Document:

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                                                                    Exhibit 4.03

THE SECURITIES EVIDENCED BY THIS WARRANT HAVE NOT BEEN REGISTERED UNDER THE
SECURITIES ACT OF 1933, AS AMENDED OR APPLICABLE STATE SECURITIES LAWS, AND NO
INTEREST MAY BE SOLD, DISTRIBUTED, ASSIGNED, OFFERED, PLEDGED OR OTHERWISE
TRANSFERRED UNLESS (A) THERE IS AN EFFECTIVE REGISTRATION STATEMENT UNDER SUCH
ACT AND APPLICABLE STATE SECURITIES LAWS COVERING ANY SUCH TRANSACTION INVOLVING
SAID SECURITIES, (B) THE COMPANY RECEIVES AN OPINION OF LEGAL COUNSEL FOR THE
HOLDER OF THE SECURITIES SATISFACTORY TO THE COMPANY STATING THAT SUCH
TRANSACTION IS EXEMPT FROM REGISTRATION, OR (C) THE COMPANY OTHERWISE SATISFIES
ITSELF THAT SUCH TRANSACTION IS EXEMPT FROM REGISTRATION.

No. W-                                                       WARRANT TO PURCHASE
ISSUED:                                                      VENDOR PREFERRED
Void After                                                   STOCK, SERIES 1

                              CANCERVAX CORPORATION

                    VENDOR PREFERRED STOCK, SERIES 1, WARRANT

         THIS IS TO CERTIFY that, for value received and subject to these terms
and conditions, _________________, or such person to whom this Warrant is
transferred (the "HOLDER"), is entitled to exercise this Warrant to purchase
___________(_____) fully paid and nonassessable shares of CancerVax Corporation,
a Delaware corporation (the "COMPANY"), $0.00004 par value per share, Vendor
Preferred Stock, Series 1 (the "WARRANT STOCK") at a price per share equal to
Two Dollars and Forty-Five Cents ($2.45; the "EXERCISE PRICE") (such number of
shares, type of security and the Exercise Price being subject to adjustment as
provided below).

1.       METHOD OF EXERCISE

         1.1      CASH EXERCISE RIGHT

         This Warrant may be exercised by the Holder, at any time after the date
of issuance, but not later than the first to occur of (a) the seventh
anniversary of the date of issuance of this Warrant or (b) the third anniversary
of the closing of a firmly underwritten public offering of the Company's Common
Stock pursuant to a registration statement under the Securities Act of 1933, as
amended (the "EXERCISE

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         PERIOD"), in whole or in part, by delivering to the Company at 5931
Darwin Court, Carlsbad, California 92008 (or such other office or agency of the
Company as it may designate by notice in writing to the Holder at the address of
the Holder appearing on the books of the Company) (i) this Warrant certificate,
(ii) a certified or cashier's check payable to the Company, or canceled
indebtedness of the Company to the Holder, in the amount of the Exercise Price
multiplied by the number of shares for which this Warrant is being exercised
(the "PURCHASE PRICE"), and (iii) the Notice of Cash Exercise attached as
EXHIBIT A duly completed and executed by the Holder. Upon exercise, the Holder
shall be entitled to receive from the Company a stock certificate in proper form
representing the number of shares of Warrant Stock purchased.

         1.2      NET ISSUANCE RIGHT

         Notwithstanding the payment provisions set forth above, the Holder may
elect to convert this Warrant into shares of Warrant Stock (as defined above) by
surrendering this Warrant at the office of the Company at the address set forth
in Section 1.1 and delivering to the Company the Notice of Net Issuance Exercise
attached as EXHIBIT B duly completed and executed by the Holder, in which case
the Company shall issue to the Holder the number of shares of Warrant Stock of
the Company equal to the result obtained by (a) subtracting B from A, (b)
multiplying the difference by C, and (c) dividing the product by A as set forth
in the following equation:

X = [(A - B) x C] where:
    -------------
          A
                  X  =     the number of shares of Warrant Stock issuable upon
                           net issuance exercise pursuant to the provisions of
                           this Section 1.2.

                  A  =     the fair market value of one share of Warrant Stock
                           on the date of net issuance exercise.

                  B  =     the Exercise Price for one share of Warrant Stock
                           under this Warrant.

                  C  =     the number of shares of Warrant Stock as to which
                           this Warrant is exercisable pursuant to the
                           provisions of Section 1.1.

         If the foregoing calculation results in a negative number, then no
shares of Warrant Stock shall be issued upon net issuance exercise pursuant to
this Section 1.2.

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         For purposes of the above calculation, fair market value of one share
of Warrant Stock shall be determined by the Company's Board of Directors in good
faith; provided, however, that where there exists a public market for the
Company's Common Stock at the time of such exercise, the fair market value per
share shall be the product of (i) the average of the closing bid and asked
prices of the Common Stock quoted in the Over-The-Counter Market Summary or the
last reported sale price of the Common Stock or the closing price quoted on the
Nasdaq National Market or on any exchange on which the Common Stock is listed,
whichever is applicable, as published in the (Western Edition of The Wall Street
Journal) for the five (5) trading days prior to the date of determination of
fair market value and (ii) the number of shares of Common Stock into which each
share of Warrant Stock is convertible, if applicable, at the time of such
exercise. Notwithstanding the foregoing, in the event the Warrant is exercised
in connection with the Company's initial public offering of Common Stock, the
fair market value per share shall be the product of (A) the per share offering
price to the public of the Company's initial public offering, and (B) the number
of shares of Common Stock into which each share of Warrant Stock is convertible,
if applicable, at the time of such exercise.

