COULTER PHARMACEUTICALS INC
8-K, 1997-09-29
PHARMACEUTICAL PREPARATIONS
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<PAGE>   1


                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D. C. 20549

                                    FORM 8-K

                                 CURRENT REPORT


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


      Date of Report (Date of earliest event reported): September 26, 1997



                          COULTER PHARMACEUTICAL, INC.
             (Exact name of registrant as specified in its charter)


                                    DELAWARE
                 (State or other jurisdiction of incorporation)


                 000-21905                               94-3219075
          (Commission File No.)              (IRS Employer Identifications No.)
        
       


                        550 CALIFORNIA AVENUE, SUITE 200
                            PALO ALTO, CA 94306-1440
              (Address of principal executive offices and zip code)



       Registrant's telephone number, including area code: (415) 842-7300






<PAGE>   2
Item 5.  Other Events.

        Coulter Pharmaceutical, Inc. (the "Company") and Lonza Biologies PLC
("Lonza") entered into the Third Amendment to the Manufacturing Agreement, dated
September 26, 1997 (the "Third Amendment"), and the Fourth Amendment to the
Manufacturing Agreement, dated September 17, 1997 (the "Fourth Amendment").  The
Third Amendment and the Fourth Amendment are part of a series of amendments to
the original Manufacturing Agreement between the Company and Lonza, dated August
20, 1996. The Company had contracted with Lonza as a third-party manufacturer to
produce unlabeled B-1 Antibody for use in clinical trials of the Company's most
advanced product candidate Bexxar (formerly known as the "B-1 Therapopy").




                                       1.
<PAGE>   3

Item 7.        Exhibits.

               10.13*         Third Amendment to Manufacturing Agreement, dated
                              September 26, 1997, by and between Lonza Biologies
                              PLC and the Registrant.

               10.14*         Fourth Amendment to Manufacturing Agreement, dated
                              September 17, 1997, by and between Lonza Biologies
                              PLC and the Registrant.

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

* Portions omitted pursuant to a request of confidentiality filed separately
  with the Commission.


                                       4.
<PAGE>   4

                                   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.


                                        COULTER PHARMACEUTICAL, INC.


Dated:  September 26, 1997
                                        By: /s/ WILLIAM G. HARRIS
                                           ----------------------------------
                                           William G. Harris
                                           Vice President and
                                           Chief Financial Officer






















                                       5.
<PAGE>   5

                               INDEX TO EXHIBITS
                               -----------------

              10.13*         Third Amendment to Manufacturing Agreement, dated
                             September 26, 1997, by and between Lonza Biologies
                             PLC and the Registrant.

              10.14*         Fourth Amendment to Manufacturing Agreement, dated
                             September 17, 1997, by and between Lonza Biologies
                             PLC and the Registrant.

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

* Portions omitted pursuant to a request of confidentiality filed separately
  with the Commission.

<PAGE>   1
THIS THIRD AMENDMENT is made the twenty-sixth day of September 1997 to an
Agreement dated 20 August 1996, by agreement between the parties (the
"Agreement")

BETWEEN

COULTER PHARMACEUTICAL INC. of 550, California Avenue, Suite 200, Palo Alto, CA
94306, USA ("the Customer")

AND

LONZA BIOLOGICS PLC of 228 Bath Road, Slough, Berkshire, SL1 4DY, England
("Lonza").

WHEREAS:

A.      The parties entered into the Agreement pursuant to which Lonza agreed to
        provide Services to the Customer to develop a Process for production of
        Product which agreement has been previously amended; and

B.      Customer now wishes Lonza to perform certain additional Services in
        association with the above mentioned development and manufacture of
        Product; and

C.      Lonza is prepared to provide such additional Services on the terms and
        conditions set out herein.

NOW THEREFORE it is hereby agreed to amend the terms of the Agreement as
follows:

1.      Stages 16, 17b and 18 of the Services are to be performed in accordance
        with the provisions of separate amendments to the Agreement.


