negotiation with respect to such Celgene Product in the applicable Additional
Field in accordance with this Section 5.4(b).  With respect to each such Celgene
Product that Celgene may offer pursuant to this Section  5.4(b),  Novartis shall
within thirty (30) business days after receipt of such notice notify  Celgene in
writing either that (i) Novartis is interested in  negotiating  for an exclusive
commercialization license with respect to such Celgene Product in the applicable
Additional  Field or (ii)  Novartis  has no interest and  therefore  waives such
right of first  negotiation.  If Novartis  notifies Celgene within (30) business
days that  Novartis  desires to negotiate  for such  license,  the parties shall
negotiate  in good faith for up to ninety  (90) days from such  notification  or
such longer period as agreed between the Parties regarding the terms pursuant to
which Novartis would obtain such license.  Failure by Novartis to give notice of
its interest or lack of interest in negotiating for such license with respect to
a Celgene  Product  within  thirty (30)  business  days after receipt of written
notice from Celgene as described  in the first  sentence of this Section  5.4(b)
shall be  deemed  to  constitute  a waiver  by  Novartis  of its  right of first
negotiation  with respect to such Celgene Product.  In addition,  failure of the
Parties to agree within such ninety(90) day  negotiation  period (or such longer
period as agreed  between the Parties) shall be deemed to constitute a waiver by
Novartis of such right of first negotiation. If Novartis waives or its deemed to
waive its right of first  negotiation  with respect to any such Celgene Product,
then Celgene shall be free to license such Celgene  Product to a Third Party and
Novartis shall have no further rights with respect to such Celgene Product.

          (C) Any Research Compound,  Active Compound and/or Additional Field to
which a Party obtains  rights under  Sections 5.1 through 5.4 (whether by notice
or by failure to provide  notice within the allowed time period,  if any) during
the Research  Term shall be noted in the minutes of the RMC meeting  immediately
succeeding such event. Any Research Compound.  Active Compound and/or Additional
Field to which a Party obtains rights under Sections 5.1 through 5.4 (whether by
notice or by failure to provide notice within

                                       17
<PAGE>

the allowed time period,  if any) after the Research Term shall be documented in
a writing signed by each Party.

    5.5 CV ASSAY.

         (A) Novartis  hereby  acknowledges  that Celgene has  developed  the CV
Assay and agrees that,  notwithstanding  any other  provision of this Agreement,
Celgene shall have the right, in its sole discretion and at its expense,  to use
the CV Assay outside the Research  Program to conduct  optimization  and related
activities  with respect to Research  Compounds  (excluding  Research  Compounds
within the SP500263  Series).  The  foregoing  right shall not affect  Novartis'
rights  under this  Agreement  to optimize  Research  Compounds,  whether or not
within the SP500263 Series, for cardiovascuylar  properties or indications using
Novartis  resources.  Promptly  following  the  Effective  Date,  Celgene  shall
disclose information  regarding the CV Assay to Novartis,  and the parties shall
discuss in good faith a separate  collaborative  arrangement with respect to the
CV Assay  should  Novartis  have  interest  in such an  arrangement.  Except  as
expressly set forth in a written  agreement  memorializing  such an arrangement,
Novartis  shall have no right or license to use,  or to cause  Celgene to use on
its behalf, the CV Assay.

          (B) In the  event  that  the  Parties  do not  enter  into a  separate
collaborative  arrangement  with respect to the CV Assay and, during the term of
this  Agreement,  Celgene  desires to grant any  commercialization  license to a
Third Party with respect to a Research  Compound  discovered  through the use of
the CV Assay in the CV Field, Celgene shall provide Novartis with written notice
thereof and hereby grants  Novartis the first right of negotiation  with respect
to such  Research  Compound  in the CV Field in  accordance  with  this  Section
5.5(b).  With  respect to each such  Research  Compound  that  Celgene may offer
pursuant to this Section 5.5(b). Novartis shall within thirty (30) business days
after receipt of such notice notify  Celgene in writing either that (i) Novartis
is interested in  negotiating  for an exclusive  commercialization  license with
respect  to such  Research  Compound  in the CV  Field or (ii)  Novartis  has no
interest  and  therefore  waives  such right of first  negotiation,  if Novartis
notifies  Celgene  within thirty (30)  business  days that  Novartis  desires to
negotiate for such license,  the parties shall negotiate in good faith for up to
ninety (90) days from such  notification or such longer period as agreed between
the Parties  regarding the terms  pursuant to which  Novartis  would obtain such
license.  Failure by Novartis to give notice of its interest or lack of interest
in  negotiating  for such  license with  respect to any such  Research  Compound
within thirty (30) business days after receipt of written notice from Celgene as
described  in the  first  sentence  of this  Section  5.5(b)  shall be deemed to
constitute a waiver by Novartis of its right of first  negotiation  with respect
to such Research Compound.  In addition,  failure of the Parties to agree within
such ninety (90) day negotiation period (or such longer period as agreed between
the Parties) shall be deemed to constitute a waiver by Novartis of such right of
first  negotiation.  If Novartis waives or is deemed to waive its right of first
negotiation with respect to any such Active Compound, then Celgene shall be free
to license such Research  Compound to a Third Party in the CV Field and Novartis
shall have no further rights with respect to such Research Compound.

     6. LICENSE GRANTS

     6.1 RESEARCH TERM LICENSE GRANTS.

         (A)  GRANTS BY  CELGENE.  Subject  to the terms and  condition  of this
Agreement:

                                       18

<PAGE>

              (i)  Celgene  hereby  grants  to  Novartis  and its  Affiliates  a
worldwide, non-exclusive, non-transferable, royalty-free research license during
the Research  Term under  Celgene  Patent  Rights,  Celgene's  interest in Joint
Patent  Rights and  Know-How of Celgene  solely for the purpose of carrying  out
Novartis' responsibilities under the Research Program.

              (ii)  Celgene  hereby  grants to  Novartis  and its  Affiliates  a
worldwide non-exclusive, non-transferable,  royalty-free research license during
the Research  Term under  Celgene  Patent  Rights,  Celgene's  interest in Joint
Patent  Rights and  Know-How  of Celgene  solely for the  purpose of  conducting
research in one or more Additional Fields.

         (B) GRANT BY  NOVARTIS.  Subject  to the terms and  conditions  of this
Agreement,  Novartis  hereby  grants to Celgene and its  Affiliates a worldwide,
non-exclusive   non-transferable,   royalty-free  research  license  during  the
Research Term under Novartis Patent Rights,  Novartis'  interest in Joint Patent
Rights and Know-How of Novartis solely for the purpose of carrying out Celgene's
responsibilities under the Research Program.

