ILEX ONCOLOGY INC
8-K/A, 1999-09-21
MEDICAL LABORATORIES
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<PAGE>   1



                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

                                   FORM 8-K/A

                                 CURRENT REPORT



  Filed Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934


         Date of Report (Date of earliest event reported)     July 16, 1999
                                                         -----------------------


                               ILEX ONCOLOGY, INC.
             ------------------------------------------------------
             (Exact name of registrant as specified in its charter)



          Delaware                      0-23413                  94-3123681
- --------------------------------------------------------------------------------
(State or other jurisdiction    (Commission File Number)      (I.R.S. Employer
      of incorporation)                                      Identification No.)



11550 IH-10 West, Suite 100 San Antonio, Texas                     78230
- --------------------------------------------------------------------------------
(Address of principal executive offices)                         (Zip Code)




Registrant's telephone number, including area code       210-949-8200
                                                  ------------------------------




- --------------------------------------------------------------------------------
          (Former name or former address, if changed since last report)


<PAGE>   2


Item 1.       Changes in Control of Registrant.
              ---------------------------------

              Not Applicable.

Item 2.       Acquisition or Disposition of Assets.
              -------------------------------------

              On July 16, 1999, the Company, its wholly owned subsidiary, ILEX
              Products, Inc., a Delaware corporation ("Products"), and ILEX
              Acquisition Inc., a Delaware corporation ("Purchaser"), and wholly
              owned subsidiary of Products, entered into a Plan of Merger and
              Acquisition Agreement (the Acquisition Agreement) with (i)
              Convergence Pharmaceuticals, Inc., a Delaware corporation
              ("Convergence"), and (ii) Vikas Sukhatme, Raghuram Kalluri, Ralph
              Weichselbaum, Donald Kufe, Glenn C. Rice and Tsuneya Ohno
              (collectively, "the Shareholders"). Convergence, headquartered in
              Boston, Massachusetts, was a privately held, research-based
              pharmaceutical company with an emerging portfolio of angiogenisis
              and DNA repair inhibitors. Under the terms of the Acquisition
              Agreement, the Company acquired all of the issued and outstanding
              shares of capital stock of Convergence ("Convergence Stock") in
              exchange for 1,000,000 shares of common stock, $.01 par value, of
              the Company ("ILEX Common Stock"). The Company also agreed to
              issue up to an aggregate of 1,000,000 shares of ILEX Common Stock
              to the holders of Convergence Stock upon achievement of certain
              milestones. In addition, the Company issued options to purchase
              50,000 shares of ILEX Common Stock to Glenn C. Rice and options to
              purchase 25,000 shares of ILEX Common Stock to each of the other
              Shareholders.

              The acquisition was consummated on July 16, 1999, pursuant to the
              terms of the Acquisition Agreement, upon (i) filing of the
              Certificate of Merger with the Secretary of State of the State of
              Delaware, pursuant to which Convergence merged with and into
              Purchaser with Purchaser as the surviving corporation to such
              merger and (ii) issuance by the Company of an aggregate of
              1,000,000 shares of ILEX Common Stock to the shareholders of
              Convergence. The amount paid by the Company for the Convergence
              Stock was arrived at through negotiations between the Company, the
              Shareholders and Convergence and was based on a variety of
              factors, including, but not limited to, the prospect for
              commercializing certain of the assets of Convergence and the
              nature of the research-based pharmaceutical industry. The
              acquisition will be accounted for using the purchase method of
              accounting. The Company has granted certain registration rights
              for the shares issued in connection with the acquisition. The
              Company entered into an employment agreement with Glenn C. Rice
              and consulting agreements with certain of the Shareholders in
              connection with this acquisition. Following the acquisition, Glenn
              C. Rice was elected as a director and a vice president of the
              Company.

Item 3.       Bankruptcy or Receivership.
              ---------------------------

              Not Applicable.

Item 4.       Changes in Registrant's Certifying Accountant.
              ----------------------------------------------

              Not Applicable.

Item 5.       Other Events.
              -------------

              On August 24, 1999, ILEX announced that L & I Partners, L.P., a
              joint venture which ILEX has with LeukoSite, Inc., entered into an
              agreement with Schering AG for the marketing and distribution of
              CAMPATH(TM) in the United States, Europe and the rest of the world
              except for most of East Asia (where LeukoSite and ILEX have
              retained rights). The Agreement is attached hereto as Exhibit 99.1
              and incorporated herein by reference. The foregoing description is
              qualified by reference to such exhibit.

                                       2
<PAGE>   3


Item 6.       Resignations of Registrant's Directors.
              ---------------------------------------

              Not Applicable.

Item 7.       Financial Statements and Exhibits.
              ----------------------------------

              (a)   Financial Statements of Businesses Acquired.
                    --------------------------------------------

                    Convergence Pharmaceuticals, Inc.
                    --------------------------------
<TABLE>
<CAPTION>
                                                                                           Page
                                                                                          Number
                                                                                          ------
                    <S>  <C>                                                              <C>
                    1.   Report of Independent Public Accountants                            5

                    2.   Balance Sheet As of December 31, 1998, and June 30, 1999            6

                    3.   Statements of Operations for the Period From
                           Inception (August 4, 1998) to December 31, 1998,
                           for the Six Months Ended June 30, 1999, and
                           Cumulative for the Period From Inception to June
                           30, 1999                                                          7

                   4.    Statements of Stockholders' Equity for the Period From
                           Inception (August 4, 1998) to June 30, 1999                       8

                   5.    Statements of Cash Flows for the Period From Inception
                           (August 4, 1998) to June 30, 1999, and Cumulative for
                           the Period From Inception to June 30, 1999                        9

                   6.    Notes to Financial Statements                                      10
</TABLE>

              (b)   Pro Forma Financial Information.
                    --------------------------------
<TABLE>
<CAPTION>
                                                                                           Page
                                                                                          Number
                                                                                          ------
                    <S>  <C>                                                              <C>
                    1.   Pro Forma Condensed Consolidated Financial Statements
                           Introduction                                                     13

                    2.   Pro Forma Condensed Consolidated Balance Sheet as of
                           June 30, 1999                                                  14 - 15

                    3.   Pro Forma Condensed Consolidated Statements of
                           Operations for the Year Ended December 31, 1998, and
                           the Six Months Ended June 30, 1999                             16 - 17

                    4.   Notes to Pro Forma Condensed Consolidated Financial
                           Statements                                                       18
</TABLE>






                                       3

<PAGE>   4


              (c)   Exhibit Index.
                    --------------

<TABLE>
<CAPTION>
                      Exhibit
                       Number                     Identification of Exhibit
                      -------                     -------------------------
                      <S>                  <C>
                         2.1             Plan of Merger and Acquisition
                                           Agreement dated July 16, 1999, by and
                                           among ILEX Oncology, Inc., ILEX
                                           Acquisition Inc., Convergence
                                           Pharmaceuticals, Inc., Vikas Sukhatme,
                                           Raghuram Kalluri, Ralph Weichselbaum,
                                           Donald Kufe, Glenn C. Rice and
                                           Tsuneya Ohno (incorporated by
                                           reference to Exhibit 2.1 to the
                                           Company's Current Report on Form 8-K
                                           filed July 30, 1999)

                        10.1             Employment agreements dated July 16, 1999,
                                           by and between ILEX Products, Inc., and
                                           Glenn C. Rice (incorporated by reference
                                           to Exhibit 10.1 to the Company's Current
                                           Report on Form 8-K filed July 30, 1999)

                        10.2             Registration Rights Agreement dated
                                           July 16, 1999, among ILEX Oncology,
                                           Inc., Vikas Sukhatme, Raghuram
                                           Kalluri, Ralph Weichselbaum, Donald
                                           Kufe, Glenn C. Rice, Tsuneya Ohno,
                                           Stephan Dolezalek, Beth Israel
                                           Deaconess Medical Center and Arch
                                           Development Corporation (incorporated
                                           by reference to Exhibit 10.2 to the
                                           Company's Current Report on Form 8-K
                                           filed July 30, 1999)

                        99.1*            Distribution and Development
                                           Agreement between L & I Partners,
                                           L.P., and Schering AG, dated August
                                           24, 1999 (filed herewith)

                               *  Confidential treatment has been requested with
                                  respect to certain portions of this document.
                                  Such portions have been omitted and have been
                                  filed separately with the Commission.
</TABLE>


Item 8.       Change in Fiscal Year.
              ----------------------

              Not applicable.


                                       4
<PAGE>   5








                      REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS





To Convergence Pharmaceuticals, Inc.:

We have audited the accompanying balance sheets of Convergence Pharmaceuticals,
Inc. (a Delaware corporation in the development stage), as of December 31, 1998,
and the related statements of operations, stockholders' equity and cash flows
for the period from inception (August 4, 1998) to December 31, 1998. These
financial statements are the responsibility of the Company's management. Our
responsibility is to express an opinion on these financial statements based on
our audit.

We conducted our audit in accordance with generally accepted auditing standards.
Those standards require that we plan and perform the audit to obtain reasonable
assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audit provides a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in
all material respects, the financial position of Convergence Pharmaceuticals,
Inc., as of December 31, 1998, and the results of its operations and its cash
flows for the period from inception to December 31, 1998, in conformity with
generally accepted accounting principles.


                                                      /s/ Arthur Andersen LLP
San Antonio, Texas
August 13, 1999


                                       5
<PAGE>   6


                       CONVERGENCE PHARMACEUTICALS, INC.
                       ---------------------------------

                         (A Development Stage Company)
                         -----------------------------

            BALANCE SHEET AS OF DECEMBER 31, 1998 AND JUNE 30, 1999
            -------------------------------------------------------

                      (In Thousands, Except Share Amounts)

<TABLE>
<CAPTION>
                                                                                 December 31,   June 30,
                                                                                    1998          1999
                                                                                 ------------   --------
                                                                                              (Unaudited)
<S>                                                                                <C>          <C>

                                        ASSETS
                                        ------
CURRENT ASSETS:
   Cash and cash equivalents                                                       $  --        $   389
   Prepaid expenses and other current assets                                          --            177
                                                                                   -------      -------

                     Total current assets                                             --            566
                                                                                   -------      -------

PROPERTY AND EQUIPMENT                                                                --            387
   Less- Accumulated depreciation                                                     --            (24)
                                                                                   -------      -------
                     Total property and equipment                                     --            363
                                                                                   -------      -------
                     Total assets                                                  $  --        $   929
                                                                                   =======      =======

                         LIABILITIES AND STOCKHOLDERS' EQUITY
                         ------------------------------------
CURRENT LIABILITIES:
   Accounts payable                                                                $  --        $    99
   Accrued liabilities                                                                  10          666
   Current portion of convertible promissory note                                     --          1,000
                                                                                   -------      -------

                     Total current liabilities                                          10        1,765
                                                                                   -------      -------

COMMITMENTS AND CONTINGENCIES (Note 3)

STOCKHOLDERS' EQUITY:
   Preferred stock, 200,000 shares authorized, no shares issued or
     outstanding                                                                      --           --
   Common stock, $.001 par value; 10,000,000 shares authorized, no shares issued
     or outstanding; 809,550 shares to be issued at par value                            1            1
   Additional paid-in capital                                                           (1)          (1)
   Deficit accumulated during the development stage                                    (10)        (836)
                                                                                   -------      -------

                     Total stockholders' equity                                        (10)        (836)
                                                                                   -------      -------

                     Total liabilities and stockholders' equity                    $  --        $   929
                                                                                   =======      =======
</TABLE>




   The accompanying notes are an integral part of these financial statements.

                                       6
<PAGE>   7


                       CONVERGENCE PHARMACEUTICALS, INC.
                       ---------------------------------

                          (A Development Stage Company)
                          -----------------------------

                            STATEMENTS OF OPERATIONS
                            ------------------------

                 FOR THE PERIOD FROM INCEPTION (AUGUST 4, 1998)
                 ----------------------------------------------

          TO DECEMBER 31, 1998, FOR THE SIX MONTHS ENDED JUNE 30, 1999
          ------------------------------------------------------------

          AND CUMULATIVE FOR THE PERIOD FROM INCEPTION TO JUNE 30, 1999
          -------------------------------------------------------------

                                 (In Thousands)

<TABLE>
<CAPTION>
                                             For the                     Cumulative
                                            Period From   For the Six  for the Period
                                             Inception       Months         From
                                         (August 4, 1998)    Ended        Inception
                                          to December 31,   June 30,     to June 30,
                                               1998           1999          1999
                                         ---------------- -----------  --------------
                                                          (Unaudited)   (Unaudited)
<S>                                           <C>            <C>           <C>
REVENUE                                       $--            $--           $--
                                              -----          -----         -----

                   Total revenue               --             --            --
                                              -----          -----         -----

OPERATING EXPENSES:

   Research development                        --              290           290
   General and administrative                    10            506           516
   Direct cost of research services            --               17            17
                                              -----          -----         -----

                   Total operating expenses      10            813           823
                                              -----          -----         -----

OPERATING LOSS                                  (10)          (813)         (823)

INTEREST EXPENSE, net                          --               13            13
                                              -----          -----         -----

NET LOSS                                      $ (10)         $(826)        $(836)
                                              =====          =====         =====
</TABLE>



   The accompanying notes are an integral part of these financial statements.


                                       7
<PAGE>   8


                       CONVERGENCE PHARMACEUTICALS, INC.
                       ---------------------------------

                         (A Development Stage Company)
                         -----------------------------

                       STATEMENTS OF STOCKHOLDERS' EQUITY
                       ----------------------------------

        FOR THE PERIOD FROM INCEPTION (AUGUST 4, 1998) TO JUNE 30, 1999
        ---------------------------------------------------------------

                                 (In Thousands)

<TABLE>
<CAPTION>

                                                            Common Stock                         Deficit
                                                       ----------------------                  Accumulated        Total
                                                        Issued and               Additional     During the     Stockholders'
                                                       Outstanding  $.001 Par      Paid-In      Development       Equity
                                                         Shares       Value        Capital         Stage        (Deficit)
                                                       -----------  ---------    ----------    ------------    -------------
<S>                                                       <C>         <C>           <C>            <C>            <C>
BALANCE, inception (August 4, 1998)                       --          $--           $--            $--            $--

STOCK SUBSCRIBED TO FOUNDERS                              --              1            (1)          --             --

NET LOSS                                                  --           --            --              (10)           (10)
                                                          ----        -----         -----          -----          -----

BALANCE, December 31, 1998                                --              1            (1)           (10)           (10)

NET LOSS FOR THE PERIOD ENDED JUNE 30, 1999 (Unaudited)   --           --            --             (826)          (826)
                                                          ----        -----         -----          -----          -----

BALANCE, June 30, 1999 (Unaudited)                        --          $   1         $  (1)         $(836)         $(836)
                                                          ====        =====         =====          =====          =====
</TABLE>




   The accompanying notes are an integral part of these financial statements.


                                       8
<PAGE>   9


                       CONVERGENCE PHARMACEUTICALS, INC.
                       ---------------------------------

                         (A Development Stage Company)
                         -----------------------------

                            STATEMENTS OF CASH FLOWS
                            ------------------------

                 FOR THE PERIOD FROM INCEPTION (AUGUST 4, 1998)
                 ----------------------------------------------

                TO JUNE 30, 1999, AND CUMULATIVE FOR THE PERIOD
                -----------------------------------------------

                        FROM INCEPTION TO JUNE 30, 1999
                        -------------------------------

                                 (In Thousands)

<TABLE>
<CAPTION>
                                                                                                    Cumulative
                                                                                     For the Six      for the
                                                                         For the       Months       Period From
                                                                        Year Ended     Ended       Inception to
                                                                       December 31,   June 30,       June 30,
                                                                          1998          1999           1999
                                                                       ------------  -----------   ------------
                                                                                     (Unaudited)    (Unaudited)
<S>                                                                      <C>          <C>            <C>
OPERATING ACTIVITIES:
   Net loss                                                              $   (10)     $  (826)       $  (836)
   Adjustments to reconcile net loss to net cash used in operating
     activities-
       Depreciation and amortization                                        --             23             23
       Increase in-
         Prepaid and other assets                                           --           (177)          (177)
         Accounts payable                                                   --             99             99
         Accrued liabilities                                                  10          350            360
                                                                         -------      -------        -------

             Net cash used in operating activities                          --           (531)          (531)
                                                                         -------      -------        -------

INVESTING ACTIVITIES:
   Purchase of Nissin                                                       --            (80)           (80)
                                                                         -------      -------        -------

             Net cash used in investing activities                          --            (80)           (80)
                                                                         -------      -------        -------

FINANCING ACTIVITIES:
   Borrowings of debt                                                       --          1,000          1,000
                                                                         -------      -------        -------

             Net cash provided by financing activities                      --          1,000          1,000
                                                                         -------      -------        -------

NET INCREASE IN CASH AND CASH EQUIVALENTS                                   --            389            389

CASH AND CASH EQUIVALENTS, beginning of period                              --           --             --
                                                                         -------      -------        -------

CASH AND CASH EQUIVALENTS, end of period                                 $  --        $   389        $   389
                                                                         =======      =======        =======

SUPPLEMENTAL DISCLOSURE OF NONCASH FINANCING AND INVESTING ACTIVITIES:
     Net assets acquired in connection with acquisition                  $  --        $    80        $    80
                                                                         =======      =======        =======

     Common stock issued at inception                                    $     1      $  --          $     1
                                                                         =======      =======        =======
</TABLE>



   The accompanying notes are an integral part of these financial statements.


                                       9
<PAGE>   10


                       CONVERGENCE PHARMACEUTICALS, INC.
                       ---------------------------------

                         NOTES TO FINANCIAL STATEMENTS
                         -----------------------------

                               DECEMBER 31, 1998
                               -----------------

                (All Amounts In Thousands, Except Share Amounts)


1.   ORGANIZATION AND DESCRIPTION
     OF THE COMPANY:
     ----------------------------

The Company was incorporated on August 4, 1998, as Convergence Pharmaceuticals,
Inc. (Convergence or the Company). From inception through June 1999, the
Company's operations were nominal. On April 1, 1999, Convergence paid $80 for
all the outstanding stock of Nissin Molecular Biological Institute (Nissin).
This business combination was accounted for as a purchase (see Note 7).

Convergence is a biopharmaceutical company focused on the treatment of
oncongenic disease through the development of novel therapeutics. Convergence is
in the business of obtaining, developing and marketing certain intellectual
property in the areas of angiogenesis, cancer drug and radiation sensitizers and
chemotherapeutic agents. Convergence's product candidate portfolio includes six
proprietary antiangiogenic proteins and certain Collagen XVIII derivatives which
have shown significant antitumor activity in preclinical cancer models.
Additionally, Convergence has a license for an orally active small molecule
antiangiogenic drug and licensed technologies involving certain DNA repair
targets and lead molecule candidates.

Convergence is in the development stage and has not yet generated significant
operating revenues nor is there any assurance of future revenues. Convergence
continues to be subject to the risks and challenges associated with other
companies in a comparable stage of development including the ability to obtain
adequate financing to fund operations and development, dependence on key
individuals and entities, competition from larger companies and successful
development and marketing of its products. Accordingly, the Company's long-term
future success is uncertain. ILEX Oncology, Inc. (ILEX), the parent of
Convergence as of July 16, 1999 (see Note 8), has committed to providing
necessary financing to Convergence through January 1, 2000, to enable it to
sustain its planned activities.

2.   SUMMARY OF SIGNIFICANT
     ACCOUNTING POLICIES:
     ----------------------

Cash and Cash Equivalents
- -------------------------

The Company considers all highly liquid investments with maturities of 90 days
or less to be cash equivalents.

Fixed Assets and Depreciation
- -----------------------------

Fixed assets are recorded at cost less accumulated depreciation. Depreciation is
provided utilizing the straight-line method over the estimated useful life of
the asset. Additions and improvements that extend the useful life of the asset
are capitalized. Upon sales or retirement of property and equipment, the related
cost and accumulated depreciation are eliminated from the accounts and the
resulting gain or loss is recorded.



                                       10
<PAGE>   11


Income Taxes
- ------------

The Company has incurred losses since inception for both book and tax purposes.
Accordingly, no income taxes have been provided for in the financial statements
for the period from inception (August 4, 1998) to December 31, 1998, for the six
months ended June 30, 1999, and cumulative for the period from inception to June
30, 1999. Additionally, a valuation allowance has been recorded to offset
deferred tax assets, which represent tax benefits, primarily certain future net
operating loss carryforwards, which were not realizable at December 31, 1998,
and June 30, 1999.

Use of Estimates
- ----------------

The preparation of financial statements in conformity with generally accepted
accounting principles requires management to make estimates and assumptions that
affect the reported amounts of assets and liabilities and disclosure of
contingent assets and liabilities at the date of the financial statements and
the reported amounts of revenues and expenses during the reporting period.
Actual results may differ from those estimates.

3.   COMMITMENTS AND CONTINGENCIES:
     ------------------------------

In January 1999, Convergence entered into consulting arrangements with its four
founders to assist in marketing and raising capital on behalf of Convergence
during the development stage of the Company. This contract was terminated upon
the purchase of Convergence by ILEX (see Note 8).

Convergence leases its office space and research facilities. The lease expires
in July 1999, with a renewal option for two additional years ending in 2001.
Subsequent to June 1999, Convergence exercised the option for the full two
years. The fixed minimum rental commitment for the lease until July 2001, not
including real estate taxes and other maintenance costs relating to the lease
which are to be paid by the Company, is approximately $360.

4. LONG-TERM LIABILITIES:
   ----------------------

In February 1999, Convergence issued a $1,000 convertible promissory note
bearing interest at 5.51 percent. As of June 1999, Convergence had made no
principal or interest payments. Subsequent to the purchase of Convergence by
ILEX, the note was called and ILEX paid the principal sum of this note together
with the accrued interest.

5. STOCKHOLDERS' EQUITY:
   ---------------------

During the fourth quarter of 1998, the founders of Convergence committed to
purchase 809,550 shares of Convergence stock at par value. As of June 30, 1999,
the subscriptions receivable had not been funded and therefore the shares not
issued. Subsequent to this date the subscription receivables were funded by the
founders.

6.   RELATED PARTY:
     --------------

Convergence paid approximately $190 to the founders through June 30, 1999, for
scientific consulting services. The Company believes that such consulting costs
represent arm's-length charges for the services provided.

7.   ACQUISITION OF NISSIN:
     ----------------------

In April 1999, Convergence acquired all of the outstanding stock of Nissin for
cash consideration of $80. Convergence accounted for this business combination
as a purchase.


                                       11
<PAGE>   12


The following unaudited pro forma consolidated results of operations for the six
months ended June 30, 1999, reflect the acquisition as if it had occurred on
January 1, 1999.

                         Revenue                     $ -
                         Net loss                    (1,279)

8.   MERGER AND ACQUISITION:
     -----------------------

On July 16, 1999, ILEX and Convergence entered into a Plan of Merger and
Acquisition Agreement (the Agreement) whereby Convergence was merged with and
into ILEX, with ILEX as the surviving corporation. ILEX accounted for this
business combination as a purchase. ILEX issued 1,000,000 shares of ILEX common
stock to the selling stockholders of Convergence, 40,000 of which were pledged
by the selling stockholders to secure indemnification obligations. Additionally,
ILEX assumed $1,000 of debt and $25 in accrued interest (see Note 4).

As additional consideration, 1,000,000 shares will be paid out in two equal
increments of 500,000 shares if two milestones are achieved. The first milestone
is defined as the initiation of treatment of the first patient following
initiation of a Phase I trial in the United States or Europe, which must occur
no later than December 31, 2001. The second milestone is defined as the
initiation of treatment of the first patient following initiation of a Phase II
trial in the United States or Europe, which must occur no later than December
31, 2002.

Concurrently with the Agreement, ILEX terminated the prior consulting agreements
with the four founders, agreed to pay the founders $50 each and entered into
four new agreements with the founders that included annual compensation for each
individual of $50 per year over a five-year period. The annual compensation per
founder for years two through five will be increased to the amounts below upon
the achievement of the first milestone, as previously defined, as follows:

                              Year        Annual Compensation
                              ----        -------------------
                               2                 $  75
                               3                   100
                               4                   125
                               5                   125

Additionally, ILEX granted to the selling stockholders the option to purchase a
cumulative of 100,000 shares of ILEX's common stock at an option price of $9.94.
The option vests at the rate of 25 percent per year beginning in July 2000 and
is immediately exercisable upon the occurrence of a change in control of ILEX,
as defined in the option agreement.


                                       12
<PAGE>   13




                               ILEX ONCOLOGY, INC.
                               -------------------

                        PRO FORMA CONDENSED CONSOLIDATED
                        --------------------------------

                              FINANCIAL STATEMENTS
                              --------------------

                                DECEMBER 31, 1998
                                -----------------

                                   (Unaudited)
                                   -----------

INTRODUCTION
- ------------

The following unaudited pro forma condensed consolidated financial statements
include the accounts of ILEX Oncology, Inc. (the Company, a Delaware
corporation), and Convergence Pharmaceuticals, Inc. (Convergence, a Delaware
corporation). All significant intercompany accounts and transactions have been
eliminated in consolidation. The pro forma condensed consolidated financial
statements of the Company have been adjusted to reflect the effects of the
Company's acquisition of Convergence. Under the terms of the Plan of Merger and
Acquisition Agreement (Agreement) by and between the Company and Convergence,
Convergence was acquired (Acquisition) through the issuance of one million
shares of the Company common stock valued at approximately $9.9 million. The
Acquisition was recorded using the purchase method of accounting.