         Upon net issuance exercise in accordance with this Section 1.2, the
Holder shall be entitled to receive from the Company a stock certificate in
proper form representing the number of shares of Warrant Stock determined in
accordance with the foregoing.

2.       DELIVERY OF STOCK CERTIFICATES; NO FRACTIONAL SHARES

         2.1      Promptly after the payment of the Purchase Price following the
exercise of this Warrant (in whole or in part) or after notice of net issuance
exercise and compliance with Section 1.2, the Company at its expense shall issue
in the name of and deliver to the Holder (a) a certificate or certificates for
the number of fully paid and nonassessable shares of Warrant Stock to which the
Holder shall be entitled upon such exercise, and (b) a new Warrant of like tenor
to purchase up to that number of shares of Warrant Stock, if any, as to which
this Warrant has not been exercised if this Warrant has not expired. The Holder
shall for all purposes be deemed to have become the holder of record of such
shares of Warrant Stock on the date this Warrant was exercised (the date the
Holder has fully complied with the requirements of Section 1.1 or 1.2),
irrespective of the date of delivery of the certificate or certificates
representing the Warrant Stock; provided that, if the date such exercise is made
is a date when the stock transfer books of the Company are closed, such person
shall be deemed to have become the holder of record of such shares of Warrant
Stock at the close of business on the next succeeding date on which the stock
transfer books are open.

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         2.2      No fractional shares shall be issued upon the exercise of this
Warrant. In lieu of fractional shares, the Company shall pay the Holder a sum in
cash equal to such fraction multiplied by the Exercise Price.

3.       COVENANTS AS TO WARRANT STOCK

         The Company covenants that at all times during the Exercise Period
there shall be reserved for issuance and delivery upon exercise of this Warrant
such number of shares of Warrant Stock as is necessary for exercise in full of
this Warrant and, from time to time, it will take all steps necessary to amend
its Certificate of Incorporation to provide sufficient reserves of shares of
Warrant Stock. The Company covenants that during the period this Warrant and the
Warrant Stock are outstanding, there shall be reserved for issuance and delivery
upon conversion of the Warrant Stock such number of shares of Common Stock as is
necessary for conversion in full of the Warrant Stock and, from time to time, it
will take all steps necessary to amend its Certificate of Incorporation to
provide sufficient reserves of shares of Common Stock. All shares of Warrant
Stock issued pursuant to the exercise of this Warrant and all shares of Common
Stock issuable upon conversion of the Warrant Stock will, upon their issuance,
be validly issued and outstanding, fully paid and nonassessable, free and clear
of all liens and other encumbrances or restrictions on sale and free and clear
of all preemptive rights, except restrictions arising (a) under federal and
state securities laws, (b) not by or through the Company, or (c) by agreement
between the Company and the Holder or its successors.

4.       ADJUSTMENTS; TERMINATION OF WARRANT UPON CERTAIN EVENTS

         4.1      EFFECT OF REORGANIZATION

         Upon a merger, consolidation, acquisition of all or substantially all
of the property or stock, liquidation or other reorganization of the Company
(collectively, a "REORGANIZATION") during the Exercise Period, the Holder shall
be given notice of such proposed action as provided in Section 8. The Holder
shall be so notified in writing by the Company by registered or certified mail
at least ten (10) days before the effectiveness of such Reorganization.
Notwithstanding the period of exercisability stated on the face of this Warrant,
this Warrant shall become forever null and void to the extent not exercised at
least two (2) business days before the effectiveness of such Reorganization;
provided, however, that to the extent that this Warrant has not previously been
exercised, it shall automatically be deemed exercised, without further action by
the Holder, immediately prior to its expiration, but subject to the subsequent
closing of the Reorganization.

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         4.2      ADJUSTMENTS FOR STOCK SPLITS, DIVIDENDS

         If the Company shall issue any shares of the same class as the Warrant
Stock as a stock dividend or subdivide the number of outstanding shares of such
class into a greater number of shares, then, in either such case, the Exercise
Price in effect before such dividend or subdivision shall be proportionately
reduced and the number of shares of Warrant Stock at that time issuable pursuant
to the exercise of this Warrant shall be proportionately increased; and,
conversely, if the Company shall contract the number of outstanding shares of
the same class as the Warrant Stock by combining such shares into a smaller
number of shares, then the Exercise Price in effect before such combination
shall be proportionately increased and the number of shares of Warrant Stock at
that time issuable pursuant to the exercise or conversion of this Warrant shall
be proportionately decreased. Each adjustment in the number of shares of Warrant
Stock issuable shall be to the nearest whole share.

         4.3      AUTOMATIC CONVERSION OF WARRANT STOCK

         In the event the Warrant Stock is automatically converted into Common
Stock pursuant to the terms of the Company's Certificate of Incorporation
(including any Certificate of Designation adopted thereunder), then this Warrant
shall be exercisable for that number of shares of Common Stock into which the
shares of Warrant Stock then subject to this Warrant could be converted on the
date of automatic conversion, and the Exercise Price shall be appropriately
adjusted so that the aggregate Exercise Price remains the same. Thereafter, for
purposes of this Warrant, the Warrant Stock shall be deemed to be the Common
Stock of the Company. Each adjustment in the number of shares of Warrant Stock
issuable shall be to the nearest whole share and shall be determined by
multiplying the number of shares of Warrant Stock purchasable immediately prior
to such adjustment in the Exercise Price by a fraction, the numerator of which
shall be the Exercise Price immediately prior to such adjustment and the
denominator of which shall be the Exercise Price immediately thereafter.