[*]  Confidential treatment requested pursuant to a request for confidential
     treatment filed with the Securities and Exchange Commission. Omitted
     portions have been filed separately with the Commission.

<PAGE>   2
2.      A new Stage 19 shall be added to Schedule 2 as follows:

        "Stage 19 - Preparation of a Biologics License Application (BLA) to
        Support the Customer's Regulatory Filing to the US FDA for the Product.

        19.1    Objectives

                19.1.1  To prepare for submission to the US FDA Lonza's License
                        Application (BLA) for bulk purified Product. 

                19.1.2  To answer questions that the US FDA might have on the
                        BLA submitted by Lonza.

                19.1.3  To host a pre-licensing inspection of Lonza's facility
                        by the US FDA with reference to the manufacture and
                        testing of bulk purified Product. Up to six employee
                        representatives of the Customer shall be entitled to be
                        present at Lonza's premises (but not directly involved
                        in the inspection) during the period of the inspection
                        and may, at Lonza's request, attend to participate in
                        the inspection.

                        Lonza agrees to report to the Customer on the progress
                        of the inspection at appropriate points during its 
                        conduct.

        19.2    Activities

                19.2.1  Assemble the reports and provide data to the Customer as
                        appropriate for all the studies carried out at Lonza
                        under this Agreement to validate the Product and
                        Process.

                19.2.2  Prepare the BLA for the Product including the reports
                        assembled under activity 19.2.1 above, and all necessary
                        Product and Process information.



[*]  Confidential treatment requested pursuant to a request for confidential
     treatment filed with the Securities and Exchange Commission. Omitted
     portions have been filed separately with the Commission.
<PAGE>   3
                        The BLA will be prepared based on the draft BLA Working
                        Check List in Appendix 1. Details of the information to
                        be supplied under each heading, page numbers, and the
                        content, format and mode of submission of the
                        information to the US FDA will be agreed between Lonza
                        and Customer.


        19.2.3  If requested by the Customer provide Lonza personnel to attend
                up to two pre-submission meetings with the FDA in the US and
                prepare appropriate briefing documents for these meetings,
                containing some but not all of the information detailed in the
                Working Checklist to be agreed under 19.2.2.


        19.2.4  Forward the BLA in appropriate sections to the Customer for
                review before filing with the US FDA. Customer agrees wherever
                possible to review and comment upon the draft BLA within five
                working days of its receipt from Lonza. Customer acknowledges
                that any delay in conducting such review will result in a delay
                to completion of this Stage 19 of the Services. For the
                avoidance of doubt the document forwarded to Customer will not
                contain information which is proprietary to Lonza or is a
                subject to obligations of confidence to third parties.

        19.2.5  Revise the BLA as requested by the Customer if the revisions are
                agreed between the parties. When requested by the Customer
                submit the BLA to the US FDA.

        19.2.6  Inform Customer of questions raised which specifically relate to
                Product. Respond to any questions from the US FDA with relation
                to the BLA.

        19.2.7  If requested by the US FDA and/or Customer host a pre-licensing
                inspection at Lonza with respect to the Product and the BLA.



[*]  Confidential treatment requested pursuant to a request for confidential
     treatment filed with the Securities and Exchange Commission. Omitted
     portions have been filed separately with the Commission.
<PAGE>   4
  
                19.2.8  Inform Customer of questions raised which specifically
                        relate to Product. Prepare responses to any requests for
                        further information resulting from the US FDA inspection
                        of Lonza's facility.

        19.3.   Timescale

                Stage 19 shall be complete when Lonza have responded to all US
                FDA questions relating to the Product and the BLA to the
                satisfaction of the US FDA.