The ILEX and Convergence columns in the following pro forma condensed
consolidated financial statements reflect the preacquisition historical
financial statements. The unaudited pro forma condensed consolidated balance
sheet assumes the Acquisition occurred on June 30, 1999. The unaudited pro forma
condensed consolidated statement of operations for the year ended December 31,
1998, assumes the Acquisition occurred on August 4, 1998, the date of inception
of Convergence. The unaudited pro forma condensed consolidated statement of
operations for the six months ended June 30, 1999, assumes the Acquisition
occurred on January 1, 1999. In the opinion of management of the Company, all
adjustments necessary to present fairly the unaudited pro forma condensed
consolidated financial statements have been made.

These unaudited pro forma condensed consolidated financial statements should be
read in conjunction with the Company's historical financial statements and notes
thereto included in the Company's Annual Report on Form 10-K for the fiscal year
ended December 31, 1998.



                                       13
<PAGE>   14
                               ILEX ONCOLOGY, INC.
                               -------------------

                 PRO FORMA CONDENSED CONSOLIDATED BALANCE SHEET
                 ----------------------------------------------

                                  JUNE 30, 1999
                                  -------------

                                   (Unaudited)
                                   -----------

                                 (In Thousands)

<TABLE>
<CAPTION>
                                                     June 30, 1999
                                               --------------------------
                                                 ILEX       Convergence                       Final
                                               Oncology,  Pharmaceuticals,   Pro Forma    Consolidated,
                     ASSETS                      Inc.          Inc.         Adjustments   June 30, 1999
                     ------                    ---------  ----------------  -----------   -------------
<S>                                            <C>           <C>             <C>            <C>
CURRENT ASSETS:
   Cash and cash equivalents                   $  5,243      $    389        $ (1,025)(f)   $  4,607
   Investment in marketable securities            9,702          --              --            9,702
   Receivables, net of-
     Billed                                       3,209          --              --            3,209
     Unbilled                                     2,591          --              --            2,591
   Prepaid expenses and other current assets        664           177            --              841
                                               --------      --------        --------       --------

             Total current assets                21,409           566          (1,025)        20,950
                                               --------      --------        --------       --------

NONCURRENT ASSETS:
   Investment in marketable securities              275          --              --              275
   Investments in and advances to-
     Research and development partnerships        1,379          --              --            1,379
                                               --------      --------        --------       --------

             Total noncurrent assets              1,654          --              --            1,654
                                               --------      --------        --------       --------

PROPERTY AND EQUIPMENT                            6,285           387            --            6,672
   Less- Accumulated depreciation                (2,337)          (24)             24 (d)     (2,337)
                                               --------      --------        --------       --------

                                                  3,948           363              24          4,335
                                               --------      --------        --------       --------

             Total assets                      $ 27,011      $    929        $ (1,001)      $ 26,939
                                               ========      ========        ========       ========
</TABLE>




See accompanying notes to pro forma condensed consolidated financial statements.



                                       14
<PAGE>   15


                               ILEX ONCOLOGY, INC.
                               -------------------

                 PRO FORMA CONDENSED CONSOLIDATED BALANCE SHEET
                 ----------------------------------------------

                                  JUNE 30, 1999
                                  -------------

                                   (Unaudited)
                                   -----------

                                 (In Thousands)

<TABLE>
<CAPTION>
                                                         June 30, 1999
                                                   --------------------------
                                                     ILEX       Convergence                      Final
          LIABILITIES AND                          Oncology,  Pharmaceuticals,  Pro Forma     Consolidated,
        STOCKHOLDERS' EQUITY                         Inc.          Inc.        Adjustments    June 30, 1999
        --------------------                       --------   ---------------- -----------    -------------
<S>                                                <C>           <C>             <C>            <C>
CURRENT LIABILITIES:
   Accounts payable-
     Related parties                               $     58      $   --          $   --         $     58
     Other                                              859            99            --              958
   Accrued subcontractor costs-
     Related parties                                    549          --              --              549
     Other                                            2,066          --              --            2,066
   Accrued liabilities                                2,033           666             (25)(f)      2,674
   Deferred revenue                                   3,110          --              --            3,110
   Current portion of convertible promissory
     note                                              --           1,000          (1,000)(f)       --
                                                   --------      --------        --------       --------

   Total current liabilities                          8,675         1,765          (1,025)         9,415
                                                   --------      --------        --------       --------

OTHER LONG-TERM LIABILITIES                             491          --              --              491
                                                   --------      --------        --------       --------

COMMITMENTS AND CONTINGENCIES (Note 3)

STOCKHOLDERS' EQUITY:
   Preferred stock                                     --            --              --             --
   Common stock                                         136             1              10 (a)        146
                                                                                       (1)(g)
   Additional paid-in capital                        76,598            (1)          9,930 (a)     87,182
                                                                                        1 (g)
                                                                                      630 (e)
                                                                                       24 (d)
   Deferred compensation                               --            --              (630)(e)       (630)
   Accumulated deficit                              (58,372)         (836)        (10,776)(h)    (69,148)
                                                                                      836 (g)
   Less- Treasury stock, at cost                       (517)         --              --             (517)
                                                   --------      --------        --------       --------

   Total stockholders' equity                        17,845          (836)             24         17,033
                                                   --------      --------        --------       --------

   Total liabilities and stockholders' equity      $ 27,011      $    929        $ (1,001)      $ 26,939
                                                   ========      ========        ========       ========
</TABLE>




See accompanying notes to pro forma condensed consolidated financial statements.


                                       15
<PAGE>   16


                               ILEX ONCOLOGY, INC.
                               -------------------

            PRO FORMA CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS
            --------------------------------------------------------

                      FOR THE YEAR ENDED DECEMBER 31, 1998
                      ------------------------------------

                                   (Unaudited)
                                   -----------

                                 (In Thousands)

<TABLE>
<CAPTION>
                                                  Year Ended    Period Ended
                                                 December 31,   December 31,                     Final
                                                    1998,           1998,                    Consolidated,
                                                    ILEX         Convergence                  Year Ended
                                                  Oncology,    Pharmaceuticals,  Pro Forma   December 31,
                                                    Inc.            Inc.        Adjustments      1998
                                                 -----------   ---------------- -----------  -------------
<S>                                               <C>             <C>             <C>         <C>
REVENUE:
   Product development                            $  4,622        $   --          $   --       $  4,622
   Contract research services                        9,650            --              --          9,650
                                                  --------        --------        --------     --------

         Total revenue                              14,272            --              --         14,272
                                                  --------        --------        --------     --------

OPERATING EXPENSES:
   Research development                             15,509            --              --         15,509
   General and administrative                        6,534              10          83 (b)        6,776
                                                                                    83 (c)
                                                                                    66 (e)
   Direct cost of research services                  9,313            --              --          9,313
                                                  --------        --------        --------     --------

         Total operating expenses                   31,356              10             232       31,598
                                                  --------        --------        --------     --------

OPERATING LOSS                                     (17,084)            (10)           (232)     (17,326)

OTHER INCOME (EXPENSE), net:
   Equity in losses of-
     Research and development partnerships          (4,453)           --              --         (4,453)
     Contract research affiliate                    (1,541)           --              --         (1,541)
   Interest income, net                              1,850            --              --          1,850
                                                  --------        --------        --------     --------

NET LOSS                                          $(21,228)       $    (10)       $   (232)    $(21,470)
                                                  ========        ========        ========     ========

NET LOSS PER SHARE                                $  (1.71)                                    $  (1.67)
                                                  ========                                     ========

WEIGHTED AVERAGE NUMBER OF SHARES OF COMMON
   STOCK OUTSTANDING                                12,450                             417 (a)   12,867
                                                  ========                        ========     ========
</TABLE>




See accompanying notes to pro forma condensed consolidated financial statements.


                                       16
<PAGE>   17


                               ILEX ONCOLOGY, INC.
                               -------------------

            PRO FORMA CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS
            --------------------------------------------------------

                     FOR THE SIX MONTHS ENDED JUNE 30, 1999
                     --------------------------------------

                                   (Unaudited)
                                   -----------

                                 (In Thousands)

<TABLE>
<CAPTION>
                                                           Six Months
                                                       Ended June 30, 1999
                                                ------------------------------                             Final
                                                  ILEX          Convergence                            Consolidated,
                                                Oncology,     Pharmaceuticals,      Pro Forma        Six Months Ended
                                                  Inc.             Inc.            Adjustments         June 30, 1999
                                                ---------     ----------------     -----------       ----------------
<S>                                             <C>             <C>                 <C>                  <C>
REVENUE:
   Product development                          $   2,069       $    -              $  -                 $   2,069
   Contract research services                       5,567            -                 -                     5,567
                                                ---------       -----------         ---------            ---------

         Total revenue                              7,636            -                 -                     7,636
                                                ---------       -----------         ---------            ---------

OPERATING EXPENSES:

   Research and development costs                   7,496               290            -                     7,786
   General and administrative                       2,514               506               100 (b)            3,212
                                                                                           13 (c)
                                                                                           79 (e)
   Direct cost of research services                 6,175                17            -                     6,192
   Special charges                                 13,883            -                 -                    13,883
                                                ---------       -----------         ---------            ---------

         Total operating expenses                  30,068               813               192               31,073
                                                ---------       -----------         ---------            ---------

OPERATING LOSS                                    (22,432)             (813)             (192)             (23,437)

OTHER INCOME (EXPENSE), net:
   Equity in losses of-
     Research and development partnerships         (1,888)           -                 -                    (1,888)
     Contract research affiliate                   (3,310)           -                 -                    (3,310)
   Interest income (expense), net                     540               (13)               25 (f)              552
   Gain (loss) on sale of securities                    1            -                 -                         1
                                                ---------       -----------         ---------            ---------

NET LOSS                                        $ (27,089)      $      (826)        $    (167)           $ (28,082)
                                                =========       ===========         =========            =========

NET LOSS PER SHARE                              $   (2.11)                                               $   (2.03)
                                                =========                                                =========

WEIGHTED AVERAGE NUMBER OF SHARES OF COMMON
   STOCK OUTSTANDING                               12,829                               1,000 (a)           13,829
                                                =========                           =========            =========
</TABLE>




See accompanying notes to pro forma condensed consolidated financial statements.



                                       17
<PAGE>   18


                               ILEX ONCOLOGY, INC.
                               -------------------

         NOTES TO PRO FORMA CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
         --------------------------------------------------------------

                                DECEMBER 31, 1998
                                -----------------

                                   (Unaudited)
                                   -----------

                      (In Thousands, Except Share Amounts)

PRO FORMA CONDENSED CONSOLIDATED
BALANCE SHEET AND STATEMENTS OF
OPERATIONS ADJUSTMENTS:
- --------------------------------

    (a)  Represents fair value of 1,000,000 ILEX common shares, $.01 par value,
         given as consideration in the acquisition. For the year ended December
         31, 1998, the weighted average number of shares of common stock are
         reflected from the period of inception (August 4, 1998) of Convergence
         to year-end.

    (b)  Reflects pro rata consideration given to Convergence founders in
         relation to revised consulting agreements as part of the Acquisition.
         For the year ended December 31, 1998, these amounts are reflected from
         the period of inception (August 4, 1998) of Convergence to year-end.

    (c)  Reflects additional compensation paid to an officer of Convergence as
         part of the Agreement. For the year ended December 31, 1998, these
         amounts are reflected from the period of inception (August 4, 1998) of
         Convergence to year-end.

    (d)  Reflects the elimination of accumulated depreciation recorded by
         Convergence.

    (e)  Six hundred thirty thousand dollars represents the estimated fair value
         of 100,000 options issued pursuant to consulting agreements entered
         into with the former owners of Convergence. The fair value of the
         options was calculated by using an option pricing model which
         approximates the Black-Scholes option pricing model. Assumptions used
         included a market price per share of $9.94, an exercise price of $9.94
         per share, an expected term of 10 years, anticipated volatility of
         approximately 40 percent, anticipated annual rate of quarterly
         dividends of $0 and a risk free rate of return of approximately 6.5
         percent. At December 31, 1998, and June 30, 1999, pro forma
         amortization expense of this fair value is $66 and $79, respectively.

    (f)  Reflects repayment of $1.0 million convertible promissory note called
         by the noteholder at the date of acquisition, including accrued
         interest of $25.

    (g)  Reflects elimination of Convergence's equity accounts.

    (h)  Reflects in process research and development costs that were charged
         off at the date of acquisition. These nonrecurring charges which
         resulted directly from the acquisition are not included in the pro
         forma condensed consolidated statement of operations.


                                       18

<PAGE>   19


                                    SIGNATURE

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

                                         ILEX ONCOLOGY, INC.



                                         By /s/ Michael T. Dwyer
                                            -----------------------------------
                                            Michael T. Dwyer
                                            Vice President and Chief Financial
                                            Officer (Chief Financial and
                                            Accounting Officer)


DATE: September 21, 1999



                                       19

<PAGE>   1
                             CONFIDENTIAL TREATMENT

                                                                   EXHIBIT 99.1
                                                                TO FORM 8-K FOR
                                                            ILEX ONCOLOGY, INC.


                     DISTRIBUTION AND DEVELOPMENT AGREEMENT

         This Distribution and Development Agreement ("AGREEMENT") is entered
into as of August 24, 1999 (the "Effective Date") by and between L&I Partners,
L.P., a Delaware partnership, having its principal place of business at 11550
1H-10 West, Suite 100, San Antonio, Texas 78230 ("L&I") and with Schering AG a
German corporation, having a principal place of business at 13342 Berlin,
Germany (hereinafter "DISTRIBUTOR").

                                   WITNESSETH

         WHEREAS, the parties hereto desire that DISTRIBUTOR engage in the
distribution in the TERRITORY (as hereinafter defined) of the PRODUCT (as
hereinafter defined); and

         WHEREAS, L&I and DISTRIBUTOR desire to set forth in this AGREEMENT the
terms and conditions of such distribution.

         NOW, THEREFORE, the parties hereto agree as follows:


1.       DEFINITIONS

1.1      "AFFILIATE" shall mean with respect to a PARTY any corporation or
         other business entity that directly or indirectly controls, is
         controlled by, or is under common control with such PARTY. Control
         means ownership or other beneficial interest in fifty percent (50%) or
         more of the voting stock or other voting interest of a corporation or
         other business entity, or the power to direct or cause the direction
         of the management or policies of an entity. LEUKOSITE and ILEX are
         AFFILIATES of L&I as is any corporation or business entity that
         directly or indirectly controls, is controlled by, or is under common
         control with LEUKOSITE or ILEX.

1.2      "AGENCY" shall mean any governmental or regulatory authority in the
         TERRITORY responsible for granting approvals or registrations for
         marketing of PRODUCT in the TERRITORY.

1.3      "APLS" shall mean the Advertising and Promotional Labeling Staff (or
         successor unit) of the FDA's Center for Biologics Evaluation and
         Research.


<PAGE>   2


1.4      "APPROPRIATE PERCENTAGE" for PRODUCT for each INDICATION means:

         (i)      ****** of positive EARNINGS. (1)

         (ii)     ****** of negative EARNINGS.

1.5      "BERLEX" means DISTRIBUTOR'S US AFFILIATE, Berlex Laboratories, Inc.

1.6      "BI" shall mean Boehringer Ingelheim Pharma KG.

1.7      "BI AGREEMENT" shall mean the Supply Agreement between L&I and BI
         dated June 4th, 1999 with respect to CAMPATH 1H and any amendments
         thereto.

1.8      "BLA" means a Biologics License Application from the Food and Drug
         Administration.

1.9      "BTG" means British Technology Group Limited.

1.10     "BTG AGREEMENT" means the March 31, 1997 agreement between BTG and
         LEUKOSITE with respect to Campath I-H and any amendments thereto
         including but not limited to the Deed of Variation of Appendix I.

1.11     "BTG CONSENT LETTER" means the letter from BTG to DISTRIBUTOR dated as
         of the Effective Date in the form set out in Appendix H to this
         AGREEMENT.

1.12     "BTG DEED OF VARIATION" means the Deed of Variation to the BTG
         Agreement made between LEUKOSITE and BTG and dated as of the Effective
         Date in the form set out in Appendix I to this AGREEMENT.

1.13     "BTG ROYALTIES" shall mean the royalties payable by L&I and/or
         LEUKOSITE to British Technology Group Limited pursuant to Section 6 of
         the BTG AGREEMENT in respect of PRODUCT sold or otherwise disposed of
         by DISTRIBUTOR, its AFFILIATES or their SUBDISTRIBUTORS in the
         TERRITORY.

1.14     "CALENDAR QUARTER" shall mean the period of three consecutive calendar
         months ending on March 31, June 30, September 30 or December 31, as
         the case may be.

1.15     "CLINICAL TRIAL" shall mean CAM 211 pivotal study being presently
         conducted by L&I.

1.16     "CLL INDICATION" means the treatment of chronic lymphocytic leukemia
         in humans.

1.17     "COST OF GOODS" shall mean the aggregate of the following, determined
         in a reasonable manner in accordance with GAAP (i) the amount(s) paid
         by L&I to a THIRD

- ----------------------
         (1) "Confidential treatment requested: material has been omitted and
filed separately with the Commission".


                                       2

<PAGE>   3


         PARTY(IES) or to the DISTRIBUTOR, if applicable, for (a) manufacture
         of FINAL FORM PRODUCT or FILLED PRODUCT, as applicable; (b)
         transportation, storage and insurance for delivery to DISTRIBUTOR of
         FINAL FORM PRODUCT or, if applicable, FILLED PRODUCT ; and (c)
         performance of manufacturing and quality assurance activities (if any)
         in relation to the PRODUCT; and (ii) any direct expenses incurred by
         L&I associated with L&I's manufacturing and quality assurance
         activities (if any) in relation to the PRODUCT.

1.18     "DEVELOPMENT COMMITTEE" shall mean the Committee of Section 10.

1.19     "DEVELOPMENT EXPENSES" means the aggregate amount of expenses incurred
         for developing and obtaining regulatory approval of PRODUCT for an
         INDICATION in accordance with a DEVELOPMENT PLAN or PRELIMINARY WORK
         PLAN, as the case may be, determined in a reasonable manner in
         accordance with GAAP, including but not limited to: (i) direct labor
         (salaries, wages and employee benefits but excluding any employee
         benefits associated with equity incentive plans); (ii) materials and
         supplies; (iii) allocated maintenance and depreciation costs for
         building space directly dedicated to the development of the PRODUCT
         but excluding costs and charges relating to unused capacity,
         development of other products, and amortization of property, plant and
         equipment not directly related to development of PRODUCT for an
         INDICATION in accordance with a DEVELOPMENT PLAN or PRELIMINARY WORK
         PLAN; and (iv) payments made to THIRD PARTIES for services in
         connection with such development which are supported by invoices
         describing the work performed; and (v) insurance, telephone expenses,
         training, software amortization costs, travel and supplies. Such costs
         shall not include general overhead costs occurring from units that are
         not directly engaged in the development of the PRODUCT for an
         INDICATION in accordance with a DEVELOPMENT PLAN or PRELIMINARY WORK
         PLAN. If DEVELOPMENT EXPENSES are incurred by an AFFILIATE, they shall
         be determined and charged as set forth in this Section 1.19.

1.20     "DEVELOPMENT PLAN" means a plan for developing PRODUCT in the
         TERRITORY for an OTHER INDICATION that has been approved by the
         DEVELOPMENT COMMITTEE and that includes a budget, design of clinical
         studies and timelines.

1.21     "DISTRIBUTOR BTG LETTER" means the letter from DISTRIBUTOR to BTG
         dated as of the Effective Date in the form set out in Appendix A to
         this AGREEMENT.

1.22     "EARNINGS" means the positive or negative amount that is calculated
         for PRODUCT for each INDICATION in the PROFIT SHARING TERRITORY, in
         accordance with GAAP, by deducting from NET SALES (if any) thereof the
         following:

                  (i) COST OF GOODS for FINAL FORM PRODUCT that is sold in the
         PROFIT SHARING TERRITORY, charged on a first-in first-out basis,

                  (ii) SELLING EXPENSES for PRODUCT in the PROFIT SHARING
         TERRITORY,



                                       3
<PAGE>   4

                  (iii) MARKETING EXPENSES for PRODUCT in the PROFIT SHARING
         TERRITORY, provided, however, that MARKETING EXPENSES for a PRODUCT
         for an INDICATION in a YEAR are only deductible against EARNINGS up to
         the amount agreed to by DISTRIBUTOR and L&I pursuant to Section
         3.1(c),
                  (iv) distribution expenses for PRODUCT in the PROFIT SHARING
         TERRITORY (including monies paid to THIRD PARTIES),
                  (v) REIMBURSABLE MARKETING EXPENSES for PRODUCT in the PROFIT
         SHARING TERRITORY,
                  (vi) THIRD PARTY ROYALTIES for PRODUCT in the PROFIT SHARING
         TERRITORY,
                  (vii) cost of out-of-date, spoiled, lost or destroyed FINAL
         FORM PRODUCT for the PROFIT SHARING TERRITORY.
                  (viii) RECALL EXPENSE for PRODUCT in the PROFIT SHARING
         TERRITORY,
                  (ix) insurance premiums payable for PRODUCT for the PROFIT
         SHARING TERRITORY, including product liability insurance but excluding
         product liability expenses, such as the cost of defense, settlement
         and damage awards.
                  (x) amounts paid for co-promotion under Section 3.9.

1.23     "EMEA" shall mean the European Medicines Evaluation Agency.

1.24     "FILLED PRODUCT" means PRODUCT manufactured in accordance with the
         SPECIFICATIONS that is filled but not packaged and labeled.

1.25     "FINAL FORM PRODUCT" shall mean PRODUCT in accordance with the
         SPECIFICATIONS that is fully formulated, in final form packaged and
         labeled for ultimate consumer use.

1.26     "FIRM ORDER" means an order for PRODUCT placed with L&I that cannot be
         reduced.

1.27     "FIRST COMMERCIAL SALE" of PRODUCT shall mean the first sale for use
         or consumption by the general public of such PRODUCT in the United
         States after AGENCY approval of the PRODUCT has been granted.

1.28     "GAAP" shall mean United States Generally Accepted Accounting
         Principles.

1.29     "ILEX" means ILEX Oncology, Inc., a Delaware corporation.

1.30     "INDICATION(S)" means the CLL INDICATION and OTHER INDICATIONS.

1.31     "LEUKOSITE" means LeukoSite, Inc., a Delaware corporation.

1.32     "MAJOR COUNTRIES" means Germany, France, Italy, Spain and United
         Kingdom.

1.33     "MARKETING COMMITTEE" shall mean the MARKETING COMMITTEE of Section
         3.1(a).



                                       4
<PAGE>   5

1.34     "MARKETING EXPENSES" shall mean all costs and expenses incurred by the
         AFFILIATE of DISTRIBUTOR that distributes in the PROFIT SHARING
         TERRITORY for marketing associated with launch, advertising and sales
         promotion (including, without limitation, expenses of patient programs
         such as those involving compassionate use, indigents, uninsured and
         underinsured, training, disease information and management, and
         compliance; expenses related to promotional publications, space or
         time in various media, direct mail campaigns, samples, advertising
         agency fees and other promotional activities); phase IV studies
         (whether or not required by a regulatory agency). Such expenses
         include allocated maintenance and depreciation costs for building
         space directly dedicated to the marketing of a PRODUCT, but exclude
         costs and charges relating to unused capacity, marketing of other
         products, and amortization of property, plant and equipment not
         directly related to marketing of a PRODUCT, in each case determined in
         accordance with GAAP. MARKETING EXPENSE does not include SELLING
         EXPENSES. In each YEAR, MARKETING EXPENSES deductible against EARNINGS
         shall not exceed the amount in the MARKETING PLAN.

1.35     "MARKETING PLAN" means the MARKETING PLAN of Section 3.1.

1.36     "MSL" means medical science liaison staff members who contact key
         thought leaders in oncology to initiate or conduct medical and
         scientific dialog with respect to PRODUCT.

1.37     "NET SALES" shall mean with respect to PRODUCT that sum determined by
         deducting from the gross amount invoiced by DISTRIBUTOR or its
         AFFILIATES or any of their SUBDISTRIBUTORs for PRODUCT sold for use in
         the TERRITORY in an arms length transaction to customers who are not
         AFFILIATES of DISTRIBUTOR or their SUBDISTRIBUTORs: (i) transportation
         charges and insurance charges relating thereto; (ii) trade, quantity
         or cash discounts, to the extent allowed; (iii) rebates, chargebacks,
         credits or allowances, if any, given or made on account of price
         adjustments, or returns, to the extent made; (iv) any and all Federal,
         state or local government rebates, whether in existence now, or
         enacted at any time during the term of this AGREEMENT, to the extent
         made; (v) any tax (not including income taxes or similar taxes),
         customs duty, excise or other governmental charge upon or measured by
         the production, sale, transportation, delivery or use of the PRODUCT;
         and (vi) reasonable allowance for bad debts not to exceed one percent
         of gross amount invoiced; in each case determined in accordance with
         DISTRIBUTOR'S normal internal accounting practices and GAAP (or, in
         the case of DISTRIBUTOR'S non-United States business, International
         Accounting Standards.)

         For the purpose of calculating NET SALES, the PARTIES recognize that
         (a) a DISTRIBUTOR'S customers may include entities in the chain of
         commerce who enter into agreements with DISTRIBUTOR as to price even
         though title to the PRODUCT does not pass directly from DISTRIBUTOR to
         such customers, and even though payment for such PRODUCT is not made
         by such customers directly to DISTRIBUTOR; and (b) in such cases
         chargebacks paid by DISTRIBUTOR to or through a THIRD PARTY (such as a
         wholesaler) can be deducted by a DISTRIBUTOR from gross revenue in
         order to



                                       5
<PAGE>   6

         calculate a DISTRIBUTOR'S Net Sales. Any deductions listed above which
         involve a payment by a DISTRIBUTOR shall be taken as a deduction
         against aggregate sales for the period in which the payment is made or
         deduction is taken.