         4.4      CERTIFICATE AS TO ADJUSTMENTS

         In the case of any adjustment in the Exercise Price or number and type
of securities issuable upon exercise of this Warrant under Section 4.2 or 4.3,
the Company will promptly give written notice to the Holder in the form of a
certificate, certified and confirmed by an officer of the Company, setting forth
the adjustment in reasonable detail.

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5.       SECURITIES LAWS RESTRICTIONS; LEGEND ON WARRANT STOCK

         5.1      This Warrant and the securities issuable upon exercise have
not been registered under the Securities Act of 1933, as amended or applicable
state securities laws, and no interest may be sold, distributed, assigned,
offered, pledged or otherwise transferred unless (a) there is an effective
registration statement under such Act and applicable state securities laws
covering any such transaction involving said securities, (b) the Company
receives an opinion of legal counsel for the holder of the securities
satisfactory to the Company stating that such transaction is exempt from
registration, or (c) the Company otherwise satisfies itself that such
transaction is exempt from registration.

         5.2      A legend setting forth or referring to the above restrictions
shall be placed on this Warrant, any replacement and any certificate
representing the Warrant Stock, and a stop transfer order shall be placed on the
books of the Company and with any transfer agent until such securities may be
legally sold or otherwise transferred.

6.       MARKET STANDOFF

         In connection with a public offering of the Company's securities and
upon request of the Company or the underwriters managing such offering of the
Company's securities (which request may be delivered by the Company if the
Company is so requested by such underwriters), Holder agrees not to sell, make
any short sale of, loan, grant any option for the purchase of, or otherwise
dispose of any securities of the Company (other than those included in the
registration or acquired without restriction under federal securities laws)
without the prior written consent of the Company or such underwriters for such
period of time beginning on the date Holder is notified in writing by the
Company that the Company proposes to file a Registration Statement under the
Securities Act of 1933, as amended and ending on the date specified by the
representative of the underwriters of the Company's Common Stock, not to exceed
(a) 180 days following the effective date of such registration pertaining to the
Company's initial public offering, or (b) 90 days following the effective date
of a subsequent registration; provided, however, that in each case, all
executive officers and directors of the Company then holding securities of the
Company, and each stockholder of the Company holding in the aggregate at least
1% of the total equity of the Company, enter into similar agreements.

         In order to enforce the foregoing covenants, the Company shall have the
right to place restrictive legends on the certificates representing the
securities of Holder and may impose stop-transfer instructions with respect to
the securities of Holder. Holder further agrees to enter into any agreement
reasonably required by the underwriters to implement the foregoing within any
reasonable timeframe so requested.

<PAGE>

7.       LOST OR DAMAGED WARRANT CERTIFICATE

         Upon receipt by the Company of satisfactory evidence of the loss,
theft, destruction or damage of this Warrant and either (in the case of loss,
theft or destruction) reasonable indemnification or (in the case of damage) the
surrender of this Warrant for cancellation, the Company will execute and deliver
to the Holder, without charge, a new Warrant of like denomination.

8.       NOTICES OF RECORD DATE, ETC.

         Upon any event as to which the Company is required to give notice to
any holders of Warrant Stock, the Company will mail to the Holder a notice
specifying (i) the date on which any record of the holders of Warrant Stock is
to be taken, (ii) the date on which any reorganization, reclassification,
recapitalization, transfer, consolidation, merger, dissolution, liquidation or
winding-up, if applicable, is to take place, and the time, if any is to be
fixed, as to which the holders of record of Warrant Stock or securities into
which the Warrant Stock is convertible shall be entitled to exchange their
shares for securities or other property deliverable on such reorganization,
reclassification, recapitalization, transfer, consolidation, merger,
dissolution, liquidation or winding-up, (iii) the amount and character of any
stock or other securities, or rights or warrants, proposed to be issued or
granted, the date of such proposed issue or grant and the persons or class of
persons to whom such proposed issue or grant is to be offered or made, and (iv)
in reasonable detail, the facts, including the proposed date, concerning any
other such event. Such notice shall be delivered to the Holder at least ten (10)
days prior to the effective date of the transaction specified in the notice.

9.       INVESTMENT INTENT

         By accepting this Warrant, the Holder represents that it is acquiring
this Warrant for investment and not with a view to, or for sale in connection
with, any distribution thereof.

10.      MISCELLANEOUS

         10.1     HOLDER AS OWNER

         The Company may deem and treat the holder of record of this Warrant
(including any permitted transferees) as the absolute owner for all purposes
regardless of any notice to the contrary.

<PAGE>

         10.2     NO STOCKHOLDER RIGHTS

         This Warrant shall not entitle the Holder to any voting rights or any
other rights as a stockholder of the Company or to any other rights except the
rights stated herein; and no dividend or interest shall be payable or shall
accrue in respect of this Warrant or the Warrant Stock, until this Warrant is
exercised; provided, further, that any dividends or interest on the Warrant
Stock shall only accrue to the extent provided for in the rights, preferences
and privileges of the Warrant Stock.

         10.3     NOTICES

         Unless otherwise provided, any notice under this Warrant shall be given
in writing and shall be deemed effectively given (a) upon personal delivery to
the party to be notified, (b) upon confirmation of receipt by fax by the party
to be notified, (c) one business day after deposit with a reputable overnight
courier, prepaid for overnight delivery and addressed as set forth in (d), or
(d) three (3) days after deposit with the United States Post Office, postage
prepaid, registered or certified with return receipt requested and addressed to
the party to be notified at the address indicated below, or at such other
address as such party may designate by 10 days' advance written notice to the
other party given in the foregoing manner.

