Document:

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                                                                    EXHIBIT 10.4

                              CANCERVAX CORPORATION
              AMENDED AND RESTATED 2003 EQUITY INCENTIVE AWARD PLAN

                             STOCK OPTION AGREEMENT

            THIS AGREEMENT, dated as of the Grant Date set forth on Exhibit A
hereto, (the terms of which are hereby incorporated by reference and made a part
of this Agreement) is made by and between CancerVax Corporation, a Delaware
corporation, hereinafter referred to as the "Company," and the Associate,
Director or consultant of the Company, or a Subsidiary of the Company,
identified on Exhibit A and hereinafter referred to as "Optionee."

            [FOR EXECUTIVE OFFICERS ONLY: WHEREAS, the Company and the Optionee
are parties to that certain Second Amended and Restated Employment Agreement
effective as of November 15, 2004 (the "Employment Agreement"); and]

            WHEREAS, the Company wishes to afford the Optionee the opportunity
to purchase shares of its Stock, par value $0.00004 per share; and

            WHEREAS, the Company wishes to carry out the CancerVax Corporation
Amended and Restated 2003 Equity Incentive Award Plan (the "Plan") (the terms of
which are hereby incorporated by reference and made a part of this Agreement);
and

            WHEREAS, the Committee appointed to administer the Plan has
determined that it would be to the advantage and best interest of the Company
and its stockholders to grant the Option provided for herein to the Optionee as
an inducement to enter into or remain in the service of the Company or its
Subsidiaries and as an incentive during such service, and has advised the
Company thereof and instructed the undersigned officer to issue said Option.

            NOW, THEREFORE, in consideration of the mutual covenants herein
contained and other good and valuable consideration, the receipt of which is
hereby acknowledged, the parties hereto do hereby agree as follows:

                                    ARTICLE I

                                   DEFINITIONS

            1.1 General. Wherever the following terms are used in this Agreement
they shall have the meanings specified below, unless the context clearly
indicates otherwise. Capitalized terms not specifically defined herein shall
have the meanings specified in the Plan.

            1.2 Associate. "Associate" shall mean an Employee.

            1.3 Director. "Director" shall mean a member of the Board.
"Director" shall include both a member of the Board who is an Associate and a
"Non-Employee Director" (as defined in the Plan).

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            1.4 Exercise Notice. "Exercise Notice" shall mean a written notice
to the Company, substantially in the form attached hereto as Exhibit B (or such
other form as the Committee shall approve), stating that the Option or a portion
of the Option is exercised.

            1.5 Grant Date. "Grant Date" shall mean the date of grant set forth
on Exhibit A.

            1.6 Secretary. "Secretary" shall mean the Secretary of the Company.

            1.7 Termination of Service. "Termination of Service" shall mean the
time when the service relationship (whether as an Associate, a Director or a
consultant) between the Optionee and the Company or any Subsidiary is terminated
for any reason, with or without Cause, including, but not by way of limitation,
a termination by resignation, discharge, death or Disability; but excluding (a)
a termination where there is a simultaneous reemployment or continuing
employment or consultancy of the Optionee by the Company or any Subsidiary or a
parent corporation thereof (within the meaning of Section 422 of the Code), (b)
at the discretion of the Committee, a termination which results in a temporary
severance of the employee-employer relationship, and (c) at the discretion of
the Committee, a termination which is followed by the simultaneous establishment
of a consulting relationship by the Company or a Subsidiary with the former
Associate. The Committee, in its absolute discretion, shall determine the effect
of all matters and questions relating to Termination of Service for the purposes
of this Agreement, including, but not by way of limitation, the question of
whether, for Optionees who are Associates of the Company or any of its
Subsidiaries, a Termination of Service resulted from a discharge for Cause, and
all questions of whether particular leaves of absence for Optionees who are
Associates of the Company or any of its Subsidiaries constitute Terminations of
Service; provided, however, that, if this Option is designated as an Incentive
Stock Option, unless otherwise determined by the Committee in its discretion, a
leave of absence, change in status from an Associate to an independent
contractor or other change in the employee-employer relationship shall
constitute a Termination of Service if, and to the extent that, such leave of
absence, change in status or other change interrupts employment for the purposes
of Section 422(a)(2) of the Code and the then applicable regulations and revenue
rulings under said Section. Notwithstanding any other provision of the Plan or
this Agreement, the Company or any Subsidiary has an absolute and unrestricted
right to terminate the Optionee's employment and/or consultancy at any time for
any reason whatsoever, with or without Cause, except to the extent expressly
provided otherwise in a written agreement between the Company and the Optionee.

                                   ARTICLE II

                                 GRANT OF OPTION

            2.1 Grant of Option. In consideration of the Optionee's agreement to
remain in the employ of the Company or its Subsidiaries, if Optionee is an
Associate, or to continue to provide services to the Company or its
Subsidiaries, if Optionee is a consultant, or to serve on the Company's Board of
Directors, if Optionee is a Director, and for other good and valuable
consideration, effective as of the Grant Date, the Company irrevocably grants to
the Optionee the Option to purchase any part or all of an aggregate of the
number of shares of Stock set forth on

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Exhibit A, upon the terms and conditions set forth in this Agreement. Unless
designated as a Non-Qualified Stock Option on Exhibit A, the Option shall be an
Incentive Stock Option to the maximum extent permitted by law.

            2.2 Purchase Price. The purchase price of the shares of Stock
subject to the Option per share shall be as set forth on Exhibit A hereto,
without commission or other charge; provided, however, that if this Option is
designated as an Incentive Stock Option the price per share of the shares
subject to the Option shall not be less than the greater of (i) 100% of the Fair
Market Value of a share of Stock on the Grant Date, or (ii) 110% of the Fair
Market Value of a share of Stock on the Grant Date in the case of an Optionee
then owning (within the meaning of Section 424(d) of the Code) more than 10% of
the total combined voting power of all classes of stock of the Company or any
subsidiary corporation or parent corporation thereof (each within the meaning of
Section 422 of the Code).

            2.3 Consideration to the Company. In consideration of the granting
of the Option by the Company, the Optionee agrees to render faithful and
efficient services to the Company or any Subsidiary. Nothing in the Plan or this
Agreement shall confer upon the Optionee any right to (a) continue in the employ
of the Company or any Subsidiary or shall interfere with or restrict in any way
the rights of the Company and its Subsidiaries, which are hereby expressly
reserved, to discharge the Optionee, if the Optionee is an Associate, or (b)
continue to provide services to the Company or any Subsidiary or shall interfere
with or restrict in any way the rights of the Company or its Subsidiaries, which
are hereby expressly reserved, to terminate the services of Optionee, if the
Optionee is a consultant, at any time for any reason whatsoever, with or without
Cause, except to the extent expressly provided otherwise in a written agreement
between the Company and the Optionee.