         In the event that DISTRIBUTOR or its AFFILIATES sells through or to a
         SUBDISTRIBUTOR, or DISTRIBUTOR sells through an AFFILIATE, then NET
         SALES shall be calculated based on the amount invoiced by DISTRIBUTOR
         or its AFFILIATES or their SUBDISTRIBUTOR to an entity that is not an
         AFFILIATE or SUBDISTRIBUTOR.

1.38     "OPT OUT OPTION" shall have the meaning set forth in Section 12.1
         (c)(ii).

1.39     "OTHER CANCER INDICATION(S)" means the treatment of cancer, other than
         a CLL INDICATION, in humans. For the avoidance of doubt, it is agreed
         that transplantation procedures in humans for the treatment of cancer
         constitutes an OTHER CANCER INDICATION.

1.40     "OTHER INDICATIONS" means OTHER CANCER INDICATIONS and OTHER
         NON-CANCER INDICATIONS.

1.41     "OTHER NON-CANCER INDICATION(S)" means one or more of the following
         indications: the treatment of rheumatoid arthritis in humans; the
         treatment of multiple sclerosis in humans; therapeutic indications in
         human transplantation (other than for treatment of cancer); and any
         other indications as to which L&I obtains rights under the BTG
         AGREEMENT, in each case other than the CLL INDICATION or OTHER CANCER
         INDICATIONS.

1.42     "OTHER TERRITORY" shall mean all countries of the TERRITORY other than
         the PROFIT-SHARING TERRITORY.

1.43     "PARTY(IES)" shall mean DISTRIBUTOR and/or L&I, as the case may be.

1.44     "PAYMENT AMOUNT" means for PRODUCT for an OTHER NON-CANCER INDICATION
         ******(2) percent of the aggregate of (i) total sales for all PRODUCT
         for such INDICATION in the YEAR that has the highest total sales
         therefor in the United States in any YEAR of the first five YEARS
         after initial launch of a PRODUCT for such INDICATION in the United
         States and (ii) total sales for all PRODUCT for such INDICATION in the
         YEAR that has the highest total aggregate sales therefor in countries
         of the TERRITORY other than the United States in any YEAR of the first
         five YEARS after initial launch of a PRODUCT for such INDICATION in
         Europe.

- -------------------
         (2) "Confidential treatment requested: material has been omitted and
filed separately with the Commission".



                                       6
<PAGE>   7

1.45     "PRELIMINARY DEVELOPMENT PLAN" means a compilation of information
         and/or data of the type that is sufficient to conduct a pre-IND
         meeting with the FDA for PRODUCT for an OTHER NON-CANCER INDICATION.

1.46     "PRELIMINARY WORK PLAN" means a plan for performing non-clinical or
         exploratory clinical research, including a budget, with respect to
         PRODUCT for an OTHER NON-CANCER INDICATION.

1.47     "PRIME" means "prime rate" as publicly announced by the Bank of
         America National Trust and Savings Association in San Francisco as its
         prime rate as set forth on the REUTERS screen (USPRIME1). Interest
         shall be calculated on the actual number of days elapsed over a 365
         -day year.

1.48     "PRODUCT" shall mean the humanized antibody directed against CD-52
         known as Campath 1H and any product containing such antibody as an
         active ingredient.

1.49     "PROFIT SHARING TERRITORY" means the United States of America.

1.50     "RECALL EXPENSE" shall mean the cost and expense for recall or market
         withdrawal of PRODUCT in the PROFIT SHARING TERRITORY required or
         requested by a governmental authority having jurisdiction thereover or
         as a result of a decision of the MARKETING COMMITTEE, including, but
         not limited to, expenses incurred for replacement of PRODUCT, all in
         accordance with GAAP.

1.51     "REIMBURSABLE MARKETING EXPENSES" shall mean the MARKETING EXPENSES
         incurred in the PROFIT-SHARING TERRITORY with respect to PRODUCT for
         an INDICATION prior to launch thereof incurred by the AFFILIATE of
         DISTRIBUTOR that is distributing PRODUCT in the PROFIT-SHARING
         TERRITORY, with one-eighth (1/8) of the aggregate thereof being
         charged against EARNINGS for the PRODUCT for the CLL INDICATION in
         each of the eight CALENDAR QUARTERS after launch thereof. The
         REIMBURSABLE MARKETING EXPENSES for the CLL INDICATION shall not
         exceed ****** ******(3). For OTHER INDICATIONS, the maximum amount
         shall be determined by the MARKETING COMMITTEE.

1.52     "SELLING EXPENSES" means the aggregate amount of all direct
         incremental expenses incurred for the sales force and sales force
         management by the AFFILIATE of DISTRIBUTOR that is distributing
         PRODUCT in the PROFIT-SHARING TERRITORY, all in accordance with GAAP
         and all only as they relate to sale of PRODUCT for an INDICATION in
         the PROFIT-SHARING TERRITORY, including but not limited to salaries,
         commissions, sales incentive payments, sales training

- -------------------
         (3) "Confidential treatment requested: material has been omitted and
filed separately with the Commission".


                                       7

<PAGE>   8

         expenses, and travel expenses. The SELLING EXPENSES deductible against
         EARNINGS for each YEAR for PRODUCT for the CLL INDICATION shall not
         exceed the lesser of the amount in the MARKETING PLAN or ******(3)
         (proportionately adjusted for part of a YEAR) which ******(4) limit
         shall be adjusted by applying the following factor:

                           BA * CPI
                           BCPI
         BA       =        *************************************************(5)
                           BCPI =        the Bureau of Labor Statistics Consumer
                           Price Index for All Urban Consumers;  All cities;
                           All Items for January 1, 2000; and
                           CPI =         the Bureau of Labor Statistics Consumer
                           Price Index for All Urban Consumers; All cities; All
                           Items for January of the current year.

         For all OTHER INDICATIONS, the amount deductible in a YEAR against
         EARNINGS shall not exceed the amount in the MARKETING PLAN.

1.53     "SPECIFICATIONS" shall have the meaning set forth in Section 1.9 of
         the BI AGREEMENT.

1.54     "SUBDISTRIBUTOR" shall mean an entity other than an AFFILIATE through
         which DISTRIBUTOR routinely conducts all of its sales business of
         PRODUCT in a particular country of the TERRITORY, and which entity
         assumes the marketing, promotional, distribution and sales obligations
         of DISTRIBUTOR in any country. SUBDISTRIBUTOR excludes THIRD PARTIES
         such as wholesalers, pharmacists, hospitals, and health management
         organizations.

1.55     "TERRITORY" shall mean all countries of the world except those of
         Appendix C.

1.56     "THIRD PARTY" shall mean a person or entity other than DISTRIBUTOR,
         L&I, LEUKOSITE, ILEX or their respective AFFILIATES.

1.57     "THIRD PARTY ROYALTIES" shall mean the BTG ROYALTIES and any other
         royalties payable to THIRD PARTIES pursuant to the THIRD PARTY
         agreements listed in Appendix G as of the Effective Date, or
         subsequently added thereto with the consent of the DISTRIBUTOR in
         respect of sales of the PRODUCT by the DISTRIBUTOR, its AFFILIATES and
         SUBDISTRIBUTORS

1.58     "TRADEMARK" shall mean CAMPATH(R).

- ---------------------
         (4) "Confidential treatment requested: material has been omitted and
filed Separately with the Commission".
         (5) "Confidential treatment requested: material has been omitted and
filed Separately with the Commission".


                                       8

<PAGE>   9

1.59     "YEAR" shall mean the 12-month period beginning on January 1, except
         that the initial YEAR shall extend from the Effective Date until
         December 31st of the calendar year of the Effective Date (such that it
         may include less than 12 months).

2.       APPOINTMENT

2.1      GRANT OF DISTRIBUTION RIGHTS.

         (a)      L&I hereby appoints DISTRIBUTOR as the exclusive distributor
                  of the PRODUCT in the TERRITORY for use only in the TERRITORY
                  for the CLL INDICATION and for OTHER INDICATIONS, each for
                  the term set forth in Article 18 (unless earlier terminated
                  pursuant to this AGREEMENT), and DISTRIBUTOR accepts such
                  appointment.

         (b)      DISTRIBUTOR agrees that DISTRIBUTOR (i) will sell and
                  distribute PRODUCT in the TERRITORY only for the INDICATIONS
                  for which DISTRIBUTOR retains distribution rights under this
                  AGREEMENT; (ii) will only sell in the TERRITORY PRODUCT which
                  is purchased from L&I; and (iii) will only sell PRODUCT in
                  the TERRITORY under the TRADEMARK.

         (c)      DISTRIBUTOR agrees to distribute the PRODUCT for an
                  INDICATION only in accordance with the terms, conditions and
                  purposes of this AGREEMENT, and, in the PROFIT-SHARING
                  TERRITORY, only in accordance with the MARKETING PLAN
                  therefor.

2.2      LIMITATION ON DISCOUNTING.

         DISTRIBUTOR agrees that DISTRIBUTOR will not without L&I's written
         consent discount the selling price of PRODUCT in order to promote the
         sales of other products of DISTRIBUTOR and that it will conduct all
         price negotiations in good faith on an arms length basis provided,
         however, that the foregoing should not be interpreted as permitting
         L&I to set prices in countries of the European Union. It is expressly
         understood that L&I cannot provide such consent unless L&I receives
         the consent of BTG.

2.3      SALES THROUGH SUBDISTRIBUTORS.

         DISTRIBUTOR intends to sell PRODUCT through its AFFILIATES in
         countries where DISTRIBUTOR has AFFILIATES in the TERRITORY and in
         Germany through DISTRIBUTOR'S existing distributor Medac GmbH. L&I
         consents to Medac GmbH as a SUBDISTRIBUTOR. DISTRIBUTOR can sell
         product in the TERRITORY through SUBDISTRIBUTORs only as follows:

         (i) Without the consent of L&I, through SUBDISTRIBUTORs of DISTRIBUTOR
         that distribute FLUDARA(R) in countries of the TERRITORY (other than
         MAJOR COUNTRIES) where FLUDARA(R) is sold through SUBDISTRIBUTORs; and



                                       9
<PAGE>   10

         (ii) With the consent of L&I, in all countries of the TERRITORY not
         included in Section 2.3(i), which consent shall not be unreasonably
         withheld or delayed.

3.       MARKETING IN THE PROFIT-SHARING TERRITORY

3.1      MARKETING COMMITTEE.

         (a)      The marketing and selling of PRODUCT in the PROFIT SHARING
                  TERRITORY for (i) the CLL INDICATION and (ii) OTHER
                  INDICATIONS for which DISTRIBUTOR retains distribution rights
                  shall be overseen by a committee composed of four members,
                  with DISTRIBUTOR appointing two (2) members and L&I two (2)
                  members (the "MARKETING COMMITTEE"), with a member appointed
                  by DISTRIBUTOR being Chairman of the MARKETING COMMITTEE.

         (b)      The MARKETING COMMITTEE shall meet at the call of the
                  Chairman, but not less than once each CALENDAR QUARTER of
                  each YEAR, at the offices of BERLEX or such other place
                  designated by the Chairman. A quorum for the conduct of
                  business at any meeting of the MARKETING COMMITTEE shall
                  consist of at least one representative of DISTRIBUTOR and at
                  least one L&I representative. L&I and DISTRIBUTOR shall each
                  have one vote and all decisions shall be by unanimous vote.

         (c)      By no later than July 1 of each YEAR, commencing with the
                  YEAR in which a BLA for the PRODUCT for the CLL INDICATION is
                  obtained, DISTRIBUTOR shall submit to the MARKETING COMMITTEE
                  a proposed MARKETING PLAN for sales and marketing of each
                  INDICATION for PRODUCT which is to be distributed by
                  DISTRIBUTOR in the PROFIT-SHARING TERRITORY. The PARTIES will
                  agree to a reasonable timetable for the submission of the
                  MARKETING PLAN for the YEAR in which initial BLA approval is
                  anticipated. Each MARKETING PLAN shall include for the
                  following YEAR: (i) a budget, including an estimate of
                  SELLING EXPENSES, MARKETING EXPENSES and other expenses for
                  the PRODUCT; (ii) an estimate of PRODUCT to be ordered under
                  Section 6.1; (iii) a price range for sales of PRODUCT based
                  on a study made by an expert selected by the MARKETING
                  COMMITTEE; (iv) an outline of marketing and detail strategies
                  and tactics; (v) Phase IV studies, if any, for PRODUCT for
                  each INDICATION; and (vi) any other information reasonably
                  requested by a member of the MARKETING COMMITTEE that is
                  within the possession of DISTRIBUTOR.

                  The MARKETING COMMITTEE shall discuss such plan, including
                  any proposed amendments and/or additions thereto, and shall
                  decide upon a final plan by the end of the third CALENDAR
                  QUARTER of the YEAR in which the plan is submitted. The final
                  plan for each INDICATION for PRODUCT approved by the
                  MARKETING COMMITTEE is the MARKETING PLAN for the following



                                      10
<PAGE>   11

                  YEAR. The approved MARKETING PLAN shall provide for a
                  national selling effort, inclusion in the BERLEX annual
                  action plan and in the BERLEX annual sales incentive
                  compensation plan in a manner that does not disadvantage
                  PRODUCT taking into consideration, without limitation,
                  PRODUCT profile, size of the market, profit potential,
                  approved labeling and reimbursement approval status. Once
                  approved, a MARKETING PLAN for a YEAR can only be amended by
                  a decision of the MARKETING COMMITTEE.

         (d)      In addition to approval of the MARKETING PLAN, the MARKETING
                  COMMITTEE shall discuss, review and monitor marketing of
                  PRODUCT in accordance with the MARKETING PLAN therefor,
                  discuss future planning for the marketing of PRODUCT for an
                  INDICATION, and coordinate and implement any required recall
                  of PRODUCT. It is specifically understood, however, that the
                  management and direction of marketing and sales activities
                  and the implementation of the MARKETING PLAN shall be managed
                  by DISTRIBUTOR rather than the MARKETING COMMITTEE.

                  If the MARKETING COMMITTEE fails to reach agreement as to any
                  matter, the PARTIES agree to exert all reasonable efforts to
                  arrive at a mutually acceptable resolution, including a
                  meeting between the Head of the SBU Therapeutics of BERLEX
                  and a manager of the General Partner of L&I, and if such
                  resolution is not reached within thirty (30) days, and
                  subject to Section 3.2(c), DISTRIBUTOR shall have the right
                  to make the final decision except as provided in Sections
                  3.1(e), 3.1(f) and 3.1(g), which decisions require the mutual
                  consent of DISTRIBUTOR and L&I.

         (e)      DISTRIBUTOR and L&I shall agree to a range of average prices
                  of PRODUCT for an INDICATION for a YEAR by no later than
                  November 30th of the previous YEAR, and the price charged by
                  DISTRIBUTOR for PRODUCT for an INDICATION for a YEAR shall
                  result in an average price therefor within the agreed to
                  average price range for such YEAR.

         (f)      DISTRIBUTOR and L&I shall agree in writing to the maximum
                  MARKETING EXPENSES that can be charged against EARNINGS for
                  PRODUCT for an INDICATION in a YEAR by no later than November
                  30th of the previous YEAR.

         (g)      DISTRIBUTOR and L&I shall agree to the maximum PREMARKETING
                  EXPENSES and the MAXIMUM SELLING EXPENSES for PRODUCT for
                  each of the OTHER INDICATIONS for the purpose of calculating
                  EARNINGS therefor prior to BLA approval thereof.

3.2      Marketing Effort of DISTRIBUTOR

         (a) During the term of this AGREEMENT, for each INDICATION for which
there is a MARKETING PLAN, DISTRIBUTOR shall manage and direct the marketing
effort for the PRODUCT pursuant to the MARKETING PLAN approved by the MARKETING



                                      11
<PAGE>   12

COMMITTEE. DISTRIBUTOR shall exercise commercially reasonable efforts to
promote, market and sell PRODUCT in the PROFIT-SHARING TERRITORY in accordance
with the MARKETING PLAN and shall maintain, at its own cost and expense, an
adequate sales organization for this purpose. DISTRIBUTOR shall keep L&I
advised of general market, economic and regulatory developments that may affect
the sale of such PRODUCT in the PROFIT-SHARING TERRITORY.

         (b)      DISTRIBUTOR agrees to provide L&I with DISTRIBUTOR'S annual
                  sales forecast for PRODUCT to be sold in the TERRITORY for
                  each INDICATION as to which DISTRIBUTOR retains distribution
                  rights for the purpose of assisting L&I in its financial
                  planning. Sales forecasts shall not be binding on
                  DISTRIBUTOR.

         (c)      With respect to PRODUCT for the CLL INDICATION in the
                  PROFIT-SHARING TERRITORY, the MARKETING PLAN shall provide
                  for efforts with respect to marketing and sales that are at
                  least comparable to the efforts with respect to FLUDARA(R)
                  prior to expiration of patent protection for FLUDARA(R), and
                  in the first twelve (12) months after PRODUCT launch for the
                  CLL INDICATION in the PROFIT-SHARING TERRITORY, the MARKETING
                  PLAN shall provide for marketing and selling efforts that are
                  at least equal to those exerted in the industry with respect
                  to oncology products of equivalent potential for such period.


3.3      Earnings Reports.

         (a) In the PROFIT-SHARING TERRITORY, with respect to PRODUCT for the
CLL INDICATION and for each OTHER INDICATION for which DISTRIBUTOR retains
distribution rights, after BLA approval thereof, within thirty (30) days after
the end of each CALENDAR QUARTER of each YEAR, DISTRIBUTOR shall provide L&I
with a separate report of the EARNINGS for PRODUCT for each such INDICATION
(either positive or negative) for the CALENDAR QUARTER. Within sixty (60) days
after the end of each YEAR, DISTRIBUTOR shall provide L&I with a separate
report of EARNINGS for PRODUCT for each INDICATION (either positive or
negative) in the PROFIT-SHARING TERRITORY. Each CALENDAR QUARTER and YEAR
report shall contain the following information:

                           (i) Quantity of PRODUCT sold by DISTRIBUTOR, and its
                  AFFILIATES and if applicable, its SUBDISTRIBUTORs.
                           (ii) Total amount invoiced for PRODUCT;

                           (iii) Calculation of NET SALES.
                           (iv) A separate calculation for each of items (i) to
                  (x) to be deducted from EARNINGS;
                           (v)  Calculation of amount due to or to be paid by
                  L&I under Section 3.4 or 3.5, as the case may be; and



                                      12
<PAGE>   13

                           (vi) Any other information reasonably requested by
                  L&I and within the possession of DISTRIBUTOR for determining
                  amount due to or to be paid by L&I.


         (b) The reports for each YEAR shall be audited reports and shall be
         charged against EARNINGS.

3.4      QUARTERLY PAYMENT OF APPROPRIATE PERCENTAGE.

         (a)      In the PROFIT-SHARING TERRITORY, for each CALENDAR QUARTER in
                  which the EARNINGS for PRODUCT for the CLL INDICATION are
                  positive, and subject to Section 3.7, for each CALENDAR
                  QUARTER in which the EARNINGS for PRODUCT for an OTHER
                  INDICATION for which DISTRIBUTOR retains distribution rights
                  are positive, BERLEX shall pay to L&I its APPROPRIATE
                  PERCENTAGE of such positive EARNINGS for each such INDICATION
                  within sixty (60) days after the end of the applicable
                  CALENDAR QUARTER or thirty (30) days after the delivery of
                  the report of EARNINGS for such CALENDAR QUARTER, whichever
                  is earlier.

         (b)      For the PROFIT-SHARING TERRITORY for each CALENDAR QUARTER in
                  which the EARNINGS for a PRODUCT for the CLL INDICATION are
                  negative and, subject to Section 3.7, in each CALENDAR
                  QUARTER in which the EARNINGS for PRODUCT for OTHER
                  INDICATIONS for which DISTRIBUTOR retains distribution rights
                  are negative, L&I shall pay to DISTRIBUTOR the APPROPRIATE
                  PERCENTAGE of such negative EARNINGS for each such INDICATION
                  within sixty (60) days after L&I receives the report under
                  Section 3.3 that includes such negative EARNINGS.

3.5      YEARLY PAYMENT OF APPROPRIATE PERCENTAGE.

         With respect to the PROFIT-SHARING TERRITORY, within sixty (60) days
         of the end of each YEAR, DISTRIBUTOR shall separately determine
         EARNINGS for PRODUCT for the YEAR for the CLL INDICATION and, subject
         to Section 3.7, for each OTHER INDICATION as to which DISTRIBUTOR
         retains distribution rights and L&I shall receive or pay the
         APPROPRIATE PERCENTAGE of the EARNINGS therefor for the applicable
         YEAR, adjusted for the aggregate of the amounts received and/or paid
         by L&I under Section 3.4 for the CALENDAR QUARTERS of the appropriate
         YEAR. Any payment due from DISTRIBUTOR shall be made within ninety
         (90) days of the end of the applicable YEAR, or thirty (30) days after
         delivery of the report of EARNINGS for such YEAR, whichever is
         earlier. Any payment due to DISTRIBUTOR shall be made within thirty
         (30) days after L&I receives the yearly report under Section 3.3.



                                      13
<PAGE>   14


3.6      CREDIT TOWARD LOAN BALANCE.

         For each YEAR in which EARNINGS are positive, beginning five YEARS
         after launch of PRODUCT for an INDICATION in the PROFIT-SHARING
         TERRITORY, until the outstanding portion of the loans made pursuant to
         Section 9.1(a) and the interest thereon is repaid, in addition to the
         amounts payable under Section 3.4 and 3.5, L&I shall be credited with
         an additional ******(6) percent of positive EARNINGS for PRODUCT for
         each INDICATION, if any, within sixty (60) days after the end of the
         YEAR, which DISTRIBUTOR shall retain and apply to repayment of the
         outstanding portion of the loan and interest thereon made pursuant to
         Section 9.1(a).

3.7      PAYMENT IN LIEU OF EARNINGS.

         In the event that L&I does exercise its OPT OUT OPTION with regard to
         development of PRODUCT for an OTHER NON-CANCER INDICATION in the
         PROFIT SHARING TERRITORY, and DISTRIBUTOR continues such funding and
         BLA approval for PRODUCT for such OTHER NON-CANCER INDICATION is
         obtained, L&I shall not be required to make or entitled to receive
         payments under Sections 3.4 and 3.5 based on EARNINGS in the PROFIT
         SHARING TERRITORY, and in lieu thereof, L&I shall receive ******(7)
         percent of NET SALES of PRODUCT for such OTHER INDICATION in the
         PROFIT SHARING TERRITORY which shall be due and payable with respect
         to NET SALES thereof in a CALENDAR QUARTER within sixty (60) days
         after the end of the CALENDAR QUARTER. In addition, the report due
         under Section 3.3 for a PRODUCT for such OTHER NON-CANCER INDICATION
         may only include items (i), (ii), (iii) and (vi) and a calculation of
         the amount due under this Section 3.7.

3.8      RECORDKEEPING BY DISTRIBUTOR.

         DISTRIBUTOR shall keep, and shall cause each of its AFFILIATES to
         keep, and if applicable, their SUBDISTRIBUTORs, full and accurate
         books of account containing all particulars that may be necessary for
         the purpose of calculating EARNINGS and NET SALES and all payments
         payable to L&I in the PROFIT-SHARING TERRITORY for PRODUCT sold in the
         PROFIT-SHARING TERRITORY. Such books of account shall be kept at their
         principal place of business and, with all necessary supporting data
         shall, for the three (3) years next following the end of the calendar
         year to which each shall pertain be open for inspection by an
         independent certified accountant selected by L&I

- -------------------
         (6) "Confidential treatment requested: material has been omitted and
filed Separately with the Commission".
         (7) "Confidential treatment requested: material has been omitted and
filed Separately with the Commission".


                                      14
<PAGE>   15
         and reasonably acceptable to DISTRIBUTOR upon reasonable notice during
         normal business hours at L&I's expense for the sole purpose of
         verifying payments or compliance with this AGREEMENT, but in no event
         (subject to Section 13.16) more than once in each YEAR. All information
         and data offered shall be used only for the purpose of verifying
         payments. In the event that such inspection shall indicate that in any
         YEAR the payments which should have been paid by DISTRIBUTOR are at
         least five percent (5%) greater than those which were actually paid by
         DISTRIBUTOR, or that, in the case of negative EARNINGS, the amounts
         that were paid by L&I to DISTRIBUTOR are at least five percent (5%)
         more than those that should have been paid by L&I, then DISTRIBUTOR
         shall pay the cost of such inspection. All underpayments and
         overpayments are immediately due and payable.

3.9      CO-PROMOTION.

         (a)      L&I shall have the right itself and/or to designate one or
                  more of either LEUKOSITE or ILEX to co-promote with
                  DISTRIBUTOR or its AFFILIATE, as the case may be, in the
                  PROFIT-SHARING TERRITORY, PRODUCT for the CLL INDICATION and
                  OTHER CANCER INDICATIONS by written notice to DISTRIBUTOR at
                  least six (6) months prior to the contemplated initiation of
                  such co-promotion.

         (b)      The co-promoting PARTY shall co-promote such PRODUCT in a
                  YEAR in accordance with the approved MARKETING PLAN for such
                  YEAR through MSL activities. The number of personnel employed
                  to co-promote shall not exceed twelve in the United States,
                  and shall only conduct activities similar to those conducted
                  by BERLEX'S MSL staff. DISTRIBUTOR and L&I will coordinate
                  the activities of the L&I MSL staff to optimize utilization
                  and avoid duplication of effort.

         (c)      For each CALENDAR QUARTER, DISTRIBUTOR shall pay to the
                  co-promoting PARTY direct expenses for the MSL force and MSL
                  force management, all only as it relates to co-promotion of
                  PRODUCT under this Section 3.9 which shall be due and payable
                  sixty (60) days after submission of an invoice therefor, but
                  shall not exceed the average cost incurred by BERLEX for its
                  own MSL staff members assigned to PRODUCT for an oncology
                  indication. DISTRIBUTOR shall have the right to audit the
                  expenses charged to DISTRIBUTOR pursuant to this Section on
                  the same terms set forth in Section 6.12 for L&I's audits of
                  DISTRIBUTOR.

