Document:

<PAGE>

                                                                   EXHIBIT 10.23

CERTAIN MATERIAL (INDICATED BY AN ASTERISK) HAS BEEN OMITTED FROM THIS DOCUMENT
PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT. THE OMITTED MATERIAL HAS BEEN
FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.

                                    AGREEMENT

         This Agreement is made and is effective this 31st day of July, 2000,
(the "Effective Date") between Cancer Diagnostic Laboratories, Inc. ("CDL"), a
California corporation and CancerVax Corporation ("CancerVax"), a Delaware
corporation.

                                    RECITALS

         WHEREAS, pursuant to a Transfer Agreement dated May 22, 1997, between
CDL and The Regents of The University of California, attached hereto as Exhibit
1 (the "Transfer Agreement"), CDL has rights to certain Human Tumor Cell Lines,
as described in UCLA Case No. LA96-060-01.

         WHEREAS, pursuant to an assignment dated January 1, 1991, attached
hereto as Exhibit 2, CDL has been assigned the rights of Rishab K. Gupta in U.S.
Patent Application SN 431,533, including any divisionals, continuations,
continuations-in-part, foreign counterparts, any United States or foreign
patents issuing therefrom as well as any extensions or reissues thereof.

         WHEREAS, CancerVax wishes to commercialize the vaccine technology set
forth in the '533 patent application, to have full rights to utilize any
diagnostic technology necessary for the development, production and marketing of
the product, and to further investigate the characteristics and potential
commercial utility of the technology.

         The parties agree as follows:

                                 1. DEFINITIONS

         1.1      "CDL's Patent Rights" shall mean patent rights claimed in or
covered under U.S. patent application SN 431,533, filed November 3, 1989,
including any divisionals, continuations, continuations-in-part, foreign
counterparts, any United States or foreign patents issuing therefrom, as well as
any extensions, reexaminations or reissues thereof.

         1.2      "Cell Lines" shall mean the human tumor cell lines listed in
Appendix A hereto and any progeny or derivatives.

         1.3      "Field" shall mean the treatment or prevention of cancer in
humans through the use of products or methodologies that employ an
antigen-containing vaccine.

         1.4      "Licensed Products and Methods" shall mean any product,
composition, material or method whose manufacture, development, use, sale, offer
for sale or import by a party not licensed under CDL's Patent Rights would
constitute an infringement of any claim or claims of CDL's Patent Rights.

                                       1

<PAGE>

                                    2. GRANT

         2.1      Quitclaim of Cell Lines. CDL hereby irrevocably quitclaims its
entire right, title and interest in and to the Ceil Lines to CancerVax (the
"Transfer"), subject to the terms and conditions of the Transfer Agreement.

         2.2      John Wayne Cancer Institute. It is recognized and agreed that:
(i) the Cell Lines are subject to a nonexclusive license to the John Wayne
Cancer Institute, a California non-profit corporation ("JWCI"), pursuant to a
Cross-License Agreement dated July 24, 1998 (the "JWCI Agreement"); (ii) it is
expected that CancerVax will be assigned and assume the rights and obligations
under the JWCI Agreement; and (iii) the cell banks of Cell Lines are currently
stored at JWCI, which are to be removed by July 24, 2001.

         2.3      Licenses. CDL hereby grants to CancerVax a paid-up,
royalty-free, exclusive, worldwide license, with right to sublicense, under
CDL's Patent Rights to develop, make, have made, use, sell, offer for sale and
import Licensed Products and Methods within the Field (the "Patent License").
CDL hereby grants to CancerVax a perpetual, irrevocable, paid-up, royalty-free,
exclusive, worldwide license, with the right to sublicense, to any information,
data, know-how or biological materials owned or controlled by CDL or any of its
affiliates that are related to the Cell Lines. CDL shall disclose, or cause to
be disclosed, to CancerVax upon request any such information, data, know-how or
biological materials.