                                   ARTICLE III

                            PERIOD OF EXERCISABILITY

            3.1 Commencement of Exercisability.

            (a) Subject to Sections 3.3 and 5.10, the Option shall become
exercisable in such amounts and at such times as are set forth in Exhibit A
hereto.

            (b) No portion of the Option which has not become exercisable at
Termination of Service shall thereafter become exercisable, except as may be
otherwise provided by the Committee or as set forth in a written agreement
between the Company and the Optionee [FOR EXECUTIVE OFFICERS ONLY:, including,
without limitation, the Employment Agreement].

            3.2 Duration of Exercisability. The installments provided for in
Section 3.1(a) and Exhibit A hereto are cumulative. Each such installment which
becomes exercisable pursuant to Section 3.1 shall remain exercisable until it
becomes unexercisable under Section 3.3.

            3.3 Expiration of Option. The Option may not be exercised to any
extent by anyone after the first to occur of the following events:

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            (a) The expiration of ten (10) years from the Grant Date; or

            (b) If this Option is designated as an Incentive Stock Option and
the Optionee owned (within the meaning of Section 424(d) of the Code), at the
time the Option was granted, more than ten percent (10%) of the total combined
voting power of all classes of stock of the Company or any Subsidiary or parent
corporation thereof (within the meaning of Section 422 of the Code), the
expiration of five years from the date the Option was granted; or

            (c) Except as set forth in a written agreement with the Company [FOR
EXECUTIVE OFFICERS ONLY: including, without limitation, the Employment
Agreement], the expiration of ninety (90) days following the date of the
Optionee's Termination of Service [FOR EXECUTIVE OFFICERS ONLY: (or, if later,
with respect to any portion of the Option that becomes exercisable pursuant to
Section 4(g)(iv) of the Employment Agreement, ninety (90) days following the
date such portion of the Option becomes exercisable)], unless, if the Optionee
is an Associate of the Company or any of its Subsidiaries, such Termination of
Service occurs by reason of the Optionee's discharge for Cause, or by reason of
the Optionee's death or Disability;

            (d) The date of the Optionee's Termination of Service by reason of
the Optionee's discharge for Cause if the Optionee is an Associate of the
Company or any of its Subsidiaries; or

            (e) The expiration of one year following the date of the Optionee's
Termination of Service by reason of the Optionee's death or Disability if
Optionee is an Associate of the Company or any of its Subsidiaries.

            3.4 Special Tax Consequences. The Optionee acknowledges that, to the
extent that the aggregate Fair Market Value of stock with respect to which
Incentive Stock Options (but without regard to Section 422(d) of the Code),
including the Option, are exercisable for the first time by the Optionee during
any calendar year (under the Plan and all other incentive stock option plans of
the Company, any subsidiary corporation and any parent corporation thereof (each
within the meaning of Section 422 of the Code)) exceeds $100,000, the Option and
such other options shall be treated as not qualifying under Section 422 of the
Code but rather shall be taxed as Non-Qualified Stock Options. The Optionee
further acknowledges that the rule set forth in the preceding sentence shall be
applied by taking options into account in the order in which they were granted.
For purposes of these rules, the Fair Market Value of Stock shall be determined
as of the time the option with respect to such Stock is granted.

            3.5 Acceleration Upon Death or Disability. In the event of the
Optionee's termination of employment or service on account of Disability or
death, that number of shares subject to the Option that would have become fully
vested and exercisable over the twelve (12) months following the Optionee's
termination under the vesting schedule applicable to the Option set forth in
Exhibit A hereto had the Optionee remained continuously employed by or providing
services to the Company during such period shall immediately become so vested
and exercisable on the date of termination.

                                   ARTICLE IV

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                               EXERCISE OF OPTION

            4.1 Person Eligible to Exercise. Except as provided in Sections
5.2(b) and 5.2(c), during the lifetime of the Optionee, only the Optionee may
exercise the Option or any portion thereof. After the death of the Optionee, any
exercisable portion of the Option may, prior to the time when the Option becomes
unexercisable under Section 3.3, be exercised by the Optionee's beneficiary
designated in accordance with Section 10.4 of the Plan. If no beneficiary has
been designated or survives the Optionee, the Option may be exercised by the
person entitled to such exercise pursuant to the Optionee's will or the laws of
descent and distribution.

            4.2 Partial Exercise. Any exercisable portion of the Option or the
entire Option, if then wholly exercisable, may be exercised in whole or in part
at any time prior to the time when the Option or portion thereof becomes
unexercisable under Section 3.3.

            4.3 Manner of Exercise. The Option, or any exercisable portion
thereof, may be exercised solely by delivery to the Secretary or the Secretary's
office of all of the following prior to the time when the Option or such portion
thereof becomes unexercisable under Section 3.3:

            (a) An Exercise Notice in writing signed by the Optionee or the
other person then entitled to exercise the Option or portion thereof, stating
that the Option or portion thereof is thereby exercised, such notice complying
with all applicable rules established by the Committee. Such notice shall be
substantially in the form attached as Exhibit B (or such other form as is
prescribed by the Committee); and

            (b) (i) Full payment (in cash or by check) for the shares with
      respect to which the Option or portion thereof is exercised, to the extent
      permitted under applicable laws; or

                  (ii) With the consent of the Committee, such payment may be
      made, in whole or in part, through the delivery of shares of Stock which
      have been owned by the Optionee for at least six months, duly endorsed for
      transfer to the Company with a Fair Market Value on the date of delivery
      equal to the aggregate exercise price of the Option or exercised portion
      thereof; or

                  (iii) To the extent permitted under applicable laws, through
      the delivery of a notice that the Optionee has placed a market sell order
      with a broker with respect to shares of Stock then issuable upon exercise
      of the Option, and that the broker has been directed to pay a sufficient
      portion of the net proceeds of the sale to the Company in satisfaction of
      the Option exercise price, provided, that payment of such proceeds is made
      to the Company upon settlement of such sale; or

                  (iv) With the consent of the Committee, any combination of the
      consideration provided in the foregoing subparagraphs (i), (ii) and (iii);
      and

            (c) A bona fide written representation and agreement, in such form
as is prescribed by the Committee, signed by the Optionee or other person then
entitled to exercise