         (d)      L&I shall have the right to terminate the co-promotion by six
                  (6) months' prior written notice.

3.10     PAYMENT OF INSURANCE PREMIUMS

         DISTRIBUTOR shall pay the cost and expense of insurance premiums for
         L&I with respect to PRODUCT in the PROFIT SHARING TERRITORY, including
         product



                                      15
<PAGE>   16

         liability insurance but excluding product liability expenses, such as
         the cost of defense, settlement and damage, within thirty (30) days of
         invoice therefor. The payment made under this Section 3.10 shall be
         deductible against EARNINGS.

4.       MARKETING IN THE OTHER TERRITORY

4.1      SALES FORECAST

         The DISTRIBUTOR agrees to provide L&I with DISTRIBUTOR'S annual sales
         forecast for PRODUCT to be sold in the OTHER TERRITORY for each
         INDICATION as to which DISTRIBUTOR retains distribution rights for the
         purpose of assisting L&I in its financial planning. Sales forecasts
         shall not be binding on the DISTRIBUTOR.

4.2      MARKETING EFFORTS

         (a)      In MAJOR COUNTRIES, DISTRIBUTOR shall exert reasonable
                  commercial efforts to market and sell PRODUCT for each
                  INDICATION in each country in which such PRODUCT is approved
                  for sale. Such reasonable commercial efforts shall take into
                  consideration, without limitation, PRODUCT profile, size of
                  the market, profit potential, approved labeling,
                  reimbursement approval status, and other factors that a
                  reasonable business person would take into consideration in
                  determining the extent of effort to exert in the marketing
                  and selling of PRODUCT.

         (b)      In countries of the OTHER TERRITORY which are not MAJOR
                  COUNTRIES, DISTRIBUTOR shall notify L&I, in writing, as to
                  whether it intends to pursue commercialization of a PRODUCT
                  for an INDICATION as to which DISTRIBUTOR retains
                  distribution rights no later than ninety (90) days after
                  regulatory approval thereof in Europe. With respect to any
                  countries as to which DISTRIBUTOR does not provide such
                  written notice, or, having given notice, subsequently
                  notifies L&I of an intention not to pursue commercialization,
                  L&I or DISTRIBUTOR shall have the right to grant distribution
                  rights in such country to a THIRD PARTY by sixty (60) days'
                  prior written notice to the other, identifying the
                  country(ies), the THIRD PARTY and the terms and conditions
                  thereof. Unless the PARTY receiving the notice provides
                  reasonable written objection thereto within such sixty (60)
                  day period on the basis that the granting of such rights will
                  adversely affect marketing and sale of PRODUCT for such
                  INDICATION in a country in which PRODUCT is being, or is to
                  be, distributed by DISTRIBUTOR, or to the terms and
                  conditions of the distribution rights, then such distribution
                  rights shall be granted to such THIRD PARTY and L&I, and
                  DISTRIBUTOR shall share, on a ****** ******(8) basis,
                  respectively, the costs and benefits incurred with respect to
                  the granting of such distribution rights.

- --------------------
         (8) "Confidential treatment requested: material has been omitted and
filed Separately with the Commission".


                                      16
<PAGE>   17

         (c)      With respect to PRODUCT for an INDICATION to which SCHERING
                  has distribution rights, SCHERING agrees to provide to L&I a
                  separate marketing plan for PRODUCT for each INDICATION for
                  each MAJOR COUNTRY of the OTHER TERRITORY and an aggregate
                  marketing plan for all other countries of the OTHER TERRITORY
                  for each YEAR by October 1 of the previous YEAR, which
                  marketing plan shall contain information similar to that
                  included in marketing plans for DISTRIBUTOR'S product in such
                  countries that qualify for primary promotion (for example
                  FLUDARA(R)) and within sixty (60) days after the end of each
                  YEAR, DISTRIBUTOR shall provide L&I with a written report
                  with respect to the results for the applicable YEAR as
                  compared to the marketing plan for the applicable YEAR for
                  each country in the OTHER TERRITORY for PRODUCT for each
                  INDICATION.

5.       ORPHAN DRUG EXCLUSIVITY.

         (a)      To the fullest extent permitted by law, the PARTIES agree
                  that DISTRIBUTOR will have the right to claim and use any
                  taxation credits (accruing to DISTRIBUTOR after the Effective
                  Date), deductions or other taxation benefits available as a
                  result of funding by DISTRIBUTOR, in whole or part, of
                  clinical studies for an INDICATION for PRODUCT that has been
                  designated as an orphan indication by FDA, and similar
                  taxation benefits available in other countries of the
                  TERRITORY. L&I agrees that it will take such reasonable
                  actions as DISTRIBUTOR may request to permit DISTRIBUTOR to
                  obtain such taxation benefits, including without limitation
                  sharing with DISTRIBUTOR ownership of orphan drug petitions,
                  designations, and grants of exclusivity; provided, however,
                  that L&I shall not be required by this Section to share with
                  DISTRIBUTOR ownership or sponsorship of any BLA for PRODUCT.
                  With respect to any transfer of rights or ownership under
                  this Section 5, such transfer shall be made in a manner such
                  that such rights and/or ownership by DISTRIBUTOR is
                  automatically terminated when DISTRIBUTOR'S rights to PRODUCT
                  for the applicable INDICATION are terminated under this
                  AGREEMENT. For avoidance of doubt, the PARTIES state that if
                  L&I has complied with the requirements of this Section, L&I
                  shall have no liability to DISTRIBUTOR in the event that
                  DISTRIBUTOR is unable to avail itself of favorable taxation
                  treatment contemplated by this Section.

         (b)      DISTRIBUTOR shall have the right to nominate one or more of
                  DISTRIBUTOR'S AFFILIATES to exercise the rights set forth in
                  this section.

6.       PURCHASE OF PRODUCTS

6.1      PURCHASE AND SALE REQUIREMENTS.

         (a)     Subject to Section 6.3 and Section 8, L&I shall sell and
                 DISTRIBUTOR shall purchase an amount of FINAL FORM PRODUCT or
                 FILLED PRODUCT as



                                      17
<PAGE>   18
                 applicable for INDICATIONS equal to DISTRIBUTOR'S
                 requirements in the TERRITORY.

         (b)     Subject to availability of FINAL FORM PRODUCT or FILLED
                 PRODUCT as applicable from L&I, DISTRIBUTOR shall maintain
                 sufficient inventories of PRODUCT to enable DISTRIBUTOR to
                 effectively satisfy demand for PRODUCT in the TERRITORY.

         (c)     Unless otherwise agreed between the PARTIES, L&I shall sell
                 and DISTRIBUTOR shall purchase PRODUCT as FINAL FORM PRODUCT
                 for sale in the PROFIT-SHARING TERRITORY and as FILLED PRODUCT
                 for production of FINAL FORM PRODUCT for sale in the OTHER
                 TERRITORY.

         (d)     DISTRIBUTOR shall purchase from L&I 60,000 ampoules of FILLED
                 PRODUCT in October 1999; 90,000 ampoules of FILLED PRODUCT in
                 January 2000, and 60,000 ampoules of FILLED PRODUCT in April
                 2000. With respect to the FILLED PRODUCT purchased under this
                 Section 6.1(d), title to and risk of loss with respect to
                 FILLED PRODUCT shall pass to DISTRIBUTOR when produced by BI.
                 BI shall maintain possession of the FILLED PRODUCT until
                 DISTRIBUTOR requests shipment thereof as FINAL FORM PRODUCT or
                 FILLED PRODUCT. DISTRIBUTOR shall pay to L&I the COST OF GOODS
                 for the FILLED PRODUCT that has been incurred as of such time
                 within thirty (30) days of invoice therefor, which shall be no
                 earlier than the date that FILLED PRODUCT is produced by BI.
                 FILLED PRODUCT purchased under this Section 6.1(d) that is to
                 be sold by DISTRIBUTOR in the PROFIT-SHARING TERRITORY shall be
                 converted to FINAL FORM PRODUCT by BI. FILLED PRODUCT that is
                 purchased by DISTRIBUTOR that is to be sold in the OTHER
                 TERRITORY shall be converted to FINAL FORM PRODUCT by
                 DISTRIBUTOR. At the time of shipment of PRODUCT to DISTRIBUTOR
                 under this Section 6.1(d), DISTRIBUTOR shall pay to L&I the
                 COST OF GOODS therefor, less any portion of COST OF GOODS
                 previously paid under this Section 6.1(d). The COST OF GOODS of
                 such ampoules sold in the PROFIT-SHARING TERRITORY shall be
                 charged against EARNINGS when sold. DISTRIBUTOR and L&I agree
                 that they will cooperate with each other and use all reasonable
                 efforts to obtain the agreement of BI to reduce the quantity
                 that is to be purchased under this Section 6.1(d). In the event
                 that a surcharge is paid to BI under the BI AGREEMENT for
                 failure to make the minimum purchases required by Section 2.8
                 of the BI AGREEMENT in the first full YEAR after launch of the
                 PRODUCT, then as to the portion of the minimum purchase
                 deficiency that results from the purchase of excess inventory
                 under Section 6.1(d), DISTRIBUTOR shall have the right to
                 credit one-twentieth of the amount paid by DISTRIBUTOR for such
                 portion under Section 8.2(iv) against amounts to be paid to L&I
                 under Section 3.4(a) for the first twenty CALENDAR QUARTERS. If
                 EARNINGS in any such first twenty CALENDAR QUARTERS should be
                 negative, the amount payable by L&I to DISTRIBUTOR pursuant to
                 Section 3.4(b) will be increased by one-



                                      18
<PAGE>   19

                  twentieth of the amount paid by DISTRIBUTOR for such portion
                  under Section 8.2(iv).

6.2      CERTAIN PACKAGING AND LABELING BY DISTRIBUTOR.

         (a)      In view of DISTRIBUTOR'S expertise in the production and
                  release of pharmaceutical products, and taking into account
                  DISTRIBUTOR'S experience in dealing with and proximity to BI,
                  it is agreed that DISTRIBUTOR shall carry out the following
                  activities in respect of PRODUCT to be sold in the OTHER
                  TERRITORY: (i) labeling and packaging of FILLED PRODUCT to
                  produce FINAL FORM PRODUCT; and (ii) quality assurance and
                  quality control services necessary to provide for final
                  release of FINAL FORM PRODUCT. Only DISTRIBUTOR'S direct
                  costs and expenses with respect to the activities to be
                  performed pursuant to this Section 6 (including loss for
                  normal packaging losses) shall be COST OF GOODS for Section
                  6.7(a)(v).

         (b)      With respect to the services described in Section 6.2(a),
                  DISTRIBUTOR warrants and represents that the FINAL FORM
                  PRODUCT to be produced by DISTRIBUTOR for L&I hereunder shall
                  be labeled, packaged and released in accordance with the
                  SPECIFICATIONS, and such services shall be performed
                  according to Good Manufacturing Practices standards and known
                  and published standards of EMEA applicable as of the time the
                  activities performed by DISTRIBUTOR are undertaken, and in
                  accordance with all other laws, rules and regulations
                  applicable in the country where the activities are performed.
                  DISTRIBUTOR further warrants and represents that the
                  activities being performed by DISTRIBUTOR shall not result in
                  any lien or claim on PRODUCT which affects title. DISTRIBUTOR
                  makes no other warranties and representations with respect to
                  the activities to be performed by DISTRIBUTOR pursuant to
                  this Section.

6.3      PRIORITY IN SUPPLY.

         L&I shall use commercially reasonable efforts to satisfy DISTRIBUTOR'S
         requirements for FINAL FORM PRODUCT or FILLED PRODUCT as applicable.
         However, L&I's obligation to supply FINAL FORM PRODUCT or FILLED
         PRODUCT, as applicable, under Section 6.1 hereof shall at all times be
         subject to the condition that L&I is able to obtain a sufficient
         supply of such PRODUCT for sale both inside and outside of the
         TERRITORY. In the event that PRODUCT available to L&I is in short
         supply, L&I shall notify DISTRIBUTOR of such shortage as soon as
         possible. In the event there is a short supply of PRODUCT and L&I
         cannot supply PRODUCT to DISTRIBUTOR in an amount equal to
         DISTRIBUTOR'S FIRM ORDER, then L&I shall allocate available PRODUCT to
         DISTRIBUTOR in each month that such a shortfall exists in an amount
         equal to the product of (i) the amount of available PRODUCT for that
         month (and in each month thereafter until the shortfall to DISTRIBUTOR
         is remedied) and (ii) a fraction the numerator of which is the
         aggregate quantity of FIRM ORDERS made by DISTRIBUTOR over the
         subsequent twelve (12) month period including the shortfall



                                      19
<PAGE>   20

         months and (y) the aggregate quantity of PRODUCT over the same twelve
         (12) month period required by L&I outside the TERRITORY by reference
         to FIRM ORDERS placed with THIRD PARTY manufacturers for L&I's
         requirements.

6.4      TITLE, RISK.

         (a)      Except as provided in Section 6.1(d), title to FINAL FORM
                  PRODUCT or FILLED PRODUCT sold hereunder shall pass to
                  DISTRIBUTOR when L&I delivers FINAL FORM PRODUCT or FILLED
                  PRODUCT to DISTRIBUTOR. Except as provided in Section 6.1(d),
                  risk of loss of or damage to FINAL FORM PRODUCT or FILLED
                  PRODUCT shall pass to DISTRIBUTOR upon delivery to
                  DISTRIBUTOR. The cost of freight and insurance for delivery
                  of PRODUCT (either as FILLED PRODUCT or as FINAL FORM PRODUCT
                  to DISTRIBUTOR'S designated destination shall be paid by L&I.
                  The common carrier shall be designated by DISTRIBUTOR.

         (b)      In the United States, DISTRIBUTOR shall maintain or cause any
                  person or entity that is in possession of PRODUCT to maintain
                  insurance against loss or destruction of PRODUCT, or in the
                  alternative have in place a reasonable program of self
                  insurance. Insurance premiums for such insurance of
                  DISTRIBUTOR may be deducted from EARNINGS.

6.5      SUPERIORITY OF AGREEMENT.

         The PARTIES agree that the provisions of this AGREEMENT shall prevail
         over any inconsistent statements or terms contained in any other
         documents passing between the PARTIES, such as, but not limited to,
         any purchase order, acknowledgement, confirmation or notice.

6.6      PRICE FOR PROFIT-SHARING TERRITORY.

         The price for PRODUCT sold to DISTRIBUTOR for sale in the PROFIT
         SHARING TERRITORY shall be the COST OF GOODS for FINAL FORM PRODUCT,
         and shall be due and payable within thirty (30) days of invoice
         therefor, which shall be no earlier than date of shipment of FINAL
         FORM PRODUCT.



                                      20
<PAGE>   21
6.7      PRICE FOR OTHER TERRITORY.

         (a)      The price of PRODUCT to be sold in the OTHER TERRITORY shall
                  be the sum of:

                  (i)      The COST OF GOODS for FILLED PRODUCT which shall be
                           due and payable within thirty (30) days of invoice
                           therefor, which shall be no earlier than date of
                           shipment of FILLED PRODUCT ; plus

                  (ii)     Subject to sub-sections 6.7(a)(iii), (iv) and (v)
                           below, ******(9) of NET SALES of PRODUCT for an
                           INDICATION sold in a country in the OTHER TERRITORY.

                  (iii)    In the event that L&I exercises its OPT-OUT OPTION
                           in respect of a PRODUCT for an OTHER NON-CANCER
                           INDICATION, the portion of the price to be paid
                           under Section 6.7(a)(ii) shall be reduced to
                           ******(10).

                  (iv)     In the event that one or more THIRD PARTY(IES) sells
                           a generic equivalent of PRODUCT for an INDICATION in
                           any country of the OTHER TERRITORY in any YEAR in an
                           aggregate amount such that the quantity of units of
                           PRODUCT sold by the generic intruder is equal to at
                           least twenty percent (20%) of DISTRIBUTOR's sales
                           volume of units of PRODUCT for such INDICATION in
                           such country for such YEAR (such test to be
                           calculated using an equivalent volume of PRODUCT per
                           unit, as measured by IMS data, or data of another
                           market research company agreed by the PARTIES if IMS
                           data are not available), the portion of the price to
                           be paid under Section 6.7(a)(ii) above shall be
                           reduced to ******(11) for such PRODUCT for such
                           INDICATION in such country of such YEAR or pro-rated
                           part thereof, as applicable. The adjustment required
                           by the preceding portion of this Section 6.7(a)(iv)
                           shall be made by adjusting the payment for the last
                           CALENDAR QUARTER for the applicable YEAR. In the
                           event that DISTRIBUTOR can demonstrate that the
                           portion of the price paid for PRODUCT for an
                           INDICATION in a country in a YEAR under this Section
                           6.7(a)(iv) is more than ******(12) times the amount
                           earned by DISTRIBUTOR (calculated in a manner similar
                           to EARNINGS), then the payment for that

- -----------------
         (9) "Confidential treatment requested: material has been omitted and
filed Separately with the Commission."
         (10) "Confidential treatment requested: material has been omitted and
filed Separately with the Commission."
         (11) "Confidential treatment requested: material has been omitted and
filed Separately with the Commission."
         (12) "Confidential treatment requested: material has been omitted and
filed Separately with the Commission."


                                      21
<PAGE>   22

                           YEAR for PRODUCT for that INDICATION in such country
                           under this Section 6.7(a)(iv) shall be adjusted by
                           adjusting such payment for the last CALENDAR QUARTER
                           so that such payments for that YEAR are no greater
                           than ******(13) times such earnings. In the event
                           that the circumstances described in Section
                           6.7(a)(iii) and 6.7(a)(iv) both apply, the payment
                           for the relevant YEAR for PRODUCT in the relevant
                           country and relevant INDICATION shall be the lower
                           of the two rates applicable under such two Sections.

                                    (v) In the event that in a CALENDAR QUARTER
                           in a country in the OTHER TERRITORY the sum of the
                           COST OF GOODS (which includes the limitation of
                           Section 6.2(a)) and THIRD PARTY ROYALTIES (including
                           royalties paid pursuant to Section 13.14) for a
                           PRODUCT in such CALENDAR QUARTER exceeds ******(14)
                           of NET SALES in such country, then the amount to be
                           paid therefor under Section 6.7(a)(ii) shall be
                           reduced by subtracting therefrom ******(15) for each
                           one percent by which such sum exceeds ******(16). For
                           example, if the royalty rate is ******(17) and the
                           sum is ******(18), then the ******(19) from Section
                           6.7(a)(ii) is reduced to ******(20). This Section
                           6.7(a)(iv) is not applicable to payments under
                           Section 6.7(a)(ii) that have been reduced under
                           Section 6.7(a)(iv) The adjustment required by this
                           Section 6.7(a)(v) shall be made within sixty (60)
                           days after the end of each YEAR for each applicable
                           CALENDAR QUARTER of such YEAR.

6.8      THIRD PARTY ROYALTIES.

         (a)      In addition to any other payments due under this AGREEMENT in
                  the TERRITORY, DISTRIBUTOR shall reimburse to L&I all THIRD
                  PARTY ROYALTIES for the CLL INDICATION and for OTHER
                  INDICATIONS as to

- --------------------
         (13) "Confidential treatment requested: material has been omitted and
filed Separately with the Commission".
         (14) "Confidential treatment requested: material has been omitted and
filed Separately with the Commission".
         (15) "Confidential treatment requested: material has been omitted and
filed Separately with the Commission".
         (16) "Confidential treatment requested: material has been omitted and
filed Separately with the Commission".
         (17) "Confidential treatment requested: material has been omitted and
filed Separately with the Commission".
         (18) "Confidential treatment requested: material has been omitted and
filed Separately with the Commission".
         (19) "Confidential treatment requested: material has been omitted and
filed Separately with the Commission".
         (20) "Confidential treatment requested: material has been omitted and
filed Separately with the Commission".



                                      22
<PAGE>   23

                  which DISTRIBUTOR retains distribution rights. L&I shall
                  provide to DISTRIBUTOR a schedule specifying when such THIRD
                  PARTY ROYALTIES are payable, and DISTRIBUTOR shall make such
                  payments to L&I at least fifteen (15) days prior to the time
                  that L&I is required to make such THIRD PARTY payment.

         (b)      In the event that it is necessary for L&I to enter into a
                  license agreement with a THIRD PARTY in order for DISTRIBUTOR
                  to be able to sell or continue to sell PRODUCT in the
                  TERRITORY or for L&I to supply PRODUCT to DISTRIBUTOR, L&I
                  shall notify DISTRIBUTOR as soon as it becomes aware of such
                  necessity. L&I shall negotiate such license agreement in good
                  faith taking into account any comments made by DISTRIBUTOR. A
                  THIRD PARTY shall be added to Appendix G only with the
                  consent of DISTRIBUTOR, which consent shall not be
                  unreasonably withheld or delayed. Any disagreement under this
                  Section 6.8(b) as to the reasonableness of adding a THIRD
                  PARTY license to Appendix G shall be resolved by arbitration
                  pursuant to Section 19.6.

         (c)      In the TERRITORY, L&I agrees to pay royalties to a THIRD
                  PARTY to the extent that DISTRIBUTOR has paid L&I royalties
                  pursuant to this Section 6.8. Outside of the TERRITORY, L&I
                  shall make royalty payments that are due under any license
                  agreement that is included in Appendix G.

         (d)      In the event that a THIRD PARTY disputes any royalty payment
                  with respect to PRODUCT in the TERRITORY pursuant to a
                  license of Appendix G, until such dispute is resolved,
                  DISTRIBUTOR shall pay the disputed amount. DISTRIBUTOR and
                  L&I shall cooperate in good faith to resolve such dispute so
                  that DISTRIBUTOR is not obliged to pay THIRD PARTY ROYALTIES
                  which L&I is not contractually obliged to pay under the
                  applicable THIRD PARTY licenses in respect of sales of
                  PRODUCT by DISTRIBUTOR, its AFFILIATES or their
                  SUBDISTRIBUTORS in the TERRITORY.

6.9      PAYMENT FOR PRODUCT.

         The portion of the price for PRODUCT set forth in Section 6.7(a)(ii)
         shall be paid within sixty (60) days after the CALENDAR QUARTER in
         which PRODUCT is sold.

6.10     DELIVERY OF ACCOUNTING.

         (a) Within sixty (60) days after the end of each CALENDAR QUARTER,
         DISTRIBUTOR shall deliver to L&I a full and accurate accounting with
         respect to PRODUCT sold in the OTHER TERRITORY as follows:

                  (i) Quantity of each PRODUCT sold by transaction type (by
         country) by DISTRIBUTOR, and its AFFILIATES and if applicable, it's
         SUBDISTRIBUTORs.

                  (ii) Gross Sales.



                                      23
<PAGE>   24
                  (iii) Calculation of NET SALES (by country) in local
         currency.

                  (iv) Exchange rates for converting each local currency into
         U.S. Dollars for each month of the CALENDAR QUARTER.

                  (v) NET SALES in U.S. dollars in each country.

                  (vi) Calculation of total compensation payable to L&I.

                  (vii) COST OF GOODS to the extent that DISTRIBUTOR is
         claiming a reduction under Section 6.7(a)(v).

                  (viii) To the extent that an adjustment under Section
         6.7(a)(iv) is claimed by DISTRIBUTOR, the information and accounting
         that demonstrates that the requirements of Section 6.7(a)(iv) have
         been met.

                  (ix) Any other information reasonably requested by L&I and
         in the possession of DISTRIBUTOR.

         (b)      To the extent that CALENDAR QUARTER gross sales information
                  of AFFILIATES and SUBDISTRIBUTORS required by Section 6.10(a)
                  is not within the possession of DISTRIBUTOR, then DISTRIBUTOR
                  shall be excused from reporting such gross sales on a
                  CALENDAR QUARTERLY basis and instead for such countries the
                  following information will be submitted in lieu of CALENDAR
                  QUARTERLY gross sales as part of the accounting, with the
                  CALENDAR QUARTERLY accounting for the fourth CALENDAR
                  QUARTER, DISTRIBUTOR shall report total gross sales for the
                  applicable YEAR for at least the MAJOR COUNTRIES and the ten
                  (10) additional countries of the OTHER TERRITORY with the
                  highest NET SALES of PRODUCT; provided, however, that if the
                  NET SALES of the countries of the OTHER TERRITORY for which
                  DISTRIBUTOR reports annual gross sales in lieu of CALENDAR
                  QUARTERLY gross sales, and the countries of the OTHER
                  TERRITORY for which DISTRIBUTOR reports gross sales on a
                  CALENDAR QUARTERLY basis do not equal at least seventy-five
                  percent (75%) of the total NET SALES of the OTHER TERRITORY,
                  then DISTRIBUTOR shall report annual gross sales of such
                  additional countries of the OTHER TERRITORY as shall be
                  necessary such that the countries of the OTHER TERRITORY for
                  which DISTRIBUTOR is reporting gross sales at least on an
                  annual basis equals or exceeds the seventy five percent (75%)
                  test. If the foregoing sentence becomes operative for any
                  country of the OTHER TERRITORY, then DISTRIBUTOR shall
                  promptly make available to L&I a copy of the relevant parts
                  of DISTRIBUTOR'S accounting handbook, which describes how
                  controllers within DISTRIBUTOR'S AFFILIATES are to account
                  for NET SALES.