         2.4      Assignment of Transfer Agreement. CDL hereby assigns to
CancerVax, as of the date hereof and pursuant to Section 16.1 (last sentence) of
the Transfer Agreement, all of CDL's right, title, interest and obligations
under the Transfer Agreement, and CancerVax hereby accepts such assignment and
assumes all of CDL's right, title, interest and obligations under the Transfer
Agreement. CancerVax further agrees to keep, perform, comply with and fulfill
all of the terms and obligations of CDL under the Transfer Agreement.

                                3. CONSIDERATION

         In consideration of the Transfer of the Cell Lines and the licenses
granted under Section 2.3, CancerVax shall pay CDL [***], of which [***] is
allocated to the Transfer and [***] to the license granted under Section 2.3.
The [***] shall be paid to CDL within ten (10) days after CancerVax has
received, in the aggregate, [***] in nonrefundable gross proceeds from one or
more funding transactions (including amounts previously received in funding),
whether for securities of CancerVax, rights to CancerVax's technology, products
(*or services, or options or negotiation rights for such securities, technology,
products or services.

         It is recognized that CancerVax will be responsible for any payments
due under the Transfer Agreement with respect to its use of the Cell Lines.

*** Certain information on this page has been omitted and filed separately with
the Commission. Confidential treatment has been requested with respect to the
omitted portions.

                                       2

<PAGE>

                             4. TERM AND TERMINATION

         4.1      Term. Unless terminated earlier pursuant to this Article 5,
the term of the Patent License shall commence on the Effective Date and continue
in full force and effect on a country-by-country basis until the last to expire
of any patents within CDL's Patent Rights.

         4.2      Termination by CancerVax. CancerVax shall have the right to
terminate any portion of the licenses granted pursuant to Section 2.3 as to any
patent, patent application or Licensed Products and Methods at any time upon
thirty (30) days written notice of termination to CDL.

         4.3      Termination for Breach. Either party may terminate the
licenses granted pursuant to Section 2.3 in the event the other party shall have
materially breached or defaulted in the performance of any of its obligations
hereunder and such breach shall have continued uncured for thirty (30) days
after written notice is given by the nonbreaching party to the breaching party
specifying the breach. Upon termination of the licenses for breach by CancerVax,
any sublicensee of CancerVax who is not then in material breach shall its
sublicense converted to a direct license from CDL under the terms and conditions
of this Agreement, as further limited and restricted by the terms of the
original sublicense.

         4.4      Survival.

                  4.4.1    Termination of the license for any reason shall not
release either party hereto from any liability which, at the time of such
termination, has already accrued to the other party or which is attributable to
a period prior to such termination, nor preclude either party from pursuing any
rights or remedies it may have hereunder or at law or in equity with respect to
any breach of this Agreement.

                  4.4.2    In the event this Agreement is terminated for any
reason, CancerVax and its sublicensees shall have the right to sell or otherwise
dispose of their existing inventory of any Licensed Products and Methods then on
hand within twelve (12) months of such termination.

                  4.4.3    Articles 1, 2.1, 2.2, 2.3 (second sentence), 3, 6, 7,
8, 9 and 10 shall survive the expiration and any termination of this Agreement.

                            5. INTELLECTUAL PROPERTY

         5.1      Diagnostic Technologies. The parties recognize that an
underlying purpose of this Agreement is based on the realization that diagnostic
technologies controlled by CDL and within the scope of CDL's Patent Rights may
be required for the development and commercialization of Licensed Products and
Methods within the Field, and that, to this end, this Agreement covers the use
of such diagnostic technologies only within the Field. Notwithstanding this, the
parties recognize that CDL shall retain all control of such diagnostic
technologies, including the prosecution and other handling of

                                       3

<PAGE>

patents and patent applications within CDL's Patent Rights at CDL's own expense,
as set forth hereinbelow.

