SUPERGEN INC
10-K, 1997-03-31
PHARMACEUTICAL PREPARATIONS
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                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------
 
                                   FORM 10-K
 
(MARK ONE)
 
/X/  ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE
     ACT OF 1934.
 
                    FOR THE FISCAL YEAR ENDED DECEMBER 31, 1996
 
                                       OR
 
/ /  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
     EXCHANGE ACT OF 1934.
 
       FOR THE TRANSITION PERIOD FROM                  TO
 
                          COMMISSION FILE NUMBER 0-21074
 
                                 SUPERGEN, INC.
 
             (Exact name of registrant as specified in its charter)
 
<TABLE>
<S>                              <C>
          CALIFORNIA                94-3132190
 (State or other jurisdiction     (IRS Employer
              of                  Identification
incorporation or organization)         No.)
</TABLE>
 
                TWO ANNABEL LANE, SUITE 220, SAN RAMON, CA 94583
              (Address of principal executive offices) (Zip Code)
 
       Registrant's telephone number, including area code: (510) 327-0200
                            ------------------------
 
        Securities registered pursuant to Section 12(b) of the Act: NONE
 
          Securities registered pursuant to Section 12(g) of the Act:
 
                    COMMON STOCK, $0.001 PAR VALUE PER SHARE
                         COMMON STOCK PURCHASE WARRANTS
 
                                (Title of Class)
 
    Indicate by check mark whether the Registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days. Yes __X__    No _____
 
    Indicate by check mark if disclosure of delinquent filers pursuant to Item
405 of Regulation S-K is not contained herein, and will not be contained, to the
best of Registrant's knowledge, in definitive proxy or information statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K. / /
 
    The aggregate market value of the voting stock held by non-affiliates of the
Registrant (based on the closing sale price the Common Stock as reported on the
Nasdaq National Market on March 25, 1997) was approximately $85,694,273. For
purposes of this determination, shares of Common Stock held by each officer and
director and by each person who owns 5% or more of the outstanding Common Stock
have been excluded in that such persons may be deemed to be affiliates of the
Registrant. This determination of affiliate status is not necessarily a
conclusive determination for other purposes. The number of outstanding shares of
the Registrant's Common Stock as of the close of business on March 25, 1997 was
16,952,292.
 
                      DOCUMENTS INCORPORATED BY REFERENCE
 
    Items 10, 11, 12 and 13 of Part III incorporate information by reference
from the definitive proxy statement for the Registrant's Annual Meeting of
Shareholders to be held on May 27, 1997.
 
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                                     PART I
 
ITEM 1.  BUSINESS.
 
    THIS "ITEM 1--BUSINESS" AND OTHER PARTS OF THIS REPORT CONTAIN
FORWARD-LOOKING STATEMENTS WITHIN THE MEANING OF SECTION 27A OF THE SECURITIES
ACT OF 1933, AS AMENDED, AND SECTION 21E OF THE SECURITIES EXCHANGE ACT OF 1934,
AS AMENDED. THESE FORWARD-LOOKING STATEMENTS REPRESENT THE COMPANY'S
EXPECTATIONS OR BELIEFS CONCERNING FUTURE EVENTS AND INCLUDE STATEMENTS, AMONG
OTHERS, REGARDING THE TIMING AND PROGRESS OF THE DEVELOPMENT OF THE COMPANY'S
PROPOSED PRODUCTS, FILING FOR AND RECEIVING REGULATORY APPROVALS, ACQUIRING
ADDITIONAL PRODUCTS AND TECHNOLOGIES, SOURCING OF BULK GENERICS AND THE
MANUFACTURING OF FINISHED PRODUCTS, ANTICIPATING THE MARKET OPPORTUNITIES FOR
ITS EXTRA-TM- AND PROPRIETARY PRODUCTS, MARKETING CURRENT AND PROPOSED PRODUCTS
TO HOSPITAL BUYING GROUPS AND OTHERS, DEVELOPING DISTRIBUTOR RELATIONSHIPS,
FORMING STRATEGIC MARKETING RELATIONSHIPS, INCURRING OPERATING LOSSES AND
REQUIRING ADDITIONAL CAPITAL, REDUCING INVENTORY LEVELS AND COSTS PER UNIT, AND
INCURRING CAPITAL EXPENDITURES. ACTUAL RESULTS COULD DIFFER MATERIALLY FROM
THOSE PROJECTED IN THE FORWARD-LOOKING STATEMENTS AS A RESULT OF THE FAILURE TO
RECEIVE APPROPRIATE REGULATORY APPROVALS OF MARKETING OR MANUFACTURING
ACTIVITIES ON A TIMELY BASIS, LACK OF MARKET ACCEPTANCE OF AND DEMAND FOR THE
COMPANY'S PRODUCTS, INTENSE PRICE OR PRODUCT COMPETITION, LACK OF AVAILABLE
SUPPLY OF BULK GENERICS, FAILURE TO SELL EXISTING INVENTORIES AT PRICES
SUFFICIENT TO COVER RELATED COSTS, FAILURE TO OBTAIN ADDITIONAL FINANCING AND
OTHER FACTORS SET FORTH UNDER "MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL
CONDITION AND RESULTS OF OPERATIONS-- FACTORS AFFECTING FUTURE OPERATING
RESULTS" AND ELSEWHERE IN THIS REPORT.
 
OVERVIEW
 
    SuperGen, Inc. (the "Company" or "SuperGen") is a pharmaceutical company
dedicated to the acquisition, development and commercialization of products
intended to treat life-threatening diseases, particularly cancer and blood cell
(hematological) disorders, and other serious conditions such as obesity.
SuperGen is developing its portfolio of anticancer drugs through the development
of its generic, proprietary and Extra-TM- products (its enhanced line of
patented products) and through the acquisition of certain anticancer products
which complement its portfolio and provide the Company with market
opportunities. In September 1996, SuperGen acquired the inventory and all rights
in the U.S., Canada and Mexico to the proprietary anticancer drug
Nipent-Registered Trademark- (Pentostatin) which is indicated for hairy cell
leukemia. Nipent-Registered Trademark- has also received Orphan Drug Designation
for the treatment of chronic lymphocytic leukemia ("CLL"). In January 1997, the
Company acquired the inventory, the abbreviated New Drug Application and all
related records and know-how pertaining to Etoposide, a generic anticancer
product. In late 1996 and early 1997 the Company began to actively market these
products, along with the inventory of certain other generic products acquired in
1996. The Company intends to continue to seek other promising anticancer drugs
to complement its portfolio. In addition, SuperGen has filed for governmental
approval for its first generic product, Mitomycin. It intends to file for
governmental approval in 1997 for its first Extra-TM- product, Mitomycin
Extra-TM-, currently in Phase I/II trials, and several of its other potential
anticancer products. The Company has also continued to develop a group of
proprietary blood cell disorder products for the treatment of anemia associated
with chemotherapy, radiotherapy, renal failure and aplastic anemia. SuperGen's
proprietary obesity pill, which has shown promise in early preclinical and human
studies for general obesity, is currently in Phase II clinical trials. To date,
the Company has received Orphan Drug Designations for its aplastic anemia agent
and for its obesity pill in the treatment of a genetic disorder leading to
chronic obesity. The Company has also received a grant from the U.S. government
for aplastic anemia clinical trials.
 
    The Company was founded in March 1991. Its corporate headquarters are
located at Two Annabel Lane, Suite 220, San Ramon, CA 94583.
 
                                       2
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THE DRUG DEVELOPMENT AND APPROVAL PROCESS
 
    NEW DRUG DEVELOPMENT APPROVAL.  The U.S. system of new drug approvals is the
most rigorous in the world. According to a February 1993 report by the
Congressional Office of Technology Assessment, it costs an average of $359
million and takes an average of 12 years from discovery of a compound to bring a
single new pharmaceutical to market. Only approximately one in 1,000 compounds
that enter the preclinical testing stage eventually makes it to human testing,
and only one-fifth of those are ultimately approved for commercialization. Yet,
in recent years, societal and governmental pressures have created the
expectation that drug discovery and development costs can be reduced without
sacrificing safety, efficacy and innovation. The need to significantly improve
or provide alternative strategies for successful pharmaceutical discovery,
research and development remains a major health care industry challenge.
 
    The following chart(1) illustrates the typical stages of the new drug
development and approval process:
 
                                [CHART]
 
    DRUG DISCOVERY.  In the initial stages of drug discovery before a compound
reaches the laboratory, typically tens of thousands of potential compounds are
randomly screened for activity against an assay assumed to be predictive for
particular disease targets. This drug discovery process can take several years.
Once a "screening lead" or starting point for drug development is found,
isolation and structural determination is initiated. Numerous chemical
modifications are made to the screening lead (called "rational synthesis") in an
attempt to improve the drug properties of the lead. After a compound emerges
from the above process it is subjected to further preliminary studies on the
mechanism of action, further IN VITRO screening against particular disease
targets and finally, some IN VIVO animal screening (called "pharmacology"). If
the compound passes these barriers, preliminary exploratory animal toxicology is
performed to begin to analyze the toxic effects of the compound, and if the
results are positive, the compound emerges from the basic research mode and
moves into the preclinical phase.
 
    PRECLINICAL TESTING.  During the preclinical testing stage, laboratory and
animal studies are conducted to show biological activity of the compound against
the targeted disease, and the compound is evaluated for safety. These tests
typically take approximately three and one-half years to complete.
 
    INVESTIGATIONAL NEW DRUG APPLICATION (IND).  During the preclinical testing,
an IND is filed with the FDA to begin human testing of the drug. The IND becomes
effective if the FDA does not reject it within 30 days. The IND must indicate
the results of previous experiments, how, where and by whom the new studies will
be conducted, how the chemical structure of the compound is manufactured, the
method by which it is believed to work in the human body, and any toxic effects
of the compound found in the animal studies. In addition, the IND must be
reviewed and approved by an Institutional Review Board comprised
 
- ------------------------
 
(1) Source: "The Drug Development and Approval Process" by Dale E. Wierenga,
    Ph.D. and John Beary, III, M.D., NEW MEDICINES IN DEVELOPMENT FOR CANCER,
    1995.
 
                                       3
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of physicians at the hospital or clinic where the proposed studies will be
conducted. Progress reports on detailing the results of the clinical trials must
be submitted at least annually to the FDA.
 
    Some limited human clinical testing may be done under a Physician's IND in
support of an IND application and prior to receiving an IND. A Physician's IND
is an IND application that allows a single individual to conduct a clinical
trial under less rigorous standards with a shorter FDA review process. A
Physician's IND does not replace the more formal IND process, but can provide a
preliminary indication as to whether further clinical trials are warranted, and
can, on occasion, facilitate the more formal IND process (sometimes referred to
as the "Company-sponsored INDs").
 
    PHASE I CLINICAL TRIALS.  After an IND becomes effective, Phase I human
clinical trials can begin. These tests, involving usually between 20 and 80
healthy volunteers, typically take approximately one year to complete. The tests
study a drug's safety profile, including the safe dosage range. The Phase I
clinical studies also determine how a drug is absorbed, distributed, metabolized
and excreted by the body, and the duration of its action.
 
    PHASE II CLINICAL TRIALS.  In Phase II clinical trials, controlled studies
of approximately 100 to 300 volunteer patients with the targeted disease assess
the drug's effectiveness. These tests are designed primarily to evaluate the
effectiveness of the drug on the volunteer patients as well as to determine if
there are any side effects on these patients. These studies generally take
approximately two years, and may be conducted concurrently with Phase I clinical
trials. In addition, Phase I/II clinical trials may be conducted to evaluate not
only the efficacy of the drug on the patient population, but also the safety of
the drug on the patient population.
 
    PHASE III CLINICAL TRIALS.  This phase typically lasts about three years and
usually involves 1,000 to 3,000 patients. During the Phase III clinical trials,
physicians monitor the patients to determine efficacy and to observe and report
any reactions that may result from long-term use of the drug.
 
    NEW DRUG APPLICATION (NDA).  After the completion of all three clinical
trial phases, the Company analyzes the data and, if the data indicates that the
drug is safe and effective, files an NDA with the FDA. The NDA must contain all
of the information on the drug that the company has gathered to date, including
the data from the clinical trials. NDAs are often over 100,000 pages in length.
The average NDA review time for new pharmaceuticals approved in 1994 was 19.7
months.
 
    APPROVAL.  If the FDA approves the NDA, the drug becomes available for
physicians to prescribe. The Company must continue to submit periodic reports to
the FDA, including descriptions of any adverse reactions reported. For certain
medicines, the FDA may request additional studies (Phase IV) to evaluate
long-term effects.
 
    PHASE IV CLINICAL TRIALS AND POST MARKETING STUDIES.  In addition to studies
requested by the FDA after approval, these trials and studies are conducted to
explore new indications. Such trials and studies and the publication of the
resulting data are designed primarily to broaden the application and use of the
drug and its acceptance in the medical community.
 
    ORPHAN DRUG DESIGNATION.  The Orphan Drug Act provides incentives to
manufacturers to develop and market drugs for rare diseases and conditions
affecting fewer than 200,000 persons in the United States. The first developer
to receive FDA marketing approval for an orphan drug is entitled to a seven-year
exclusive marketing period in the United States for that product. However, a
drug that is considered by the FDA to be clinically superior to or different
from another approved orphan drug, even though for the same indication, is not
barred from sale in the United States during the seven year exclusive marketing
period.
 
                                       4
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    GENERIC AND EXTRA-TM- DRUG DEVELOPMENT AND APPROVAL PROCESS.
 
    GENERIC DRUGS.  The development of a generic drug is significantly
abbreviated from that of a new drug. Once all applicable patents for a
particular drug expire, the drug is available for generic formulations.
Development of a generic drug requires identification of a source for the active
ingredient of the generic drug (the "bulk source"), as well as demonstrated
chemical equivalence of the generic formulation with the patented drug.
Obtaining an FDA-approved bulk source for anticancer drugs is usually very
difficult and time-consuming, and may significantly delay the development of a
generic drug. Once a bulk source is identified, the Company must obtain FDA
approval for the bulk source (which typically takes approximately eighteen
months) and FDA approval for the final formulation ("Marketing Approval") of the
generic drug (which typically takes approximately eighteen months). The
governmental approval process for a generic drug may be shortened to the extent
that there is overlap between the approvals for the two phases (which can run
concurrently).
 
    The following graph illustrates the typical stages of the generic drug
development and approval process:
 
                                    [CHART]
 
    EXTRA-TM- DRUGS.  The Company believes that development of enhanced
formulations of generic anticancer drugs (e.g. where the formulation is improved
from a powder to a liquid form or more soluble form) using a patented
technology, will also be significantly abbreviated from that of a new drug.
Governmental approval of a Extra-TM- drug is expected to be similar to that of a
generic drug with a slightly longer approval process for Marketing Approval
(approximately 24 months), due to the additional requirement of some preclinical
and clinical testing relating to the new formulation. As part of this process,
prior to conducting clinical testing, the Company files an IND with the FDA.
 
STRATEGY
 
    A key element of the Company's strategy is to identify, acquire and develop
pharmaceutical products in the later stages of development in order to shorten
the research and development cycle and thereby minimize the time and expense
associated with drug development. The Company believes that this approach
differs from that adopted by most pharmaceutical companies. Instead of engaging
in pure discovery research to obtain lead compounds, the Company licenses or
acquires the rights to compounds typically at the late preclinical or early
clinical stage of development that have shown efficacy in humans or in a model
relevant to a particular clinical disease. The Company then seeks to enhance and
complete the product development and bring the product to market. In its generic
and Extra-TM- drug development program, the Company targets and develops
off-patent products that have already been commercialized by others but
nevertheless offer the Company attractive market opportunities. The Company also
seeks to acquire rights from third parties to products which have already been
fully developed, FDA approved and marketed by such third parties but which the
Company believes have strong market positions or potential. The Company believes
that its approach minimizes the significant financial investment required by
pure discovery research and reduces the risk of failure in developing a
commercially viable product.
 
