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

                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549

                                  -----------

                                  SCHEDULE TO

                 Tender Offer Statement Under Section 14(d)(1)
          or Section 13(e)(1) of the Securities Exchange Act of 1934
                               (Amendment No. 2)
                                  -----------

                         ImClone Systems Incorporated
                      (Name of Subject Company (Issuer))

                         Bristol-Myers Squibb Company
                    Bristol-Myers Squibb Biologics Company
                     (Names of Filing Persons (Offerors))

                                  -----------

                    Common Stock, Par Value $.001 per Share
                        (Title of Class of Securities)

                                  -----------

                                   45245W109
                     (CUSIP Number of Class of Securities)

                                  -----------

                         Bristol-Myers Squibb Company
                                345 Park Avenue
                           New York, New York 10154
                           Telephone: (212) 546-4000
                        Attention: Corporate Secretary

                 (Name, address and telephone number of person
              authorized to receive notices and communications on
                           behalf of filing persons)

                                  Copies to:
                              Susan Webster, Esq.
                            Cravath, Swaine & Moore
                               825 Eighth Avenue
                         New York, New York 10019-7475
                           Telephone: (212) 474-1000

                                  -----------


[ ] Check the box if the filing relates to preliminary communications made
before the commencement of a tender offer.

     Check the appropriate boxes below to designate any transactions to which
the statement relates:

[X] third-party tender offer subject to Rule 14d-1.
[ ] issuer tender offer subject to Rule 13e-4.
[ ] going-private transaction subject to Rule 13e-3.
[ ] amendment to Schedule 13D under Rule 13d-2.

Check the following box if the filing is a final amendment reporting the
results of the tender offer: [ ]

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





                                                                             2

     This Amendment No. 2 amends the Tender Offer Statement on Schedule TO
initially filed on September 28, 2001, as amended by Amendment No. 1 filed on
October 12, 2001 (the "Schedule TO"), by Bristol-Myers Squibb Biologics
Company, a Delaware corporation (the "Purchaser") and a wholly owned
subsidiary of Bristol-Myers Squibb Company, a Delaware corporation ("Parent"),
to purchase up to 14,392,003 of the outstanding shares of common stock, par
value $.001 per share (the "Shares"), of ImClone Systems Incorporated, a
Delaware corporation (the "Company"), at a purchase price of $70.00 per Share,
net to the seller in cash, without interest thereon, upon the terms and
subject to the conditions set forth in the Offer to Purchase dated September 28,
2001.

ITEM 12.  EXHIBITS

*(d)(3)   Development, Promotion, Distribution and Supply Agreement dated as
          of September 19, 2001 among Parent, E.R. Squibb & Sons, L.L.C. and
          the Company. (to replace Exhibit (d)(3) to the Schedule TO filed
          with the Securities and Exchange Commission ("Commission") on
          September 28, 2001)

*    This revised agreement shall be deemed to replace, in all references in
     the Schedule TO, the Development, Promotion, Distribution and Supply
     Agreement dated as of September 19, 2001, which was previously filed as
     Exhibit (d)(3) to the Schedule TO. Certain provisions of this agreement
     have been omitted pursuant to an application for confidential treatment
     filed with the Commission by Parent, the Purchaser and the Company
     pursuant to Rule 24b-2 under the Securities Exchange Act of 1934.





                                                                             3

                                  SIGNATURES

     After due inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and
correct.

                                       Bristol-Myers Squibb Biologics Company

                                       By: /s/ Sandra Leung
                                           -----------------------------------
                                           Name:  Sandra Leung
                                           Title: Vice President and Secretary


                                       Bristol-Myers Squibb Company

                                       By: /s/ Frederick S. Schiff
                                           -----------------------------------
                                           Name:  Frederick S. Schiff
                                           Title: Senior Vice President and
                                                  Chief Financial Officer

Dated: October 26, 2001





                                                                             4

                               INDEX TO EXHIBITS

* *(a)(1)(A)   Offer to Purchase dated September 28, 2001.

**(a)(1)(B)    Recommendation Statement on Schedule 14D-9 of the Company dated
               September 28, 2001 (incorporated by reference to Schedule 14D-9
               filed with the Commission by the Company on September 28,
               2001).
 **(a)(1)(C)   Letter of Transmittal.
 **(a)(1)(D)   Notice of Guaranteed Delivery.

 **(a)(1)(E)   Letter to Brokers, Dealers, Banks, Trust Companies and Other
               Nominees.

 **(a)(1)(F)   Letter to Clients for use by Brokers, Dealers, Banks, Trust
               Companies and Other Nominees.

 **(a)(1)(G)   Guidelines for Certification of Taxpayer Identification Number
               on Substitute Form W-9.

 **(a)(1)(H)   Press Release issued by Parent on September 19, 2001.

 **(a)(1)(I)   Summary Advertisement published September 28, 2001.

**(a)(1)(J)    Letter to Stockholders of the Company from the President and
               Chief Executive Officer of the Company dated September 28,
               2001.

**(a)(1)(K)    Form of Notice of Conditional Exercise.

**(a)(1)(L)    Instructions for Conditional Exercise.

**(a)(1)(M)    Memorandum to Eligible Option Holders.

**(a)(5)(A)    Advertisement as published in the Wall Street Journal on
               October 11, 2001.

(b)            Not applicable.

**(d)(1)       Acquisition Agreement dated as of September 19, 2001, among
               Parent, the Purchaser and the Company.

*(d)(2)        Stockholder Agreement
               dated as of September 19, 2001, among Parent, the Purchaser and
               the Company.

**(d)(3)       Development, Promotion, Distribution and Supply Agreement dated
               as of September 19, 2001 among Parent, E.R. Squibb & Sons,
               L.L.C. and the Company.

**(d)(4)       Confidentiality Agreement dated May 19, 2001 between Parent and
               the Company.

**(d)(5)       Letter Agreement dated September 19, 2001 between Parent and
               Dr. Harlan Waksal.

**(d)(6)       Letter Agreement dated September 19, 2001 between Parent and
               Samuel Waksal, Ph.D.

(g)            Not applicable.

(h)            Not applicable.


*     Filed herewith; certain portions of this agreement have been omitted
      pursuant to an application for confidential treatment filed with the
      Commission by Parent, the Purchaser and the Company pursuant to Rule
      24b-2, under the Exchange Act.

**    Previously filed.







[NOTE:  CERTAIN  PORTIONS OF THIS  DOCUMENT  HAVE BEEN MARKED TO INDICATE THAT
CONFIDENTIAL  TREATMENT HAS BEEN REQUESTED FOR SUCH PORTIONS BY  BRISTOL-MYERS
SQUIBB COMPANY,  BRISTOL-MYERS  SQUIBB  BIOLOGICS  COMPANY AND IMCLONE SYSTEMS
INCORPORATED.  THESE PORTIONS HAVE BEEN MARKED WITH TWO ASTERISKS  ENCLOSED IN
BRACKETS (i.e.,  [**]). THE CONFIDENTIAL  PORTIONS HAVE BEEN OMITTED AND FILED
SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.]

                            DEVELOPMENT, PROMOTION,

                       DISTRIBUTION AND SUPPLY AGREEMENT

                                     AMONG

                           E. R. SQUIBB & SONS, LLC,


                         BRISTOL-MYERS SQUIBB COMPANY,

                                      AND

                         IMCLONE SYSTEMS INCORPORATED

                                  DATED AS OF

                              September 19, 2001





Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.

                               TABLE OF CONTENTS
                               -----------------

                                                                          Page
                                                                          ----

1.   DEFINITIONS.............................................................2

     1.1      Accelerated Arbitration Provisions.............................2
     1.2      Acquiring Party................................................2
     1.3      Acquisition Agreement..........................................2
     1.4      Acquisition Subsidiary.........................................2
     1.5      Affiliate......................................................2
     1.6      Alliance Manager...............................................2
     1.7      Allocable Overhead.............................................2
     1.8      Allowable Failure Rate.........................................2
     1.9      Antitrust Injunction...........................................2
     1.10     API............................................................2
     1.11     Audited Party..................................................2
     1.12     Auditing Party.................................................2
     1.13     Base Case Projections..........................................3
     1.14     BLA Filing Date................................................3
     1.15     BMS............................................................3
     1.16     BMS Dilution Event.............................................3
     1.17     BMS Sell-Down..................................................3
     1.18     Breaching Party................................................3
     1.19     Clinical Budget................................................3
     1.20     Clinical Development Plan......................................3
     1.21     Committee......................................................3
     1.22     Common Stock...................................................3
     1.23     Company........................................................3
     1.24     Company SEC Documents..........................................3
     1.25     cGMP...........................................................3
     1.26     Competing Product..............................................3
     1.27     Compound.......................................................3
     1.28     Confidential Information.......................................3
     1.29     Co-Promotion Option............................................4
     1.30     Co-Promotion Problem...........................................4
     1.31     Cost of Goods Sold.............................................4
     1.32     Critical Issue.................................................4
     1.33     Current Forecast...............................................4
     1.34     Development Costs..............................................4
     1.35     Distribution Costs.............................................4
     1.36     Distribution Fee...............................................4
     1.37     Effective Date.................................................4
     1.38     Equity Agreements..............................................4
     1.39     ERS............................................................4


                                     -i-





Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.

     1.40     ERS Inventions.................................................4
     1.41     ERS Obligations................................................4
     1.42     ERS Proposed Terms.............................................4
     1.43     FDA............................................................4
     1.44     Field..........................................................4
     1.45     Finance Committee..............................................4
     1.46     Financial Appendix.............................................5
     1.47     Finished Product..............................................5
     1.48     First Commercial Sale..........................................5
     1.49     First Offer Termination Date...................................5
     1.50     Fully Burdened Manufacturing Cost..............................5
     1.51     GAAP...........................................................5
     1.52     General and Administrative Costs...............................5
     1.53     Gross Profit...................................................5
     1.54     Inability to Supply............................................5
     1.55     IND............................................................5
     1.56     Indemnitee.....................................................5
     1.57     infringement...................................................5
     1.58     Indicative Marketing Budget....................................5
     1.59     Initial Regulatory Filing......................................5
     1.60     Invention......................................................5
     1.61     Joint Commercialization Committee or JCC.......................6
     1.62     Joint Executive Committee or JEC...............................6
     1.63     Joint Manufacturing Committee or JMC...........................6
     1.64     Know-How.......................................................6
     1.65     knowledge of the Company.......................................6
     1.66     Letter of Intent...............................................6
     1.67     Long-Term Inability to Supply..................................6
     1.68     Low Case Projections...........................................6
     1.69     Manufacturing Standards........................................6
     1.70     Marketing Budget...............................................6
     1.71     Marketing Costs................................................6
     1.72     Marketing Plans................................................6
     1.73     Merck Agreement................................................7
     1.74     Merck Entities.................................................7
     1.75     Net Sales......................................................7
     1.76     Non-Acquiring Party............................................7
     1.77     Non-Breaching Party............................................7
     1.78     Non-Registrational Studies.....................................7
     1.79     North America..................................................7
     1.80     Number of Days to Make Payment.................................7
     1.81     Offer..........................................................7
     1.82     Operating Profit or Loss.......................................7
     1.83     Other Compound.................................................7
     1.84     Other Operating Income/Expense.................................7


                                     -ii-





Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.

     1.85     Partnering Relationships.......................................7
     1.86     Party..........................................................7
     1.87     Patents........................................................7
     1.88     Person.........................................................8
     1.89     Product........................................................8
     1.90     Product Development Committee or PDC...........................8
     1.91     Proposed Terms.................................................8
     1.92     Q1, Q2, Q3 and Q4..............................................8
     1.93     Registration...................................................8
     1.94     Registration Application.......................................8
     1.95     Registrational Studies.........................................8
     1.96     Regulatory Authority...........................................8
     1.97     Restricted Period..............................................8
     1.98     Sales Costs....................................................8
     1.99     Sales Force Guidelines.........................................8
     1.100    Shares.........................................................8
     1.101    Short-Term Inability to Supply.................................9
     1.102    Specifications.................................................9
     1.103    Stockholder Agreement..........................................9
     1.104    Subsidiary.....................................................9
     1.105    Summary Clinical Development Plan..............................9
     1.106    Technology.....................................................9
     1.107    Termination Date...............................................9
     1.108    Territory......................................................9
     1.109    Testing Methods................................................9
     1.110    Third Party....................................................9
     1.111    Third Party Change of Control Transaction......................9
     1.112    Third Party Manufacturer.......................................9
     1.113    Trademarks.....................................................9
     1.114    United States or U.S...........................................9
     1.115    Valid Claim....................................................9
2.   MANAGEMENT.............................................................10
     2.1      Joint Executive Committee.....................................10
     2.2      Finance Committee.............................................12
     2.3      Product Development Committee.................................13
     2.4      Joint Commercialization Committee.............................14
     2.5      Joint Manufacturing Committee.................................16
     2.6      Minutes of Committee Meetings.................................17
     2.7      Term..........................................................18
     2.8      Expenses......................................................18
     2.9      Alliance Managers.............................................18
3.   GRANT OF RIGHTS........................................................19
     3.1      Rights Granted to ERS.........................................19
     3.2      Restrictions on the Company...................................19
     3.3      License to ERS Inventions.....................................19


                                     -iii-





Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.

     3.4      Trademarks; Logos.............................................19
     3.5      Right of First Offer to ERS Regarding the Other Compound......20
     3.6      Right of First Negotiation of ERS Regarding Partnering
              Transactions..................................................21
     3.7      Negotiation of Services.......................................21
     3.8      Restrictions on Competing Products............................21
     3.9      The Company's Right to Develop and Market Products............22
4.   DEVELOPMENT AND REGULATORY MATTERS.....................................23
     4.1      Exchange of Data and Know-How.................................23
     4.2      Product Registrations.........................................24
     4.3      Scope of Clinical Development Plans and Clinical Budget.......24
     4.4      Transition of Clinical Studies................................26
     4.5      Conduct of Clinical Development Plans.........................26
     4.6      Funding of Clinical Development Plans.........................27
     4.7      IT Support....................................................28
     4.8      Delay of Initial Regulatory Filing............................28
     4.9      Suspension of Clinical Development Activities.................29
     4.10     Liability.....................................................29
5.   DISTRIBUTION AND PROMOTION.............................................29
     5.1      Generally.....................................................29
     5.2      Scope of Marketing Budget.....................................29
     5.3      ERS Responsibilities; Rights..................................30
     5.4      Marketing Plans...............................................30
     5.5      Promotional Materials and Activities..........................30
     5.6      The Company's Co-Promotion Right..............................31
     5.7      Distribution and Marketing Costs..............................32
6.   PAYMENTS...............................................................32
     6.1      Upfront Payments to the Company...............................32
     6.2      Milestone Payments to the Company.............................33
     6.3      Distribution Fees for North America...........................33
     6.4      Reduction in Distribution Fee for North America...............34
     6.5      Distribution Fees for Japan...................................34
     6.6      Allocation of Sales...........................................34
7.   PAYMENTS AND REPORTS...................................................34
     7.1      Payments......................................................34
     7.2      Reports.......................................................34
     7.3      Mode of Payment...............................................35
     7.4      Records Retention.............................................35
     7.5      Audit Request.................................................35
     7.6      Cost of Audit.................................................35
     7.7      No Non-Monetary Consideration for Sales.......................36
     7.8      Taxes.........................................................36
8.    MANUFACTURE AND SUPPLY................................................36
     8.1      Supply Obligations............................................36
     8.2      Supply of API; Processing of Finished Product.................37
     8.3      Forecasts.....................................................37


                                     -iv-





Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.

     8.4      Orders for API................................................37
     8.5      Delivery......................................................38
     8.6      Purchase Price................................................39
     8.7      Conformity; Specifications; Quality Control...................39
     8.8      Acceptance/Rejection; Interim Replacement.....................40
     8.9      Third Party Manufacturers.....................................42
     8.10     Inventory Management..........................................43
     8.11     Shortage of Supply............................................43
     8.12     Inability to Supply...........................................43
9.   OWNERSHIP; PATENTS; TRADEMARKS.........................................45
     9.1      Ownership.....................................................45
     9.2      Maintenance of the Patents....................................45
     9.3      Patent Enforcement............................................46
     9.4      Infringement Action by Third Parties..........................47
10.  PUBLICATION; CONFIDENTIALITY...........................................48
     10.1     Notification..................................................48
     10.2     Review........................................................49
     10.3     Confidentiality; Exceptions...................................49
     10.4     Exceptions to Obligation......................................49
     10.5     Limitations on Use............................................50
     10.6     Remedies......................................................50
11.  REPRESENTATIONS AND WARRANTIES.........................................50
     11.1     Representations and Warranties of the Parties.................50
     11.2     Representations and Warranties of the Company.................51
     11.3     Representations and Warranties of ERS and BMS.................51
     11.4     Representations and  Warranties of BMS........................52
12.  RECALL; INDEMNIFICATION................................................52
     12.1     Investigation; Recall.........................................52
     12.2     Indemnification by ERS and BMS................................52
     12.3     Indemnification by the Company................................52
     12.4     Notice of Indemnification.....................................53
     12.5     Complete Indemnification......................................53
13.  TERM; TERMINATION......................................................53
     13.1     Term..........................................................53
     13.2     Termination for Cause.........................................53
     13.3     Termination by ERS............................................54
     13.4     Termination by the Company....................................54
     13.5     Termination in Connection With Additional Studies.............54
     13.5     Effect of Expiration or Termination...........................55
     13.6     Accrued Rights; Surviving Obligations.........................55
14.  FORCE MAJEURE..........................................................55
     14.1     Events of Force Majeure.......................................55
15.  ADDITIONAL COVENANTS OF BMS AND BMS GUARANTEE..........................56
     15.1     Additional Covenants of BMS...................................56
     15.2     BMS Guarantee.................................................56


                                     -v-





Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.

16.  MISCELLANEOUS..........................................................56
     16.1     Relationship of Parties.......................................56
     16.2     Assignment....................................................56
     16.3     Books and Records.............................................57
     16.4     Further Actions...............................................57
     16.5     Notice........................................................57
     16.6     Use of Name...................................................58
     16.7     Public Announcements..........................................58
     16.8     Waiver........................................................58
     16.9     Compliance with Law...........................................59
     16.10    Severability..................................................59
     16.11    Amendment.....................................................59
     16.12    Governing Law.................................................59
     16.13    Arbitration...................................................59
     16.14    Entire Agreement..............................................60
     16.15    Parties in Interest...........................................60
     16.16    Descriptive Headings..........................................61
     16.17    Counterparts..................................................61
Exhibit 1.13  BASE CASE PROJECTIONS.........................................63
Exhibit 1.46  FINANCIAL APPENDIX............................................64
Exhibit 1.68  LOW CASE PROJECTIONS..........................................70
Exhibit 1.87  PATENTS.......................................................71
Exhibit 2.1   JOINT EXECUTIVE COMMITTEE AND ALLIANCE MANAGERS...............72
Exhibit 4.3(A)CLINICAL BUDGET...............................................73
Exhibit 4.3(B)SUMMARY CLINICAL DEVELOPMENT PLAN FOR 2001-2004...............74
Exhibit 5.2(A)MARKETING BUDGET FOR 2001-2004................................75
Exhibit 5.2(B)INDICATIVE MARKETING BUDGET FOR 2005-2017.....................76
Exhibit 8.12(B)(i)BASE CASE CLINICAL SUPPLY AMOUNT..........................77
Exhibit 8.12(B)(ii)BASE CASE COMMERCIAL SUPPLY AMOUNT.......................78


                                     -vi-





Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.

                            DEVELOPMENT, PROMOTION,
                       DISTRIBUTION AND SUPPLY AGREEMENT

     THIS  DEVELOPMENT,  PROMOTION,  DISTRIBUTION  AND SUPPLY  AGREEMENT (this
"Agreement"),  dated as of September 19, 2001, is entered into by and among E.
R. SQUIBB & SONS,  LLC, a limited  liability  company  organized  and existing
under the laws of the State of Delaware, having offices located at Route 206 &
Province  Line Road,  Princeton,  New  Jersey  ("ERS"),  BRISTOL-MYERS  SQUIBB
COMPANY,  a corporation  organized and existing under the laws of the State of
Delaware, having offices located at Route 206 & Province Line Road, Princeton,
New Jersey ("BMS") and IMCLONE SYSTEMS  INCORPORATED,  a corporation organized
under the laws of the State of Delaware,  having offices located at 180 Varick
Street, New York, New York 10014 (the "Company").

                            PRELIMINARY STATEMENTS

     A. The  Company  owns,  and/or has  exclusive  rights to, the Patents and
Know-How in existence as of the Effective Date relating to the Compound.


     B. ERS and the  Company  desire to  collaborate  on the  development  and
commercialization of Products using the Compound for application in the Field.


     C. ERS wishes to: (i) obtain the exclusive  right to distribute,  and the
co-exclusive  right to develop and promote  (together  with the Company),  the
Products  in North  America;  (ii) obtain the  co-exclusive  right to develop,
distribute and promote (together with the Company and the Merck Entities), the
Products in Japan; and (iii) use the Company's  registered  trademarks for the
Products in the Territory in connection  with the  foregoing,  and the Company
desires to grant such rights to ERS, on the terms and  conditions set forth in
this Agreement.

     D. ERS also wishes to purchase from the Company,  and the Company  wishes
to supply to ERS,  ERS's  entire  bulk  requirements  of API, on the terms and
conditions set forth in this Agreement.

     E. Simultaneously with the execution of this Agreement,  the Company, BMS
and Bristol-Myers  Squibb Biologics Company, a Delaware corporation and wholly
owned  subsidiary  of BMS  ("Acquisition  Subsidiary"),  are entering  into an
Acquisition Agreement (the "Acquisition Agreement"),  pursuant to which, among
other things, BMS and Acquisition  Subsidiary shall commence a tender offer to
acquire approximately 19.9% of the Company's outstanding Common Stock.

     F. Simultaneously with the execution of this Agreement,  the Company, BMS
and  Acquisition  Subsidiary  are entering into a Stockholder  Agreement  (the
"Stockholder  Agreement",  and together with the  Acquisition  Agreement,  the
"Equity Agreements"),  pursuant to which, among other things, the Company, BMS
and Acquisition  Subsidiary have established  certain governance  arrangements
among the Company, BMS and Acquisition Subsidiary.





Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


     NOW, THEREFORE,  in consideration of the foregoing preliminary statements
and the mutual  agreements and covenants set forth herein,  the Parties hereby
agree as follows:

1. DEFINITIONS.

     As used in this  Agreement,  the following  terms shall have the meanings
set forth in this Section 1 unless context dictates otherwise:

     1.1 "Accelerated  Arbitration Provisions" shall have the meaning assigned
to such term in Section 16.13(b).

     1.2  "Acquiring  Party"  shall have the meaning  assigned to such term in
Section 3.8.

     1.3 "Acquisition  Agreement" shall have the meaning assigned to such term
in the preliminary statements.

     1.4 "Acquisition Subsidiary" shall have the meaning assigned to such term
in the preliminary statements.

     1.5  "Affiliate"  of any  Person  means  any  other  Person  directly  or
indirectly  controlling,  controlled  by or under  common  control  with  such
Person; provided that for purposes of this Agreement,  neither the Company nor
any of its  Subsidiaries  shall be deemed an  Affiliate of ERS or BMS. For the
purposes of this  definition,  "control" when used with respect to any Person,
means the possession,  directly or indirectly, of the power to direct or cause
the direction of the management and policies of such Person,  whether  through
the ownership of voting  securities,  by contract or otherwise;  and the terms
"controlling" and "controlled" have meanings correlative to the foregoing.

     1.6 "Alliance  Manager"  shall have the meaning  assigned to such term in
Section 2.9.

     1.7 "Allocable  Overhead" shall have the meaning assigned to such term in
the Financial Appendix.

     1.8 "Allowable Failure Rate" shall have the meaning assigned to such term
in Section 8.8(c).

     1.9 "Antitrust  Injunction"  shall have the meaning assigned to such term
in the Acquisition Agreement.

     1.10 "API" shall mean any  Compound,  in bulk form,  for use as an active
ingredient in the manufacture of Finished Products.

     1.11  "Audited  Party"  shall have the  meaning  assigned to such term in
Section 7.5.

     1.12  "Auditing  Party"  shall have the meaning  assigned to such term in
Section 7.5.

     1.13  "Base  Case  Projections"  shall  mean  those  base case  financial
projections  for the  Products  for each of calendar  years 2005  through 2017
attached to this Agreement as Exhibit 1.13.

     1.14 "BLA Filing  Date"  shall have the meaning  assigned to such term in
Section 4.1.

     1.15  "BMS"  shall  have  the  meaning  assigned  to  such  term  in  the
introductory paragraph.


                                       2





Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


     1.16 "BMS Dilution Event" shall have the meaning assigned to such term in
the Stockholder Agreement.

     1.17 "BMS Sell-Down"  shall have the meaning assigned to such term in the
Stockholder Agreement.

     1.18  "Breaching  Party" shall have the meaning  assigned to such term in
Section 13.2(a).

     1.19  "Clinical  Budget" shall have the meaning  assigned to such term in
Section 4.3(a).

     1.20  "Clinical  Development  Plan"  shall mean the  definitive  clinical
development  plan  approved by the PDC  pursuant to Section  4.3(b),  and each
subsequent  definitive clinical  development plan approved by the PDC pursuant
to Section 4.3(e).

     1.21 "Committee" shall mean any of the JEC, the PDC, the JCC, the JMC and
the Finance Committee and, when used in the plural,  shall mean all of them or
more than one of them, as the case may be.

     1.22 "Common Stock" shall mean the common stock,  $.001 par value, of the
Company.

     1.23  "Company"  shall  have the  meaning  assigned  to such  term in the
introductory paragraph.

     1.24 "Company SEC Documents" shall have the meaning assigned to such term
in the Acquisition Agreement.

     1.25 "cGMP" shall mean current Good Manufacturing  Practice as defined in
Parts 210 and 211 of Title 21 of the U.S. Code of Federal Regulations,  as may
be amended from time to time, or any successor thereto.

     1.26  "Competing  Product"  shall  mean a  product  which has as its only
mechanism of action an antagonism of the EGF receptor.

     1.27  "Compound"  shall mean the compound  known as  IMC-C225,  including
without  limitation  all fully  humanized or human  version  thereof,  and all
analogs, derivatives and/or improvements of any of the foregoing.

     1.28  "Confidential  Information" shall have the meaning assigned to such
term in Section 10.3.

     1.29  "Co-Promotion  Option" shall have the meaning assigned to such term
in Section 5.6.

     1.30 "Co-Promotion  Problem" shall have the meaning assigned to such term
in Section 5.6(e).

     1.31 "Cost of Goods Sold" shall have the meaning assigned to such term in
the Financial Appendix.

     1.32  "Critical  Issue"  shall  mean any  matter  that is  subject to the
decision-making  authority of any Committee that is material and would cause a
significant  delay or inability to be  responsive  which would have a material
adverse consequence to the clinical  development,  distribution,  promotion or
sale of the Products.

     1.33 "Current  Forecast" shall have the meaning  assigned to such term in
Section 8.4.


                                       3





Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


     1.34 "Development  Costs" shall have the meaning assigned to such term in
the Financial Appendix.

     1.35 "Distribution Costs" shall have the meaning assigned to such term in
the Financial Appendix.

     1.36  "Distribution  Fee"  shall  mean  the fees to be paid by ERS to the
Company  pursuant  to  Sections  6.3 and 6.5 in  consideration  for the rights
granted  to ERS by the  Company  with  respect  to North  America  and  Japan,
respectively.

     1.37 "Effective  Date" shall mean the date set forth in the  introductory
paragraph of the Agreement.

     1.38 "Equity  Agreements" shall have the meaning assigned to such term in
the preliminary statements.

     1.39  "ERS"  shall  have  the  meaning  assigned  to  such  term  in  the
introductory paragraph.

     1.40 "ERS  Inventions"  shall have the  meaning  assigned to such term in
Section 9.1.

     1.41 "ERS  Obligations"  shall have the meaning  assigned to such term in
Section 15.2.

     1.42 "ERS Proposed Terms" shall have the meaning assigned to such term in
Section 3.5(c).

     1.43 "FDA" shall mean the United States Food and Drug Administration,  or
any successor thereto.

     1.44 "Field" shall mean all pharmaceutical applications for human health.

     1.45 "Finance  Committee" shall have the meaning assigned to such term in
Section 2.1(b)(vii).