         5.2      Patent Prosecution. CDL shall, at its own expense, have the
full right to manage and control the filing for, prosecution and maintenance of
CDL's Patent Rights, but shall, upon request by CancerVax, keep CancerVax
reasonably apprised of all such matters as requested, and consult with CancerVax
in a timely manner concerning (i) the scope and content of patent applications
within the CDL's Patent Rights prior to filing such applications and (ii) the
content of and proposed responses to official actions of the U.S. Patent and
Trademark Offices and foreign patent offices during the prosecution of such
patent applications.

         5.3      Enforcement. Notwithstanding the foregoing, CancerVax has the
right, but not the obligation to enforce and defend the CDL's Patent Rights
against any infringement or misappropriation within the Field of which it
becomes reasonably apprised. CDL agrees to join in any such suit as required.
The costs and expenses incurred with respect to any such enforcement or defense
of the CDL's Patent Rights, and any costs and expenses attendant to any joinder
of CDL, shall be borne by CancerVax. CancerVax agrees to keep CDL reasonably
informed of all developments in connection with any such action.

         5.4      Defense. If CancerVax or any affiliate, sublicensee,
distributor or other customer is sued by a third party charging infringement of
patent rights that are purported to dominate a claim of the CDL's Patent Rights,
CancerVax will promptly notify CDL in writing. CancerVax will control the
defense in any such action at its own expense, provided that CDL shall have the
right to participate in the defense or settlement thereof at his own expense
with counsel of his own choosing. Except as agreed in writing by CDL, CancerVax
shall not enter into any settlement of any such action if such settlement admits
the unpatentability, invalidity or unenforceability of any CDL's Patent Rights.
CancerVax agrees to keep CDL reasonably informed of all developments in
connection with any such action.

         5.5      Cooperation. In any suit, action or other proceeding in
connection with defense or enforcement of the CDL's Patent Rights permitted
hereunder, CDL shall reasonably cooperate with CancerVax with respect to such
proceeding, at CancerVax's expense.

                          6. INSURANCE; INDEMNIFICATION

         6.1      Insurance. CancerVax shall secure and maintain in effect
during the term of the Patent License and for a period of three (3) years
thereafter insurance policy(ies) underwritten by a reputable insurance company
and in a form and having limits standard and customary for the industry. Such
insurance shall include clinical trial liability and product liability coverage
with respect to the development and commercialization of

                                       4

<PAGE>

Licensed Products and Methods. Upon request by CDL, CancerVax shall provide to
CDL certificates of insurance evidencing the coverage required above.

         6.2      Indemnification. CancerVax shall indemnify CDL and any of his
successors and assigns (collectively, the "Indemnitees"), and hold each
Indemnitee harmless from and against any and all liabilities, damages,
settlements, claims, actions, suits, penalties, fines, costs or expenses
(including, without limitation, reasonable attorneys' fees and other expenses of
litigation) incurred by any Indemnitee arising from or occurring as a result of
any claim, action, suit, or other proceeding brought by third parties against an
Indemnitee arising from or occurring as a result of the exercise of the license
rights granted to CancerVax under Section 2.3, including without limitation
product liability claims relating to any Licensed Product and Method used, sold
or otherwise distributed by or on behalf of CancerVax or its Affiliates.
Notwithstanding the foregoing, CancerVax shall have no obligation under this
Section 6.2 with respect to liabilities, damages, settlements, claims, actions,
suits, penalties, fines, costs or expenses to the extent the same is caused by
the gross negligence or willful tortious misconduct of an Indemnitee.