    SuperGen's objective is to become a leading supplier of pharmaceuticals for
life-threatening diseases, including cancer and blood cell disorders, and other
serious conditions such as obesity. The Company focuses its product development
efforts where the Company believes there are significant market opportunities,
such as in the treatment of cancer and other blood cell disorders and in obesity
as well as in smaller
 
                                       5
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niche markets where the Company believes there is limited competition, such as
certain anticancer drug markets. The Company seeks to develop a diversified
pharmaceutical offering within its focused anticancer blood cell disorder
market, including generic, Extra-TM- and proprietary drugs, and seeks to
implement a staged strategy for bringing products to market. The Company
believes that the early commercialization of its acquired anticancer products,
such as Nipent-Registered Trademark-, Etoposide and its other anticancer drugs,
is assisting the Company in developing its reputation and presence in the market
while it continues to develop its Extra-TM- and proprietary products, which have
a longer development cycle but may offer the Company a more significant market
opportunity.
 
    The Company has a highly experienced management team and maintains an
operation focused primarily on product development and clinical registration.
The Company currently outsources its manufacturing to avoid the high fixed costs
of plant, equipment and large manufacturing staff. The Company has established a
highly skilled sales and marketing organization, which it is expanding as it
brings its products to market. The Company contracts out its inventory control
function to an established third party who handles warehousing, invoicing and
product delivery. The Company believes that this operating strategy enables it
to keep its costs relatively low while maintaining high technical and
operational standards.
 
PRODUCTS AND PRODUCTS IN DEVELOPMENT
 
    The Company's current products and its products in development include its
generic and Extra-TM- anticancer drugs, proprietary compounds for blood cell and
other disorders and its obesity pill. Each of such products and potential
products is described below. See "Management's Discussion and Analysis of
Financial Condition and Results of Operations--Factors Affecting Future
Operating Results."
 
                                       6
<PAGE>
                 SUPERGEN PRODUCTS AND PRODUCTS IN DEVELOPMENT
 
<TABLE>
<CAPTION>
           DRUG                        POTENTIAL INDICATIONS                             STATUS
- ---------------------------  -----------------------------------------  -----------------------------------------
<S>                          <C>                                        <C>
MARKETED PRODUCTS(1)
 
Nipent-Registered Trademark- Hairy cell leukemia                        Currently marketed in the United States
 
Etoposide                    Refractory testicular tumors, small cell   Currently marketed in the United States
                             lung cancer
 
Methotrexate                 Breast, head, neck and lung cancer, acute  Currently marketed in the United States
                             leukemia
 
Megestrol Acetate            Breast and endometrial cancer              Currently marketed in the United States
 
Leucovorin Calcium           Rescue treatment for methotrexate          Currently marketed in the United States
 
GENERIC
 
Mitomycin                    Gastric, pancreatic, breast, lung and      Bulk source approved; Awaiting Marketing
                             colorectal cancer                          Approval from the FDA
 
Bleomycin                    Head and neck cancer, Hodgkin's disease,   Bulk source identified; Plan to file for
                             reticulum cell sarcoma, lymphosarcoma,     Marketing Approval in 1997
                             testicular cancer
 
Paclitaxel                   Various solid tumors                       Preliminary formulation and bulk sourcing
(Taxol-Registered Trademark-)                                           under evaluation
 
Vincristine                  Hodgkin's disease, leukemia,               Bulk source approved; Plan to file for
                             rhabdomyosarcoma, neuroblastoma, Wilms'    Marketing Approval in 1998
                             tumor
 
Vinblastine                  Hodgkin's disease, Kaposi's sarcoma,       Bulk source approved; Plan to file for
                             testicular cancer, lymphomas               Marketing Approval in 1998
 
EXTRA-TM-
 
MitomycinExtra-TM-           Gastric, pancreatic, breast, lung and      Bulk source approved; Currently in Phase
                             colorectal cancer                          I/II studies in cancer patients; Plan to
                                                                        file NDA in 1997
 
PentostatinExtra-TM-         Hairy cell leukemia, chronic lymphocytic   Approved bulk source owned; Formulation
                             leukemias                                  in process and preclinical testing to be
                                                                        initiated in 1997; Plan to file IND in
                                                                        1998
 
PacilitaxelExtra-TM-         Various solid tumors                       Preliminary formulation and bulk sourcing
                                                                        under evaluation; Plan to file IND in
                                                                        1997
</TABLE>
 
- ------------------------
 
(1) The Company acquired these products from third parties in late 1996 and
early 1997.
 
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<PAGE>
<TABLE>
<CAPTION>
           DRUG                        POTENTIAL INDICATIONS                             STATUS
- ---------------------------  -----------------------------------------  -----------------------------------------
<S>                          <C>                                        <C>
EtoposideExtra-TM-           Refractory testicular tumors, small cell   Bulk source approved; Formulation in
                             lung cancer                                process and preclinical testing to be
                                                                        initiated upon completion of formulation;
                                                                        Plan to file IND in 1997
 
DoxorubicinExtra-TM-         Major cancers, including leukemia,         Bulk source approved; Formulation
                             lymphoma, soft tissue sarcomas,            completed; Preclinical testing in
                             neuroblastoma osteosarcoma Wilms' tumor    process; Plan to file IND in 1997
 
DaunorubicinExtra-TM-        Leukemia                                   Bulk source approved; Formulation
                                                                        completed; Preclinical testing in
                                                                        process; Plan to file IND in 1997
 
PROPRIETARY COMPOUNDS
 
Chemoprotective and          Anemia associated with anticancer          Completed Phase I studies with normal
Radioprotective Agent        treatment                                  subjects; Currently in Phase I/II studies
                                                                        with patients
 
Renal Agent                  Anemia associated with kidney disease      Completed Phase I studies with normal
                                                                        subjects; Currently in Phase I/II studies
                                                                        with patients
 
Aplastic Anemia Agent        Aplastic Anemia                            Completed Phase I studies with normal
                                                                        subjects; Currently in Phase I/II studies
                                                                        with patients, Received Orphan Drug
                                                                        Designation and grant
 
Obesity Pill                 Chronic genetic obesity, General obesity   Completed Phase I studies with normal
                                                                        subjects; Currently in Phase II studies
                                                                        with patients
</TABLE>
 
CURRENTLY MARKETED PRODUCTS.
 
    The Company is currently marketing its anticancer products,
Nipent-Registered Trademark- and Etoposide. In September 1996, the Company
acquired the inventory and all rights, including its Orphan Drug Designations,
in the U.S., Canada and Mexico to Nipent-Registered Trademark-. In January 1997,
the Company acquired the inventory, the abbreviated New Drug Application and all
related records and know-how pertaining to Etoposide. In addition, the Company
is currently marketing the acquired inventory of three other anticancer generic
products. The Company believes that the acquisition of inventory, know-how
and/or other rights to anticancer products which have already been
commercialized offers the Company market opportunities while assisting it to
develop its reputation and presence in the market.
 
    The Company is currently marketing the following products:
 
    NIPENT-REGISTERED TRADEMARK-.  On September 30, 1996, the Company acquired
finished goods and bulk crude concentrate inventory and all rights to
Nipent-Registered Trademark- in the U.S., Canada and Mexico.
Nipent-Registered Trademark- has Orphan Drug Designation for hairy cell leukemia
until October 1998 and for CLL. In 1995, Nipent-Registered Trademark-, which is
indicated to treat hairy cell leukemia, had sales of approximately $2 million in
the U.S. and $6 million in Europe, as represented by the third party from whom
Nipent-Registered Trademark- was acquired. The Company is currently selling the
purchased inventory and expects to file for FDA approval to begin manufacturing
Nipent-Registered Trademark-. The Company has entered into a manufacturing
contract with a third party. The Company also expects to enter into a
 
                                       8
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supply agreement pursuant to which a third party will purchase from the Company
its total requirements for sales in Europe for at least seven years.
 
    ETOPOSIDE.  In January 1997, the Company acquired the inventory, the
abbreviated New Drug Application and related records and know-how pertaining to
Etoposide, which is indicated for refractory testicular tumors and small cell
lung cancer. Sales of Etoposide in the U.S. were estimated to be $50 million in
1996 and $105 million in 1995(1). There are currently six generic versions of
Etoposide that have been approved for commercial sale, in addition to the
original version produced by Bristol-Myers Squibb Company ("Bristol-Myers
Squibb"). The Company is currently selling the purchased inventory and expects
to file for FDA approval to begin manufacturing.
 
    OTHER GENERIC PRODUCTS.  In 1996, the Company purchased Methotrexate,
Megestrol Acetate and Leucovorin Calcium inventory. Methotrexate is indicated
for breast, head, neck and lung cancers and acute leukemias and Megestrol
Acetate is used to treat breast and endometrial cancer. Leucovorin Calcium is
primarily used in rescue treatment for methotrexate. The Company is currently
selling the inventory as part of its complement of anticancer drugs. These
products were acquired to establish the Company's presence in the oncology
market. The Company does not intend to further develop these products or acquire
further supplies of finished goods.
 
    OTHER PRODUCTS.  The Company currently intends to continue to evaluate and
seek other anticancer products which complement the Company's anticancer
portfolio and which may offer the Company attractive market opportunities.
 
GENERIC AND EXTRA-TM- ANTICANCER PHARMACEUTICALS.
 
    GENERIC ANTICANCER PHARMACEUTICALS.  In addition to the marketing of
Etoposide, the Company is currently developing five generic drugs. The Company
believes that early commercialization of its generic drugs will further assist
it in developing its reputation and presence in the market while it continues to
develop its Extra-TM- and proprietary products. These Extra-TM- and proprietary
products have a longer development process but may offer the Company a more
significant market opportunity.
 
    The Company's generic drugs currently under development are as follows:
 
    MITOMYCIN.  Mitomycin, with estimated sales in the U.S. of approximately $34
million in 1996 and $36 million in 1995 has primary indications in gastric and
pancreatic carcinoma and medically accepted indications in breast, lung and
colorectal cancer. The patent for Mitomycin expired in 1987, and as of December
31, 1996, only two generic versions of Mitomycin had been approved for
commercial sale in addition to the original version produced by Bristol-Myers
Squibb. The Company expects to receive Marketing Approval on its generic version
of Mitomycin in late 1997.
 
    BLEOMYCIN.  Bleomycin is indicated for the treatment of head and neck
cancer, Hodgkin's disease, reticulum cell sarcoma, lymphosarcoma and testicular
cancer. Sales of Bleomycin in the U.S. were estimated to be approximately $41
million in 1996 and $44 million in 1995. The patent for Bleomycin expired in
1989. Only one generic version of Bleomycin has been approved for commercial
sale to date. The Company has a generic version of Bleomycin currently under
development.
 
    PACLITAXEL (TAXOL-REGISTERED TRADEMARK-).  Paclitaxel
(Taxol-Registered Trademark-), which is indicated for the treatment of a variety
of solid tumors, is currently the most successful anti-cancer drug, with sales
in the U.S. of approximately $400 million in 1996 and $387 million in 1995.
Bristol-Myers Squibb's patent for Paclitaxel (Taxol-Registered Trademark-)
expires in 1997. The Company expects to file for Marketing Approval on its
generic version of Paclitaxel (Taxol-Registered Trademark-) in late 1997.
 
- ------------------------
 
(1) Unless otherwise indicated, product sales and market size information cited
in this Report consist of data provided by International Marketing Service.
 
                                       9
<PAGE>
    VINCRISTINE.  Vincristine is used to treat Hodgkin's disease, leukemia,
rhabdomyosarcoma, neuroblastoma, and Wilms' tumor. Sales of Vincristine in the
U.S. were estimated to be approximately $6.0 million in both 1996 and 1995. The
Company believes that, while Vincristine offers a limited market opportunity,
its generic version of Vincristine currently under development will complement
the Company's anticancer drug product portfolio by broadening its product line.
The patent for Vincristine expired in 1982. There are currently three generic
versions of Vincristine that have been approved for commercial sale, in addition
to the original version produced by Eli Lilly and Company. The Company expects
to file for Marketing Approval for its generic version of Vincristine in 1998.
 
    VINBLASTINE.  Vinblastine is indicated for a variety of malignant diseases
including Hodgkin's disease, Kaposi's sarcoma, testicular cancer and lymphoma.
While sales in the U.S. in 1996 were estimated to be approximately $2 million,
the Company believes that its generic version of Vinblastine will complement the
Company's anticancer drug portfolio by broadening its product line. The patent
for Vinblastine expired in 1985, and there are currently five generic versions
of Vinblastine approved for commercial sale. The Company expects to file for
Marketing Approval in 1998.
 
    The Company believes that the total estimated U.S. sales for Mitomycin and
Etoposide decreased from 1995 to 1996 due to increased competition and that
sales for these generics (as well as its other proposed generic products) may
continue to decrease in the future as a result of competitive factors, including
reductions in the per unit sales price, the introduction of additional generics
as well as other cancer drugs, new formulations for these drugs and the use of
different therapies.
 
    EXTRA-TM- ANTICANCER PHARMACEUTICALS.  The Company has developed
applications for its "Extra-TM-" encapsulation technology which it believes
significantly improves the safety profile and handling characteristics of
certain generic anticancer drugs currently on the market (the "Extra-TM-
technology"). Many anticancer generic drugs are available only in a powder form
and have to be mixed and dissolved in the correct liquid prior to
administration. The Company's Extra-TM- technology enables certain anticancer
drugs to be made in ready-to-inject, stable solutions. The ready-to-inject
stable solution not only increases the ease of administration and saves time by
eliminating the mixing procedure, but also increases the safety for the person
administering the dose by minimizing the risk of exposure to the toxins in the
drug. Moreover, the Company believes that certain of its ready-to-inject stable
solutions have a significantly longer shelf-life at room-temperature than the
mixed generic solutions, and can potentially be administered from a multidose
vial.
 
    In addition, the Company believes that its Extra-TM- technology may increase
the safety of certain existing anticancer drugs by minimizing the problem of
ulceration associated with extravasation without altering potency or activity.
Extravasation is accidental leakage of the drug into a patient's muscle or skin
from a blood vessel. Many existing anticancer pharmaceuticals, including those
under development by the Company, are potent toxins and cause serious ulceration
if extravasated. The resulting damage can be extensive and can require plastic
surgery to repair. Furthermore, because of the decrease in the ulceration risk,
the Company believes that its Extra-TM- technology can be expanded to apply to
many cancer drugs which, due to their toxicity, currently cannot be administered
locally. Such applications include intravesicular application in bladder cancer,
inperioneal application in ovarian and other cancers, intraprostate,
intracranial application for brain tumors, and intraarterial applications for
tumors accessible by the circulatory route. As a result, the Company believes
that its Extra-TM- products may have a significant competitive advantage over
their generic counterparts currently on the market.
 
    The Company has filed an application for worldwide patent protection for its
anticancer Extra-TM- technology and in February 1997 was issued its Extra-TM-
patent in the U.S. In addition, the Company has licensed the rights to the
excipient used for the Extra-TM- technology from certain third parties. At the
time the Company acquired the licenses to this excipient, the excipient was in
its later stages of development and had already undergone extensive animal
toxicology and human testing in areas other than anticancer drugs. The Company
applied the Extra-TM- technology to anticancer drugs and has developed
proprietary
 
                                       10
<PAGE>
formulations of the generic drugs Mitomycin, Pentostatin, Paclitaxel, Etoposide,
Doxorubicin and Daunorubicin with improved handling characteristics and safety
profiles.
 