         If to the Holder:

                           To the address last furnished
                           in writing to the Company by
                           the Holder

         If to the Company:

                           CancerVax Corporation
                           5931 Darwin Court,
                           Carlsbad, California 92008
                           Attn: General Counsel

         10.4     AMENDMENTS AND WAIVERS

         Any term of this Warrant may be amended and the observance of any term
may be waived (either generally or in a particular instance and either
retroactively or prospectively) only with the written consent of the Company and
the Holder. Any amendment or waiver effected in accordance with this Section
10.4 shall be binding on each future Holder and the Company.

<PAGE>

         10.5     GOVERNING LAW; JURISDICTION; VENUE

         This Warrant shall be governed by and construed under the laws of the
state of Delaware without regard to principles of conflict of laws. The parties
irrevocably consent to the jurisdiction and venue of the state and federal
courts located in San Diego, California in connection with any action relating
to this Warrant.

         10.6     SUCCESSORS AND ASSIGNS; TRANSFER

         The terms and conditions of this Warrant shall inure to the benefit of
and be binding on the respective successors and assigns of the parties. This
Warrant may not be transferred or assigned without the prior written consent of
the Company, which may be given or withheld in its absolute discretion.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK.]

<PAGE>

         IN WITNESS WHEREOF, the Company has executed this Warrant as of the
date first written above.

                                           CANCERVAX CORPORATION

                                           By: _________________________________
                                           Name:  David F. Hale
                                           Title: President and CEO

            [SIGNATURE PAGE VENDOR PREFERRED SERIES 1, WARRANT NO.__]

<PAGE>

                             NOTICE OF CASH EXERCISE

To: CancerVax Corporation

         The undersigned hereby irrevocably elects to purchase ___________
shares of Vendor Preferred Stock, Series 1of CancerVax Corporation (the
"COMPANY") issuable upon the exercise of the attached Warrant and requests that
certificates for such shares be issued in the name of and delivered to the
address of the undersigned, at the address stated below and, if said number of
shares shall not be all the shares that may be purchased pursuant to the
attached Warrant, that a new Warrant evidencing the right to purchase the
balance of such shares be registered in the name of, and delivered to, the
undersigned at the address stated below. The undersigned agrees with and
represents to the Company that said shares of the Vendor Preferred Stock, Series
1 of the Company are acquired for the account of the undersigned for investment
and not with a view to, or for sale in connection with, any distribution or
public offering within the meaning of the Securities Act of 1933, as amended.

         [Payment enclosed in the amount of $___________.]

         Dated: ________________

         Name of Holder of Warrant: ____________________________________________
                                                 (please print)

         Address: ______________________________________________________________

         Signature: ____________________________________________________________

<PAGE>

                         NOTICE OF NET ISSUANCE EXERCISE

To:      CancerVax Corporation

         The undersigned hereby irrevocably elects to convert the attached
Warrant into such number of shares of Vendor Preferred Stock, Series 1 of
CancerVax Corporation (the "COMPANY") as is determined pursuant to Section 1.2
of the attached Warrant. The undersigned requests that certificates for such net
issuance shares be issued in the name of and delivered to the address of the
undersigned, at the address stated below. The undersigned agrees with and
represents to the Company that said shares of Vendor Preferred Stock, Series 1
of the Company are acquired for the account of the undersigned for investment
and not with a view to, or for sale in connection with, any distribution or
public offering within the meaning of the Securities Act of 1933, as amended.

         Dated: ________________

         Name of Holder of Warrant: ____________________________________________
                                                 (please print)

         Address: ______________________________________________________________

         Signature: ____________________________________________________________

<PAGE>

                                   ASSIGNMENT

         Subject to the provisions of Section 10.6 of the attached Warrant, for
value received the undersigned sells, assigns and transfers to the transferee
named below the attached Warrant, together with all right, title and interest,
and does irrevocably constitute and appoint the transfer agent of CancerVax
Corporation (the "COMPANY") as the undersigned's attorney, to transfer said
Warrant on the books of the Company, with full power of substitution in the
premises.

         Dated: ________________

         Name of Holder of Warrant: ____________________________________________
                                                 (please print)

         Address: ______________________________________________________________

         Signature: ____________________________________________________________

         Name of transferee: ___________________________________________________
                                                  (please print)

         Address of transferee: ________________________________________________
<PAGE>

Schedule to Exhibit 4.03

The preceding form of Warrant to Purchase Vendor Preferred Stock, Series 1 of
the Company was issued to the following entities on the dates and in the amounts
listed below:

<TABLE>
<CAPTION>
  Warrant Number                         Holder                               Date Issued          Number of Shares
  --------------                         ------                               -----------          ----------------
<S>                       <C>                                             <C>                      <C>
        1                 General Electric Capital Corporation               July 11, 2001              21,105
        2                 General Electric Capital Corporation              August 10, 2001             17,884
        3                 General Electric Capital Corporation             November 1, 2001             15,020
        4                 General Electric Capital Corporation             December 20, 2001            11,297
        5                      Mallory Management Company                  February 5, 2002             75,000
        6                       M-Tech Therapeutics, Inc.                  February 1, 2003             150,000
</TABLE><PAGE>

                                                                    Exhibit 4.04

NEITHER THIS WARRANT NOR ANY OF THE SECURITIES ISSUABLE HEREUNDER HAVE BEEN
REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR APPLICABLE STATE
SECURITIES LAWS, AND NO INTEREST MAY BE SOLD, DISTRIBUTED, ASSIGNED, OFFERED,
PLEDGED OR OTHERWISE TRANSFERRED UNLESS (A) THERE IS AN EFFECTIVE REGISTRATION
STATEMENT UNDER SUCH ACT AND APPLICABLE STATE SECURITIES LAWS COVERING ANY SUCH
TRANSACTION INVOLVING SAID SECURITIES, (B) THE COMPANY RECEIVES AN OPINION OF
LEGAL COUNSEL FOR THE HOLDER OF THE SECURITIES SATISFACTORY TO THE COMPANY
STATING THAT SUCH TRANSACTION IS EXEMPT FROM REGISTRATION, OR (C) THE COMPANY
OTHERWISE SATISFIES ITSELF THAT SUCH TRANSACTION IS EXEMPT FROM REGISTRATION.