         6.3      Procedure. An Indemnitee that intends to claim indemnification
under this Article 6 shall: (i) promptly notify CancerVax in writing of any
claim, action, suit, or other proceeding brought by third parties in respect of
which the Indemnitee intends to claim such indemnification; (ii) provide
CancerVax sole control of the defense and/or settlement thereof; and (iii)
provide CancerVax, at CancerVax's request and expense, with reasonable
assistance and full information with respect thereto. Notwithstanding the
foregoing, the indemnity obligation in this Article 6 shall not apply to amounts
paid in settlement of any loss, claim, damage, liability or action if such
settlement is effected without an unconditional release of Indemnitees with
respect to such matter or without the consent of CancerVax, to the extent such
consent is not withheld unreasonably. Without limiting the foregoing provisions
of this Section 6.3, CancerVax shall keep CDL reasonably informed of the
progress of any claim, suit or proceeding under this Section 6.3 and CDL shall
have the right to participate in any such claim, suit or proceeding with counsel
of its choosing at its own expense.

                                 7. USE OF NAMES

         Except as required by law or in the normal course of business
identification and description, neither party shall issue any press release or
other public statements in connection with this Agreement intended for use in
the public media in a manner suggesting any endorsement by the other party,
without the prior written approval of such other party, which approval shall not
be unreasonably withheld.

                        8. REPRESENTATIONS AND WARRANTIES

         8.1      CDL. CDL hereby represents and warrants to CancerVax that: (i)
it has the full right and authority to enter into this Agreement and grant the
rights and licenses

                                       5

<PAGE>

granted herein; (ii) it has not previously granted and will not grant during the
term of this Agreement any rights in the (a) CDL's Patent Rights in the Field
that are inconsistent with the rights and licenses granted to CancerVax herein
or (b) Cell Lines; and (iii) to its knowledge, there are no undisclosed claims
of any third parties pending against it that would call into question his right
to grant to CancerVax the rights and licenses contemplated hereunder; and (iv)
CDL owns CDL's Patent Rights.

         8.2      CancerVax. CancerVax hereby represents and warrants to CDL
that: (i) it has the full right and authority to enter into this Agreement and
(ii) to its knowledge, there are no undisclosed claims of any third parties
pending against it that would call into question its right to enter into and
perform its obligations under this Agreement.

         8.3      Disclaimer. EXCEPT AS EXPRESSLY PROVIDED IN THIS ARTICLE 8,
NEITHER PARTY MAKES ANY WARRANTIES OR CONDITIONS (EXPRESS, IMPLIED, STATUTORY,
OR OTHERWISE) WITH RESPECT TO THE SUBJECT MATTER HEREOF, INCLUDING WITHOUT
LIMITATION, CDL's PATENT RIGHTS, CELL LINES AND LICENSED PRODUCTS AND METHODS,
AND CDL SPECIFICALLY DISCLAIMS ANY AND ALL IMPLIED WARRANTIES OR CONDITIONS OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, AND ALL WARRANTIES AND
CONDITIONS OF THE VALIDITY OF THE CDL's PATENT RIGHTS OR NONINFRINGEMENT OF
THIRD PARTY INTELLECTUAL PROPERTY RIGHTS.

                               9. CONFIDENTIALITY

         9.1      Confidential Information. Except as expressly provided herein,
each party shall maintain in confidence, and shall not use for any purpose or
disclose to any third party, information disclosed by the other party in writing
and marked "confidential" or that is disclosed orally and confirmed in writing
as confidential within a reasonable time following such disclosure
(collectively, "Confidential Information"). Notwithstanding the foregoing,
Confidential Information shall not include any information that, in each case as
demonstrated by contemporaneous written documentation: (i) was already known to
the receiving party, other than under an obligation of confidentiality, at the
time of disclosure hereunder; or (ii) was generally available to the public or
otherwise part of the public domain at the time of its disclosure to the
receiving party; or (iii) became generally available to the public or otherwise
part of the public domain after its disclosure, other than through any act or
omission of the receiving party; or (iv) was subsequently lawfully disclosed to
the receiving party by a person other than a party hereto, without an obligation
of confidentiality; or (v) was independently developed by the receiving party
without reference to any information or materials disclosed by the disclosing
party.