    The Company's Extra-TM- drugs currently under development are as follows:
 
    MITOMYCIN EXTRA-TM-.  Mitomycin is currently available commercially in
powder form only and has indications in gastric, pancreatic, breast, lung and
colorectal cancer. The Company has completed its formulation and preclinical
testing for its Mitomycin Extra-TM- for injection and is currently conducting
Phase I/II trials.
 
    PENTOSTATIN EXTRA-TM-.  Pentostatin (Nipent-Registered Trademark-) is
indicated to treat hairy cell leukemia and has a potential application to treat
CLL. The Company believes that there is a potential for expanded oncology
markets and for non-oncology markets and has initiated preclinical studies with
Pentostatin Extra-TM-. The Company plans to file an IND application with the FDA
relating to its potential Pentostatin Extra-TM- product in 1998.
 
    PACLITAXEL EXTRA-TM-.  Paclitaxel (Taxol-Registered Trademark-) is indicated
to treat ovarian cancer and is being used experimentally to treat numerous
cancers including breast cancer. It is the fastest growing anticancer agent,
with sales in the U.S. of approximately $400 million in 1996 and $387 million in
1995. The current Paclitaxel formulation has numerous problems because the
Cremophor-Registered Trademark- EL solvent used for the injection concentrate
causes hypersensitivity reactions, leaching of plasticizer from PVC infusion
bags, haziness of diluted solutions and the need for in-line filters. The
Company believes that its potential Paclitaxel Extra-TM- product would reduce
these problems. In addition, enhanced solubility in aqueous solutions could
expand the market to direct application and create new therapy markets. The
Company expects to file an IND application with the FDA relating to its
potential Paclitaxel Extra-TM- product in 1998.
 
    ETOPOSIDE EXTRA-TM-.  Etoposide is a currently marketed product of SuperGen
with wide application against refractory testicular tumors and small cell lung
cancer. Current formulations of Etoposide have limited stability and limited
solubility. Etoposide Extra-TM- formulations would decrease such limitations.
Formulation and preclinical evaluation are currently in process, and it is
anticipated that an IND will be filed in 1998.
 
    DOXORUBICIN EXTRA-TM-.  Doxorubicin is indicated to treat every major
cancer, as well as leukemia, lymphoma, soft tissue sarcomas, neuroblastoma
osteosarcoma, and Wilms' tumor. Doxorubicin is currently sold as a powder by
four companies, and in solution form by two of these companies. Sales of
Doxorubicin in the U.S. were estimated to be approximately $75 million in 1996
and $55 million in 1995, of which sales of the solution form represented
approximately 75% and 77%, respectively. The Company has commenced preclinical
testing for its proprietary liquid reformulation of Doxorubicin and expects to
file an IND application with the FDA for its potential Doxorubicin Extra-TM-
product in 1997.
 
    DAUNORUBICIN EXTRA-TM-.  Daunorubicin is indicated to treat leukemia. Sales
of Daunorubicin in the U.S. were estimated to be approximately $11 million in
both 1996 and 1995. Daunorubicin is currently sold in powder form only. The
Company believes that Daunorubicin represents a niche market with limited
competition from large pharmaceutical companies due to its relatively small
market size. However, the Company believes the use of Daunorubicin may increase
substantially in the future, as recent experimental studies suggest that
Daunorubicin may be used in an increasing number of combination drug protocols
treating a number of cancers. The Company has commenced preclinical testing for
its potential Daunorubicin Extra-TM- product and expects to file an IND
application with the FDA for such product in 1997.
 
                                       11
<PAGE>
    OTHER PRODUCTS.  The Company currently intends to develop other Extra-TM-
products to complement its anticancer product portfolio. The Company continues
to research other applications to use its Extra-TM- technology to enhance
existing anticancer drugs.
 
PROPRIETARY PRODUCTS
 
    PROPRIETARY BLOOD CELL DISORDER PRODUCTS.  The Company is developing a
series of proprietary blood cell disorder products to treat various forms of
anemia. Anemia is the destruction of white and/or red blood cells, which weakens
the immune system, leaving patients susceptible to infection that could result
in serious illness or death. Anemia frequently results as a side effect of
existing anticancer therapies, including chemotherapy and radiation, and from
renal failure. The Company believes that its products under development may have
improved therapeutic benefits relative to existing drugs available commercially,
and may be used in conjunction with existing drugs or, in certain cases, may
replace existing drugs.
 
    The Company acquired the rights to the compounds (together with eight
associated patents) relating to its blood cell disorder agents in 1992 from a
privately-held company after the compounds had undergone extensive preclinical
laboratory and animal tests and a successful efficacy trial under a Physician's
IND unrelated to blood cell disorders. The Company refocused development of the
compounds on the treatment of blood cell disorders, continued extensive testing
of the compounds, and obtained Company-sponsored INDs for its chemotherapy and
radioprotective agent, renal agent and aplastic anemia agent. The Company has
commenced Phase I/II clinical trials for each of these potential products, and
received an Orphan Drug Designation from the FDA in November 1995 for its
aplastic anemia agent.
 
    The Company's products under development in this area consist of the
following:
 
    CHEMOPROTECTIVE AND RADIOPROTECTIVE AGENT.  Chemotherapy and radiation, used
in the treatment of cancer, deplete the patient's white blood cell supply,
thereby weakening the patient's immune system. This side effect, which can be
life-threatening itself, requires the extension of the period between
chemotherapy and radiation treatments, which may reduce their effectiveness in
combating the cancer. As a result, therapeutic agents that effectively and
speedily treat the side effect of anemia may significantly enhance the
effectiveness of anticancer treatments. Sales in the U.S. of such drugs,
estimated to be approximately $617 million in 1994, as reported by Medical
Advertising News, are dominated by Amgen, Inc.'s ("Amgen's") product
GCSF/Neupogen. Patients using this product typically require 14 to 21 days to
recover in the hospital, and, until they have recovered, are generally not able
to have another treatment of chemotherapy or radiation.
 
    The Company's preclinical tests indicate that its proprietary
chemoprotective and radioprotective agent can reduce the patient recovery
period, and can also reduce the side effects associated with existing drugs. As
a result, the Company believes that its product has significant market potential
and that its use may enhance or replace existing drugs. The Company has received
an IND and is conducting Phase I/II clinical trials on this potential product.
 
    RENAL AGENT.  Anemia associated with kidney disease is the depletion of red
blood cells. The market for U.S. sales of therapeutic agents treating anemia
associated with renal failure, estimated to be approximately $721 million in
1994, as reported by Medical Advertising News, is dominated by Amgen's
EPO/Epogen. Current therapeutic agents do not result in complete patient
recovery of the red blood cell supply and further have the negative side effect
of depleting white blood cells, rendering the patient more susceptible to
infection.
 
    The Company's preclinical tests indicate that its proprietary renal agent
may enable complete patient recovery of the red blood cell supply and does not
have the negative side effect of depleting white blood cells. As a result, the
Company believes that its renal agent may offer significant benefits over
existing
 
                                       12
<PAGE>
therapies. The Company has received an IND and recently commenced Phase I/II
clinical trials on this potential product.
 
    APLASTIC ANEMIA AGENT.  Aplastic anemia is a disease that depletes white and
red blood cells, platelets and neutrophils. The disease affects an estimated
patient population of 2,000 people per year. No current therapeutic agent in the
market effectively treats all symptoms of aplastic anemia.
 
    The Company believes that its proprietary aplastic anemia agent will be the
first therapeutic agent to treat all symptoms of aplastic anemia. The Company
believes that the potential market size opportunity for such a product is $20
million. The Company received an Orphan Drug Grant for its potential aplastic
anemia product from the FDA in June 1995 and an Orphan Drug Designation for this
product in November 1995. The Company has received an IND and a grant from the
FDA to conduct Phase I/II clinical trials on this potential product.
 
OBESITY PILL
 
    Obesity is a disorder with significant mortality and morbidity due to heart,
joint or respiratory problems. The U.S. Department of Health and Human Services
has estimated that 28% or 36 million of U.S. adults (20-74 years of age) are
defined as obese and that effective prevention of obesity could save $50 billion
annually in health care costs. Obesity drugs currently on the market are
dependent on targeting the brain for their mode of action which is to suppress
the appetite or accelerate the metabolism by amphetamine-like activity. While
many of these drugs have demonstrated an ability to assist short-term weight
loss, the long-term effects of their use have been less satisfactory as users
tend to regain the weight initially lost ("bounce back effect").
 
    The Company is developing a proprietary product in pill form for the
treatment of obesity. Based on preliminary results from animal studies, the
Company believes that the product's activity is not based on appetite
suppression or on stimulating increased metabolic activity but on modification
of the energy balance equation. This means that for the same amount of food
intake, the body may store less fat in the presence of the product.
Additionally, the product may also increase the amount of fat used to produce a
given amount of energy. In animal studies conducted at The Jackson Laboratory,
genetically obese
(OB/OB) and diabetic (DB/DB) mice were given the Company's proprietary product
and were compared against a control group which was not given the product. Both
groups ate the same amount of food. Test results showed that the mice that were
given the product appeared normal (no longer obese) while the control group
remained obese.
 
    Under a Physician's IND, in a randomized, double-blind crossover study with
17 obese human subjects over a 20-week period, subjects lost significantly more
weight when given the Company's obesity pill than during placebo administration,
and preliminary results indicated that the subjects maintained such weight loss
over an extended period (10 weeks).
 
    In 1994 the Company completed, under its own company-sponsored IND, a Phase
I tolerance and safety study that showed no adverse effects resulting from the
obesity pill. The Company is augmenting significant existing animal and human
data by sponsoring several additional animal studies and Phase II clinical
studies for general obesity and Phase I/II clinical studies for related genetic
diseases in which the major cause of morbidity and mortality is massive obesity.
The Company has received Orphan Drug Designation for its obesity pill in the
treatment of Prader-Willi Syndrome, a type of genetic obesity.
 
CLINICAL DEVELOPMENT AND REGISTRATIONS
 
    The Company believes that in-house management of clinical development and
registrations is central to the Company's strategy for the accelerated,
cost-effective commercialization of drugs. The Company has assembled a team
comprised of seasoned professionals with significant industry experience to
coordinate and manage clinical development and registrations of all Company
products.
 
                                       13
<PAGE>
MANUFACTURING
 
    The Company currently outsources its manufacturing for the bulk generics
used in its generic and Extra-TM- compounds under agreements with U.S. and
foreign suppliers acceptable to the FDA and expects to continue to outsource
manufacturing. Once a bulk generic, or proprietary compound is manufactured in
an FDA approved facility, it is sent to one or more domestic manufacturers that
process the bulk compound into the finished generic, proprietary or Extra-TM-
formulations of the Company's compounds. The Company believes it has acquired
sufficient bulk inventory for the manufacture of Nipent-Registered Trademark- to
meet its clinical and commercial needs for the foreseeable future. The Company's
finished generic and Extra-TM- products will then be shipped to an outside
vendor for distribution to the Company's customers. The Company has also entered
into agreements with domestic entities for the future production of certain of
its bulk generics as well as the initial production of its finished cytotoxic
agents required for its Extra-TM- compounds. Before production of bulk generics
can commence at this facility, however, the manufacturer must be deemed
acceptable by the FDA under the current Good Manufacturing Practices standards,
of which there can be no assurance. The Company has licensed from this
manufacturer, on an exclusive basis, proprietary fermentation technology for
anticancer agents and has filed an application with the FDA for the production
of bulk Mitomycin using this technology. In the future, the Company may adapt
its proprietary fermentation technology to produce its other bulk generics. The
Company believes its current suppliers will be able to manufacture its bulk
generics in sufficient quantities and on a timely basis, while maintaining
product quality and acceptable manufacturing costs.
 
    The Company's proprietary blood cell disorder products and obesity pill are
in clinical trials and therefore manufacturing has occurred solely for the
continued study of these products. In order to manufacture its proprietary blood
cell disorder products and obesity pill, the Company initially obtains the raw
materials from a major domestic pharmaceutical company. These raw materials then
go to three different manufacturers, each performing a different step in the
overall process, in order to create the final product. The first performs a
chemical procedure on the raw materials, the next alters the particle size of
the compound and the third turns the product into a tablet form. The Company
intends to outsource the commercial manufacturing of its blood disorder products
and obesity pill if and when such products receive final governmental approval.
 
    The Company believes that its strategy of outsourcing manufacturing is
cost-effective since it avoids the high fixed costs of plant, equipment and
large manufacturing staff, and thereby enables the Company to conserve its
resources. The Company seeks to maintain quality control over manufacturing
through ongoing inspections, rigorous review, control over documented operating
procedures, and thorough analytical testing by outside laboratories.
 
    The Company intends to continue evaluating its manufacturing requirements
and may in the long-term establish or acquire its own manufacturing facilities
to manufacture its products for commercial distribution to improve control and
flexibility of product supply and cost. See "Management's Discussion and
Analysis of Financial Condition and Results of Operations--Factors Affecting
Future Operating Results."
 
MARKETING AND SALES
 
    The Company has begun to market its anticancer products to hospitals and
private practice/oncology clinics. In the hospital market, the Company has
focused on obtaining winning bids from hospital buying groups, since they
control a significant majority of the hospital business in the oncology and
blood disorder pharmaceutical market. Since acceptance from each buying group
can be time consuming, there may be significant delays before the Company can
win bids and generate sales revenues. However, the Company has taken significant
steps toward such acceptance. The Company has gained recognition as an approved
vendor in each state which requires registration or licensing prior to bidding
for those customers and has bid aggressively to win contracts with the largest
buying groups in its product line. It intends to continue to
 
                                       14
<PAGE>
target the largest buying groups and as it attains market share, bid with other
buying groups, while seeking to minimize any price erosion that may occur.
 
    In the private practice/oncology clinic market, due to the large number of
private practice/oncology clinics in the United States, the Company intends to
develop distributor relationships. The Company will initially focus on
developing distributor relationships with the six major oncology distributors in
the United States who control approximately 60% of the approximately 1,700
private practice/oncology clinics, which represent approximately 30% of the
oncology-related pharmaceutical market.
 
    The Company's sales and marketing effort is under the direction of Frank
Brenner, Vice President of Sales and Marketing. Mr. Brenner has 20 years of
experience in pharmaceutical sales and marketing. The Company's sales and
marketing group also currently includes three regional managers who have
extensive industry experience, and the Company plans to increase its sales force
upon receipt of Marketing Approval for additional generic and Extra-TM-
products. The Company's sales and marketing group conducts direct sales, works
with distributors, performs market research analysis, develops marketing
strategies, creates and implements educational and promotional programs,
establishes pricing and product advertising, and maintains compliance with
hospital and other buying groups. The Company contracts its customer service,
warehouse and shipping responsibilities with an established outside vendor.
 
    The Company may enter into strategic marketing arrangements with third
parties particularly with respect to its obesity pill. No such strategic
arrangements exist as of the date of this Report. The Company has granted
certain marketing rights to Israel Chemicals, Ltd. ("ICL") in Israel, India,
China and South Korea with respect to all of its current potential products,
subject to the negotiation and execution of acceptable agreements.
 