                It is estimated that activities 19.2.1 to 19.2.4 shall be
                complete seven months from commencement of Stage 19. Timing of
                subsequent activities is dependent on the Customer and the US
                FDA and can not be estimated by Lonza. Lonza agrees to provide
                responses to questions from the US FDA, received under
                activities 19.2.6 and 19.2.8, in a reasonable time frame. An
                initial or, if practicable, a full response to such questions
                shall be provided by Lonza within thirty days of Lonza receiving
                the same."

3.      A new Stage 20 shall be added to Schedule 2 as follows:

        "Stage 20 - Manufacture of [*] cGMP Batches of Product

        20.1    Objectives

                Manufacture [*] batches of Product at [*] scale in accordance
                with the principles of GMP for delivery to Customer.

        20.2    Activities

                20.2.1  Recover one vial of the Cell Line from the WCB and
                        expand culture to inoculate a [*] fermenter.



[*]  Confidential treatment requested pursuant to a request for confidential
     treatment filed with the Securities and Exchange Commission. Omitted
     portions have been filed separately with the Commission.
<PAGE>   5

                20.2.2  Carry out airlift fermentation at [*] scale.

                20.2.3  Clarify, harvest and concentrate supernatant.

                20.2.4  Purify Product from the concentrate.

                20.2.5  Test Product against Specification.

                20.2.6  Undertake Quality Assurance review of lot documentation.

                20.2.7  Issue lot release for Product internally.

                20.2.8  Issue certificate of analysis and consolidated Customer
                        batch record to Customer.

                20.2.9  Delivery Product to Customer.

                20.2.10 Repeat activities 20.2.1 to 20.2.9 (inclusive) [*]
                        further times.

        20.3    Timescale

                Stage 20 shall be complete upon delivery of the [*] batch of
                Product to the Customer. It is estimated that the first [*]
                batches will be delivered during the fourth quarter of 1998. It
                is estimated that the [*] batch of Product will also be
                delivered during the fourth quarter of 1998 but may, at
                Customer's written request, to be received by Biologics no later
                than 31 March 1998, be delayed for delivery no later than 31
                March 1999".


[*]  Confidential treatment requested pursuant to a request for confidential
     treatment filed with the Securities and Exchange Commission. Omitted
     portions have been filed separately with the Commission.

<PAGE>   6
4.      The following shall be added to Clauses 1 and 2 of Schedule 3:

"1.     Price

        In consideration for Lonza carrying out the Services as detailed in
        Schedule 2 (Stages and 20) the Customer shall pay Lonza as follows:
        
        Stage 19 Preparation of a Biologic License Application (BLA) to support
        the Customer's Regulatory Filing to the US FDA of the Product.
        
        Activities 19.2.1 to 19.2.4:                     [*]

        Activities 19.2.5 to 19.2.8:         [*] per man day*

        *[*] per man day for services performed in 1998. Thereafter the price
        per man day shall be revised in accordance with Lonza's standard man day
        rates applying at the time in question.

        For the purpose of calculating the Price for activities 19.2.5 to 19.2.8
        Lonza will not charge for any Lonza man days that might be required to
        conform with requests by the Customer (under activity 19.2.5) or the FDA
        (under activities 19.2.6 or 19.2.8) to add to the BLA submitted to the
        Customer or to the FDA because of omissions by Lonza of items listed
        under the Working Check List as set out in Appendix 1. Lonza will only
        charge for man days required to perform work additional to that set out
        under activities 19.2.1 to 19.2.4. If, as a result of the pre-licensing
        inspection outlined in activity 19.2.7, Lonza receives a 483 or any
        other deficiency notification from the FDA, the Customer will not pay
        for time spent responding to such 483s or other deficiency notifications
        unless these are received as a result of Customer direction or
        information provided by the Customer.

        Stage 20 Supply of Product at [*] Scale      not to exceed [*]
        per batch




[*]  Confidential treatment requested pursuant to a request for confidential
     treatment filed with the Securities and Exchange Commission. Omitted
     portions have been filed separately with the Commission.
<PAGE>   7
2.      Payment

        2.1     For Stage 19 activities 19.2.1 to 19.2.4

                [*] upon commencement of activity 19.2.1
                [*] upon completion of activities 19.2.1 to 19.2.4

        2.2     For Stage 19 activities 19.2.5 to 19.2.8

                Lonza will present invoices to the Customer at the end of each
                calendar quarter itemising work done at Lonza that quarter and
                man days to be charged under activities 19.2.5 to 19.2.8.