     6.2 ADDITIONAL RESEARCH AND COMMERCIALIZATION LICENSE GRANTS.

         (A) GRANT BY  CELGENE.  Subject  to the terms  and  conditions  of this
Agreement (including,  without limitation, the obligations under Sections 6.4(a)
and (b)), Celgene hereby grants to Novartis and its Affiliates (x) an exclusive,
royalty-bearing  license in the Territory,  with the right to sublicense,  under
Celgene Patent Rights, Celgene's interest in Joint Patent Rights and Know-How of
Celgene to  develop,  make,  have  made,  use,  sell,  offer for sale and import
Products  in  all  Fields  of  Use,  and  (y)  non-exclusive,  non-transferable,
royalty-free  research  license in the Terriroty  under Celgene  Patent  Rights,
Celgene's interest in Joint Patent Rights and Know-How of Celgene solely for the
purpose  of  conducting  research  on  Research  Compounds,   Active  Compounds,
Candidate  Compounds,  Final  Selected  Compounds  and Back-Up  Compounds in all
Fields of Use; provided, however, that:

              (i) with respect to Additional  Products,  Novartis' license under
this Section 6.2(a) to develop,  make, have made, use, sell,  offer for sale and
import such Additional  Products in any Additional Field shall be subject to the
provisions of Sections 5.2, 5.3 and 5.4; and

              (ii) with respect to Primary  Products,  Novartis shall be free to
develop,  make,  have made,  use,  sell,  offer for sale and import such Primary
Products in any  Additional  Field,  but  Novartis'  license  under this Section
6.2(a) to  develop,  make,  have made,  use,  sell,  offer for sale and import a
Primary Product in the Oncology Field shall become effective

                   (1) for the  prevention  of  cancer,  only upon  start of the
Phase III Clinical Studies with such Primary Product in the Primary Field; and

                   (2) for the therapy of cancer: only upon the First Commercial
Sale of such Primary Product in a Major Market in the Primary Field.

         (B) GRANT BY  NOVARTIS.  Subject  to the terms and  conditions  of this
Agreement,  Novartis  hereby grants to Celgene and its  Affiliates an exclusive,
fully-paid  license  in the  Territory,  with  the  right to  sublicense,  under
Novartis Patent Rights, Novartis'

                                       19
<PAGE>

interest in Joint Patent Rights and Know-How of Novartis to develop,  make, have
made, use, sell, offer for sale and import:

         (i) pharmaceutical  products  containing  Research Compounds and Active
Compounds  selected by Celgene from the Oncology Pool pursuant to Section 5.2 in
the Oncology Field; and

         (ii) Celgene Products in each Additional Field to which Celgene obtains
rights under Section 5.4.

     6.3  SUBLICENSING.  Novartis shall inform Celgene of each sublicense  under
the  license  granted in Section  6.2(a)  above  promptly  after  granting  such
sublicense.  Celgene shall inform Novartis of each sublicense  under the license
granted in Section  6.2(b) above promptly  after  granting such  sublicense.  No
sublicense shall relieve a Party of any obligations  under this Agreement.  Each
Party shall ensure that the rights of the other Party are not adversely affected
by any sublicense granted pursuant to this Section 6.3.

     6.4 EXCLUSIVITY.

         (A) As long as Novartis  is using  commercially  reasonable  efforts to
diligently  develop  and/or  commercialize  at least one Primary  Product in the
Primary Field;

             (i) the  licenses  granted  to  Novartis  in Section  6.2(a)  shall
continue to be effective with respect to any Candidate Compounds, Final Selected
Compound or Back-Up  Compound  licensed  to Novartis in the Primary  Field under
this  Agreement,  subject to the milestone and royalty  payment  obligations  of
Novartis described in Article 7; and

             (ii)  Celgene  shall not  develop,  make,  have made,  use and sell
itself or through a Third Party and Er(alpha)-Selective  compound for use within
the Primary Field.

         (B) As long as Novartis  is using  commercially  reasonable  efforts to
diilgently  develop  and/or  commercialize  at least one Primary  Product in the
Primary  Field  (unless  for such  Product  initially  developed  for use in the
Primary Field, development in the Primary Field is subsequently discontinued for
scientific, commercial or strategic reasons) and at least one Additional Product
in a specific Additional Field;

             (i) the  licenses  granted  to  Novartis  in Section  6.2(a)  shall
continue  to be  effective  with  respect to any  Candidate  Compounds  or Final
Selected  Compound or Back-Up  Compound  licensed to Novartis in such Additional
Field  under  this  Agreement,  subject to the  milestone  and  royalty  payment
obligations of Novartis described in Article 7; and

             (ii)  Celgene  shall not  develop,  make,  have made,  use and sell
itself or through a Third Party and Er(alpha)-Selective  compound for use within
such Additional  Field;  provided;  however,  that Celgene shall be permitted to
pursue  the  development  and  commercialization  in the CV  Field  of  Research
Compounds  (excluding  Research Compounds within the SP500263 Series) discovered
through the use of the CV Assay in accordance with Section 5.5 hereof.

         (C)  Novartis  shall  be  deemed  to be using  commercially  reasonable
efforts  with  respect  to the  provisions  of  Section  6.4(a) and (b) above if
Novartis is actively

                                       20

<PAGE>
undertaking diligent, commercially reasonable efforts, similar to those used for
other Novartis products of comparable commercial  potential,  for the continuing
development and the  commercialization  of a Product in the applicable  Field of
Use, including,  without limitation,  the development and/or optimization and/or
further  characterization of Active Compounds within the Primary Pool, Candidate
Compounds  and/or  Final  Selected  Compounds  and/or  Products  to  which it is
licensed under Section 6.2(a),  the performance of an active derivation and lead
optimization  program with respect to Active  Compounds within the Primary Pool,
the designation of Candidate  Compounds and Final Selected Compounds and Back-Up
Compounds,  initiation of clinical trials,  submission of regulatory filings and
commercial launch of a Product.

              (d) In the event  Novartis  fails to use  commercially  reasonable
efforts as provided in Section 6.4(a) or (b) above,  as such efforts are defined
in Section  6.4(c),  and provided  that Novartis is not prevented in meeting its
obligations to use commercially reasonable efforts by force majeure,  government
regulation or intervention  or institution of a lawsuit by a Third Party),  then
Novartis'  licenses to those  indications in the Field of Use for which Novartis
fails to use commercially  reasonable  efforts shall terminate and Celgene shall
be free to research,  develop and commercialize such Research  Compound,  Active
Compound,  Final Selected Compound,  Back-Up Compound or Product alone or with a
Third Party in the applicable Field of Use.