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such Option or portion thereof, stating that the shares of Stock are being
acquired for the Optionee's own account, for investment and without any present
intention of distributing or reselling said shares or any of them except as may
be permitted under the Securities Act and then applicable rules and regulations
thereunder, and that the Optionee or other person then entitled to exercise such
Option or portion thereof will indemnify the Company against and hold it free
and harmless from any loss, damage, expense or liability resulting to the
Company if any sale or distribution of the shares by such person is contrary to
the representation and agreement referred to above. The Committee may, in its
absolute discretion, take whatever additional actions it deems appropriate to
ensure the observance and performance of such representation and agreement and
to effect compliance with the Securities Act and any other federal or state
securities laws or regulations. Without limiting the generality of the
foregoing, the Committee may require an opinion of counsel acceptable to it to
the effect that any subsequent transfer of shares acquired on an Option exercise
does not violate the Securities Act, and may issue stop-transfer orders covering
such shares. Share certificates evidencing Stock issued on exercise of the
Option shall bear an appropriate legend referring to the provisions of this
subsection (c) and the agreements herein. The written representation and
agreement referred to in the first sentence of this subsection (c) shall,
however, not be required if the shares to be issued pursuant to such exercise
have been registered under the Securities Act, and such registration is then
effective in respect of such shares; and

            (d) Full payment to the Company (or other employer corporation) of
all amounts which, under federal, state or local tax law, it is required to
withhold upon exercise of the Option. With the consent of the Committee, (i)
shares of Stock owned by the Optionee for at least six months duly endorsed for
transfer or (ii) shares of Stock issuable to the Optionee upon exercise of the
Option, having a Fair Market Value at the date of Option exercise equal to the
statutory minimum sums required to be withheld, may be used to make all or part
of such payment; and

            (e) In the event the Option or portion thereof shall be exercised
pursuant to Section 4.1 by any person or persons other than the Optionee,
appropriate proof of the right of such person or persons to exercise the Option.

            4.4 Conditions to Issuance of Stock Certificates. The shares of
Stock deliverable upon the exercise of the Option, or any portion thereof, may
be either previously authorized but unissued shares or issued shares which have
then been reacquired by the Company. Such shares shall be fully paid and
nonassessable. The Company shall not be required to issue or deliver any
certificate or certificates for shares of Stock purchased upon the exercise of
the Option or portion thereof prior to fulfillment of all of the following
conditions:

            (a) The admission of such shares to listing on all stock exchanges
on which such Stock is then listed; and

            (b) The completion of any registration or other qualification of
such shares under any state or federal law or under rulings or regulations of
the Securities and Exchange Commission or of any other governmental regulatory
body, which the Committee shall, in its absolute discretion, deem necessary or
advisable; and

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            (c) The obtaining of any approval or other clearance from any state
or federal governmental agency which the Committee shall, in its absolute
discretion, determine to be necessary or advisable; and

            (d) The receipt by the Company of full payment for such shares,
including payment of all amounts which, under federal, state or local tax law,
the Company (or other employer corporation) is required to withhold upon
exercise of the Option; and

            (e) The lapse of such reasonable period of time following the
exercise of the Option as the Committee may from time to time establish for
reasons of administrative convenience.

            4.5 Rights as Stockholder. The holder of the Option shall not be,
nor have any of the rights or privileges of, a stockholder of the Company in
respect of any shares purchasable upon the exercise of any part of the Option
unless and until certificates representing such shares shall have been issued by
the Company to such holder.

                                    ARTICLE V

                                OTHER PROVISIONS

            5.1 Administration. The Committee shall have the power to interpret
the Plan and this Agreement and to adopt such rules for the administration,
interpretation and application of the Plan as are consistent therewith and to
interpret, amend or revoke any such rules. All actions taken and all
interpretations and determinations made by the Committee in good faith shall be
final and binding upon the Optionee, the Company and all other interested
persons. No member of the Committee shall be personally liable for any action,
determination or interpretation made in good faith with respect to the Plan,
this Agreement or the Option. In its absolute discretion, the Board may at any
time and from time to time exercise any and all rights and duties of the
Committee under the Plan and this Agreement.

            5.2 Option Not Transferable.

            (a) Subject to Section 5.2(b), the Option may not be sold, pledged,
assigned or transferred in any manner other than by will or the laws of descent
and distribution unless and until the Option has been exercised, or the shares
underlying such Option have been issued, and all restrictions applicable to such
shares have lapsed. Neither the Option nor any interest or right therein shall
be liable for the debts, contracts or engagements of the Optionee or his or her
successors in interest or shall be subject to disposition by transfer,
alienation, anticipation, pledge, encumbrance, assignment or any other means
whether such disposition be voluntary or involuntary or by operation of law by
judgment, levy, attachment, garnishment or any other legal or equitable
proceedings (including bankruptcy), and any attempted disposition thereof shall
be null and void and of no effect, except to the extent that such disposition is
permitted by the preceding sentence.

            (b) Notwithstanding any other provision in this Agreement, with the
consent of the Committee and to the extent the Option is not intended to qualify
as an Incentive Stock

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Option, the Option may be transferred to, and exercised by and paid to certain
persons or entities related to the Optionee, including but not limited to
members of the Optionee's family, charitable institutes or trusts or other
entities whose beneficiaries or beneficial owners are members of the Optionee's
family or to such other persons or entities as may be expressly approved by the
Committee (each a "Permitted Transferee"), pursuant to such conditions and
procedures as the Committee may require.

            (c) Unless transferred to a Permitted Transferee in accordance with
Section 5.2(b), during the lifetime of the Optionee, only the Optionee may
exercise the Option (or any portion thereof). Subject to such conditions and
procedures as the Committee may require, a Permitted Transferee may exercise the
Option or any portion thereof during the Optionee's lifetime. After the death of
the Optionee, any exercisable portion of the Option may, prior to the time when
the Option portion becomes unexercisable under Section 3.3, be exercised by the
Optionee's beneficiary designated in accordance with Section 10.4 of the Plan.
If no beneficiary has been designated or survives the Optionee, the Option may
be exercised by the person entitled to such exercise pursuant to the Optionee's
will or the laws of descent and distribution.

            5.3 Restrictive Legends and Stop-Transfer Orders.

            (a) The share certificate or certificates evidencing the shares of
Stock purchased hereunder shall be endorsed with any legends that may be
required by state or federal securities laws.

            (b) The Optionee agrees that, in order to ensure compliance with the
restrictions referred to herein, the Company may issue appropriate "stop
transfer" instructions to its transfer agent, if any, and that, if the Company
transfers its own securities, it may make appropriate notations to the same
effect in its own records.