     1.46  "Financial  Appendix"  shall mean  Exhibit  1.46  attached  to this
Agreement.

     1.47 "Finished  Product" shall mean any  formulation or dosage of Product
in finished form, including, without limitation, any product labeling or other
package   inserts  or  materials   required  by  the   applicable   Regulatory
Authority(ies)  and, when used in the plural,  shall mean all formulations and
dosages  of Product in  finished  form,  including,  without  limitation,  all
product  labeling  and other  package  inserts and  materials  required by the
applicable Regulatory Authority(ies).

     1.48 "First  Commercial Sale" shall mean the first sale of a Product to a
Third Party by ERS or its Affiliates in any country in the Territory after all
Registrations  required to permit such sale have been granted, or such sale is
otherwise permitted, by the Regulatory Authority in such country.

     1.49 "First  Offer  Termination  Date" shall mean the earlier to occur of
(i) the date which is the fifth  anniversary  of the Effective  Date, and (ii)
the date which is the first anniversary of a BMS Dilution Event.

     1.50 "Fully Burdened  Manufacturing Cost" shall have the meaning assigned
to such term in the Financial Appendix.


                                       4





Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


     1.51 "GAAP" shall mean generally  accepted  accounting  principles in the
United States, consistently applied by the Party at issue.

     1.52 "General and  Administrative  Costs" shall have the meaning assigned
to such term in the Financial Appendix.

     1.53 "Gross  Profit" shall have the meaning  assigned to such term in the
Financial Appendix.

     1.54  "Inability to Supply" shall have the meaning  assigned to such term
in Section 8.12(b).

     1.55 "IND" shall mean any filing made with the  Regulatory  Authority  in
any country in the Territory for initiating  clinical  trials in such country,
with respect to a Product.

     1.56 "Indemnitee" shall have the meaning assigned to such term in Section
12.4.

     1.57  "infringement"  shall  have the  meaning  assigned  to such term in
Section 9.3(a).

     1.58 "Indicative  Marketing  Budget" shall mean the indicative  marketing
budget attached as Exhibit 5.2(B).

     1.59 "Initial  Regulatory  Filing" shall mean the completed and submitted
initial Registration Application for the initial Product with the FDA.

     1.60  "Invention"  shall  mean any new or  useful  process,  manufacture,
compound, composition of matter, improvements,  discoveries, claims, formulae,
processes,  trade secrets,  technologies and know-how (including  confidential
data and  Confidential  Information),  to the extent relating to, derived from
and  useful  for  the  manufacture,  use or sale of a  Compound  or a  Product
(including,  without limitation,  the formulation,  delivery or use thereof in
the Field), including, without limitation,  synthesis,  preparation,  recovery
and  purification  processes  and  techniques,  control  methods  and  assays,
chemical data, toxicological and pharmacological data and techniques, clinical
data, medical uses, product forms and product formulations and specifications,
whether  patentable  or  unpatentable,   that  (except  for  purposes  of  the
definitions  of Know-How  and Patents  set forth  herein in Sections  1.64 and
1.87,  respectively) is conceived or first reduced to practice or demonstrated
to have utility during the term of this Agreement.

     1.61 "Joint Commercialization  Committee" or "JCC" shall have the meaning
assigned to such term in Section 2.4(a).

     1.62 "Joint Executive Committee" or "JEC" shall have the meaning assigned
to such term in Section 2.1(a).

     1.63  "Joint  Manufacturing  Committee"  or "JMC"  shall have the meaning
assigned to such term in Section 2.5(a).

     1.64  "Know-How"  shall mean any and all unpatented  Inventions  that are
generated, owned or controlled by the Company at any time before or during the
term of this Agreement to the extent  relating to, derived from and useful for
the manufacture of Finished Products from API,  manufacture of API, or the use
or sale of the  Compounds  or the  Products in the Field in any country in the
Territory.

     1.65  "knowledge  of  the  Company"  shall  mean  the  knowledge,   after
reasonable inquiry, of Samuel Waksal, Ph.D., Harlan Waksal, M.D., Daniel Lynch
or John Landes.


                                       5





Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


     1.66 "Letter of Intent"  shall have the meaning  assigned to such term in
Section 3.5(b).

     1.67 "Long-Term  Inability to Supply" shall have the meaning  assigned to
such term in Section 8.12(d).

     1.68  "Low  Case  Projections"   shall  mean  those  low  case  financial
projections  for the  Products  for each of calendar  years 2005  through 2017
attached to this Agreement as Exhibit 1.68.

     1.69 "Manufacturing Standards" shall mean, with respect to the API or any
Finished  Product,  cGMP and such additional  manufacturing  specifications or
standards  as may be  established  by mutual  agreement of the Company and ERS
from time to time.

     1.70  "Marketing  Budget"  shall  mean the  definitive  marketing  budget
attached as Exhibit 5.2(A) and each  subsequent  marketing  budget approved by
the JCC in accordance with Section 5.2(c).

     1.71  "Marketing  Costs" shall have the meaning  assigned to such term in
the Financial Appendix.

     1.72  "Marketing  Plans" shall have the meaning  assigned to such term in
Section 5.4.

     1.73 "Merck  Agreement"  shall mean that certain  Development and License
Agreement  entered into by the Company and Merck KGaA on December 14, 1998, as
amended and modified as of the date of this Agreement.

     1.74 "Merck Entities" shall mean Merck KGaA and its permitted affiliates,
successors and assigns under the Merck Agreement.

     1.75 "Net  Sales"  shall have the  meaning  assigned  to such term in the
Financial Appendix.

     1.76  "Non-Acquiring  Party" shall have the meaning assigned to such term
in Section 3.8(b).

     1.77  "Non-Breaching  Party" shall have the meaning assigned to such term
in Section 13.2(b).

     1.78 "Non-Registrational Studies" shall have the meaning assigned to such
term in Section 4.3(b).

     1.79 "North America" shall mean Canada and the United States.

     1.80  "Number  of Days to Make  Payment"  shall mean (i) until the end of
calendar year 2002, [**] days, (ii) during calendar year 2003, [**] days [**],
as  determined by the JCC prior to the end of calendar year 2002 making use of
the  previous  12 months  data  available  as of  October  31,  2002 and (iii)
beginning  with  calendar  year  2004  and  thereafter,  [**]  days  [**],  as
determined by the JCC prior to the end of each preceding  calendar year making
use of 12 months data  available as of the end of the month of October of such
preceding calendar year.

     1.81  "Offer"  shall  have  the  meaning  assigned  to  such  term in the
Acquisition Agreement.

     1.82 "Operating  Profit or Loss" shall have the meaning  assigned to such
term in the Financial Appendix.


                                       6





Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


     1.83 "Other  Compound"  shall mean that  compound  known as 2C6 anti-VEGF
receptor  monoclonal  antibody (or any human,  humanized  or chimeric  version
thereof, or any substitute therefor).

     1.84 "Other Operating  Income/Expense" shall have the meaning assigned to
such term in the Financial Appendix.

     1.85 "Partnering  Relationships"  shall have the meaning assigned to such
term in Section 3.6.

     1.86  "Party"  shall mean the  Company,  ERS, or BMS, as the case may be,
and, when used in the plural, shall mean the Company, ERS, and BMS.

     1.87 "Patents" shall mean the patents and patent  applications  set forth
on Exhibit  1.87,  together  with any patents that may issue  therefrom in any
country in the Territory,  and any other patents or patent applications in any
country in the  Territory  owned by or  exclusively  licensed  to the  Company
during  the term of this  Agreement  that cover any  Inventions  to the extent
relating to, derived from and useful for the  manufacture,  use or sale of the
Compounds  or the  Products  in the  Field in any  country  in the  Territory,
including    any    and    all    extensions,     renewals,     continuations,
continuations-in-part,      divisions,     patents-of-additions,     reissues,
supplementary  protection  certificates or foreign  counterparts of any of the
foregoing.

     1.88  "Person"  shall  mean  an  mean  an  individual  or a  corporation,
partnership,   association,  trust,  or  any  other  entity  or  organization,
including   a   government   or   political   subdivision   or  an  agency  or
instrumentality thereof.

     1.89  "Product"  shall  mean  any  prescription   pharmaceutical  product
comprising a Compound,  including any strength and packaging  configuration of
the final finished dosage form  presentation,  and any line extension  thereof
and,  when used in the  plural,  shall  mean all  prescription  pharmaceutical
products   comprising   Compounds,   including  all  strengths  and  packaging
configurations of the final finished dosage form  presentations,  and any line
extensions thereof.

     1.90  "Product  Development  Committee"  or "PDC"  shall have the meaning
assigned to such term in Section 2.3(a).

     1.91  "Proposed  Terms"  shall have the meaning  assigned to such term in
Section 3.5(b).

     1.92 "Q1," "Q2,"  "Q3," and "Q4" shall have the meaning  assigned to such
term in Section 8.3.

     1.93  "Registration"  shall  mean,  with  respect to each  country in the
Territory,  approval of the Registration  Application for any Product filed in
such  country,  including,  where  applicable  outside of the  United  States,
pricing or reimbursement approval by the Regulatory Authority in such country.

     1.94   "Registration   Application"   shall  mean  a  Biologics   License
Application  under the United States Federal Food,  Drug and Cosmetics Act and
the  regulations   promulgated   thereunder,   or  a  comparable   filing  for
Registration  in a  country,  in each  case  with  respect  to a  Product  for
application in the Field in the Territory.

     1.95  "Registrational  Studies"  shall have the meaning  assigned to such
term in Section 4.3(b).


                                       7





Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


     1.96  "Regulatory  Authority"  shall  mean the FDA in the  U.S.,  and any
health  regulatory  authority(ies)  in any country in the Territory  that is a
counterpart  to the FDA  and  holds  responsibility  for  granting  regulatory
marketing  approval  for a  Product  in such  country,  and  any  successor(s)
thereto.

     1.97 "Restricted  Period" shall have the meaning assigned to such term in
the Stockholder Agreement.

     1.98 "Sales  Costs"  shall have the meaning  assigned to such term in the
Financial Appendix.

     1.99 "Sales  Force  Guidelines"  shall have the meaning  assigned to such
term in Section 5.6(d).

     1.100 "Shares" shall mean shares of Common Stock.

     1.101 "Short-Term Inability to Supply" shall have the meaning assigned to
such term in Section 8.12(c).

     1.102   "Specifications"   shall   mean,   with   respect  to  API,   the
specifications  for  such  API as  agreed  upon by the  Company  and  ERS,  in
consideration of the regulatory requirements in each country in the Territory,
as may be amended from time to time.

     1.103  "Stockholder  Agreement"  shall have the meaning  assigned to such
term in the preliminary statements.

     1.104 "Subsidiary"  means, with respect to any Person, any corporation or
other  entity of which a  majority  of the  capital  stock or other  ownership
interests  having  ordinary  voting  power to elect a majority of the board of
directors  or  other  persons  performing  similar  functions  are at the time
directly or indirectly owned by such Person.

     1.105 "Summary Clinical Development Plan" shall mean the summary clinical
development  plan  attached as Exhibit  4.3(B),  and each  subsequent  summary
clinical development plan approved by the PDC pursuant to Section 4.3(d).

     1.106   "Technology"   shall  mean  the  Valid   Claims   and   Know-How,
collectively.

     1.107  "Termination Date" shall have the meaning assigned to such term in
the Acquisition Agreement.

     1.108 "Territory" shall mean the United States, Canada and Japan.

     1.109 "Testing  Methods" shall have the meaning  assigned to such term in
Section 8.7(c).

     1.110 "Third Party" shall mean any Person who or which is neither a Party
nor an Affiliate of a Party.

     1.111 "Third Party Change of Control  Transaction" shall have the meaning
assigned to such term in the Stockholder Agreement.

     1.112 "Third Party  Manufacturer"  shall mean Third Parties who have been
engaged by the  Company  to perform  services  or supply  facilities  or goods
(including, without limitation, the API and/or Finished Product) in connection
with the  manufacture,  testing  and/or  packaging of the API and/or  Finished
Product by the Company.


                                       8





Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


     1.113  "Trademarks"  shall mean the trademarks  registered to the Company
for the  marketing  of the Products in any country in the  Territory,  and the
trademarks selected by the JCC for use in the marketing of the Products in any
country in the Territory.

     1.114 "United  States" or "U.S." shall mean the United States of America,
including its possessions and territories.

     1.115 "Valid Claim" shall mean any claim of any Patents issued or pending
in a country in the Territory  relating to, derived from or useful for the use
and sale of the  Compounds or the  Products in the Field,  which claim has not
been  held  invalid  or   unenforceable  by  decision  of  a  court  or  other
governmental  agency of competent  jurisdiction,  unappealable  or  unappealed
within the time  allowed for appeal,  and which is not  admitted to be invalid
through disclaimer or otherwise not admitted by the Company to be invalid.

2. MANAGEMENT.

     2.1 Joint Executive Committee.

          (a) Members;  Officers.  Immediately  after the Effective  Date, the
Parties shall  establish a joint  executive  committee  (the "Joint  Executive
Committee" or "JEC"),  which shall consist of six members,  three members from
each of the Company and BMS.  The initial  members of the JEC are set forth on
Exhibit  2.1.  Each  of the  Company  and BMS  may  replace  any or all of its
representatives  on the JEC at any time  upon  written  notice to the other in
accordance with Section 16.5 of this Agreement.  Such representatives shall at
all  times  include  each such  Party's  [**] and most  senior  pharmaceutical
business  officer and one other senior officer of each such Party.  Any member
of the JEC may  designate a substitute to  temporarily  attend and perform the
functions  of that member at any meeting of the JEC.  The Company and BMS each
may, in its discretion,  invite  non-member  representatives  of such Party to
attend meetings of the JEC. The JEC shall be co-chaired by a representative of
each of the Company and BMS. The co-chairpersons  shall appoint a secretary of
the JEC, and such  secretary  shall serve for such term as  designated  by the
co-chairpersons.  The initial  co-chairpersons  and the initial  secretary are
designated on Exhibit 2.1.

          (b) Responsibilities. The JEC shall perform the following functions:

               (i) manage and oversee the development and commercialization of
the Compounds and Products pursuant to the terms of this Agreement;

               (ii)  review and  approve  the annual  budgets  and  multi-year
expense forecasts formulated by the PDC;

               (iii) at each meeting of the JEC, review a comparison of actual
expenses  to the  budgeted  expenses  for  the  year-to-date,  as  current  as
practicable to a date immediately prior to the date of the meeting;

               (iv) review and evaluate the progress of the other Committees;

               (v) review and approve  "go/no-go"  decisions and other matters
referred to the JEC by any other Committee;


                                       9





Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


               (vi) review  and, if  determined  to be  necessary,  reallocate
spending between the Clinical Budget and the relevant Marketing Budget;

               (vii)  establish and empower a finance  committee,  which shall
consist of an equal number of representatives from each of the Company and BMS
(the "Finance  Committee") to advise the JEC and make  recommendations  to the
JEC, for the areas it has responsibility as provided in Section 2.2, for which
the JEC has decision making authority;

               (viii)  at least  once each  year,  meet with each of the other
Committees  (which meetings do not need to include all of the other Committees
at the same meeting);

               (ix) in accordance  with the procedures  established in Section
2.1(d), resolve disputes,  disagreements and deadlocks unresolved by the other
Committees;

               (x) determine,  in response to the PDC's  findings  regarding a
material delay of an Initial  Regulatory  Filing,  whether or not it is in the
best interest of the Parties to go forward with the conduct of any  additional
clinical studies required by the FDA; and

               (xi) have such other responsibilities as may be assigned to the
JEC  pursuant  to this  Agreement  or as may be  mutually  agreed  upon by the
Parties from time to time.

          (c)  Meetings.  The JEC shall  meet in person at least  three  times
during every calendar  year,  and more  frequently as the Company and BMS deem
appropriate or as required to resolve disputes,  disagreements or deadlocks in
the other  Committees,  on such dates,  and at such places and times,  as such
Parties  shall  agree.  Meetings  of the JEC  that are  held in  person  shall
alternate  between  the offices of the Company and BMS, or such other place as
such  Parties may agree.  The members of the JEC also may convene or be polled
or  consulted  from  time  to  time  by  means  of  telecommunications,  video
conferences,  electronic  mail  or  correspondence,  as  deemed  necessary  or
appropriate.

          (d) Decision-making.

               (i) The JEC may make  decisions  with  respect  to any  subject
matter that is subject to the JEC's decision-making authority and functions as
set forth in Section 2.1(b). Except as specified in Section 2.1(d)(ii),  (iii)
or (iv),  all decisions of the JEC shall be made by unanimous  vote or written
consent, with the Company and BMS each having,  collectively,  one vote in all
decisions.  The JEC shall use  reasonable  best efforts to resolve the matters
within its roles and functions or otherwise referred to it.

               (ii) With  respect  to any  Critical  Issue,  if the JEC cannot
reach consensus within five business days after the matter has been brought to
the JEC's  attention,  the matter shall be referred on the sixth business day:
(A) if the matter is the  subject of a deadlock  arising in the PDC and is not
the subject of Section 4.8 or 4.9, to the co-chairperson of the JEC designated
by the  Company  for  resolution,  provided  that  any  decision  made  by the
co-chairperson  of the JEC  designated  by the  Company may not  increase  the
Clinical  Budget for any one year by more than [**];  (B) if the matter is the
subject of a deadlock  arising in the JCC (other than a matter  under  Section
2.4(b)(xiv)  with respect to  Trademarks),  to the  co-chairperson  of the JEC
designated  by BMS for  resolution,  provided  that any  decision  made by the
co-chairperson  of the JEC designated by BMS may only increase or decrease the
overall amount of the relevant  Marketing Budget within the ranges


                                      10





Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


provided in and otherwise in accordance with Section 5.2; (C) if the matter is
under Section  2.4(b)(xiv)  with respect to Trademarks and is the subject of a
deadlock  arising in the JCC, to the  co-chairperson  of the JEC designated by
the Company for resolution;  and (D) except as provided in Section 8.12(f), if
the  matter  is  the  subject  of a  deadlock  arising  in  the  JMC,  to  the
co-chairperson  of the JEC  designated by the Company for  resolution.  In the
event  that the  co-chairperson  designated  to  resolve a dispute  under this
Section  2.1(d)(ii) is not  immediately  available,  then such matter shall be
referred  to the senior  executive  officer of such Party in the area to which
the  matter  relates  and who has  been  designated  by such  Party  for  such
resolution.

               (iii) With respect to all other matters that are subject to the
JEC's decision-making  authority,  if the JEC cannot reach consensus within 20
business  days after it has met and  attempted  to reach such  consensus,  the
matter shall be referred on the  twenty-first  business day: (A) if the matter
is the  subject  of a deadlock  arising  in the PDC and is not the  subject of
Section 4.8 or 4.9, to the co-chairperson of the JEC designated by the Company
for resolution,  provided that any decision made by the  co-chairperson of the
Company may not  increase  the  Clinical  Budget for any one year by more than
[**]; (B) if the matter is the subject of a deadlock arising in the JCC (other
than a matter under Section  2.4(b)(xiv)  with respect to Trademarks),  to the
co-chairperson of the JEC designated by BMS for resolution,  provided that any
decision  made by the  co-chairperson  of BMS may not increase or decrease the
overall amount of the relevant  Marketing Budget within the ranges provided in
and  otherwise  in  accordance  with  Section  5.2; (C) if the matter is under
Section  2.4(b)(xiv)  with  respect  to  Trademarks  and is the  subject  of a
deadlock  arising in the JCC, to the  co-chairperson  of the JEC designated by
the Company for resolution;  and (D) except as provided in Section 8.12(f), if
the  matter  is  the  subject  of a  deadlock  arising  in  the  JMC,  to  the
co-chairperson of the JEC designated by the Company for resolution.

               (iv) In the event of a  deadlock  of the JEC with  respect to a
Critical  Issue that is not  resolved  pursuant to clause (ii) and the matters
underlying  such  deadlock  fall  into  the  class  of  disputes  that  may be
arbitrated by the Parties in accordance with Section 16.13,  then such matters
shall be  resolved  pursuant  to the  Accelerated  Arbitration  Provisions  of
Section  16.13(b).  In the event of a deadlock of the JEC with  respect to any
other matters that are not resolved  pursuant to clause (iii) and such matters
fall into the class of  disputes  that may be  arbitrated  by the  Parties  in
accordance with Section 16.13, then such matters shall be resolved pursuant to
Section 16.13(a).

               (v) For all purposes  under this  Agreement,  any decision made
pursuant to this Section 2.1(d) shall be deemed to be the decision of the JEC.

     2.2 Finance Committee.  The Finance Committee shall perform the following
functions:

          (a)  clarify  questions  and  ambiguities  arising  from  the use or
application, as appropriate, in the relevant Territory of the accounting terms
used  in  this  Agreement,   including  without  limitation,   Fully  Burdened
Manufacturing  Costs,  Net  Sales,  Cost of  Goods  Sold,  Development  Costs,
Distribution Costs,  Marketing Costs, Sales Costs,  General and Administrative
Expense, Other Operating Income/Expense,  Gross Profit and Operating Profit or
Loss;

          (b) set up systems  necessary  to capture  such costs and profits or
losses (including,  without limitation,  developing the methodology to be used
to determine Other Operating  Income/Expense  in accordance with the Financial
Appendix);

          (c) establish parameters and mechanisms for management and financial
reporting;


                                      11





Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


          (d) assist in reviewing manufacturing and marketing options;

          (e) assist in developing and  overseeing  allocation of the Clinical
Budget and the Marketing  Budgets for each of the Clinical  Development  Plans
and Marketing  Plans,  respectively,  and reviewing the actual  expenditure of
such  allocated  funds to ensure  consistency  with such Clinical  Development
Plans and Marketing Plans;

          (f) have such other  responsibilities  as may be assigned by the JEC
to the  Finance  Committee  pursuant to this  Agreement  or as may be mutually
agreed upon by the Parties from time to time.

     2.3 Product Development Committee.

          (a) Members;  Officers.  Immediately  after the Effective  Date, the
Parties  shall  establish  a  product  development   committee  (the  "Product
Development  Committee"  or "PDC"),  which shall consist of an equal number of
representatives  from each of the Company  and BMS,  up to a maximum  total of
eight members on such  Committee.  Each of the Company and BMS may replace any
or all of its  representatives  on the PDC at any time upon written  notice to
the  other  in  accordance   with  Section  16.5  of  this   Agreement.   Such
representatives shall include individuals within the senior management of each
such Party, and those  representatives of each such Party shall,  individually
or collectively,  have expertise in  pharmaceutical  drug  development  and/or
marketing.  Any member of the PDC may  designate a substitute  to  temporarily
attend and perform the functions of that member at any meeting of the PDC. The
Company and BMS each may, in its discretion, invite non-member representatives
of such  Party to attend  meetings  of the PDC.  The PDC shall be chaired by a
representative  of  the  Company.   The  secretary  of  the  PDC  shall  be  a
representative of BMS.

          (b) Responsibilities. The PDC shall perform the following functions:

               (i) manage  and  oversee  the  implementation  of the  Clinical
Development  Plans,  except the  Non-Registrational  Studies;

               (ii)  review  and  approve  each  subsequent  summary  clinical
development plan in accordance with Section 4.3(d);

               (iii) review and approve each subsequent  clinical  development
plan in accordance with Section 4.3(e);

               (iv) review and approve any amendments or  modifications of the
Clinical Development Plans or the Clinical Budget;

               (v) at each meeting of the PDC,  review a comparison  of actual
clinical  development and regulatory  expenses to the budgeted expenses in the
Clinical  Budget for the  year-to-date,  as current as  practicable  to a date
immediately prior to the date of the meeting;

               (vi)  review  and  evaluate  progress  of  the   Registrational
Studies;  provided  that  the  PDC  shall  not  have  authority  to  make  any
determination that any Party is in breach of this Agreement;


                                      12





Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


               (vii)  review and approve all  compassionate  use of  Products;

               (viii)  review  and  approve  the  joint  publication  strategy
together with the JCC;

               (ix) review and approve "go/no-go" decisions; and

               (x) have such other  responsibilities as may be assigned to the
PDC  pursuant  to this  Agreement  or as may be  mutually  agreed  upon by the
Parties from time to time.

          (c)  Meetings.  The PDC shall  meet in person at least  once  during
every  calendar  quarter,  and more  frequently  as the  Company  and BMS deem
appropriate  or as reasonably  requested by either such Party,  on such dates,
and at such places and times, as such Parties shall agree. Meetings of the PDC
that are held in person shall alternate between the offices of the Company and
BMS,  or such other place as such  Parties  may agree.  The members of the PDC
also may  convene  or be  polled  or  consulted  from time to time by means of
telecommunications,  video conferences,  electronic mail or correspondence, as
deemed necessary or appropriate.

          (d) Decision-making.  The PDC may make decisions with respect to any
subject  matter  that is subject to the PDC's  decision-making  authority  and
functions as set forth in Section  2.3(b).  All  decisions of the PDC shall be
made by  unanimous  vote or written  consent,  with the  Company  and BMS each
having,  collectively,  one  vote in all  decisions.  If,  with  respect  to a
Critical Issue that is subject to the PDC's decision-making authority, the PDC
cannot reach  consensus  within five  business days after it has first met and
attempted to reach such  consensus,  the matter shall be referred on the sixth
business day to the Joint Executive Committee for resolution. If, with respect
to any other  matter that is subject to the PDC's  decision-making  authority,
the PDC  cannot  reach  consensus  within  20 days  after it has first met and
attempted  to reach  such  consensus,  the  matter  shall be  referred  on the
twenty-first  day to the Joint  Executive  Committee for  resolution.  For all
purposes  under this  Agreement,  any decision  made  pursuant to this Section
2.3(d) shall be deemed to be the decision of the PDC.

     2.4 Joint Commercialization Committee.

          (a) Members;  Officers.  Immediately  after the Effective  Date, the
Parties  shall  establish  a joint  commercialization  committee  (the  "Joint
Commercialization Committee" or "JCC"), which shall consist of an equal number
of representatives  from each of the Company and BMS, up to a maximum total of
eight members on such  Committee.  Each of the Company and BMS may replace any
or all of its  representatives  on the JCC at any time upon written  notice to
the  other  in  accordance   with  Section  16.5  of  this   Agreement.   Such
representatives shall include individuals within the senior management of each
such Party, and those  representatives of each such Party shall,  individually
or  collectively,  have  clinical  experience  and  expertise in marketing and
sales. Any member of the JCC may designate a substitute to temporarily  attend
and  perform  the  functions  of that  member at any  meeting of the JCC.  The
Company and BMS each may, in its discretion, invite non-member representatives
of such  Party to attend  meetings  of the JCC.  The JCC shall be chaired by a
representative  of BMS. The secretary of the JCC shall be a representative  of
the Company.

          (b) Responsibilities. The JCC shall perform the following functions:

               (i) oversee the preparation and implementation of the Marketing
Plans;


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Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


               (ii) oversee and  coordinate  the sales  efforts of ERS and the
Company;

               (iii) review and approve Marketing Plans;

               (iv)  discuss  the state of the  markets  for  Products  in the
Territory and opportunities and issues concerning the commercialization of the
Products,  including  consideration  of marketing  and  promotional  strategy,
marketing research plans,  labeling,  Product  positioning and Product profile
issues,  to determine in which countries in the Territory to launch  Products,
the priority for same and the amount and kind of marketing and selling  effort
appropriate, in accordance with the Marketing Plans;

               (v) review and approve Non-Registrational  Studies, taking into
consideration the  appropriateness in the context of the overall marketing and
promotional strategy for the Products;

               (vi) review and approve all pricing  decisions and managed care
contracting strategies, in accordance with the Marketing Plans;

               (vii) review and approve all indigent care use of Products;

               (viii)  periodically  review sales mix of Products  sold by ERS
through various customer channels;

               (ix)  review  and  approve  allocations  within  the  Marketing
Budgets, from time to time;

               (x) review and  approve  each  subsequent  marketing  budget in
accordance with Section 5.2(c);

               (xi) review  data and reports  arising  from and  generated  in
connection  with the  commercialization  of the Products,  including,  but not
limited to the Marketing Plans, Marketing Budgets and sales forecasts;

               (xii) at each meeting of the JCC, review a comparison of actual
sales  and  marketing  expenses  to the  budgeted  expenses  in  the  relevant
Marketing  Budget for the  year-to-date,  as current as  practicable to a date
immediately prior to the date of the meeting;

               (xiii) review and approve the general guidelines  applicable to
particular  Products to be followed by ERS in its  development  of promotional
materials and promotional  activities to be used by ERS and the Company in the
promotion of such Products  (such  guidelines  to be consistent  with the then
current Marketing Plan applicable to such Products);

               (xiv)  consider  and  select  Trademarks  to be  used  for  the
marketing and sale of the Products in each country in the Territory;

               (xv) review and approve the joint publication strategy together
with the PDC;


                                      14





Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


               (xvi) evaluate and determine the existence or  non-existence of
a Co-Promotion  Problem referred to the JCC in accordance with Section 5.6(e);
and

               (xvii) have such other  responsibilities  as may be assigned to
the JCC pursuant to this  Agreement  or as may be mutually  agreed upon by the
Parties from time to time.