                                      24
<PAGE>   25


6.11     CURRENCY CONVERSION.

         Payments by DISTRIBUTOR to L&I under this Agreement shall be made in
         U.S. dollars. Except for NET SALES in the United States, where
         payments are based on NET SALES in countries other than the member
         states of the European Currency Union, the amount of such payments
         expressed in the currency of each country shall be converted into Euro
         at the exchange rate of the last date of the applicable CALENDAR
         QUARTER. The applicable exchange rate will be the EURO foreign
         exchange reference spot rate published daily by the European Central
         Bank, Frankfurt / Main. If no EURO foreign exchange reference spot
         rate is determined for the relevant currency, the PARTIES shall agree
         upon another reference rate. Finally, the payable EURO amount shall be
         converted into US Dollars by the EURO foreign exchange reference spot
         rate published by the European Central Bank, Frankfurt / Main, at the
         last day of the applicable CALENDAR QUARTER. These EURO foreign
         exchange reference spot rates are currently published by REUTERS on
         screen "ECB37".

6.12     RECORDKEEPING BY DISTRIBUTOR.

         (a)      DISTRIBUTOR shall keep, and shall cause each of its
                  AFFILIATES to keep, and if applicable, their SUBDISTRIBUTORs,
                  full and accurate books of account containing all particulars
                  that may be necessary for the purpose of calculating NET
                  SALES and all payments payable to L&I for PRODUCT in the
                  OTHER TERRITORY. Such books of account shall be kept at their
                  principal place of business and, with all necessary
                  supporting data shall, for the three (3) years next following
                  the end of the calendar year to which each shall pertain be
                  open for inspection by an independent certified accountant
                  selected by L&I and reasonably acceptable to DISTRIBUTOR upon
                  reasonable notice during normal business hours at L&I's
                  expense for the sole purpose of verifying payments or
                  compliance with this AGREEMENT, but in no event (subject to
                  Section 13.16) more than once in each YEAR. All information
                  and data offered shall be used only for the purpose of
                  verifying payments. In the event that such inspection shall
                  indicate that in any YEAR that the payments which should have
                  been paid by DISTRIBUTOR are at least five percent (5%)
                  greater than those which were actually paid by DISTRIBUTOR,
                  DISTRIBUTOR shall pay the cost of such inspection. All
                  underpayments and overpayments are immediately due and
                  payable.

         (b)      At the request of L&I, DISTRIBUTOR shall provide beginning
                  and ending inventories for each of up to ten (10) countries
                  of the OTHER TERRITORY for a requested YEAR, provided,
                  however, that such request shall be made no more than once
                  each YEAR.

6.13     MANUFACTURER OTHER THAN BI.

         (a)      L&I is currently supplying PRODUCT to DISTRIBUTOR that is
                  manufactured under the BI AGREEMENT. In the event that L&I
                  intends to supply PRODUCT



                                      25
<PAGE>   26

                  to DISTRIBUTOR manufactured by an entity other than BI
                  (either in place of PRODUCT manufactured by BI or in addition
                  to PRODUCT manufactured by BI), then L&I shall provide
                  written notice thereof to DISTRIBUTOR. L&I shall have the
                  right to supply PRODUCT to DISTRIBUTOR manufactured by the
                  entity identified in L&I's notice unless such entity is
                  unsuitable for at least one of the following reasons and
                  within thirty (30) days after receipt of L&I's notice
                  DISTRIBUTOR notifies L&I that it objects to receiving PRODUCT
                  manufactured by the entity identified in L&I's notice for at
                  least one of the following reasons: the proposed manufacturer
                  (i) has a documented history of non-compliance with
                  specifications, laws and regulations governing the
                  manufacture of pharmaceutical products; or (ii) has a
                  documented history of material failure to deliver products in
                  accordance with the customer's delivery schedule; or (iii) is
                  in litigation with DISTRIBUTOR, or DISTRIBUTOR, at the time,
                  in good faith, notifies L&I that DISTRIBUTOR expects to be in
                  litigation with such manufacturer . If L&I disagrees with
                  DISTRIBUTOR that the asserted ground or grounds is
                  applicable, the issue shall be submitted to arbitration under
                  Section 19.6.

         (b)      L&I shall specify, in the notice provided for in sub-section
                  6.13(a) above: (i) its reasons for proposing a change of
                  and/or an additional manufacturer; (ii) a reasonable forecast
                  of the aggregate cost to L&I therefor, including all costs of
                  obtaining regulatory approval of the manufacturer in the
                  TERRITORY; and (iii) the financial and other benefits which
                  L&I expects will result from such a change of manufacturer.
                  Within sixty days of receipt of such notice, DISTRIBUTOR
                  shall notify L&I in writing whether DISTRIBUTOR is willing to
                  bear ******(21) of the costs of effecting such a change of
                  and/or an additional manufacturer. If DISTRIBUTOR is not
                  willing to bear ******(22) of such costs and L&I nevertheless
                  proceeds to make the proposed change, the COST OF GOODS for
                  PRODUCT supplied by such new manufacturer shall be deemed to
                  be the same as the average COST OF GOODS of PRODUCT supplied
                  by BI in the three calendar years preceding such change of
                  and/or an additional manufacturer. If DISTRIBUTOR agrees to
                  bear ******(23) of such costs, L&I shall consult with
                  DISTRIBUTOR on the negotiation of the agreement with the new
                  manufacturer and L&I shall not, without the prior written
                  consent of DISTRIBUTOR, enter into any agreement which
                  provides for costs to L&I and DISTRIBUTOR in excess of those
                  included in the forecast referred to in (ii) above or which
                  includes terms materially more adverse in their effect on
                  DISTRIBUTOR than the terms of the BI Agreement.

         (c)      If DISTRIBUTOR has objected to the alternative or additional
                  manufacturer proposed by L&I pursuant to sub-section 6.13(a)
                  above, then the sixty day period

- ------------------
         (21) "Confidential treatment requested: material has been omitted and
filed Separately with the Commission".
         (22) "Confidential treatment requested: material has been omitted and
filed Separately with the Commission".


                                      26
<PAGE>   27

                  specified in sub-section 6.13(b) above shall not start until
                  DISTRIBUTOR has withdrawn such objection or an arbitrator has
                  decided that DISTRIBUTOR does not have grounds for such
                  objection, whichever is the earlier.

         (d)      In the event that there is a new manufacturer as a result of
                  BI failing to meet BI's obligations under the BI AGREEMENT
                  and/or BI terminating the BI AGREEMENT and/or expiration of
                  the BI AGREEMENT and/or BI not having the capacity to produce
                  PRODUCT forecasted by L&I and/or DISTRIBUTOR, then
                  notwithstanding Section 6.13(b), DISTRIBUTOR shall bear
                  one-third of the cost of effecting a change in and/or
                  providing an additional manufacturer.

         (e)      In the event that L&I intends to change the process for
                  manufacturing PRODUCT, DISTRIBUTOR shall be provided notice
                  thereof as provided in Section 6.13(a). In addition to
                  DISTRIBUTOR'S rights under Section 6.13(a), DISTRIBUTOR shall
                  have the right to object to a manufacturer and/or a change to
                  the process on the basis that it will put the PRODUCT at risk
                  in the marketplace by written objection to L&I within thirty
                  (30) days after such notice from L&I. The PARTIES shall then
                  exert reasonable efforts to insure that such change in
                  process or change in manufacturer does not put the PRODUCT at
                  risk in the marketplace.

6.14     ALTERNATE FORECASTING/ORDERING PROCEDURES.

         In the event that L&I is supplying PRODUCT to DISTRIBUTOR that is
         being manufactured for L&I by a manufacturer other than BI, then
         DISTRIBUTOR shall provide forecasts and place orders under this
         AGREEMENT in a manner that is consistent with the manufacturer's
         requirements.

7.       PAYMENT

7.1      (a)      All payments under this AGREEMENT shall be remitted in
                  immediately available funds.

         (b)      In the event that any payment due hereunder is not made when
                  due, the payment shall accrue interest beginning on the first
                  day of the month following the date when such payment was
                  due, at PRIME plus one percent, the interest being compounded
                  on the last day of each calendar month; provided that in no
                  event shall said annual rate exceed the maximum legal
                  interest rate for corporations. Such payment when made shall
                  be accompanied by all interest accrued. Said interest and the
                  payment and acceptance thereof shall not negate or waive the
                  right of the receiving PARTY to any other remedy, legal or
                  equitable, to which the receiving PARTY may be entitled
                  because of the delinquency of the payment.

8.       BI AGREEMENT



                                      27
<PAGE>   28

8.1      ACTIVITIES UNDER BI AGREEMENT.

         (a)      DISTRIBUTOR has been provided with a copy of the BI AGREEMENT
                  and acknowledges and agrees that PRODUCT to be supplied by
                  L&I to DISTRIBUTOR that will be manufactured and supplied
                  under the BI AGREEMENT is subject to the terms and conditions
                  of the BI AGREEMENT.

         (b)      L&I and DISTRIBUTOR shall agree to Standard Operating
                  Procedures that will give DISTRIBUTOR responsibility for
                  managing logistical and operational details with BI with
                  respect to PRODUCT to be supplied to DISTRIBUTOR that is
                  manufactured under the BI AGREEMENT.

         (c)      L&I agrees to consult with DISTRIBUTOR as material issues
                  arise in the relationship between L&I and BI; provided,
                  however, that L&I shall have the right within its sole
                  discretion to decide and make all decisions with respect to
                  all aspects thereof provided, however, that L&I shall not
                  make any change to the SPECIFICATIONS which could have an
                  effect on the quality of the PRODUCT without the prior
                  written consent of DISTRIBUTOR, such consent not to be
                  unreasonably withheld or delayed. The PARTIES agree that such
                  consultation shall occur in the event that L&I is called upon
                  to give its consent to a manufacturing subcontractor pursuant
                  to Section 2.4 of the BI AGREEMENT, but the final decision
                  with respect thereto is within the sole discretion of L&I.

         (d)      Following execution of this AGREEMENT, the PARTIES will
                  endeavor to negotiate with BI lower minimum purchase
                  requirements and shorter lead times than those currently set
                  forth in the BI AGREEMENT for the submission of forecasts and
                  purchase orders. Initiation and timing of the approach to BI
                  to commence such negotiations, and management of the
                  negotiations, shall be at the sole discretion and under the
                  control of L&I.

8.2      FORECASTS; ORDERS; WARRANTIES.

         For the period during which PRODUCT supplied by L&I to DISTRIBUTOR is
         being manufactured under the BI AGREEMENT:

                                    (i) DISTRIBUTOR agrees to place orders and
                           to make forecasts for PRODUCT in accordance with the
                           requirements of the BI AGREEMENT and that any claims
                           with respect to defective or non-conforming PRODUCT
                           shall be made in accordance with and are governed
                           and limited by the BI AGREEMENT. In particular and
                           without limitation, rolling forecasts and firm
                           orders are to be placed in accordance with Section
                           2.5 of the BI AGREEMENT. In making orders,
                           DISTRIBUTOR shall indicate the quantity of PRODUCT
                           being ordered for the PROFIT SHARING TERRITORY and
                           OTHER TERRITORY, respectively. DISTRIBUTOR shall
                           have the rights set forth in Sections 3.2 and 3.3 of
                           the BI AGREEMENT regarding testing of PRODUCT,



                                      28
<PAGE>   29


                           auditing of BI (subject to the consent of BI), and
                           rejection of defective PRODUCT.

                                    (ii) L&I warrants and represents that the
                           PRODUCT to be supplied to DISTRIBUTOR hereunder
                           corresponds to the SPECIFICATIONS and shall be
                           produced according to current Good Manufacturing
                           Practices standards as of the date and time of
                           production and in accordance with all applicable
                           laws, rules and regulations in the country where
                           produced. L&I further warrants and represents that
                           the PRODUCT shall be delivered to DISTRIBUTOR free
                           and clear of liens and claims which affect title.
                           L&I makes no other warranties and representations
                           with respect to the manufacture of PRODUCT.
                           Notwithstanding anything else to the contrary, L&I's
                           liability with respect to any such warranty or
                           representation is limited to the amount and in the
                           manner set forth in Section 3.6 of the BI AGREEMENT.
                           The warranties and representations of L&I set forth
                           in this Section 8.2(ii) shall not apply to the
                           activities of DISTRIBUTOR performed pursuant to
                           Section 6.2; in such case the warranties and
                           representations of L&I shall apply only to FILLED
                           PRODUCT.

                                    (iii) L&I agrees to provide DISTRIBUTOR
                           with the documentation provided by BI to L&I under
                           Section 3.8 of the BI AGREEMENT.

                                    (iv) In the event that L&I fails to
                           purchase the minimum quantities of PRODUCT specified
                           in Section 2.8 of the BI AGREEMENT and L&I is
                           obligated to pay a surcharge under Section 5.2 of
                           the BI AGREEMENT, then, subject to Section 6.13,
                           DISTRIBUTOR shall pay to L&I the amount of such
                           surcharge ("Surcharge"). The Surcharge paid by
                           DISTRIBUTOR, multiplied by the "Fraction" (as
                           hereinafter defined), shall be COST OF GOODS for the
                           PROFIT SHARING TERRITORY for the applicable YEAR and
                           the remainder thereof shall be COST OF GOODS for the
                           OTHER TERRITORY under Section 6.7(b) of this
                           AGREEMENT. The "Fraction" has as a numerator the NET
                           SALES of PRODUCT by DISTRIBUTOR in the PROFIT
                           SHARING TERRITORY in the applicable YEAR and, as the
                           denominator, NET SALES of PRODUCT in the TERRITORY
                           for the applicable YEAR.

                                    (v) In the event that a payment is due to BI
                           under Section 8.5 of the BI AGREEMENT, DISTRIBUTOR
                           shall pay ******(23) of such amount.

                                    (vi) In the event that L&I receives a
                           credit or no charge replacement of PRODUCT from BI
                           for PRODUCT for which L&I has

- --------------------
         (23) "Confidential treatment requested: material has been omitted and
filed Separately with the Commission".


                                      29
<PAGE>   30

                           received payment from DISTRIBUTOR, L&I will credit
                           DISTRIBUTOR for such amount. Where DISTRIBUTOR
                           notifies L&I of a claim for such credit or no charge
                           replacement under the BI AGREEMENT, L&I will use all
                           reasonable efforts to obtain such credit or no
                           charge replacement to the extent permitted under the
                           BI AGREEMENT.

9.       LOAN.

9.1      (a) DISTRIBUTOR agrees to make a loan to L&I of Thirty million dollars
         ($30,000,000) in the following amounts and at the following times in
         order to assist L&I in meeting L&I's financial obligations under this
         AGREEMENT:

                           (i) ******(24)

                           (ii) ******(25)

                           (iii) ******(26)

                           (iv) ******(27)

                           (v) ******(28) provided, however that DISTRIBUTOR'S
                  obligation to make the payment contemplated by this
                  subsection shall not become due until DISTRIBUTOR'S option to
                  terminate this AGREEMENT pursuant to Section 11.1(c) has
                  expired without DISTRIBUTOR having terminated this AGREEMENT.

                           (vi) ******(29) provided, however, that DISTRIBUTOR'S
                  obligation to make the payment contemplated by this
                  subsection shall not become due until DISTRIBUTOR'S option to
                  terminate this AGREEMENT pursuant to section 11.1(c) has
                  expired without DISTRIBUTOR having terminated this AGREEMENT.

- --------------------
         (24) "Confidential treatment requested: material has been omitted and
filed Separately with the Commission".
         (25) "Confidential treatment requested: material has been omitted and
filed Separately with the Commission".
         (26) "Confidential treatment requested: material has been omitted and
filed Separately with the Commission".
         (27) "Confidential treatment requested: material has been omitted and
filed Separately with the Commission".
         (28) "Confidential treatment requested: material has been omitted and
filed Separately with the Commission".
         (29) "Confidential treatment requested: material has been omitted and
filed Separately with the Commission".


                                      30
<PAGE>   31

         (b)      The loans that are made under Section 9.1(a) shall bear
                  interest at PRIME plus one percent (1%) per annum.

         (c)      To the extent that the outstanding principal of any loan made
                  pursuant to Section 9(a) has not been reduced under Sections
                  12.2 and 12.3, such outstanding principal and any accumulated
                  interest are repayable to DISTRIBUTOR out of L&I's portion of
                  positive EARNINGS payable to L&I pursuant to Section 3.6.

         (d)      L&I shall have no liability for repayment of the loans except
                  in accordance with the provisions of Sections 3.6, 12.2 and
                  12.3.

10.      DEVELOPMENT COMMITTEE

10.1     (a)      The development of PRODUCT in the TERRITORY for INDICATIONS
                  shall be managed and directed by a committee composed of four
                  members, with DISTRIBUTOR appointing two (2) members and L&I
                  two (2) members (the "DEVELOPMENT COMMITTEE"), with a member
                  appointed by L&I being Chairman of the DEVELOPMENT COMMITTEE.

         (b)      The DEVELOPMENT COMMITTEE shall meet at least once each
                  CALENDAR QUARTER at the call of the Chairman in person or by
                  telephone. A quorum for the conduct of business at any
                  meeting of the DEVELOPMENT COMMITTEE shall consist of at
                  least one representative of DISTRIBUTOR and at least one L&I
                  representative. Each of L&I and DISTRIBUTOR shall have one
                  vote, and all decisions shall be reached by a unanimous vote.
                  The PARTIES shall cause the DEVELOPMENT COMMITTEE to review
                  and vote on each submitted DEVELOPMENT PLAN, PRELIMINARY WORK
                  PLAN and PRELIMINARY WORK PLAN.

         (c)      The DEVELOPMENT COMMITTEE shall review each approved
                  DEVELOPMENT PLAN at least once each YEAR or at the request of
                  any member, and shall decide whether or not to amend the
                  DEVELOPMENT PLAN.

         (d)      If there is a tie vote in the DEVELOPMENT COMMITTEE as to a
                  DEVELOPMENT PLAN or any amendment thereto, or PRELIMINARY
                  DEVELOPMENT PLAN or PRELIMINARY WORK PLAN, L&I and
                  DISTRIBUTOR agree to exert all reasonable efforts to arrive
                  at a mutually acceptable resolution, including a meeting
                  between the Head of the Therapeutics SBU of DISTRIBUTOR and a
                  manager of the General Partner of L&I. If such a dispute
                  relates to OTHER INDICATIONS and resolution is not reached
                  within thirty (30) days, then dispute resolution shall be as
                  set forth in Section 12 for the particular INDICATION under
                  discussion.



                                      31
<PAGE>   32

11.      DEVELOPMENT FOR CLL INDICATIONS

11.1     (a)      With respect to PRODUCT for the CLL INDICATION, L&I shall
                  bear the cost and expense of the CLINICAL TRIAL and shall
                  exert commercially reasonable efforts to complete the
                  CLINICAL TRIAL. If the CLINICAL TRIAL is successful, L&I
                  shall bear the cost and expense for filing and obtaining
                  approval of a BLA in the United States based on such CLINICAL
                  TRIAL, and shall exert commercially reasonable efforts to
                  file and obtain such BLA.

         (b)      If the CLINICAL TRIAL is not successful, or if a BLA is not
                  approved in the United States based solely on the CLINICAL
                  TRIAL, and DISTRIBUTOR and/or L&I reasonably believe that
                  additional clinical work should be done to obtain BLA
                  approval for the CLL INDICATION, then at the option of L&I,
                  L&I shall either (i) pay the expense of such additional
                  clinical work to obtain BLA approval for the CLL INDICATION;
                  or (ii) L&I and DISTRIBUTOR shall initiate good-faith
                  negotiations to reach agreement with respect to L&I and
                  DISTRIBUTOR sharing the expenses of such clinical work and an
                  appropriate reduction in the APPROPRIATE PERCENTAGE for
                  PRODUCT for the CLL INDICATION.

         (c)      In the event that a BLA is obtained in the United States or a
                  BLA equivalent is obtained from the EMEA, in either case for
                  the CLL INDICATION, and if DISTRIBUTOR concludes that the
                  labeling is such that the PRODUCT that is the subject of such
                  BLA or BLA equivalent is not commercially viable, then
                  DISTRIBUTOR shall have the right to do one of the following,
                  by written notice to L&I, within thirty (30) days after
                  receipt from L&I of notice of such BLA or such BLA equivalent
                  approval and a copy of all approval correspondence received
                  by L&I from the applicable AGENCY:

                           i) Terminate this AGREEMENT, in which case
                  DISTRIBUTOR shall not be required to make the loan payments
                  under (x) Section 9(a)(v), if the termination is made within
                  thirty (30) days after receipt from L&I of the notice and
                  correspondence described above relating to BLA approval; or
                  (y) under Section 9(a)(vi) if the termination is made within
                  thirty (30) days after receipt from L&I of the notice and
                  correspondence described above relating to BLA equivalent
                  approval; or

                           (ii) Request L&I to perform additional clinical work
                  to extend the label for the CLL INDICATION, in which case
                  DISTRIBUTOR shall reimburse L&I for ******(30) of such
                  DEVELOPMENT EXPENSES on a CALENDAR QUARTER basis as such
                  expenses are incurred, within thirty (30) days after receipt
                  of an invoice therefor; provided, however, that such

- -----------------
         (30) "Confidential treatment requested: material has been omitted and
filed Separately with the Commission."


                                      32
<PAGE>   33


                  DEVELOPMENT EXPENSES shall not exceed a total of four million
                  dollars ($4,000,000) without the consent of both PARTIES.

         (d)      With respect to PRODUCT for the CLL INDICATION, L&I shall
                  exert commercially reasonable efforts to obtain EMEA approval
                  therefor in Europe and L&I shall bear the cost and expense
                  thereof. Pricing approvals, if any, shall be obtained at the
                  cost and expense of DISTRIBUTOR.

         (e)      In Europe, L&I shall use commercially reasonable efforts to
                  obtain EMEA approval for PRODUCT for the extension of the CLL
                  INDICATION in accordance with Appendix D. L&I shall pay all
                  of the DEVELOPMENT EXPENSES therefor, provided, however, that
                  DISTRIBUTOR shall pay to L&I ******(31) of such DEVELOPMENT
                  EXPENSES on a quarterly basis as such expenses are incurred,
                  within thirty (30) days of invoice therefor.

         (f)      With respect to PRODUCT for the CLL INDICATION in countries
                  of the TERRITORY other than the United States and those
                  countries covered by the EMEA, L&I shall exert commercially
                  reasonable efforts to develop and obtain regulatory approval
                  therefor in any country where DISTRIBUTOR desires to market
                  the PRODUCT. L&I shall pay the DEVELOPMENT EXPENSES therefor
                  and DISTRIBUTOR shall reimburse L&I for ******(32) of such
                  DEVELOPMENT EXPENSES on a quarterly basis as such expenses
                  are incurred, within thirty (30) days of receipt of an
                  invoice therefor. In the event that L&I materially fails to
                  exert commercially reasonable efforts to develop and obtain
                  regulatory approval of the PRODUCT for the CLL INDICATION in
                  one or more countries of the TERRITORY as provided in this
                  Section 11.1(f), DISTRIBUTOR may, after forty-five (45) days
                  prior written notice to L&I, undertake such development and
                  approval and complete it at DISTRIBUTOR'S own expense if
                  during such notice period L&I has not begun to carry out such
                  work in a manner reasonably likely to accomplish the desired
                  objective. DISTRIBUTOR shall be entitled to commercially
                  reasonable assistance from L&I to accommodate DISTRIBUTOR'S
                  efforts, including providing data and study reports in the
                  possession of L&I, if necessary to permit the exercise by
                  DISTRIBUTOR of its rights under this Section 11.1(f).
                  ******(33) of all costs reasonably incurred by DISTRIBUTOR in
                  carrying out activities under this Section shall be
                  reimbursed to DISTRIBUTOR by L&I on a CALENDAR QUARTER basis
                  as such expenses are incurred following receipt by L&I of
                  DISTRIBUTOR'S invoice therefor, or may be deducted by
                  DISTRIBUTOR

- -----------------------
         (31) "Confidential treatment requested: material has been omitted and
filed Separately with the Commission."
         (32) "Confidential treatment requested: material has been omitted and
filed Separately with the Commission."
         (33) "Confidential treatment requested: material has been omitted and
filed Separately with the Commission."


                                      33
<PAGE>   34
                  from any payments due from DISTRIBUTOR to L&I under this
                  AGREEMENT, at the option of DISTRIBUTOR. The remedy provided
                  in this Section 11.1(f) shall be the sole remedy for L&I's
                  failure to perform L&I's obligations under this Section
                  11.1(f).

12.      DEVELOPMENT FOR OTHER INDICATIONS

12.1     (a)      Any PARTY shall have the right to propose to the DEVELOPMENT
                  COMMITTEE that the PRODUCT be studied for an OTHER
                  INDICATION. Proposals to the DEVELOPMENT COMMITTEE concerning
                  the study of an OTHER CANCER INDICATION shall be initiated by
                  submitting a DEVELOPMENT PLAN to the DEVELOPMENT COMMITTEE.
                  Proposals to the DEVELOPMENT COMMITTEE concerning the study
                  of an OTHER NON-CANCER INDICATION shall be initiated by
                  submitting either a PRELIMINARY WORK PLAN or a DEVELOPMENT
                  PLAN to the DEVELOPMENT COMMITTEE.

         (b)      With regard to an OTHER CANCER INDICATION, the PARTIES must
                  both agree to the DEVELOPMENT PLAN or the OTHER CANCER
                  INDICATION will not be developed. If a DEVELOPMENT PLAN for
                  an OTHER CANCER INDICATION is approved by the DEVELOPMENT
                  COMMITTEE, then L&I shall perform the work under the
                  DEVELOPMENT PLAN and pay one hundred percent (100%) of the
                  DEVELOPMENT EXPENSES. DISTRIBUTOR shall pay to L&I ******(34)
                  of such DEVELOPMENT EXPENSES on a CALENDAR QUARTER basis as
                  such expenses are incurred, within thirty (30) days of
                  receipt of L&I's invoice therefor.