            (c) The Company shall not be required: (i) to transfer on its books
any shares of Stock that have been sold or otherwise transferred in violation of
any of the provisions of this Agreement, or (ii) to treat as owner of such
shares of Stock or to accord the right to vote or pay dividends to any purchaser
or other transferee to whom such shares shall have been so transferred.

            5.4 Shares to Be Reserved. The Company shall at all times during the
term of the Option reserve and keep available such number of shares of Stock as
will be sufficient to satisfy the requirements of this Agreement.

            5.5 Notices. Any notice to be given under the terms of this
Agreement to the Company shall be addressed to the Company in care of the
Secretary, and any notice to be given to the Optionee shall be addressed to the
Optionee at the address given beneath the Optionee's signature hereto. By a
notice given pursuant to this Section 5.5, either party may hereafter designate
a different address for notices to be given to that party. Any notice which is
required to be given to the Optionee shall, if the Optionee is then deceased, be
given to the Optionee's designated beneficiary, if any, or the person otherwise
entitled to exercise his or her Option pursuant to Section 4.1 by written notice
under this Section 5.5. Any notice shall be deemed duly given when sent via
email or enclosed in a properly sealed envelope or wrapper addressed

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as aforesaid and deposited (with postage prepaid) in a post office or branch
post office regularly maintained by the United States Postal Service.

            5.6 Titles. Titles are provided herein for convenience only and are
not to serve as a basis for interpretation or construction of this Agreement.

            5.7 Stockholder Approval. The Plan will be submitted for approval by
the Company's stockholders within 12 months after the date the Plan was
initially adopted by the Board. The Option may not be exercised to any extent by
anyone prior to the time when the Plan is approved by the stockholders, and if
such approval has not been obtained by the end of said 12 month period, the
Option shall thereupon be canceled and become null and void.

            5.8 Notification of Disposition. If this Option is designated as an
Incentive Stock Option, the Optionee shall give prompt notice to the Company of
any disposition or other transfer of any shares of stock acquired under this
Agreement if such disposition or transfer is made (a) within two years from the
Grant Date with respect to such shares or (b) within one year after the transfer
of such shares to him. Such notice shall specify the date of such disposition or
other transfer and the amount realized, in cash, other property, assumption of
indebtedness or other consideration, by the Optionee in such disposition or
other transfer.

            5.9 Construction. This Agreement shall be administered, interpreted
and enforced under the laws of the State of California without regard to
conflicts of laws thereof.

            5.10 Conformity to Securities Laws. The Optionee acknowledges that
the Plan is intended to conform to the extent necessary with all provisions of
the Securities Act and the Exchange Act and any and all regulations and rules
promulgated by the Securities and Exchange Commission thereunder, and state
securities laws and regulations. Notwithstanding anything herein to the
contrary, the Plan shall be administered, and the Option is granted and may be
exercised, only in such a manner as to conform to such laws, rules and
regulations. To the extent permitted by applicable law, the Plan and this
Agreement shall be deemed amended to the extent necessary to conform to such
laws, rules and regulations.

            5.11 Amendments. This Agreement may not be modified, amended or
terminated except by an instrument in writing, signed by the Optionee or such
other person as may be permitted to exercise the Option pursuant to Section 4.1
and by a duly authorized representative of the Company.

                            (signature page follows)

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            IN WITNESS WHEREOF, this Agreement has been executed and delivered
by the parties hereto.

                                               CANCERVAX CORPORATION

                                               By:__________________________

___________________________________
           Optionee Name

___________________________________

___________________________________
             Address

Optionee's Social Security Number:

___________________________________

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                                    EXHIBIT A

                             STOCK OPTION AGREEMENT

                           dated _____________, _____,
                                 by and between
                              CancerVax Corporation
                            and _____________________
                                (the "Agreement")

Optionee's Name: ___________________________________________

Optionee's Address: ______________________________________

                 ___________________________________________

Optionee's Social Security Number: _______________________

Type of Option (check one):

            [ ]   Incentive Stock Option

            [ ]   Non-Qualified Stock Option

Date of Grant:___________________________________________

Vesting Commencement Date: ______________________________

            1. Pursuant to Section 2.1 of the Agreement, the Company grants an
option to purchase any part or all of an aggregate of _____________ shares of
Stock ("Option Shares") at a price per share of $_______ upon the terms and
conditions set forth in the Agreement.

            2. In accordance with Section 3.1(a) of the Agreement and subject to
stockholder approval of the Plan, the Option shall become exercisable in
cumulative installments, rounded down to the nearest whole number of shares, as
follows:

            (a) One-fourth (1/4) of the Option Shares will vest one year after
      the Vesting Commencement Date.

            (b) The remainder of the Option Shares will vest monthly thereafter
      over the following three (3) years at a rate of 1/36th of the shares each
      month.

            3. Capitalized terms not otherwise defined herein shall have the
meanings assigned thereto in the Agreement.

<PAGE>

                                    EXHIBIT B

                             FORM OF EXERCISE NOTICE

CancerVax Corporation
Attention: Corporate Secretary

            Re:   Exercise of Stock Option

Ladies and Gentlemen:

      1. Exercise of Option. The undersigned Optionee, _______________________,
was granted an option (the "Option") to purchase shares of the Common Stock, par
value $0.00004 per share ("Common Stock"), of CancerVax Corporation, a Delaware
corporation (the "Company"), effective as of ____________, pursuant to the Stock
Option Agreement, dated ________________ (the "Option Agreement"). The
undersigned hereby elects to exercise the Option as follows:

            (a)   The undersigned hereby elects to exercise the Option as to
                  ___________ shares of the Common Stock, in accordance with
                  Section 3.1 of the Option Agreement (the "Shares").

            (b)   This date of this exercise is _________ __, ____.

      2. Payment. The undersigned has enclosed herewith __________ (representing
full payment for such Shares in accordance with Section 4.3 of the Option
Agreement). The undersigned authorizes payroll withholding and otherwise will
make adequate provision for the tax withholding obligations of the Company, if
any, with respect to such exercise.

      3. Binding Effect. The undersigned agrees that the Shares are being
acquired in accordance with and subject to the terms, provisions and conditions
of the Option Agreement set forth therein, to all of which the undersigned
hereby expressly assent. This Agreement shall inure to the benefit of and be
binding upon the heirs, executors, administrators, successors and assigns of the
undersigned.

            The undersigned understands that she is purchasing the Shares
pursuant to the terms of the Option Agreement, a copy of which the undersigned
has received and carefully read and understands.