              (e) During the Research Term,  Novartis shall provide  information
regarding its commercially  reasonable  efforts under Sections 6.4(a) and (b) to
the RMC on a quarterly  basis.  Thereafer,  during the  remainder of the term of
this  Agreement,   Novartis  shall  on  at  least  a  quarterly   basis  provide
documentation  to the reasonable  satisfaction of Celgene that Novartis is using
commercially  reasonable  efforts with respect to all Final Selected  Compounds,
Back-Up Compounds and Products.

7.        PAYMENTS

          7.1 UPFRONT FEE. In partial consideration of the grant of the licenses
set forth in Sections 6.1(a) and 6.2(a) above, Novartis agrees to pay to Celgene
on the Effective Date (subject to Section 8.1(a)) a one-time, non-refundable fee
of ten million U.S. dollars ($10,000,000).

          7.2 MILESTONE PAYMENTS.

              (a)  PRECLINICAL  MILESTONE.  Novartis  shall pay to  Celgene  the
nonrefundable  milestone  payment set forth  below in  accordance  with  Section
8.1(a):

         -----------------------------------------------------------------------
          MILESTONE EVENT                                    MILESTONE PAYMENT

          Designation of the first Final Selected Compound     $1.0 million
          in the Primary Field
         -----------------------------------------------------------------------

The foregoing milestone payment shall be payable only once.

              (b)   CLINICAL   MILESTONES.   With   respect   to  each   Product
(irrespective  of the Field of Use in which such event  occurs),  Novartis shall
pay  to  Celgene  the  nonrefundable  milestone  payments  set  forth  below  in
accordance with Section 8.1(a):

                                       21

<PAGE>

         -----------------------------------------------------------------------
          MILESTONE EVENT                                   MILESTONE PAYMENT
         -----------------------------------------------------------------------
          Submission of IND for Product                        $3.0 million
         -----------------------------------------------------------------------
          Commencement of Phase II Clinical Trials of Product  $2.0 million
         -----------------------------------------------------------------------
          Commencement of Phase III Clinical Trials of Product $4.0 million
         -----------------------------------------------------------------------
          Submission of an NDA for Product                     $6.0 million
         -----------------------------------------------------------------------
          Regulatory Approval of Product in the United States  $8.0 million
         -----------------------------------------------------------------------
          Regulatory Approval of Product in a Major Market     $4.0 million
          other than the United States or Japan
         -----------------------------------------------------------------------
          Regulatory Approval of Product in Japan              $2.0 million
         -----------------------------------------------------------------------

provided,  however,  that if (i) a Product is abandoned during development after
one or more of the milestone  payments  under this Section  7.2(b) has been made
and (ii) a Product  comprising or containing a Back-Up Compound is developed for
the same indication as the abandoned Product to replace such abandoned  Product,
then only those  milestone  payments  under this  Section  7.2(b)  that were not
previously  made with respect to such  abandoned  Product  shall be payable with
respect to the Product comprising or containing such Back-Up Compound.  Payments
made to Celgene pursuant to this Section 7.2 are  non-refundable  and may not be
credited  against any other  payments  payable by Novartis to Celgene under this
Agreement.

         7.3  ROYALTIES.  Subject to the  provisions of this Article 7, Novartis
shall pay to Celgene  royalties on Net Sales of Products in the Territory at the
following rates:

              (a) Ten percent (10%) of that portion of total annual Net Sales of
Products that is less than $500 million;

              (b) Eleven percent (11%) of that portion of total annual Net Sales
of  Products  that is equal to or  greater  than $500  million  but less than $1
billion; and

              (c) Twelve percent (12%) of that portion of total annual Net Sales
of Products that is equal to or greater than $1 billion.

provided,  however,  that royalties under this Section 7.3 shall be payable on a
country-by-country  basis for the longer of (i) the period that such  Product or
its manufacture, use or sale is covered by a Valid Claim in such country or (ii)
ten (10) years from the date of First  Commercial  Sale of such  Product in such
country (the "ROYALTY TERM").

         7.4 THIRD PARTY  ROYALTIES.  With respect to payment of royalties under
Third Party  licenses that are  necessary for Novartis'  practice of the license
granted by Celgene  under  Section  6.2(a).  Novartis  may reduce the  royalties
otherwise  owing to Celgene  hereunder on Net Sales of Products by forty percent
(40%) of the royalty  payments  made under such Third Party  license;  provided,
however,  that the royalties  otherwise  payable to Celgene under this Agreement
shall not be reduced by more than thirty percent (30%).

                                       22

<PAGE>


8.       PAYMENTS; REPORTS; AUDITS

         8.1 PAYMENT; REPORTS.

             (a) Upfront Fee and Milestone  Payments:  The payment to be made by
Novartis  to  Celgene  pursuant  to  Section  7.1  shall be made on or after the
Effective Date within ten (10) days of receipt of an invoice from Celgene, which
invoice may be delivered in advance of the  Effective  Date.  All payments to be
made by Novartis to Celgene  pursuant to Sections 7.2 and 12.2(a)  shall be made
within twenty (20) business days of receipt of an invoice from Celgene. Novartis
shall  promptly  (and in any event  within  (5)  business  days)  following  the
occurrence of any event triggering a milestone  payment under Section 7.2 above,
notify Celgene in writing of such occurrence.

             (b) Royalty Payments and Reports:  Royalty payments and reports for
the sale of Products shall be calculated and reported for each calendar quarter.
All royalty  payments due to Celgene under this  Agreement  shall be paid within
sixty  (60)  days  of  the  end  of  each  calendar  quarter,  unless  otherwise
specifically  provided herein. Each payment of royalties shall be accompanied by
a report of Net Sales of Products in sufficient detail to permit confirmation of
the accuracy of the royalty payment made, including, without limitation and on a
country-by-country  basis,  the Net  Sales  of  Products  in Swiss  Francs,  the
royalties,  in U.S. dollars,  payable,  the method used to calculate the royalty
and the exchange rates used.

         8.2 EXCHANGE RATE; MANNER AND PLACE OF PAYMENT.  All payments hereunder
shall  be  payable  in U.S.  dollars.  With  respect  to each  quarter,  for the
countries other than the United States, whenever conversion of payments from any
foreign currency shall be required, such conversion shall be made at the rate of
exchange  broadly  applied  by  the  Novartis  Group  to  all  foreign  currency
conversions  into  U.S.  dollars,  on the last  business  day of the  applicable
quarter.  All payments owed under this Agreement  shall be made by wire transfer
to a bank and  account  designated  in  writing  by  Celgene,  unless  otherwise
specified in writing by Celgene.

         8.3 PROHIBITED  PAYMENTS.  Notwithstanding  any other provision of this
Agreement,  if Novartis is  prevented  from paying any such royalty by virtue of
the statutes,  laws, codes or governmental regulations of the country from which
the payment is to be made, then such royalty may be paid by depositing  funds in
the  currency in which  accrued to  Celgene's  account in a bank  acceptable  to
Celgene in the country whose currency is involved.