          (c)  Meetings.  The JCC shall  meet in person at least  once  during
every  calendar  quarter,  and more  frequently  as the  Company  and BMS deem
appropriate  or as reasonably  requested by either such Party,  on such dates,
and at such places and times, as such Parties shall agree. Meetings of the JCC
that are held in person shall alternate between the offices of the Company and
BMS,  or such other place as such  Parties  may agree.  The members of the JCC
also may  convene  or be  polled  or  consulted  from time to time by means of
telecommunications,  video conferences,  electronic mail or correspondence, as
deemed necessary or appropriate.

          (d) Decision-making.  The JCC may make decisions with respect to any
subject  matter  that is subject to the JCC's  decision-making  authority  and
functions as set forth in Section  2.4(b).  All  decisions of the JCC shall be
made by  unanimous  vote or written  consent,  with the  Company  and BMS each
having,  collectively,  one  vote in all  decisions.  If,  with  respect  to a
Critical Issue that is subject to the JCC's decision-making authority, the JCC
cannot reach  consensus  within five  business days after it has first met and
attempted to reach such  consensus,  the matter shall be referred on the sixth
business day to the Joint Executive Committee for resolution. If, with respect
to any other  matter that is subject to the JCC's  decision-making  authority,
the JCC  cannot  reach  consensus  within  20 days  after it has first met and
attempted  to reach  such  consensus,  the  matter  shall be  referred  on the
twenty-first  day to the Joint  Executive  Committee for  resolution.  For all
purposes  under this  Agreement,  any decision  made  pursuant to this Section
2.4(d) shall be deemed to be the decision of the JCC.

     2.5 Joint Manufacturing Committee.

          (a) Members;  Officers.  Immediately  after the Effective  Date, the
Parties  shall   establish  a  joint   manufacturing   committee  (the  "Joint
Manufacturing  Committee" or "JMC"), which shall consist of an equal number of
representatives  from each of the Company  and BMS,  up to a maximum  total of
eight members on such  Committee.  Each of the Company and BMS may replace any
or all of its  representatives  on the JMC at any time upon written  notice to
the  other  in  accordance   with  Section  16.5  of  this   Agreement.   Such
representatives  shall be  comprised of members of senior  management  of each
such  Party  with  expertise  in  manufacturing.  Any  member  of the  JMC may
designate a substitute to temporarily attend and perform the functions of that
member  at any  meeting  of the JMC.  The  Company  and BMS each  may,  in its
discretion, invite non-member representatives of such Party to attend meetings
of the JMC. Except as provided in Section 8.12(f), the JMC shall be chaired by
a  representative  of the  Company.  The  secretary  of  the  JMC  shall  be a
representative of BMS.

          (b) Responsibilities. The JMC shall perform the following functions:

               (i) oversee and coordinate the  manufacturing and supply of API
and Finished Products;


                                      15





Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


               (ii)  formulate and direct the  manufacturing  strategy for the
Products,  including,  without limitation, bulk drug production,  formulation,
filling and finishing of the Products,  and approve  facilities to be used for
such manufacture and production;

               (iii)  evaluate  and  determine  the  existence  of a Long-Term
Inability to Supply  referred to the JMC in accordance  with Section  8.12(e);
and

               (iv) have such other responsibilities as may be assigned to the
JMC  pursuant  to this  Agreement  or as may be  mutually  agreed  upon by the
Parties from time to time.

          (c)  Meetings.  The JMC shall  meet in person at least  once  during
every  calendar  quarter,  and more  frequently  as the  Company  and BMS deem
appropriate  or as reasonably  requested by either such Party,  on such dates,
and at such places and times, as such Parties shall agree. Meetings of the JMC
that are held in person shall alternate between the offices of the Company and
BMS,  or such other place as such  Parties  may agree.  The members of the JMC
also may  convene  or be  polled  or  consulted  from time to time by means of
telecommunications,  video conferences,  electronic mail or correspondence, as
deemed necessary or appropriate.

          (d) Decision-making.  The JMC may make decisions with respect to any
subject  matter  that is subject to the JMC's  decision-making  authority  and
functions as set forth in Section  2.5(b).  All  decisions of the JMC shall be
made by  unanimous  vote or written  consent,  with the  Company  and BMS each
having,  collectively,  one  vote in all  decisions.  If,  with  respect  to a
Critical Issue that is subject to the JMC's decision-making authority, the JMC
cannot reach  consensus  within five  business days after it has first met and
attempted to reach such  consensus,  the matter shall be referred on the sixth
business day to the Joint Executive Committee for resolution. If, with respect
to any other  matter that is subject to the JMC's  decision-making  authority,
the JMC  cannot  reach  consensus  within  20 days  after it has first met and
attempted  to reach  such  consensus,  the  matter  shall be  referred  on the
twenty-first  day to the Joint  Executive  Committee for  resolution.  For all
purposes  under this  Agreement,  any decision  made  pursuant to this Section
2.5(d) shall be deemed to be the decision of the JMC.

     2.6 Minutes of Committee Meetings.

          (a) Subject to Section 2.6(b),  definitive  minutes of all Committee
meetings  shall be  finalized no later than 30 days after the meeting to which
the minutes pertain, as follows:

               (i) Within ten days after a Committee meeting, the secretary of
such  Committee  shall prepare and distribute to all members of such Committee
and each Alliance  Manager  draft  minutes of the meeting.  Such minutes shall
provide a list of any actions,  decisions or  determinations  approved by such
Committee  and a list of any issues yet to be  resolved,  either  within  such
Committee or through the relevant escalation process.

               (ii) The  Alliance  Managers  shall  then  have ten days  after
receiving such draft minutes to collect  comments  thereon from the members of
its Party and provide them to the secretary of such Committee.

               (iii) Upon the  expiration of such second ten-day  period,  the
Alliance Managers and the secretary of such Committee shall have an additional
ten days to discuss  each


                                      16





Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


other's comments and finalize the minutes. The secretary and chairperson(s) of
such Committee  shall each sign and date the final  minutes.  The signature of
such  chairperson(s)  and secretary upon the final minutes shall indicate each
Party's assent to the minutes.

          (b) If at any  time  during  the  preparation  and  finalization  of
Committee  meeting  minutes,  the secretary of such Committee and the Alliance
Managers  do not agree on any issue with  respect to the  minutes,  such issue
shall be resolved as provided in Section 2.3(d), 2.4(d) or 2.5(d), as the case
may be. The decision resulting from the foregoing process shall be recorded by
the secretary in amended finalized minutes for said meeting.  All other issues
in the  minutes  that  are not  subject  to the  foregoing  process  shall  be
finalized within the 30-day period as provided in Section 2.6(a).

     2.7 Term.  Each Committee shall exist until the termination or expiration
of this  Agreement,  or for such  longer  period as  necessary  to perform the
remaining responsibilities assigned to it under this Agreement.

     2.8 Expenses.  Each Party shall be responsible for all travel and related
costs  and  expenses  for its  members  and  other  representatives  to attend
meetings of, and otherwise participate on, a Committee.

     2.9 Alliance Managers.  Each of the Company, on the one hand, and BMS and
ERS collectively,  on the other hand, shall appoint one senior  representative
who possesses a general understanding of clinical,  regulatory,  manufacturing
and  marketing  issues  to act as its  respective  alliance  manager  for this
relationship (each, an "Alliance Manager").  The initial Alliance Managers are
set forth on Exhibit 2.1.  Each of the Company,  on the one hand,  and BMS and
ERS  collectively,  on the other hand,  may replace  its  respective  Alliance
Manager  at any time  upon  written  notice to the  other in  accordance  with
Section  16.5  of  this  Agreement.  Any  Alliance  Manager  may  designate  a
substitute to temporarily perform the functions of that Alliance Manager. Each
Alliance   Manager   shall  be  charged  with   creating  and   maintaining  a
collaborative work environment within and among the Committees.  Each Alliance
Manager will also be responsible for:

          (a)  Coordinating  the relevant  functional  representatives  of the
Parties, in developing and executing  strategies and plans for the Products in
an effort to ensure consistency and efficiency within the Territory;

          (b) providing a single point of communication  for seeking consensus
both  internally  within the  respective  Party's  organizations  and together
regarding key strategy and plan issues;

          (c)  identifying  and  raising  cross-country,   cross-Party  and/or
cross-functions disputes to the appropriate Committee in a timely manner; and

          (d)  planning  and  coordinating:  (i)  cooperative  efforts  in the
Territory; and (ii) internal and external communications.

     The Alliance  Managers shall be entitled to attend meetings of any of the
Committees,  but  shall  not  have,  or be  deemed  to  have,  any  rights  or
responsibilities of a member of any Committee. Each Alliance Manager may bring
any matter to the  attention  of any  Committee  where such  Alliance  Manager
reasonably believes that such matter requires such attention.


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Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


3. GRANT OF RIGHTS.

     3.1 Rights  Granted to ERS.  Subject to the terms and  conditions of this
Agreement, the Company hereby grants to ERS:

          (a) An  exclusive  right to  distribute,  and a  co-exclusive  right
(together  with the  Company) to develop and  promote,  the  Products in North
America.

          (b)  A  co-exclusive  right  to  develop,   distribute  and  promote
(together  with the Company and the Merck  Entities,  in the case of the Merck
Entities pursuant to the Merck Agreement) the Products in Japan.

     3.2  Restrictions  on the Company.  The Company  shall not, and shall not
grant any rights or licenses to any Third Party or otherwise  permit any Third
Party to,  develop the Compounds  for animal  health or any other  application
outside the Field without the prior written consent of ERS, which shall not be
unreasonably withheld.

     3.3 License to ERS  Inventions.  ERS hereby grants to the Company and its
Affiliates a [**] license,  without the right to grant sublicenses (other than
to the Merck  Entities  for use in Japan and to any Person for use outside the
Territory),  to use any ERS  Inventions and any patents owned or controlled by
ERS solely to the extent related to any ERS Inventions, solely for the purpose
of  developing,  using,  manufacturing,  distributing,  promoting  and selling
Compounds  and Products in the Field;  provided,  however the license  granted
under this Section 3.3 expressly [**] the right of (i) [**] to [**],  directly
or  indirectly,  any Compound or Product  distributed or sold by [**], or (ii)
[**],  directly or indirectly,  any Compound or Product distributed or sold by
such [**].

     3.4 Trademarks; Logos.

          (a) The Company hereby grants ERS the non-exclusive right to use the
Trademarks in the Territory in  connection  with the Products,  subject to the
provisions  of this  Agreement  and for the term hereof.  Solely in connection
with ERS's promotion,  distribution and sale of Products in the Territory, ERS
shall  market the  Products  throughout  the  Territory  under the  applicable
Trademarks  for  the  relevant  country  in  the  Territory.  The  use  of the
Trademarks by ERS shall be subject to the prior review and approval of the JCC
as set forth in this Section 3.4.

          (b) ERS shall permit duly authorized  representatives of the Company
to inspect,  on the premises of ERS, at all  reasonable  times,  the Products,
ERS's quality control records, and ERS's facilities used in or relating to the
manufacture,  distribution  or sale of the Products to insure  compliance with
cGMP  and  the  quality   control   standards  set  forth  in  the  applicable
Registration Application.

          (c) Whenever ERS uses the  Trademarks in advertising or in any other
manner in  connection  with the  Products,  ERS  shall  clearly  indicate  the
Company's  ownership of the  Trademarks.  At least ten business  days prior to
ERS's use of the  Trademarks,  ERS shall  provide the JCC with  samples of all
literature and  advertising  using the  Trademarks  prepared by or for ERS and
intended  to be  used by ERS  for  approval  of  such  use by the  JCC.  If no
objection is received from the JCC within five business days of receipt by the
JCC of such  samples,  ERS may use the  Trademarks  in the manner  used in the
samples  submitted to the JCC for approval.  When using the  Trademarks


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Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


under this  Agreement,  ERS  undertakes to comply with all laws  pertaining to
trademarks in force at any time in the Territory.

          (d) If  necessary  in any country in the  Territory to permit ERS to
use the  Trademarks,  the Company shall make  application to register ERS as a
permitted user or registered user of the Trademarks  and, if necessary,  or if
requested by the Company,  ERS undertakes to join in such  application  and to
take such action as may be  necessary or requested by the Company to implement
such application or retain, enforce or defend the Trademarks.  If necessary in
any  country  in  the  Territory  to  maintain  the  Company's  rights  in the
Trademarks, ERS shall enter into a registered user agreement or permitted user
agreement regulating its use of the Trademarks.

          (e)  ERS  acknowledges   that  the  Company  is  the  owner  of  the
Trademarks.  ERS shall not at any time do, cause to be done, or permit any act
or thing inconsistent  with,  contesting or in any way impairing or tending to
impair such ownership.  ERS agrees that all use of the Trademarks by ERS shall
inure to the benefit of and be on behalf of the Company. ERS acknowledges that
nothing in this Agreement  shall give ERS any right,  title or interest in the
Trademarks  other than the right to use the Trademarks in accordance with this
Agreement. ERS agrees that it will not challenge the title or ownership of the
Company to the Trademarks or attack or contest the validity of the Trademarks.

          (f)  The  Company  shall  register  and  maintain,  or  cause  to be
registered and  maintained,  in  consultation  with ERS, the Trademarks in the
Territory during the term of this Agreement at the Company's sole expense.  If
any Party  learns of any actual,  alleged or  threatened  unauthorized  use or
other  infringement  of the Trademarks by others in the Territory,  such Party
agrees to promptly notify the other Parties of such  unauthorized use or other
infringement.  The Company shall use reasonable efforts to retain,  enforce or
defend the Trademarks.

          (g) To  the  extent  permitted  by  law,  all  labeling,  packaging,
literature,  promotional  material  and  advertising  for  any  Product  to be
marketed,  distributed  or sold in any country in the Territory  shall contain
the Company's  name and logo with  comparable  prominence as the name and logo
used by ERS. To the extent  practicable,  or as required by applicable  law to
protect  the  Trademarks,  ERS  shall  include  on any  material  bearing  any
Trademarks  an  acknowledgement  that such  Trademark  is the  property of the
Company.

     3.5 Right of First Offer to ERS Regarding the Other Compound.  During the
period of time  commencing on the Effective Date and ending on the First Offer
Termination  Date,  ERS shall have,  and the Company  hereby  grants to ERS, a
right of first offer to enter into a partnering  arrangement  with the Company
for the Other Compound, as follows:

          (a) In the event that the Company is interested in seeking any Third
Party partnering  arrangement  with respect to the Other Compound  (whether by
granting a license or other rights to a Third  Party),  the Company shall give
written  notice  thereof  to ERS,  together  with  any and all  materials  and
relevant  information  and data  regarding the Other Compound that the Company
has in its possession or control. ERS shall have 30 days after receipt of such
written notice and all such  information  and data to decide whether or not it
is interested in entering into negotiations for such a partnering  arrangement
with the Company for the Other Compound.

          (b) If ERS notifies the Company in writing within such 30-day period
that it is  interested  in  negotiating  such a  partnering  arrangement,  the
Company shall provide ERS with written  notice of its proposed  material terms
and  conditions of such  arrangement  ("Proposed  Terms").  The Proposed Terms
shall  include  all  material  terms  and  conditions  of  such   arrangement,
including,


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Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


without limitation, the scope of the proposed arrangement, the financial terms
and any  technology  or  compound  quid pro  quo.  ERS and the  Company  shall
promptly commence good faith negotiations  (including a review of all relevant
data and information of clinical significance relating to the Other Compound),
for a period of up to 90 days after ERS receives such Proposed  Terms from the
Company,  in an  effort  to  reach  mutually  acceptable  material  terms  and
conditions for such arrangement,  which material terms and conditions shall be
set forth in a written  letter of intent  ("Letter  of  Intent").  During such
90-day  period,  the  Company  shall  not  negotiate  with any  Third  Party a
potential  partnering  arrangement  with such Third Party with  respect to the
Other Compound.

          (c) If,  despite each of ERS's and the Company's good faith efforts,
the  Company  and ERS are  not  able to  agree  on  such  material  terms  and
conditions  and do not  execute a Letter  of Intent by the end of such  90-day
period, ERS shall provide to the Company (within five business days) a written
notice  setting  forth the terms ERS will agree to for such  arrangement  (the
"ERS Proposed Terms"). The Company shall then have 15 days to accept or reject
the ERS  Proposed  Terms.  If the Company  declines to accept the ERS Proposed
Terms within such 15-day period,  then the Company may enter into negotiations
with any Third Party regarding the Other Compound, provided, however, that the
terms and  conditions  of any  agreement  with a Third  Party shall be no more
favorable, in the aggregate, to such Third Party than the ERS Proposed Terms.

     3.6 Right of First Negotiation of ERS Regarding Partnering  Transactions.
At any time during the  Restricted  Period,  ERS shall  have,  and the Company
hereby grants to ERS, a right of first  negotiation to enter into a partnering
arrangement   with   the   Company   (including,   without   limitation,   any
co-development,  co-promotion, research and development,  commercialization or
intellectual property license agreement, joint venture,  partnership, or other
partnering relationship) involving compounds or products not directly relating
to the Other Compound,  to the extent  involving the  out-licensing  of any of
intellectual property or know-how owned by the Company or to which the Company
has an exclusive license ("Partnering Relationship").

          (a) In the event that the Company is  interested in  establishing  a
such  Partnering  Relationship  with a Third  Party,  the  Company  shall give
written  notice  thereof  to ERS,  together  with  any and all  materials  and
relevant  information  and data  regarding the subject matter of such proposed
Partnering Relationships that the Company has in its possession or control.

          (b) With  respect to each such  Partnering  Relationship,  ERS shall
have 90 days after receipt of such written notice and all such information and
data  to  enter  into a  non-binding  heads  of  agreement  with  the  Company
containing  the  proposed  material  terms  of  an  agreement  regarding  such
Partnering Relationship. During such 90-day time period, the Company shall not
negotiate such a Partnering  Relationship  with any Third Party.  In the event
that ERS and the Company do not enter into a non-binding heads of agreement as
aforesaid,  the  Company  shall be free to  proceed  to  negotiate  with Third
Parties as it deems appropriate without any further obligation to ERS.

     3.7 Negotiation of Services. As soon as reasonably  practicable after the
Effective Date, the Parties will negotiate in good faith the Company's  access
to ERS's and BMS's  research and  development  services,  including  medicinal
chemistry, high throughput screening,  genomics, etc., and the extent to which
and terms on which such services will be made available to the Company.

     3.8  Restrictions  on  Competing  Products.  Except as  permitted by this
Section  3.8,  during  the  period  from  the  Effective  Date to the  seventh
anniversary of the Effective  Date, each Party agrees not to, and to cause its
Affiliates  not  to,  directly  or  indirectly,  develop  or  commercialize  a
Competing  Product in any country in the Territory.  In the event that a Party
(an  "Acquiring  Party")  proposes  to develop or  commercialize  a  Competing
Product or  purchases or  otherwise  takes  control of a Third Party which has
developed or  commercialized  (and is  continuing  to produce or sell),  or is
developing


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Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


or commercializing,  a Competing Product (directly or indirectly), in any such
case within the Territory, the Acquiring Party shall, at its option, either:

          (a)  divest,  or cause  its  applicable  Affiliate  to  divest,  the
Competing Product within 12 months after such event; or

          (b) offer to the  Company (in the case of BMS or ERS) or ERS (in the
case  of  the  Company),  (the  "Non-Acquiring  Party"),  the  right  to:  (i)
participate  in  50%  of the  Acquiring  Party's  rights  and  obligations  in
connection  with  the  development  and  commercialization  of  the  Competing
Product;  or  (ii)  acquire  50%  of the  Acquiring  Party's  interest  in the
Competing  Product at a valuation  which is in proportion to the price paid by
the Acquiring  Party for the Competing  Product.  In such event,  such Parties
shall conduct good faith discussions  regarding the terms of such arrangement.
In the event that such Parties do not reach  agreement  on such terms,  or the
Non-Acquiring Party declines to participate or acquire such an interest in the
Competing  Product,  then the Acquiring Party shall be required to divest,  or
cause its  applicable  Affiliate to divest,  the Competing  Product  within 12
months after such event.

     3.9 The Company's Right to Develop and Market Products.

          (a)  In  the  event  that  the  Company  believes  that  ERS  is not
adequately performing its obligations and responsibilities  under the relevant
Clinical Development Plan or the Marketing Plan, the Company shall provide ERS
with written notice of such claim including  specification  of the respects in
which  the  Company   believes  ERS  is  not  meeting  such   obligations  and
responsibilities  with  reasonable  particularity.  The PDC or the JCC, as the
case may be, shall  promptly  meet to discuss  such claims.  If the PDC or the
JCC, as the case may be, does not reach a consensus decision,  then the matter
shall  be  referred  to  the  JEC  for  resolution,   provided  that  Sections
2.1(d)(ii), (iii) and (iv) shall not apply with respect to such matter. If the
JEC does not reach  consensus  decision  on the  matter,  then the Company may
submit the  matter to  arbitration  pursuant  to the  Accelerated  Arbitration
Provisions set forth in Section 16.13(b).

          (b) If a determination  is made pursuant to Section  3.9(a),  by the
PDC,  the JCC,  the JEC or the  arbitrators,  as the case may be, that ERS has
failed to adequately perform such obligations and  responsibilities,  then the
Company may perform such  obligations  and  responsibilities  to the extent it
reasonably deems  appropriate.  The Company's  performance of such obligations
and responsibilities  pursuant to this Section shall be reasonably  consistent
with  the  scope  of  performance  of such  obligations  and  responsibilities
contemplated to be performed by ERS in the relevant Clinical  Development Plan
or Marketing Plan, as the case may be.

          (c) Provided  that the  performance  by the Company is in accordance
with the scope of such performance  contemplated by Section 3.9(b),  ERS shall
reimburse the Company for all of the Company's Development Costs, Distribution
Costs, Sales Costs, Marketing Costs and Other Operating Income/Expense, as the
case  may be,  incurred  by the  Company  with  respect  to such  actions.  In
addition,  if the Company elected to commence  performance of such obligations
and  responsibilities  prior to a determination being made pursuant to Section
3.9(a),  and such  determination is that ERS has failed to adequately  perform
such  obligations and  responsibilities,  then ERS shall reimburse the Company
for  all  such  costs  incurred  by the  Company  prior  to the  date  of such
determination,  but only for such  costs  incurred  by the  Company  that were
necessary to satisfy the performance  obligations and responsibilities that it
is determined ERS failed to adequately provide.


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Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


          (d)  If  such  failure  to  perform  is  in  connection  with  ERS's
obligations and  responsibilities  in Japan,  then ERS shall have the right to
include any amount paid to the Company pursuant to this Section as Development
Costs, Distribution Costs, Sales Costs, Marketing Costs and/or Other Operating
Income/Expense,  as the case may be, for  purposes  of  calculating  Operating
Profit or Loss.

          (e) In no event shall ERS be  obligated  pursuant to this Section to
reimburse the Company for any costs  incurred by the Company  pursuant to this
Section 3.9 unless: (i) the relevant  Committee reaches a consensus  decision,
or  the  arbitrators  find,  that  ERS  failed  to  adequately   perform  such
obligations and  responsibilities;  or (ii) ERS otherwise consents in writing.
The rights of the Company  under this  Agreement  shall not be affected in any
way by the Company's waiver or failure to take action pursuant to this Section
3.9. Any rights  provided to the Company  pursuant to this Section shall be in
addition to any other rights or remedies  available to the Company  under this
Agreement, at law or in equity.

4. DEVELOPMENT AND REGULATORY MATTERS.

     4.1 Exchange of Data and Know-How.

          (a) The  Parties  acknowledge  that the Company is in the process of
conducting  clinical  studies on the  Product  necessary  to make the  Initial
Regulatory Filing. Therefore, until the Initial Regulatory Filing is made (the
"BLA Filing Date"), the Company shall be primarily  responsible for conducting
the clinical studies and all other regulatory matters,  manufacturing  matters
and/or pre-clinical studies necessary to support, prepare and file the Initial
Regulatory  Filing  until the BLA Filing Date,  and the Company  shall use all
commercially  reasonable  efforts  necessary  to make the  Initial  Regulatory
Filing.  During such  period,  the Company  shall keep ERS  informed as to the
status of such efforts,  shall permit ERS to review and comment on the Initial
Regulatory Filing during its preparation, and shall consult with ERS regarding
the preparation of the Initial Regulatory Filing.

          (b) Promptly after the Effective  Date, the Company shall deliver to
ERS copies of all  relevant  and  material  data,  studies  and other  written
materials in the Company's possession as of the Effective Date relating to the
Compounds and Products,  including any such materials  relating to Patents and
Know-How.

          (c) During the term of this Agreement:  (i) each Party shall provide
to the other  Parties any material data or other  information  relating to the
Compounds and Products, including any such information relating to Patents and
Know-How,  from  time to time as such data and  information  is  developed  or
acquired by such  Party;  and (ii) each of the  Parties  shall  deliver to the
other  Parties all data and dossiers  relating to the Compounds or any Product
and results from any studies being conducted by or on behalf of either of such
Parties in  connection  therewith  promptly  after such data  and/or  dossiers
become available.

          (d) All such  data  and  information  exchanged  or  required  to be
exchanged  by the Parties  pursuant to this  Section 4.1 shall be owned by the
Company,  whether in the  Company's  possession or control as of the Effective
Date or developed by any Party during the term of this Agreement.  The Company
hereby grants BMS and ERS the right to use all such data and  information  for
all  purposes  necessary  to  allow  BMS and  ERS to  perform  each  of  their
obligations under this Agreement.

     4.2 Product  Registrations.  Except as otherwise  mutually  agreed by the
Company and BMS, the Company  shall own all  Registrations  in each country in
the Territory.


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Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


     4.3 Scope of Clinical Development Plans and Clinical Budget.

          (a) A clinical  budget  containing the budget for the conduct of the
Clinical  Development  Plans for the development of Compounds and Products for
calendar years 2001 through and including 2017, on a calendar year-by-calendar
year basis,  is attached to this Agreement as Exhibit 4.3(A) (such budget,  as
modified from time to time pursuant to this Agreement, the "Clinical Budget").

          (b) A Summary  Clinical  Development  Plan for  calendar  years 2001
through  2004 is  attached to this  Agreement  as Exhibit  4.3(B).  As soon as
reasonably  possible after the Effective  Date, the PDC shall meet to develop,
finalize  and  approve  the  definitive  clinical  development  plan  for  the
Compounds  and the Products for calendar  years 2001 through 2004 based on the
Summary Clinical  Development Plan for such period. Such Clinical  Development
Plan shall include: (i) a plan for the rapid and orderly transition, after the
BLA Filing Date, of those  clinical and other studies  ongoing with respect to
the  Compounds  and  Products  which are  identified  in the initial  Clinical
Development  Plan as being  transferred to ERS from the Company's sole control
to the control of ERS and the Company,  as determined by the PDC in conformity
with all applicable  regulatory  requirements and consistent with Section 4.1;
(ii) the allocation and transition of regulatory  strategy and  responsibility
for the Products;  (iii) the research and development activities of any or all
of the Parties  under this  Agreement  for the  development  of Compounds  and
Products  for  calendar  years  2001,  2002,  2003  and  2004,  including  the
allocation of resources between the Company and ERS, which shall be consistent
with the Clinical  Budget for such period;  (iv) "go/no go" decision  criteria
for each stage of development of a Product;  (v) target Product profiles;  and
(vi) timelines for scientific,  medical, regulatory and other activities to be
undertaken by the Parties for the purpose of obtaining  Registrations  for the
Products in each country in the  Territory,  providing  marketing  support and
developing new indications and formulations  for the Products.  Every Clinical
Development  Plan for the relevant period shall comprise two  components:  (1)
those  clinical  studies  required  for  approval  of new  indications,  other
labeling changes or for any other purpose under an IND (e.g.,  Phase I through
Phase III  studies  (the  "Registrational  Studies");  and (2)  those  studies
undertaken  post-launch which are not  Registrational  Studies (e.g., Phase IV
studies)  ("Non-Registrational  Studies").  The PDC shall use all commercially
reasonable  efforts to finalize and approve the initial  Clinical  Development
Plan no later than 90 days after the Effective Date.