                                         __________________________________

Receipt of the above is hereby acknowledged

CANCERVAX CORPORATION,
a Delaware corporation

By:____________________________

Title:_________________________<PAGE>

                                                                    EXHIBIT 10.5

                                                      *PERFORMANCE-BASED VESTING

                              CANCERVAX CORPORATION
              AMENDED AND RESTATED 2003 EQUITY INCENTIVE AWARD PLAN

                             STOCK OPTION AGREEMENT

            THIS AGREEMENT, dated as of the Grant Date set forth on Exhibit A
hereto, (the terms of which are hereby incorporated by reference and made a part
of this Agreement) is made by and between CancerVax Corporation, a Delaware
corporation, hereinafter referred to as the "Company," and the Associate,
Director or consultant of the Company, or a Subsidiary of the Company,
identified on Exhibit A and hereinafter referred to as "Optionee."

            [FOR EXECUTIVE OFFICERS ONLY: WHEREAS, the Company and the Optionee
are parties to that certain Second Amended and Restated Employment Agreement
effective as of November 15, 2004 (the "Employment Agreement"); and]

            WHEREAS, the Company wishes to afford the Optionee the opportunity
to purchase shares of its Stock, par value $0.00004 per share; and

            WHEREAS, the Company wishes to carry out the CancerVax Corporation
Amended and Restated 2003 Equity Incentive Award Plan (the "Plan") (the terms of
which are hereby incorporated by reference and made a part of this Agreement);
and

            WHEREAS, the Committee appointed to administer the Plan has
determined that it would be to the advantage and best interest of the Company
and its stockholders to grant the Option provided for herein to the Optionee as
an inducement to enter into or remain in the service of the Company or its
Subsidiaries and as an incentive during such service, and has advised the
Company thereof and instructed the undersigned officer to issue said Option.

            NOW, THEREFORE, in consideration of the mutual covenants herein
contained and other good and valuable consideration, the receipt of which is
hereby acknowledged, the parties hereto do hereby agree as follows:

                                    ARTICLE I

                                   DEFINITIONS

            1.1 General. Wherever the following terms are used in this Agreement
they shall have the meanings specified below, unless the context clearly
indicates otherwise. Capitalized terms not specifically defined herein shall
have the meanings specified in the Plan.

            1.2 Associate. "Associate" shall mean an Employee.

            1.3 Director. "Director" shall mean a member of the Board.
"Director" shall include both a member of the Board who is an Associate and a
"Non-Employee Director" (as defined in the Plan).

                                       1
<PAGE>

            1.4 Exercise Notice. "Exercise Notice" shall mean a written notice
to the Company, substantially in the form attached hereto as Exhibit B (or such
other form as the Committee shall approve), stating that the Option or a portion
of the Option is exercised.

            1.5 Grant Date. "Grant Date" shall mean the date of grant set forth
on Exhibit A.

            1.6 Secretary. "Secretary" shall mean the Secretary of the Company.

            1.7 Termination of Service. "Termination of Service" shall mean the
time when the service relationship (whether as an Associate, a Director or a
consultant) between the Optionee and the Company or any Subsidiary is terminated
for any reason, with or without Cause, including, but not by way of limitation,
a termination by resignation, discharge, death or Disability; but excluding (a)
a termination where there is a simultaneous reemployment or continuing
employment or consultancy of the Optionee by the Company or any Subsidiary or a
parent corporation thereof (within the meaning of Section 422 of the Code), (b)
at the discretion of the Committee, a termination which results in a temporary
severance of the employee-employer relationship, and (c) at the discretion of
the Committee, a termination which is followed by the simultaneous establishment
of a consulting relationship by the Company or a Subsidiary with the former
Associate. The Committee, in its absolute discretion, shall determine the effect
of all matters and questions relating to Termination of Service for the purposes
of this Agreement, including, but not by way of limitation, the question of
whether, for Optionees who are Associates of the Company or any of its
Subsidiaries, a Termination of Service resulted from a discharge for Cause, and
all questions of whether particular leaves of absence for Optionees who are
Associates of the Company or any of its Subsidiaries constitute Terminations of
Service; provided, however, that, if this Option is designated as an Incentive
Stock Option, unless otherwise determined by the Committee in its discretion, a
leave of absence, change in status from an Associate to an independent
contractor or other change in the employee-employer relationship shall
constitute a Termination of Service if, and to the extent that, such leave of
absence, change in status or other change interrupts employment for the purposes
of Section 422(a)(2) of the Code and the then applicable regulations and revenue
rulings under said Section. Notwithstanding any other provision of the Plan or
this Agreement, the Company or any Subsidiary has an absolute and unrestricted
right to terminate the Optionee's employment and/or consultancy at any time for
any reason whatsoever, with or without Cause, except to the extent expressly
provided otherwise in a written agreement between the Company and the Optionee.

                                   ARTICLE II

                                 GRANT OF OPTION

            2.1 Grant of Option. In consideration of the Optionee's agreement to
remain in the employ of the Company or its Subsidiaries, if Optionee is an
Associate, or to continue to provide services to the Company or its
Subsidiaries, if Optionee is a consultant, or to serve on the Company's Board of
Directors, if Optionee is a Director, and for other good and valuable
consideration, effective as of the Grant Date, the Company irrevocably grants to
the Optionee the Option to purchase any part or all of an aggregate of the
number of shares of Stock set forth on Exhibit A, upon the terms and conditions
set forth in this Agreement. Unless designated as a

                                       2
<PAGE>

Non-Qualified Stock Option on Exhibit A, the Option shall be an Incentive Stock
Option to the maximum extent permitted by law.

            2.2 Purchase Price. The purchase price of the shares of Stock
subject to the Option per share shall be as set forth on Exhibit A hereto,
without commission or other charge; provided, however, that if this Option is
designated as an Incentive Stock Option the price per share of the shares
subject to the Option shall not be less than the greater of (i) 100% of the Fair
Market Value of a share of Stock on the Grant Date, or (ii) 110% of the Fair
Market Value of a share of Stock on the Grant Date in the case of an Optionee
then owning (within the meaning of Section 424(d) of the Code) more than 10% of
the total combined voting power of all classes of stock of the Company or any
subsidiary corporation or parent corporation thereof (each within the meaning of
Section 422 of the Code).

            2.3 Consideration to the Company. In consideration of the granting
of the Option by the Company, the Optionee agrees to render faithful and
efficient services to the Company or any Subsidiary. Nothing in the Plan or this
Agreement shall confer upon the Optionee any right to (a) continue in the employ
of the Company or any Subsidiary or shall interfere with or restrict in any way
the rights of the Company and its Subsidiaries, which are hereby expressly
reserved, to discharge the Optionee, if the Optionee is an Associate, or (b)
continue to provide services to the Company or any Subsidiary or shall interfere
with or restrict in any way the rights of the Company or its Subsidiaries, which
are hereby expressly reserved, to terminate the services of Optionee, if the
Optionee is a consultant, at any time for any reason whatsoever, with or without
Cause, except to the extent expressly provided otherwise in a written agreement
between the Company and the Optionee.