                Lonza will provide the Customer with an estimate at the
                beginning of each calendar quarter of the man days that will be
                incurred in carrying out work under activities 19.2.5 to 19.2.8.
                The Customer shall approve this estimate of the work in any
                calendar quarter before the work commences. Any significant
                variance in the estimated work for a calendar quarter shall be
                approved by the Customer prior to commencement of the work.

        2.3     For Stage 20

                100% (not to exceed [*] per batch) upon delivery of the batch
                of Product in question".

5.      a.      Save as provided below, Customer acknowledges and hereby agrees
                that, on signature of this Amendment to the Agreement, Customer
                has made a binding and irrevocable commitment to accept and pay
                for the supply of the Services set out in sections 2 and 3 of
                this Amendment (above).

[*] Confidential treatment requested pursuant to a request for confidential
    treatment filed with the Securities and Exchange Commission. Omitted
    portions have been filed separately with the Commission.
<PAGE>   8

        b.      In the event Lonza fails to perform stage 19.2.1 to stage 19.2.4
                of the Services in a diligent manner, Customer shall be entitled
                to request that performance of stage 20 of the Services be
                delayed by a period equivalent to the delay which has been
                caused in completing stage 19.2.4 due solely to Lonza's lack of
                diligence.

        c.      Customer expressly agrees that in order to enable Lonza to
                perform Stage 19 of the Services Customer must agree to purchase
                additional DNA clearance services and assay validation services.
                Customer further agrees that its obligations to purchase the
                Services set out in Stage 20 will not in any way be diminished
                by failure to formalise an amendment to the Agreement for supply
                of such Services.

8.      The parties are currently negotiating a form of quality statement
        relating to those stages of the Services which are to be performed in
        accordance with the principles of GMP and which statement may, if
        required, be supplied to relevant regulatory authorities.

        The parties agree to use all reasonable endeavours to finalise the above
        mentioned quality statement by 31 December 1997.

9.      Following signature of this amendment the parties agree to use all
        reasonable endeavours to negotiate a long term supply agreement for the
        manufacture of Product by Lonza. It is intended that such agreement
        shall be finalised by 31 December 1997, and supply of Product under its
        terms shall be in addition to the Services provided hereunder. If
        concluded, such agreement with included, but not limited to the
        following provisions:

        a.      Customer shall commit to purchase from Lonza at least [*]
                batches of Product produced in accordance with the principles of
                GMP, in each calendar year during which the said supply
                agreement subsists Lonza may be requested to supply up to [*]
                batches in each year. Lonza shall agree to 



[*]  Confidential treatment requested pursuant to a request for confidential
     treatment filed with the Securities and Exchange Commission. Omitted
     portions have been filed separately with the Commission.
<PAGE>   9

                use reasonable commercial endeavours to supply such additional
                batches if requested; and

        b.      Lonza shall be entitled to allow the BLA prepared pursuant to
                stage 19 of the Services to lapse in the event Customer fails to
                abide by the above mentioned minimum purchase requirements; and

        c.      the price for Product supplied to customer pursuant to the above
                mentioned supply agreement will initially be charged per batch
                of Product. It is the intention that, following supply of at
                least [*] batches of Product under the supply agreement the
                Product will be supplied on a "per gram" basis. The initial
                price of Product per gram will be determined by the average
                yield of at least [*] consecutive batches of Product purchased
                under the supply agreement.

                A mechanism for increasing the price of Product to account for
                inflation and other increases in the cost of supplying Product
                and/or the costs of maintaining the BLA will be negotiated; and

        d.      the parties shall agree to review options to reduce the price of
                producing Product by cost saving initiatives and to agree a
                mechanism by which the benefit of such initiatives can be shared
                between the parties.
 