          (c) Prior to  Registration  in any  country  in the  Territory,  the
Parties intend that the Company will be primarily responsible for implementing
the regulatory strategy for the Products in such country developed by the PDC.
The  Parties  intend that ERS will be  primarily  responsible  for  regulatory
activities in a country in the Territory  after  Registration in such country,
comprising regulatory compliance, worldwide safety surveillance, adverse event
reporting and all other necessary support services.

          (d) At least 12 months  prior to the end of the last  calendar  year
for which a Clinical  Development  Plan has been approved (i.e.,  prior to the
end of 2004, 2008 and 2012, respectively), the PDC shall develop, finalize and
approve a summary clinical development plan for the Compounds and the Products
for the four (or, in the case of the last such period,  five)  calendar  years
next  succeeding  such  calendar  year,  comparable in scope and detail to the
Summary  Clinical  Development  Plan attached as Exhibit 4.3(B) (i.e., for the
period from 2005 through and including  2008, 2009 through and including 2012,
2013  through  and  including  2017)  (each  such  approved  summary  clinical
development plan is a Summary Clinical Development Plan).

          (e) At least six months prior to the end of the last  calendar  year
for which a Clinical  Development  Plan has been approved (i.e.,  prior to the
end of 2004, 2008 and 2012, respectively),


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Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


the PDC shall develop,  finalize and approve a definitive clinical development
plan for the Compounds  and the Products for the four  calendar  years (or, in
the case of the last such period,  five calendar  years) next  succeeding such
calendar year,  containing  the  information  described in Section  4.3(b)(ii)
through (vi) for the relevant  period (i.e.,  for the period from 2005 through
and  including  2008,  2009  through  and  including  2012,  2013  through and
including 2017) based on the Summary Clinical Development Plan for such period
(each  such  approved  definitive  clinical  development  plan  is a  Clinical
Development Plan);  provided,  however, that the Clinical Budget for each such
calendar  year  shall be no less than the  amount  set  forth in the  Clinical
Budget  attached as Exhibit 4.3(A) with respect to such calendar year,  except
that:

               (i) if Net Sales of Products for the calendar year  immediately
preceding  such  calendar  year  are less  than  the [**] for the  immediately
preceding calendar year, but more than the [**] for the immediately  preceding
calendar  year,  then the Clinical  Budget for the  calendar  year in question
shall be no less than an amount  equal to [**] of the  amount set forth in the
initial  Clinical  Budget for the calendar  year in question,  determined on a
[**] based upon the actual [**] for the calendar  year  immediately  preceding
the calendar  year in question and the [**] and [**],  such that if the actual
Net Sales were equal to the Low Case  Projections,  the amount  would be equal
[**] and if [**] were equal to the [**], the amount would be equal to [**] or

               (ii) if Net Sales of Products for the calendar year immediately
preceding  such  calendar  year  are less  than  the [**] for the  immediately
preceding  calendar  year,  then the Clinical  Budget for the calendar year in
question shall be no less than an amount equal to [**] of the amount set forth
in the initial Clinical Budget for the calendar year in question.

          (f) As of the Effective Date, each of the Parties  believes that the
Clinical Budget provides for sufficient funds to complete the execution of the
Clinical  Development  Plans  that  are  to be  developed  by the  Parties  in
accordance  with this  Section  4.3.  ERS shall  provide  sufficient  funds to
complete the  execution of the Clinical  Development  Plans  provided they are
developed  in  accordance  with this  Section 4.3 (even if such  funding is in
excess of the Clinical  Budget).  Any change to any Clinical  Development Plan
after the  development  thereof in  accordance  with this  Section 4.3 must be
approved by the PDC,  provided that any such change that (i) alters the number
of patients  being  studied  under the Clinical  Development  Plan or the type
and/or  phase  of such  studies,  or (ii)  increases  the  amount  of  funding
necessary to complete a Clinical Development Plan as a result of any change to
(A) the timing of entry of such  patients  into  studies  under such  Clinical
Development  Plan, or (B) the  procedures to be conducted in such studies,  in
each such case shall  relieve ERS of the funding  obligation  set forth in the
immediately   preceding   sentence  with  regard  to  such  revised   Clinical
Development  Plan only to the extent that such  revised  Clinical  Development
Plan requires  funding  which  exceeds the Clinical  Budget (after taking into
account any  increase  in the  Clinical  Budget in  accordance  with  Sections
2.1(d)(ii) or (iii)).

     4.4 Transition of Clinical Studies.  As soon as practicable after the BLA
Filing Date,  and consistent  with the transition  plan adopted by the PDC and
contained  in  the  initial  Clinical  Development  Plan,  the  Company  shall
transition  such  clinical  and other  studies  ongoing  with  respect  to the
Products which have been identified in such Clinical Development Plan as being
transferred to ERS in such  transition plan from the Company's sole control to
the control of the  Party(ies) set forth in the initial  Clinical  Development
Plan.  Thereafter,  ERS shall be primarily  responsible  for  performing  such
studies  designated  therefor  in  the  Clinical   Development  Plans  through
completion, and the Company shall be primarily responsible for performing such
studies  designated  therefor  in  the  Clinical   Development  Plans  through
completion.  During the  transition  period,  the Company shall continue to be
involved  in the  ongoing  clinical  studies  in order to  assure  an  orderly
transfer of responsibility.


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Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


     4.5 Conduct of Clinical  Development  Plans.  Under the  auspices of, and
subject  to review  and  approval  by,  the PDC,  the  Parties  shall have the
following responsibilities relating to the conduct of the Clinical Development
Plans:

          (a)  Each  of ERS and  the  Company  shall  be  responsible  for the
preparation of all protocols and the conduct of all Registrational Studies and
Non-Registrational  Studies  for which such Party is  designated  as the Party
responsible  for such studies in the  Clinical  Development  Plans.  Each such
Party shall submit all protocols for Registrational Studies to the PDC and, in
the  case of the  Non-Registrational  Studies,  to the  JCC,  for its or their
approval, as the case may be.

          (b) Each of ERS and the Company shall be  responsible  for preparing
all Regulatory Applications necessary or desirable to register the Products in
all countries in the Territory for which such Party is designated as the Party
responsible  for such  preparation  in the  Clinical  Development  Plans.  The
Company shall be responsible for filing all Regulatory  Applications  (whether
prepared by the Company or ERS) and, thereafter, to conduct all communications
with the Regulatory  Authorities  during the  registration  process  (provided
that, if ERS is the  responsible  Party for the preparation of such Regulatory
Application, it will work with the Company with respect to all such regulatory
activities).  Each such Party shall submit all proposed filings to the PDC for
its  approval.  The other such Party  shall  provide  all  technical  data and
support  necessary to assist the responsible  Party to prepare such Regulatory
Applications.  The  responsible  Party  shall keep the PDC  informed as to the
status of such efforts,  permit the PDC to review any revisions to any filings
or communications  with Regulatory  Authorities during their preparation,  and
shall  confer  with the PDC  regarding  the  preparation  of such  filings and
communications and the registration process. During such process, such Parties
shall collaborate and cooperate in the preparation and filing of all documents
necessary  therefor  and  all  regulatory  interactions  and  compliance  with
Regulatory Authorities in the Territory.  All regulatory activities (including
without  limitation  adverse  event  reporting)  to be  performed  by  ERS  in
accordance  with this  Agreement and the Clinical  Development  Plans shall be
conducted on behalf of the Company. The Company shall appoint ERS as its agent
for regulatory compliance and all other regulatory activities for which ERS is
responsible.

          (c) The Company shall supply all API necessary  and/or desirable for
all  studies to be  conducted  pursuant  to the  Clinical  Development  Plans,
including,    without    limitation    all    Registrational    Studies    and
Non-Registrational  Studies. Such API shall be supplied in accordance with, in
all material  respects,  the  Specifications,  in accordance with cGMP, and in
accordance with forecasts therefor provided by the PDC at least 180 days prior
to the anticipated delivery date for each shipment thereof.  Such API shall be
supplied at the Company's  Fully  Burdened  Manufacturing  Cost. The Company's
obligation  to supply API for  Non-Registrational  Studies  shall be  subject,
first, to fulfilling all  requirements  for API for the supply of Products for
commercial  sales pursuant to Section 8. Except as otherwise  provided in this
Section 4.5(c),  all of the provisions of Section 8, to the extent applicable,
shall apply to the supply of API for all such clinical studies  (including the
reference to the relevant payment terms contained in Section 7).

          (d) In connection with  performing its  obligations  pursuant to the
Clinical  Development  Plans,  each  of ERS  and  the  Company  shall  use all
commercially  reasonable efforts to perform such responsibilities  diligently,
with the  objective  of  maximizing  the sales  potential  of the Products and
promoting  the  therapeutic  profile and  benefits of the Products in the most
commercially  beneficial  manner.  Without  limiting  the  generality  of  the
foregoing, each such Party shall:

               (i)  cooperate  with the other Party to implement  the Clinical
Development  Plans, and such other activities that, from time to time, the PDC
decides are necessary for the commercial success of the Products;


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Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


               (ii) use  commercially  reasonable  efforts to perform the work
set out for such Party to perform in the Clinical Development Plans;

               (iii)  conduct all work  pursuant to the  Clinical  Development
Plans in good scientific  manner,  and in compliance in all material  respects
with all requirements of applicable laws, rules and regulations, and all other
requirements of any applicable cGMP, good laboratory practice and current good
clinical  practice  to attempt  to  achieve  the  objectives  of the  Clinical
Development Plans efficiently and expeditiously; and

               (iv)  maintain  records,  in  sufficient  detail  and  in  good
scientific  manner,  which shall be complete  and accurate and shall fully and
properly  reflect all work done and results  achieved in  connection  with the
Clinical  Development Plans in the form required under all applicable laws and
regulations. The other such Party shall have the right, during normal business
hours and upon reasonable  prior written notice,  to inspect and copy all such
records  at  its  own  expense,  so  long  as  doing  so is  not  unreasonably
disruptive.  The other such Party shall maintain such records and  information
contained  therein in confidence  in accordance  with Section 10 and shall not
use such records or information  except to the extent  otherwise  permitted by
this Agreement.

     4.6 Funding of Clinical Development Plans.

          (a) From and after the Effective  Date,  each of the Company and ERS
shall be responsible  for the  Development  Costs listed below its name in the
following table:

-------  ----------------------------------- -----------------------------------
                The Company                            ERS
-------  ----------------------------------- -----------------------------------

North    50% of the Development Costs for    50% of the Development Costs for
America  the Non-Registrational Studies.     the Non-Registrational Studies, and

                                             100% of the Development Costs for
                                             the Registrational Studies.
-------  ----------------------------------- -----------------------------------

Japan    50% of the Development Costs for    50% of the Development Costs for
         each of the Registrational Studies  each of the Registrational Studies
         and the Non-Registrational Studies. and the Non-Registrational Studies.
-------  ----------------------------------- -----------------------------------

     4.7 IT Support.  From and after the  Effective  Date,  ERS shall  provide
software  and  technical  assistance  to  the  Company  which  are  reasonably
necessary  to enable  the  Company  to  fulfill  its  obligations  under  this
Agreement by allowing the Company's  information  systems to  communicate  and
exchange  data with ERS's and BMS's  information  systems to a degree and in a
manner  mutually  agreed upon by the  Parties.  Such  software  and  technical
assistance will enable secure  information flow among the Parties with respect
to clinical, regulatory, manufacturing, marketing and sales information. It is
understood  that such  software  and  technical  assistance  shall not include
providing any hardware  necessary  for the Company to permit such  information
flow or incurring the costs  associated with such hardware by ERS. ERS and BMS
shall be responsible for all costs they incur in connection with providing the
foregoing  software  and  technical  assistance  to the  Company,  which


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Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


shall include, without limitation, ERS's and BMS's internal costs of providing
information  technology  personnel  to provide  such  software  and  technical
assistance and all applicable allocable overhead. Each of the Parties shall be
responsible for their respective internal information  technology  maintenance
costs  associated  with or arising from the  foregoing,  which shall  include,
without limitation,  each such Party's internal costs of providing information
technology  personnel to provide such maintenance and all applicable allocable
overhead.  This  Section 4.7 is not  intended to address  software or hardware
upgrades  unilaterally  undertaken by the Company  without ERS's consent after
the foregoing  communication  and data exchange systems have been established.
In the  event  that  the  Parties  cannot  agree  with  respect  to any of the
foregoing,  such  matter  shall be  referred  to the  relevant  Committee  for
resolution.

     4.8 Delay of Initial Regulatory Filing. In the event that Registration of
the Initial  Regulatory Filing is denied or is materially  delayed by the FDA,
then  the  PDC  shall  (a)  immediately  meet  to  discuss  in  good  faith  a
reassessment of the relevant  Clinical  Development  Plan to address the FDA's
objections  and  questions,  (b)  immediately  give  the  JEC  notice  of such
developments,  (c) from time to time as additional  such  developments  arise,
promptly give the JEC notice of such additional developments, and (d) keep the
JEC  reasonably  informed  of  the  PDC's  deliberations  regarding  all  such
developments. As used in this Section 4.8, a material delay is a delay arising
from a requirement  set forth by the FDA that the Company  conduct  additional
clinical  studies not  conducted  in  connection  with the  submission  of the
Initial  Regulatory  Filing.  In the event of a material delay,  the PDC shall
apply  its sound  scientific,  commercial  and  regulatory  judgment  with all
deliberate  speed to  determine  whether or not it is in the best  interest of
both of ERS and the Company to go forward  with the conduct of any  additional
clinical  studies required by the FDA. Upon reaching such  determination,  the
PDC shall make a formal recommendation of its conclusions to the JEC and shall
await direction from the JEC regarding  what, if any,  further action is to be
taken with respect to such matters.  Upon receiving the approval of the JEC to
undertake the additional  clinical  studies required by the FDA, the PDC shall
be authorized to, and is hereby directed to, redirect (without increasing) the
existing overall Clinical Budget as necessary to undertake such studies and to
cause such studies to be undertaken.

     4.9 Suspension of Clinical Development  Activities.  Any Party shall have
the right to immediately suspend the relevant clinical development  activities
with respect to a Product or Compound for a particular indication, formulation
or dosage form in the event that such Party,  in good faith,  determines  that
there exists  significant and urgent concerns  relating to patient safety with
respect  to such  clinical  studies.  The Party  making the  determination  to
suspend such  clinical  activities  shall notify the other  Parties in writing
immediately  of any such  suspension and the reasons  therefor.  The PDC shall
then  promptly  determine  what  actions  should be taken with respect to such
clinical  activities.  Once a determination is made by the PDC with respect to
the appropriate  actions to be taken, the PDC shall review and re-evaluate the
relevant  Clinical  Development  Plan  and the  Clinical  Budget  and make any
changes necessary to implement such actions.

     4.10 Liability.  Each Party shall be responsible for, and hereby assumes,
any and all risks of personal  injury or property  damage  attributable to the
negligent or willful acts or  omissions of such Party or its  Affiliates,  and
their  respective  directors,  officers,  employees  and  agents  and  for the
Registrational  Studies and the  Non-Registrational  Studies that the Party is
responsible  for  conducting  and the  other  responsibilities  of such  Party
pursuant to this Section 4.


                                      27





Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


5. DISTRIBUTION AND PROMOTION.

     5.1  Generally.  ERS shall use all  commercially  reasonable  efforts  to
launch,  promote  and sell  the  Products  in each  country  in the  Territory
(without regard to other products of BMS and its  Subsidiaries) and to perform
such responsibilities  diligently,  with the objective of maximizing the sales
potential of the Products and promoting the  therapeutic  profile and benefits
of the Products in the most commercially beneficial manner.

     5.2 Scope of Marketing Budget.

          (a) The Marketing  Budget for the marketing and sales of Products in
each country in the Territory for calendar years 2001 through 2004 is attached
to this Agreement as Exhibit 5.2(A).

          (b) The Indicative  Marketing  Budget for the marketing and sales of
Products in each country in the Territory for calendar  years 2005 through and
including 2017 is attached to this Agreement as Exhibit 5.2(B).

          (c) At least 12 months  prior to the end of the last  calendar  year
for which a  Marketing  Budget has been  approved  (i.e.,  prior to the end of
2004,  2008 and 2012,  respectively),  the JCC  shall  develop,  finalize  and
approve a marketing  budget for the Products for the four calendar  years (or,
in the case of the last such period, five calendar years) next succeeding such
calendar year, comparable in scope and detail to the Marketing Budget attached
as Exhibit 5.2(A) (i.e.,  for the period from 2005 through and including 2008,
2009 through and  including  2012,  2013  through and  including  2017),  on a
calendar year-by-calendar year basis (each such approved marketing budget is a
Marketing Budget); provided, however, that such marketing budget for each such
calendar  year shall be no less than the  amount  set forth in the  Indicative
Marketing Budget with respect to such calendar year, except that:

               (i) if Net Sales of Products for the calendar year  immediately
preceding  such  calendar  year  are less  than  the [**] for the  immediately
preceding calendar year, but more than the [**] for the immediately  preceding
calendar  year,  then the  Marketing  Budget for the calendar year in question
shall be no less than an amount  equal to [**] of the  amount set forth in the
initial Marketing Budget for the calendar year in question, determined on [**]
based upon [**] for the calendar year immediately  preceding the calendar year
in  question  and the [**] and [**],  such that if the  actual  Net Sales were
equal to the [**],  the  amount  would be equal to [**] and if the  actual Net
Sales were equal to the [**], the amount would be equal to [**]; or

               (ii) if Net Sales of Products for the calendar year immediately
preceding  such  calendar  year are less  [**] for the  immediately  preceding
calendar  year,  then the  Marketing  Budget for the calendar year in question
shall be no less than an amount  equal to [**] of the  amount set forth in the
initial Marketing Budget for the calendar year in question.

     5.3 ERS Responsibilities; Rights.

          (a) Except as  provided  in Section  5.5 and  subject to the overall
direction and control of the JCC, ERS, either itself and/or by and through its
Affiliates  shall be responsible  for, and shall have the rights granted under
Section 3.1.


                                      28





Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


          (b)  In  connection  with  its  responsibilities  for  distribution,
marketing  and sales of the Products in the  Territory,  ERS shall provide all
sales  force  (including,   without  limitation,   sales   administration  and
training),  order entry, customer service,  reimbursement management,  medical
affairs,  medical  information,   marketing  (including  all  advertising  and
promotional  expenditures),  warehousing,  physical  distribution,  invoicing,
credit and collections,  production  forecasting and other related  facilities
and services  necessary  or desirable  for such  distribution,  marketing  and
sales.

     5.4 Marketing  Plans.  In accordance  with the direction  provided by the
JCC, ERS shall prepare  proposed-marketing  and promotional  plans for each of
the Products and for each country in the Territory,  which shall include plans
related to the prelaunch, launch, promotion and sales of the Product and which
shall include but not be limited to pricing strategy, sales targets, forecasts
for the number of sales  representatives,  copies of promotional  materials, a
summary of Phase IV clinical studies and a reasonably  descriptive overview of
the  marketing  and  advertising  campaigns  proposed  to  be  conducted  (the
"Marketing  Plans").  The  Marketing  Plans shall be designed to be consistent
with the Marketing  Budget for such calendar year. ERS shall provide copies of
the  proposed  Marketing  Plans to the  Company for the  Company's  review and
comment as soon as practicable  after  preparation and as frequently as may be
required based upon ERS's usual marketing campaign cycles, but in no case less
that once each calendar year during the term of this  Agreement.  ERS shall in
good faith give due consideration to comments received from the Company on any
such  Marketing  Plan,  and will  provide the Company with a copy of the final
Marketing Plan as soon as it is available.  The Parties intend and expect that
the Marketing  Plan for each calendar year will be finalized no later than the
first day of December of the  immediately  preceding  calendar  year. Any such
final  Marketing  Plan may be reviewed  and revised in  accordance  with ERS's
usual internal  practices,  provided that the Company shall be provided copies
of the  proposed  revisions,  and given the same  opportunity  to comment  and
consideration as provided to the Company for the initial Marketing Plans.

     5.5 Promotional  Materials and Activities.  The Company shall be entitled
to participate (through the JCC) in the planning of promotional  materials and
promotional  activities  with  respect to the Products in the  Territory.  All
promotional  materials and promotional  activities  shall be developed by ERS,
with input from the Company,  following the general guidelines  established by
the JCC and consistent with the then current  Marketing Plan applicable to the
Products being  promoted.  Such activities may include  symposia,  key opinion
leader events,  and similar such events.  Prior to finalizing such promotional
materials  and  promotional  activities,  ERS shall include the Company in its
internal circulation of information  regarding such promotional  materials and
events  during the  development  of such  promotional  materials and any event
related materials and upon the finalization of such materials.

     5.6 The Company's  Co-Promotion  Right. The Company shall have the right,
at its  election and at its sole  expense,  at any time during the term of the
Agreement,  to promote any or all Products in the Territory (the "Co-Promotion
Option").

          (a) In the event that the Company exercises its Co-Promotion Option,
the Company shall be entitled,  at its sole  expense,  to have its sales force
and medical liaison personnel  participate in the promotion of the Products in
the Territory.  In such event, the JCC shall determine the targets,  roles and
assignments  of the  Company's  and ERS's  sales  representatives  within such
selling  effort  in a  manner  generally  consistent  with  the  then  current
Marketing Plan. In order to exercise the Co-Promotion Option, the Company must
give ERS written notice of such exercise at least six months prior to the date
the Company intends to begin its co-promotion activities.

          (b) The Company will be included  in, and be allowed to  participate
in, all  promotional  activities  being  conducted by ERS pursuant to the then
current  Marketing  Plan,


                                      29





Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


including  participation in symposia, key opinion leader events, and the like.
ERS shall provide the Company's sales force with all promotional materials and
support  services  to the same extent  available  to ERS's  sales  force.  The
Company  shall  reimburse  ERS  for  ERS's   incremental  costs  and  expenses
associated  with providing such materials and services to the Company's  sales
force.

          (c) Should the  Company  exercise  its  Co-Promotion  Option,  it is
understood  that ERS will retain the exclusive  rights to sell and  distribute
the Products in North America,  so that the Company's  right and obligation to
promote  would be in the  nature of a  co-promotion  arrangement  in which the
Company promotes such Products, but sales continue to be made by ERS.

          (d) ERS has  provided  the Company a copy of the Code of Conduct for
Sales  Representatives,  Sales  Force  Management  and Others  Promoting  USPG
Pharmaceuticals  dated  December  17,  1998  (the  "Sales  Force  Guidelines")
governing the professional conduct of its sales representatives.  From time to
time when such Sales Force  Guidelines  are to be updated or changed,  ERS (i)
shall provide the Company a reasonable opportunity to comment on such proposed
Sales  Force  Guidelines,  (ii) shall  give  reasonable  consideration  to any
comments made by the Company  regarding such proposed Sales Force  Guidelines,
and (iii) shall provide the final  updated or changed  versions of the same to
the Company upon being finalized. In undertaking its co-promotion  activities,
the Company  shall use its  reasonable  efforts to ensure that its sales force
personnel  abide by all such Sales  Force  Guidelines,  as they are updated or
changed in accordance  with this Section  5.6(d) from time to time,  including
promptly  disciplining  any sales  representatives  violating such Sales Force
Guidelines.  the Company may use the information and/or materials disclosed by
ERS to the Company in connection with such Sales Force Guidelines only for the
purpose of performing  its  co-promotion  activities  in accordance  with this
Agreement.  ERS  shall,  at  all  times,  maintain  ownership  (copyright  and
otherwise) of all  information  and/or  materials  comprising  the Sales Force
Guidelines.

          (e) In the event that ERS  reasonably  believes  the Company has (i)
materially  failed to competently  co-promote the Product(s),  (ii) materially
failed to promote the Product(s) consistent with the direction provided by the
JCC and/or then current  Marketing  Plan,  or (iii)  experienced  a pattern of
violating  any Sales Force  Guidelines,  applicable  laws,  and/or  applicable
regulations in connection with its promotion of the Product(s), where there is
a  reasonable  chance  of  reoccurrence  of one  or  more  of  the  violations
comprising such pattern,  where such violations (to the degree such violations
are not due to the Company's lawful use of promotional  materials  approved by
the JCC),  when taken in the  aggregate,  exceed BMS's and its  Subsidiaries's
collective  history of such  violations in the applicable  time period (each a
"Co-Promotion  Problem"),  then ERS shall  provide  the Company  with  written
notice of such claim  including  specification  of the  respects  in which ERS
believes   such  a   Co-Promotion   Problem  has  occurred   with   reasonable
particularity.  The JCC shall  promptly  meet to  discuss  such  claims and to
determine whether or not such a Co-Promotion Problem has occurred.  If the JCC
does not reach a consensus decision,  then the matter shall be referred to the
JEC for resolution,  provided that Sections  2.1(d)(ii),  (iii) and (iv) shall
not apply with  respect to such  matter.  If the JEC does not reach  consensus
decision on the matter, then ERS may submit the matter to arbitration pursuant
to the Accelerated Arbitration Provisions set forth in Section 16.13(b).

          (f) Upon reaching a  determination  that a Co-Promotion  Problem has
occurred pursuant to Section 5.6(e), the JCC, the JEC, or the arbitrators,  as
the case may be, reaching such  determination must order the suspension of all
of the Company's  rights to co-promote  Products  under this Section 5.6 for a
period of time which  shall  last for a minimum of three  months but shall not
exceed six  months.  Upon the  receipt  of such an order,  the  Company  shall
suspend all activities relating to its co-promotion of Products for the period
of time specified in such order.


                                      30





Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


     5.7 Distribution and Marketing Costs.  From and after the Effective Date,
each of the Company and ERS shall be responsible for those Distribution Costs,
Sales Costs,  Marketing Costs, General and Administrative  Costs, and/or Other
Operating  Income/Expense  listed below its name in the  following  table,  as
applicable in North America and/or Japan:

-------  ----------------------------------- -----------------------------------
                The Company                            ERS
-------  ----------------------------------- -----------------------------------

North    0% of the Distribution  Costs,      100%  of the  Distribution  Costs,
America  Sales Costs and Marketing Costs.    Sales Costs and Marketing Costs.

Japan    50% of the Distribution  Costs,     50%  of  the  Distribution  Costs,
         Sales Costs,  Marketing Costs,      Sales Costs, Marketing  Costs,
         General and Administrative          General and Administrative Costs,
         Costs, and Other Operating          and Other Operating
         Income/Expense.                     Income/Expense.
-------  ----------------------------------- -----------------------------------

6. PAYMENTS.

     6.1 Upfront  Payments to the  Company.  As partial  consideration  to the
Company for the rights granted to ERS under this  Agreement,  ERS shall pay to
the Company a non-refundable, non-creditable up-front payment of $200,000,000,
on the date hereof.

     6.2 Milestone Payments to the Company.

          (a) As further  consideration  to the Company for the rights granted
to ERS  under  this  Agreement,  ERS shall pay to the  Company  the  following
non-refundable and non-creditable milestone payments upon the first occurrence
of each event set forth below with respect to the Products:

----------------------------------------------  -------------------------------
    Milestone Event                                        Milestone Payment
----------------------------------------------  -------------------------------

    Upon the earlier of: (i) the written
    acceptance by the FDA of the complete
    filing with the FDA of a Registration
    Application for a Product, or (ii)
    expiration of the statutory period (60                  $300,000,000
    days) without receipt of a notice of non-
    acceptance from the FDA regarding a
    Registration Application for a Product.

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

    Upon receipt of the written Registration                500,000,000
    for a $500,000,000 Product in the US from
    the FDA.

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


                                      31





Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


          The Party who receives the written acceptance,  or the Registration,
as the case may be,  from the FDA for a milestone  event shall be  responsible
for  promptly  informing  the  other  Parties  when  such  milestone  has been
achieved.  The payments required pursuant to this Section 6.2(a) shall be paid
within 30 days after the  earlier to occur of: (i) ERS  receiving  the written
acceptance,  or the  Registration,  as the  case  may be,  from  the FDA for a
milestone  event, or (ii) the Company  notifying ERS of the achievement of the
relevant milestone.