PATENTS AND LICENSES
 
    The Company actively pursues a policy of seeking patent protection for its
proprietary products and technologies whether developed in-house or from outside
acquisition. The Company has acquired licenses to or assignments of numerous
U.S. Patents covering the Company's principal proprietary drugs and in February,
1997 was issued its Extra-TM- patent relating to its Extra-TM- products. The
Company entered into Patent Royalty Agreements with Progenics, Inc.
("Progenics") and The Jackson Laboratory under which Progenics and The Jackson
Laboratory assigned to the Company an exclusive license for certain patents and
patent applications (which are important to the Company's blood cell disorder
and obesity product development programs) under the condition that SuperGen pay
certain fees and royalties and take reasonable steps to achieve certain
milestones such as to file an IND, to file a NDA if commercially reasonable and
to use diligent efforts to commence a marketing program after marketing
approval. SuperGen further has a Worldwide License Agreement with Janssen
Biotech, N.V. ("Janssen") related to certain patent rights and know-how
regarding hydroxypropyl-beta-cyclodextrin ("HPBCD")(which is important to the
Company's Extra-TM- development program) which gives the Company an exclusive
license worldwide (outside the United States) in return for the payment of
certain royalties, down payments and milestone payments. In addition, the
Company has a Patent License Agreement with Cyclex, Inc. ("Cyclex") to license a
certain patent (which is important to the Company's Extra-TM- development
program) and to make and sell certain licensed products for cytotoxic anticancer
formulations containing HPBCD in the United States in return for payments of
certain royalties to Cyclex. The Company also has a License Agreement with
Pharmos Corporation ("Pharmos") to license certain licensed products under a
licensed patent right (which is important to the Company's Extra-TM- development
program) in return for which the Company will pay certain royalties and payments
after the filing of an NDA by the Company.
 
    In addition to pursuing patent protection in appropriate cases, the Company
relies on trade secret protection for its unpatented proprietary technology. The
Company also pursues a policy of having its employees and consultants execute
proprietary information agreements upon commencement of employment or consulting
relationships with the Company, which agreements provide that all confidential
 
                                       15
<PAGE>
information developed or made known to the individual during the course of the
relationship shall be kept confidential except in specified circumstances. See
"Management's Discussion and Analysis of Financial Condition and Results of
Operations--Factors Affecting Future Operating Results."
 
COMPETITION
 
    Competition in the area of pharmaceutical products is intense. There are
many companies, both public and private, including well-known pharmaceutical
companies, that are engaged in the development and sales of pharmaceutical
products for certain of the applications being pursued by the Company.
SuperGen's competitors and probable competitors include Amgen, Chiron Corp.
("Chiron"), Gensia, Inc. ("Gensia"), Bristol-Myers Squibb and Immunex Corp.
("Immunex"), among others. Most of these companies have substantially greater
experience and financial, research and development, manufacturing and marketing
resources than the Company does and represent substantial long term competition
for the Company. Such companies may succeed in developing pharmaceutical
products that are more effective or less costly than any that may be developed
or marketed by the Company.
 
    Factors affecting competition in the pharmaceutical industry vary depending
on the extent to which the competitor is able to achieve a competitive advantage
based on proprietary technology. If the Company is able to establish and
maintain a significant proprietary position with respect to its blood cell
disorder compounds, its obesity pill and, to a lesser extent, its Extra-TM-
products, competition will likely depend primarily on the effectiveness of the
product and the number, gravity and severity of its unwanted side effects as
compared to alternative products. Competition with respect to generic products
is based primarily on price and, to a lesser extent, on name recognition and the
reputation of the manufacturer in its target markets. Moreover, the number of
competitors offering a particular generic product can dramatically affect price
and gross margin for that product. The Company may be at a disadvantage in
competing with more established companies on the basis of price or market
reputation. Moreover, increased competition in a particular generic market would
likely lead to significant price erosion which would have a negative effect on
the Company's gross profit margins. The Company believes that the total
estimated U.S. sales for Mitomycin and Etoposide, as well as other of the
Company's proposed generic products, have decreased in recent years due to
increased competition and that sales of these generics may continue to decrease
as a result of competitive factors, including the introduction of additional
generics and other cancer drugs, new formulations for those drugs and the use of
different therapies.
 
    The industry in which the Company competes is characterized by extensive
research and development efforts and rapid technological progress. Although the
Company believes that its proprietary position may give it a competitive
advantage with respect to its proposed nongeneric drugs, new developments are
expected to continue and there can be no assurance that discoveries by others
will not render the Company's current and potential products noncompetitive. The
Company's competitive position also depends on its ability to attract and retain
qualified scientific and other personnel, develop effective proprietary
products, implement development and marketing plans, obtain patent protection
and secure adequate capital resources. See "Management's Discussion and Analysis
of Financial Condition and Results of Operations--Factors Affecting Future
Operating Results."
 
EMPLOYEES
 
    As of December 31, 1996, the Company had 30 full-time employees. The Company
uses consultants and temporary employees to complement its staffing. There can
be no assurance that the Company will be able to continue to attract and retain
qualified personnel in sufficient numbers to meet its needs. The Company's
employees are not subject to any collective bargaining agreements, and the
Company regards its relations with employees to be good. See "Management's
Discussion and Analysis of Financial Condition and Results of
Operations--Factors Affecting Future Operating Results."
 
                                       16
<PAGE>
                                   MANAGEMENT
 
DIRECTORS AND OFFICERS
 
    The directors and officers of the Company and their ages as of December 31,
1996 are as follows:
 
<TABLE>
<CAPTION>
NAME                              AGE                              POSITION
- ----------------------------      ---      ---------------------------------------------------------
<S>                           <C>          <C>
Joseph Rubinfeld............          64   Chief Executive Officer, President, Chief Scientific
                                             Officer and Director
Frank Brenner...............          49   Vice President of Sales and Marketing
Christine A. Carey..........          38   Vice President of Business Development
Frederick L. Grab...........          55   Vice President of Pharmaceutical Operations
R. David Lauper.............          52   Vice President of Professional Services
Francis H. Lee..............          48   Vice President of Clinical Development and Registrations
Henry C. Settle, Jr.........          48   Chief Financial Officer
Simeon M. Wrenn.............          52   Vice President of Biotechnology
Denis Burger (1)(2).........          53   Director
David M. Fineman............          53   Director and Secretary
J. Gregory Swendsen.........          44   Director
Julius A. Vida..............          68   Director
Daniel Zurr (1)(2)..........          48   Director
</TABLE>
 
- ------------------------
 
(1) Member of the Compensation Committee.
 
(2) Member of the Audit Committee.
 
    JOSEPH RUBINFELD, PH.D., co-founded the Company in 1991. He has served as
Chief Executive Officer, President, Chief Scientific Officer and a director of
the Company since its inception. Dr. Rubinfeld was one of the four initial
founders of Amgen in 1980 and served as Vice President and Chief of Operations
until 1983. From 1987 to 1990, he was a Senior Director at Cetus Corporation.
From 1968 to 1980, Dr. Rubinfeld was employed at Bristol-Myers Squibb (formerly
Bristol-Myers International Corporation ("Bristol-Myers")) in a variety of
positions, most recently as Vice President and Director of Research and
Development. While at Bristol-Myers, Dr. Rubinfeld was instrumental in licensing
the original anticancer line of products for Bristol-Myers, including Mitomycin
and Bleomycin. Prior to that time, Dr. Rubinfeld was a research scientist with
several pharmaceutical and consumer product companies including Schering-Plough
Corporation and Colgate-Palmolive Co. He received his B.S. in chemistry from
C.C.N.Y., and his M.A. and Ph.D. in chemistry from Columbia University. Dr.
Rubinfeld has numerous patents and/or publications on a wide range of inventions
and developments including the 10-second developer for Polaroid film,
manufacture of cephalosporins (the next generation of antibiotics following
penicillin) and the first commercial synthetic biodegradable detergent. In 1984
Dr. Rubinfeld received the Commonwealth Award for Invention.
 
    FRANK BRENNER joined the Company as Vice President of Sales and Marketing in
January 1994. Prior to joining the Company, he was an independent management
consultant for various biotechnology and pharmaceutical companies from September
1991 to January 1994. From December 1987 to September 1991 Mr. Brenner was
Senior Director of National Sales for Cetus Corporation and was a Regional Sales
Manager from October 1986 to December 1987. Prior to that time, he served in a
variety of positions at Lederle International, including as Senior Product
Manager. Mr. Brenner received his B.S. from California State University at
Dominguez Hills.
 
    CHRISTINE A. CAREY, PHARM.D., J.D., has served as Vice President of Business
Development since November 1996 and as Senior Director, Marketing and Business
Development, from January 1995 to October 1996. Dr. Carey was a consultant to
the Company in the areas of marketing, FDA regulatory
 
                                       17
<PAGE>
affairs, licensing and business development from March 1993 to December 1994.
Prior to joining SuperGen, she worked in the specialized cytokine development
unit of Sandoz Pharmaceutical Corporation from 1992 to 1993. From 1990 to 1991,
she was Manager, Business Development, at Cetus Corporation. From 1986 to 1989,
she served as Pharmaceutical Sales Representative for Schering Corporation. Dr.
Carey received her B.S. from the University of Pittsburgh, her J.D. from Golden
Gate University School of Law and her Pharm.D. from the State University of New
York in Buffalo.
 
    FREDERICK L. GRAB joined the Company as Vice President of Pharmaceutical
Operations in July 1996. From April 1989 to July 1996, Dr. Grab was Director,
Regulatory Affairs, Generic Drugs for Pharmacia Inc., a developer and
manufacturer of pharmaceuticals. From August 1982 to April 1988, Dr. Grab served
as Manager, Pharmaceutical Product Development at Pharmacia Inc. Dr. Grab
received his B.S. in Pharmacy from Columbia University, College of Pharmacy and
his Ph.D. in pharmaceutical chemistry from the University of California, San
Francisco Medical Center.
 
    R. DAVID LAUPER, PHARM. D., has served as Vice President of Professional
Services since December 1996 and as Vice President of Oncology Product
Development from August 1995 to November 1996. Dr. Lauper joined SuperGen from
Chiron where he served as Director of Professional Services, Chiron Therapeutics
from 1994 to 1995. Prior to that time, from 1986 to 1993, Dr. Lauper served in
the same capacity at Cetus Corporation. From 1980 to 1986, Dr. Lauper was with
Bristol-Myers Squibb as Assistant Director of Medical Information Oncology. He
received his Pharm.D. in pharmacy from the University of California School of
Pharmacy.
 
    FRANCIS H. LEE, PH.D., has served as Vice President of Clinical Development
and Registrations since February 1994. Dr. Lee was a consultant to the Company
in the capacity of director of clinical development and registrations from
January 1993 to January 1994. Prior to joining the Company, Dr. Lee worked at
the Clinical Research and Development Department of Fujisawa Pharmaceutical
Company, Ltd. from 1988 to 1992, where he was Director of Clinical Research and
Development. From 1987 to 1988, Dr. Lee served as Director of the Clinical
Oncology group at Warner-Lambert Company. From 1983 to 1987, he served as
Associate Medical Director of Oncology and Infectious Diseases at DuPont
Corporation. Dr. Lee received his B.A. in chemistry from the University of
Oregon, and his Ph.D. in biopharmaceuticals and clinical pharmacology from the
State University of New York in Buffalo.
 
    HENRY C. SETTLE has served as the Chief Financial Officer since May 1996.
Prior to joining the Company, Mr. Settle was a consultant from February 1996 to
May 1996 and was a partner at Ernst & Young LLP from October 1986 to June 1995.
He received his B.A. in economics from the University of California, Santa
Barbara and his M.B.A. from the University of California, Los Angeles. He is a
C.P.A.
 
    SIMEON M. WRENN, PH.D., joined SuperGen in January 1996 as Vice President of
Biotechnology. From September 1995 to January 1996 he was a consultant to The
Purdue Frederick Company, a privately held manufacturer and distributor of drug
products. From 1983 to 1995, Dr. Wrenn served in several senior research and
product development positions at Lederle Laboratories. He also was a founding
scientist of Centocor, Inc. Dr. Wrenn has been an Assistant Professor of
Medicine at Baylor College and the University of Pennsylvania and an Associate
Professor of Medicine at Johns Hopkins University. He received his Ph.D. from
Emory University in Atlanta, Georgia and completed his Postdoctoral Fellowship
at Harvard Medical School and Massachusetts General Hospital in Boston,
Massachusetts.
 
    DENIS BURGER, PH.D., has served as a director of the Company since January
1996. Dr. Burger has served as President and Chief Operating Officer of
AntiVirals, Inc., a biotechnology company specializing in gene-targeted
therapeutic and diagnostic products since February 1992 and as Chief Executive
Officer since February 1996. Dr. Burger was a co-founder of Epitope, Inc., a
biotechnology company, and served as its Chairman from 1981 until 1990. He has
also been the general partner of Sovereign Ventures, LLC, a biotechnology
consulting and merchant banking venture since 1991. Dr. Burger is a member of
the Board of Directors of Cellegy Pharmaceuticals, Inc., AntiVirals Inc., and
Trinity Biotech, PLC. He received his
 
                                       18
<PAGE>
B.A. in Bacteriology and Immunology from the University of California, Berkeley
and his M.S. and Ph.D. in Microbiology and Immunology from the University of
Arizona, Tucson.
 
    DAVID M. FINEMAN, a co-founder of the Company, has served as a director of
the Company since its inception and has served as Acting Chief Financial Officer
from December 1995 to March 1996. Mr. Fineman served as Secretary from the
Company's inception until December 1996. He served as a General Partner of
Strategic Pharmaceutical Partners I & II, the California limited partnerships
which provided the initial funding for the Company. He received his B.A. from
the University of Maryland and an M.A. from the Graduate Faculty of the New
School for Social Research in New York, where he also completed his Ph.D. course
work.
 
    J. GREGORY SWENDSEN, a co-founder of the Company, has served as a director
of the Company since its inception. Mr Swendsen was the Treasurer of the Company
from its inception until December 1995. He is President of Swendsen & Company, a
management company founded in 1984 that specializes in venture capital in
applied technology industries. Mr. Swendsen was a General Partner of Strategic
Pharmaceutical Partners I & II, which provided the initial funding for the
Company.
 
    JULIUS A. VIDA, PH.D., has served as a director of the Company since January
1996. Since June 1993, Dr. Vida has served as President of Vida International
Pharmaceutical Consultants. From 1976 to May 1993, Dr. Vida worked at
Bristol-Myers Squibb, where he served as Vice President of Business Development,
Licensing and Strategic Planning from 1991 to 1993, as Vice President of
Licensing from 1985 to 1991 and as Director of Licensing from 1982 to 1985. Dr.
Vida is a member of the Board of Directors of Biomatrix, Inc., Medarex, Inc.,
FibroGen, Inc., Codon Pharmaceuticals, Inc., and Drug Innovation and Design,
Inc., all biotechnology companies. Dr. Vida received his Ph.D. in Chemistry from
Carnegie Mellon University and his M.B.A. from Columbia University.
 
    DANIEL ZURR, PH.D., has been a director of the Company since January 1994.
Dr. Zurr currently serves as Chief Executive Officer of Expression Systems, Inc.
Dr. Zurr served as Scientific Director and Business Development Director of the
Pharmaceutical Division of ICL from 1984 to 1995. He also served as Director of
Licensing at G.D. Searle & Company, Limited, from 1980 to 1983. He was Chief
Executive Officer of Plantex-Ikapharm, an Israeli pharmaceutical company, from
1975 to 1980. Dr. Zurr received his M.Sc. at the Hebrew University of Jerusalem
and his Ph.D. from the Imperial College University of London in 1972.
 
SCIENTIFIC ADVISORY BOARD
 
    The Company has established relationships with a group of scientific
advisors with expertise in their respective fields that align with Company
sponsored programs. Each scientific advisory board member is responsible for a
study or program relevant to the Company's data generation for FDA filings and
approval. The Company holds formal semi-annual scientific advisory board
meetings to review ongoing studies and exchange ideas. The Company's scientific
advisors consult with management of the Company regarding the status of the
Company's work in progress and the evaluation of prospective opportunities for
the Company.
 