10.     Save as expressly provided herein, the terms and conditions of the
        Agreement shall remain in full force and effect.


[*] Confidential treatment requested pursuant to a request for confidential
    treatment filed with the Securities and Exchange Commission. Omitted
    portions have been filed separately with the Commission.

<PAGE>   10

AS WITNESS the hands of the duly authorised representatives of the parties
hereto the day and year first above written.


Signed for and on behalf of                    /s/ Simon Sturge 
                                        -----------------------------------

LONZA BIOLOGICS PLC                                  CEO 
                                        -----------------------------------
                                         



Signed for and on behalf of                  /s/ William G. Harris         
                                        -----------------------------------
                                        

COULTER PHARMACEUTICAL INC                  Vice President and CFO 
                                        -----------------------------------
                                        


*   Confidential treatment requested pursuant to a request for confidential
    treatment filed with the Securities and Exchange Commission. Omitted
    portions have been filed separately with the Commission.





<PAGE>   11
                                      -11-

                                   APPENDIX 1

                         Biologics License Application


                               Working Check List




                                      





















[*] Confidential treatment requested pursuant to a request for confidential
    treatment filed with the Securities and Exchange Commission. Omitted
    portions have been filed separately with the Commission.


<PAGE>   12
<TABLE>

                                                                                                           Project Filing Date: 4/98

                                                       BLA WORKING CHECKLIST
<CAPTION>
====================================================================================================================================
FDA Item                Title                          Authors   Deliverable           Publication                    Comments
  No.                                                                                     Format
                                                                ------------------------------------------
                                                                Due In  Rec'd  TOC Rules Scan Tables Other  
====================================================================================================================================
<S>        <C>                                                  <C>     <C>    <C> <C>   <C>   <C>   <C>    <C>

           COVER LETTER
           FORM 3439 (or 3561)
           LETTER OF AUTHORIZATION
1          INDEX (TOC)                                                          X
2          LABELING                                                                                         Printed draft or final
                                                                                                            package insert, vial
                                                                                                            label and carton.
3          OVERALL SUMMARY                             Heading                  X            
3.1        Annotated Package Insert                    Heading
3.2        Summary                                     Heading
3.2.1      Pharmacologic Class, Scientific
           Rationale, Intended Use, and
           Potential Clinical Benefit
3.2.2      Foreign Marketing History
3.2.3      Chemistry, Manufacturing and Control
           Summary
3.2.4      Nonclinical Pharmacology and
           Toxicology Summary
3.2.5      Human Pharmacokinetics and
           Bioavailability
3.2.6      Clinical Data Summary and                   Heading                  X
           Results of Statistical Analysis 
3.2.6.1    Clinical Pharmacology
3.2.6.2    Overview
3.2.6.3    Controlled Clinical Trials
3.2.6.4    Uncontrolled Clinical Trials
3.2.6.5    Other Studies
3.2.6.6    Safety Summary - General Safety
           Information
3.2.7      Discussion of Benefit/Risk Relationship     Heading 
4          CHEMISTRY SECTION                           Heading                  X
4.1        Chemistry, Manufacturing, and               Heading                  X
           Control Information
4.1.1      Introduction/Manufacturing History
4.1.2      Drug Substance (Lonza)                      Heading                  X
4.1.2.1    Description and Characterization            Heading                  X
4.1.2.1.1  Description    
4.1.2.1.2  Characterization/Proof of Structure
             Physicochemical Characterization of
             Reference Standard and Qualifying Lots
- ------------------------------------------------------------------------------------------------------------------------------------