          (b) In the event that the Company terminates this Agreement pursuant
to clause (i) or (ii) of Section 13.4, all payments made by ERS to the Company
pursuant to Section 6.2(a) shall be refunded by the Company, without interest,
within 30 days after such termination.

     6.3 Distribution Fees for North America. As further  consideration to the
Company for the rights  granted to ERS in North America under this  Agreement,
and subject to Section  6.4, ERS shall pay to the Company a  Distribution  Fee
for North  America equal to the sum of a percentage of annual Net Sales of the
Products in North America as follows:

          (a) 39% of  that  portion  of Net  Sales  in  North  America  in the
relevant calendar year that is less than or equal to [**];

          (b)  [**] of that  portion  of Net  Sales in  North  America  in the
relevant  calendar  year that is  greater  than [**] and less than or equal to
[**]; and

          (c)  [**] of that  portion  of Net  Sales in  North  America  in the
relevant calendar year that is greater than [**].

     6.4 Reduction in Distribution Fee for North America.  In the event that a
Third Party Change of Control  Transaction is announced and consummated  prior
to, or announced prior to and consummated  after, the earliest to occur of (i)
the fifth  anniversary of the Effective Date,  (ii) a BMS Dilution Event,  and
(iii) a BMS  Sell-Down;  the  Distribution  Fee for  North  America  shall  be
adjusted, commencing in the calendar month in which such Third Party Change of
Control  Transaction is  consummated,  and continuing  until the expiration or
termination of this Agreement, to be equal to 39% of Net Sales of the Products
in North America.

     6.5 Distribution Fees for Japan. As further  consideration to the Company
for the rights  granted to ERS in Japan under this  Agreement,  the  Company's
Distribution  Fee for  Japan  shall be  equal  to the sum of 50% of  Operating
Profit or Loss from the sale of Products in Japan.  Such amount  shall be paid
to the  Company or credited  to ERS,  as the case may be, in  accordance  with
Section 7.

     6.6  Allocation  of Sales.  ERS shall  allocate  or  reallocate  sales of
Products to Net Sales  received in a specific  calendar month or calendar year
in accordance with ERS's usual and customary sales  allocation  practices that
ERS applies to its other therapeutic oncology products.

7. PAYMENTS AND REPORTS.

     7.1 Payments.  Beginning the Number of Days to Make Payment after the end
of the  calendar  month  in which  the  First  Commercial  Sale is made in the
Territory and for each calendar month  thereafter (no later than the Number of
Days to Make Payment after the end of such calendar month),


                                      32





Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


ERS shall submit a statement, which shall set forth the amount of Net Sales in
North  America  and  Operating  Profit or Loss in  Japan,  Product-by-Product,
during such month,  and the calculation of  Distribution  Fees due on such Net
Sales in North America and on such Operating Profit or Loss in Japan, for such
month. Each such statement shall be accompanied by the payment, if any, due to
the  Company  or shall  indicate  that a credit is being  issued  to ERS.  Any
amounts credited to ERS may, in ERS's sole  discretion,  be set off against to
correspondingly reduce any amount due the Company.

     7.2 Reports.  Beginning with the month in which the First Commercial Sale
is made in the Territory and for each month  thereafter,  (a) ERS shall submit
on the fifth  business  day  following  the  close of such  month  (closed  in
accordance with ERS's then standard  practices),  a net sales report regarding
such  month's  Net Sales in the  United  States;  (b) ERS shall  submit on the
twentieth business day following the close of such month (closed in accordance
with ERS's then standard practices), a net sales report regarding such month's
Net Sales in Canada;  and (c) each of ERS and the Company  shall submit to the
other on the twentieth  business day following the close of such month (closed
in  accordance  with such  Party's own then  standard  practices),  an expense
report separately  detailing,  for such month, such Party's  Development Costs
for Registrational and Non-Registrational Studies in each of North America and
Japan,  and  Operating  Profit  and Loss  detailed  and  broken  down into its
constituent components in accordance with the Financial Appendix. Such reports
are to be  made  in  support  of the  payments  to be  made  pursuant  to this
Agreement and in accordance with the Financial Appendix.  For the avoidance of
doubt, the Parties shall also fulfill any additional  reporting  requirements,
if any, set forth elsewhere in this Agreement.

     7.3 Mode of  Payment.  ERS shall make all  payments  required  under this
Agreement  as  directed  by the  Company  from  time to time in U.S.  Dollars.
Whenever  conversion of payments from any foreign  currency shall be required,
such  conversion  shall  be at the  rate of  exchange  used by ERS for its own
financial  reporting  purposes at such time  without  taking into  account the
effect of any hedging transactions by ERS or its Affiliates.

     7.4 Records Retention.  ERS, the Company and each such Party's respective
Affiliates shall keep complete and accurate records  pertaining to the sale of
Products and the  Product-by-Product and  Product-consolidated  calculation of
Net Sales in North America, Net Sales in Japan and Operating Profit or Loss in
Japan,  including  without  limitation  the  determination  of Fully  Burdened
Manufacturing  Cost  of  API  and  of  Finished  Product,  Development  Costs,
Distribution Costs, Sales Costs,  Marketing Costs,  General and Administrative
Costs and Other Operating  Income/Expense for a period of three calendar years
after the year in which such sales or costs occurred, and in sufficient detail
to permit the Company to confirm the accuracy of each of the  foregoing and of
the aggregate Distribution Fees provided by ERS under this Agreement.

     7.5 Audit Request.  During the term of this Agreement and for a period of
three years thereafter, at the request and expense of any Party (the "Auditing
Party"),  the  Company (in the case of a request by BMS or ERS) or ERS and BMS
(in the case of a request by the  Company),  (the  "Audited  Party"),  and its
Affiliates shall permit an independent,  certified public accountant appointed
by the Auditing  Party and  reasonably  acceptable  to the Audited  Party,  at
reasonable times and upon reasonable  notice but not more often than two times
each  calendar  year, to examine such records as may be necessary to determine
the  correctness  of any report or  payment  made  under  this  Agreement,  to
determine  the  consistency  of  actual   expenditures   versus  the  budgeted
expenditures set forth in the Clinical Budget and/or any Marketing  Budget, as
the  case may be,  or  obtain  information  as to the  determination  of Fully
Burdened Manufacturing Cost of API (including, without limitation, the records
of when during API production API batches failed,  the cost and nature of such
failures),   the  determination  of  Fully  Burdened   Manufacturing  Cost  of
processing API into Finished Product,


                                      33





Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


and the aggregate Net Sales,  Operating Profit or Loss and  Distribution  Fees
payable for any calendar  month,  including  without  limitation,  Development
Costs,   Distribution  Costs,  Sales  Costs,   Marketing  Costs,  General  and
Administrative Costs and Other Operating  Income/Expense.  Results of any such
examination   shall  be  made  available  to  all  Parties  except  that  said
independent,  certified  public  accountant shall verify to the Auditing Party
such amounts and shall disclose no other information revealed in such audit.

     7.6 Cost of Audit.  The  Auditing  Party  shall bear the full cost of the
performance of any audit requested by the Auditing Party except as hereinafter
set forth.  If, as a result of any  inspection of the books and records of the
Audited Party and/or its Affiliates,  it is shown that payments made by ERS to
the Company under this  Agreement  were less than the amount which should have
been paid,  then ERS shall make all payments  required to be made to eliminate
any discrepancy revealed by said inspection within 30 days after the Company's
demand therefor.  Furthermore,  if the payments made were less than 95% of the
amount that should  have been paid  during the period in  question,  ERS shall
also reimburse the Company for the reasonable  costs of such audit;  provided,
however,  that no such  reimbursement of such audit costs shall be made in the
event such audit  determines  that,  in the period in  question,  the  Company
misstated  the  financial  data it reported to ERS pursuant to Section 7.1 and
the  Financial  Appendix  by such an  amount  as to cause an  increase  in the
underpayment  by ERS great  enough to trigger the  threshold  set forth above,
without which ERS would be within such threshold.  In the event that the audit
shows that an overpayment has been made by ERS, such amounts shall be deducted
from Distribution Fees owed to the Company.  If such overpayment  amounts have
not been settled by such  deductions  from  Distribution  Fees within one year
from the date  originally  overpaid,  then the Company shall make all payments
required to be made to ERS to eliminate any such overpayment.  Furthermore, if
(i) the  overpayment  made was more than 105% of the amount  that  should have
been paid  during the period in  question  and (ii) the costs  invoiced by the
Company  were  more  than  105% of the  audited  costs  during  the  period in
question,  then the Company shall also reimburse ERS for the reasonable  costs
of such audit;  provided,  however,  that no such  reimbursement of such audit
costs shall be made in the event such audit  determines that, in the period in
question, ERS misstated the financial data it reported to the Company pursuant
to Section  7.1 and the  Financial  Appendix  by such an amount as to cause an
increase in the costs  invoiced by the Company  and/or the  overpayment by ERS
great  enough to trigger the  thresholds  set forth above,  without  which the
Company would be within such thresholds.

     7.7 No Non-Monetary  Consideration  for Sales.  Without the prior written
consent of the Company, ERS and its Affiliates shall not accept or solicit any
non-monetary  consideration  of the  sale  of  the  Products.  Subject  to the
applicable oversight and approval  responsibilities of the PDC and the JCC set
forth  in  Sections  2.3(b)(vii)  and  2.4(b)(vii),  the  use by ERS  and  its
Affiliates of a commercially reasonable amount of the Products for promotional
sampling,  compassionate  use and indigent care shall not violate this Section
7.7.

     7.8 Taxes.  In the event that ERS is required to withhold  any tax to the
tax or revenue  authorities  in any  country in the  Territory  regarding  any
payment to the Company due to the laws of such  country,  such amount shall be
deducted from the payment to be made by ERS, and ERS shall promptly notify the
Company of such  withholding  and,  within a  reasonable  amount of time after
making such deduction,  furnish the Company with copies of any tax certificate
or other  documentation  evidencing  such  withholding.  Each Party  agrees to
cooperate with the other Parties in claiming  exemptions  from such deductions
or withholdings under any agreement or treaty from time to time in effect.


                                      34





Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


8. MANUFACTURE AND SUPPLY.

     8.1 Supply Obligations.  Under the auspices of, and subject to review and
approval  by, the JMC,  and except as mutually  agreed by ERS and the Company,
the  Parties  shall  have  the  following  responsibilities  relating  to  the
manufacture and supply of API and Finished Products:

          (a) Commencing on the Effective Date, and thereafter during the term
of this Agreement,  the Company (or its  Affiliates)  shall be responsible for
the  manufacture  or  supply  of all  requirements  of API  for  clinical  and
commercial use in the Territory pursuant to this Agreement.

          (b) Prior to  expiration,  termination  or  assignment  (pursuant to
Section 8.9) of any existing  agreement  between the Company and a Third Party
Manufacturer  for the manufacture of Finished  Products,  the Company shall be
the Party  responsible for processing the API into Finished  Products pursuant
to such agreement.  Commencing upon the expiration,  termination or assignment
(pursuant to Section 8.9) of any existing  agreement between the Company and a
Third Party Manufacturer for the manufacture of Finished  Products,  ERS shall
become and thereafter  shall remain the Party  responsible  for processing the
API into Finished Products.

     8.2 Supply of API; Processing of Finished Product.

          (a)  Commencing on the  commercial  launch of Product and thereafter
during the term of this Agreement, subject to the terms and conditions of this
Section 8, the Company shall supply ERS with all of ERS's requirements for API
for commercial use in the Territory pursuant to this Agreement (which shall be
deemed to include all of the requirements of ERS's Affiliates),  and ERS shall
purchase  from the Company all of such  requirements  for API. ERS shall place
orders for the  requirements  of its  Affiliates,  and either have the Company
ship  directly  to  such  Affiliates  or to ERS  for  its  reshipment  to such
Affiliates.

          (b)  Except  to the  extent  that the  Company  is  responsible  for
processing API into Finished Products pursuant to Section 8.1(b),  ERS (or its
Affiliates) shall be responsible for processing the API into Finished Product,
including,  without limitation, all product labeling and other package inserts
and  materials  required  by  the  applicable  Regulatory   Authorities.   The
responsible party shall use commercially reasonable efforts to ensure that all
services, facilities and goods used in connection with such manufacture comply
with the applicable Manufacturing Standards in effect from time to time.

          (c) ERS and the  Company  shall  cooperate  in good  faith and shall
establish  the  Specifications  for this  Agreement.  In  order to  facilitate
manufacture of the API and the Finished Products,  as ERS and the Company deem
appropriate,  such Parties shall cooperate in good faith with Third Parties to
establish  Specifications and Manufacturing  Standards for this Agreement that
conform  to  the  extent  practicable  to  the  specifications  and  standards
applicable to the Company's manufacture of the API and products containing the
API for such Third Parties,  and the Company shall use all reasonable  efforts
to cause such Third Parties to do the same.

          (d) The  Parties  intend that the  Company  will use BMS's  Hopewell
facility  to provide  certain  services  in  connection  with  establishing  a
non-commercial  supply of API.  As soon as  reasonably  practicable  after the
Effective Date, BMS and the Company will negotiate in good faith the Company's
use of BMS's process  development  and  analytical  services at BMS's Hopewell
facility for the support of pre-clinical and clinical  supplies of API for use
in the  development  of  Products,  and the extent to which and terms on which
such services will be made available to the Company.


                                      35





Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


     8.3 Forecasts.  Commencing 12 months prior to the anticipated  commercial
launch of the Product in any country in the Territory,  no later than 180 days
prior to the first day of each calendar quarter ("Q1"),  ERS shall provide the
Company with a  non-binding  (except with respect to Q1),  good faith  rolling
forecast  of  estimated  quantities  in  kilograms  and  anticipated  delivery
schedules for API for the  following  12-month  period (i.e.,  Q1 and the next
three  calendar  quarters  ("Q2," "Q3" and "Q4,"  respectively)),  by calendar
quarters.  The quantity  indicated for Q1 shall be considered a firm order, in
accordance  with  Section  8.4.  Such  forecasts  shall be revised and updated
quarterly, including firm orders for the next succeeding quarter.

     8.4 Orders for API.

          (a) Together  with each  forecast  provided  under  Section 8.3 (the
"Current Forecast"),  ERS shall place its firm order on a quarterly basis with
the Company, setting forth kilograms, delivery dates and shipping instructions
with  respect to each  shipment of API for  delivery in Q1. The Company  shall
accept such orders from ERS, subject to the other terms and conditions of this
Agreement,  to the extent such  quantity of API is: (i) no more than the least
of: (A) the quantity  thereof  reflected  in the Current  Forecast for Q1; (B)
110% of the  quantity  thereof  reflected  for Q2 in the  forecast  that  next
preceded the Current Forecast;  and (C) 125% of the quantity thereof reflected
for Q3 in the forecast that next  preceded the forecast  referred to in clause
(i)(B);  and (ii) no less  than the  greatest  of:  (A) the  quantity  thereof
reflected  in the Current  Forecast  for Q1; (B) 90% of the  quantity  thereof
reflected for Q2 in the forecast that next preceded the Current Forecast;  and
(C) 75% of the quantity  thereof  reflected  for Q3 in the forecast  that next
preceded the  forecast  referred to in clause  (ii)(B).  ERS's orders shall be
made pursuant to purchase  orders which are in a form  mutually  acceptable to
the ERS and the Company, to the extent that such form is not inconsistent with
the terms of this Agreement.

          (b) The Company  shall not be obligated  to accept  orders for Q1 to
the extent the quantity of API ordered exceeds the foregoing limitations,  but
shall use good faith  efforts to fill such orders for such  excess  quantities
from  available  supplies.  In the event that the Company,  despite the use of
good faith  efforts,  is unable to supply such excess  quantities to ERS, such
inability to supply shall not constitute a breach of the Company's obligations
under  this  Section  8 or a  Short-Term  Inability  to  Supply  or  Long-Term
Inability to Supply.  The Company shall use all  reasonable  efforts to notify
ERS within ten days after receipt of an order of the Company's ability to fill
any  amounts of such  orders in excess of the  quantities  that the Company is
obligated  to supply.  ERS shall  notify the Company as soon as possible of an
increase in ERS's  requirements for API materially in excess of the limits set
forth in Section 8.4(a).

          (c) In the event that ERS submits orders for API with respect to any
Q1 for less than the minimum  quantity of API that ERS is required to purchase
under this Section 8, the Company  nevertheless shall have the right to supply
and ship to ERS (in accordance  with the shipping  instructions  most recently
supplied by ERS),  and ERS shall have the  obligation  to purchase  and accept
from the Company,  such minimum  quantity of API. ERS shall notify the Company
as soon as  possible of a decrease in ERS's  requirements  for API  materially
below the limits set forth in Section 8.4(a). In the event of such a decrease,
the Company shall use all reasonable  efforts,  but shall not be required,  to
reduce  accordingly  the orders for API that the  Company  has placed with its
Third Party  Manufacturers  or to allocate  to other  purchasers  API that ERS
would have purchased but for such decrease.

     8.5 Delivery. With respect to exact shipping dates, the Company shall use
all reasonable commercial efforts to ship or cause to be shipped quantities of
API that the  Company is  obligated  to supply  pursuant to Section 8.4 on the
dates specified in ERS's purchase orders  submitted and accepted in accordance
with Section 8.4. Notwithstanding any Incoterm that may be specified on


                                      36





Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


ERS's API purchase order,  all API to be delivered  pursuant to this Agreement
shall be delivered in  accordance  with this Section 8.5,  suitably  packed in
bulk containers for shipment, and marked for shipment to the final destination
point  indicated  in ERS's  purchase  order.  The shipping  packaging  used in
connection  with such API  deliveries  shall be in  accordance  with cGMP with
respect  to  protection  of  the  API  during   transportation,   taking  into
consideration  the mode(s) of  transport  ERS has elected to use for each such
shipment,  the final  destination  point of each such shipment and  reasonable
expectations  regarding  shipment time duration and possible delays associated
therewith.  Transportation  of API may be made by rail, road, air, sea, inland
waterway or by a  combination  of such modes of  transport.  The Company  will
deliver or cause to be delivered  all API,  cleared for export (if  applicable
based on the final  destination  point and expected  travel route indicated in
ERS's purchase order),  to the carrier nominated by ERS at a point selected by
the Company.  If such  delivery  occurs at the  Company's  or a Third  Party's
premises, the Company or such Third Party shall be responsible for loading. If
delivery occurs at any other place,  the Company or such Third Party shall not
be responsible  for unloading.  If ERS nominates a Person other than a carrier
to  receive  the API,  the  Company  shall be  deemed  to have  fulfilled  its
obligation to deliver the API when the API is delivered to that Person.  Title
and risk of loss shall  transfer to ERS upon delivery to the carrier or Person
designated by ERS.

     8.6 Purchase Price.

          (a) The  purchase  price for all API  supplied by the Company to ERS
pursuant to this Section 8 for  commercial  use in North  America shall be the
Company's  Fully  Burdened  Manufacturing  Cost for such API plus a mark-up of
10%; provided,  however process development,  process  improvement,  scale-up,
recovery,  and qualification lots costs (although components of Fully Burdened
Manufacturing Cost) shall not be subject to the mark-up of 10%.

          (b) For all API  supplied  by the  Company to ERS  pursuant  to this
Section  8  for  commercial  use  in  Japan,   the  Company's  Fully  Burdened
Manufacturing  Cost for  such API  shall be  included  in the  calculation  of
Operating Profit or Loss, pursuant to the Financial Appendix. Similarly, ERS's
Fully Burdened Manufacturing Cost for the processing API into Finished Product
for commercial use in Japan shall be included in the  calculation of Operating
Profit or Loss, pursuant to the Financial Appendix.

          (c)  For  API  supplied  to ERS for  the  clinical  studies  and for
commercial use in North America,  the Company shall submit invoices to ERS for
API  promptly  after  shipment.  Payments  shall be made by ERS within 60 days
after  ERS's  receipt of the  invoice.  ERS has no  obligation  to pay for any
shipment  of API  that  (i) ERS and the  Company  agree  does  not to meet the
Specifications  and/or  Manufacturing  Standards,  or (ii) in accordance  with
Section  8.8(b),  ERS  has  found  not  to  meet  the  Specifications   and/or
Manufacturing  Standards  while such  findings have not been  contradicted  by
independent  laboratory  testing.  Upon the Company's receipt of a notice from
ERS claiming  that a shipment of API does not meet the  Specifications  and/or
applicable  Manufacturing  Standards,  the time  period  for  payment  of such
shipment  or such batch  shall  toll  until  such time as such  non-conformity
questions  regarding  such  shipment or such batch are resolved in  accordance
with Section 8.8. All relevant  terms of Section 7 with respect to payments of
Distribution  Fees shall apply to the  payment of  invoices  for the supply of
API.

          (d) Once the Company begins  manufacturing  API itself, it shall use
its commercially reasonable efforts to reduce the Fully Burdened Manufacturing
Cost of  manufacturing  API  itself  to an  amount  equal to or less than [**]
before the end of calendar year [**]. The foregoing  sentence shall apply only
to API  for  the  initial  Product,  and  not to any  other  Products  or line
extensions.  If, in order to achieve  the  reduction  referred to in the first
sentence of this Section  8.6(d),  the Company  reasonably  determines that it
must change the cell line and/or  manufacturing  process for the Product,


                                      37





Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


the JMC  shall  approve  such  change  and ERS shall  assume  all costs of any
testing, qualification,  scale-up, regulatory filings, and additional clinical
trials which are reasonably  necessary to support such changes in addition to,
and not as part of, the Development Costs assumed elsewhere in this Agreement.
In the event that the  Company  does not  achieve  the target  Fully  Burdened
Manufacturing Cost set forth in the first sentence of this Section 8.6(d), any
excess of Fully  Burdened  Manufacturing  Cost above such target cost shall be
[**] by ERS and the Company, after the end of calendar year [**].

     8.7 Conformity; Specifications; Quality Control

          (a) All  quantities of API supplied by the Company  pursuant to this
Section 8 will comply in all material  respects  with the  Specifications  and
applicable  Manufacturing  Standards and shall adhere in all material respects
to  all  applicable   governmental  laws  and  regulations   relating  to  the
manufacture,  sale  and  shipment  of each  shipment  of API at the time it is
shipped by the Company hereunder.

          (b) Changes to the Specifications shall be made only by the JMC.

          (c) The Company shall  conduct,  or cause to be  conducted,  quality
control   testing  of  API  prior  to  shipment,   in   accordance   with  the
Specifications  and applicable  Manufacturing  Standards as are in effect from
time to time and such other quality control testing  procedures adopted by the
JMC from time to time  (collectively,  the "Testing  Methods").  Initially and
until decided  otherwise by the JMC, the Testing Methods shall include all FDA
required  release testing and the Company shall undertake all such tests.  The
Company shall retain records pertaining to such testing.  Each shipment of API
hereunder  shall be accompanied by a certified  quality  control  protocol and
certificate  of analysis  for each lot of API therein as well as such  customs
and other documentation as is necessary or appropriate.

          (d)  ERS  shall  have  the  right,  at  reasonable  times  and  upon
reasonable  notice,  to inspect all  facilities  at which API is  manufactured
pursuant  to this  Section 8 for  compliance  with cGMP,  subject to  existing
agreements with Third Party Manufacturers.

          (e) All units of  Finished  Product  manufactured  pursuant  to this
Agreement   will  comply  in  all  material   respects  with  the   applicable
Manufacturing Standards and specifications for Finished Products determined by
the  JMC  and  shall  adhere  in  all  material  respects  to  all  applicable
governmental  laws  and  regulations  relating  to the  manufacture,  sale and
shipment  of  each  Finished  Product  at  the  time  it is  manufactured  and
distributed hereunder.

          (f) The  Party  responsible  for  processing  the API into  Finished
Products  (either  ERS or the  Company  to the  extent  that  the  Company  is
responsible  for  processing  API into Finished  Products  pursuant to Section
8.1(b)) shall conduct,  or cause to be conducted,  quality  control testing of
each Finished  Product prior to shipment,  in accordance  with the  applicable
Manufacturing Standards and specifications for Finished Products determined by
the JMC,  as are in effect  from time to time and such other  quality  control
testing  procedures  adopted by the JMC from time to time.  Such  Party  shall
retain records pertaining to such testing.

     8.8 Acceptance/Rejection; Interim Replacement.

          (a) ERS may test or cause  to be  tested  API  supplied  under  this
Section 8 in accordance with ERS's customary  procedures within 30 days of its
receipt at ERS's plant or that of


                                      38





Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


its designee.  ERS or its designee shall have the right to reject any shipment
of API made to it under this Agreement  that does not meet the  Specifications
and applicable  Manufacturing Standards in any material respects when received
by it at such  destination when tested in accordance with the Testing Methods.
All claims by ERS of non-conforming  API shall be deemed waived unless made by
ERS in writing and received by the Company within such 30-day period.

          (b) All  claims  of  non-conforming  API shall be  accompanied  by a
report of analysis  (including a sample of the API from the batch analyzed) of
the  allegedly  non-conforming  API that  shall  have  been made by ERS or its
designee,  using the Testing Methods. The Company shall promptly undertake its
own  analysis of such sample after  receiving  such claim and report from ERS.
If, after its own analysis,  the Company does not confirm such non-conformity,
the JMC shall agree to retest the shipment or otherwise in good faith  attempt
to agree  upon a  settlement  of the  issue.  In the event that the JMC cannot
resolve the issue,  the JMC shall submit the  disputed  API to an  independent
testing  laboratory,  to be agreed upon by the JMC, for testing in  accordance
with the Testing Methods.  Notwithstanding Section 16.13, the findings of such
laboratory shall be binding on the Parties, absent manifest error. Expenses of
such independent testing shall be borne by either ERS or the Company depending
on which such Party is adversely affected by such findings.  In the event that
any API shipment or batch  thereof is  ultimately  agreed or found not to meet
the  Specifications  and/or applicable  Manufacturing  Standards,  the Company
agrees to replace such shipment or batch with  conforming  API and pay for all
reasonable  out  of  pocket  expenses  incurred  by ERS  and  the  Company  in
connection with shipping  and/or storing such  replacement API and storing the
non-conforming  API.  Such  replacement  shipment of API shall be treated as a
new,  additional  shipment  of API (that will be  separately  invoiced  by the
Company)  for  all  purposes,   including  measuring  its  conformity  to  the
Specifications  and applicable  Manufacturing  Standards and ERS's payment for
such additional  shipment.  ERS shall return any such rejected shipment to the
Company if so instructed  by the Company,  at the  Company's  expense.  In the
event that any API shipment or batch thereof is ultimately  agreed or found to
meet the  Specifications  and applicable  Manufacturing  Standards,  ERS shall
accept and pay for such shipment or batch in accordance with Section 8.6(c).

          (c) Within 30 business days following December 31st of each calendar
year after the first  shipment of API by the Company in the Territory (or upon
such other times agreed to by the Finance  Committee),  the Finance  Committee
shall undertake a series of  calculations to determine the amount,  if any, of
overpayment by ERS to the Company of Fully Burdened Manufacturing Cost for API
during the preceding calendar year, as follows:

               (i) The  Finance  Committee  shall  review  and  determine  the
following  information  regarding the previous  calendar year's  production of
API:

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

     Total Number of All Batches = total number of all (including  successful,
     failed  and  non-conforming  batches)  API  batches  manufactured  by the
     Company or attempted to be manufactured by the Company

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

     Total  Number  of  Failed  Batches  =  total  number  of  all  failed  or
     non-conforming API batches manufactured by the Company or attempted to be
     manufactured by the Company

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

     Total Cost of Failed Batches = total cost of all failed or non-conforming
     API
     --------------------------------------------------------------------------


                                      39





Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


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

     batches  manufactured  by the Company or attempted to be  manufactured by
     the Company (as such are reported as part of Fully Burdened Manufacturing
     Cost for API during such calendar year)

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

               (ii)  The  Finance  Committee  shall  undertake  the  following
calculations:

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

     Average  Cost Per  Failed  Batch = Total  Cost of Failed  Batches / Total
     Number of Failed Batches

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

     Allowable  Number of  Failures = Total  Number of All Batches x Allowable
     Failure Rate applicable to the calendar year under review

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

     Number  of Excess  Failed  Batches  = Total  Number  of Failed  Batches -
     Allowable Number of Failures

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

               (iii) If the Number of Excess  Failed  Batches is greater  than
zero, then the Finance Committee shall undertake the following calculation:

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

     Amount of  Overpayment = Average Cost Per Failed Batch x Number of Excess
     Failed Batches

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

If the Number of Excess Failed Batches is greater than zero, the Company shall
reimburse ERS for the Amount of  Overpayment  within 3 business days after the
completion  of the  calculation  of such amount.  Prior to receiving  any such
payment,  ERS may elect to credit any such amount due against any payment owed
to the Company under this Agreement. For purposes of such determinations,  the
"Allowable  Failure Rate" for the  manufacture  of API, in the  aggregate,  in
calendar  years 2001 and 2002 shall be [**]; in calendar  years 2003 and 2004,
the "Allowable  Failure Rate" for the manufacture of API shall be [**]; and in
calendar  year  2005 and in all  subsequent  calendar  years,  the  "Allowable
Failure  Rate"  for the  manufacture  of API  shall be [**].  In the event the
Finance  Committee  does not agree on the Amount of  Overpayment,  such matter
shall be referred to the JEC for resolution.