         (c)      With regard to an OTHER NON-CANCER INDICATION:

                  (i)      If either PARTY submits a PRELIMINARY WORK PLAN for
                           an OTHER NON-CANCER INDICATION to the DEVELOPMENT
                           COMMITTEE, the DEVELOPMENT COMMITTEE shall decide
                           whether to approve the PRELIMINARY WORK PLAN. For
                           the first five (5) YEARS, if the DEVELOPMENT
                           COMMITTEE cannot agree whether to approve such a
                           PRELIMINARY WORK PLAN, then the decision of L&I
                           shall control. After the first five (5) YEARS, work
                           under such a PRELIMINARY WORK PLAN shall not proceed
                           unless the PARTIES agree. Aggregate funding under
                           such PRELIMINARY WORK PLANS for the first five (5)
                           YEARS shall not exceed one million dollars
                           ($1,000,000) per YEAR without the consent of both
                           PARTIES. L&I shall perform the work under the
                           PRELIMINARY WORK PLAN and pay one hundred percent
                           (100%) of the DEVELOPMENT EXPENSES.

- --------------------
         (34) "Confidential treatment requested: material has been omitted and
filed separately with the Commission".


                                      34
<PAGE>   35

                           DISTRIBUTOR shall pay to L&I ******(35) of such
                           DEVELOPMENT EXPENSES on a CALENDAR QUARTER basis as
                           such expenses are incurred, within thirty (30) days
                           of receipt of L&I's invoice therefor.

                  (ii)     With respect to OTHER NON-CANCER INDICATIONS, no
                           DEVELOPMENT PLAN shall be submitted to the
                           DEVELOPMENT COMMITTEE in advance of each PARTY being
                           supplied with a PRELIMINARY DEVELOPMENT PLAN. If
                           either PARTY submits such a DEVELOPMENT PLAN to the
                           DEVELOPMENT COMMITTEE, the DEVELOPMENT COMMITTEE
                           shall decide whether to approve the DEVELOPMENT
                           PLAN. During the first five (5) YEARS, if the
                           PARTIES cannot agree the decision of L&I shall
                           control. After the first five (5) years, both
                           PARTIES must agree to such a DEVELOPMENT PLAN. If a
                           DEVELOPMENT PLAN is approved by the DEVELOPMENT
                           COMMITTEE, either because the DEVELOPMENT COMMITTEE
                           reached agreement, or during the first five (5)
                           YEARS, because of the decision of L&I, L&I shall
                           perform the work under the DEVELOPMENT PLAN and pay
                           one hundred percent (100%) of the DEVELOPMENT
                           EXPENSES. DISTRIBUTOR shall pay to L&I ******(36) of
                           such DEVELOPMENT EXPENSES on a CALENDAR QUARTER
                           basis as such expenses are incurred, within thirty
                           (30) days of receipt of L&I's invoice therefor.
                           Within thirty (30) days of approval of the
                           DEVELOPMENT PLAN by the DEVELOPMENT COMMITTEE or, at
                           any time thereafter, by ninety (90) days' prior
                           written notice, either PARTY shall have the right to
                           serve notice on the other PARTY that it will not
                           fund its portion of the DEVELOPMENT EXPENSES as
                           described in the previous two sentences (the "OPT
                           OUT OPTION"). If the DISTRIBUTOR chooses to fund its
                           portion of DEVELOPMENT EXPENSES under an approved
                           DEVELOPMENT PLAN, then it shall have equal
                           participation with L&I in the design of clinical
                           protocols and conduct of activities under the
                           DEVELOPMENT PLAN.

                  (iii)    The decisions of the PARTIES to pay their portion of
                           DEVELOPMENT EXPENSES or to exercise their OPT OUT
                           OPTIONS shall have the following consequences:

         (A)      In the event that DISTRIBUTOR elects to fund DEVELOPMENT
                  EXPENSES and L&I exercises its OPT OUT OPTION for PRODUCT for
                  an OTHER NON-CANCER INDICATION, then L&I shall perform the
                  work under the DEVELOPMENT PLAN for such INDICATION and
                  DISTRIBUTOR shall pay for one hundred percent (100%) of the
                  DEVELOPMENT EXPENSES, which

- --------------------
         (35) "Confidential treatment requested: material has been omitted and
filed Separately with the Commission".
         (36) "Confidential treatment requested: material has been omitted and
filed Separately with the Commission".


                                      35
<PAGE>   36

                  shall be due and payable on a CALENDAR QUARTER basis as such
                  expenses are incurred, within thirty (30) days after receipt
                  of L&I's invoice therefor.

         (B)      In the event that DISTRIBUTOR exercises its OPT OUT OPTION
                  with respect to such a DEVELOPMENT PLAN, then any and all
                  rights of DISTRIBUTOR under this AGREEMENT for PRODUCT for
                  the OTHER NON-CANCER INDICATION of the DEVELOPMENT PLAN shall
                  be terminated upon receipt of such notice.

         (C)      Subject to DISTRIBUTOR making the payments due from
                  DISTRIBUTOR under Section 12.1(b) and (c)(ii) and
                  (c)(iii)(A), as the case may be, L&I shall use commercially
                  reasonable efforts to develop and obtain regulatory approval
                  for PRODUCT for each OTHER NON-CANCER INDICATION in each
                  country of the TERRITORY for which there is a DEVELOPMENT
                  PLAN for PRODUCT for such OTHER NON-CANCER INDICATION, all in
                  accordance with the applicable DEVELOPMENT PLAN.

         (D)      If after DISTRIBUTOR exercises it OPT OUT OPTION L&I decides
                  to offer rights to a THIRD PARTY for such PRODUCT for such
                  OTHER NON-CANCER INDICATION after completion of clinical
                  studies, L&I shall provide written notice thereof to
                  DISTRIBUTOR and if DISTRIBUTOR is interested in obtaining
                  such rights as evidenced by written notice from DISTRIBUTOR
                  within thirty (30) days thereafter, then L&I will negotiate
                  with DISTRIBUTOR for a period of one month in an attempt to
                  enter into an agreement with DISTRIBUTOR with respect to such
                  rights, but neither DISTRIBUTOR nor L&I shall be obligated to
                  enter into such an agreement. If the PARTIES have not entered
                  into an agreement within thirty (30) days after initiating
                  such negotiation, L&I shall have the right to offer or grant
                  rights to any person or entity on any terms or conditions
                  within the sole discretion of L&I.

         (E)      If after DISTRIBUTOR exercises its OPT OUT OPTION with
                  respect to PRODUCT for an OTHER NON-CANCER INDICATION and if
                  prior to initiating clinical studies there is a substantial
                  change to the DEVELOPMENT PLAN in effect at the time of the
                  election, L&I shall provide written notice thereof to
                  DISTRIBUTOR and if DISTRIBUTOR is interested in developing
                  PRODUCT for such OTHER NON-CANCER INDICATION as evidenced by
                  written notice from DISTRIBUTOR within thirty (30) days
                  thereafter, then L&I will negotiate with DISTRIBUTOR for a
                  period of one month in an attempt to enter into an agreement
                  with DISTRIBUTOR with respect to such rights, but neither
                  DISTRIBUTOR nor L&I shall be obligated to enter into such an
                  agreement. If the parties have not entered into an agreement
                  within thirty (30) days after initiating such negotiation,
                  L&I shall have the right to offer or grant rights to any
                  person or entity on any terms or conditions within the sole
                  discretion of L&I.



                                      36
<PAGE>   37

         (F)      At the time of approval of a DEVELOPMENT PLAN for PRODUCT for
                  an OTHER NON-CANCER INDICATION which is to be funded by both
                  L&I and DISTRIBUTOR, L&I and DISTRIBUTOR shall agree to a
                  plan by which L&I or DISTRIBUTOR is to receive a royalty for
                  PRODUCT for such OTHER NON-CANCER INDICATION in the event
                  that L&I or DISTRIBUTOR exercises, as the case may be, its
                  right to terminate funding of a DEVELOPMENT PLAN for PRODUCT
                  for such OTHER INDICATION after an agreed to amount of money
                  has been spent under the DEVELOPMENT PLAN for such OTHER
                  NON-CANCER INDICATION. It is understood that if L&I
                  terminates funding, such royalty shall be in addition to any
                  other payments to which L&I is entitled under this AGREEMENT
                  and the determined royalty shall be the same for L&I and
                  DISTRIBUTOR.

         (G)      If DISTRIBUTOR exercises its OPT OUT OPTION with respect to
                  PRODUCT for an OTHER NON-CANCER INDICATION, L&I's development
                  thereof, if any, shall not be subject to the authority of the
                  DEVELOPMENT COMMITTEE.

         (H)      Within forty-five (45) days after L&I obtains approval to
                  market PRODUCT for an OTHER NON-CANCER INDICATION in the
                  United States or a MAJOR COUNTRY of the TERRITORY, whichever
                  is earlier, DISTRIBUTOR shall pay to L&I, the PAYMENT AMOUNT
                  for PRODUCT for such OTHER NON-CANCER INDICATION, provided
                  that at such time DISTRIBUTOR'S right to distribute PRODUCT
                  for such OTHER NON-CANCER INDICATION has not been terminated.
                  The amount paid at such time shall be based on a good faith
                  estimate at the time of the PAYMENT AMOUNT as made by a THIRD
                  PARTY agreed to by L&I and DISTRIBUTOR and the payment shall
                  be adjusted upwardly or downwardly at the time that the
                  actual PAYMENT AMOUNT can be determined by DISTRIBUTOR by
                  either paying an additional amount to L&I or L&I refunding
                  any excess amount paid. It is expressly understood that the
                  payment of this Section 12.1(c)(iii)(H) shall be paid only
                  once for each of the rheumatoid arthritis, transplantation
                  and multiple sclerosis INDICATIONS.

         (I)      With respect to a proposed DEVELOPMENT PLAN for an OTHER
                  NON-CANCER INDICATION, if the DEVELOPMENT PLAN is directed to
                  developing PRODUCT with the same formulation and/or with the
                  same strength as PRODUCT for the CLL INDICATION or an OTHER
                  CANCER INDICATION that is then being developed or distributed
                  under this AGREEMENT, then L&I shall provide objective
                  evidence to DISTRIBUTOR that it is commercially unreasonable
                  to develop PRODUCT for such INDICATION with a different
                  strength and/or formulation, as the case may be. Within
                  thirty (30) days thereafter, DISTRIBUTOR shall notify L&I in
                  writing whether or not it agrees with L&I. If DISTRIBUTOR
                  disagrees, then DISTRIBUTOR shall provide with such notice
                  the reasons for such disagreement. If DISTRIBUTOR and L&I do
                  not resolve such disagreement, then either PARTY can submit
                  the disagreement to arbitration pursuant to Section 19.6. If
                  DISTRIBUTOR agrees with L&I, or L&I's position is determined
                  to be correct in



                                      37
<PAGE>   38

                  an arbitration pursuant to Section 19.6, and DISTRIBUTOR
                  exercises its OPT-OUT OPTION, the provisions of Section
                  13.6(a)(vi) shall not be applicable to PRODUCT for such
                  INDICATION, as set forth in such DEVELOPMENT PLAN.

         (J)      If DISTRIBUTOR exercises its OPT-OUT OPTION with respect to a
                  PRODUCT for an OTHER NON-CANCER INDICATION after initiation
                  of development thereof under a DEVELOPMENT PLAN, then the
                  provisions of Section 13.6(a)(vi) shall not be applicable to
                  PRODUCT for such INDICATION, as set forth in such DEVELOPMENT
                  PLAN.

12.2     LOAN REDUCTIONS

         With respect to any portion of DEVELOPMENT EXPENSES paid by L&I
         pursuant to Section 11 or Section 12 that DISTRIBUTOR is not obligated
         to reimburse pursuant to Sections 11 or 12 ("Non-Reimbursed Portion")
         to the extent that there is any unpaid principal on loans made to L&I
         pursuant to Section 9, DISTRIBUTOR shall forgive the outstanding
         principal amount of such loan and any interest thereon in an amount
         equal to such "Non-Reimbursed Portion" upon receipt of an invoice
         therefor from L&I.

12.3.    FURTHER LOAN REDUCTIONS

         DISTRIBUTOR shall credit to L&I an amount equal to ten percent (10%)
         of DEVELOPMENT EXPENSES paid by L&I under Sections 11 and 12 (whether
         or not reimbursed by DISTRIBUTOR) by reducing the outstanding
         principal amount of any loan made by DISTRIBUTOR to L&I pursuant to
         Section 9 effective upon receipt of an invoice therefor from L&I.

12.4     DISTRIBUTOR AUDIT RIGHTS

         L&I shall keep and shall cause each of its AFFILIATES and its and
         their contractors to keep full and accurate records and books of
         account containing all particulars that may be necessary for the
         purpose of calculating DEVELOPMENT EXPENSES to be charged to
         DISTRIBUTOR pursuant to this AGREEMENT. Such books of account shall be
         kept at their principal places of business and, with all necessary
         supporting data shall, for the three (3) years next following the end
         of the calendar year to which each shall pertain be open for
         inspection by an independent certified accountant selected by
         DISTRIBUTOR and reasonably acceptable to L&I upon reasonable notice
         during normal business hours at DISTRIBUTOR'S expense for the sole
         purpose of verifying charges in compliance with this AGREEMENT, but in
         no event more than once each calendar year. All information and data
         offered shall be used only for the purpose of verifying charges to
         DISTRIBUTOR. In the event that such inspection shall indicate that in
         any calendar year the charges which were paid by DISTRIBUTOR were
         overstated by at least five percent (5%), then L&I shall pay the cost
         of the inspection. All underpayments and overpayments are immediately
         due and payable.



                                      38
<PAGE>   39

12.5     L&I shall have the right to have work performed on its behalf under
         Section 12 by a THIRD PARTY provided, however, that L&I shall be
         responsible for the work performed by a THIRD PARTY.

13.      OTHER RESPONSIBILITIES

13.1     COMPLIANCE WITH LAW.

         In distributing marketing and selling of PRODUCT in the TERRITORY,
         DISTRIBUTOR shall comply with all provisions of the laws, rules and
         regulations applicable in the TERRITORY.

13.2     PROHIBITION ON EXPORTS.

         DISTRIBUTOR agrees not to export PRODUCT outside the TERRITORY without
         the express permission of L&I. L&I agrees not to sell or permit the
         sale in the TERRITORY by THIRD PARTIES of PRODUCT for an INDICATION
         for which DISTRIBUTOR has distribution rights in the TERRITORY.

13.3     NEGATION OF PARTNERSHIP; ETC.

         The appointment of DISTRIBUTOR hereunder shall not create a joint
         venture, or any employer-employee relationship or principal-agency
         relationship between L&I and DISTRIBUTOR. Nothing under this AGREEMENT
         shall be deemed to authorize DISTRIBUTOR to act for, represent, or
         bind L&I or any of its AFFILIATES. Nothing under this AGREEMENT shall
         be deemed to authorize L&I to act for, represent, or bind DISTRIBUTOR
         or any of its AFFILIATES. This AGREEMENT does not create a partnership
         for United States federal income tax purposes (as defined in Section
         761 of the United States Internal Revenue Code), for any United States
         state or local jurisdiction, or in any country other than the United
         States. Therefore there is no requirement to file Form 1065, United
         States Partnership Return of Income, any similar United States state
         or local income tax return, or any similar document with tax
         authorities in any other country.

13.4     CONFIDENTIALITY.

         (a)      During the term of this AGREEMENT, it is contemplated that a
                  PARTY will disclose to the other PARTY proprietary and
                  confidential technology, specifications, technical
                  information and the like which are owned or controlled by or
                  licensed to a PARTY ("Confidential Information"). The
                  receiving PARTY agrees to retain the disclosing PARTY's
                  Confidential Information in confidence and not to disclose
                  any such Confidential Information to a THIRD PARTY without
                  the prior written consent of the disclosing PARTY and to use
                  the disclosing PARTY's Confidential Information only for the
                  purposes of this AGREEMENT. The obligations of
                  confidentiality will not apply to Confidential Information
                  which:



                                      39
<PAGE>   40

                                    (i) was known to the receiving PARTY or
                           generally known to the public prior to its
                           disclosure hereunder;

                                    (ii) subsequently becomes known to the
                           public by some means other than a breach of this
                           AGREEMENT;

                                    (iii) is subsequently disclosed to the
                           receiving PARTY by a THIRD PARTY having a lawful
                           right to make such disclosure, or is developed by
                           the receiving PARTY independently of the disclosure
                           of the disclosing PARTY;

                                    (iv) is required by law or bona fide legal
                           process to be disclosed provided that the receiving
                           PARTY takes all reasonable steps to restrict and
                           maintain confidentiality of such disclosure and
                           provides reasonable prior notice to the disclosing
                           PARTY;

                                    (v) is approved for release by the PARTIES;
                           or

                                    (vi) is preclinical or clinical data or
                           other information concerning PRODUCT which
                           DISTRIBUTOR is reasonably required to disclose to
                           consultants (such as advertising agencies,
                           reimbursement experts and marketing research
                           companies), customers, healthcare professionals,
                           consumers or regulatory agencies as part of its
                           routine advertising or promotional activities or
                           medical education, professional services, adverse
                           event investigation and reporting, or PRODUCT
                           quality or complaint investigation and reporting
                           functions, or which is disclosed by DISTRIBUTOR to
                           AFFILIATES and SUBDISTRIBUTORS in order to allow
                           them to market and sell PRODUCT in their respective
                           countries of the TERRITORY as permitted by this
                           AGREEMENT (provided that such AFFILIATES and
                           SUBDISTRIBUTORS agree to be bound by the
                           confidentiality obligations set forth in this
                           Section).

         (b)      Upon termination or expiration of this AGREEMENT, each PARTY
                  shall return to the other PARTY all tangible forms of
                  Confidential Information furnished by the other PARTY,
                  including all copies thereof and all memoranda of oral
                  disclosure, except that each PARTY may retain one copy in its
                  files to ensure compliance with any legal obligations.

         (c)      This Section shall survive until the tenth anniversary of the
                  termination or expiration of this AGREEMENT.

         (d)      With respect to Confidential Information that is know-how
                  under the BTG AGREEMENT, DISTRIBUTOR agrees to maintain the
                  confidentiality thereof in accordance with the DISTRIBUTOR
                  BTG LETTER.



                                      40
<PAGE>   41

         (e)      Publicity Review. Neither PARTY shall originate any written
                  publicity, news release, or other announcement or statement
                  relating to this AGREEMENT, performance hereunder, or the
                  existence of an arrangement between the PARTIES (collectively
                  a "Written Disclosure"), without the prompt prior review and
                  written approval of the other PARTY, which approval shall not
                  be unreasonably withheld or delayed. Notwithstanding the
                  foregoing, either PARTY may make any public Written
                  Disclosure it believes in good faith based upon the advice of
                  counsel is required by applicable law, rule or regulation or
                  any listing or trading agreement concerning its or its
                  AFFILIATES publicly traded securities; provided, however,
                  that such Written Disclosure shall minimize to the extent
                  possible the financial information disclosed, and that prior
                  to making such Written Disclosure, the disclosing PARTY shall
                  provide to the other party a copy of the materials proposed
                  to be disclosed and provide the receiving PARTY with an
                  opportunity to promptly review the Written Disclosure.

13.5     APPOINTMENT OF AUTHORIZED AGENT.

                           (a) As promptly as possible following the first
                           approval of a BLA for PRODUCT by FDA, L&I shall, to
                           the fullest extent possible, authorize DISTRIBUTOR
                           in writing to represent L&I for purposes of dealing
                           with APLS in regard to all of DISTRIBUTOR'S
                           activities with respect to the distribution of the
                           PRODUCT in the United States (which appointment
                           DISTRIBUTOR shall acknowledge in writing).
                           DISTRIBUTOR'S activities to market and promote the
                           PRODUCT will continue to be conducted as an
                           independent contractor and not as a promotional
                           agent of L&I. To the extent permitted by FDA,
                           DISTRIBUTOR shall have authority to deal with APLS
                           concerning all matters regulated by APLS in
                           connection with DISTRIBUTOR'S activities as
                           distributor of the PRODUCT, including without
                           limitation submission of advertising and promotional
                           materials and responding (orally and in written
                           form) to FDA questions, observations and complaints
                           concerning DISTRIBUTOR'S advertising and promotional
                           materials for PRODUCT. In the event that FDA
                           contacts L&I concerning matters that have been
                           delegated to DISTRIBUTOR pursuant to this Section,
                           L&I shall attempt to refer FDA to DISTRIBUTOR (and
                           if such attempt is unsuccessful, shall immediately
                           notify and, to the extent possible in the
                           circumstances, permit DISTRIBUTOR to intervene with
                           FDA and handle the matter).

                           (b) While acting under Section (a) above,
                           DISTRIBUTOR shall copy L&I on all correspondence to
                           FDA contemporaneously with the submission of such
                           correspondence to FDA (including full copies of all
                           advertising and promotional materials), shall
                           promptly copy L&I on all correspondence received
                           from FDA; shall contact L&I the day of receipt of
                           any communication from FDA that relates to or
                           threatens imposition of any penalty; and shall
                           promptly copy L&I on all contact reports prepared by
                           DISTRIBUTOR concerning any phone calls or meetings
                           with FDA.



                                      41
<PAGE>   42

                           (c) If at any point DISTRIBUTOR ceases to be the
                           distributor of PRODUCT in the United States, then
                           DISTRIBUTOR shall promptly resign this authority to
                           represent L&I upon written notice from L&I, and L&I
                           shall promptly so notify FDA in writing.

                           (d) If the PARTIES are not successful in having
                           DISTRIBUTOR authorized to represent L&I in these
                           matters before ALPS as set forth in Section 13.5
                           (a), then this Section 13.5 (d) shall be applicable.
                           L&I shall promptly inform DISTRIBUTOR of
                           communications with FDA concerning DISTRIBUTOR'S
                           advertising and promotional materials and promptly
                           provide DISTRIBUTOR with copies of FDA
                           correspondence. Prior to communicating with FDA
                           about DISTRIBUTOR'S advertising and promotional
                           materials, L&I shall consult with DISTRIBUTOR, and
                           shall transmit the DISTRIBUTOR position on the
                           applicable matter to FDA. To the extent permitted by
                           FDA, L&I shall include DISTRIBUTOR in all meetings
                           and conference calls with FDA relating to
                           DISTRIBUTOR'S advertising and promotional materials,
                           and during such meetings and conference calls shall
                           not make proposals or accede to FDA proposals which
                           have not been previously cleared with DISTRIBUTOR.
                           L&I shall promptly provide to DISTRIBUTOR copies of
                           all L&I contact reports and meeting minutes relating
                           to interaction with FDA relating to DISTRIBUTOR
                           advertising and promotional materials. Written
                           submissions to FDA concerning DISTRIBUTOR'S
                           advertising and promotional materials shall be
                           prepared by DISTRIBUTOR and submitted by L&I. L&I
                           shall keep DISTRIBUTOR promptly informed of the
                           status of matters at FDA involving DISTRIBUTOR'S
                           advertising and promotional materials.

                           (e) The rights and obligations of DISTRIBUTOR under
                           this Section 13.5 shall be exercised by
                           DISTRIBUTOR'S United States AFFILIATE.

13.6     EXCLUSIVITY PROTECTION FOR DISTRIBUTOR.

         (a)      L&I will not:

                  (i)      except as permitted by this AGREEMENT, sell PRODUCT
                           in a country for an INDICATION for which DISTRIBUTOR
                           is then distributing the PRODUCT, or for which
                           DISTRIBUTOR is entitled to distribute the PRODUCT,
                           under this AGREEMENT;

                  (ii)     encourage in any way the off label use of the
                           PRODUCT in a country for any INDICATION for which
                           DISTRIBUTOR is then distributing the PRODUCT, or for
                           which DISTRIBUTOR is entitled to distribute PRODUCT,
                           under this AGREEMENT;


                                      42
<PAGE>   43
                  (iii)    other than for the benefit of and at the express
                           request of DISTRIBUTOR, sponsor or otherwise support
                           medical education or similar programs designed to
                           foster use of the PRODUCT in a country for any
                           INDICATION for which DISTRIBUTOR is then
                           distributing the PRODUCT, or for which DISTRIBUTOR
                           is entitled to distribute the PRODUCT, under this
                           AGREEMENT;

                  (iv)     other than for the benefit of and at the express
                           request of DISTRIBUTOR, seek approval in a country
                           of the OTHER NON-CANCER INDICATION by way of a
                           supplement or amendment of any BLA or foreign
                           equivalent under which DISTRIBUTOR is distributing
                           the PRODUCT, or for which DISTRIBUTOR is entitled to
                           distribute the PRODUCT, under this AGREEMENT;

                  (v)      market the PRODUCT under the TRADEMARK;

                  (vi)     except for the benefit of and at the express request
                           of DISTRIBUTOR, sell PRODUCT for an OTHER NON-CANCER
                           INDICATION by way of a PRODUCT with the same package
                           size as the PRODUCT being distributed by DISTRIBUTOR
                           and subject to Section 12.1(c)(iii)(I) and (J) with
                           the same formulation or strength as the PRODUCT
                           being distributed by DISTRIBUTOR.

         (b)      In the event that DISTRIBUTOR can demonstrate by objective
                  proof that PRODUCT distributed by L&I or any licensee or
                  distributor of L&I other than DISTRIBUTOR is being used for
                  an INDICATION for which DISTRIBUTOR retains distribution
                  rights granted by L&I, and that for any CALENDAR QUARTER in a
                  country of the TERRITORY such use exceeds five percent (5%)
                  of DISTRIBUTOR'S sales of PRODUCT for such CALENDAR QUARTER,
                  then within thirty (30) days of such demonstration by
                  DISTRIBUTOR and within thirty (30) days of each CALENDAR
                  QUARTER thereafter that such use exceeds five percent (5%),
                  L&I shall pay to DISTRIBUTOR, a sum equal to ******(37) of the
                  gross sales of L&I, or the licensee or distributor of L&I, as
                  applicable, of the amount of such PRODUCT that is used for
                  such INDICATION in such country for such CALENDAR QUARTER.
                  Any dispute arising under this Section shall be resolved by
                  binding arbitration pursuant to Section 19.6. DISTRIBUTOR'S
                  remedy hereunder is without prejudice to L&I's obligations
                  pursuant to Section 13.6(a).