</TABLE>
<PAGE>   13
<TABLE>

                                                                                                           Project Filing Date: 4/98

                                                       BLA WORKING CHECKLIST
<CAPTION>
====================================================================================================================================
FDA Item                 Title                          Authors   Deliverable           Publication                    Comments
  No.                                                                                     Format
                                                                 ------------------------------------------
                                                                 Due In  Rec'd  TOC Rules Scan Tables Other  
====================================================================================================================================
<S>        <C>                                                  <C>     <C>    <C> <C>   <C>   <C>   <C>    <C>

            Biological Activity
4.1.2.2     Manufacturer(s)                             Heading                  X
4.1.2.2.1   Identification
4.1.2.2.2   Floor Diagrams
4.1.2.2.3   Other Products
4.1.2.2.4   Contamination Precautions
4.1.2.3     Method(s) of Manufacture                    Heading                  X
4.1.2.3.1   Raw Materials and Reagents
4.1.2.3.2   Flow Charts of the Manufacuring
            Process
4.1.2.3.3   Detailed Description-Cellular Sub-          Heading                  X
            strate/Host Cell/Expression/Vector
            System
4.1.2.3.4   Cell Seed Lot System                        Heading                  
4.1.2.3.4.1 Master Cell Bank
4.1.2.3.4.2 Working Cell Bank
4.1.2.3.4.3 End of Production Cells
4.1.2.3.5   Cell Growth and Harvesting
4.1.2.3.6   Purification and Downstream
            Processing
4.1.2.3.7   Batch Records                               Heading                  X
4.1.2.4     Process Controls                            Heading                  X
4.1.2.4.1   In-Process Controls
4.1.2.4.2   Process Validation                          Heading                  X
4.1.2.4.2.1 Validation for Studies for
            Cell Growth/Harvest
4.1.2.4.2.2 Validation for Purification
            Process
4.1.2.4.2.3 Microbiology
4.1.2.5     Reference Standards                         Heading                  X
4.1.2.6     Specifications/Analytical Methods           Heading                  X
4.1.2.6.1   Specifications and Analytical
            Methods
4.1.2.6.2   Certificates of Analysis and
            Analytical Results
4.1.2.6.3   Impurities Profile
4.1.2.7     Container/Closure                           Heading   
4.1.2.8     Drug Substance Stability                    Heading
4.1.2.9     References                                  Heading                                              Alphabetical for Drug
                                                                                                             Substance with copies
                                                                                                             appended
4.1.2.10    Methods Validation                          Heading                                              If not in Drug Product
                                                                                                             Section
4.1.3.3     Manufacturer                                Heading
4.1.3.3.1   Identification
- -----------------------------------------------------------------------------------------------------------------------------------

</TABLE>
<PAGE>   14
<TABLE>

                                                                                                           Project Filing Date: 4/98

                                                       BLA WORKING CHECKLIST
<CAPTION>
====================================================================================================================================
FDA Item                Title                          Authors   Deliverable           Publication                    Comments
  No.                                                                                     Format
                                                                ------------------------------------------
                                                                Due In  Rec'd  TOC Rules Scan Tables Other  
====================================================================================================================================
<S>        <C>                                                  <C>     <C>    <C> <C>   <C>   <C>   <C>    <C>