    The Company pays certain of its scientific advisors consulting fees or
salaries and provides reimbursement for expenses incurred in connection with
service to the Company.
 
    The Company's scientific advisors include the following persons:
 
    JOSEPH RUBINFELD, PH.D.  Dr. Rubinfeld is Chairman of the Scientific
Advisory Board. See "Directors and Officers."
 
    H. LEON BRADLOW, PH.D.  Dr. Bradlow is currently President of Amur Research
Corp. and the Director of Laboratories at the Murray Raeburn Laboratory of
Biochemistry and Endocrinology at Strang-Cornell Research Laboratory, as well as
a Professor of Biochemistry in Surgery and Pediatrics at Cornell
 
                                       19
<PAGE>
Medical School and Professor Emeritus at Rockefeller University and Albert
Einstein College of Medicine. Dr. Bradlow served as editor of STEROIDS and has
numerous publications in the fields of biochemistry, steroids, and the etiology
of breast cancer. Since April 1992, in addition to serving on the Company's
Scientific Advisory Board, Dr. Bradlow served as a Consulting Director of
Natural Product Research from the Company's inception until December 1995. Dr.
Bradlow received his Ph.D. from the University of Kansas.
 
    FRED I. CHASALOW, PH.D.  Dr. Chasalow is currently the Scientific Director
of Amur Research Corp. Previously, he served as Professor of Biochemistry in
Pediatrics at the State University of New York (SUNY), Downstate, and Director
of the Endocrine Laboratory and Chief of Pediatric Endocrine Research at
Maimonides Medical Center in Brooklyn, New York. He is a current member of the
Society for the Study of Reproduction, the Endocrine Society, the Clinical
Ligand Assay Society, the American Society for Biological Chemistry and
Molecular Biology, the Society for Pediatric Research, the International Growth
Hormone Research Society and the Lawson Wilkins Pediatric Endocrine Society. Dr.
Chasalow received his Ph.D. from Brandeis University.
 
    FRANK H. GARDNER, M.D.  Dr. Gardner is a Clinical Professor of Medicine,
Hematology and Oncology at the University of Texas Medical Branch in Galveston,
Texas. He is a past Director of Medicine and of the Hematology Research
Laboratory at the University of Pennsylvania Presbyterian Medical Center, has
served as Associate Clinical Professor of Medicine at Harvard Medical School,
and has been a Consultant in Medicine to the Surgeon General of the United
States Army. Dr. Gardner has participated in numerous task forces, studies and
committees, including the protocol studies of the Southwest Oncology Group, the
Panel of Hematologic Agents, Drug Efficacy Study of the National Academy of
Sciences and the National Breast Cancer Task Force of the National Cancer
Institute. He is a former Scientific Counselor at the National Cancer Institute.
Dr. Gardner received his M.D. from Northwestern University Medical School.
 
    HARINDER S. JUNEJA, M.D.  Dr. Juneja is an Associate Professor of Medicine
at the University of Texas Health Science Center at Houston. He has extensive
clinical and laboratory experience related to the Company's blood cell disorder
projects, and his background is based in hematological diseases, and in
particular leukemia and the bone marrow micro-environment. Dr. Juneja's current
and past research support includes both the National Institutes of Health
("NIH") and the FDA. Dr. Juneja is a graduate of the All India Institute of
Medical Sciences, New Delhi, India.
 
    JOSEPH KAPLAN, M.D.  Dr. Kaplan is a Professor of Pediatrics, Immunology,
Microbiology and Medicine at Wayne State University School of Medicine, as well
as being Director of Research at Children's Hospital of Michigan and Director of
Clinical Immunology, Division of Hematology-Oncology at Wayne State University
School of Medicine. He has served on several NIH committees. Dr. Kaplan's
research has been focused on leukemia, bone marrow transplants and sickle cell
anemia. He received his M.D. from Johns Hopkins School of Medicine.
 
    GERALD SCHOCHETMAN, PH.D.  Dr. Schochetman is the Chief of the HIV
Laboratory Investigations Branch, Division of AIDS, STD and TB Laboratory
Research at the Centers for Disease Control and Prevention ("CDC"), Atlanta,
Georgia and Adjunct Associate Professor of Pediatrics at Emory University School
of Medicine. He was Department Head of Cell Biology and Immunology at Amgen, and
he was Vice President for Scientific Affairs at IGEN, Inc. Dr. Schochetman's
current committee membership includes the World Health Organization ("WHO")
Working Group on Vaccine Development, the National Institute of Allergies and
Infectious Diseases ("NIAID") HIV Genetics Variation Committee, and the U.S.
Public Health Service AIDS Vaccine Research and Development Subgroup. He
received a B.S. from the City College of New York and his Ph.D. in Molecular
Biology from the University of Pennsylvania.
 
                                       20
<PAGE>
DIRECTOR COMPENSATION
 
    All non-employee directors of the Company other than David M. Fineman and J.
Gregory Swendsen (the "Outside Directors") will receive $1,000 in compensation
for attendance at each meeting of the Board of Directors and for each Board
Committee meeting held on a different day and will be reimbursed for all
reasonable expenses incurred by them in attending Board and Committee meetings.
The Company has adopted the 1996 Directors' Stock Option Plan providing for
stock options to be granted to certain non-employee directors.
 
ITEM 2.  PROPERTIES.
 
    The Company's principal administrative facility is currently located in
approximately 9,247 square feet of leased space in San Ramon, California, under
a lease which expires on February 1, 2002. The Company also leases approximately
2,248 and 2,527 square feet of office and laboratory space in Des Plaines,
Illinois, under leases which expire on October 9, 1997 and October 9, 2000
respectively, and approximately 3,217 square feet of office space in Parsippany,
New Jersey under a lease which expires on September 1, 2001. The Company has
entered into an agreement to purchase an industrial condominium building
containing approximately 9,600 square feet in Pleasanton, California, and will
be moving its Illinois office and laboratory operation to the Pleasanton
location upon completion of the improvements. The Company believes that such
facilities will be adequate to meet its current and reasonably anticipated needs
for the next year. The Company plans to sublease its prior business offices
located in Emeryville, California, to a third party sublessee for the balance of
the lease term, which extends until August 31, 1998.
 
ITEM 3.  LEGAL PROCEEDINGS
 
    There are currently no pending or threatened material legal actions against
the Company.
 
ITEM 4.  SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS.
 
    No matters were submitted to a vote of the Company's shareholders during the
fiscal quarter ended December 31, 1996.
 
                                    PART II
 
ITEM 5.  MARKET FOR REGISTRANT'S COMMON EQUITY AND RELATED
       SHAREHOLDER MATTERS.
 
MARKET FOR COMMON STOCK
 
    Pursuant to the Company's initial public offering, the Company's Common
Stock commenced trading on the Nasdaq National Market on March 13, 1996. The
Company's Common Stock is listed on the Nasdaq National Market under the symbol
"SUPG." The Company's Common Stock Purchase Warrants are listed on the Nasdaq
National Market under the symbol "SUPGW." The following table sets forth for the
periods indicated the high and low closing sales prices for the Common Stock as
reported on the Nasdaq National Market.
 
<TABLE>
<CAPTION>
                                                                               HIGH        LOW
                                                                             ---------  ---------
<S>                                                                          <C>        <C>
FISCAL 1996
From March 13, 1996 through March 31, 1996.................................  $    5.25  $    4.25
Quarter ended June 30, 1996................................................  $   16.13  $    4.44
Quarter ended September 30, 1996...........................................  $   14.50  $    9.25
Quarter ended December 31, 1996............................................  $   15.56  $   11.63
 
FISCAL 1997
Quarter ended March 31, 1997...............................................  $   14.06  $   10.00
  (through March 25, 1997)
</TABLE>
 
                                       21
<PAGE>
HOLDERS OF RECORD
 
    As of March 25, 1997, there were approximately 249 holders of record of the
Common Stock.
 
DIVIDENDS
 
    The Company has never paid cash dividends on its capital stock and does not
expect to pay any dividends in the foreseeable future. The Company intends to
retain future earnings, if any, for use in its business.
 
RECENT SALES OF UNREGISTERED SECURITIES
 
    On September 30, 1996, the Company issued $1,000,000 in unregistered
restricted shares of the Company's Common Stock to a third party in connection
with the Company's purchase of certain assets pertaining to
Nipent-Registered Trademark-, including all of the crude concentrate and certain
of the finished goods inventory, trademarks, patents and know-how, the NDA
(including two Orphan Drug Designations), Canadian New Drug Submission and
certain clinical studies. In addition to the unregistered Common Stock, the
Company paid $2,073,000 in cash and agreed to pay an additional $500,000 in cash
upon the earlier of the date of FDA manufacturing approval or December 31, 1997.
The Shares were issued in reliance of Section 4(2) of the Securities Act. There
was no public solicitation in connection with the issuance of the Shares nor
were there any other offerees. The Company relied on representations from the
third party that it purchased the Shares for investment for its own account and
not with a view to, or for resale in connection with, any distribution thereof
and that it was aware of the Company's business affairs and financial condition
and had sufficient information to reach an informed and knowledgeable decision
regarding the acquisition of the Shares.
 
    On February 6, 1996, the Company issued 26,800 Units, with each Unit selling
for $5.00 cash and consisting of one share of Common Stock and one warrant to
purchase an additional share of Common Stock. The warrants are exercisable at
any time prior to February 6, 2001, at an exercise price of $5.00 per share and
are redeemable by the Company at $.25 per warrant upon 30 days written notice,
provided that the closing price of the Common Stock for each of the ten
consecutive trading days immediately preceding the date of such notice exceeded
$10.00. The Units were issued in reliance of Rule 506 of the Securities Act in a
private offering to accredited investors. The Company relied on representations
from each of the investors that he acquired the Units for investment for his own
account and not with a view to, or for resale in connection with, any
distribution thereof.
 
ITEM 6.  SELECTED FINANCIAL DATA.
 
    The information set forth below is not necessarily indicative of results of
future operations and should be read in conjunction with the financial
statements and notes thereto appearing in Item 14 of Part IV of this Report.
 
<TABLE>
<CAPTION>
                                                           NINE MONTHS
                                              YEAR ENDED      ENDED      YEAR ENDED   YEAR ENDED   YEAR ENDED
                                             DECEMBER 31,  DECEMBER 31,   MARCH 31,    MARCH 31,    MARCH 31,
                                                 1996          1995         1995         1994         1993
                                             ------------  ------------  -----------  -----------  -----------
<S>                                          <C>           <C>           <C>          <C>          <C>
Net sales and other operating revenue......   $  263,677    $   12,574   $   168,628  $   --       $   --
Net loss...................................   (8,757,635)   (2,728,687)   (3,638,947)  (7,462,576)  (1,253,560)
Total assets...............................   17,873,416     2,161,583     2,440,114    2,110,021      113,528
Net loss per common share..................   $    (0.55)   $    (0.22)  $     (0.31) $     (0.89) $     (0.19)
</TABLE>
 
                                       22
<PAGE>
ITEM 7.  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
         OF OPERATIONS
 
    THE FOLLOWING DISCUSSION CONTAINS FORWARD-LOOKING STATEMENTS WITHIN THE
MEANING OF SECTION 27A OF THE SECURITIES ACT OF 1933, AS AMENDED, AND SECTION
21E OF THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED. THESE FORWARD-LOOKING
STATEMENTS REPRESENT THE COMPANY'S EXPECTATIONS OR BELIEFS CONCERNING FUTURE
EVENTS AND INCLUDE STATEMENTS, AMONG OTHERS, REGARDING THE TIMING AND PROGRESS
OF THE DEVELOPMENT OF THE COMPANY'S PROPOSED PRODUCTS, FILING FOR AND RECEIVING
REGULATORY APPROVALS, ACQUIRING ADDITIONAL PRODUCTS AND TECHNOLOGIES, SOURCING
OF BULK GENERICS AND THE MANUFACTURING OF FINISHED PRODUCTS, MARKETING CURRENT
PRODUCTS, INCURRING OPERATING LOSSES AND REQUIRING ADDITIONAL CAPITAL, REDUCING
INVENTORY LEVELS AND COSTS PER UNIT, AND INCURRING CAPITAL EXPENDITURES. ACTUAL
RESULTS COULD DIFFER MATERIALLY FROM THOSE PROJECTED IN THE FORWARD-LOOKING
STATEMENTS AS A RESULT OF THE FAILURE TO RECEIVE APPROPRIATE REGULATORY
APPROVALS OF MARKETING OR MANUFACTURING ACTIVITIES ON A TIMELY BASIS, LACK OF
MARKET ACCEPTANCE OF AND DEMAND FOR THE COMPANY'S PRODUCTS, INTENSE PRICE OR
PRODUCT COMPETITION, LACK OF AVAILABLE SUPPLY OF BULK GENERICS, FAILURE TO SELL
EXISTING INVENTORIES AT PRICES SUFFICIENT TO COVER RELATED COSTS, FAILURE TO
OBTAIN ADDITIONAL FINANCING AND OTHER FACTORS SET FORTH IN "--FACTORS AFFECTING
FUTURE OPERATING RESULTS" AND ELSEWHERE IN THIS REPORT.
 
OVERVIEW
 
    The Company commenced operations in 1991 and is engaged in the acquisition,
development and commercialization of pharmaceutical products intended to treat
life-threatening diseases, particularly cancer, blood cell (hematological)
disorders and other serious conditions such as obesity. As of December 31, 1996,
the Company is in the development stage and has generated only limited product
sales to date, and there can be no assurance that substantial additional
revenues from product sales will be achieved. The Company has incurred losses
since its inception and expects to continue to incur significant operating
losses.
 
    From its inception through May 1993, the Company's principal operations
involved conducting research and development relating to its generic and
Extra-TM- products under contractual agreements with two affiliated limited
partnerships (the "Affiliated Partnerships"). Under these agreements, the
Company received cash funding of $2.1 million for work performed for the
Affiliated Partnerships. In May 1993, the Company issued 1.1 million shares of
its Common Stock in exchange for the rights to the in-process research and
development and $570,000 of cash of one of the Affiliated Partnerships and, in
January 1994, the Company issued 1.6 million shares of its Common Stock and paid
$470,000 of cash in exchange for the rights to the in-process research and
development of the second Affiliated Partnership. In connection with these
transactions, SuperGen recorded non-cash charges to operations of $4.9 million
for the acquisitions of the in-process research and development from the
Affiliated Partnerships.
 
    The Company historically had a fiscal year ending March 31. Effective
January 1996, the Company changed its fiscal year to end on December 31 of each
year by reporting a nine-month fiscal period commencing April 1, 1995 and ending
December 31, 1995. The Company's historical operations and the financial
information included in this Report are not necessarily indicative of its future
operating results, financial condition, or cash flows.
 
RESULTS OF OPERATIONS
 
    Total operating expenses increased from $487,000 during the year ended March
31, 1992 to $1.3 million, $7.5 million, and $3.9 million in the years ended
March 31, 1993 and 1994 and 1995, respectively, reflecting growth in internal
research and support staff, the use of research and development consultants and
subcontractors, and increased facilities costs due to expanded research and
development work for the two Affiliated Partnerships. Total operating expenses
in fiscal 1994 included a non-cash charge of $4.9 million for the acquisition of
in-process research and development from the Affiliated Partnerships, as
described above.
 
                                       23
<PAGE>
    Management believes that the comparison between the year ended December 31,
1996, the nine months ended December 31, 1995, and the year ended March 31, 1995
is not meaningful because of the difference in the length of the reported
periods. Therefore, the discussion and analysis of the results of operations
below describes the amounts and nature of the operations in each of those
periods.
 