          (d) Upon the  Company's  receipt of a claim that a shipment or batch
thereof   of  API  does  not  meet  the   Specifications   and/or   applicable
Manufacturing Standards, the Company shall use commercially reasonable efforts
to replace such shipment or batch  thereof with an additional  shipment of API
that does conform to such standards as soon as practicable.

     8.9 Third Party Manufacturers. The Parties acknowledge and agree that the
Company  currently  obtains  Finished  Products  through  written  contractual
arrangements with Third Party  Manufacturers.  Upon the execution and delivery
of this Agreement,  the Company shall use


                                      40





Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


commercially  reasonable  efforts to assign all such written contracts to ERS,
and upon such  assignment,  the Company  shall and hereby does  represent  and
warrant that, as of the Effective  Date, to the knowledge of the Company it is
not in breach under any such contracts and that data and information  provided
to ERS by the Company  relating to such  contracts is accurate and complete in
all material respects and contains no material errors or omissions.  If any of
such  contracts  are not assigned  (after the  Company's  use of  commercially
reasonable efforts to secure their assignment under such contracts),  ERS will
reimburse  the Company for the cost of  producing  Finished  Product.  The JMC
shall prepare a strategy and transition plan for  transitioning the production
of Finished  Products from such Third Party  Manufacturers to ERS, which shall
provide  for a  reasonably  sufficient  amount  of time  for ERS to be able to
manufacture all of its  requirements of Finished  Products.  The JMC may, from
time to time,  determine that the Company may use Third Party Manufacturers to
supply  all or some of the API it is  required  to supply  to ERS  under  this
Agreement.

     8.10  Inventory  Management  ERS shall  maintain  inventory  of  Finished
Product  and API in  accordance  with  ERS's  usual  and  customary  inventory
management  practices  that ERS  applies  to its  other  therapeutic  oncology
products.

     8.11 Shortage of Supply.

          (a) The Company  shall notify ERS: (i) as promptly as possible,  but
in no event  more than ten days  after the  Company's  receipt of a firm order
from ERS as provided in Section 8.4, or (ii)  immediately  upon becoming aware
that the  Company  is  unable to supply  the  quantity  of API to ERS that the
Company is  required to supply  hereunder,  if the Company is unable to supply
such  quantities  of API.  In such  event,  the Company  shall  implement  all
commercially reasonable efforts to remedy such shortage, including through the
use of Third Party  Manufacturers  for all or a portion of such  quantities of
API, as determined are necessary by the JMC.

          (b) In the event  that the  Company  is unable to supply  both ERS's
requirements of API and the Company's and Third Parties'  requirements for the
API due to force majeure or otherwise, the Company shall allocate the API that
the Company has in inventory and that the Company is able to produce among the
quantities  of all such  requirements,  so that  ERS  receives  at  least  its
proportionate share of such available supplies,  as determined from reasonable
forecasts (taking into consideration past sales and sales performance  against
forecast) and orders, for the API.

     8.12 Inability to Supply.

          (a) In the event of any Short-Term  Inability to Supply or Long-Term
Inability  to  Supply,  ERS shall be  entitled  in  proportion  to the  supply
shortfall  to  delay  the  incurrence  of the  Development  Costs  and/or  the
Distribution  Costs,  Sales  Costs  and/or  Marketing  Costs for the  relevant
period,  until such Short-Term  Inability to Supply or Long-Term  Inability to
Supply ends. The Clinical Budget and/or the relevant Marketing Budget shall be
adjusted accordingly. Any issues relating to the application of this provision
shall be subject to review by the relevant  Committee,  and any  resolution of
such matters shall require a consensus decision by such Committee, not subject
to the tie-break mechanisms of the relevant Sections of this Agreement.

          (b) An  "Inability  to Supply"  shall mean:  (i) with respect to the
supply of API for Registrational  Studies or  Non-Registrational  Studies, the
Company's failure for any reason,  including without  limitation force majeure
reasons  or  otherwise,  to supply  ERS with  quantities  of API  meeting  the
Specifications  and  Manufacturing  Standards  equal to at  least  [**] of the
quantity of API set forth in the applicable time period on Exhibit 8.12(B)(i);
and (ii) with respect to the supply of API for commercial sales, the Company's
failure for any reason,  including without limitation force majeure reasons or
otherwise, to supply ERS with quantities of API meeting the Specifications and


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Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


Manufacturing  Standards  equal to at least  [**] of the  quantity  of API set
forth in the applicable time period on Exhibit 8.12(B)(ii).

          (c) A  "Short-Term  Inability  to Supply" is an  Inability to Supply
that is reasonably expected to continue for no more than a six-month period of
time.

          (d) A "Long-Term  Inability to Supply"  shall mean any  Inability to
Supply that is reasonably  expected to exceed or actually  exceeds a six-month
period of time.

          (e) In the event that ERS believes that any  Long-Term  Inability to
Supply exists, ERS shall provide the Company with written notice of such claim
and the JMC shall  promptly  meet to  discuss  such  claims  and to  determine
whether the alleged Long-Term Inability to Supply exists and whether it is due
solely  to a force  majeure  event.  If the JMC  does  not  reach a  consensus
decision in its deliberations  regarding such claims, then the matter shall be
referred to the JEC for resolution,  provided that Sections 2.1(d)(ii),  (iii)
and (iv) shall not apply  with  respect  to such  matter.  If the JEC does not
reach  consensus  decision  on the  matter,  then ERS may submit the matter to
arbitration  pursuant to the Accelerated  Arbitration  Provisions set forth in
Section 16.13(b). The Parties shall reasonably and promptly cooperate with the
JMC,  JEC,  and  arbitrators,  as the case may be,  during  their  proceedings
regarding such claims.

          (f) If a determination is made pursuant to Section  8.12(e),  by the
JMC,  the  JEC,  or the  arbitrators,  as the case  may be,  that a  Long-Term
Inability to Supply exists, the JEC shall re-evaluate the Clinical Development
Plans,  Marketing Plans,  Clinical Budget and/or the Marketing Budgets in view
of such Long-Term  Inability to Supply. If a determination is made pursuant to
Section 8.12(e), by the JMC, the JEC, or the arbitrators,  as the case may be,
that a Long-Term  Inability to Supply  exists and is not due solely to a force
majeure event,  then:  (i) for so long as such  Long-Term  Inability to Supply
continues,  the JMC  shall be  co-chaired  by  representatives  of ERS and the
Company  and  matters  that are the  subject of a deadlock  arising in the JMC
shall be resolved in accordance with the Accelerated Arbitration Provisions of
Section  16.13(b);  (ii) the Company shall  reasonably  cooperate  with ERS to
establish an alternative  supply,  including  locating  qualified  third party
manufacturers  and  sources of  materials;  and (iii) the JMC shall  (with the
understanding  that  the  goal  of the  Parties  shall  be to  transition  the
manufacture and supply of API back to the Company as soon as  practicable,  to
the extent that such Long-Term  Inability to Supply ceases to exist) authorize
the taking of one or more the following  actions to make up for the API supply
shortfall, in the order of preference listed below, and with the understanding
that performance of API supply obligations and responsibilities  under each of
the actions  listed  below shall be  reasonably  consistent  with the scope of
performance  of  such  obligations  and  responsibilities  contemplated  to be
performed by the Company as the primary source of API supply:

          first, make use of the internal capacity of BMS and/or ERS
          to fill the API supply shortfall;


          second,  contract with a third party  manufacturer to fill
          the API supply shortfall; and


          third,  take such other  actions as may be  necessary  for
          purposes of filling the API supply shortfall.

          (g) The Company shall reimburse ERS for all reasonable out-of-pocket
costs  incurred in  connection  with  making up for a shortfall  in API supply
pursuant to Section 8.12(f);  provided,


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Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


however that such reimbursable costs shall not include the costs of purchasing
API from a third party  manufacturer  or the costs of purchasing any component
used  to  manufacture   API  for  purposes  of   calculating   Fully  Burdened
Manufacturing  Cost as defined in Exhibit  1.35 (as applied to ERS) other than
those directly relating to the startup of biologic  operation for the Product,
including any  efficiency,  activity and spending  variances from standards as
well as any  underabsorbed  overhead  expenses  incurred  during such startup,
including, without limitation,  capital investments undertaken by ERS that are
authorized by the JMC which relate to ERS's use, dedication, expansion, and/or
creation  of ERS's  internal  capability  to  supply  API.  The  rights of ERS
pursuant to this Section 8.12 shall not be affected in any way by ERS's waiver
or failure to take action with respect to any previous failure by the Company.
Any rights  provided to ERS pursuant to this  Section  shall be in addition to
any other rights or remedies available to ERS at law or in equity.

          (h) If a determination is made pursuant to Section  8.12(e),  by the
JMC,  the  JEC,  or the  arbitrators,  as the case  may be,  that a  Long-Term
Inability to Supply  exists and is due solely to a force majeure  event,  then
the JMC shall meet to  determine  how to rectify such  Long-Term  Inability to
Supply. If the JMC does not reach a consensus decision,  then the matter shall
be referred to the JEC for  resolution,  provided  that  Sections  2.1(d)(ii),
(iii) and (iv) shall not apply with  respect to such  matter.  If the JEC does
not reach  consensus  decision  on the  matter,  then any Party may submit the
matter to arbitration pursuant to the Accelerated  Arbitration  Provisions set
forth in Section 16.13(b). The Parties shall reasonably and promptly cooperate
with  the  JMC,  JEC,  and  arbitrators,  as the  case  may be,  during  their
proceedings regarding such Long-Term Inability to Supply.

          (i) In the event that ERS or a third party manufacturer is to supply
API in accordance with Section 8.12(f), the Company shall fully cooperate with
ERS or such third party manufacturer, as the case may be, and take all actions
necessary  to  qualify  them  as a  manufacturer  of API,  including,  without
limitation:  (i) providing  them with copies of all  documentation  within the
Company's  possession  and control that is  reasonably  necessary  for them to
manufacture  API; (ii) providing  such  technical  assistance as is reasonably
necessary  to  enable  them  to  manufacture   API  in  accordance   with  the
Specifications and the applicable  Manufacturing  Standards;  and (iii) to the
extent that ERS or a third party manufacturer supplies API pursuant to Section
8.12(f),  ERS shall be relieved of its obligation to purchase from the Company
such quantities of API.

9. OWNERSHIP; PATENTS; TRADEMARKS.

     9.1 Ownership.  All  Inventions  developed by any Party or jointly by the
Company, ERS, and/or BMS shall be owned by the Company,  except for Inventions
developed  solely by ERS and/or BMS which have general  utility in  connection
with other  products  and/or  compounds  in addition to the  Compounds  and/or
Products,  in which case ERS shall own such Inventions ("ERS Inventions").  To
the extent  necessary to effectuate the  foregoing,  ERS shall take any action
reasonably  necessary to effectuate  the Company's  ownership  pursuant to the
foregoing.  The Company shall have all right, title and interest in and to the
Patents, Know-How, and Trademarks,  whether in existence on the Effective Date
or developed during the term of this Agreement,  subject to the rights granted
to ERS and BMS pursuant to this Agreement.

     9.2 Maintenance of the Patents.

          (a) The  Company  shall  have  full  responsibility  for,  and shall
control the preparation and  prosecution of, all patent  applications  and the
maintenance of all patents relating to the Technology  (including the Patents)
throughout the Territory. In connection therewith, the Company shall generally
consult  with ERS on all future  filings  with  respect to the Patents and the
prosecution


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Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


and  maintenance of such Patents,  including  where  appropriate or reasonably
requested  by ERS,  providing  copies to ERS of any such  filings made to, and
written communications  received from, any patent office relating, in whole or
in part,  to the  Patents.  The  Company  shall pay all costs and  expenses of
filing,  prosecuting  and  maintaining  the Patents  and the patents  covering
Inventions  arising from the  Technology.  ERS shall have full  responsibility
for,  and shall  control  the  preparation  and  prosecution  of,  all  patent
applications  and the  maintenance  of all patents  relating to ERS Inventions
throughout the Territory. In connection therewith, ERS shall generally consult
with the Company on all future  filings  with  respect to such patents and the
prosecution  and maintenance of such patents,  including where  appropriate or
reasonably  requested by the Company,  providing  copies to the Company of any
such filings made to, and written  communications  received  from,  any patent
office relating, in whole or in part, to such patents. ERS shall pay all costs
and  expenses of filing,  prosecuting  and  maintaining  patents  covering ERS
Inventions.  Notwithstanding  the  foregoing,  the Company  shall not have the
right to file  patent  applications  or maintain  patents for ERS  Inventions,
regardless of whether such ERS  Inventions  relate to the  Technology.  Upon a
determination  by the PDC that a patent  application  should  be filed  for an
Invention  relating to a Product  that the PDC intends to  commercialize  in a
particular  country,  the Company  shall,  at it sole cost and  expense,  file
patent applications for such Invention in such country.

          (b) Each Party agrees to cooperate with the other Parties to execute
all lawful papers and instruments, to make all rightful oaths and declarations
and  to  provide  consultation  and  assistance  as may  be  necessary  in the
preparation,  prosecution, maintenance and enforcement of all such patents and
patent applications pursuant to this Agreement.

9.3 Patent Enforcement.

          (a)  If any  Party  learns  of an  infringement,  unauthorized  use,
misappropriation  or ownership claim or threatened  infringement or other such
claim (any of the foregoing,  an "infringement") by a Third Party with respect
to any  Technology or any  Trademark  within the  Territory,  such Party shall
promptly  notify the other  Parties and shall  provide such other Parties with
available evidence of such infringement.

          (b) The Company  shall have the first  right,  but not the duty,  to
institute patent or trademark infringement actions against Third Parties based
on any  Technology  or  Trademark  in the  Territory.  If the Company does not
institute an infringement  proceeding  against an offending Third Party within
180 days of learning of such  infringement or, in the event that a Third Party
files a  paragraph  IV  certification  relating  to any Patent  pursuant to 21
U.S.C.  ss.355(j)(2)(A)(vii)(IV)  of the  Hatch/Waxman  Act (or any  successor
statute), if the Company does not institute an infringement proceeding against
such Third  Party  within 30 days of receipt  of notice of such  paragraph  IV
certification,  ERS shall have the right,  but not the duty, to institute such
an action with respect to any infringement by such Third Party;  provided that
ERS may not enter into any  settlement,  consent  judgment or other  voluntary
final  disposition  of such action which  adversely  effects any Technology or
Trademark without the prior written consent of the Company,  which will not be
unreasonably  withheld.  The costs and expenses of any such action  (including
fees of  attorneys  and  other  professionals)  shall be  borne  by the  Party
instituting  the action,  or, if the Parties elect to cooperate in instituting
and  maintaining  such action,  such costs and expenses  shall be borne by the
Parties in such  proportions  as they may agree in  writing.  Each Party shall
execute all  necessary  and proper  documents,  take such  actions as shall be
appropriate  to allow the other  Party(ies) to institute  and  prosecute  such
infringement  actions and shall  otherwise  cooperate in the  institution  and
prosecution  of such actions  (including,  without  limitation,  consenting to
being  named as a nominal  party  thereto).  Each Party  prosecuting  any such
infringement  actions shall keep the other Parties  reasonably  informed as to
the status of such  actions.  Any award  paid by Third  Parties as a result of
such an


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Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


infringement  action  (whether by way of  settlement  or  otherwise)  shall be
applied first to reimburse the Parties for all costs and expenses  incurred by
the Parties with respect to such action on a pro rata basis and, if after such
reimbursement  any funds shall remain from such award, they shall be allocated
as follows:  (i) if the  Company has  instituted  and  maintained  such action
alone, the Company shall be entitled to retain such remaining  funds;  (ii) if
ERS and/or BMS has  instituted and  maintained  such action alone,  ERS and/or
BMS, as the case may be, shall be entitled to retain such remaining  funds; or
(iii) if the Parties have  cooperated  in  instituting  and  maintaining  such
action,  the Parties shall allocate such remaining funds between themselves in
the same  proportion  as they have agreed to bear the expenses of  instituting
and maintaining such action.

          (c) ERS shall have the first right,  but not the duty,  to institute
patent  infringement  actions  against  Third  Parties based on the use of ERS
Inventions which are used in the development, use, manufacture,  distribution,
promotion  and/or sale of Compounds  and/or Products in the Field. If ERS does
not  institute an  infringement  proceeding  against an offending  Third Party
within 180 days of learning of such infringement or, in the event that a Third
Party  files a  paragraph  IV  certification  relating  to any ERS  Inventions
pursuant to 21 U.S.C. ss.355(j)(2)(A)(vii)(IV) of the Hatch/Waxman Act (or any
successor  statute),  if ERS does not  institute  an  infringement  proceeding
against such Third Party within 30 days of receipt of notice of such paragraph
IV  certification,  the  Company  shall have the right,  but not the duty,  to
institute such an action with respect to any infringement by such Third Party;
provided that the Company may not enter into any settlement,  consent judgment
or other  voluntary final  disposition of such action which adversely  effects
any ERS Inventions without the prior written consent of ERS, which will not be
unreasonably  withheld.  The costs and expenses of any such action  (including
fees of  attorneys  and  other  professionals)  shall be  borne  by the  Party
instituting  the action,  or, if the Parties elect to cooperate in instituting
and  maintaining  such action,  such costs and expenses  shall be borne by the
Parties in such  proportions  as they may agree in  writing.  Each Party shall
execute all  necessary  and proper  documents,  take such  actions as shall be
appropriate  to allow the other  Party(ies) to institute  and  prosecute  such
infringement  actions and shall  otherwise  cooperate in the  institution  and
prosecution  of such actions  (including,  without  limitation,  consenting to
being  named as a nominal  party  thereto).  Each Party  prosecuting  any such
infringement actions shall keep the other Party(ies) reasonably informed as to
the status of such  actions.  Any award  paid by Third  Parties as a result of
such an infringement  action (whether by way of settlement or otherwise) shall
be applied first to reimburse the Parties for all costs and expenses  incurred
by the Parties  with  respect to such action on a pro rata basis and, if after
such  reimbursement  any funds shall  remain  from such  award,  they shall be
allocated as follows: (i) if ERS and/or BMS has instituted and maintained such
action alone,  ERS and/or BMS, as the case may be, shall be entitled to retain
such remaining  funds;  (ii) if the Company has instituted and maintained such
action alone, the Company shall be entitled to retain such remaining funds; or
(iii) if the Parties have  cooperated  in  instituting  and  maintaining  such
action,  the Parties shall allocate such remaining funds between themselves in
the same  proportion  as they have agreed to bear the expenses of  instituting
and maintaining such action.

     9.4 Infringement Action by Third Parties.

          (a) In the event of the institution or threatened institution of any
suit  by a Third  Party  against  ERS for  patent  or  trademark  infringement
involving the manufacture,  use, distribution,  sale or marketing of a Product
in the  Territory,  ERS shall  promptly  notify the Company in writing of such
suit.  Unless  otherwise  covered by Section  12.3(c),  the  Company  shall be
required to  diligently  defend such suit at its own expense shall control the
defense of such action and,  subject to Section  9.4(c),  shall be responsible
for all  damages  incurred  as a result  thereof  and shall  indemnify  ERS in
connection  therewith.  ERS  hereby  agrees to assist and  cooperate  with the
Company,  at the Company's  reasonable request and expense,  in the defense of
any  suit  related  to  the  Technology  or  Trademark   (including,   without
limitation,  consenting to being named as a nominal party thereto).


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Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


During the pendency of such action and thereafter,  ERS shall continue to make
all payments due under this  Agreement.  If the Company  finally  prevails and
receives an award from such Third Party as a result of such action (whether by
way of judgment, award, decree, settlement or otherwise),  such award shall be
retained entirely by the Company.

          (b) In the event of the institution or threatened institution of any
suit by a Third Party  against ERS for patent  infringement  involving the ERS
Inventions which are used in the development, use, manufacture,  distribution,
promotion  and/or sale of Compounds  and/or  Products in the Field,  ERS shall
promptly  notify the Company in writing of such suit. ERS shall be required to
diligently  defend such suit at its own expense,  shall control the defense of
such action and shall be responsible for all payment of damages  incurred as a
result thereof (or payment of any license fees incurred in connection with any
license  obtained by the Parties from such Third Party);  provided that (A) to
the  extent  that such  suit  relates  to ERS  Inventions  used  solely by the
Company,  the Company  shall  diligently  defend such suit at its own expense,
shall  control  the defense of such  action and shall be  responsible  for all
payment of damages  incurred  as a result  thereof  (or payment of any license
fees incurred in connection with any license obtained by the Company from such
Third  Party) and (B) to the extent that such suit  relates to ERS  Inventions
used by both ERS and the Company,  the Parties shall  cooperate in the defense
of such action and shall be responsible  for payment of damages  incurred as a
result thereof (or payment of any license fees incurred in connection with any
license  obtained  by the Parties  from such Third  Party) on a basis which is
proportionate  to their  relative usage of such ERS  Inventions.  In the event
that a Party is solely  responsible  for  defending  an action  involving  ERS
Inventions,  the other  Party(ies) shall assist and cooperate with such Party,
at such Party's  reasonable  request and  expense.  If a Party which is solely
responsible for defending an action involving ERS Inventions  finally prevails
and  receives  an award  from  such  Third  Party as a result  of such  action
(whether by way of judgment,  award,  decree,  settlement or otherwise),  such
award shall be retained  entirely by such Party.  If the Parties  cooperate in
the defense of an action  involving ERS  Inventions  pursuant to (B) above and
such Parties  finally  prevail and receive an award from such Third Party as a
result of such action (whether by way of judgment,  award, decree,  settlement
or  otherwise),  such  award  shall be  shared  on an  equitable  basis by the
Parties.

          (c) Unless otherwise  covered by Section  12.3(c),  (A) in the event
that the PDC determines that a license under Third Party patents or trademarks
should be  obtained  to avoid  infringement  of such  Third  Party  patents or
trademarks  in order to  make,  have  made,  use or sell  any  Product  in any
country(ies) in North America or in Japan, or royalties should be paid to such
Third Party in respect of sales of such Products in such country(ies) in North
America or in Japan  (provided that the Parties agree for the purposes of this
Section 9.4(c),  that the PDC shall be deemed to have determined that licenses
obtained prior to the execution of this Agreement that are held by the Company
should have been so obtained),  or (B) if the Company or ERS finally loses and
is  required  to pay  damages  or an award to a Third  Party as a result of an
action  commenced  under Section  9.4(a)  (whether by way of judgment,  award,
decree, settlement or otherwise); then: (i) the Distribution Fees due from ERS
to the  Company  pursuant  to  Sections  6.3 with  respect  to rights in North
America  shall be  increased  by an amount  equal to [**] of any  royalties or
damages  attributable to Net Sales in North America,  up to a maximum increase
equal to:  (1) [**] of Net  Sales of  Products  in North  America  during  any
calendar  quarter during  calendar years 2002 through and including  2006; and
(2) [**] of Net Sales of Products in North America during any calendar quarter
following 2006; and (ii) with respect to rights in Japan, the Company shall be
entitled to allocate an amount equal to any royalties or damages  attributable
to Net  Sales in Japan  against  Cost of Goods  Sold (in  accordance  with the
Financial  Appendix) up to a maximum amount equal to: (1) [**] of Net Sales of
Products in Japan  during any  calendar  quarter  during  calendar  years 2002
through and including 2006; and (2) [**] of Net Sales of Products in the Japan
during any calendar quarter following 2006.


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Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


10. PUBLICATION; CONFIDENTIALITY

     10.1  Notification.  The Parties  recognize that each may wish to publish
the results of their work  relating to the subject  matter of this  Agreement.
However,  the Parties  also  recognize  the  importance  of  acquiring  patent
protection.  Consequently,  subject  to any  applicable  laws  or  regulations
obligating  any Party to do otherwise,  any proposed  publication by any Party
shall comply with this Section 10. All publications,  whether written or oral,
shall  be  prepared  in  accordance  with  the  joint   publication   strategy
established  and approved by the PDC. At least 45 days before a manuscript  is
to be submitted to a publisher, the publishing Party will provide the PDC with
a copy of the  manuscript.  If the  publishing  Party  wishes  to make an oral
presentation,  it will provide the PDC with a summary of such  presentation at
least 30 days  before  such oral  presentation  and,  if an  abstract is to be
published,  30  days  before  such  abstract  is to  be  submitted.  Any  oral
presentation,   including   any  question   period,   shall  not  include  any
Confidential  Information  unless  the  Parties  otherwise  mutually  agree in
writing in advance of such oral presentation.

     10.2 Review.  The PDC will review the manuscript,  abstract,  text or any
other  material  provided  to it  under  Section  10.1  to  determine  whether
patentable  subject  matter is disclosed.  The PDC will notify the  publishing
Party  within 30 days of receipt of the  proposed  publication  if the PDC, in
good faith,  determines that patentable subject matter is or may be disclosed,
or if the PDC, in good faith, believes  Confidential  Information is or may be
disclosed.  If it is determined by the PDC that patent  applications should be
filed,  the publishing Party shall delay its publication or presentation for a
period  not to  exceed  60  days  from  the  PDC's  receipt  of  the  proposed
publication  or   presentation   to  allow  time  for  the  filing  of  patent
applications  covering  patentable subject matter. In the event that the delay
needed to complete the filing of any necessary patent  application will exceed
the 60-day period, the PDC will discuss the need for obtaining an extension of
the  publication  delay beyond the 60-day period.  If it is determined in good
faith by the PDC that Confidential  Information or proprietary  information is
being  disclosed,  the  Parties  will  consult  in good  faith to arrive at an
agreement on mutually acceptable  modifications to the proposed publication or
presentation to avoid such disclosure.

     10.3  Confidentiality;   Exceptions.   Except  to  the  extent  expressly
authorized by this Agreement or otherwise agreed in writing, the Parties agree
that,  during the term of this  Agreement  and for ten years  thereafter,  the
receiving Party, its Affiliates and its licensees shall, and shall ensure that
their  respective  employees,  officers,  directors and other  representatives
shall, keep completely  confidential and not publish or otherwise disclose and
not  use  for  any  purpose  any  information  furnished  to it or them by the
disclosing  Party,  its  Affiliates or its licensees or developed  under or in
connection  with  this  Agreement,  except  to  the  extent  that  it  can  be
established by the receiving Party by competent  proof that such  information:
(i) was already known to the receiving  Party,  other than under an obligation
of  confidentiality,  at the time of disclosure by the disclosing  Party; (ii)
was generally  available to the public or otherwise  part of the public domain
at the time of its disclosure to the receiving  Party;  (iii) became generally
available to the public or was  otherwise  part of the public domain after its
disclosure  and other than through any act or omission of the receiving  Party
in breach of this  Agreement;  or (iv) was disclosed to the  receiving  Party,
other than under an obligation of confidentiality, by a Third Party who had no
obligation to the disclosing  Party not to disclose such information to others
(all such information to which none of the foregoing exceptions applies, shall
be deemed "Confidential Information").