         8.4 LATE PAYMENTS.  In the event that any payment,  including  royalty,
milestone and research payments, due hereunder is not made when due, the payment
shall accrue interest from the date due at the rate of one and one-half  percent
(1.5%) per month; provided, however, that in no event shall such rate exceed the
maximum legal annual interest rate. The payment of such interest shall not limit
a Party from  exercising  any other rights it may have as a  consequence  of the
lateness of the payment;  provided,  however,  that any late payment will not be
considered  a material breach of this Agreement unless such payment is more than
three (3) months overdue.

         8.5 TAXES. The party receiving  royalties and other payments under this
Agreement  will pay any and all taxes levied on account of such payment.  If any
taxes are required to be withheld by the paying  party,  it will (a) deduct such
taxes from the remitting payment,  (b) timely pay the taxes to the proper taxing
authority,  and (c) send  proof of payment to the other  Party and  certify  its
receipt by the taxing authority within sixty (60) days following such payment.


                                       23

<PAGE>



         8.6 RECORDS AND AUDITS. During the Royalty Term and for a period of six
(6)  years  thereafter,  Novartis  shall  keep  complete  and  accurate  records
pertaining  to the  development  and sale or other  disposition  of  Products in
sufficient  detail to permit Celgene to confirm the accuracy of all payments due
hereunder.  Celgene  shall  have the  right to cause an  independent,  certified
public  accountant  reasonably  acceptable  to Novartis to audit such records to
confirm Net Sales and royalty and other payments for a period  covering not more
than the preceding three (3) years.  Such audits may be exercised  during normal
business  hours  upon  reasonable  prior  written  notice  to  Novartis.  Prompt
adjustments  shall be made by the  Parties to reflect the results of such audit.
Celgene  shall bear the full cost of such audit  unless  such audit  discloses a
variance  of more than  five  percent  (5%) from the  amount of the Net Sales or
royalties or other  payments due under this  Agreement.  In such case,  Novartis
shall bear the full cost of such audit and shall  promptly  remit to Celgene the
amount of any underpayment.

9.       INVENTIONS AND PATENTS.

         9.1 OWNERSHIP OF  INVENTIONS.  Ownership of inventions  conceived of or
reduced to practice in the course of the Research Program  ("INVENTIONS")  shall
be determined in accordance with the rules of  inventorship  under United States
patent  laws.  Celgene  shall own all  Inventions  conceived  of and  reduced to
practice  during the Research Term solely by its employees and agents  ("CELGENE
INVENTIONS"),   and  all  patent   applications  and  patents  claiming  Celgene
Inventions  ("Celgene  Patent  Rights").   Novartis  shall  own  all  Inventions
conceived  of and reduced to  practice  during the  Research  Term solely by its
employees and agents ("NOVARTIS  INVENTIONS"),  and all patent  applications and
patents claiming Novartis Inventions ("Novartis Patent Rights").  All inventions
conceived  of and reduced to practice  jointly by employees or agents of Celgene
and employees or agents of Novartis ("JOINT INVENTIONS"), and all Joint Patents,
shall be owned jointly by Celgene and Novartis ("Joint Patent Rights").

         9.2  PROSECUTION AND MAINTENANCE OF PATENT RIGHTS.

              (a) Celgene  shall be  responsible,  at its own  expense,  for the
filing,  prosecution  and  maintenance  of all patent  applications  and patents
within the Celgene Patent  Rights.  Novartis  shall be  responsible,  at its own
expense, for the filing,  prosecution and maintenance of all patent applications
and patents within the Novartis Patent Rights. Each Party shall consider in good
faith the requests and suggestions of the other Party with respect to strategies
for filing,  prosecuting and maintaining  such patent  applications and patents.
The  responsible  Party  shall keep the other Party  informed  of progress  with
regard to the  filing,  prosecution,  maintenance,  enforcement  and  defense of
patents  applications  and patents subject to this Section 9.2(a).  In the event
that  Celgene  desires to abandon any patent  application  or patent  within the
Celgene  Patent  Rights that  claims a Celgene  Invention,  or if Celgene  later
declines responsibility for any such patent application or patent, Celgene shall
provide reasonable prior written notice to Novartis of such intention to abandon
or decline  responsibility,  and  Novartis  shall  have the  right,  but not the
obligation,  as its own expense,  to file,  prosecute,  and maintain such patent
application or patent.

              (b) The Parties shall  determine by mutual  agreement which Party
shall be responsible  for the  filing,  prosecution  and  maintenance  of patent
applications and patents

                                       24

<PAGE>

within  the Joint  Patent  Rights on a case by case  basis.  In the event that a
party  responsible  for the filing,  prosecution  and  maintenance of any patent
application  or patent  within the Joint Patent  Rights  desires to abandon such
patent application or patent, or if such Party later declines responsibility for
such patent  application or patent,  such Party shall provide  reasonable  prior
written  notice  to the other  Party of its  intention  to  abandon  or  decline
responsibility,  and  the  other  Party  shall  have  the  right,  but  not  the
obligation,   to  prepare,  file,  prosecute,   and  maintain  any  such  patent
application  or patent within the Joint Patent  Rights.  The Parties shall share
equally  the costs of  filing,  prosecuting  and  maintaining  patents or patent
applications within the Joint Patent Rights.

         9.3 COOPERATION OF THE PARTIES. Each Party agrees to cooperate fully in
the  preparation,  filing,  and  prosecution  of any  Patent  Rights  under this
Agreement. Such cooperation includes, but is not limited to:

              (a)  executing  all  papers  and  instruments,  or  requiring  its
employees  or  agents,   to  execute  such  papers  and  instruments,  so  as to
effectuate the ownership of Patent Rights set forth in Section 9.1 and to enable
the  other  Party to  apply  for and to  prosecute  patent  applications  in any
country;

              (b) promptly  informing  the other Party of any matters  coming to
such Party's  attention that may affect the preparation,  filing, or prosecution
of any such patent applications; and

              (c) in the  event  that  applicable  law  in  any  country  of the
Territory  provides for the extension of the term of any Celgene  Patent Rights,
Novartis Patent Rights or Joint Patent Rights, applying for and using reasonable
efforts to obtain such an extention and cooperating in obtaining such extension.