YEAR ENDED DECEMBER 31, 1996
 
    Net sales of approximately $226,000 and related cost of sales resulted from
the introduction of the Company's first four products in the fourth quarter and
were principally due to sales of finished vials of Nipent-Registered Trademark-
acquired from a third party. However, until manufacturing approval is obtained
from the FDA, sales of Nipent-Registered Trademark- are limited to supplies on
hand. See "--Factors Affecting Future Operating Results-- Limited Supply;
Manufacturing Limitations." Grant revenues of $37,715 relate to a U.S.
Government grant for the study of one of the Company's proprietary compounds in
the treatment of aplastic anemia.
 
    Research and development expense of $6.6 million was due to substantial
activity following the Company's initial public offering in March 1996,
primarily in pursuing Marketing Approval for Mitomycin; development of the
Extra-TM- product line, and clinical and preclinical studies for the propriety
compounds such as the obesity pill and aplastic anemia agent. Approximately 19%
of such costs related to salaries, 36% to amounts paid to outside contractors
and 11% to the purchase of in-process technology. The Company expects its
research and development expense to continue to increase as it expands its
product development activities.
 
    Sales and marketing expense resulted primarily from establishing a core
sales force to coincide with the product introductions discussed above. Of the
total expense of $982,000, approximately 36% was due to salaries; 22% to outside
services for marketing surveys, trade shows, and demographic studies; and 13% to
related publications and promotional materials. The Company expects sales and
marketing expense to increase in support of current products and as other
products, if any, are introduced.
 
    General and administrative expense totaled approximately $1.9 million and
was comprised of costs to support the Company's expansion in research and
development, sales and marketing and other operational areas; activities
associated with the increased administrative requirements of a public company
and related personnel costs. Of the total general and administrative cost,
approximately 19% was due to salaries; 27% was related to consulting and other
outside services, primarily business development activities; 16% was for legal,
audit and accounting services; and 11% was for insurance. The Company expects
general and administrative expense to increase in support of expected increases
in research and development and product introduction activities.
 
    Interest income of approximately $750,000 resulted from investing available
cash balances in a money market fund subsequent to receiving the net proceeds of
$21.5 million from the Company's initial public offering in March 1996.
 
NINE MONTHS ENDED DECEMBER 31, 1995 AND THE YEAR ENDED MARCH 31, 1995
 
    The Company had no sales revenues for these periods. Other revenues were
immaterial during the nine months ended December 31, 1995 and were $169,000
during the year ended March 31, 1995, all of which related to research and
development work performed for ICL.
 
    Research and development expenses of $2.2 million and $3.0 million during
the nine months ended December 31, 1995 and the year ended March 31, 1995,
respectively, were due primarily to the Company's expansion of its clinical
trials and regulatory operations in Illinois. The Company hired additional
personnel and leased its Illinois facility in October 1994. The increase in
costs related to the Illinois operation was partially offset by a decrease in
amounts paid to research consultants and contractors.
 
    Sales and marketing expenses of $161,000 and $198,000 in the nine months
ended December 31, 1995 and the year ended March 31, 1995 respectively, were
primarily salaries for a small core marketing staff.
 
                                       24
<PAGE>
    General and administration expenses were approximately $482,000 and $735,000
for the nine months ended December 31, 1995 and the year ended March 31, 1995,
respectively, and were incurred in support of research and development and sales
and marketing activities. The decrease was primarily due to the expiration of a
financial consulting arrangement in December 1994.
 
    As of December 31, 1996, the Company had federal net operating loss
carryforwards of approximately $16.4 million expiring in various years from 2009
through 2011. Annual utilization of the Company's tax carryforwards may be
partially limited due to certain ownership changes.
 
LIQUIDITY AND CAPITAL RESOURCES
 
    The Company has financed its operations since inception primarily through
private equity sales totaling $10.4 million, contract research funding of $2.1
million from research and development agreements with its Affiliated
Partnerships and net proceeds of $21.5 million from the sale of Common Stock and
Warrants in its initial public offering in March 1996. Through December 31,
1996, the Company had incurred a cumulative net loss of $24.3 million, of which
$4.9 million related to the non-cash charges to operations for the acquisition
of in-process research and development.
 
    The Company's cash and cash equivalents were $1.8 million at December 31,
1995 and $13.9 million at December 31, 1996. The increase of $12.1 million is
primarily due to the net proceeds from sales of the Company's Common Stock and
Warrants of $21.5 million partially offset by the use of $9.4 million for
operations for the year.
 
    Cash and cash equivalents used in the Company's operations increased from
$2.5 million for the nine months ended December 31, 1995, to $9.4 million for
the year ended December 31, 1996. This cash was used primarily to fund
increasing levels of research and development of clinical and preclinical
trials, the initial marketing and inventory purchases of the Company's first
four commercial products, and increased general and administrative expenses to
support these increased operations. The Company has not made significant outlays
for capital expenditures. The capital expenditures of $400,000 in 1996 were
substantially in support of increased marketing and administrative activities,
since much of the research and development activities are performed by outside
contractors. The increase in inventories has been financed principally by cash.
However, the Company anticipates that inventory levels of products on hand at
December 31, 1996, will decrease substantially in 1997 as the Company sells the
units on hand of the acquired Nipent-Registered Trademark- finished goods prior
to obtaining FDA approval of the Company's designated manufacturing facilities.
Should FDA approval be obtained in 1997, and manufacturing successfully
commence, the Company expects the cost per unit to be substantially less than
the unit cost of the purchased inventory. However, until that approval occurs,
if ever, or other sources are located, the Company's sales of
Nipent-Registered Trademark- will be limited to inventory on hand.
 
    Cash and cash equivalents provided by financing activities increased from
$2.3 million for the nine months ended December 31, 1995, to $22.0 million for
the year December 31, 1996, which was primarily due to the sale of 4,024,302
shares of Common Stock and Warrants to purchase an additional 4,024,302 shares
of Common Stock at an exercise price of $9.00 per share for total net proceeds
of $21.5 million in the Company's initial public offering. Interest income
increased to $750,000 in 1996 from $75,000 in 1995, due to larger invested cash
and cash equivalents balances following the initial public offering.
 
                                       25
<PAGE>
    The Company believes that the cash and cash equivalents on hand at December
31, 1996, are sufficient to meet its requirements through at least the next
twelve months, based on the Company's current operating plan. This plan includes
the effects of the payment of $500,000 by December 1997 related to the Company's
acquisition of Nipent-Registered Trademark-, as well as the acquisition of
finished goods and the abbreviated New Drug Application for Etoposide for $1.3
million in January 1997. (See notes 5 and 9 of the Notes to Consolidated
Financial Statements.) Although the Company has no material commitments for
capital expenditures at December 31, 1996, the Company anticipates capital
expenditures of approximately $2 million during 1997. The Company's current
operating plan shows that the Company will require substantial additional
capital not later than early 1998. Moreover, if the Company experiences
unanticipated cash requirements, the Company could require additional capital to
fund operations, continue research and development programs and preclinical and
clinical testing of its potential generic, Extra-TM- and proprietary products
and commercialize and market any products that may be developed. The Company may
seek such additional funding through public or private financings or
collaborative or other arrangements with third parties. The Company has no
credit facility or other committed sources of capital. There can be no assurance
that additional funds will be available on acceptable terms, if at all. See
"Management's Discussion and Analysis of Financial Condition and Results of
Operations--Factors Affecting Future Operating Results."
 
FACTORS AFFECTING FUTURE OPERATING RESULTS
 
    THE FOLLOWING DISCUSSION CONTAINS FORWARD-LOOKING STATEMENTS WITHIN THE
MEANING OF SECTION 27A OF THE SECURITIES ACT OF 1933, AS AMENDED, AND SECTION
21E OF THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED. THESE FORWARD-LOOKING
STATEMENTS REPRESENT THE COMPANY'S EXPECTATIONS OR BELIEFS CONCERNING FUTURE
EVENTS AND INCLUDE STATEMENTS, AMONG OTHERS, REGARDING THE TIMING AND PROGRESS
OF THE DEVELOPMENT OF THE COMPANY'S PROPOSED PRODUCTS, RECEIVING REGULATORY
APPROVALS, ACQUIRING ADDITIONAL PRODUCTS AND TECHNOLOGIES, SOURCING OF BULK
GENERICS AND THE MANUFACTURING OF FINISHED PRODUCTS, INCURRING OPERATING LOSSES
AND REQUIRING ADDITIONAL CAPITAL, REDUCING INVENTORY LEVELS AND COSTS PER UNIT,
AND INCURRING CAPITAL EXPENDITURES. ACTUAL RESULTS COULD DIFFER MATERIALLY FROM
THOSE PROJECTED IN THE FORWARD-LOOKING STATEMENTS AS A RESULT OF THE FAILURE TO
RECEIVE APPROPRIATE REGULATORY APPROVALS OF MARKETING OR MANUFACTURING
ACTIVITIES ON A TIMELY BASIS, LACK OF MARKET ACCEPTANCE OF AND DEMAND FOR THE
COMPANY'S PRODUCTS, INTENSE PRICE OR PRODUCT COMPETITION, LACK OF AVAILABLE
SUPPLY OF BULK GENERICS, FAILURE TO SELL EXISTING INVENTORIES AT PRICES
SUFFICIENT TO COVER RELATED COSTS, FAILURE TO OBTAIN ADDITIONAL FINANCING AND
OTHER FACTORS SET FORTH BELOW AND ELSEWHERE IN THIS REPORT.
 
    HISTORY OF OPERATING LOSSES; FUTURE PROFITABILITY UNCERTAIN.  Since its
inception in 1991 through December 31, 1996, the Company incurred losses of
approximately $24.3 million (including non-cash charges of approximately $4.9
million for the acquisition of in-process research and development),
substantially all of which consisted of research and development and general and
administrative expenses. Although the Company acquired the right to distribute
four products in the third quarter of 1996 and an additional product in the
first quarter of 1997, sales of these products have been minimal to date, and
there can be no assurance that such sales will exceed the related product and
selling expenses due to the intense competition and potential for significant
selling price and gross margin erosion. The Company expects to continue to incur
substantial operating losses. The Company's ability to achieve a profitable
level of operations in the future will depend in large part on its completing
product development and obtaining regulatory approval of its proprietary
(including Extra-TM-) products, and bringing several of these products to
market. The likelihood of the long-term success of the Company must be
considered in light of the expenses, difficulties and delays frequently
encountered in the development and commercialization of new pharmaceutical
products, competition, as well as the burdensome regulatory environment in which
the Company operates. There can be no assurance that the Company will ever
achieve significant revenues or profitable operations.
 
    GENERIC AND EXTRA-TM- PHARMACEUTICAL PRODUCT DEVELOPMENT.  The Company's
success is dependent upon the successful commercialization of its potential
generic and Extra-TM- products. However, there can be
 
                                       26
<PAGE>
no assurance that government approvals will be obtained or, if obtained, that
the Company will successfully commercialize its generic or Extra-TM- products.
While the Company has obtained bulk source approvals from the FDA for certain of
its generic and Extra-TM- products, it has yet to receive marketing approval for
any of its internally developed products, and there can be no assurance that any
such marketing approval will be obtained. As a result, there can be no assurance
that any of the Company's potential generic or Extra-TM- products will ever be
brought to market. In the event any of the Company's generic and Extra-TM-
products are brought to market, such products will face intense competition and
the potential for significant price and gross profit margin erosion.
 
    A significant number of products currently in development by the Company
consist of generic products for which patent protection has expired. Both the
price at which the Company can expect to sell such products and the volume of
any such sales are expected to depend to a significant degree on the number of
competitors at any time. There can be no assurance that the prices or volumes
achieved by the Company for any such products will meet the Company's
expectations that formed the basis for its decision to proceed with development
or will justify production of such products.
 
    EARLY STAGE OF DEVELOPMENT OF PROPRIETARY PRODUCTS; UNCERTAINTY OF FINAL
PRODUCT DEVELOPMENT.  While the Company's proposed proprietary products are in
the development rather than the research stage, significant development remains
prior to the time any of these proposed products may be brought to market. The
Company believes that results obtained to date in its preclinical and pilot
clinical studies support further development of its potential proprietary
products, but are not necessarily indicative of results that will be obtained in
further testing, including controlled human clinical testing. All of the
potential proprietary products currently under development by the Company will
require extensive clinical testing prior to submission of any regulatory
application for commercial use. Such proposed proprietary products as well as
the Company's proposed generic and Extra-TM- products are subject to the risks
of failure inherent in the development of pharmaceutical products, including the
possibilities that some of the Company's potential products will be found to be
unsafe or ineffective or otherwise fail to receive necessary regulatory
clearances; that the products, if safe and effective, will be difficult to
manufacture on a large scale or uneconomical to market; that the proprietary
rights of third parties will preclude the Company from marketing such products;
or that third parties will market superior or equivalent products. As a result,
there can be no assurance that any of the Company's products will be
successfully developed, receive required governmental regulatory approvals,
become commercially viable or achieve market acceptance.
 
    ADDITIONAL FINANCING REQUIREMENTS.  The Company's need for additional
funding is expected to be substantial and will be determined by the progress and
cost of the development and commercialization of its products and other
activities. Based on the Company's current operating plan, additional funds will
be needed after approximately twelve months. Moreover, if the Company
experiences unanticipated cash requirements during the interim period, the
Company could require additional funds much sooner. The source, availability and
terms of such funding have not been determined. Although funds may be received
from the sale of equity securities or the exercise of outstanding warrants and
options to acquire common stock of the Company, there is no assurance any such
funding will occur. Failure to obtain adequate financing in a timely manner
would have a material adverse effect on the Company's business, results of
operations and cash flows.
 
    NEED TO COMPLY WITH GOVERNMENTAL REGULATION AND TO OBTAIN PRODUCT
APPROVALS.  The research, testing, manufacture, labeling, distribution,
marketing and advertising of products such as the Company's existing and
proposed products and its ongoing research and development activities are
subject to extensive regulation by governmental regulatory authorities in the
U.S. and other countries. The FDA and comparable agencies in foreign countries
impose substantial requirements on the introduction of new pharmaceutical
products through lengthy and detailed clinical testing procedures, sampling
activities and other costly and time consuming compliance procedures. The
Company's generic drugs require approval of
 
                                       27
<PAGE>
the bulk source of the drug and FDA approval of the final formulation. The
Company's proposed Extra-TM- drugs require the approvals required for a generic
drug but will further require additional preclinical and clinical testing
relating to the proposed new formulation of the Extra-TM- drug. The Company's
proprietary nongeneric drugs require substantial clinical trials and FDA review
as new drugs. The Company cannot predict with certainty when it might submit
many of its proprietary nongeneric products currently under development for
regulatory review. Once the Company submits its potential products for review,
there can be no assurance that FDA or other regulatory approvals for any
pharmaceutical products developed by the Company will be granted on a timely
basis or at all. A delay in obtaining or failure to obtain such approvals would
have a material adverse effect on the Company's business, results of operations
and cash flows. Failure to comply with regulatory requirements could subject the
Company to regulatory or judicial enforcement actions, including, but not
limited to, product recalls or seizures, injunctions, civil penalties, criminal
prosecution, refusals to approve new products and withdrawal of existing
approvals, as well as potentially enhanced product liability exposure. Sales of
the Company's products outside the U.S. will be subject to regulatory
requirements governing clinical trials and marketing approval. These
requirements vary widely from country to country and could delay introduction of
the Company's products in those countries.
 