No. W-VP2-1                                                 WARRANT TO PURCHASE
ISSUED: September 6, 2002                                   VENDOR PREFERRED
Void After: June 30, 2013                                   STOCK, SERIES 2

                              CANCERVAX CORPORATION

                    VENDOR PREFERRED STOCK, SERIES 2, WARRANT

         THIS IS TO CERTIFY that, for value received and subject to these terms
and conditions, Venture Lending & Leasing III, LLC, or such person to whom this
Warrant is transferred (the "HOLDER"), is entitled to exercise this Warrant to
purchase ONE HUNDRED FIFTY-ONE THOUSAND SIX HUNDRED EIGHTY-FIVE (151,685) fully
paid and nonassessable shares of CancerVax Corporation, a Delaware corporation
(the "COMPANY"), $0.00004 par value per share, Vendor Preferred Stock, Series 2
(the "WARRANT STOCK") at a price per share equal to Two Dollars and Sixty-Seven
Cents ($2.67; the "EXERCISE PRICE") (such number of shares, type of security and
the Exercise Price being subject to adjustment as provided below).

1.       METHOD OF EXERCISE

         1.1      CASH EXERCISE RIGHT

         This Warrant may be exercised by the Holder, at any time after the date
of issuance, but not later than June 30, 2013 (the "EXERCISE PERIOD"), in whole
or in part, by delivering to the Company at 2110 Rutherford Road, Carlsbad,
California 92008 (or such other office or agency of the Company as it may
designate by notice in writing to the Holder at the address of the Holder
appearing on the books of the Company) (i) this Warrant certificate, (ii) a
certified or cashier's check payable to the Company, or canceled indebtedness of
the Company to the Holder, in the amount of the Exercise Price multiplied by the
number of shares for which this Warrant is being exercised (the "PURCHASE
PRICE"), and (iii) the Notice

                                       1

<PAGE>

of Cash Exercise attached as Exhibit "A" duly completed and executed by the
Holder. Upon exercise, the Holder shall be entitled to receive from the Company
a stock certificate in proper form representing the number of shares of Warrant
Stock purchased.

         1.2      NET ISSUANCE RIGHT

         Notwithstanding the payment provisions set forth above, the Holder may
elect to convert this Warrant into shares of Warrant Stock (as defined above) by
surrendering this Warrant at the office of the Company at the address set forth
in Section 1.1 and delivering to the Company the Notice of Net Issuance Exercise
attached as Exhibit "B" duly completed and executed by the Holder, in which case
the Company shall issue to the Holder the number of shares of Warrant Stock of
the Company equal to the result obtained by (a) subtracting B from A, (b)
multiplying the difference by C, and (c) dividing the product by A as set forth
in the following equation:

X = (A - B) x C where:
    -----------
         A

                  X   =    the number of shares of Warrant Stock issuable upon
                           net issuance exercise pursuant to the provisions of
                           this Section 1.2.

                  A   =    the fair market value of one share of Warrant Stock
                           on the date of net issuance exercise.

                  B   =    the Exercise Price for one share of Warrant Stock
                           under this Warrant.

                  C   =    the number of shares of Warrant Stock as to which
                           this Warrant is exercisable pursuant to the
                           provisions of Section 1.1.

         If the foregoing calculation results in a negative number, then no
shares of Warrant Stock shall be issued upon net issuance exercise pursuant to
this Section 1.2.

         For purposes of the above calculation, fair market value of one share
of Warrant Stock shall be determined by the Company's Board of Directors in good
faith; provided, however, that where there exists a public market for the
Company's Common Stock at the time of such exercise, the fair market value per
share shall be the product of (i) the average of the closing bid and asked
prices of the Common Stock quoted in the Over-The-Counter Market Summary or the
last reported sale price of the Common Stock or the closing price quoted on the
Nasdaq National Market or on any exchange on which the Common Stock is listed,
whichever is applicable, as published in the (Western Edition of The Wall Street
Journal) for the five (5) trading days prior to the date of determination of
fair market value and (ii) the number of shares of Common Stock into which each
share of Warrant Stock is convertible, if applicable, at the time of such
exercise. Notwithstanding the foregoing, in the event the Warrant is exercised
in connection with the Company's initial public offering of Common Stock, the
fair market value per share shall be the product of (A) the per share

                                       2

<PAGE>

offering price to the public of the Company's initial public offering, and (B)
the number of shares of Common Stock into which each share of Warrant Stock is
convertible, if applicable, at the time of such exercise.

         Upon net issuance exercise in accordance with this Section 1.2, the
Holder shall be entitled to receive from the Company a stock certificate in
proper form representing the number of shares of Warrant Stock determined in
accordance with the foregoing.