         (c)      L&I will cause its distributors and licensees of any OTHER
                  NON-CANCER INDICATION to agree in writing to the terms of
                  Section 13.6(a) and (b), and will provide a copy of such
                  writing to DISTRIBUTOR promptly following its

- -----------------------
         (37) "Confidential treatment requested: material has been omitted and
filed Separately with the Commission".


                                      43
<PAGE>   44

                  execution. DISTRIBUTOR will be named a third party
                  beneficiary of such writing, with the right to seek legal
                  remedies to enforce the terms of such writing.

13.7     EXCLUSIVITY PROTECTION FOR L&I.

         (a)      DISTRIBUTOR will not market or sell PRODUCT other than
                  pursuant to the rights granted to and retained by DISTRIBUTOR
                  under this AGREEMENT.

         (b)      DISTRIBUTOR will not encourage in any way the off label use
                  of the PRODUCT sold by DISTRIBUTOR for any INDICATION in any
                  country for which DISTRIBUTOR does not have or no longer has
                  distribution rights under this AGREEMENT.

         (c)      DISTRIBUTOR will not sponsor or otherwise support medical
                  education or similar programs designed to foster use of the
                  PRODUCT in any country for any INDICATION for which
                  DISTRIBUTOR does not have or no longer has distribution
                  rights under this AGREEMENT.

         (d)      In the event that L&I can demonstrate by objective proof that
                  PRODUCT distributed by DISTRIBUTOR is being used for an
                  INDICATION in a country for which DISTRIBUTOR no longer has
                  distribution rights under this AGREEMENT and that such use of
                  such PRODUCT for such INDICATION in such country for any
                  CALENDAR QUARTER exceeds five percent (5%) of L&I's (or its
                  distributor's or licensee's) sales of PRODUCT for such
                  CALENDAR QUARTER in such country, then within thirty (30)
                  days of such demonstration by L&I and within thirty (30) days
                  of each CALENDAR QUARTER thereafter that such situation
                  exists, DISTRIBUTOR shall pay to L&I, a sum equal to
                  ******(38) of the gross sales of DISTRIBUTOR of the amount of
                  PRODUCT that is used for such INDICATION in such country in
                  such CALENDAR QUARTER. Any dispute arising under this Section
                  shall be resolved by binding arbitration pursuant to Section
                  19.6. L&I's remedy hereunder is without prejudice to
                  DISTRIBUTOR'S obligations pursuant to Section 13.7(a).

13.8     OWNERSHIP OF REGULATORY LICENSES.

         L&I shall own all regulatory licenses for PRODUCT in the TERRITORY.

13.9     AFFILIATES AND SUBDISTRIBUTORS.

         DISTRIBUTOR and L&I may each perform its obligations and exercise its
         rights under this AGREEMENT personally or thorough one or more
         AFFILIATES, although DISTRIBUTOR or L&I as the case may be shall
         nonetheless be solely responsible for the

- ------------------
         (38) "Confidential treatment requested: material has been omitted and
filed Separately with the Commission."



                                      44
<PAGE>   45

         performance of its AFFILIATES with respect to such obligations
         performed by an AFFILIATE. DISTRIBUTOR shall not permit any of its
         AFFILIATES to commit any act (including any act of omission) which
         DISTRIBUTOR is prohibited hereunder from committing directly. Subject
         to Section 2.3, DISTRIBUTOR may perform its obligations and exercise
         its rights under this AGREEMENT personally or through one or more
         SUBDISTRIBUTORS, although DISTRIBUTOR shall nonetheless be solely
         responsible for the performance of its SUBDISTRIBUTORS. DISTRIBUTOR
         shall not permit any SUBDISTRIBUTOR to commit any act (including any
         act of omission) which DISTRIBUTOR is prohibited hereunder from
         committing directly. DISTRIBUTOR warrants and guarantees that all of
         its AFFILIATES, and its SUBDISTRIBUTORS will perform in accordance
         with this AGREEMENT as if they were signatories to this AGREEMENT.
         DISTRIBUTOR shall be liable to L&I for any breach of this AGREEMENT by
         any of its AFFILIATES or SUBDISTRIBUTORS. L&I shall not permit any of
         its AFFILIATES to commit any act that L&I is prohibited from
         performing under this AGREEMENT.

13.10    REPORTS.

         (a)      In addition to the reports, record-keeping and accounting
                  required by other portions of this AGREEMENT, DISTRIBUTOR
                  covenants and agrees that DISTRIBUTOR will provide L&I with
                  the reports, information and forecasts required by clauses
                  6.6, 8.1,16.5.1, and 16.5.3 of the BTG AGREEMENT to the
                  extent only that such reports, information and forecasts
                  relate to PRODUCT for INDICATIONS for which DISTRIBUTOR has
                  distribution rights in the TERRITORY. L&I shall not, without
                  the prior written consent of DISTRIBUTOR (such consent not to
                  be unreasonably withheld or delayed) agree with BTG to any
                  amendment to the BTG AGREEMENT which would increase the
                  obligations to be assumed by DISTRIBUTOR under this Section
                  13.10 beyond those existing on the EFFECTIVE DATE.

         (b)      As soon as practicable following signature of this AGREEMENT,
                  L&I shall procure for DISTRIBUTOR the opportunity (together
                  with L&I) to explain to BTG DISTRIBUTOR's sales
                  accounting system. L&I and DISTRIBUTOR agree to use
                  reasonable commercial efforts to achieve agreement with BTG
                  that BTG will accept DISTRIBUTOR's reporting of sales
                  information pursuant to Section 6.10 of this AGREEMENT as
                  satisfactory performance by DISTRIBUTOR of the obligations of
                  L&I pursuant to Section 8.1 of the BTG Agreement.

13.11    PATENT MARKINGS.

         DISTRIBUTOR agrees to include appropriate patent markings specified by
         L&I on FINAL FORM PRODUCT distributed under this AGREEMENT.



                                      45
<PAGE>   46


13.12    PRECLINICAL AND CLINICAL DATA.

         Promptly following the Effective Date, L&I shall provide to
         DISTRIBUTOR copies of all preclinical and clinical data available to
         L&I relating to PRODUCT. Promptly following BLA filing, L&I shall
         provide a copy of the BLA to DISTRIBUTOR, and following BLA approval,
         shall promptly provide to DISTRIBUTOR any changed sections of the BLA.
         Thereafter, L&I shall promptly provide to DISTRIBUTOR any supplements
         to the BLA and any correspondence with FDA concerning the BLA. The
         requirements of this Section shall also apply to foreign equivalents
         of the BLA, except that duplicate information need not be furnished to
         DISTRIBUTOR more than once.



13.13    INFRINGEMENT BY THIRD PARTIES.

         In the event that in a country of the TERRITORY a THIRD PARTY is
         selling PRODUCT for an INDICATION for which DISTRIBUTOR retains rights
         under this AGREEMENT, and such sale infringes a patent owned by or
         licensed to L&I, the PARTIES shall consult with each other as to the
         appropriate action. If, after such consultation, DISTRIBUTOR and L&I
         desire to initiate an infringement action, to the extent that L&I has
         the right to do so, L&I shall initiate and prosecute such infringement
         action taking into account DISTRIBUTOR'S comments. The cost and
         expense of such action and any recovery therefrom shall be split
         between L&I and DISTRIBUTOR on the basis of ****** ******(39)
         respectively. If one PARTY wishes to proceed and the other PARTY does
         not, that PARTY may proceed at its own cost, retaining all recovery
         therefrom. To the extent that any patent is licensed under the BTG
         AGREEMENT, this Section 13.13 is subject to clause 19 of the BTG
         AGREEMENT.

13.14    INFRINGEMENT OF THIRD PARTY RIGHTS.

         In the event that any THIRD PARTY brings or threatens to bring an
         action against L&I and/or DISTRIBUTOR (or one of their respective
         AFFILIATES, or in the case of DISTRIBUTOR, a SUBDISTRIBUTOR) alleging
         that the manufacture or sale or use of PRODUCT in the TERRITORY for an
         INDICATION for which DISTRIBUTOR has distribution rights constitutes
         an infringement of such THIRD PARTY'S patent or other intellectual
         property rights, L&I and DISTRIBUTOR shall consult on how best to
         defend or settle such action. L&I shall have the right to handle the
         defense of such action, but if L&I fails to do so, L&I shall permit
         DISTRIBUTOR to handle such defense. Any damages awarded to such THIRD
         PARTY and all costs of defending such action shall be borne (i) by L&I
         and DISTRIBUTOR in the PROFIT SHARING TERRITORY in the ratio of
         ******(40) respectively and (ii) only by DISTRIBUTOR in the OTHER

- ------------------
         (39) "Confidential treatment requested: material has been omitted and
filed Separately with the Commission."
         (40) "Confidential treatment requested: material has been omitted and
filed Separately with the Commission."


                                      46
<PAGE>   47

         TERRITORY, and any royalties paid by DISTRIBUTOR to a THIRD PARTY for
         the OTHER TERRITORY as a result of such action shall be THIRD PARTY
         ROYALTIES under Section 6.7(a)(v). Neither PARTY may enter into a
         settlement of such action without the consent of the other, such
         consent not to be unreasonably withheld or delayed.

13.15    SUPERIORITY OF INDEMNITY PROVISIONS.

         To the extent that any provision of Section 13.14 is inconsistent with
         the indemnity provisions of Section 15, the provisions of Section
         13.14 shall prevail.

13.16    COORDINATION OF INSPECTION RIGHTS.

         L&I shall use reasonable efforts to coordinate the inspection rights
         of Sections 3.8 and 6.12 of this AGREEMENT with BTG so that if BTG and
         L&I are to each inspect in a YEAR that such inspection shall occur at
         the same time, provided, however, that under each such section, L&I
         and BTG may each individually and separately conduct inspection once a
         YEAR.

14.      TRADEMARK AND TRADE DRESS

14.1     DISTRIBUTOR acknowledges L&I's ownership in or license to the
         TRADEMARK and agrees that any and all uses thereof by DISTRIBUTOR in
         distributing PRODUCT under this AGREEMENT shall (i)inure to the
         benefit of L&I and/or its licensor; (ii)be in a manner that does not
         adversely affect the TRADEMARK and/or L&I'S and/or its licensor's
         interest therein. .

14.2     DISTRIBUTOR agrees that DISTRIBUTOR will not use the TRADEMARK except
         on PRODUCT distributed by DISTRIBUTOR under and in accordance with the
         terms and conditions of this AGREEMENT.

14.3     In any country in the TERRITORY in which DISTRIBUTOR retains
         distribution rights to PRODUCT under this AGREEMENT, L&I will not
         grant rights to a THIRD PARTY to the TRADEMARK and will not use the
         TRADEMARK with respect to any product.

14.4     The packaging and trade dress for PRODUCT shall be consistent with the
         trade dress used by DISTRIBUTOR for distributing DISTRIBUTOR'S other
         products and shall be approved by both L&I and DISTRIBUTOR and shall
         be in accordance with all applicable laws, rules and regulations
         applicable thereto.

14.5     In the event that in any country of the TERRITORY, it is required or
         desirable that DISTRIBUTOR, its AFFILIATES or their SUBDISTRIBUTORS be
         recorded as an authorized user of the TRADEMARK, the PARTIES shall
         cooperate with each other to effect same.



                                      47
<PAGE>   48


15.      INDEMNITY

15.1     INDEMNIFICATION BY DISTRIBUTOR FOR NEGLIGENCE, WILLFUL MISCONDUCT, OR
         BREACH.

         DISTRIBUTOR shall indemnify and hold harmless L&I and its AFFILIATES
         and their licensors (including, but not limited to, BTG and its
         licensor) and their respective employees, agents, officers, managers,
         partners and directors and each of them (an "L&I Indemnified Party")
         from and against any and all THIRD PARTY claims, causes of action,
         losses, damages and costs (including reasonable attorney's fees) of
         any nature made or asserted against an L&I Indemnified Party or
         lawsuits or other proceedings filed or otherwise instituted against a
         L&I Indemnified Party, in each case by a THIRD PARTY (hereinafter
         individually and collectively (an) "L&I Loss(es)") resulting from or
         arising out of the packaging, use, marketing or sale by DISTRIBUTOR
         its AFFILIATES or their SUBDISTRIBUTORS of PRODUCT in the TERRITORY,
         but solely to the extent that such L&I Loss(es) arise out of or result
         from the (i) negligence or willful misconduct of DISTRIBUTOR, or the
         breach by DISTRIBUTOR of any of its representations or warranties or
         obligations or covenants hereunder and/or (ii) the negligence or
         willful misconduct of or breach of obligations or covenants hereunder
         by AFFILIATES of DISTRIBUTOR or SUBDISTRIBUTORS of DISTRIBUTOR or its
         AFFILIATES in performing under or pursuant to or exercising rights
         under this AGREEMENT.

15.2     INDEMNIFICATION BY L&I FOR NEGLIGENCE, WILLFUL MISCONDUCT, OR BREACH.

         L&I shall indemnify and hold harmless DISTRIBUTOR and its AFFILIATES
         and their SUBDISTRIBUTORS, and their respective employees, agents,
         officers, managers, partners and directors and each of them (a
         "DISTRIBUTOR Indemnified Party") from and against any and all THIRD
         PARTY claims, causes of action, losses, damages and costs (including
         reasonable attorney's fees) of any nature made or asserted against
         a DISTRIBUTOR Indemnified Party, in each case by a THIRD PARTY
         (hereinafter individually and collectively (a) "DISTRIBUTOR Loss(es)"
         resulting from or arising out of the manufacture, use, marketing or
         sale of PRODUCT in the TERRITORY but solely to the extent that such
         DISTRIBUTOR Loss(es) arise out of or result from (i) the negligence or
         willful misconduct of L&I, or the breach by L&I of any of its
         representations or warranties or obligations or covenants hereunder
         and/or (ii) the negligence or willful misconduct of or breach of
         obligations or covenants hereunder by AFFILIATES of L&I in performing
         under or pursuant to or exercising rights under this AGREEMENT.

15.3     GENERAL INDEMNIFICATION BY DISTRIBUTOR.

         DISTRIBUTOR shall indemnify and hold harmless any and all L&I
         Indemnified Party(ies) from and against any and all L&I Losses
         resulting from or arising out of the use, marketing or sale by
         DISTRIBUTOR its AFFILIATES or their SUBDISTRIBUTORS of PRODUCT in the
         TERRITORY to the extent that such L&I Loss(es) are not within the
         provisions of Sections 15.1 or 15.2 and to the extent that such



                                      48
<PAGE>   49


         L&I Loss(es) exceed any amount recoverable by L&I Indemnified
         Party(ies) under any applicable L&I Indemnified Party(ies) insurance;
         provided, however, that DISTRIBUTOR'S liability under this section 15.3
         shall not exceed ******(41) of such L&I Loss(es) in the PROFIT SHARING
         TERRITORY and ******(42) of such L&I Losses in the OTHER TERRITORY.

15.4     GENERAL INDEMNIFICATION BY L&I.

         L&I shall indemnify and hold harmless any and all DISTRIBUTOR
         Indemnified Party(ies) from and against any and all DISTRIBUTOR
         Loss(es) resulting from or arising out of the manufacture, use,
         marketing, or sale of the PRODUCT in the TERRITORY to the extent that
         such DISTRIBUTOR Loss(es) are not within the provisions of Section
         15.1 or 15.2 and to the extent that such DISTRIBUTOR Loss(es) exceed
         any amount recoverable by DISTRIBUTOR Indemnified Party(ies) under any
         applicable DISTRIBUTOR Indemnified Party(ies) insurance; provided,
         however, that L&I's liability under this section 15.4 shall not exceed
         ******(43) of such DISTRIBUTOR Loss(es) in the PROFIT SHARING TERRITORY
         and ******(44)of such DISTRIBUTOR Losses in the OTHER TERRITORY.

15.5     CONDITIONS TO INDEMNIFICATION.

         A person or entity that intends to claim indemnification under this
         Section 15 (the "Indemnitee") shall promptly notify the other party
         (the "Indemnitor") of any DISTRIBUTOR Loss(es) or L&I Loss(es) as the
         case may be in respect of which the Indemnitee intends to claim such
         indemnification. Indemnitor shall have the right to control the
         defense of any DISTRIBUTOR Loss(es) or L&I Loss(es) as the case may be
         as to which the obligation to indemnify the Indemnitee has been
         acknowledged by the Indemnitor in writing under Section 15.1 or 15.2.
         Under Sections 15.3 and 15.4, L&I shall have the right to control the
         defense in the PROFIT SHARING TERRITORY and DISTRIBUTOR shall have
         such right in the OTHER TERRITORY. The indemnity agreement in this
         Section 15 shall not apply to amounts paid in settlement of any loss,
         claim, damage, liability or action if such settlement is effected
         without the consent of the Indemnitor, which consent shall not be
         withheld or delayed unreasonably. The failure to deliver notice to the
         Indemnitor within a reasonable time after the commencement of any such
         action, only if prejudicial to its ability to defend such action,
         shall relieve such Indemnitor of any liability to the Indemnitee under
         this Section 15, but the omission so to deliver notice to the
         Indemnitor will not relieve it of any liability that it may have to
         any

- -----------------
         (42) "Confidential treatment requested: material has been omitted and
filed Separately with the Commission".
         (43) "Confidential treatment requested: material has been omitted and
filed Separately with the Commission".
         (44) "Confidential treatment requested: material has been omitted and
filed Separately with the Commission".


                                      49
<PAGE>   50

         Indemnitee otherwise than under this Section 15. The Indemnitee under
         this Section 15, its employees and agents, shall cooperate fully with
         the Indemnitor and its legal representatives in the investigations and
         defense of any action, claim or liability covered by this
         indemnification. The Indemnitee shall have the right to participate in
         the defense of such action.

15.6     INSURANCE.

         Each PARTY agrees to obtain and maintain in effect a policy or
         policies of insurance covering its indemnity obligations hereunder.
         Such policies shall be issued by one or more reputable insurers
         reasonably acceptable to the other PARTIES, and shall contain terms of
         coverage reasonably acceptable to the other PARTIES. The policy limits
         of the policy or policies obtained shall be at least one million
         dollars ($1,000,000). Upon the request of any other PARTY to this
         Agreement, each PARTY shall provide evidence of insurance coverage in
         compliance with this Section to the other PARTIES. In lieu of the
         insurance coverage described above, any PARTY shall have the right to
         undertake a program of self-insurance to cover its indemnity
         obligations hereunder, with financial protection at least equivalent
         to the policy limits described above; provided, however, that such
         program of self-insurance shall be reasonably acceptable to the other
         PARTY to this Agreement. The obligations described in this Section
         shall survive the termination or expiration of this AGREEMENT and
         continue to bind the PARTIES for five (5) years after the expiration
         date of the last PRODUCT commercialized by DISTRIBUTOR in any country
         of the TERRITORY pursuant to this AGREEMENT.


16.      ADVERSE REACTIONS; COMPLAINTS

16.1     PREPARATION OF STANDARD OPERATING PROCEDURE.

         (a)      Promptly following the execution of this AGREEMENT the
                  PARTIES agree to enter into a standard operating procedure to
                  govern collection, investigation and reporting to regulatory
                  authorities of PRODUCT-related adverse drug experience
                  reports, quality reports, and complaint reports, such that
                  all of the PARTIES can comply with their legal obligations
                  worldwide. The standard operating procedure will be promptly
                  amended as changes in legal obligations require.

16.2     AGENCY ACTION.

         The PARTIES agree to notify each other as soon as possible of any
         information received by a PARTY regarding any threatened or pending
         action by an AGENCY which may affect the safety or efficacy claims of
         PRODUCT or the continued marketing of such PRODUCT.



                                      50
<PAGE>   51


16.3     RECALLS.

         (a)      If any governmental authority having jurisdiction requires or
                  reasonably requests any PARTY to recall any PRODUCT due to a
                  defect in the manufacture, processing, packaging or labeling
                  of PRODUCT or for any other reason whatsoever, such PARTY
                  shall immediately notify all of the other PARTIES to this
                  AGREEMENT. EITHER PARTY shall also have the right to initiate
                  this recall procedure absent a request from a governmental
                  authority after consultation with the other PARTY, provided,
                  however, that if L&I decides to initiate a recall in the
                  OTHER TERRITORY and DISTRIBUTOR does not agree to such
                  recall, then ******(45) of the cost and expense thereof shall
                  be paid by L&I and ******(46) by DISTRIBUTOR.

         (b)      Prior to commencing any recall, DISTRIBUTOR shall review with
                  L&I the proposed manner in which the recall is to be carried
                  out. DISTRIBUTOR agrees to follow any reasonable advice of
                  L&I as to the manner of completing the recall, so long as
                  such advice is agreeable to the governmental authority
                  involved, if any.

                  DISTRIBUTOR shall carry out the recall in the manner agreed
                  upon between L&I and DISTRIBUTOR in as expeditious a manner
                  as possible and in such a way as to cause the least
                  disruption to the sales of the PRODUCT and to preserve the
                  goodwill and reputation attached to the PRODUCT and to the
                  names of DISTRIBUTOR, LEUKOSITE, ILEX and L&I.

         (c)      DISTRIBUTOR agrees that appropriate records and procedures
                  will be maintained to permit a recall of PRODUCT.

         (d)      Subject to Section 16.3(a) and deduction against EARNINGS as
                  a RECALL EXPENSE, DISTRIBUTOR shall pay for and bear the cost
                  and expense of any recall under this Section 16.3.

17.      WARRANTIES

17.1     MUTUAL WARRANTY.

         Each party warrants and represents that it has the full right and
         authority to enter into this AGREEMENT and that it is not aware of any
         impediment which would inhibit its ability to perform the terms and
         conditions imposed on it.

- ----------------------
         (45) "Confidential treatment requested: material has been omitted and
filed Separately with the Commission".
         (46) "Confidential treatment requested: material has been omitted and
filed Separately with the Commission".


                                      51
<PAGE>   52


17.2     L&I WARRANTIES.

         (a)      L&I warrants and represents that

                  (i) as of the Effective Date the BTG AGREEMENT is in full
         force and effect; prior to the Effective Date L&I has provided
         DISTRIBUTOR with an accurate and complete copy of the BTG AGREEMENT,
         including all amendments thereto and documents incorporated therein by
         reference.

                  (ii) as of the Effective Date, neither L&I nor LEUKOSITE has
         received any notice from BTG that either LEUKOSITE or L&I is presently
         in breach of the BTG AGREEMENT;

                  (iii) during the term of the AGREEMENT neither L&I nor
         LEUKOSITE will amend the BTG AGREEMENT in a manner that materially
         affects DISTRIBUTOR'S rights or obligations under this AGREEMENT
         without the prior written consent of DISTRIBUTOR. For the avoidance of
         doubt, the PARTIES agree that any charge resulting in an increase in
         payments payable by DISTRIBUTOR hereunder shall constitute a change
         which materially affects DISTRIBUTOR'S rights;

                  (iv) during the term of this AGREEMENT, L&I and LEUKOSITE
         will make all payments required by the BTG AGREEMENT, when due
         provided that with respect to the BTG AGREEMENT in the TERRITORY,
         DISTRIBUTOR has met DISTRIBUTOR'S obligations under Section 6.8;

                  (v) as of the Effective Date, without having made an
         investigation, L&I has no knowledge of a granted patent in the
         TERRITORY which would be infringed by the manufacture, use or sale of
         PRODUCT for the INDICATIONS in the TERRITORY, provided, however, that
         this warranty is not applicable to the patents licensed under the BTG
         AGREEMENT or to those of Appendix E;

                  (vi) as of the Effective Date, L&I has not received any
         notices of infringement of THIRD PARTY patent rights by the
         manufacture, use or sale of PRODUCT for the INDICATIONS in the
         TERRITORY;

                  (vii) as of the Effective Date, L&I has not received an
         opinion of counsel that any patent owned by L&I or licensed to L&I
         under the BTG AGREEMENT relating to the manufacture, use or sale of
         PRODUCT for the INDICATIONS in the TERRITORY is invalid or
         unenforceable;

                  (viii) as of the Effective Date of this AGREEMENT, it has
         made available to DISTRIBUTOR all information in L&I's, LEUKOSITE'S
         and ILEX'S possession or control or of which it is aware as of the
         Effective Date, concerning safety, efficacy, side effects, or toxicity
         of the PRODUCT, or sensitivity reactions to the PRODUCT, associated
         with any clinical use, studies, investigations, or tests of the
         PRODUCT (animal or human), whether or not determined to be
         attributable to the PRODUCT;



                                      52
<PAGE>   53
                  (ix) it has conducted or has caused its contractors or
         consultants to conduct and will in the future conduct, the preclinical
         and clinical studies of the PRODUCT, which, in all material respects,
         is in accordance with applicable United States law, known or published
         standards of the FDA and EMEA, and the scientific standards applicable
         to the conduct of studies in the United States and the European Union,
         including without limitation for the United States Good Laboratories
         Practices regulations, Good Manufacturing Practices Regulations, and
         Good Clinical Practices guidelines;

                  (x) it has not employed (and, to the best of its knowledge,
         has not used a contractor or consultant that has employed) and in the
         future will not employ (or, to the best of its knowledge, use any
         contractor or consultant that employs) any individual or entity
         debarred by the FDA (or subject to a similar sanction of EMEA), or, to
         the best knowledge of L&I, any individual who or entity which is the
         subject of an FDA debarment investigation or proceeding (or similar
         proceeding of EMEA), in the conduct of the preclinical or clinical
         studies of the PRODUCT; and

                  (xi) it is the owner or licensee of the TRADEMARK in the
countries set forth in Appendix F.