4.1.3.3.2  Floor Diagrams
4.1.3.3.3  Facility Systems
4.1.3.4    Methods of Manufacturing and                Heading
           Packaging
4.1.3.5    Specifications and Test Methods             Heading
           for Drug Product
4.1.3.5.1  Specifications and Test Methods
4.1.3.5.2  Certificates of Analysis
4.1.3.6    Container/Closure System                    Heading                  
4.1.3.7    Microbiology                                Heading                  X                           Aseptic Fill Conney
                                                                                                            Report
4.1.3.7.1  Building and Facilities
4.1.3.7.2  Critical Manufacturing Operations
4.1.3.7.3  Specifications for Hold Periods                                                                  will need for Europe
4.1.3.7.4  Drug Product Filtration Description-                                                             will need for Europe
           Microbial Retention/Filter 
           Compatibility
4.1.3.7.5  Sterilization and Depyrogenation of
           Containers, Closures, Equipment and
           Components
4.1.3.7.6  Procedures and Specifications for
           Media Fills
4.1.3.7.7  Actions for Media Fill Failures
4.1.3.7.8  Microbiological Monitoring of the
           Environment
4.1.3.7.9  Container/Closure and Packaging Integrity
4.1.3.7.10 Sterility Testing Methods and Release
           Criteria
4.1.3.7.11 Bacterial Endotoxins Test and Method
4.1.3.7.12 Evidence of Formal Written Procedures
4.1.3.8    Drug Product Stability                      Heading
4.1.3.9    Batch Record for Final Product              Heading
4.1.4      Investigational Product/Formulation         Heading
4.1.5      Environmental Assessment                    Heading
4.1.5.1    Date
4.1.5.2    Name of Applicant/Petitioner
4.1.5.3    Address
4.1.5.4    Description of Proposed Action
4.1.5.5    Identification of Chemical Substances
4.1.5.6    Introduction of Substances into the
           Environment
4.1.5.7    Fate of Emitted Substances in the
           Environment
4.1.5.8    Environmental Effects of Released 
           Substances
4.1.5.9    Use of Resources and Energy
- -----------------------------------------------------------------------------------------------------------------------------------

</TABLE>
<PAGE>   15
<TABLE>

                                                                                                           Project Filing Date: 4/98

                                                       BLA WORKING CHECKLIST
<CAPTION>
====================================================================================================================================
FDA Item                Title                          Authors   Deliverable           Publication                    Comments
  No.                                                                                     Format
                                                                ------------------------------------------
                                                                Due In  Rec'd  TOC Rules Scan Tables Other  
====================================================================================================================================
<S>        <C>                                                  <C>     <C>    <C> <C>   <C>   <C>   <C>    <C>

4.1.5.10   Mitigation Measures
4.1.5.11   Alternatives to the Proposed Action
4.1.5.12   List of Preparers
4.1.5.13   Certification
4.1.5.14   References
4.1.5.15   Appendices
4.1.6      Method Validation                           Heading 
4.1.7      References                                                                                       Alphabetical for Drug
                                                                                                            Product Section with
                                                                                                            copies appended
4.2        Samples                                                                                          If needed
- ------------------------------------------------------------------------------------------------------------------------------------

</TABLE>

<PAGE>   1
THIS FOURTH AMENDMENT is made the 17th day of September, 1997 to an Agreement
dated 20 August 1996, and amended 18th November 1996 and                  1997
("the Agreement")

BETWEEN

COULTER PHARMACEUTICAL INC. of 550, California Avenue, Suite 200, Palo Alto, CA
94306, USA ("the Customer")

AND

LONZA BIOLOGICS PLC of 228 Bath Road, Slough, Berkshire, SL1 4DY, England
("Lonza").

WHEREAS:

A.      The parties entered into the Agreement pursuant to which Lonza agreed to
        provide Services to the Customer to develop a Process for production of
        Product; and

B.      Customer now wishes Lonza to perform certain additional Services in
        association with the above mentioned development and manufacture of
        Product; and

C.      Lonza is prepared to provide such additional Services on the terms and
        conditions set out herein.

NOW THEREFORE it is hereby agreed to amend the terms of the Agreement as
follows:


[*] Confidential treatment requested pursuant to a request for confidential
    treatment filed with the Securities and Exchange Commission. Omitted
    portions have been filed separately with the Commission.

<PAGE>   2


1.      A new Stage 15 shall be added to Schedule 2 as follows:

    "Stage 15 - Validation of [*].

    15.1    Objectives

        15.1.1  To obtain [*] data for [*] model [*] across the Process used in
                the purification of bulk Product. The study will be designed to
                be included in a Biologics Licence Application.

        15.1.2  To review in the study report the appropriateness, or otherwise,
                of any of the Process steps as a [*] step.