         9.4  INFRINGEMENT  OF THIRD PARTY  RIGHTS.  Celgene and Novartis  shall
promptly notify the other in writing of any allegation by a Third Party that the
exercise by either of the Parties of any license granted hereunder  infringes or
may infringe the intellectual property rights of such Third Party. Celgene shall
have the right to control the defense of any claims with  respect to the Celgene
Patent  Rights at its own  expense  and by counsel of its own  choice.  Novartis
shall have the right to control the  defense of any claims  with  respect to the
Novartis  Patent Rights at its own expense and by counsel of its own choice.  In
the event that such  matter  includes  claims with  respect to the Joint  Patent
Rights,  the Party responsible for prosecution and maintenance of the applicable
Joint  Patent  Rights under  Section  9.2(b) shall have the right to control the
defense of such claims by counsel of its own choice and the Parties  shall share
equally the costs with respect thereto.  If Celgene fails to proceed in a timely
fashion  with regard to the  defense of any claims  with  respect to the Celgene
Patent Rights that are likely to have a material  adverse  effect on any Product
being  developed or  commercialized  by Novartis  pursuant to a license  granted
hereunder,  Novartis  shall have the right to control  any such  defense of such
claim at its own  expense and by counsel of its own  choice,  and Celgene  shall
have the right,  at its own  expense,  to be  represented  in any such action by
counsel of its own choice. If Novartis fails to proceed in a timely fashion with
regard to the defense of any claims with respect to the Novartis  Patent  Rights
that are likely to have a material adverse effect on any product being developed
or  commercialized by Celgene pursuant to a license granted  hereunder,  Celgene
shall  have the  right to  control  any such  defense  of such  claim at its own
expense and by counsel of its own choice,  and Novartis shall have the right, at
its own  expense,  to be  represented  in any such  action by counsel of its own
choice.  If the responsible  Party with respect to any Joint Patent Rights fails
to proceed

                                       25

<PAGE>

in a timely fashion with regard to the defense of any claims with respect to the
Joint  Patent  Rights,  the other Party shall have the right to control any such
defense of such claim at its own expense  and by counsel of its own choice,  and
the first Party shall have the right,  at its own expense,  to be represented in
any such action by counsel of its own choice. Neither Party shall have the right
to settle any patent infringement  litigation under this Section 9.4 in a manner
that  diminishes  the rights or interests  of the other Party or  obligates  the
other  Party to make any payment or take any action  without  the prior  written
consent of such other Party.

         9.5 INFRINGEMENT BY THIRD PARTIES.  Celgene and Novartis shall promptly
notify the other in writing of any  alleged or  threatened  infringement  of any
patent  included in the Celgene Patent Rights,  Novartis  Patent Rights or Joint
Patent  Rights of which they become  aware.  Both  Parties  shall use their best
efforts in cooperating  with each other to terminate such  infringement  without
litigation.  Celgene  shall  have the right to bring and  control  any action or
proceeding  with respect to  infringement  of any patent included in the Celgene
Patent  Rights at its own  expense  and by counsel of its own  choice.  Novartis
shall have the right to bring and control any action or proceeding  with respect
to  infringement of any patent included in the Novartis Patent Rights at its own
expense  and by counsel of its own choice.  In the event any patent  included in
the Joint Patent Rights is infringed by a Third Party, the Party responsible for
prosecution and maintenance of the applicable  Joint Patent Rights under Section
9.2(b) shall have the right to bring and control any action or  proceeding  with
respect to such  patent,  and the Parties  shall share  equally in the  expenses
thereof.  With  respect to  infringement  of any patent  included in the Celgene
Patent  Rights that is likely to have a material  adverse  effect on any Product
being  developed or  commercialized  by Novartis  pursuant to a license  granted
hereunder,  if Celgene fails to bring an action or  proceeding  within (a) sixty
(60) days  following  the  notice of alleged  infringement  or (b) ten (10) days
before the time limit, if any, set forth in the appropriate laws and regulations
for the filing of such actions,  whichever comes first,  Novartis shall have the
right to bring and  control any such action at its own expense and by counsel of
its own choice,  and Celgene  shall have the right,  at its own  expense,  to be
represented  in any such  action by counsel of its own choice.  With  respect to
infringement of any patent included in the Novartis Patent Rights that is likely
to  have  a  material   adverse  effect  on  any  product  being   developed  or
commercialized by Celgene pursuant to a license granted  hereunder,  if Novartis
fails to bring an action or proceeding  within (a) sixty (60) days following the
notice of alleged  infringement  or (b) ten (10) days before the time limit,  if
any, set forth in the  appropriate  laws and  regulations for the filing of such
actions,  whichever  comes  first,  Celgene  shall  have the  right to bring and
control any such action at its own expense and by counsel of its own choice, and
Novartis shall have the right, at its own expense, to be represented in any such
action by counsel of its own choice.  With respect to infringement of any patent
included in the Joint Patent Rights,  if the responsible Party fails to bring an
action or proceeding  within (a) sixty (60) days following the notice of alleged
infringement  or (b) ten (10) days before the time limit,  if any,  set forth in
the appropriate  laws and regulations for the filing of such actions,  whichever
comes first,  the other Party shall have the right to bring and control any such
action at its own expense and by counsel of its own choice,  and the first Party
shall have the right,  at its own expense,  to be represented in any such action
by  counsel  of its own  choice.  In the event a Party  brings  an  infringement
action,  the other Party shall cooperate  fully,  including if required to bring
such action, the furnishing of a power of attorney. Neither Party shall have the
right to settle any patent  infringement  litigation under this Section 9.5 in a
manner that  diminishes the rights or interests of the other Party without prior
written  consent  of such  other  Party.  Except as  otherwise  agreed to by the
Parties as part of a cost-sharing arrangement, any recovery realized as a result
of such litigation, after reimbursement of any litigation expenses of

                                       26

<PAGE>

Celgene and Novartis, shall belong to the Party who brought the action, provided
that any such recovery  realized by Novartis and  representing  damages for lost
sales of Products shall be treated as Net Sales for purposes of this Agreement.

10.      CONFIDENTIALITY; PUBLICATIONS

         10.1 CONFIDENTIALITY. Except to the extent expressly authorized by this
Agreement or otherwise agreed in writing by the Parties, the Parties agree that,
for the term of this Agreement and for five (5) years thereafter,  the receiving
Party (the "RECEIVING  PARTY") 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  Information  furnished  to it by the other  Party  (the
"DISCLOSING PARTY") pursuant to this Agreement (the "CONFIDENTIAL  INFORMATION")
unless the Receiving Party can demonstrate by contemporaneous, 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  Disclosing
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 the breach of the Agreement;

              (d) was  disclosed  to the  Receiving  Party,  other than under an
obligation of  confidentiality  to the Third Party,  by a Third Party who had no
obligation  to the  Disclosing  Party or any Third  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.

         10.2  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   patent   applications   under  this
Agreement;

              (b) regulatory filings;

              (c) prosecuting or defending litigation;

              (d) complying with applicable governmental regulations;

              (e) conducting preclinical 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 10.