                                   ARTICLE III

                            PERIOD OF EXERCISABILITY

            3.1 Commencement of Exercisability.

            (a) Subject to Sections 3.3 and 5.10, the Option shall become
exercisable in such amounts and at such times as are set forth in Exhibit A
hereto.

            (b) No portion of the Option which has not become exercisable at
Termination of Service shall thereafter become exercisable, except as may be
otherwise provided by the Committee or as set forth in a written agreement
between the Company and the Optionee [FOR EXECUTIVE OFFICERS ONLY:, including,
without limitation, the Employment Agreement].

            3.2 Duration of Exercisability. The installments provided for in
Section 3.1(a) and Exhibit A hereto are cumulative. Each such installment which
becomes exercisable pursuant to Section 3.1 shall remain exercisable until it
becomes unexercisable under Section 3.3.

            3.3 Expiration of Option. The Option may not be exercised to any
extent by anyone after the first to occur of the following events:

            (a) The expiration of ten (10) years from the Grant Date; or

                                       3
<PAGE>

            (b) If this Option is designated as an Incentive Stock Option and
the Optionee owned (within the meaning of Section 424(d) of the Code), at the
time the Option was granted, more than ten percent (10%) of the total combined
voting power of all classes of stock of the Company or any Subsidiary or parent
corporation thereof (within the meaning of Section 422 of the Code), the
expiration of five years from the date the Option was granted; or

            (c) Except as set forth in a written agreement with the Company [FOR
EXECUTIVE OFFICERS ONLY: including, without limitation, the Employment
Agreement], the expiration of ninety (90) days following the date of the
Optionee's Termination of Service [FOR EXECUTIVE OFFICERS ONLY: (or, if later,
with respect to any portion of the Option that becomes exercisable pursuant to
Section 4(g)(iv) of the Employment Agreement, ninety (90) days following the
date such portion of the Option becomes exercisable)], unless, if the Optionee
is an Associate of the Company or any of its Subsidiaries, such Termination of
Service occurs by reason of the Optionee's discharge for Cause, or by reason of
the Optionee's death or Disability; or

            (d) The date of the Optionee's Termination of Service by reason of
the Optionee's discharge for Cause if Optionee is an Associate of the Company or
any of its Subsidiaries; or

            (e) The expiration of one year following the date of the Optionee's
Termination of Service by reason of the Optionee's death or Disability if the
Optionee is an Associate of the Company or any of its Subsidiaries.

            3.4 Special Tax Consequences. The Optionee acknowledges that, to the
extent that the aggregate Fair Market Value of stock with respect to which
Incentive Stock Options (but without regard to Section 422(d) of the Code),
including the Option, are exercisable for the first time by the Optionee during
any calendar year (under the Plan and all other incentive stock option plans of
the Company, any subsidiary corporation and any parent corporation thereof (each
within the meaning of Section 422 of the Code)) exceeds $100,000, the Option and
such other options shall be treated as not qualifying under Section 422 of the
Code but rather shall be taxed as Non-Qualified Stock Options. The Optionee
further acknowledges that the rule set forth in the preceding sentence shall be
applied by taking options into account in the order in which they were granted.
For purposes of these rules, the Fair Market Value of Stock shall be determined
as of the time the option with respect to such Stock is granted.

                                       4
<PAGE>

                                   ARTICLE IV

                               EXERCISE OF OPTION

            4.1 Person Eligible to Exercise. Except as provided in Sections
5.2(b) and 5.2(c), during the lifetime of the Optionee, only the Optionee may
exercise the Option or any portion thereof. After the death of the Optionee, any
exercisable portion of the Option may, prior to the time when the Option becomes
unexercisable under Section 3.3, be exercised by the Optionee's beneficiary
designated in accordance with Section 10.4 of the Plan. If no beneficiary has
been designated or survives the Optionee, the Option may be exercised by the
person entitled to such exercise pursuant to the Optionee's will or the laws of
descent and distribution.

            4.2 Partial Exercise. Any exercisable portion of the Option or the
entire Option, if then wholly exercisable, may be exercised in whole or in part
at any time prior to the time when the Option or portion thereof becomes
unexercisable under Section 3.3.

            4.3 Manner of Exercise. The Option, or any exercisable portion
thereof, may be exercised solely by delivery to the Secretary or the Secretary's
office of all of the following prior to the time when the Option or such portion
thereof becomes unexercisable under Section 3.3:

            (a) An Exercise Notice in writing signed by the Optionee or the
other person then entitled to exercise the Option or portion thereof, stating
that the Option or portion thereof is thereby exercised, such notice complying
with all applicable rules established by the Committee. Such notice shall be
substantially in the form attached as Exhibit B (or such other form as is
prescribed by the Committee); and

            (b) (i) Full payment (in cash or by check) for the shares with
      respect to which the Option or portion thereof is exercised, to the extent
      permitted under applicable laws; or

                  (ii) With the consent of the Committee, such payment may be
      made, in whole or in part, through the delivery of shares of Stock which
      have been owned by the Optionee for at least six months, duly endorsed for
      transfer to the Company with a Fair Market Value on the date of delivery
      equal to the aggregate exercise price of the Option or exercised portion
      thereof; or

                  (iii) To the extent permitted under applicable laws, through
      the delivery of a notice that the Optionee has placed a market sell order
      with a broker with respect to shares of Stock then issuable upon exercise
      of the Option, and that the broker has been directed to pay a sufficient
      portion of the net proceeds of the sale to the Company in satisfaction of
      the Option exercise price, provided, that payment of such proceeds is made
      to the Company upon settlement of such sale; or

                  (iv) With the consent of the Committee, any combination of the
      consideration provided in the foregoing subparagraphs (i), (ii) and (iii);
      and