    15.2    Activities

        15.2.1  Design a scaled-down process for the [*] steps. This will mimic
                as closely as possible the manufacturing scale Process. Agree a
                GMP study protocol with the Customer. Agree which Testing
                Laboratory to use with the Customer.

        15.2.2  Collect samples from a [*] scale manufacturing batch of Product.
                Samples will be collected at appropriate points prior to the [*]
                steps and the [*].

        15.2.3  Validate the scaled-down process for each of the [*] steps
                without a [*]. Compare the [*] profile, Product yield and
                purity with the full manufacturing Process.

        15.2.4  Repeat the scaled-down process for each of the [*] steps, each
                spiked separately with the [*] as agreed in the study protocol.
                The [*] will be prepared and assayed by personnel at the
                Testing Laboratory. The [*] experiments will be carried out by
                Lonza personnel in the Testing Laboratory's facility.

        15.2.5  Assay [*] recovered in Product-containing fractions (to allow
                calculation of [*]) and selected unbound and wash fractions to
                determine where possible where [*] is removed and hence
                identify critical steps in the Process.

        15.2.6  Evaluate the extent of [*] on [*].

        15.2.7  Evaluate the [*] effects of Process materials and/or
                interference with [*]. Evaluate the inactivation of selected [*]
                by the [*] for the [*] and the column regeneration conditions
                for the [*].

        15.2.8  Calculate [*] factors for each step by dividing total [*]
                applied to each [*] to that recovered with Product.

[*] Confidential treatment requested pursuant to a request for confidential
    treatment filed with the Securities and Exchange Commission. Omitted
    portions have been filed separately with the Commission.


<PAGE>   3
3

        15.2.9  Issue a final study report to the Customer, copies of data
                generated under Stage 15 if requested by the Customer and
                deviations and amendments to the protocol agreed under 15.2.1.
                Twice during the course of this Stage 15 if requested by the
                Customer (and more frequently if agreed between the parties) 
                Lonza will issue to the Customer unaudited interim data
                summaries provided such requests from the Customer are 
                reasonable in nature.

15.3    Timescale
                
        Stage 15 will be complete on issue of the final report under activity
        15.2.9. It is estimated that this final report will be issued [*] 
        from commencement of State 15."






















[*] Confidential treatment requested pursuant to a request for confidential
    treatment filed with the Securities and Exchange Commission. Omitted
    portions have been filed separately with the Commission.
<PAGE>   4


4


2.      The following shall be added to Clauses 1 and 2 of Schedule 3:

"1.     Price

        In consideration for Lonza carrying out the Services as detailed in
        Schedule 2 (Stage 15) the Customer shall pay Lonza as follows:

        Stage                                        Price (UK Sterling)
        -----                                        -------------------

        Stage 15 -- Evaluation of [*]                        [*]


(1)     The Price for this Stage does not include Testing Laboratory charges
which will be passed on directly to the Customer.

2.      Payment

        Payment by the Customer of the Price for Stage 15 shall be made against
        Lonza's invoices as follows:

        2.1     For Stage 15

                [*] upon commencement of Stage 15 
                [*] upon completion of Stage 15 
                Testing Laboratory charges will be
                invoiced to the Customer on completion of Stage 15."

        3.      Save as expressly provided herein, the terms and conditions of
                the Agreement shall remain in full force and effect.

AS WITNESS the hands of the duly authorized representatives of the parties
hereto the day and year first above written.


Signed for and on behalf of             /s/ SIMON STURGE
LONZA BIOLOGICS PLC                     ----------------------------------------
                                        CEO
                                        ----------------------------------------

Signed for and on behalf of             /s/ WILLIAM G. HARRIS
COULTER PHARMACEUTICAL INC.             ----------------------------------------
                                        Vice President and CFO
                                        ----------------------------------------



[*] Confidential treatment requested pursuant to a request for confidential
    treatment filed with the Securities and Exchange Commission. Omitted
    portions have been filed separately with the Commission.



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