    PATENTS AND PROPRIETARY TECHNOLOGY.  The Company actively pursues a policy
of seeking patent protection for its proprietary products and technologies. The
Company has licenses to or assignments of numerous issued U.S. patents. However,
there can be no assurance that the Company's patent position will provide it
with significant protection against competitors. Litigation could be necessary
to protect the Company's patent position, and there can be no assurance that the
Company will have the required resources to pursue such litigation or otherwise
to protect its patent rights. In addition to pursuing patent protection in
appropriate cases, the Company also relies on trade secret protection for its
unpatented proprietary technology. However, trade secrets are difficult to
protect. There can be no assurance that others will not independently develop
substantially equivalent proprietary information and techniques or otherwise
gain access to the Company's trade secrets, that such trade secrets will not be
disclosed or that the Company can effectively protect its rights to unpatented
trade secrets.
 
    The Company's rights to its potential proprietary products are dependent
upon compliance with certain licenses and agreements which require, among other
things, certain royalty and other payments, the Company reasonably exploiting
the underlying technology of the applicable patents, as well as compliance with
certain regulatory filings. Failure to comply with such licenses and agreements
could result in loss of the Company's underlying rights to one or more of these
potential products, which would have a material adverse effect on the Company's
business, results of operations and cash flows.
 
    There can be no assurance that claims against the Company will not be raised
in the future based on patents held by others or that, if raised, such claims
will not be successful. Such other persons could bring legal actions against the
Company claiming damages and seeking to enjoin clinical testing, manufacturing
and marketing of the affected product. If any actions are successful, in
addition to any potential liability for damages, the Company could be required
to obtain a license in order to continue to manufacture or market the affected
product. There can be no assurance that the Company would prevail in any such
action or that any license required under any such patent would be made
available on acceptable terms, if at all. There has been, and the Company
believes that there will continue to be, significant litigation in the
pharmaceutical industry regarding patent and other intellectual property rights.
If the Company becomes involved in any litigation, it could consume a
substantial portion of the Company's resources regardless of the outcome of such
litigation.
 
    COMPETITION.  Competition in the area of pharmaceutical products is intense.
There are many companies, both public and private, including well-known
pharmaceutical companies, that are engaged in the development and sale of
products for certain of the applications being pursued by the Company. The
Company's competitors include Amgen, Chiron, Gensia, Bristol-Myers Squibb and
Immunex, among
 
                                       28
<PAGE>
others. Most of these companies have substantially greater financial, research
and development, manufacturing and marketing experience and resources than the
Company does and represent substantial long-term competition for the Company.
Such companies may succeed in developing pharmaceutical products that are more
effective or less costly than any that may be developed or marketed by the
Company.
 
    Factors affecting competition in the pharmaceutical industry vary depending
on the extent to which the competitor is able to achieve a competitive advantage
based on proprietary technology. If the Company is able to establish and
maintain a significant proprietary position with respect to its proprietary
products, competition will likely depend primarily on the effectiveness of the
product and the number, gravity and severity of its unwanted side effects as
compared to alternative products. Competition with respect to generic products
is based primarily on price and, to a lesser extent, on name recognition and the
reputation of the manufacturer in its target markets. Moreover, the number of
competitors offering a particular generic product can dramatically affect price
and gross margin for that product. The Company may be at a disadvantage in
competing with more established companies on the basis of price or market
reputation. In addition, increased competition in a particular generic market
would likely lead to significant price erosion which would have a negative
effect on the Company's potential gross profit margins. For example, the Company
believes that the total estimated U.S. sales for Mitomycin and Etoposide, as
well as other of the Company's proposed generic products, have decreased in
recent years due to increased competition and that sales for these generics may
continue to decrease in the future as a result of competitive factors, including
the introduction of additional generics as well as other cancer drugs, new
formulations for these drugs and the use of different therapies.
 
    The industry in which the Company competes is characterized by extensive
research and development efforts and rapid technological progress. Although the
Company believes that its proprietary position may give it a competitive
advantage with respect to its proposed non-generic drugs, new developments are
expected to continue and there can be no assurance that discoveries by others
will not render the Company's current and potential products noncompetitive. The
Company's competitive position also depends on its ability to attract and retain
qualified scientific and other personnel, develop effective proprietary
products, implement development and marketing plans, obtain patent protection
and secure adequate capital resources.
 
    LIMITED SUPPLY; MANUFACTURING LIMITATIONS.  The Company currently has a
limited supply of the products it is marketing. While the Company is seeking to
enter into manufacturing agreements to provide adequate supplies to meet market
demand, there is no assurance that the Company will be able to replenish its
supplies on a timely basis. Failure to obtain or retain third party
manufacturing capability or obtain necessary FDA approvals would have a material
adverse effect on the Company's revenues, results of operations and cash flows.
 
    The Company currently relies on foreign manufacturers for the production of
certain of its bulk generics and Extra-TM- formulations and on domestic
manufacturers to supply sufficient quantities of compounds to conduct clinical
trials on its proposed proprietary products. If the Company is unable to
contract for or obtain a sufficient supply of its potential pharmaceutical
products on acceptable terms, or such supplies are delayed or contaminated,
there could be significant delays in bringing the Company's proposed generic and
Extra-TM- products to market, as well as delays in the Company's preclinical and
human clinical testing schedule, and delays in submission of products for
regulatory approval and initiation of new development programs, any of which
could have a material adverse effect on the Company's business and results of
operations. If the Company should encounter delays or difficulties in
establishing relationships with manufacturers to produce, package and distribute
its finished pharmaceutical products, market introduction and subsequent sales
of such products would be adversely affected. Moreover, contract manufacturers
that the Company may use must adhere to current Good Manufacturing Practices
("cGMP") regulations enforced by the FDA through its facilities inspection
program. These facilities must pass a pre-approval plant inspection before the
FDA will issue a pre-market approval of the products. If the Company is unable
to obtain or retain third party manufacturing on commercially acceptable terms
or
 
                                       29
<PAGE>
obtain necessary FDA approvals to manufacture the products currently being sold,
it may not be able to commercialize pharmaceutical products as planned. The
Company's dependence upon third parties for the manufacture of pharmaceutical
products may adversely affect the Company's profit margins and its ability to
develop and deliver pharmaceutical products on a timely and competitive basis.
 
    The Company does not currently intend to manufacture any pharmaceutical
products itself, although it may choose to do so in the future. The Company has
no experience in the manufacture of pharmaceutical products in clinical
quantities or for commercial purposes. Should the Company determine to
manufacture products itself, the Company would be subject to the regulatory
requirements described above, would be subject to similar risks regarding delays
or difficulties encountered in manufacturing any such pharmaceutical products
and would require substantial additional capital. In addition, there can be no
assurance that the Company would be able to manufacture any such products
successfully and in a cost-effective manner.
 
    LIMITED EXPERIENCE.  The Company has only limited experience in procuring
products in commercial quantities, selling pharmaceutical products and
negotiating, setting up or maintaining strategic relationships and conducting
clinical trials and other late stage phases of the regulatory approval process.
There can be no assurance that the Company will successfully engage in any of
these activities. In addition, with respect to certain of the Company's proposed
products, such as the Company's obesity pill, the Company may seek to enter into
joint venture, sublicense or other marketing arrangements with another party
that has an established marketing capability. There can be no assurance that the
Company will be able to enter into any such marketing arrangements with third
parties, or that such marketing arrangements would be successful. In addition,
the Company has no current joint venture, strategic partnering or other similar
agreements with more established pharmaceutical companies, and there can be no
assurance that the Company could negotiate any such arrangements, on an
acceptable basis or at all, if it chose to do so. Accordingly, the viability of
the Company's proposed products has not been independently evaluated by any
independent pharmaceutical company.
 
    DEPENDENCE ON KEY PERSONNEL.  The Company's success is dependent on certain
key management and scientific personnel, including Dr. Joseph Rubinfeld, the
loss of whose services could significantly delay the achievement of the
Company's planned development objectives. The Company currently maintains a key
man life insurance policy in the amount of $2.6 million on Dr. Rubinfeld.
Competition for qualified personnel among pharmaceutical companies is intense,
and the loss of key personnel, or the inability to attract and retain the
additional, highly skilled personnel required for the expansion of the Company's
activities, could have a material adverse effect on the Company's business,
results of operations and cash flows.
 
    HEALTH CARE REFORM AND POTENTIAL LIMITATIONS ON THIRD-PARTY REIMBURSEMENT
RELATED MATTERS.  The levels of revenues and profitability of pharmaceutical
companies may be affected by the continuing efforts of governmental and
third-party payors to contain or reduce the costs of health care through various
means. The Company cannot predict the effect health care reforms may have on its
business, and there can be no assurance that any such reforms will not have a
material adverse effect on the Company. In addition, in both the U.S. and
elsewhere, sales of prescription pharmaceuticals are dependent in part on the
availability of reimbursement to the consumer from third-party payors, such as
government and private insurance plans. Third-party payors are increasingly
challenging the prices charged for medical products and services. There can be
no assurance that the Company's current and proposed products will be considered
cost effective and that reimbursement to the consumer will be available or will
be sufficient to allow the Company to sell its products on a competitive basis.
 
    RISK OF PRODUCT LIABILITY.  Clinical trials or marketing of any of the
Company's current and potential pharmaceutical products may expose the Company
to liability claims from the use of such pharmaceutical products. The Company
currently carries product liability insurance; however, there can be no
assurance that the Company will be able to maintain insurance on acceptable
terms for its clinical and commercial
 
                                       30
<PAGE>
activities or that such insurance would be sufficient to cover any potential
product liability claim or recall. Failure to have sufficient coverage could
have a material adverse effect on the Company's business and results of
operations.
 
    HAZARDOUS MATERIALS; ENVIRONMENTAL MATTERS.  The Company is subject to
federal, state and local laws and regulations governing the use, manufacture,
storage, handling and disposal of hazardous materials and certain waste
products. The Company currently maintains a supply of several hazardous
materials at the Company's facilities. While the Company currently outsources
its research and development programs involving the controlled use of
biohazardous materials, if in the future the Company conducts such programs
itself, there can be no assurance that the Company would not be required to
incur significant cost to comply with environmental laws and regulations. In the
event of an accident, the Company could be held liable for any damages that
result, and such liability could exceed the resources of the Company.
 
    ANTI-TAKEOVER EFFECTS OF CERTAIN CHARTER PROVISIONS.  Certain provisions of
the Company's Articles of Incorporation and Bylaws could discourage potential
acquisition proposals, could delay or prevent a change in control of the Company
and could make removal of management more difficult. Such provisions could
diminish the opportunities for a shareholder to participate in tender offers,
including tender offers that are priced above the then-current market value of
the Common Stock. The provisions may also inhibit increases in the market price
of the Common Stock and warrants that could result from takeover attempts. For
example, the Board of Directors of the Company, without further shareholder
approval, may issue up to 2,000,000 shares of Preferred Stock, in one or more
series, with such terms as the Board of Directors may determine, including
rights such as voting, dividend and conversion rights which could adversely
affect the voting power and other rights of the holders of Common Stock.
Preferred Stock thus may be issued quickly with terms calculated to delay or
prevent a change in control of the Company or make removal of management more
difficult. Additionally, the issuance of Preferred Stock may have the effect of
decreasing the market price of the Common Stock. The Company's Bylaws also
provide that so long as the Company has a class of stock registered pursuant to
the Securities Exchange Act of 1934, as amended (the "Exchange Act"),
shareholder action can be taken only at an annual or special meeting of
shareholders and may not be taken by written consent.
 
    CONTROL BY EXISTING SHAREHOLDERS.  The Company's officers, directors and
five-percent shareholders and their affiliates beneficially own approximately
56% of the Company's outstanding shares of Common Stock. Accordingly, these
shareholders, if they were to act as a group, may be able to elect all of the
Company's directors, and otherwise control matters requiring approval by the
shareholders of the Company, including approval of significant corporate
transactions. Such concentration of ownership and the lack of cumulative voting
may also have the effect of delaying or preventing a change in control of the
Company.
 
    POSSIBLE VOLATILITY OF COMMON STOCK PRICE.  The trading prices of the
Company's Common Stock and Warrants are subject to significant fluctuations in
response to such factors as, among others, variations in the Company's
anticipated or actual results of operations, announcements of new products or
technological innovations by the Company or its competitors and changes in
earnings estimates by analysts. Moreover, the stock market has from time to time
experienced extreme price and volume fluctuations which have particularly
affected the market prices for emerging growth companies and which have often
been unrelated to the operating performance of such companies. These broad
market fluctuations may adversely affect the market price of the Company's
Common Stock and Warrants. In the past, following periods of volatility in the
market price of a company's common stock, securities class action litigations
have occurred against the issuing company. There can be no assurance that such
litigation will not occur in the future with respect to the Company. Such
litigation could result in substantial costs and a diversion of management's
attention and resources, which could have a material adverse effect on the
Company's business and results of operations. Any adverse determination in such
litigation could also subject the Company to significant liabilities.
 
                                       31
<PAGE>
ITEM 8.  FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA.
 
    All information required by this item is included on pages [F-1] to [F-14]
in Item [14] of Part IV of this Report and is incorporated into this item by
reference.
 
ITEM 9.  CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING
       AND FINANCIAL DISCLOSURE.
 
    Not applicable.
 
                                    PART III
 
ITEM 10.  DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT.
 
    Information regarding the executive officers and directors of the Company is
incorporated by reference to the information set forth under the caption
"Proposal One: Election of Directors" in the Company's Proxy Statement for the
Annual Meeting of Shareholders to be filed with the Commission within 120 days
after the end of the Company's fiscal year ended December 31, 1996.
 
ITEM 11.  EXECUTIVE COMPENSATION.
 
    Information regarding executive compensation is incorporated by reference to
the information set forth under the caption "Executive Compensation" in the
Company's Proxy Statement for the Annual Meeting of Shareholders to be filed
with the Commission within 120 days after the end of the Company's fiscal year
ended December 31, 1996.
 
ITEM 12.  SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND
        MANAGEMENT.
 
    Information regarding security ownership of certain beneficial owners and
management is incorporated by reference to the information set forth under the
caption "Voting Securities of Principal Shareholders and Management" in the
Company's Proxy Statement for the Annual Meeting of Shareholders to be filed
with the Commission within 120 days after the end of the Company's fiscal year
ended December 31, 1996.
 
ITEM 13.  CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS.
 
    Information regarding certain relationships and related transactions is
incorporated by reference to the information set forth under the caption
"Executive Compensation--Certain Transactions" in the Company's Proxy Statement
for the Annual Meeting of Shareholders to be filed with the Commission within
120 days after the end of the Company's fiscal year ended December 31, 1996.
 
                                       32
<PAGE>
                                    PART IV
 
ITEM 14.  EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K.
 
        (a) The following documents are filed as part of this Report:
 
           1.  FINANCIAL STATEMENTS.  The following financial statements of the
       Company and the Report of Ernst & Young LLP, Independent Auditors, are
       included in Part IV of this Report on the pages indicated:
 
<TABLE>
<CAPTION>
                                                                                  PAGE
                                                                                  -----
<S>                                                                            <C>
Report of Ernst & Young LLP, Independent Auditors............................         F-1
Consolidated Balance Sheets..................................................         F-2
Consolidated Statements of Operations........................................         F-3
Consolidated Statement of Shareholders' Equity...............................         F-4
Consolidated Statements of Cash Flows........................................         F-5
Notes to Consolidated Financial Statements...................................         F-6
</TABLE>
 
           2.  FINANCIAL STATEMENT SCHEDULES.
 
<TABLE>
<CAPTION>
                                                                                  PAGE
                                                                                  -----
<S>                                                                            <C>
Schedule II--Valuation and Qualifying Accounts...............................         S-2
</TABLE>
 
    All other schedules are omitted because they are not applicable or the
required information is shown in the consolidated financial statements or the
notes thereto.
 