         9.2      Permitted Usage. Notwithstanding the provisions of Section 8.1
above, each party may use or disclose the other party's Confidential Information
to the extent such use and disclosure is reasonably necessary in filing or
prosecuting patent applications, prosecuting or defending litigation, complying
with applicable

                                       6

<PAGE>

governmental regulations, submitting information to tax or other governmental
authorities conducting clinical trials or exercising its rights hereunder
(including granting any permitted sublicenses); provided that if a party is
legally required to make any public disclosures of the other party's
Confidential Information, to the extent it may legally do so, it will give
reasonable advance notice to the other party of such disclosure and will use its
reasonable efforts to secure confidential treatment of such Confidential
Information prior to its disclosure (whether through protective orders or
otherwise); provided, further, that CancerVax may disclose Confidential
Information pertaining to the Cell Lines or CDL's Patent Rights to the extent
required in connection with the commercialization of products.

                                   10. GENERAL

         10.1     Independent Contractors. The relationship of CancerVax and CDL
established by this Agreement is that of independent contractors. Nothing in
this Agreement shall be construed to create any other relationship between the
parties. Neither party shall have any express or implied right, power or
authority to assume, create or incur any expense, liability or obligation on
behalf of or in the name of the other party.

         10.2     Confidential Terms. Except as expressly provided herein, each
party agrees not to disclose any terms of this Agreement to any third party
without the prior written consent of the other party, except as required by
securities or other applicable laws and (subject to reasonable conditions of
confidentiality) to prospective and other investors and such party's
accountants, attorneys and other professional advisors.

         10.3     Assignment. This Agreement shall not be assignable by either
party to any third party without the prior written consent of the other party,
except that either party may assign this Agreement without the other party's
consent to an entity that acquires all or substantially all of the business or
assets of the assigning party, in each case whether by sale, merger, transfer of
assets, operation of law or otherwise; provided that in either case, such
assignee or transferee promptly agrees in writing to be bound by the terms and
conditions of this Agreement. Without limiting the foregoing, in the event of
such merger or transfer or acquisition of assets, no intellectual property
rights of the assignee or its affiliate shall be included in CDL's Patent
Rights, to the extent that such intellectual property rights were owned or
controlled by the assignee or its affiliate prior to such merger or transfer or
acquisition of assets. Upon a permitted assignment of this Agreement, all
references herein to the assigning party shall be deemed references to the
assignee. Any assignment not permitted under this Section 10.3 shall be null and
void.

         10.4     Force Majeure. Nonperformance of either party (except for
payment of amounts due hereunder) shall be excused to the extent that
performance is delayed or rendered impracticable by strike, fire, earthquake,
flood, governmental acts or orders or restrictions, or any other reason,
including failure of suppliers, where failure to perform is beyond the
reasonable control of the non-performing party. Without limiting the

                                       7

<PAGE>

foregoing, the party subject to such inability shall use reasonable efforts to
minimize the duration of any force majeure event.

         10.5     Patent Marking. CancerVax agrees to mark, and have its
Affiliates and Sublicensees mark, all Licensed Products sold, imported or
otherwise distributed pursuant to this Agreement in accordance with the
applicable patent statutes or regulations.

         10.6     Notices. All notices, requests and other communications
hereunder shall be made in writing and shall be sent by registered or certified
mail, return receipt requested, postage prepaid; facsimile transmission (receipt
verified); or express courier service (signature required), in each case to the
respective address or fax number specified below, or such other address or fax
number as may be specified in writing to the other party:

              CancerVax:       CancerVax Corporation
                               828 Eastbrook Court
                               Danville, CA 94506-1206
                               Attn: President
                               Fax: 925-736-5910

              with a copy to:  Perkins Coie LLP
                               1201 Third Avenue, 40th Floor
                               Seattle, WA 98101
                               Attn: _______________

              CDL:             Cancer Diagnostic Laboratories, Inc.
                               P.O. Box 970
                               Pacific Palisades, CA 90272
                               Fax: (310)230-4143

              with a copy to:  Fulbright & Jaworski
                               600 Congress Ave., Suite 1900
                               Austin, TX 78701
                               Attn: David L. Parker
                               Fax:(512)474-7577

         10.7     Governing Law. This Agreement shall be governed by, and
construed and interpreted in accordance with, the laws of the State of
California, without regard to conflicts of laws principles.