         1.3      REDUCTION IN NUMBER OF SHARES OF WARRANT STOCK

         In the event that Venture Lending and Leasing III, Inc. ("VLL3") fails
or refuses to make any Loan (as defined in the Loan Agreement) pursuant to
Section 4.2(f) of that certain Loan and Security Agreement, dated September __,
2002, by and between the Company and VLL3 (the "Loan Agreement") (A) the number
of shares that the Holder can purchase pursuant to this Warrant shall be reduced
proportionately based upon the percentage of VLL3's Commitment (as defined in
the Loan Agreement) that VLL3 fails to fund, or (B) if the Holder has exercised
this Warrant in full or in part for a number of shares in excess of the number
that would have been issuable under this Warrant after adjustment under clause
(A), then such excess number of shares, if any, issued to the Holder upon
exercise of this Warrant shall be redeemable by the Company for a period of 180
days after the date of such failure at a redemption price per share equal to the
Exercise Price that was in effect hereunder at the time of exercise with respect
to such excess shares.

2.       DELIVERY OF STOCK CERTIFICATES; NO FRACTIONAL SHARES

         2.1      Promptly after the payment of the Purchase Price following the
exercise of this Warrant (in whole or in part) or after notice of net issuance
exercise and compliance with Section 1.2, the Company at its expense shall issue
in the name of and deliver to the Holder (a) a certificate or certificates for
the number of fully paid and nonassessable shares of Warrant Stock to which the
Holder shall be entitled upon such exercise, and (b) a new Warrant of like tenor
to purchase up to that number of shares of Warrant Stock, if any, as to which
this Warrant has not been exercised if this Warrant has not expired. The Holder
shall for all purposes be deemed to have become the holder of record of such
shares of Warrant Stock on the date this Warrant was exercised (the date the
Holder has fully complied with the requirements of Section 1.1 or 1.2),
irrespective of the date of delivery of the certificate or certificates
representing the Warrant Stock; provided that, if the date such exercise is made
is a date when the stock transfer books of the Company are closed, such person
shall be deemed to have become the holder of record of such shares of Warrant
Stock at the close of business on the next succeeding date on which the stock
transfer books are open.

         2.2      No fractional shares shall be issued upon the exercise of this
Warrant. In lieu of fractional shares, the Company shall pay the Holder a sum in
cash equal to such fraction multiplied by the Exercise Price.

                                       3
<PAGE>

3.       COVENANTS AS TO WARRANT STOCK

         The Company covenants that at all times during the Exercise Period
there shall be reserved for issuance and delivery upon exercise of this Warrant
such number of shares of Warrant Stock as is necessary for exercise in full of
this Warrant and, from time to time, it will take all steps necessary to amend
its Certificate of Incorporation to provide sufficient reserves of shares of
Warrant Stock. The Company covenants that during the period this Warrant and the
Warrant Stock are outstanding, there shall be reserved for issuance and delivery
upon conversion of the Warrant Stock such number of shares of Common Stock as is
necessary for conversion in full of the Warrant Stock and, from time to time, it
will take all steps necessary to amend its Certificate of Incorporation to
provide sufficient reserves of shares of Common Stock. All shares of Warrant
Stock issued pursuant to the exercise of this Warrant and all shares of Common
Stock issuable upon conversion of the Warrant Stock will, upon their issuance,
be validly issued and outstanding, fully paid and nonassessable, free and clear
of all liens and other encumbrances or restrictions on sale and free and clear
of all preemptive rights, except restrictions arising (a) under federal and
state securities laws, (b) not by or through the Company, or (c) by agreement
between the Company and the Holder or its successors.

4.       ADJUSTMENTS; TERMINATION OF WARRANT UPON CERTAIN EVENTS

         4.1      EFFECT OF REORGANIZATION

         Upon a merger, consolidation, acquisition of all or substantially all
of the property or stock, liquidation or other reorganization of the Company
(collectively, a "REORGANIZATION") during the Exercise Period, the Holder shall
be given notice of such proposed action as provided in Section 8. The Holder
shall be so notified in writing by the Company by registered or certified mail
at least ten (10) days before the effectiveness of such Reorganization.
Notwithstanding the period of exercisability stated on the face of this Warrant,
this Warrant shall be deemed exercised in accordance with the provisions of
Section 1.2 hereof immediately prior to the effectiveness of such Reorganization
and thereafter shall become forever null and void.

         4.2      ADJUSTMENTS FOR STOCK SPLITS, DIVIDENDS

         If the Company shall issue any shares of the same class as the Warrant
Stock as a stock dividend or subdivide the number of outstanding shares of such
class into a greater number of shares, then, in either such case, the Exercise
Price in effect before such dividend or subdivision shall be proportionately
reduced and the number of shares of Warrant Stock at that time issuable pursuant
to the exercise of this Warrant shall be proportionately increased; and,
conversely, if the Company shall contract the number of outstanding shares of
the same class as the Warrant Stock by combining such shares into a smaller
number of shares, then the Exercise Price in effect before such combination
shall be proportionately increased and the number of shares of Warrant Stock at
that time issuable pursuant to the exercise or conversion of this Warrant shall
be proportionately decreased. Each adjustment in the number of shares of Warrant
Stock issuable shall be to the nearest whole share.