     10.4 Exceptions to Obligation. The restrictions contained in Section 10.3
shall not apply to  Confidential  Information  that:  (i) is  submitted by the
recipient  to   governmental   authorities   to  facilitate  the  issuance  of
Registrations  for the Product,  provided that  reasonable  measures  shall be


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Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


taken to assure confidential  treatment of such information;  (ii) is provided
by the recipient to Third Parties under confidentiality provisions at least as
stringent  as  those  in  this  Agreement,   for   consulting,   manufacturing
development, manufacturing, external testing, or marketing trials; or (iii) is
otherwise  required to be  disclosed in  compliance  with  applicable  laws or
regulations  or order by a court or other  regulatory  body  having  competent
jurisdiction; provided that if a Party is required to make any such disclosure
of disclosing Party's  Confidential  Information such Party will, except where
impracticable for necessary disclosures (for example, to physicians conducting
studies  or to health  authorities),  give  reasonable  advance  notice to the
disclosing  Party of such  disclosure  requirement  and,  except to the extent
inappropriate in the case of patent applications, will use its best efforts to
secure confidential treatment of such Confidential  Information required to be
disclosed.

     10.5  Limitations  on Use.  Each Party  shall use,  and cause each of its
Affiliates and its licensees to use, any Confidential  Information obtained by
such  Party  from the  disclosing  Party,  its  Affiliates  or its  licensees,
pursuant  to this  Agreement  or  otherwise,  solely  in  connection  with the
activities or transactions contemplated hereby.

     10.6  Remedies.  Each Party shall be  entitled,  in addition to any other
right or remedy it may have, at law or in equity,  to an  injunction,  without
the  posting  of any bond or other  security,  enjoining  or  restraining  the
disclosing  Party,  its Affiliates  and/or its licensees from any violation or
threatened violation of this Section 10.

11. REPRESENTATIONS AND WARRANTIES.

     11.1 Representations and Warranties of the Parties. Each Party represents
and warrants to each of the other Parties, as of the Effective Date, that:

          (a)  Such  Party is duly  organized,  validly  existing  and in good
standing under the laws of the jurisdiction of its  incorporation and has full
corporate  power and  authority to enter into this  Agreement and to carry out
the provisions hereof;

          (b) Such Party has taken all corporate action necessary to authorize
the  execution  and  delivery of this  Agreement  and the  performance  of its
obligations  under this  Agreement  and has full power and  authority to enter
into this Agreement and perform its obligations under this Agreement; and

          (c)  This  Agreement  has  been  duly  executed  by such  Party  and
constitutes a valid and legally binding obligation of such Party,  enforceable
in  accordance  with its terms,  subject  to and  limited  by: (i)  applicable
bankruptcy, insolvency,  reorganization,  moratorium, and other laws generally
applicable  to  creditors'  rights;  and  (ii)  judicial   discretion  in  the
availability of equitable relief.

          (d) Such  Party is not  required  to obtain the  consent,  approval,
order,  or  authorization  of any Third Party,  or complete any  registration,
qualification,  designation,  declaration or filing with, any federal,  state,
local, or provincial  governmental authority, in connection with the execution
and  delivery  of this  Agreement  and the  performance  by such  Party of its
obligations under this Agreement,  including, without limitation, the grant of
rights to the other Parties pursuant to this Agreement, or such Party has done
so (with  respect to the  Company,  including,  without  limitation,


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Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


that all consents, approvals and authorizations required pursuant to the Merck
Agreement have been secured by the Company); and

          (e)  The  execution  and  delivery  of  this   Agreement,   and  the
performance  by such other  Party of its  obligations  under  this  Agreement,
including without limitation the grant of rights to the other Parties pursuant
to this Agreement, will not: (i) conflict with, nor result in any violation of
or default under any such instrument,  judgment, order, writ, decree, contract
or provision;  (ii) give rise to any event that results in the creation of any
lien,  charge or encumbrance  upon any assets of such Party or the suspension,
revocation,  impairment,  forfeiture or  non-renewal  of any material  permit,
license, authorization or approval that applies to such Party, its business or
operations  or any of its assets or  properties;  or (iii)  conflict  with any
rights granted by such Party to any Third Party or breach any obligation  that
such Party has to any Third Party.

     11.2   Representations  and  Warranties  of  the  Company.   The  Company
represents  and  warrants  to each of ERS and BMS, as of the  Effective  Date,
that, except as disclosed in Company SEC Documents or in the disclosure letter
previously delivered by the Company to BMS:

          (a) The Company is the owner of, or has exclusive  rights to, all of
the Patents and  Trademarks  in existence on the Effective  Date,  and has the
exclusive right to grant the rights granted under this Agreement therefor.  To
the knowledge of the Company,  all of the Patents and Trademarks are valid, in
full  force and  effect  and have  been  maintained  to date,  and are not the
subject of any interference or opposition proceedings;

          (b) To the knowledge of the Company, the Company (i) is not aware of
any asserted or unasserted  claims,  interferences,  oppositions or demands of
any Third Party against the  Technology  or the  Trademarks in existence as of
the Effective  Date;  and (ii) to the  knowledge of the Company,  the Parties'
practice of any invention claimed in the Patents or the exercise of any rights
to the Technology or the Trademarks as contemplated by this Agreement will not
infringe any patent or other intellectual property right of any Third Party;

          (c) To the  knowledge of the Company,  the Company has rights to all
of the Know-How in existence on the Effective  Date and the right to grant all
rights with respect thereto granted to ERS pursuant to this Agreement;

          (d) To the knowledge of the Company,  ERS's use of the Compounds and
the Products in the Field,  in  accordance  with the terms of this  Agreement,
would not  infringe  upon or  conflict  with any  patent or other  proprietary
rights in the Territory of any Third Party; and

          (e) To the knowledge of the Company, all of the data and information
provided  to ERS or BMS by the  Company  relating  to the  Technology  and the
Trademarks  is accurate and complete in all material  respects and contains no
material errors or omissions.

     11.3  Representations  and  Warranties of ERS and BMS. Only to the extent
the Company's  representations and warranties set forth in Section 11.2(e) are
true and correct,  each of BMS and ERS represents and warrants to the Company,
as of the Effective Date,  that it has utilized its own scientific,  marketing
and  distribution  expertise  and  experience to analyze and evaluate both the
scientific  and  commercial  value of the  Compound and Product and has solely
relied  on such  analysis  and  evaluations  in  deciding  to enter  into this
Agreement.


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Confidential    treatment   requested   by   Bristol-Myers   Squibb   Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


     11.4  Representations and Warranties of BMS . BMS represents and warrants
to  the  Company,  as of the  Effective  Date,  that  ERS  is a  wholly  owned
subsidiary  of BMS and that ERS owns or controls all or  substantially  all of
BMS's pharmaceutical business in the U.S.

12. RECALL; INDEMNIFICATION.

     12.1 Investigation; Recall. In the event that the Regulatory Authority in
any country in the  Territory  shall  allege or prove that a Product  does not
comply with applicable rules and regulations in such country, ERS shall notify
the Company immediately.  The JCC shall conduct any appropriate  investigation
and shall make a determination  as to the  disposition of any such matter.  If
ERS is  required  or if the JCC  should  deem it  appropriate  to  recall  any
Product, the Company and ERS shall bear the costs and expenses associated with
such recall, in North America in the proportion of 39% for the Company and 61%
for ERS,  and in Japan in the  proportion  for which such Party is entitled to
receive  Operating  Profit  or  Loss,  as the  case  may be,  unless:  (i) the
predominant  cause  of  such  recall  results  from or  also  constitutes  the
Company's  breach of its  representation  and/or warranty set forth in Section
11.2(e)  and/or  ERS's  reliance  upon  such  breached  representation  and/or
warranty,  or unless the  predominant  cause of such recall  results  from the
Company's  willful  wrongdoing  or  negligence,  in each such case the Company
shall bear all costs and expenses  associated  with such  recall;  or (ii) the
predominant  cause of such recall  results from ERS's  willful  wrongdoing  or
negligence,  in which  case ERS shall bear all costs and  expenses  associated
with such recall.

     12.2 Indemnification by ERS and BMS. ERS and BMS shall indemnify,  defend
and hold  harmless  the  Company  and its  Affiliates,  and  their  respective
directors,  officers,  employees  and  agents,  from and  against  any and all
liabilities,  damages,  losses,  costs and expenses  (including the reasonable
fees of attorneys  and other  professionals)  to the extent  arising out of or
resulting from:

          (a)  negligence,   recklessness  or  wrongful  intentional  acts  or
omissions of ERS or its Affiliates, and their respective directors,  officers,
employees  and agents,  in  connection  with the work  performed by ERS or BMS
under the  Clinical  Development  Plans or the  fulfillment  of ERS's or BMS's
obligations under the Marketing Plans;

          (b) any  manufacture,  use,  distribution or sale of the Products by
ERS or its  Affiliates  or due to any  negligence,  recklessness,  or wrongful
intentional acts or omissions by or strict liability of, ERS or its Affiliates
and their respective directors, officers, employees and agents.; or

          (c) any breach of any  representation or warranty made by ERS or BMS
under Sections 11.1, 11.3 or 11.4.

     12.3 Indemnification by the Company. The Company shall indemnify,  defend
and  hold  harmless  ERS,  BMS and  their  respective  Affiliates,  and  their
respective directors, officers, employees and agents, from and against any and
all liabilities, damages, losses, costs and expenses (including the reasonable
fees of attorneys  and other  professionals)  to the extent  arising out of or
resulting from:

          (a)  negligence,   recklessness  or  wrongful  intentional  acts  or
omissions of the Company or its Affiliates,  and their  respective  directors,
officers,  employees and agents, in connection with the Company's  fulfillment
of its obligations under the Clinical  Development Plans or the fulfillment of
the Company's rights or obligations under the Marketing Plans;


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Confidential   treatment   requested  by   Bristol-Myers   Squibb  Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


          (b)  failure  of API to meet the  Specifications  and/or  applicable
Manufacturing  Standards  or use of Products or  promotion  of Products not in
conformity with Product labeling, by the Company or its Affiliates,  or due to
any negligence,  recklessness or wrongful intentional acts or omissions by, or
strict  liability  of, the  Company or its  Affiliates,  and their  respective
directors, officers, employees and agents; or

          (c) any breach of any representation or warranty made by the Company
under Section 11.1 or 11.2.

     12.4  Notice of  Indemnification.  In the event  that any  Person  (an
"Indemnitee")  entitled to  indemnification  under  Section 12.2 or 12.3 is
seeking such indemnification, such Indemnitee shall inform the indemnifying
Party of the claim as soon as reasonably  practicable after such Indemnitee
receives  notice of such  claim,  shall  permit the  indemnifying  Party to
assume  direction  and control of the defense of the claim  (including  the
sole right to settle it at the sole discretion of the  indemnifying  Party,
provided  that  such  settlement  does not  impose  any  obligation  on, or
otherwise adversely affect, the Indemnitee or any of the other Parties) and
shall cooperate as requested (at the expense of the indemnifying  Party) in
the defense of the claim.

     12.5  Complete   Indemnification.   As  the  Parties  intend  complete
indemnification,  all costs  and  expenses  incurred  by an  Indemnitee  in
connection  with  enforcement  of  Sections  12.2  and 12.3  shall  also be
reimbursed by the indemnifying Party.

13.  TERM; TERMINATION.

     13.1 Term. This Agreement  shall become  effective as of the Effective
Date and,  unless earlier  terminated  pursuant to the other  provisions of
this Section 13, shall expire as follows:

          (a) As to each  Product in each  country in the  Territory,  this
Agreement  shall  expire  on the  later  of:  (i)  the  seventeenth  (17th)
anniversary  of the  Effective  Date, or (ii) the date on which the sale of
such Product ceases to be covered by Valid Claim in such country.

          (b)  This  Agreement  shall  expire  in  its  entirety  upon  the
expiration of this  Agreement with respect to all Products in all countries
in the Territory pursuant to Section 13.1(a).

13.2  Termination for Cause.

          (a) The Company  may,  without  prejudice  to any other  remedies
available to it at law or in equity,  terminate this Agreement in the event
that either BMS or ERS (as used in this subsection,  the "Breaching Party")
shall have  materially  breached or defaulted in the  performance of any of
its material obligations  hereunder,  and such default shall have continued
for 60 days after  written  notice  thereof was  provided to the  Breaching
Party by the  Company  (or,  if such  default  cannot be cured  within such
60-day  period,  if the  Breaching  Party does not commence and  diligently
continue actions to cure such default during such 60-day period).  Any such
termination  shall become effective at the end of such 60-day period unless
the  Breaching  Party  has cured any such  breach or  default  prior to the
expiration  of such  60-day  period (or,  if such  default  cannot be cured
within  such  60-day  period,  if the  Breaching  Party has  commenced  and
diligently  continued  actions  to cure  such  default).  The  right of the
Company to terminate this  Agreement,  as provided in this


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Confidential   treatment   requested  by   Bristol-Myers   Squibb  Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


Section  13.2(a)  shall not be affected in any way by its waiver or failure
to take action with respect to any previous default.

          (b) ERS or BMS (as used in this  subsection,  the  "Non-Breaching
Party") may, without  prejudice to any other remedies  available to them at
law or in equity,  terminate  this Agreement in the event the Company shall
have  materially  breached or  defaulted in the  performance  of any of its
material obligations  hereunder,  and such default shall have continued for
60 days after  written  notice  thereof was  provided to the Company by the
Non-Breaching Party (or, if such default cannot be cured within such 60-day
period, if the Company does not commence and diligently continue actions to
cure such default during such 60-day period).  Any such  termination  shall
become  effective at the end of such 60-day  period  unless the Company has
cured any such  breach or default  prior to the  expiration  of such 60-day
period (or, if such default cannot be cured within such 60-day  period,  if
the Company has commenced  and  diligently  continued  actions to cure such
default).  The right of either ERS or BMS to terminate this  Agreement,  as
provided in this Section  13.2(b)  shall not be affected in any way by such
Party's  waiver or  failure to take  action  with  respect to any  previous
default.

     13.3  Termination by ERS . ERS shall have the right,  upon six months'
prior written notice to the Company setting forth the reasons therefor,  to
have the JEC determine  whether or not there exists a  significant  concern
regarding a regulatory or patient safety issue that would seriously  impact
the long term viability of all Products. If the JEC can not reach agreement
regarding such a question,  then the matter shall be resolved in accordance
with the  Accelerated  Arbitration  Provisions  of  Section  16.13(b).  The
Agreement  shall  immediately  terminate  upon  a  finding  by  the  JEC or
arbitrators,  as the case may be, that there exists a  significant  concern
regarding a regulatory or patient safety issue that would seriously  impact
the long term viability of all Products.

     13.4  Termination by the Company.  The Company shall have the right to
terminate this Agreement effective immediately if: (i) (A) the Offer is not
consummated on or before the Termination Date and (B) as of the Termination
Date the waiting period applicable to the Offer under the Hart-Scott-Rodino
Antitrust  Improvements  Act of 1976,  as amended shall not have expired or
been terminated,  or (ii) (A) the Offer is not consummated on or before the
Termination  Date and (B) there exists on the Termination Date an Antitrust
Injunction;  or (iii) BMS and Acquisition  Subsidiary  shall have failed to
commence the Offer in the time required by the  Acquisition  Agreement;  or
(iv) all of the  conditions  to the  Offer  set  forth  in the  Acquisition
Agreement shall have been satisfied and Acquisition  Subsidiary  shall have
failed to accept for  payment or pay for  Shares  tendered  in the Offer as
required by the terms of the Acquisition Agreement.

     13.5 Termination in Connection With Additional  Studies.  If, pursuant
to  Section  4.8,  the PDC  does not  receive  the  approval  of the JEC to
undertake the  additional  clinical  studies  required by the FDA within 90
days of making its formal  recommendation  of its  conclusions  to the JEC,
then any Party may terminate  this  Agreement  effective  immediately  upon
giving the other Parties notice of such termination.

     13.6 Effect of Expiration or  Termination.  If this Agreement  expires
pursuant  to its  terms or is  terminated  by any  Party  pursuant  to this
Section 13, in addition to any other  remedies  available to the Parties at
law or in equity:  (i) ERS and BMS shall  promptly  transfer to the Company
copies of all data,  reports,  records and materials in their possession or
control  that relate to the Products and return to the Company all relevant
records  and   materials  in  their   possession   or  control   containing
Confidential Information of the Company (provided that ERS and BMS may keep
one copy of such


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Confidential   treatment   requested  by   Bristol-Myers   Squibb  Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


Confidential  Information of the Company for archival  purposes only); (ii)
ERS and BMS shall transfer to the Company,  or shall cause its  designee(s)
to  transfer  to  the  Company,   ownership   of  all  INDs,   Registration
Applications,  Registrations and other regulatory filings made or filed for
such  Products  (to the  extent  that any are held in ERS's,  BMS's or such
designee(s)'s  name), if permitted by applicable laws and regulations;  and
(iii) the Company  shall  promptly  return to ERS all relevant  records and
materials in the Company's  possession or control  containing  Confidential
Information  of ERS or BMS (provided  that the Company may keep one copy of
such Confidential Information of ERS and BMS for archival purposes only).

     13.7  Accrued Rights; Surviving Obligations.

          (a) Termination,  relinquishment  or expiration of this Agreement
for any reason  shall be without  prejudice  to any rights  that shall have
accrued  to  the   benefit  of  any  Party   prior  to  such   termination,
relinquishment   or  expiration.   Such   termination,   relinquishment  or
expiration shall not relieve any Party from obligations which are expressly
indicated to survive  termination  or  expiration  of this  Agreement.  All
obligations  which are not expressly  indicated to survive  termination  or
expiration  of this  Agreement  shall  terminate  upon the  termination  or
expiration of this Agreement.

          (b) All of the Parties' rights and obligations under,  and/or the
provisions  contained in, Sections 1, 3.3(unless ERS or BMS terminates this
Agreement  pursuant to Section  13.2(b)),  4.10,  6.2(b), 7, 9.1, 9.3, 9.4,
10.3,  10.4,  10.5,  10.6,  12, 13.6,  13.7,  15.2(only to the extent ERS's
obligations under this Agreement survive termination), and 16 shall survive
termination, relinquishment or expiration of this Agreement.

14.  FORCE MAJEURE.

     14.1 Events of Force Majeure. None of the Parties shall be held liable
or  responsible  to the other Parties nor be deemed to be in default under,
or in breach of any  provision  of, this  Agreement for failure or delay in
fulfilling or performing any obligation of this Agreement when such failure
or delay is due to force  majeure,  and without the fault or  negligence of
the Party so failing or  delaying.  For purposes of this  Agreement,  force
majeure is defined as causes  beyond the  control of the Party,  including,
without  limitation,  acts  of  God;  acts,  regulations,  or  laws  of any
government;  war; civil commotion;  destruction of production facilities or
materials  by  fire,   flood,   earthquake,   explosion  or  storm;   labor
disturbances; epidemic; and failure of public utilities or common carriers.
In such event the  Company or ERS,  as the case may be,  shall  immediately
notify the other Parties of such inability and of the period for which such
inability  is  expected to  continue.  The Party  giving such notice  shall
thereupon be excused from such of its  obligations  under this Agreement as
it is thereby disabled from performing for so long as it is so disabled and
the 30 days  thereafter.  To the  extent  possible,  each  Party  shall use
reasonable efforts to minimize the duration of any force majeure

15.  ADDITIONAL COVENANTS OF BMS AND BMS GUARANTEE.

     15.1  Additional  Covenants of BMS. BMS hereby agrees that for so long
as ERS is a party to this Agreement (and ERS's rights and obligations under
this Agreement have not been assigned in accordance with Section 16.2), ERS
will remain a wholly owned  subsidiary  of BMS.  Each of BMS and ERS hereby
agree  that in the  event  that  BMS or ERS  sells,  assigns  or  otherwise
transfers  all  or  substantially  all of the  pharmaceutical  business  or
pharmaceutical oncology business (or control thereof) held by BMS or ERS to
any other  Person,  all of BMS's and ERS's,  as the case may be, rights and
obligations under this Agreement shall be included in such transfer and the
transferee  shall  agree


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Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


in writing to be bound by the terms of this Agreement in form and substance
satisfactory  to the  Company  (and such  transfer  shall  otherwise  be in
accordance with Section 16.2).

     15.2  BMS  Guarantee  BMS  hereby   irrevocably  and   unconditionally
guarantees  to the Company the prompt and full  discharge  by ERS of all of
ERS's  covenants,  agreements,   obligations  and  liabilities  under  this
Agreement  including,  without limitation,  the due and punctual payment of
all amounts which are or may become due and payable by ERS  hereunder  when
and as the  same  shall  become  due and  payable  (collectively,  the "ERS
Obligations"),  in accordance with the terms hereof.  BMS  acknowledges and
agrees  that,  with  respect  to all ERS  Obligations  to pay  money,  such
guaranty  shall  be a  guaranty  of  payment  and  performance  and  not of
collection and shall not be  conditioned or contingent  upon the pursuit of
any  remedies  against  ERS. If ERS shall  default in the due and  punctual
performance of any ERS Obligation, including the full and timely payment of
any  amount  due and  payable  pursuant  to any ERS  Obligation,  BMS  will
forthwith  perform or cause to be performed  such ERS  Obligation  and will
forthwith  make full payment of any amount due with respect  thereto at its
sole cost and expense.

16.  MISCELLANEOUS.

     16.1 Relationship of Parties. Nothing in this Agreement is intended or
shall be deemed to constitute a partnership,  agency,  employer-employee or
joint venture  relationship  between the Parties.  No Party shall incur any
debts or make any  commitments for the other,  except to the extent,  if at
all, specifically provided herein.

     16.2  Assignment.  No Party  shall be entitled to assign its rights or
delegate its obligations  hereunder  without the express written consent of
the other  Parties  hereto,  except  that (i) ERS may assign its rights and
transfer its duties hereunder, without the consent of the Company, (A) to a
directly or indirectly wholly-owned subsidiary of BMS, or (B) to the extent
that such  rights  and duties  solely  relate to Japan,  to a  directly  or
indirectly  majority-owned subsidiary of BMS (provided that, in the case of
(A)  and  (B),  such  subsidiary  remains  so  owned,  BMS  guarantees  the
obligations of such  subsidiary  under this Agreement in form and substance
satisfactory to the Company,  and no such  assignment  shall relieve BMS or
ERS of any of its obligations  under this Agreement),  (ii) each of BMS and
ERS may assign its rights and  transfer its duties  hereunder,  without the
consent of the Company to any assignee of all or substantially all of BMS's
business (or that portion of its overall  business of which this  Agreement
is a part (e.g.  all of its  pharmaceutical  business,  its  pharmaceutical
oncology  business))  or in the  event of BMS's  merger,  consolidation  or
involvement in a similar transaction;  provided that, in the case of (i) or
(ii),  the  assignee  agrees  in  writing  to be bound by the terms of this
Agreement;  and (iii) the  Company may assign its rights and  transfer  its
duties  hereunder,  without the consent of ERS or BMS, to (A) a directly or
indirectly  wholly-owned  subsidiary  of the  Company  (provided  that such
subsidiary remains so owned, the Company guarantees the obligations of such
subsidiary under this Agreement in form and substance  satisfactory to BMS,
and no such assignment  shall relieve the Company of any of its obligations
under this Agreement),  or (B) to any assignee of all or substantially  all
of its  business  (or that  portion of its  overall  business of which this
Agreement  is  a  part  (e.g.  all  of  its  pharmaceutical  business,  its
pharmaceutical oncology business)) or in the event of the Company's merger,
consolidation or involvement in a similar  transaction,  subject to Section
6.4;  provided  that,  in the case of (A) or (B),  the  assignee  agrees in
writing  to be  bound by the  terms of this  Agreement.  No  assignment  or
transfer  shall be valid or effective  unless done in accordance  with this
Section 16.2.

     16.3 Books and Records.  Any books and records to be maintained  under
this  Agreement  by a  Party  or its  Affiliates  shall  be  maintained  in
accordance with GAAP.


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Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


     16.4  Further  Actions.  Solely to the extent  necessary  to allow any
Party to use it rights and perform its  obligations  under this  Agreement,
each Party  hereby  grants to the other  Parties and their  Affiliates  the
rights to use the Patents,  Know-How and ERS Inventions (as  applicable) in
the Territory in accordance with this Agreement.  Each Party shall execute,
acknowledge  and deliver  such further  instruments,  and do all such other
acts, as may be necessary or appropriate in order to carry out the purposes
and intent of this Agreement.

     16.5 Notice.

          (a) Any  notice,  request  or  other  communication  required  or
permitted to be given under or in connection  with this Agreement  shall be
deemed  to have  been  sufficiently  given  if in  writing  and  personally
delivered or sent by certified mail (return receipt  requested),  facsimile
transmission  (receipt  verified),  or overnight  express  courier  service
(signature  required),  prepaid,  to the  Party for  which  such  notice is
intended, at the address set forth for such Party below:

               In the case of the Company, to:

                        ImClone Systems Incorporated
                        180 Varick Street
                        New York, New York 10014
                        Attention: John B. Landes, General Counsel
                        Facsimile No: (1 212) 645-2770
                        Telephone No.:(1 212) 645-1405


               With a copy to:

                        Davis Polk Wardwell
                        450 Lexington Avenue
                        New York, NY 10017
                        Attention: Phillip R. Mills, Esq.
                        Facsimile No: (1 212) 450-4800
                        Telephone No.:(1 212) 450-4000


               In the case of BMS or ERS, to:

                        Bristol-Myers Squibb Company
                        P.O.  Box 4000
                        Route 206 & Province Line Road
                        Princeton, NJ 08543-4000 USA

                        Attention:  Vice President and Senior Counsel,
                                    Pharmaceutical Research Institute, and
                                    Worldwide Franchise Management and
                                    Business Development

                        Facsimile:  (1 609) 252-4232
                        Attention:  Vice President, Alliance Management


                                    55





Confidential   treatment   requested  by   Bristol-Myers   Squibb  Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


                        Facsimile:  (1 609) 252-7235

     or to such other  address for such Parties as it shall have  specified
by like notice to the other  Parties,  provided that notices of a change of
address  shall be  effective  only upon receipt  thereof.  Except where the
express  language of this Agreement  indicates that BMS (and not ERS) is to
be given notice,  delivered  materials and  information or consulted  with,
notice given to, delivery of materials and information to or  consultations
with ERS hereunder shall be deemed to have been given, delivered, and made,
as the case may be, with each of BMS and ERS. If delivered personally or by
facsimile transmission, the date of delivery shall be deemed to be the date
on which such notice or request  was given.  If sent by  overnight  express
courier  service,  the  date of  delivery  shall be  deemed  to be the next
business day after such notice or request was deposited  with such service.
If sent by certified  mail,  the date of delivery shall be deemed to be the
third business day after such notice or request was deposited with the U.S.
Postal Service.

     16.6 Use of Name. Except as otherwise provided herein, the Company, on
the one hand, and ERS and BMS, on the other hand, shall not have any right,
express or implied,  to use in any manner the name or other  designation of
the  other or any  other  trade  name,  trademark  or  logos  of the  other
(including,   without  limitation,  the  Trademarks)  for  any  purpose  in
connection with the performance of this Agreement.

     16.7 Public  Announcements.  Except as permitted by Section 10.4, none
of the Parties shall make any public announcement concerning this Agreement
or the  subject  matter  hereof  without  first  consulting  with the other
Parties and providing  such Party with a reasonable  opportunity to comment
on such proposed public announcement.

     16.8 Waiver.  A waiver by any Party of any of the terms and conditions
of this  Agreement in any instance shall not be deemed or construed to be a
waiver of such  term or  condition  for the  future,  or of any  subsequent
breach  hereof.  All  rights,  remedies,   undertakings,   obligations  and
agreements contained in this Agreement shall be cumulative and none of them
shall be in limitation of any other remedy, right, undertaking,  obligation
or agreement of any Party.

     16.9 Compliance with Law. Nothing in this Agreement shall be deemed to
permit a Party to export,  reexport or otherwise  transfer any Product sold
under this Agreement without compliance with applicable laws.

     16.10  Severability.  When possible,  each provision of this Agreement
will be  interpreted  in such  manner as to be  effective  and valid  under
applicable  law,  but if any  provision  of  this  Agreement  is held to be
prohibited  by or invalid under  applicable  law,  such  provision  will be
ineffective only to the extent of such  prohibition or invalidity,  without
invalidating the remainder of this Agreement.

     16.11  Amendment.  No  amendment,  modification  or  supplement of any
provisions  of this  Agreement  shall be valid or effective  unless made in
writing and signed by a duly authorized officer of each Party.

     16.12   Governing  Law.  This  Agreement  shall  be  governed  by  and
interpreted  in  accordance  with the laws of the State of New York without
regard to conflicts of law principles.