         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 10.2 it will, except where

                                       27

<PAGE>

impracticable,  give  reasonable  advance  notice  to the  other  Party  of such
disclosure  and use  best  efforts  to  secure  confidential  treatment  of such
information.  In any event,  the Parties agree to take all reasonable  action to
avoid disclosure of Confidential Information hereunder. The Parties will consult
with each other and agree on the  provisions of this Agreement to be redacted in
any filings made by the Parties with the Securities  and Exchange  Commission or
as otherwise required by law.

         10.3 PUBLICATIONS. Each Party recognizes that the publication of papers
regarding results of the research and development activities performed under the
Collaboration,  including oral presentations and abstracts, may be beneficial to
both Parties provided such  publications  are subject to reasonable  controls to
protect  Confidential  Information.  In  particular,  it  is the  intent  of the
Parties to maintain the confidentiality of any Confidential Information included
in any foreign patent application until such foreign patent application has been
published.  Accordingly,  each Party  shall have the right to review and approve
any  paper  proposed  for  publication  by  the  other  Party,   including  oral
presentations   and   abstracts,   which   utilizes  data   generated  from  the
Collaboration  and/or  includes  Confidential  Information  of the other  Party.
Before  any  such  paper is  submitted  for  publication,  the  Party  proposing
publication shall deliver a complete copy to the other Party at least forty-five
(45) days prior to  submitting  the paper to a publisher.  The  receiving  Party
shall review any such paper and give its comments to the publishing Party within
thirty (30) days of the  delivery  of such paper to the  receiving  Party.  With
respect to oral  presentation  materials  and  abstracts, the Parties shall make
reasonable efforts to expedite review of such materials and abstracts, and shall
return  such  items  as  soon  as  practicable  to  the  publishing  Party  with
appropriate  comments,  if any, but in no event later than 30 days from the date
of delivery to the receiving  Party.  The publishing Party shall comply with the
other Party's  request to delete  references to such other Party's  Confidential
Information in any such paper and agrees to withhold  publication of same for an
additional  one hundred eighty (180) days to permit the Parties to obtain patent
protection,  if either of the Parties deem it necessary,  in accordance with the
terms of this  Agreement,  provided  however  that  the  structure  of  Research
Compounds may in any case only be disclosed  with the written  agreement of both
Parties.

         10.4  PUBLICITY.  It is understood  that the Parties  intend to issue a
joint press release  announcing  the execution of this  Agreement and agree that
each Party may desire or be required to issue subsequent press releases relating
to the  Agreement or  activities  thereunder.  The Parties agree to consult with
each other  reasonably  and in good faith with respect to the text and timing of
such press releases prior to the issuance thereof, provided that a Party may not
unreasonably withhold consent to such releases,  and that either Party may issue
such press releases as it determines, based on advice of counsel, are reasonably
necessary  to  comply  with  laws  or  regulations  or  for  appropriate  market
disclosure.  In addition,  following the initial joint press release  announcing
this  Agreement,  either  Party  shall be free to  disclose,  without  the other
Party's prior written consent, the existence of this Agreement,  the identity of
the  other  Party and those  terms of the  Agreement  which  have  already  been
publicly disclosed in accordance herewith.

                                       28

<PAGE>

11.      REPRESENTATIONS AND WARRANTIES

         11.1 REPRESENTATIONS AND WARRANTIES. Each Party represents and warrants
to the other 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,  and any person
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  by it 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.  It has not,  and will not during the term of
this Agreement, grant any right to any Third Party which would conflict with the
rights granted to the other Party hereunder.

              (e)  EMPLOYEE  OBLIGATIONS.  All of its  employees,  officers  and
consultants  participating  in the Research  Program  have  executed  agreements
requiring  assignment to such Party of all inventions  made during the course of
and as a result  of  their  association  with  such  Party  and  obligating  the
individual  to maintain as  confidential  the  confidential  information  of the
Party, as well as the confidential information of a Third Party which such Party
may receive.

         11.2 CELGENE REPRESENTATION. Celgene represents that to the best of its
knowledge as of the Effective  Date,  the Celgene  Patent Rights do not infringe
any Third Party patents.

         11.3  DISCLAIMER OF  WARRANTIES.  EXCEPT AS EXPRESSLY SET FORTH IN THIS
AGREEMENT, NEITHER PARTY MAKES ANY REPRESENTATION OR WARRANTY TO THE OTHER PARTY
OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING,  WITHOUT LIMITATION, ANY WARRANTY OF
NON-INFRINGEMENT,  MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.  Without
limiting the generality of the foregoing,  each Party expressly does not warrant
(a) the success of any research  commenced under the Research Program or (b) the
safety or usefulness for any purpose of the technology it provides hereunder.

         11.4  LIMITATION  OF  LIABILITY.  NEITHER  PARTY  SHALL BE  ENTITLED TO
RECOVER FROM THE OTHER PARTY ANY SPECIAL, INCIDENTAL,  CONSEQUENTIAL OR PUNITIVE
DAMAGES IN CONNECTION WITH THIS AGREEMENT OR ANY LICENSE GRANTED HEREUNDER.

         11.5  INDEMNIFICATION.

               (a) Novartis hereby  agrees to save,  defend,  indemnify and hold
harmless Celgene and its officers, directors, employees,  consultants and agents
from and against any

                                       29

<PAGE>

and all losses, damages,  liabilities,  expenses and costs, including reasonable
legal  expense  and  attorneys'  fees  ("LOSSES"),  to which  Celgene may become
subject  as a result of any claim,  demand,  action or other  proceeding  by any
Third Party to the extent such Losses arise  directly or  indirectly  out of (a)
the  practice  by  Novartis  of  any  license  granted  hereunder,  or  (b)  the
development,  manufacture,  use, handling, storage, sale or other disposition of
any Product by Novartis,  its Affiliates or  sublicensees,  except to the extent
such Losses result from the gross negligence or willful misconduct of Celgene.

              (b) Celgene  hereby  agrees to save,  defend,  indemnify and  hold
harmless Novartis and its officers, directors, employees, consultants and agents
from and against any and all  Losses  to which  Novartis may become subject as a
result of any claim,  demand,  action or other  proceeding by any Third Party to
the extent such Losses arise  directly or indirectly  out of (a) the practice by
Celgene of any license granted hereunder,  or (b) the development,  manufacture,
use, handling, storage, sale or other disposition of any product by Celgene, its
Affiliates  or  sublicensees,  except to the extent such Losses  result from the
gross negligence or willful misconduct of Novartis.

              (c) In the event a Party seeks  indemnification under this Section
11.5, it shall inform the other Party (the  "INDEMNIFYING  PARTY") of a claim as
soon as  reasonably  practicable  after it receives  notice of the claim,  shall
permit the Indemnifying  Party to assume direction and control of the defense of
the  claim  (including  the  right to  settle  the  claim  solely  for  monetary
consideration),  and  shall  cooperate  as  requested  (at  the  expense  of the
Indemnifying Party) in the defense of the claim.