                                       5
<PAGE>

            (c) A bona fide written representation and agreement, in such form
as is prescribed by the Committee, signed by the Optionee or other person then
entitled to exercise such Option or portion thereof, stating that the shares of
Stock are being acquired for the Optionee's own account, for investment and
without any present intention of distributing or reselling said shares or any of
them except as may be permitted under the Securities Act and then applicable
rules and regulations thereunder, and that the Optionee or other person then
entitled to exercise such Option or portion thereof will indemnify the Company
against and hold it free and harmless from any loss, damage, expense or
liability resulting to the Company if any sale or distribution of the shares by
such person is contrary to the representation and agreement referred to above.
The Committee may, in its absolute discretion, take whatever additional actions
it deems appropriate to ensure the observance and performance of such
representation and agreement and to effect compliance with the Securities Act
and any other federal or state securities laws or regulations. Without limiting
the generality of the foregoing, the Committee may require an opinion of counsel
acceptable to it to the effect that any subsequent transfer of shares acquired
on an Option exercise does not violate the Securities Act, and may issue
stop-transfer orders covering such shares. Share certificates evidencing Stock
issued on exercise of the Option shall bear an appropriate legend referring to
the provisions of this subsection (c) and the agreements herein. The written
representation and agreement referred to in the first sentence of this
subsection (c) shall, however, not be required if the shares to be issued
pursuant to such exercise have been registered under the Securities Act, and
such registration is then effective in respect of such shares; and

            (d) Full payment to the Company (or other employer corporation) of
all amounts which, under federal, state or local tax law, it is required to
withhold upon exercise of the Option. With the consent of the Committee, (i)
shares of Stock owned by the Optionee for at least six months duly endorsed for
transfer or (ii) shares of Stock issuable to the Optionee upon exercise of the
Option, having a Fair Market Value at the date of Option exercise equal to the
statutory minimum sums required to be withheld, may be used to make all or part
of such payment; and

            (e) In the event the Option or portion thereof shall be exercised
pursuant to Section 4.1 by any person or persons other than the Optionee,
appropriate proof of the right of such person or persons to exercise the Option.

            4.4 Conditions to Issuance of Stock Certificates. The shares of
Stock deliverable upon the exercise of the Option, or any portion thereof, may
be either previously authorized but unissued shares or issued shares which have
then been reacquired by the Company. Such shares shall be fully paid and
nonassessable. The Company shall not be required to issue or deliver any
certificate or certificates for shares of Stock purchased upon the exercise of
the Option or portion thereof prior to fulfillment of all of the following
conditions:

            (a) The admission of such shares to listing on all stock exchanges
on which such Stock is then listed; and

            (b) The completion of any registration or other qualification of
such shares under any state or federal law or under rulings or regulations of
the Securities and Exchange

                                       6
<PAGE>

Commission or of any other governmental regulatory body, which the Committee
shall, in its absolute discretion, deem necessary or advisable; and

            (c) The obtaining of any approval or other clearance from any state
or federal governmental agency which the Committee shall, in its absolute
discretion, determine to be necessary or advisable; and

            (d) The receipt by the Company of full payment for such shares,
including payment of all amounts which, under federal, state or local tax law,
the Company (or other employer corporation) is required to withhold upon
exercise of the Option; and

            (e) The lapse of such reasonable period of time following the
exercise of the Option as the Committee may from time to time establish for
reasons of administrative convenience.

            4.5 Rights as Stockholder. The holder of the Option shall not be,
nor have any of the rights or privileges of, a stockholder of the Company in
respect of any shares purchasable upon the exercise of any part of the Option
unless and until certificates representing such shares shall have been issued by
the Company to such holder.

                                    ARTICLE V

                                OTHER PROVISIONS

            5.1 Administration. The Committee shall have the power to interpret
the Plan and this Agreement and to adopt such rules for the administration,
interpretation and application of the Plan as are consistent therewith and to
interpret, amend or revoke any such rules. All actions taken and all
interpretations and determinations made by the Committee in good faith shall be
final and binding upon the Optionee, the Company and all other interested
persons. No member of the Committee shall be personally liable for any action,
determination or interpretation made in good faith with respect to the Plan,
this Agreement or the Option. In its absolute discretion, the Board may at any
time and from time to time exercise any and all rights and duties of the
Committee under the Plan and this Agreement.

            5.2 Option Not Transferable.

            (a) Subject to Section 5.2(b), the Option may not be sold, pledged,
assigned or transferred in any manner other than by will or the laws of descent
and distribution unless and until the Option has been exercised, or the shares
underlying such Option have been issued, and all restrictions applicable to such
shares have lapsed. Neither the Option nor any interest or right therein shall
be liable for the debts, contracts or engagements of the Optionee or his or her
successors in interest or shall be subject to disposition by transfer,
alienation, anticipation, pledge, encumbrance, assignment or any other means
whether such disposition be voluntary or involuntary or by operation of law by
judgment, levy, attachment, garnishment or any other legal or equitable
proceedings (including bankruptcy), and any attempted disposition thereof shall
be null and void and of no effect, except to the extent that such disposition is
permitted by the preceding sentence.

                                       7
<PAGE>

            (b) Notwithstanding any other provision in this Agreement, with the
consent of the Committee and to the extent the Option is not intended to qualify
as an Incentive Stock Option, the Option may be transferred to, and exercised by
and paid to certain persons or entities related to the Optionee, including but
not limited to members of the Optionee's family, charitable institutes or trusts
or other entities whose beneficiaries or beneficial owners are members of the
Optionee's family or to such other persons or entities as may be expressly
approved by the Committee (each a "Permitted Transferee"), pursuant to such
conditions and procedures as the Committee may require.

            (c) Unless transferred to a Permitted Transferee in accordance with
Section 5.2(b), during the lifetime of the Optionee, only the Optionee may
exercise the Option (or any portion thereof). Subject to such conditions and
procedures as the Committee may require, a Permitted Transferee may exercise the
Option or any portion thereof during the Optionee's lifetime. After the death of
the Optionee, any exercisable portion of the Option may, prior to the time when
the Option portion becomes unexercisable under Section 3.3, be exercised by the
Optionee's beneficiary designated in accordance with Section 10.4 of the Plan.
If no beneficiary has been designated or survives the Optionee, the Option may
be exercised by the person entitled to such exercise pursuant to the Optionee's
will or the laws of descent and distribution.

            5.3 Restrictive Legends and Stop-Transfer Orders.

            (a) The share certificate or certificates evidencing the shares of
Stock purchased hereunder shall be endorsed with any legends that may be
required by state or federal securities laws.

            (b) The Optionee agrees that, in order to ensure compliance with the
restrictions referred to herein, the Company may issue appropriate "stop
transfer" instructions to its transfer agent, if any, and that, if the Company
transfers its own securities, it may make appropriate notations to the same
effect in its own records.

            (c) The Company shall not be required: (i) to transfer on its books
any shares of Stock that have been sold or otherwise transferred in violation of
any of the provisions of this Agreement, or (ii) to treat as owner of such
shares of Stock or to accord the right to vote or pay dividends to any purchaser
or other transferee to whom such shares shall have been so transferred.