                                       4
<PAGE>

         4.3      AUTOMATIC CONVERSION OF WARRANT STOCK

         In the event the Warrant Stock is automatically converted into Common
Stock pursuant to the terms of the Company's Certificate of Incorporation
(including any Certificate of Designation adopted thereunder), then this Warrant
shall be exercisable for that number of shares of Common Stock into which the
shares of Warrant Stock then subject to this Warrant could be converted on the
date of automatic conversion, and the Exercise Price shall be appropriately
adjusted so that the aggregate Exercise Price remains the same. Thereafter, for
purposes of this Warrant, the Warrant Stock shall be deemed to be the Common
Stock of the Company. Each adjustment in the number of shares of Warrant Stock
issuable shall be to the nearest whole share and shall be determined by
multiplying the number of shares of Warrant Stock purchasable immediately prior
to such adjustment in the Exercise Price by a fraction, the numerator of which
shall be the Exercise Price immediately prior to such adjustment and the
denominator of which shall be the Exercise Price immediately thereafter.

         4.4      CERTIFICATE AS TO ADJUSTMENTS

         In the case of any adjustment in the Exercise Price or number and type
of securities issuable upon exercise of this Warrant under Section 4.2 or 4.3,
the Company will promptly give written notice to the Holder in the form of a
certificate, certified and confirmed by an officer of the Company, setting forth
the adjustment in reasonable detail.

5.       SECURITIES LAWS RESTRICTIONS; LEGEND ON WARRANT STOCK

         5.1      This Warrant and the securities issuable upon exercise have
not been registered under the Securities Act of 1933, as amended or applicable
state securities laws, and no interest may be sold, distributed, assigned,
offered, pledged or otherwise transferred unless (a) there is an effective
registration statement under such Act and applicable state securities laws
covering any such transaction involving said securities, (b) the Company
receives an opinion of legal counsel for the holder of the securities
satisfactory to the Company stating that such transaction is exempt from
registration, or (c) the Company otherwise satisfies itself that such
transaction is exempt from registration.

         5.2      A legend setting forth or referring to the above restrictions
shall be placed on this Warrant, any replacement and any certificate
representing the Warrant Stock, and a stop transfer order shall be placed on the
books of the Company and with any transfer agent until such securities may be
legally sold or otherwise transferred.

6.       MARKET STANDOFF

         In connection with a public offering of the Company's securities and
upon request of the Company or the underwriters managing such offering of the
Company's securities (which request may be delivered by the Company if the
Company is so requested by such underwriters), Holder agrees not to sell, make
any short sale of, loan, grant any option for the purchase of, or otherwise
dispose of any securities of the Company (other than those

                                       5
<PAGE>

included in the registration or acquired without restriction under federal
securities laws) without the prior written consent of the Company or such
underwriters for such period of time beginning on the date Holder is notified in
writing by the Company that the Company proposes to file a Registration
Statement under the Securities Act of 1933, as amended, and ending on the date
specified by the representative of the underwriters of the Company's Common
Stock, not to exceed (a) 180 days following the effective date of such
registration pertaining to the Company's initial public offering, or (b) 90 days
following the effective date of a subsequent registration; provided, however,
that in each case, all executive officers and directors of the Company then
holding securities of the Company, and each stockholder of the Company holding
in the aggregate at least 1% of the total equity of the Company, enter into
similar agreements.

         In order to enforce the foregoing covenants, the Company shall have the
right to place restrictive legends on the certificates representing the
securities of Holder and may impose stop-transfer instructions with respect to
the securities of Holder. Holder further agrees to enter into any agreement
reasonably required by the underwriters to implement the foregoing within any
reasonable timeframe so requested.

7.       LOST OR DAMAGED WARRANT CERTIFICATE

         Upon receipt by the Company of satisfactory evidence of the loss,
theft, destruction or damage of this Warrant and either (in the case of loss,
theft or destruction) reasonable indemnification or (in the case of damage) the
surrender of this Warrant for cancellation, the Company will execute and deliver
to the Holder, without charge, a new Warrant of like denomination.

8.       NOTICES OF RECORD DATE, ETC.

         Upon any event as to which the Company is required to give notice to
any holders of Warrant Stock, the Company will mail to the Holder a notice
specifying (i) the date on which any record of the holders of Warrant Stock is
to be taken, (ii) the date on which any reorganization, reclassification,
recapitalization, transfer, consolidation, merger, dissolution, liquidation or
winding-up, if applicable, is to take place, and the time, if any is to be
fixed, as to which the holders of record of Warrant Stock or securities into
which the Warrant Stock is convertible shall be entitled to exchange their
shares for securities or other property deliverable on such reorganization,
reclassification, recapitalization, transfer, consolidation, merger,
dissolution, liquidation or winding-up, (iii) the amount and character of any
stock or other securities, or rights or warrants, proposed to be issued or
granted, the date of such proposed issue or grant and the persons or class of
persons to whom such proposed issue or grant is to be offered or made, and (iv)
in reasonable detail, the facts, including the proposed date, concerning any
other such event. Such notice shall be delivered to the Holder at least ten (10)
days prior to the effective date of the transaction specified in the notice.

                                       6
<PAGE>

9.       INVESTMENT INTENT/ACCREDITED INVESTOR

         By accepting this Warrant, the Holder represents that it is acquiring
this Warrant for investment and not with a view to, or for sale in connection
with, any distribution thereof and that the Holder is an accredited investor as
defined in Rule 501(a) of Regulation D promulgated under the Securities Act of
1933, as amended.

10.      MISCELLANEOUS

         10.1     HOLDER AS OWNER

         The Company may deem and treat the holder of record of this Warrant
(including any permitted transferees) as the absolute owner for all purposes
regardless of any notice to the contrary.

         10.2     NO STOCKHOLDER RIGHTS

         This Warrant shall not entitle the Holder to any voting rights or any
other rights as a stockholder of the Company or to any other rights except the
rights stated herein; and no dividend or interest shall be payable or shall
accrue in respect of this Warrant or the Warrant Stock, until this Warrant is
exercised; provided, further, that any dividends or interest on the Warrant
Stock shall only accrue to the extent provided for in the rights, preferences
and privileges of the Warrant Stock.