12.      TERM AND TERMINATION

         12.1 TERM.  This Agreement  shall commence as of the Effective Date and
shall continue until the last day of the Royalty Term, unless terminated earlier
as provided herein.

         12.2 TERMINATION BY NOVARTIS.

              (a) During the  Research  Term,  Novartis  may at any time without
cause terminate this Agreement by giving ninety (90) days prior notice.

              (b) After the Research  Term and up to the  submission  of an NDA,
Novartis may terminate this Agreement regarding any Compound/Field/Country or in
its  entirety at any time  without  cause with  ninety  (90) days prior  written
notice.

              (c)  Following  NDA   submission,   Novartis  may  terminate  this
Agreement  at any time  partially  or in its  entirety  without  cause  with one
hundred eighty (180) days prior written notice.

              (d)  In  addition  Novartis  may  terminate  this  Agreement  on a
Product-by-Product and  country-by-country  basis or in its entirety with ninety
(90)  days  prior  written  notice  in the  event  that the  Product  cannot  be
reasonably commercialized in such country or the major part of the Territory, as
the case may be. For the  purpose of this  Section  12.2(d),  it will  be deemed
that the Product cannot be reasonably commercialized in case of, but not limited
to one of the following events:  safety issues,  lack of efficacy,  unacceptable
pharmaceutical properties, issues on Regulatory Approvals, infringement of Third
Party intellectual property rights.

                                       30

<PAGE>

                  (E) Celgene will provide  written notice to Novartis of any of
the following proposed events: (i) a merger,  reorganization or consolidation of
Celgene  which  results  in  the  voting   securities  of  Celgene   outstanding
immediately  prior to such transaction  ceasing to represent at least 50% of the
combined  voting  power  of  the  surviving   entity   immediately   after  such
transaction;  or (ii) any Third Party (other than any trustee or other fiduciary
holding securities under an employee benefit plan of Celgene, or any corporation
or other entity owned directly or indirectly by the  stockholders  of Celgene in
substantially  the same  proportion  as their  ownership  of stock of  Celgene),
together with its affiliates,  becoming the beneficial owner of more than 50% of
the combined  voting power of the  outstanding  securities of Celgene.  Novartis
may, at any time during the  forty-five  (45) day period  after the date of such
notice from Celgene, terminate this Agreement with immediate effect upon written
notice to Celgene.

         12.3     TERMINATION  FOR  CAUSE.   Either  Party  may  terminate  this
Agreement  prior  to  the  expiration  of  the  term  of this Agreement upon the
occurrence of any of the following:

                  (A)      Upon or after the bankruptcy, insolvency, dissolution
or winding up of the  other  Party (other than dissolution or winding up for the
purposes of reconstruction or amalgamation); or

                  (B) Upon or after the breach of any material provision of this
Agreement  by the other  Party if the  breaching  Party has not cured such beach
within sixty (60) days after written notice thereof by the non-breaching Party.

         12.4     EFFECT OF EXPIRATION OR TERMINATION

                  (A) Upon termination of this Agreement by Novartis pursuant to
Section 12.2 (with respect to that portion of the Agreement  that is terminated)
or by Celgene pursuant to Section 12.3 (i) all rights under the licenses granted
by Celgene to Novartis  hereunder  shall  automatically  terminate and revert to
Celgene,  (ii) any  sublicenses  granted  hereunder by Novartis  shall remain in
effect,  but shall be  assigned  to Celgene  and (iii) the  licenses  granted by
Novartis to Celgene hereunder shall survive in accordance with their terms.

                  (B) Upon termination of this Agreement by Novartis pursuant to
Section 12.3,  (i) all rights under the licenses  granted by Novartis to Celgene
hereunder  shall  automatically  terminate  and  revert  to  Novartis,  (ii) any
sublicenses  granted  hereunder by Celgene shall remain in effect,  but shall be
assigned to Novartis and (iii) the license  granted under  Section  6.2(a) shall
remain  in  effect,  subject  to  compliance  by  Novartis  with all  applicable
provisions  of  this  Agreement  (including,  without  limitation,  the  payment
obligations set forth in Article 7).

                  (C)  Notwithstanding  any other provision of this Agreement to
the contrary,  in the event that Novartis terminates this Agreement with respect
to any  Compound/Field/Country  or in its entirety  pursuant to Section 12.2(a),
(b), (c) or (d),  Novartis shall remain obligated to make payments to Celgene in
accordance  with  Sections  7.3,  7.4 and 7.5 and Article 8 hereof to the extent
that Novartis continues to develop and/or  commercialize any product included in
the definition of "Product" hereunder.

                  (D)  Expiration or  termination  of this  agreement  shall not
relieve the  Parties of any  obligation  accruing  prior to such  expiration  or
termination.  Except as set forth  below or  elsewhere  in this  Agreement,  the
obligations and rights of the Parties under Sections 8.6, 9.1, 11.3,  11.4, 11.5
and 12.4  (including the provisions  therein that are  contemplated  to continue
following  termination) and Article 8, 10, 13 and 14 shall survive expiration or
termination of this Agreement.
                                       31.
<PAGE>

                  (E)  Within  thirty  (30) days  following  the  expiration  or
termination of this  Agreement,  except to the extent and for so long as a Party
retains  license rights under Sections  12.4(a) or (b), each Party shall deliver
to the other Party any and all  Confidential  Information  of the other Party in
its possession.

                  (F) Upon expiration of this  Agreement,  Novartis shall have a
perpetual, fully paid-up, royalty-free license to Product(s).

13.      DISPUTE RESOLUTION

         13.1  DISPUTES.  The  Parties  recognize  that  disputes  as to certain
matters may from time to time arise which relate to either Party's rights and/or
obligations  hereunder.  It  is  the  objective  of  the  Parties  to  establish
procedures to facilitate the resolution of such disputes in an expedient  manner
by mutual  cooperation  and without  resort to  litigation.  To accomplish  this
objective,  the Parties agree to follow the procedures set forth in section 13.2
if and when such a dispute arises between the Parties.