                                    56





Confidential   treatment   requested  by   Bristol-Myers   Squibb  Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


     16.13 Arbitration.

          (a) Except as expressly otherwise provided in this Agreement, any
dispute arising out of or relating to the  interpretation of any provisions
of this Agreement or the failure of any Party to perform or comply with any
obligations  or  conditions  applicable  to  such  Party  pursuant  to this
Agreement  shall be finally  settled by arbitration  under the then current
commercial  arbitration  rules of the American  Arbitration  Association in
accordance with the terms set forth in this Section 16.13(a):

               (i) The place of  arbitration  of any  dispute  shall be New
York, New York. Such arbitration  shall be conducted by three  arbitrators,
one appointed by each of ERS and the Company and the third  selected by the
first two appointed  arbitrators.  Each  arbitrator  shall be a person with
relevant  experience in the  pharmaceutical  industry.  ERS and the Company
shall  instruct  such  arbitrators  to render a  determination  of any such
dispute within four months after the appointment of the third arbitrator.

               (ii) Any award  rendered by the  arbitrators  shall be final
and binding  upon the  Parties.  Judgment  upon any award  rendered  may be
entered in any court having  jurisdiction,  or  application  may be made to
such  court  for a  judicial  acceptance  of  the  award  and an  order  of
enforcement,  as the case may be. Each Party shall pay its own  expenses of
arbitration,  and the expenses of the  arbitrators  shall be equally shared
between ERS and the Company unless the arbitrators  assess as part of their
award all or any part of the  arbitration  expenses  of a Party or  Parties
(including  reasonable attorneys' fees) against the other Party or Parties,
as the case may be.

               (iii) This Section  16.13(a) shall not prohibit a Party from
seeking  injunctive  relief from a court of competent  jurisdiction  in the
event of a breach  or  prospective  breach of this  Agreement  by any other
Party which would cause irreparable harm to the first Party.

          (b)  Whenever  a  dispute  arising  out  of or  relating  to  the
interpretation  of any  provisions of this  Agreement or the failure of any
Party to perform or comply with any obligations or conditions applicable to
such Party pursuant to this Agreement  arises and such dispute is expressly
designated  as one  to be  resolved  through  the  Accelerated  Arbitration
Provisions, then such dispute shall be finally settled by arbitration under
the then  current  expedited  procedures  applicable  to the  then  current
commercial  arbitration  rules of the American  Arbitration  Association in
accordance   with  the  terms  set  forth  in  this   subsection  (b)  (the
"Accelerated Arbitration Provisions"):

               (i) The place of  arbitration  of any  dispute  shall be New
York, New York. Such arbitration  shall be conducted by three  arbitrators,
one appointed by each of ERS and the Company and the third  selected by the
first two appointed  arbitrators.  Each  arbitrator  shall be a person with
relevant  experience in the  pharmaceutical  industry.  ERS and the Company
shall  instruct  such  arbitrators  to render a  determination  of any such
dispute  within  15  business  days  after  the  appointment  of the  third
arbitrator.  ERS and the Company  must make their  respective  appointments
within  five  business  days of notice  being given to a Party by the other
Parties of its intention to resolve such dispute through these  arbitration
provisions.  Such appointed  arbitrators  must select the third  arbitrator
within  five  business  days  of the  last to  occur  of  their  respective
appointments.  The dispute  shall be resolved by  submission  of  documents
unless the arbitration  panel determines that an oral hearing is necessary.
The  arbitration  panel  shall,  within the  overall 15  business  day time


                                    57





Confidential   treatment   requested  by   Bristol-Myers   Squibb  Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


constraint,  determine  what  shall be  conclusively  deemed to be fair and
appropriate  deadlines for submitting  documents and dates, if any, of oral
hearings.

               (ii) Any award  rendered by the  arbitrators  shall be final
and binding  upon the  Parties.  Judgment  upon any award  rendered  may be
entered in any court having  jurisdiction,  or  application  may be made to
such  court  for a  judicial  acceptance  of  the  award  and an  order  of
enforcement,  as the case may be. Each Party shall pay its own  expenses of
arbitration,  and the expenses of the  arbitrators  shall be equally shared
between ERS and the Company unless the arbitrators  assess as part of their
award all or any part of the  arbitration  expenses  of a Party or  Parties
(including  reasonable attorneys' fees) against the other Party or Parties,
as the case may be.

               (iii) This Section  16.13(b) shall not prohibit a Party from
seeking  injunctive  relief from a court of competent  jurisdiction  in the
event of a breach  or  prospective  breach of this  Agreement  by any other
Party which would cause irreparable harm to the first Party.

     16.14  Entire  Agreement.   This  Agreement,   the  disclosure  letter
referenced in Section 11.2,  the  Confidentiality  Agreement (as defined in
the Acquisition  Agreement),  the Acquisition Agreement and the Stockholder
Agreement constitute the entire agreement among the Parties with respect to
the subject matter of this Agreement and supersede all prior agreements and
understandings,  both oral and  written,  among the Parties with respect to
the subject matter of this Agreement.

     16.15  Parties in Interest.  All of the terms and  provisions  of this
Agreement shall be binding upon, inure to the benefit of and be enforceable
by the  Parties  hereto  and  their  respective  permitted  successors  and
assigns.

     16.16 Descriptive Headings. The descriptive headings of this Agreement
are for convenience  only, and shall be of no force or effect in construing
or interpreting any of the provisions of this Agreement.

     16.17 Counterparts.  This Agreement may be executed  simultaneously in
any number of counterparts, any one of which need not contain the signature
of more than one  Party  but all such  counterparts  taken  together  shall
constitute one and the same agreement.

                                    ***


                                    58





Confidential   treatment   requested  by   Bristol-Myers   Squibb  Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.



          IN WITNESS WHEREOF, each of the Parties has caused this Agreement
to be executed by its duly authorized representative as of the day and year
first above written.

                               IMCLONE SYSTEMS INCORPORATED

                               By:       /S/ Samuel D. Waksal
                                  ---------------------------------------------

                               Name:     Samuel D. Waksal
                                    -------------------------------------------

                               Title:    President and Chief Executive Officer
                                     ------------------------------------------



                               E. R. SQUIBB & SONS, LLC

                               By:       /S/ Charles Linzner
                                  ---------------------------------------------

                               Name:     Charles Linzner
                                    -------------------------------------------

                               Title:    Vice President and Senior Counsel
                                     ------------------------------------------



                               BRISTOL-MYERS SQUIBB COMPANY

                               By:       /S/ Brian Markison
                                  ---------------------------------------------

                               Name:     Brian Markison
                                    -------------------------------------------

                               Title:    Senior Vice President
                                     ------------------------------------------


                                    59





Confidential   treatment   requested  by   Bristol-Myers   Squibb  Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


                                 Exhibit 1.13

                             BASE CASE PROJECTIONS

SEE THE ATTACHED TABLES.


                                    60








                                                                                               Exhibit 1.13 Base Case Projections

PROJECT ICE
C225 SALES SUMMARY
UNITED STATES & JAPAN
$Millions


                                                                             
Base Case           2002   2003   2004   2005   2006   2007   2008   2009   2010   2011   2012   2013   2014   2015   2016   2017
---------           ----   ----   ----   ----   ----   ----   ----   ----   ----   ----   ----   ----   ----   ----   ----   ----
UNITED STATES       [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]
  - % change        [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]

JAPAN (50%)         [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]
  - % change        [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]
---------------------------------------------------------------------------------------------------------------------------------

TOTAL               [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]
  - % change        [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]




[**]





Confidential   treatment   requested  by   Bristol-Myers   Squibb  Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


                                 Exhibit 1.46

                             FINANCIAL APPENDIX

     This provides the definitions of certain financial terms applicable to
the Parties for  purposes of the  Agreement;  provided,  however,  that the
definition of "Fully  Burdened  Manufacturing  Costs" shall apply to ERS or
the  Company  to the  extent it  manufactures  any  Product  (or  component
thereof)  under the Agreement and the  definition  of  "Development  Costs"
shall apply to the development work of the Parties under the Agreement. All
capitalized  terms used herein without  definition  shall have the meanings
ascribed  thereto in the Agreement,  unless  otherwise  expressly  provided
herein.  References in this Exhibit 1.46 to a "Party" or "Parties" shall be
construed to mean ERS or the Company, as the case may be, and in every case
shall be deemed to include the Party's Affiliates under the Agreement.

Principles of Reporting

     The presentation of results of operations of ERS in North America will
be  based  on  ERS's  financial  information  for  each  Product  presented
separately  by Product and on a  consolidated  basis across all Products in
the reporting format depicted as follows:

--------------------------------------------- --------------------------------
North America                                         Total
--------------------------------------------- --------------------------------
Net Sales of [Product name / all Products]
--------------------------------------------- --------------------------------


     The presentation of results of operations of the Parties in Japan will
be based on each Party's respective financial  information for each Product
presented separately, by Party and by Product, and on a consolidated basis,
by Party (across all Products),  by Product (across the Parties) and across
all Products and the Parties, in the reporting format depicted as follows:

---------------------------- ---------------- ---------------- --------------
[**]                               ERS          The Company        Total

---------------------------- ---------------- ---------------- --------------
[**]
---------------------------- ---------------- ---------------- --------------
[**]
------------- -------------- ---------------- ---------------- --------------
[**]
---------------------------- ---------------- ---------------- --------------
              [**]
------------- -------------- ---------------- ---------------- --------------
              [**]
------------- -------------- ---------------- ---------------- --------------
              [**]
------------- -------------- ---------------- ---------------- --------------
              [**]
------------- -------------- ---------------- ---------------- --------------
              [**]
------------- -------------- ---------------- ---------------- --------------
              [**]
------------- -------------- ---------------- ---------------- --------------
[**]
---------------------------- ---------------- ---------------- --------------


     It is the  intention of the Parties that the  interpretation  of these
definitions will be consistent with GAAP.

         If necessary, a Party will make the appropriate adjustments to the
financial information it supplies under the Agreement to conform to the above
format of reporting results of operation.


                                    61





Confidential   treatment   requested  by   Bristol-Myers   Squibb  Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


Frequency of Reporting

     The fiscal year will be a calendar year.

     Reports of results  compared to budget  shall be made to the  relevant
Committee on a quarterly basis and on a year-to-date  basis, for the entire
Territory.  After approval by the appropriate Committee as to amounts, such
Committee shall forward the report to the JEC for its approval.

     ERS will be responsible for the preparation of consolidated  reporting
for Japan,  calculation of the profit/loss sharing and determination of the
cash settlement.  ERS will provide the Finance Committee within 30 business
days or receipt of each Party's financial information,  a statement showing
the  consolidated  results and  calculations  of the  sharing of  Operating
Profit or Loss in Japan and cash settlement  required in a format agreed to
by the Parties.

Definitions

     "Allocable   Overhead"  means  costs  directly  related  to  the  [**]
including,  but not  limited  to,  those  which are  attributable  to [**].
Allocable  Overhead  shall  not  include  any  costs  attributable  to [**]
including, by way of example, [**].

     "Cost of Goods  Sold"  means Fully  Burdened  Manufacturing  Costs (as
defined  below) of each Party  relating  to  Finished  Product for sales in
[**].

     "Development Costs"

     (a) In each of North America and Japan,  "Development Costs" means the
development costs incurred by each Party with respect to a Product in North
America  or  Japan,  as the case may be,  from  the  Effective  Date of the
Agreement  through  the  later of (i) the date of  Registration  (including
thereafter  costs to maintain or expand such  Registration) of such Product
in the Field in North  America  or  Japan,  as the case may be, or (ii) the
date of termination of development efforts of such Product in the Field for
which Registration is sought, as applicable in North America or Japan. Such
costs shall comprise those costs required to obtain, maintain and/or expand
the relevant authorization and/or ability to manufacture,  formulate, fill,
use, ship, sell and/or distribute such Product in commercial  quantities to
Third Parties in North America or Japan, as the case may be.

     (b) In each of North  America  and Japan,  "Development  Costs"  shall
include,  without  limitation,  costs of research or development  including
costs of studies on the  toxicological,  pharmacokinetical,  metabolical or
clinical  aspects  of a  Product  conducted  internally  or  by  individual
investigators  or  consultants  necessary  for the  purpose  of  obtaining,
maintaining  and/or expanding  marketing  approval of a Product,  costs for
preparing,  submitting, reviewing or developing data or information for the
purpose of  submission  to a  governmental  authority  to obtain,  maintain
and/or expand  marketing  approval of a Product,  and applicable  Allocable
Overhead.

     (c) In each of North America and Japan, "Development Costs" shall also
include,  without


                                    62





Confidential   treatment   requested  by   Bristol-Myers   Squibb  Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


limitation, expenses for data management,  statistical designs and studies,
document preparation, and other administration expenses associated with the
clinical  testing program or  post-marketing  studies  required to maintain
product approvals.

     (d) In determining  Development  Costs chargeable under the Agreement,
each Party will use its  respective  project  accounting  systems  and will
review  and  approve  its  respective   project   accounting   systems  and
methodologies with the other Parties.

     "Distribution  Costs" means the costs,  including applicable Allocable
Overhead,  specifically  identifiable  to the  distribution of a Product in
North America or Japan, as the case may be, by a Party  including  customer
services,  collection of data about sales to hospitals and other end users,
order entry, billing,  shipping,  bad debt, credit and collection and other
such activities.

     "Fully Burdened  Manufacturing Costs" of an item or items,  including,
without limitation,  API or a Finished Product (in bulk or finished product
form,  as  the  case  may  be)  means  100%  of a  Party's  fully  burdened
manufacturing cost (as defined in the Party's generally accepted accounting
policies consistently applied) which shall comprise the sum of:

     (a) For API:

     Cost of Raw Materials

          The  purchase  unit  cost  of raw  materials  multiplied  by [**]
     including [**] and any [**].


     Direct Labor and Allocable Overhead Costs

          The cost of direct  labor and  manufacturing  overhead  resources
     consumed in the production process.

          Costs  will  include  any   efficiency,   activity  and  spending
     variances  from  standards  as  well  as  any  underabsorbed  overhead
     expenses incurred during the startup of the biologic operation for the
     Product or caused by  subsequent  evolution of the  Product's  volumes
     sold in North America or Japan, as the case may be, including, without
     limitation,  process  development,   process  improvement,   scale-up,
     recovery, and qualification lots costs.

          Manufacturing overhead includes the following costs:

               Normal depreciation of building, machinery and equipment
               Plant management
               Plant services and utilities
               Plant maintenance
               Quality control at all stages


                                    63





Confidential   treatment   requested  by   Bristol-Myers   Squibb  Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


               Freight and storage costs at all stages
               Cost accounting and data processing services
               Any taxes and duties other than VAT and income tax

     (b) For the Processing of API into Finished Product:


     Cost of Raw Materials

          The purchase unit cost of any materials and packaging  components
     necessary to make the finished goods (including,  without  limitation,
     the  API)   multiplied  by  the  actual   quantity   consumed  in  the
     manufacturing  process including any usage variance and any write-offs
     caused by obsolescence, accident and book-to-physical differences.

     Direct Labor and Overhead Costs

          The cost of direct labor and overhead  resources  consumed in the
     manufacturing process.

          Such costs will  include any  efficiency,  activity  and spending
     variances from standards as well as any unabsorbed  overhead  expenses
     caused by the start up of the dedicated manufacturing operation and/or
     by the  evolution  of the  Product  sales  volume in North  America or
     Japan, as the case may be.

          The manufacturing overhead will include:

               The normal depreciation of fixed assets
               The plant management
               The plant common services and utilities
               The plant maintenance
               The quality control at all stages
               The freight and storage costs at all stages
               The cost accounting and data processing services
               Any taxes and duties other than VAT and income tax

     "General  and  Administrative  Costs"  means costs  chargeable  to the
Products  relating to Product  sales efforts of a Party in Japan equal to a
portion of Net Sales set by the Finance  Committee.  The Finance  Committee
shall   determine   such   portion  by   calculating   ERS's   general  and
administrative cost budget relating to Japan [**].

     "Gross  Profit"  means Net Sales in Japan  less Cost of Goods  Sold in
Japan, for sales of Product by any Party to Third Parties in Japan.

     "Marketing Costs"


                                    64





Confidential   treatment   requested  by   Bristol-Myers   Squibb  Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


     For purposes of this  definition of Marketing  Costs,  the "Applicable
Region" shall mean (i) Japan,  when "Marketing  Costs" is used in reference
to payments that are to be made in connection  with Product sales in Japan,
or (ii) the Territory,  when "Marketing  Costs" is used in reference to the
Marketing Budget.

     (a) "Marketing  Costs" means the direct or accrued costs of marketing,
promotion,   advertising,   Product  promotional  materials,   professional
education,  product related public  relations,  relationships  with opinion
leaders  and  professional  societies,  market  research  (before and after
product approval), healthcare economics studies, post-marketing studies not
required to  maintain  product  approvals,  and other  similar  activities,
relating to Product sales efforts of a Party in the  Applicable  Region and
approved by the JCC. Such costs of a Party will include [**].

     (b)  "Marketing  Costs"  shall  also  include,   without   limitation,
activities related to [**].

     (c)  "Marketing  Costs"  will   specifically   exclude  the  costs  of
activities which [**].

     "Net Sales" means the gross amount  invoiced for sales of a Product by
ERS or its Affiliates,  in arm's length sales to Third Parties,  commencing
with the First  Commercial  Sale,  less the following  deductions from such
gross amounts which are actually incurred, allowed, accrued or specifically
allocated (ERS shall use commercially  reasonable efforts to reconcile such
amounts invoiced and deducted annually):

     (a) credits or allowances for damaged products,  returns or rejections
of Products and price adjustments;

     (b)  normal  and  customary  trade,   cash  and  quantity   discounts,
allowances  and  credits;

     (c)  chargeback  payments  and  rebates  (or the  equivalent  thereof)
granted   to   managed   health   care   organizations   or   to   federal,
state/provincial, local and other governments, including their agencies, or
to trade customers;

     (d) any  invoiced  freight,  postage,  shipping,  insurance  and other
transportation  charges  (excluding  such  charges  that  are  included  in
Distribution  Costs);  and

     (e) sales,  value-added  (to the extent not  refundable  in accordance
with applicable law), and excise taxes, tariffs and duties, and other taxes
directly  related to the sale (but not including taxes assessed against the
income derived from such sale).

     Net Sales shall not include  sales among ERS and its  Affiliates,  but
shall  arise  upon the sale by ERS or its  Affiliates  to  unrelated  Third
Parties,  such as end users,  wholesalers and retailers.  Net Sales, as set
forth in this definition,  shall be calculated applying, in accordance with
GAAP, the standard  accounting  practices ERS customarily  applies to other
products sold by it.

     "Operating  Profit or Loss"  means Net Sales in Japan of all  Products
less the  following  items with  respect to each  Product  sold in Japan or
relating  to Product  sales  efforts  of a Party in Japan,  all for a given
period: [**].

     "Other  Operating  Income/Expense"  means  other  operating  income or
expense from or to


                                    65





Confidential   treatment   requested  by   Bristol-Myers   Squibb  Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


Third Parties,  relating to the manufacture or sales of Products by a Party
in Japan or Product sales efforts of a Party in Japan, which is not part of
the primary  business  activity  being  conducted by the Parties under this
Agreement,  but is considered and approved by the Finance  Committee or the
JEC as income or expense for  purposes of this  activity  and is limited to
the following,  each of which is to be related to  manufacturing or selling
Products by a Party in Japan or Product sales efforts of a Party in Japan:

                                    [**]

The  methodology  used to determine the amount of each item set forth above
shall be developed by the Finance Committee.

     "Sales Costs" means costs,  including Allocable Overhead,  approved by
the JCC with the  Marketing  Budgets,  incurred by the Parties or for their
account and  specifically  identifiable to the sales efforts of Products to
all markets in North  America or Japan,  as the case may be,  including the
managed care market.

     (a) "Sales Costs" shall include, without limitation,  costs associated
with sales  representatives  for Products in North America or Japan, as the
case may be, including compensation,  benefits and travel,  supervision and
training of such sales  representatives,  sales  meetings,  and other sales
related expenses.

     (b) "Sales Costs" will not include the start-up costs  associated with
any Party's  sales force  relating to that Party's  sales  efforts in North
America or Japan, as the case may be, including recruiting,  relocation and
other similar  costs.  the  Company's  sales costs shall not be included in
profit/loss calculations.


                                    66





Confidential   treatment   requested  by   Bristol-Myers   Squibb  Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


                                 Exhibit 1.68

                             LOW CASE PROJECTIONS

See the attached tables.


                                    67








                                                                                                Exhibit 1.68 Low Case Projections

Project ICE
C225 Sales Summary
United States & Japan
$Millions


                                                                              

Low Case              2002   2003   2004   2005   2006   2007   2008   2009   2010   2011   2012   2013   2014   2015   2016  2017
                      ----   ----   ----   ----   ----   ----   ----   ----   ----   ----   ----   ----   ----   ----   ----  ----
United States         [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]  [**]
  - % change          [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]  [**]

Japan (50%)           [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]  [**]
  - % change          [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]  [**]
----------------------------------------------------------------------------------------------------------------------------------

Total                 [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]  [**]
  - % change          [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]  [**]




[**]





Confidential   treatment   requested  by   Bristol-Myers   Squibb  Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


Exhibit 1.87

                                  PATENTS

TITLE:            Hybrid Cell Lines That Produce Monoclonal Antibodies to
                  Epidermal Growth Factor Receptor
INVENTOR(S):      Mendelsohn et al.
US PATENT NO.:    4,943,533
PRIORITY DATE:    March 9, 1987


TITLE:            Monoclonal Antibodies Specific to Human Epidermal Growth
                  Factor Receptor and Therapeutic Methods of Employing Same
INVENTOR(S):      Schlessinger et al.
US PATENT NO.:    6,217,866
PRIORITY DATE:    September 15, 1988
CA  PATENT NO:    1,340,417
JP SERIAL NO:     237397/1989


TITLE:            Antibody and Antibody Fragments for Inhibiting the
                  Growth of Tumors
INVENTOR(S):      Goldstein et al.
US SERIAL NO.:    08/973,065
PRIORITY DATE:    June 7, 1995
CA SERIAL NO:     2,222,231
JP SERIAL NO:     9-502046


TITLE:            Treatment of Human Tumors with Radiation and Inhibitors of
                  Growth Factor Receptor Tyrosine Kinases
INVENTOR(S):      Waksal et al.
US SERIAL NO.:    09/312,286
PRIORITY DATE:    May 15, 1998
CA SERIAL NO:     2,332,331
JP SERIAL NO:     2000-549641


TITLE:            Treatment of Refractory Human Tumors with Epidermal Growth
                  Factor Receptor Antagonists
INVENTOR(S):      Harlan W. Waksal
US SERIAL NOS.:   09/374,028; 09/840,146
PRIORITY DATE:    May 14, 1999
PCT APPL:         PCT/US00/11756
PCT FILED:        May 1, 2000, to be nationalized in Canada and Japan
                  November 14, 2001


                                    68





Confidential   treatment   requested  by   Bristol-Myers   Squibb  Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


                                  Exhibit 2.1

                JOINT EXECUTIVE COMMITTEE AND ALLIANCE MANAGERS

Initial Joint Executive Committee Members Designated by BMS:

         [**]

Initial Alliance Manager Designated by BMS and ERS:

         [**]

Initial Joint Executive Committee Members Designated by the Company:

         [**]

Initial Alliance Manager Designated by the Company:

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


                                    69





Confidential   treatment   requested  by   Bristol-Myers   Squibb  Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


                              Exhibit 4.3(A)

                              CLINICAL BUDGET

See the attached tables.


                                    70








                                                                                                       Exhibit 4.3A Clinical Budget


PROJECT ICE
CLINICAL SPENDING
$MILLIONS

                                                                        
                        2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  Total
                        ----  ----  ----  ----  ----  ----  ----  ----  ----  ----  ----  ----  ----  ----  ----  ----  ----  -----
                        [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]
REGISTRATIONAL STUDIES  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]
(PRECLINICAL TO
PHASE III)
  U.S.                  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]
  Japan                 [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]



NON-REGISTRATIONAL
STUDIES                 [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]
(PHASE IV)
  U.S.                  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]
  Japan                 [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]  [**]









Confidential   treatment   requested  by   Bristol-Myers   Squibb  Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


                                Exhibit 4.3(B)

                SUMMARY CLINICAL DEVELOPMENT PLAN FOR 2001-2004


                                    71





                             Exhibit 4.3B Summary Clinical Development Plan


PRI
CLINICAL DEVELOPMENT PLAN - C225
-----------------------------------------------------------------------------

  Studies                             Patients         Start         End
  -------                             --------         -----         ---

  [**]                                [**]              [**]         [**]









Confidential   treatment   requested  by   Bristol-Myers   Squibb  Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


                                Exhibit 5.2(A)

                        MARKETING BUDGET FOR 2001-2004

See the attached tables.





                                                 Exhibit 5.2A Marketing Budget


          PROJECT ICE - MARKETING BUDGET FOR 2001-2004
          BASE CASE DME SPENDING
          $Millions

                                             2001    2002   2003   2004
                                             ----    ----   ----   ----

          TOTAL A&P                          [**]    [**]   [**]   [**]
             U.S.                            [**]    [**]   [**]   [**]
             Japan                           [**]    [**]   [**]   [**]

          DISTRIBUTION & OTHER FEES          [**]    [**]   [**]   [**]

          TOTAL SALES FORCE(1)               [**]    [**]   [**]   [**]
             U.S.                            [**]    [**]   [**]   [**]
             Japan                           [**]    [**]   [**]   [**]
          # Reps                             [**]    [**]   [**]   [**]



[**]






Confidential   treatment   requested  by   Bristol-Myers   Squibb  Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.



Exhibit 5.2(B)

                   INDICATIVE MARKETING BUDGET FOR 2005-2017


                                    73







                                                                                      Exhibit 5.2B Indicative Marketing Budget

PROJECT ICE - INDICATIVE MARKETING BUDGET FOR 2005-2017
BASE CASE DME SPENDING
$Millions
                                                                             

                                2005   2006   2007   2008   2009   2010   2011   2012   2013   2014   2015   2016   2017
                                ----   ----   ----   ----   ----   ----   ----   ----   ----   ----   ----   ----   ----

TOTAL A&P                       [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]
   U.S.                         [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]
   Japan                        [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]

DISTRIBUTION & Other Fees       [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]

TOTAL SALES FORCE(1)            [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]
   U.S.                         [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]
   Japan                        [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]
# Reps                          [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]



[**]





Confidential   treatment   requested  by   Bristol-Myers   Squibb  Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


                              Exhibit 8.12(B)(i)

                       BASE CASE CLINICAL SUPPLY AMOUNT


                                    74








                                                                                               Exhibit 8.12(B)(i)

C225 VOLUME NEED FOR CLINICAL PLAN
------------------------------------------------------------------------------------------------------------------
Kilograms

                                                           Year
------------------------------------------------------------------------------------------------------------------
                                                                                  
                            2001      2002      2003      2004      2005       2006      2007      2008      Total

US/EU   Total - US/EU       [**]      [**]      [**]      [**]      [**]       [**]      [**]      [**]      [**]

JAPAN   Total - Japan       [**]      [**]      [**]      [**]      [**]       [**]      [**]      [**]      [**]
        --------------
        GRAND TOTAL (kgs)   [**]      [**]      [**]      [**]      [**]       [**]      [**]      [**]      [**]










Confidential   treatment   requested  by   Bristol-Myers   Squibb  Company,
Bristol-Myers Squibb Biologics Company and ImClone Systems Incorporated.


                              Exhibit 8.12(B)(ii)

                      BASE CASE COMMERCIAL SUPPLY AMOUNT


                                    75








                                                                                                               Exhibit 8.12(B)(ii)

PROJECT ICE
C225 COMMERCIAL VOLUME SUMMARY
UNITED STATES & JAPAN
Kilograms

                                                                            
-----------------------------------------------------------------------------------------------------------------------------------
BASE CASE            2002   2003   2004   2005   2006   2007   2008   2009   2010   2011   2012   2013   2014   2015   2016    2017
---------            ----   ----   ----   ----   ----   ----   ----   ----   ----   ----   ----   ----   ----   ----   ----    ----
UNITED STATES  [**]  [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]    [**]
               [**]  [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]    [**]

JAPAN          [**]  [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]    [**]
               [**]  [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]    [**]


TOTAL          [**]  [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]    [**]
               [**]  [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]   [**]    [**]


NOTES:

       [**]