         10.3     NOTICES

         Unless otherwise provided, any notice under this Warrant shall be given
in writing and shall be deemed effectively given (a) upon personal delivery to
the party to be notified, (b) upon confirmation of receipt by fax by the party
to be notified, (c) one business day after deposit with a reputable overnight
courier, prepaid for overnight delivery and addressed as set forth in (d), or
(d) three (3) days after deposit with the United States Post Office, postage
prepaid, registered or certified with return receipt requested and addressed to
the party to be notified at the address indicated below, or at such other
address as such party may designate by 10 days' advance written notice to the
other party given in the foregoing manner.

         If to the Holder:

                           Venture Lending & Leasing III, LLC
                           2010 North First Street, Suite 310
                           San Jose, CA 95131
                           Attn: Chief Financial Officer

                                       7
<PAGE>

         If to the Company:

                           CancerVax Corporation
                           2110 Rutherford Road
                           Carlsbad, California 92008
                           Attn: General Counsel

         10.4     AMENDMENTS AND WAIVERS

         Any term of this Warrant may be amended and the observance of any term
may be waived (either generally or in a particular instance and either
retroactively or prospectively) only with the written consent of the Company and
the Holder. Any amendment or waiver effected in accordance with this Section
10.4 shall be binding on each future Holder and the Company.

         10.5     GOVERNING LAW; JURISDICTION; VENUE

         This Warrant shall be governed by and construed under the laws of the
state of California without regard to principles of conflict of laws. The
parties irrevocably consent to the jurisdiction and venue of the state and
federal courts located in San Diego, California in connection with any action
relating to this Warrant.

         10.6     SUCCESSORS AND ASSIGNS; TRANSFER

         The terms and conditions of this Warrant shall inure to the benefit of
and be binding on the respective successors and assigns of the parties. This
Warrant may not be transferred or assigned without the prior written consent of
the Company, which may be given or withheld in its absolute discretion.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK.]

                                       8
<PAGE>

         IN WITNESS WHEREOF, the Company has executed this Warrant as of the
date first written above. CANCERVAX CORPORATION

                             By:               /s/ David F. Hale
                                 -----------------------------------------------
                                    Name:  David F. Hale
                                    Title: President and Chief Executive Officer

         [SIGNATURE PAGE VENDOR PREFERRED SERIES 2, WARRANT NO. W-VP2-1]

<PAGE>

                             NOTICE OF CASH EXERCISE

To : CancerVax Corporation

         The undersigned hereby irrevocably elects to purchase ___________
shares of Vendor Preferred Stock, Series 2 of CancerVax Corporation (the
"COMPANY") issuable upon the exercise of the attached Warrant and requests that
certificates for such shares be issued in the name of and delivered to the
address of the undersigned, at the address stated below and, if said number of
shares shall not be all the shares that may be purchased pursuant to the
attached Warrant, that a new Warrant evidencing the right to purchase the
balance of such shares be registered in the name of, and delivered to, the
undersigned at the address stated below. The undersigned agrees with and
represents to the Company that said shares of the Vendor Preferred Stock, Series
2 of the Company are acquired for the account of the undersigned for investment
and not with a view to, or for sale in connection with, any distribution or
public offering within the meaning of the Securities Act of 1933, as amended,
and that the undersigned is an accredited investor as defined in Rule 501(a) of
Regulation D promulgated under the Securities Act of 1933, as amended.

         [Payment enclosed in the amount of $___________.]

         Dated:  ________________

         Name of Holder of Warrant:_____________________________________________
                                                  (please print)

         Address:  _____________________________________________________________

         Signature:  ___________________________________________________________

<PAGE>

                         NOTICE OF NET ISSUANCE EXERCISE

To:      CancerVax Corporation

         The undersigned hereby irrevocably elects to convert the attached
Warrant into such number of shares of Vendor Preferred Stock, Series 2 of
CancerVax Corporation (the "COMPANY") as is determined pursuant to Section 1.2
of the attached Warrant. The undersigned requests that certificates for such net
issuance shares be issued in the name of and delivered to the address of the
undersigned, at the address stated below. The undersigned agrees with and
represents to the Company that said shares of Vendor Preferred Stock, Series 2
of the Company are acquired for the account of the undersigned for investment
and not with a view to, or for sale in connection with, any distribution or
public offering within the meaning of the Securities Act of 1933, as amended,
and that the undersigned is an accredited investor as defined in Rule 501(a) of
Regulation D promulgated under the Securities Act of 1933, as amended.

         Dated:  ________________

         Name of Holder of Warrant:_____________________________________________
                                                  (please print)

         Address:  _____________________________________________________________

         Signature:  ___________________________________________________________

<PAGE>

                                   ASSIGNMENT

         Subject to the provisions of Section 10.6 of the attached Warrant, for
value received the undersigned sells, assigns and transfers to the transferee
named below the attached Warrant, together with all right, title and interest,
and does irrevocably constitute and appoint the transfer agent of CancerVax
Corporation (the "COMPANY") as the undersigned's attorney, to transfer said
Warrant on the books of the Company, with full power of substitution in the
premises.

         Dated:  ________________

         Name of Holder of Warrant:_____________________________________________
                                                  (please print)

         Address:  _____________________________________________________________

         Signature:  ___________________________________________________________

         Name of transferee:____________________________________________________
                                                  (please print)

         Address of transferee:_________________________________________________

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