17.3     NEGATION OF OTHER REPRESENTATIONS AND WARRANTIES.

         EXCEPT AS OTHERWISE EXPRESSLY SET FORTH IN THIS AGREEMENT NEITHER
         PARTY MAKES ANY REPRESENTATION OR EXTENDS ANY WARRANTIES OF ANY KIND
         EITHER EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, WARRANTIES
         OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR VALIDITY OF
         ANY PATENTS ISSUED OR PENDING.

17.4     THIRD PARTY LICENSES.

         In negotiating THIRD PARTY licenses , L&I will use its commercially
         reasonable efforts to obtain a consent (a "Consent") from L&I's
         licensors of Appendix G. Such Consent shall contain the agreement of
         such licensor to (i) give reasonable written notice to DISTRIBUTOR
         prior to terminating the underlying license or contract; (ii) provide
         DISTRIBUTOR a reasonable period to cure any default under such license
         or contract; and (iii) if the licensor seeks to terminate the license
         to L&I, to grant the license to DISTRIBUTOR on the same terms as it
         was granted to L&I. The failure to obtain such a consent shall not be
         a breach of this AGREEMENT.

17.5     DISTRIBUTOR PAYMENTS UNDER BTG AGREEMENT.

                           (a) In the event that L&I fails to make a payment
                  that is due and payable under the BTG AGREEMENT, and
                  DISTRIBUTOR makes such payment to BTG on behalf of L&I, then
                  L&I shall pay such amount to DISTRIBUTOR,



                                      53
<PAGE>   54
                  unless such amount is an amount that DISTRIBUTOR should have
                  paid and did not pay to L&I under Section 6.8 of this
                  AGREEMENT.

                           (b) In the event that there is a breach of the BTG
                  AGREEMENT or a notice of termination thereof, DISTRIBUTOR and
                  L&I shall cooperate with each other to cure such breach
                  and/or obtain a withdrawal of the notice of termination, as
                  the case may be provided, however, that DISTRIBUTOR shall
                  have the right within its sole discretion to decide if, when
                  and how to exercise its rights under the BTG CONSENT LETTER.

18.      TERM AND TERMINATION

18.1     TERM.

         This AGREEMENT is effective as of the date first above written and,
         unless sooner terminated as provided herein, shall continue for as
         long as DISTRIBUTOR is distributing the PRODUCT in the TERRITORY.

18.2     AGREEMENT TERMINATION.

         This AGREEMENT may be terminated by either PARTY if:

         (a)      (i) the other PARTY fails to observe, perform or otherwise
                  breaches any of its material covenants, agreements or
                  obligations under this AGREEMENT in any material respect and
                  (ii) such failure continues for a period of thirty (30) days
                  after receipt by the other party of notice thereof from the
                  party specifying such failure. In the event of a non-monetary
                  breach, if the breach is not reasonably capable of being
                  cured within the thirty (30) day period, and the breaching
                  PARTY is making a good faith effort to cure the breach, the
                  notifying PARTY may not terminate this AGREEMENT pursuant to
                  this subsection without a further ninety (90) days elapsing
                  from the original notice of breach without the breach having
                  been cured.

         (b)      the other party files or institutes bankruptcy,
                  reorganization, liquidation, receivership or similar
                  proceedings under any debt relief laws or fails for more than
                  sixty (60) days to take steps to oppose the initiation of
                  such actions against it.

18.3     USE OF PRODUCT AFTER TERMINATION.

         Upon the termination of this AGREEMENT under Section 18.2 or 18.6 for
         any reason other than for breach of this AGREEMENT by DISTRIBUTOR,
         DISTRIBUTOR shall have the right to sell all PRODUCT in inventory at
         the time of termination. All such sales of PRODUCT shall be subject to
         the terms of this AGREEMENT, as in effect immediately prior to
         termination. If this AGREEMENT terminates for any breach by
         DISTRIBUTOR, then L&I may at its discretion buy back all or part of
         the PRODUCT that remain in the possession of DISTRIBUTOR and are in
         good condition with a reasonable remaining shelf life. All PRODUCT
         which is not repurchased by L&I within



                                      54
<PAGE>   55

         four (4) weeks after termination shall be immediately destroyed by
         DISTRIBUTOR at DISTRIBUTOR'S expense. Upon termination of this
         AGREEMENT, DISTRIBUTOR shall discontinue use of the TRADEMARK and
         discontinue marketing and sale of PRODUCT, except in connection with
         any sale of inventory as provided in this Section.

18.4     NO LOAN REPAYMENT.

         Without limiting in any way DISTRIBUTOR's rights to recover damages
         from L&I in contract or tort or otherwise arising out of any breach by
         L&I of this AGREEMENT, upon termination of this AGREEMENT for any
         reason whatsoever, DISTRIBUTOR shall not be entitled to repayment of
         any loans or payments made to L&I under this AGREEMENT, with the
         outstanding loan amounts and any unpaid interest thereon being a fee
         for termination of this AGREEMENT.

18.5     REPURCHASE OF CERTAIN PRODUCT.

         (a)      L&I shall purchase from DISTRIBUTOR any PRODUCT that was
                  purchased by DISTRIBUTOR from L&I under Section 6.1(d) that
                  is in the possession of DISTRIBUTOR at COST OF GOODS therefor
                  in the event that (a) DISTRIBUTOR terminates this AGREEMENT
                  under Section 11.1(c) or Section 18.6 or under Section 18.2
                  as a result of a breach thereof by L&I ; or, (b) if this
                  AGREEMENT is not terminated in the event that any such
                  PRODUCT cannot be commercially sold.

         (b)      If L&I is obligated to purchase PRODUCT under Section
                  18.5(a), L&I shall have the right to pay such amount in
                  twelve (12) equal consecutive CALENDAR QUARTERLY installments
                  commencing on the date that is thirty (30) days after (i) the
                  date of DISTRIBUTOR'S termination notice; or (ii) if the
                  AGREEMENT is not terminated the date of DISTRIBUTOR'S notice
                  to L&I that the PRODUCT cannot be sold, as applicable, plus
                  interest on the unpaid balance at PRIME plus one percent. If
                  this AGREEMENT has not been terminated to the extent that any
                  such PRODUCT can be reworked and relabeled in accordance with
                  applicable law, rules or regulation, DISTRIBUTOR and L&I
                  shall use reasonable efforts to rework and relabel such
                  PRODUCT (at the expense of L&I) and if as reworked and
                  relabeled, the PRODUCT lawfully can be commercially sold in
                  the United States; L&I shall not be required to purchase such
                  PRODUCT.

18.6     TERMINATION OF BTG AGREEMENT.

         (a)      In the event that the BTG AGREEMENT is terminated and
                  DISTRIBUTOR exercises the rights granted to DISTRIBUTOR by
                  BTG under the BTG CONSENT LETTER to become a licensee of BTG,
                  then this AGREEMENT shall remain in full force and effect and
                  DISTRIBUTOR and L&I shall make such amendments to this
                  AGREEMENT as are required to meet DISTRIBUTOR'S obligations
                  under the BTG AGREEMENT to enable DISTRIBUTOR to continue to
                  sell the PRODUCT under the AGREEMENT while preserving the
                  economic



                                      55
<PAGE>   56

                  terms of this AGREEMENT for both L&I and SCHERING. In the
                  event that the BTG Agreement is terminated and DISTRIBUTOR
                  does not exercise its rights to become a licensee of BTG
                  pursuant to the BTG CONSENT LETTER, then DISTRIBUTOR shall
                  have the right to terminate this AGREEMENT.

         (b)      A termination of the BTG AGREEMENT shall not be a breach of
                  this AGREEMENT and L&I shall have no liability to DISTRIBUTOR
                  for a termination of the BTG AGREEMENT.

         (c)      In the event that the BTG AGREEMENT is terminated and
                  DISTRIBUTOR becomes a licensee of BTG pursuant to the terms
                  of the BTG CONSENT LETTER, then to the extent permitted by
                  the license between DISTRIBUTOR and BTG, L&I shall have the
                  right to manufacture or have PRODUCT manufactured for sale to
                  DISTRIBUTOR.

         (d)      If DISTRIBUTOR exercises its rights to become a licensee of
                  BTG, DISTRIBUTOR acknowledges that it is becoming such a
                  licensee under the terms and conditions of the BTG AGREEMENT
                  and agrees that it will not amend the BTG AGREEMENT in a
                  manner that materially affects L&I's rights or obligations
                  under this AGREEMENT without the prior written consent of
                  L&I.

18.7     EFFECT ON OUTSTANDING OBLIGATIONS.

         The termination of this AGREEMENT shall not affect any then
         outstanding obligations of DISTRIBUTOR or L&I hereunder, including but
         not limited to any payments owed under the provisions of this
         AGREEMENT while it was in effect and payment for binding and partially
         binding orders under Section 6 and 8.2(i) (but subject to Section
         18.5), nor preclude either PARTY from pursuing all rights and remedies
         it may have at law or in equity with respect to any breach of this
         AGREEMENT nor prejudice either PARTY's right to obtain performance of
         any obligation provided for in this AGREEMENT that survives
         termination of this AGREEMENT. Any such amount owed to a party shall
         be paid within thirty (30) days of the termination of this AGREEMENT.
         For the avoidance of doubt, DISTRIBUTOR is not required to make any
         loan that is not due to be made under Section 9.1(a) as of the
         effective date of termination. The provisions of Sections 3.8, 6.12,
         12.4, 13.3, 13.4, 13.5(c), 13.10(a), 14.1, 14.2, 15, 18.3, 18.4, 18.5,
         18.6, 18.7, and 19 and any other provisions, which by their intent are
         meant to survive termination of this AGREEMENT, shall survive the
         termination of this AGREEMENT for the longest period permitted by
         applicable law.

18.8     TERMINATION BY DISTRIBUTOR WITHOUT CAUSE.

         At any time after five (5) years after the Effective Date, DISTRIBUTOR
         shall have the right to terminate this AGREEMENT in the entirety or
         its distribution rights with respect to PRODUCT in the PROFIT-SHARING
         TERRITORY or in all countries of the OTHER TERRITORY by eighteen (18)
         months' prior written notice to L&I. For avoidance of doubt the
         PARTIES state that the earliest point at which DISTRIBUTOR



                                      56
<PAGE>   57
         may terminate this AGREEMENT pursuant to this Section 18.8 is by a
         termination notice delivered to L&I forty-two months following the
         Effective Date, terminating this AGREEMENT as of the fifth (5th)
         anniversary of the Effective Date.

19.      MISCELLANEOUS PROVISIONS

19.1     CHOICE OF LAW; VENUE.

         This AGREEMENT shall be governed by and construed in accordance with
         the laws of the State of Delaware without giving effect to its
         conflict of law rules and regulations. Any legal action arising under
         this AGREEMENT shall be brought in the United States District Court
         located in Delaware. DISTRIBUTOR and L&I hereby submit and consent to
         jurisdiction in the State of Delaware and hereby consent to venue in
         such court.

19.2     INTEGRATION;  AMENDMENT.

         This AGREEMENT and appendices referred to herein and the agreement of
         Appendix J set forth the entire agreement and understanding between
         the PARTIES as to the subject matter thereof and supersedes all prior
         agreements in this respect. There shall be no amendments or
         modifications to this AGREEMENT, except by a written document which is
         signed by both PARTIES.

19.3     HEADINGS.

         The headings in this AGREEMENT have been inserted for the convenience
         of reference only and are not intended to limit or expand on the
         meaning of the language contained in the particular article or
         section.

19.4     WAIVER.

         Any delay in enforcing a party's rights under this AGREEMENT or any
         waiver as to a particular default or other matter shall not constitute
         a waiver of a party's right to the future enforcement of its rights
         under this AGREEMENT, excepting only as to an expressed written and
         signed waiver as to a particular matter for a particular period of
         time.

19.5     INVALIDITY.

         In the event any provision of this AGREEMENT should be held invalid,
         illegal or unenforceable, the remaining provisions shall not be
         affected or impaired and the PARTIES will use all reasonable efforts
         to replace the applicable provision with a valid, legal and
         enforceable provision which insofar as practical implements the
         purposes hereof, provided, however, that if the PARTIES fail to reach
         such agreement within sixty (60) days, a PARTY whose rights or
         obligations are materially affected as a result of a provision being
         held invalid, illegal or unenforceable may terminate this AGREEMENT.



                                      57
<PAGE>   58

19.6     ARBITRATION.

         In the event the PARTIES are unable to reach agreement with respect to
         any matter which is to be subject to arbitration in accordance with
         Section 6.8(b), 6.13, 12.1(c)(iii)(I), 13.6 or 13.7, such will be
         determined through binding arbitration in accordance with the
         Commercial Rules of Arbitration of the American Arbitration
         Association. The site of the arbitration shall be New York, New York.

         The arbitration panel shall be comprised of three (3) arbitrators.
         Each PARTY shall be entitled to appoint one arbitrator. The PARTIES
         shall appoint their respective arbitrators within thirty (30) days
         after submission for arbitration. If either PARTY shall fail to make
         timely appointment of its arbitrator, the arbitration shall be heard
         and decided by the sole arbitrator duly appointed by the other PARTY.
         Where both PARTIES have timely appointed their respective arbitrators,
         the two arbitrators so appointed shall agree on the appointment of the
         third arbitrator from the list of arbitrators maintained by the
         American Arbitration Association. If the PARTIES' appointed
         arbitrators shall fail to agree within thirty (30) days from the date
         both PARTIES' arbitrators have been appointed, on the identity of the
         third arbitrator, then such arbitrator shall be appointed by the
         appropriate administrative body of the American Arbitration
         Association.

         Within ten (10) days of appointment of the full arbitration panel, the
         PARTIES shall exchange their final proposed positions with respect to
         the matters to be arbitrated, which shall approximate as closely as
         possible the closest positions of the PARTIES previously taken in the
         negotiations. Within thirty (30) days of appointment of the
         arbitration Panel, each PARTY shall submit to the arbitrators a copy
         of the proposed position which it previously delivered to the other
         PARTY, together with a brief or other written memorandum supporting
         the merits of its proposed position. The arbitration panel shall
         promptly convene a hearing, at which time each PARTY shall have one
         (1) hour to argue in support of its proposed position. The PARTIES
         will not call any witnesses in support of their arguments.

         The arbitration panel shall select either of the PARTY's proposed
         position on the issue as the binding final decision to be embodied as
         an agreement between the PARTIES. In making their selection, the
         arbitrators shall not modify the terms or conditions of either PARTY's
         proposed position; nor will the arbitrators combine provisions from
         both proposed position. In making their selection, the arbitrators
         shall consider the terms and conditions of this AGREEMENT, the
         relative merits of the proposed position and the written and oral
         arguments of the PARTIES. In the event the arbitrators seek the
         guidance of the law of any jurisdiction, the law of the State of
         Delaware shall govern.

         The arbitrators shall make their decision known to the PARTIES as
         quickly as possible by delivering written notice of their decision to
         both PARTIES. Such written notice need not justify their decision. The
         PARTIES will execute any and all papers necessary to obligate the
         PARTIES to the position selected by the arbitration Panel within five
         (5) days of receipt of notice of such selection. The decision of the
         arbitrators shall be final



                                      58
<PAGE>   59

         and binding on the PARTIES, and specific performance may be ordered by
         any court of competent jurisdiction.

         The PARTIES will bear their own costs in preparing for the
         arbitration. The costs of the arbitrators will be equally divided
         between the PARTIES.

20.      FORCE MAJEURE

20.1     Neither party shall be liable to the other for any default hereunder,
         which is not a payment default, which is due to cause beyond the
         control of the party in default, including but not limited to the
         actions or inactions of any government agency or instrumentality;
         breakdown of plant or machinery or shortages of labor, fuel,
         transportation of materials, fires, floods, earthquakes, war, riots or
         instructions. If either party shall seek to rely on Force Majeure it
         shall give written notice to the other indicating the details of the
         act which it claims has put due performance of its obligations beyond
         its control. In addition, the affected party shall exert all
         reasonable efforts to eliminate or cure any Force Majeure event and to
         resume performance with all possible speed. In the event this cannot
         be done within six (6) months, the parties shall either resolve the
         matter by mutual agreement or terminate this AGREEMENT. Each PARTY
         shall retain its legal remedies notwithstanding the operation of this
         Section.

21.      SUCCESSORS

21.1     Subject to Section 22, the rights and obligations included in this
         AGREEMENT shall be binding upon the parties hereto and their
         successors and assigns.

22.      ASSIGNMENT

22.1     This AGREEMENT may not be assigned by either PARTY without the written
         consent of the other PARTY, provided, however, that either PARTY shall
         have the right to assign this AGREEMENT in connection with the sale or
         transfer of all or substantially all of its assets or in the
         connection with a merger or consolidation or similar transaction, and
         further, with respect to L&I a transfer of its assets to one or more
         of its partners or a sale of the partnership.

23.      NOTICES

23.1     Any notice to be given under this AGREEMENT shall be effective when
         received at the address set forth below by registered or certified
         mail or an express delivery service. Notices shall be delivered to the
         respective PARTIES at the addresses set forth below:

         To L&I:  L&I Partners, L.P.
                  c/o ILEX Oncology, Inc.
                  11550 IH-10 West, Suite 100
                  San Antonio, TX  78230



                                      59
<PAGE>   60

                                    and

                           L&I Partners, L.P.
                           c/o Leukosite, Inc.
                           215 First Street
                           Cambridge, MA  02142

         Copy to: Carella, Byrne, Bain, Gilfillan,
                           Cecchi, Stewart & Olstein
                           6 Becker Farm Road
                           Roseland, New Jersey 07068
                           Fax: (973) 994-1744
                           ATTN: Elliot M. Olstein, Esq.

         To SCHERING:
                              Schering Aktiengesellschaft
                              13342 Berlin
                              Germany
                              Attention: Head of Oncology SBU

                  Copy to:
                              Schering Aktiengesellschaft
                              13342 Berlin
                              Germany
                              Attention:  Legal Department


Each PARTY shall have the right to designate a separate address for receipt of
purchase orders, forecasts, acknowledgements, invoices and other routine
correspondence relating to supply of PRODUCT.



24.      LIMITATION ON COMMITTEE ACTIVITY.

         Notwithstanding the creation of the DEVELOPMENT COMMITTEE or MARKETING
COMMITTEE, or any subcommittees thereof, each PARTY to this AGREEMENT shall
retain the rights, powers, and discretion granted to it hereunder, and neither
the DEVELOPMENT COMMITTEE, MARKETING COMMITTEE, nor any subcommittees thereof
shall be delegated or vested with any such rights, powers, or discretion unless
such delegation or vesting is expressly provided for herein or the PARTIES
expressly so agree in writing. Neither the DEVELOPMENT COMMITTEE, MARKETING
COMMITTEE, nor any subcommittee shall have the power to amend or modify this
AGREEMENT which may be amended or modified only as provided in Section 19.2.



                                      60
<PAGE>   61

25.      AMBIGUITIES.

         Ambiguities, if any, in this AGREEMENT shall not be construed against
either PARTY, irrespective of which PARTY may be deemed to have authored the
ambiguous provision.




                                      61
<PAGE>   62



         IN WITNESS WHEREOF, the parties hereto have caused this AGREEMENT to
be executed by their respective representatives hereunto duly authorized as of
the day and year first above-written.

SCHERING, A.G.                           L&I PARTNERS, L.P.


By:                                      By:
   -------------------------                --------------------------
Name:                                    Name:
     -----------------------                  ------------------------
Title:                                   Title:
      ----------------------                   -----------------------


By:
   -------------------------

Name:
     -----------------------

Title:
      ----------------------




                                      62
<PAGE>   63


                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                         PAGE
 <S>         <C>                                                         <C>
 1.          DEFINITIONS..................................................1

 2.          APPOINTMENT..................................................9

    2.1      Grant of Distribution Rights.................................9

    2.2      Limitation on Discounting....................................9

    2.3      Sales Through SUBDISTRIBUTORS................................9

 3.          MARKETING IN THE PROFIT-SHARING TERRITORY...................10

    3.1      Marketing Committee.........................................10

    3.2      Marketing Effort of DISTRIBUTOR.............................11

    3.3      Earnings Reports............................................12

    3.4      QUARTERLY Payment of APPROPRIATE PERCENTAGE.................13

    3.5      YEARLY Payment of APPROPRIATE PERCENTAGE....................13

    3.6      Credit Toward Loan Balance..................................14

    3.7      Payment in Lieu of EARNINGS.................................14

    3.8      Recordkeeping by DISTRIBUTOR................................14

    3.9      Co-Promotion................................................15

    3.10     Payment of Insurance Premiums...............................15

 4.          MARKETING IN THE OTHER TERRITORY............................16

    4.1      Sales Forecast..............................................16

    4.2      Marketing Efforts...........................................16

 5.          ORPHAN DRUG EXCLUSIVITY.....................................17

 6.          PURCHASE OF PRODUCTS........................................17

    6.1      Purchase and Sale Requirements..............................17

    6.2      Certain Packaging and Labeling by DISTRIBUTOR...............19

    6.3      Priority in Supply..........................................19

    6.4      Title, Risk.................................................20

    6.5      Superiority of AGREEMENT....................................20

    6.6      Price for PROFIT-SHARING TERRITORY..........................20

    6.7      Price for OTHER TERRITORY...................................21

    6.8      THIRD PARTY Royalties.......................................22

    6.9      Payment for PRODUCT.........................................23
</TABLE>


                                       i
<PAGE>   64

<TABLE>
<S>  <C>                                                                 <C>
     6.10     Delivery of Accounting.....................................23

     6.11     Currency Conversion........................................25

     6.12     Recordkeeping by DISTRIBUTOR...............................25

     6.13     Manufacturer other than BI.................................25

     6.14     Alternate Forecasting/Ordering Procedures..................27

 7.           PAYMENT....................................................27

              BI Agreement...............................................27

     8.1      Activities Under BI AGREEMENT..............................28

     8.2      Forecasts; Orders; Warranties..............................28

 9.           LOAN.......................................................30

 10.          DEVELOPMENT COMMITTEE......................................31

 11.          DEVELOPMENT FOR CLL INDICATIONS............................32

 12.          DEVELOPMENT FOR OTHER INDICATIONS..........................34

    12.2      Loan Reductions............................................38

    12.3.     Further Loan Reductions....................................38

    12.4      DISTRIBUTOR Audit Rights...................................38

 13.          OTHER RESPONSIBILITIES.....................................39

    13.1      Compliance with Law........................................39

    13.2      Prohibition on Exports.....................................39

    13.3      Negation of Partnership; Etc...............................39

    13.4      Confidentiality............................................39

    13.5      Appointment of Authorized Agent............................41

    13.6      Exclusivity Protection For DISTRIBUTOR.....................42

    13.7     Exclusivity Protection For L&I..............................44

    13.8     Ownership of Regulatory Licenses............................44

    13.9     AFFILIATES and SUBDISTRIBUTORS..............................44

    13.10    Reports.....................................................45

    13.11    Patent Markings.............................................45

    13.12    Preclinical and Clinical Data...............................46

    13.13    Infringement by Third Parties...............................46

    13.14    Infringement of Third Party Rights..........................46

    13.15    Superiority of Indemnity Provisions.........................47

    13.16    Coordination of Inspection Rights...........................47
</TABLE>



                                      ii
<PAGE>   65

<TABLE>
<S>      <C>                                                                <C>
14.      TRADEMARK AND TRADE DRESS..........................................47

15.      INDEMNITY..........................................................48

         15.1     Indemnification by Distributor for Negligence,
                  Willful Misconduct, or Breach.............................48

         15.2     Indemnification by L&I for Negligence, Willful
                  Misconduct, or Breach.....................................48

         15.3     General Indemnification by DISTRIBUTOR ...................48

         15.4     General indemnification by L&I........................... 49

         15.5     Conditions to Indemnification.............................49

         15.6     Insurance.................................................50

16.      ADVERSE REACTIONS; COMPLAINTS......................................50

         16.1     Preparation of Standard Operating Procedure...............50

         16.2     Agency Action.............................................50

         16.3     Recalls...................................................51

17.      WARRANTIES.........................................................51

         17.1     Mutual Warranty...........................................51

         17.2     L&I Warranties............................................52

         17.3     Negation of other Representations and Warranties..........53

         17.4     Third Party Licenses......................................53

         17.5     DISTRIBUTOR Payments Under BTG AGREEMENT..................53

18.      TERM AND TERMINATION...............................................54

         18.1     Term......................................................54

         18.2     Agreement Termination.....................................54

         18.3     Use of PRODUCT after Termination..........................54

         18.4     No Loan Repayment.........................................55

         18.5     Repurchase of Certain Product.............................55

         18.6     Termination of BTG AGREEMENT..............................55

         18.7     Effect on Outstanding Obligations.........................56

         18.8     Termination by DISTRIBUTOR Without Cause..................56

19.      MISCELLANEOUS PROVISIONS...........................................57

         19.1     Choice of Law; Venue......................................57

         19.2     Integration; Amendment....................................57

         19.3     Headings..................................................57

         19.4     Waiver....................................................57
</TABLE>


                                      iii
<PAGE>   66

<TABLE>
<S>      <C>                                                               <C>
         19.5     Invalidity................................................57

         19.6     Arbitration...............................................58

20.      FORCE MAJEURE......................................................59

21.      SUCCESSORS.........................................................59

22.      ASSIGNMENT.........................................................59

23.      NOTICES............................................................59

24.      LIMITATION ON COMMITTEE ACTIVITY...................................60

25.      AMBIGUITIES........................................................61
</TABLE>

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