         10.8     Compliance with Law. CancerVax shall comply with all
applicable laws and regulations in connection with its activities pursuant to
this Agreement.

         10.9     Modification; Waiver. No amendment or modification of any
provision of this Agreement shall be effective unless in writing signed by the
party to be charged. No

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<PAGE>

provision of this Agreement shall be varied, contradicted or explained by any
oral agreement, course of dealing or performance, or any other matter not set
forth in an agreement in writing and signed by both parties hereto. No failure
on the part of either party to exercise, and no delay in exercising any right
under this Agreement or provided by statute or at law or in equity or otherwise,
shall impair, prejudice or constitute a waiver of any such right, nor shall any
partial exercise of any such right preclude any other or further exercise
thereof or the exercise of any other right.

         10.10    Headings. Headings included herein are for convenience only,
do not form a part of this Agreement and shall not be used in any way to
construe or interpret this Agreement.

         10.11    Severability. If any provision hereof should be held invalid,
illegal or unenforceable in any jurisdiction, the parties shall negotiate in
good faith a valid, legal and enforceable substitute provision that most nearly
reflects the original intent of the parties (or shall strike such provision in
the absence of such substitute provision) and all other provisions hereof shall
remain in full force and effect in such jurisdiction and shall be liberally
construed in order to carry out the intentions of the parties hereto as nearly
as may be possible. Such invalidity, illegality or unenforceability shall not
affect the validity, legality or enforceability of such provision in any other
jurisdiction.

         10.12    Bankruptcy. All rights and licenses granted under or pursuant
to this Agreement by CDL to CancerVax are, and shall otherwise be deemed to be,
for purposes of Section 365(n) of Title 11, U.S. Code (the "Bankruptcy Code"),
licenses of rights to "intellectual property" as defined under Section 101(60)
of the Bankruptcy Code. The parties agree that CancerVax, as a licensee of such
rights under this Agreement, shall retain and may fully exercise all of its
rights and elections under the Bankruptcy Code. CDL agrees during the term of
this Agreement to maintain current copies of all such intellectual property
licensed hereunder. The parties further agree that, in the event of the
commencement of a bankruptcy proceeding by or against CDL under the Bankruptcy
Code, CancerVax shall be entitled to a complete duplicate of (or complete access
to, as appropriate) any such intellectual property and all embodiments of such
intellectual property, and the same, if not already in its possession, shall be
promptly delivered to CancerVax, upon written request therefor by CancerVax, (i)
upon any such commencement of a bankruptcy proceeding, unless CDL elects to
continue to perform all of its obligations under this Agreement, or (ii) if not
delivered under clause (a) above, upon the rejection of this Agreement by or on
behalf of CDL.

         10.13    Entire Agreement. This Agreement (including the Appendix)
constitute the entire understanding and agreement between the parties with
respect to the subject matter hereof and supersede any and all prior
negotiations, representations, agreements, and understandings, whether written
or oral, between the parties with respect to such subject matter.

         10.14    Counterparts. This Agreement may be executed in two
counterparts, each of which shall be deemed an original, but both of which
together shall constitute one and the same instrument.

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<PAGE>

         Both CDL and CancerVax have executed this Agreement in duplicate
originals by their authorized officers on the dates written below:

CANCERVAX CORPORATION                   CANCER DIAGNOSTIC
________________________________________LABORATORIES, INC.