            5.4 Shares to Be Reserved. The Company shall at all times during the
term of the Option reserve and keep available such number of shares of Stock as
will be sufficient to satisfy the requirements of this Agreement.

            5.5 Notices. Any notice to be given under the terms of this
Agreement to the Company shall be addressed to the Company in care of the
Secretary, and any notice to be given to the Optionee shall be addressed to the
Optionee at the address given beneath the Optionee's signature hereto. By a
notice given pursuant to this Section 5.5, either party may hereafter designate
a different address for notices to be given to that party. Any notice which is
required to be given to the Optionee shall, if the Optionee is then deceased, be
given to the Optionee's designated beneficiary, if any, or the person otherwise
entitled to exercise his or her Option pursuant to Section 4.1 by written notice
under this Section 5.5. Any notice shall be deemed

                                       8
<PAGE>

duly given when sent via email or enclosed in a properly sealed envelope or
wrapper addressed as aforesaid and deposited (with postage prepaid) in a post
office or branch post office regularly maintained by the United States Postal
Service.

            5.6 Titles. Titles are provided herein for convenience only and are
not to serve as a basis for interpretation or construction of this Agreement.

            5.7 Stockholder Approval. The Plan will be submitted for approval by
the Company's stockholders within 12 months after the date the Plan was
initially adopted by the Board. The Option may not be exercised to any extent by
anyone prior to the time when the Plan is approved by the stockholders, and if
such approval has not been obtained by the end of said 12 month period, the
Option shall thereupon be canceled and become null and void.

            5.8 Notification of Disposition. If this Option is designated as an
Incentive Stock Option, the Optionee shall give prompt notice to the Company of
any disposition or other transfer of any shares of stock acquired under this
Agreement if such disposition or transfer is made (a) within two years from the
Grant Date with respect to such shares or (b) within one year after the transfer
of such shares to him. Such notice shall specify the date of such disposition or
other transfer and the amount realized, in cash, other property, assumption of
indebtedness or other consideration, by the Optionee in such disposition or
other transfer.

            5.9 Construction. This Agreement shall be administered, interpreted
and enforced under the laws of the State of California without regard to
conflicts of laws thereof.

            5.10 Conformity to Securities Laws. The Optionee acknowledges that
the Plan is intended to conform to the extent necessary with all provisions of
the Securities Act and the Exchange Act and any and all regulations and rules
promulgated by the Securities and Exchange Commission thereunder, and state
securities laws and regulations. Notwithstanding anything herein to the
contrary, the Plan shall be administered, and the Option is granted and may be
exercised, only in such a manner as to conform to such laws, rules and
regulations. To the extent permitted by applicable law, the Plan and this
Agreement shall be deemed amended to the extent necessary to conform to such
laws, rules and regulations.

            5.11 Amendments. This Agreement may not be modified, amended or
terminated except by an instrument in writing, signed by the Optionee or such
other person as may be permitted to exercise the Option pursuant to Section 4.1
and by a duly authorized representative of the Company.

                            (signature page follows)

                                       9
<PAGE>

            IN WITNESS WHEREOF, this Agreement has been executed and delivered
by the parties hereto.

                                              CANCERVAX CORPORATION

                                              By:__________________________

__________________________________
            Optionee Name

__________________________________

__________________________________
              Address

Optionee's Social Security Number:

__________________________________

                                       10
<PAGE>

                                    EXHIBIT A

                             STOCK OPTION AGREEMENT

                           dated _____________, _____,
                                 by and between
                              CancerVax Corporation
                            and _____________________
                                (the "Agreement")

Optionee's Name: __________________________________________

Optionee's Address: _____________________________________

                 __________________________________________

Optionee's Social Security Number: ______________________

Type of Option (check one):

            [ ]   Incentive Stock Option

            [ ]   Non-Qualified Stock Option

Date of Grant:___________________________________________

            1. Pursuant to Section 2.1 of the Agreement, the Company grants an
option to purchase any part or all of an aggregate of _____________ shares of
Stock ("Option Shares") at a price per share of $_______ upon the terms and
conditions set forth in the Agreement.

            2. In accordance with Section 3.1(a) of the Agreement, the Option
shall become exercisable in cumulative installments, rounded down to the nearest
whole number of shares, as follows:

            (a) One-third (1/3) of the Option Shares will vest upon the
      successful completion of all conformance lots required for submission of a
      Biologics License Application for Canvaxin(TM), subject to Optionee's
      continued employment or service with the Company or its Subsidiaries on
      such date; and

            (b) Two-thirds (2/3) of the Option Shares will vest upon the
      approval of a BLA or equivalent marketing authorization for Canvaxin(TM)
      in the United States or the European Union, subject to Optionee's
      continued employment or service with the Company or its Subsidiaries on
      such date.

            3. Capitalized terms not otherwise defined herein shall have the
meanings assigned thereto in the Agreement.

                                       A-1
<PAGE>

                                    EXHIBIT B

                             FORM OF EXERCISE NOTICE

CancerVax Corporation
Attention: Corporate Secretary

            Re:   Exercise of Stock Option

Ladies and Gentlemen:

      1. Exercise of Option. The undersigned Optionee, _______________________,
was granted an option (the "Option") to purchase shares of the Common Stock, par
value $0.00004 per share ("Common Stock"), of CancerVax Corporation, a Delaware
corporation (the "Company"), effective as of ____________, pursuant to the Stock
Option Agreement, dated ________________ (the "Option Agreement"). The
undersigned hereby elects to exercise the Option as follows:

            (a)   The undersigned hereby elects to exercise the Option as to
                  ___________ shares of the Common Stock, in accordance with
                  Section 3.1 of the Option Agreement (the "Shares").

            (b)   This date of this exercise is _________ __, ____.

      2. Payment. The undersigned has enclosed herewith __________ (representing
full payment for such Shares in accordance with Section 4.3 of the Option
Agreement). The undersigned authorizes payroll withholding and otherwise will
make adequate provision for the tax withholding obligations of the Company, if
any, with respect to such exercise.

      3. Binding Effect. The undersigned agrees that the Shares are being
acquired in accordance with and subject to the terms, provisions and conditions
of the Option Agreement set forth therein, to all of which the undersigned
hereby expressly assent. This Agreement shall inure to the benefit of and be
binding upon the heirs, executors, administrators, successors and assigns of the
undersigned.

            The undersigned understands that she is purchasing the Shares
pursuant to the terms of the Option Agreement, a copy of which the undersigned
has received and carefully read and understands.

                                        __________________________________

Receipt of the above is hereby acknowledged

CANCERVAX CORPORATION,
a Delaware corporation

By:_____________________________

Title:__________________________

                                       B-1

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