         13.2 PROCEDURES.  If any dispute arises between the Parties relating to
the  interpretation,  breach or performance of this Agreement or the grounds for
the  termination  thereof,  and the Parties  cannot  resolve the dispute  within
thirty (30) days of a written  request by either Party to the other  Party,  the
Parties  agree to hold a meeting,  attended  by the Chief  Executive  Officer of
Celgene and the CEO of Novartis or their assignees,  to attempt in good faith to
negotiate  a  resolution  of the  dispute  prior  to  pursuing  other  available
remedies.  If,  within sixty (60) days after such written  request,  the Parties
have not  succeeded in  negotiating  a resolution  of the dispute,  such dispute
shall be  submitted  to final and  binding  arbitration  under the then  current
commercial rules and regulations of the American Arbitration association ("AAA")
relating to voluntary arbitrations. The arbitration proceedings shall be held in
New York, New York. The arbitration shall be conducted by one arbitrator, who is
knowledgeable  in the  subject  matter at issue in the  dispute and who shall be
selected by mutual agreement of the Parties or, failing such agreement, shall be
selected in accordance  with the AAA rules.  Each Party shall initially bear its
own costs and legal fees associated with such arbitration.  The prevailing Party
in any such  arbitration  shall be entitled to recover  from the other Party the
reasonable  attorneys' fees, cost and expenses incurred by such prevailing Party
in connection  with such  arbitration.  The decision of the arbitrator  shall be
final and binding on the Parties.  The  arbitrator  shall prepare and deliver to
the Parties a written, reasoned opinion conferring its decision. Judgment on the
award so  rendered  may be entered in any court  having  competent  jurisdiction
thereof.

14.      MISCELLANEOUS

         14.1 ASSIGNMENT.  Except as expressly provided hereunder,  neither this
Agreement nor any rights or  obligations  hereunder may be assigned or otherwise
transferred by either Party without the prior written consent of the other Party
(which consent shall not be  unreasonably  withheld);  provided,  however,  that
either Party may assign this Agreement and its rights and obligations  hereunder
without the other Party's consent (a) in connection with the transfer or sale of
all or  substantially  all of the business of such Party to which this Agreement
relates to another Party,  whether by merger,  sale of stock,  sale of assets or
otherwise, or (b) to any Affiliate.  In the event of such transaction,  however,
intellectual  property rights of a party to such  transaction  other than one of
the Parties to this Agreement (the "ACQUIRING PARTY"),  shall not be included in
the technology  licensed  hereunder.  Notwithstanding  the  foregoing,  any such
assignment  to an  Affiliate  shall  not  relieve  the  assigning  Party  of its
responsibilities  for performance of its obligations  under this Agreement.  The
rights and obligations of the Parties under this Agreement shall be binding upon
and inure to the benefit of the successors and permitted assigns of the Parties.
Any assignment not in accordance with this Agreement shall be void. 32.
<PAGE>

         14.2 FORCE  MAJEURE.  Neither Party shall he held liable or responsible
to the  other  Party  nor be deemed to have  defaulted  under or  breached  this
Agreement  for failure or delay in  fulfilling  or  performing  any term of this
Agreement  (other than  non-payment)  when such failure or delay is caused by or
results  from  causes  beyond  the  reasonable  control of the  affected  Party,
including,  but not  limited  to,  fire,  floods,  embargoes,  war,  acts of war
(whether  war be  declared  or not),  insurrections,  riots,  civil  commotions,
strikes, lockouts or other labor disturbances, acts of God or acts, omissions or
delays in acting by any governmental authority or the other Party.

         14.3  SEVERABILITY.  In case any provision of this  Agreement  shall be
invalid, illegal or unenforceable,  the validity, legality and enforceability of
the remaining provisions shall not in any way be affected or impaired thereby.

         14.4  NOTICES.  All  notices  and  other  communications  provided  for
hereunder shall be in writing and shall be mailed by first-class,  registered or
certified mail,  postage paid, or delivered  personally,  by overnight  delivery
service or by facsimile, with confirmation of receipt, addressed as follows:

         If to Novartis, addressed to:

                           Novartis Pharma AG
                           P.O. Box
                           CH-4002 Basel-Switzerland
                           Attn.:  General Counsel
                           Fax:  +41-61-6859

         If to Celgene, addressed to:

                           Celgene Corporation
                           7 Powder Horn Drive
                           Warren, New Jersey 07059, USA
                           Attn.:  Chief Executive Officer
                           Fax:  (732) 805 3931

Either  Party may by like notice  specify or change an address to which  notices
and communications  shall thereafter be sent. Notices sent by facsimile shall be
effective  upon  confirmation  of  receipt,  notices  sent by mail or  overnight
delivery  service shall be effective upon receipt,  and notices given personally
shall be effective when delivered.

         14.5     GOVERNING LAW.   This  Agreement  shall  be  governed  by, and
construed and enforced in accordance  with,  the  laws  of the State of New York
without regard to conflicts-of-laws principles.

         14.6 INDEPENDENT  CONTRACTORS.  It is expressly agreed that Celgene and
Novartis shall be independent  contractors and that the relationship between the
two Parties shall not  constitute a partnership  or agency of any kind.  Neither
Celgene  nor  Novartis  shall  have  the  authority  to  make  any   statements,
representations  or commitments of any kind, or to take any action,  which shall
be binding on the other Party,  without the prior  written  consent of the other
Party.

         14.7     ENTIRE AGREEMENT; AMENDMENT.   This  Agreement  (including the
exhibits attached hereto) sets forth all of the covenants, promises, agreements,
warranties, representations, conditions and

                                       33.
<PAGE>

understandings  between the Parties  hereto with  respect to the subject  matter
hereof and supersedes and  terminates  all prior  agreements and  understandings
between the Parties. There are no covenants, promises,  agreements,  warranties,
representations  conditions or understandings,  either oral or written,  between
the Parties other than as set forth herein. No subsequent alteration, amendment,
change or addition to this  Agreement  shall be binding upon the Parties  hereto
unless  reduced to writing and signed by the respective  authorized  officers of
the Parties.

         14.8 HEADINGS. The captions to the several Articles and Sections hereof
are not a part of this  Agreement,  but are merely guides or labels to assist in
locating and reading the several Articles and Sections hereof.

         14.9 WAIVER.  Except as  specifically  provided for herein,  the waiver
from  time to time by  either  of the  Parties  of any of their  rights or their
failure to exercise any remedy shall not operate or be construed as a continuing
waive of same or of any other of such  Party's  rights or  remedies  provided in
this Agreement.

         14.10  COUNTERPARTS.   This  Agreement  may  be  executed  in  multiple
counterparts  (which may be  delivered  by  facsimile),  each of which  shall be
deemed an original,  but all of which together shall constitute one and the same
instrument.






























                                       34.
<PAGE>

         IN WITNESS WHEREOF,  the Parties have executed this Agreement as of the
date first set forth above.


CELGENE CORPORATION                                NOVARTIS PHARMA AG

By:      /s/ Sol J. Barer                          By:      /s/ V. Hartmann
         ---------------------------------                  ---------------

Name:    Sol J. Barer                              Name:    V. Hartmann
         ---------------------------------                  -----------
Title:   President/Chief Operating Officer         Title:   Head BDIL
         ---------------------------------                  ---------



EXHIBITS

A        Active Compound Criteria
B        Research Plan


































                                       35.