By /s/ A. E. MAIDA III                  By /s/ Donald L. Morton
   ---------------------------             ---------------------------

Name A. E. MAIDA III                    Name Donald L. Morton

Title President                         Title Chairman

                                       10

<PAGE>

                                   EXHIBIT 1

                               Transfer Agreement

                                       11

<PAGE>

                                   EXHIBIT 2

                                Gupta Assignment

                                       12

<PAGE>

                                   APPENDIX A

                               Original Materials

TISSUE ORIGIN                      DONOR NAME

1.   Melanoma                        [***]
2.   Melanoma                        [***]
3.   Melanoma                        [***]
4.   Melanoma                        [***]
5.   Melanoma                        [***]
6.   Melanoma                        [***]
7.   Melanoma                        [***]
8.   Melanoma                        [***]
9.   Melanoma                        [***]
10.  Melanoma                        [***]
11.  Lung Cancer                     [***]
12.  Lung Cancer                     [***]
13.  Lung Cancer                     [***]
14.  Lung Cancer                     [***]
15.  Colon Cancer                    [***]
16.  Sarcoma                         [***]
17.  Sarcoma                         [***]
18.  Breast Cancer                   [***]
19.  Renal Cancer                    [***]
20.  Sweat Gland                     [***]

*** Certain information on this page has been omitted and filed separately with
the Commission. Confidential treatment has been requested with respect to the
omitted portions.

                                       13<PAGE>

                                                                   EXHIBIT 10.24

                        AMENDMENT NO. 1 TO CDL AGREEMENT

         This Amendment No. 1 to CDL Agreement is made and entered into as of
December 15, 2000, by and between Cancer Diagnostic Laboratories, Inc., a
California corporation ("CDL"), and CancerVax Corporation, a Delaware
corporation ("CancerVax").

                                    RECITALS

         A.       CDL and CancerVax are parties to an Agreement dated July 31,
2000, relating to a quitclaim of certain cell lines and license of certain
technology to CancerVax (the "CDL Agreement").

         B.       Dr. Donald L. Morton ("Morton") and CancerVax are entering
into, as of the date hereof, a Contribution of Technology and Exchange Agreement
(the "Contribution Agreement"). Pursuant to Section 4 of the Contribution
Agreement, it is recognized and agreed that Morton is in the process of filing
divisionals of certain foreign patent applications in the name of CDL and that,
pursuant to Section 7 of the Contribution Agreement, such diagnostic divisionals
will be added to CancerVax's license rights under the CDL Agreement that relate
to the treatment or prevention of cancer in humans through the use of products
or methodologies that employ an antigen-containing vaccine.

         C.       The parties desire to amend the CDL Agreement to add the
divisionals of certain foreign patent applications, upon the terms and
conditions set forth herein.

         NOW THEREFORE, the parties hereby agree as follows:

         1.       Section 1.1 of the CDL Agreement shall be amended to read in
its entirety as follows:

                  "1.1     "CDL's Patent Rights" shall mean patent rights
                  claimed in or covered under (a) U.S. patent application SN
                  431,533, filed November 3, 1989, including any divisionals,
                  continuations, continuations-in-part, foreign counterparts,
                  any United States or foreign patents issuing therefrom, as
                  well as any extensions, reexaminations or reissues thereof and
                  (b) the divisionals being created from Japanese Published
                  Patent Application No. 90/500470 and Canadian Patent
                  Application No. 2,072,620, including any divisionals,
                  continuations, continuations in part or

<PAGE>

                  patents issuing therefrom, as well as any extensions,
                  reexaminations or reissues thereof."

         2.       All other terms and conditions of the CDL Agreement remain in
full force and effect.

         IN WITNESS WHEREOF, the undersigned have executed this Amendment
effective as of the date and year first above written.

                                           Cancer Diagnostics Labs, Inc.

                                           By: /s/ Donald L. Morton
                                               --------------------------------
                                           Its: President

                                           CancerVax Corporation

                                           By: /s/ David F. Hale
                                               --------------------------------
                                           Its: Chief Executive Officer

                                      -2-

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