           3.  EXHIBITS:
 
<TABLE>
<CAPTION>
    EXHIBIT
    NUMBER       DESCRIPTION OF DOCUMENT
- ---------------  ---------------------------------------------------------------------------------------
<C>              <S>
        (a) 3.2  Restated Articles of Incorporation of the Registrant, as currently in effect.
 
        (b) 3.3  Bylaws, as amended, of the Registrant.
 
        (a)10.1  Form of Indemnification Agreement between the Registrant and each of its directors and
                   officers.
 
        (a)10.2  1993 Stock Plan, as amended and restated, and forms of stock option agreements
                   thereunder.
 
        (a)10.3  1996 Directors Stock Option Plan and form of stock option agreements thereunder.
 
        (a)10.4  Sublease Agreement dated March 25, 1991 between the Registrant and Jelly Bean Square, a
                   California general partnership, as amended.
 
        (a)10.5  Sublease Agreement dated June 29, 1993 between the Registrant and Jelly Bean Square, a
                   California general partnership, as amended.
 
        (a)10.6  Lease Agreement dated September 26, 1994 between the Registrant and Arthur J. Rogers &
                   Co., as amended.
 
     (b)(d)10.7  Patent Royalty Agreement dated June 30, 1992 between the Registrant and Progenics, Inc.
 
     (b)(d)10.8  Patent License and Royalty Agreement dated August 30, 1993 between the Registrant and
                   The Jackson Laboratory.
 
     (b)(d)10.9  Worldwide License Agreement dated March 1, 1994 between the Registrant and Janssen
                   Biotech, N.V.
</TABLE>
 
                                       33
<PAGE>
<TABLE>
<CAPTION>
    EXHIBIT
    NUMBER       DESCRIPTION OF DOCUMENT
- ---------------  ---------------------------------------------------------------------------------------
<C>              <S>
    (b)(d)10.10  Patent License Agreement dated March 1, 1994 between the Registrant and Cyclex Inc.
 
    (b)(d)10.11  Patent License and Royalty Agreement dated November 15, 1993 between the Registrant and
                   The Long Island Jewish Medical Center.
 
    (b)(d)10.12  License Agreement dated February 1, 1995 between the Registrant and Pharmos
                   Corporation.
 
       (b)10.13  Research and License Agreement dated August 1, 1993 between the Registrant and Amur
                   Research Corp.
 
       (b)10.14  Amended and Restated Stock Purchase Agreement dated May 30, 1995 between Israel
                   Chemicals, Ltd. and the Registrant and the related Amended and Restated Shareholders
                   Agreement dated June 2, 1995.
 
       (b)10.15  Employment, Confidential Information and Invention Assignment Agreement dated January
                   1, 1994 between the Registrant and Joseph Rubinfeld and form of amendment.
 
       (b)10.16  Employment, Confidential Information and Invention Assignment Agreement dated February
                   1, 1994 between the Registrant and Francis H. Lee.
 
       (b)10.17  Employment, Confidential Information and Invention Assignment Agreement dated February
                   1, 1994 between the Registrant and Frank Brenner.
 
       (b)10.19  Form of Consulting Agreement between the Registrant and J. Gregory Swendsen and David
                   M. Fineman.
 
       (b)10.20  Consulting Agreement between the Registrant and Vida International Pharmaceutical
                   Consultants.
 
       (c)10.21  Purchase and Sale Agreement dated as of September 30, 1996 between the Registrant and
                   Warner-Lambert Company, a Delaware corporation.
 
       (e)10.22  Asset Purchase Agreement dated January 15, 1997 between the Registrant and Immunex
                   Corporation, a Washington corporation.
 
          10.23  Standard Offer, Agreement and Escrow Instructions for Purchase of Real Estate
                   (Non-Residential) dated December 11, 1996 between the Registrant and The Ashwill
                   Trust, established November 8, 1989.
 
       (e)10.24  Bishop Ranch Business Park Building Lease dated October 14, 1996 between the Registrant
                   and Annabel Investment Company, a California partnership.
 
           23.1  Consent of Ernst & Young LLP, Independent Auditors.
 
           24.1  Power of Attorney (see page S-1).
</TABLE>
 
- ------------------------
 
(a) Incorporated by reference from the Registrant's Registration Statement on
    Form SB-2 (Reg. No. 33-476-LA). Except as noted, each exhibit listed is
    incorporated by reference to the exhibit of the same number.
 
(b) Incorporated by reference from Amendment No. 1 to the Registrant's
    Registration Statement on Form SB-2 (Reg. No. 33-476-LA). Except as noted,
    each exhibit listed is incorporated by reference to the exhibit of the same
    number.
 
(c) Incorporated by reference from the Registrant's Report on Form 8-K filed
    with the Securities and Exchange Commission on October 15, 1996. The exhibit
    listed is incorporated by reference to Exhibit 2.1 of Registrant's Report on
    Form 8-K.
 
                                       34
<PAGE>
(d) Confidential treatment has been previously granted for certain portions of
    these exhibits.
 
(e) Confidential treatment requested for certain portions of this exhibit.
 
        (b) REPORTS ON FORM 8-K.
 
            (1) Form 8-K dated September 30, 1996, filed on October 15, 1996.
 
        (c) EXHIBITS.  See Item 14(a) above.
 
        (d) FINANCIAL STATEMENT SCHEDULES.  See Item 14(a) above.
 
                                       35
<PAGE>
               REPORT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS
 
Board of Directors and Shareholders
 
SuperGen, Inc.
 
    We have audited the accompanying consolidated balance sheets of SuperGen,
Inc. as of December 31, 1996 and 1995, and the related consolidated statements
of operations, shareholders' equity, and cash flows for the year ended December
31, 1996, the nine months ended December 31, 1995, the year ended March 31,
1995, and the period from March 1, 1991 (inception) through December 31, 1996.
Our audits also included the financial statement schedule listed in the Index at
Item 14(a). These financial statements and schedule are the responsibility of
the Company's management. Our responsibility is to express an opinion on these
financial statements and schedule based on our audits.
 
    We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
    In our opinion, the financial statements referred to above present fairly,
in all material respects, the consolidated financial position of SuperGen, Inc.
at December 31, 1996 and 1995 and the consolidated results of its operations and
its cash flows for the year ended December 31, 1996, the nine months ended
December 31, 1995, the year ended March 31, 1995, and the period from March 1,
1991 (inception) through December 31, 1996, in conformity with generally
accepted accounting principles. Also, in our opinion, the related financial
statement schedule, when considered in relation to the basic financial
statements taken as a whole, presents fairly in all material respects the
information set forth therein.
 
                                          /s/  ERNST & YOUNG LLP
 
Palo Alto, California
January 15, 1997, except as to the third
paragraph of Note 2 as to which the
date is January 24, 1997
 
                                      F-1
<PAGE>
                                 SUPERGEN, INC.
                         (A DEVELOPMENT STAGE COMPANY)
 
                          CONSOLIDATED BALANCE SHEETS
 
<TABLE>
<CAPTION>
                                                                                             DECEMBER 31,
                                                                                    ------------------------------
                                                                                         1996            1995
                                                                                    --------------  --------------
<S>                                                                                 <C>             <C>
                                                      ASSETS
Current assets:
  Cash and cash equivalents.......................................................  $   13,914,863  $    1,815,420
  Accounts receivable, net of allowances of $72,400...............................         120,440        --
  Inventories.....................................................................       1,573,951        --
  Prepaid expenses and other current assets.......................................         540,376         134,452
                                                                                    --------------  --------------
        Total current assets......................................................      16,149,630       1,949,872
Property and equipment, at cost:
  Research and development equipment..............................................          83,546          81,894
  Office furniture, fixtures and equipment........................................         517,859         148,932
  Leasehold improvements..........................................................          53,578          47,208
                                                                                    --------------  --------------
                                                                                           654,983         278,034
  Less accumulated depreciation and amortization..................................         243,500         127,713
                                                                                    --------------  --------------
    Net property and equipment....................................................         411,483         150,321
Developed technology, net of amortization of $3,317...............................       1,266,683        --
Other assets......................................................................          45,620          61,390
                                                                                    --------------  --------------
        Total assets..............................................................  $   17,873,416  $    2,161,583
                                                                                    --------------  --------------
                                                                                    --------------  --------------
 
                                       LIABILITIES AND SHAREHOLDERS' EQUITY
Current liabilities:
  Accounts payable................................................................  $      836,534  $      223,828
  Clinical trials accrual.........................................................         205,620        --
  Accrued compensation and related expenses.......................................         290,350          81,016
  Due to related parties..........................................................         334,074         205,750
  Amount due under asset purchase agreement.......................................         500,000        --
                                                                                    --------------  --------------
        Total current liabilities.................................................       2,166,578         510,594
 
Commitments and contingency
 
Shareholders' equity:
  Preferred stock, $.001 par value; 2,000,000 shares authorized; none
    outstanding...................................................................        --              --
  Common stock, $.001 par value; 40,000,000 shares authorized; 16,930,292 and
    12,752,427 shares issued and outstanding at December 31, 1996 and 1995,
    respectively..................................................................      40,026,551      17,213,067
  Deficit accumulated during the development stage................................     (24,319,713)    (15,562,078)
                                                                                    --------------  --------------
        Total shareholders' equity................................................      15,706,838       1,650,989
                                                                                    --------------  --------------
        Total liabilities and shareholders' equity................................  $   17,873,416  $    2,161,583
                                                                                    --------------  --------------
                                                                                    --------------  --------------
</TABLE>
 
                            See accompanying notes.
 
                                      F-2
<PAGE>
                                 SUPERGEN, INC.
                         (A DEVELOPMENT STAGE COMPANY)
 
                     CONSOLIDATED STATEMENTS OF OPERATIONS
 
<TABLE>
<CAPTION>
                                                                                                    PERIOD FROM
                                                                                                   MARCH 1, 1991
                                                                      NINE MONTHS                   (INCEPTION)
                                                       YEAR ENDED        ENDED       YEAR ENDED       THROUGH
                                                      DECEMBER 31,   DECEMBER 31,     MARCH 31,     DECEMBER 31,
                                                          1996           1995           1995            1996
                                                      -------------  -------------  -------------  --------------
<S>                                                   <C>            <C>            <C>            <C>
Net sales...........................................  $     225,962  $    --        $    --        $      225,962
Grant revenues......................................         37,715       --             --                37,715
Contract revenues from related party................       --               12,574        168,628         181,202
                                                      -------------  -------------  -------------  --------------
Total revenues......................................        263,677         12,574        168,628         444,879
Operating expenses:
  Cost of sales.....................................        282,777       --             --               282,777
  Research and development..........................      6,593,590      2,173,332      2,986,202      15,251,632
  Sales and marketing...............................        982,168        160,966        197,760       1,535,839
  General and administrative........................      1,912,279        482,280        734,968       3,803,285
  Non-cash charges for acquisition of in-process
    research and development........................       --             --             --             4,867,645
                                                      -------------  -------------  -------------  --------------
Total operating expenses............................      9,770,814      2,816,578      3,918,930      25,741,178
                                                      -------------  -------------  -------------  --------------
Loss from operations................................     (9,507,137)    (2,804,004)    (3,750,302)    (25,296,299)
Interest income.....................................        749,502         75,317        111,355         976,586
                                                      -------------  -------------  -------------  --------------
Net loss............................................  $  (8,757,635) $  (2,728,687) $  (3,638,947) $  (24,319,713)
                                                      -------------  -------------  -------------  --------------
                                                      -------------  -------------  -------------  --------------
Net loss per share..................................  $       (0.55) $       (0.22) $       (0.31)
                                                      -------------  -------------  -------------
                                                      -------------  -------------  -------------
Shares used in net loss per share calculation.......     15,960,872     12,628,982     11,907,593
                                                      -------------  -------------  -------------
                                                      -------------  -------------  -------------
</TABLE>
 
                            See accompanying notes.
 
                                      F-3
<PAGE>
                                 SUPERGEN, INC.
                         (A DEVELOPMENT STAGE COMPANY)
 
                 CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY
 
<TABLE>
<CAPTION>
                                                                                       DEFICIT
                                                                                     ACCUMULATED
                                                              COMMON STOCK            DURING THE        TOTAL
                                                       ---------------------------   DEVELOPMENT    SHAREHOLDERS'
                                                          SHARES        AMOUNT          STAGE          EQUITY
                                                       ------------  -------------  --------------  -------------
<S>                                                    <C>           <C>            <C>             <C>
  Founder capital contribution in 1991...............     6,500,000  $       6,500  $     --        $       6,500
  Issuance of common stock to investors for cash in
    1993 and 1994....................................       305,500        652,500        --              652,500
  Issuance of common stock to consultants for
    services in 1993.................................        10,000          1,000        --                1,000
  Exercise of stock options by employees and
    consultants for cash or services in 1993 and
    1994.............................................        59,000         10,645        --               10,645
  Issuance of common stock for cash and in-process
    research and development from affiliated limited
    partnerships in 1994.............................     2,720,127      7,060,381        --            7,060,381
  Issuance of common stock for cash to Israel
    Chemicals, Ltd., net of offering costs of
    $304,502 in 1994.................................     1,150,000      3,145,498        --            3,145,498
  Net loss through March 31, 1994....................       --            --            (9,194,444)    (9,194,444)
                                                       ------------  -------------  --------------  -------------
Balances at March 31, 1994...........................    10,744,627     10,876,524      (9,194,444)     1,682,080
  Issuance of common stock for cash to Israel
    Chemicals, Ltd...................................     1,330,000      3,990,000        --            3,990,000
  Net loss...........................................       --            --            (3,638,947)    (3,638,947)
                                                       ------------  -------------  --------------  -------------
Balances at March 31, 1995...........................    12,074,627     14,866,524     (12,833,391)     2,033,133
  Issuance of common stock for cash to Israel
    Chemicals, Ltd...................................       500,000      1,500,000        --            1,500,000
  Issuance of common stock and warrants for cash, net
    of offering costs of $42,457.....................       177,800        846,543        --              846,543
  Net loss...........................................       --            --            (2,728,687)    (2,728,687)
                                                       ------------  -------------  --------------  -------------
Balances at December 31, 1995........................    12,752,427     17,213,067     (15,562,078)     1,650,989
  Issuance of common stock and warrants for cash.....        26,800        134,000        --              134,000
  Issuance of common stock and warrants in connection
    with the initial public offering, net of offering
    costs of $2,615,052..............................     4,024,302     21,530,760        --           21,530,760
  Issuance of common stock upon exercise of warrants
    and stock options................................        54,950        325,524        --              325,524
  Issuance of common stock for acquisition of
    developed technology.............................        71,813        700,000        --              700,000
  Compensation expense from grant of options to
    vendors and acceleration of option vesting.......       --             123,200        --              123,200
  Net loss...........................................       --            --            (8,757,635)    (8,757,635)
                                                       ------------  -------------  --------------  -------------
Balances at December 31, 1996........................    16,930,292  $  40,026,551  $  (24,319,713) $  15,706,838
                                                       ------------  -------------  --------------  -------------
                                                       ------------  -------------  --------------  -------------
</TABLE>
 
                            See accompanying notes.
 
                                      F-4
<PAGE>
                                 SUPERGEN, INC.
                         (A DEVELOPMENT STAGE COMPANY)
 
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
 
<TABLE>
<CAPTION>
                                                                                                    PERIOD FROM
                                                                                                   MARCH 1, 1991
                                                                      NINE MONTHS                   (INCEPTION)
                                                       YEAR ENDED        ENDED       YEAR ENDED       THROUGH
                                                      DECEMBER 31,   DECEMBER 31,     MARCH 31,     DECEMBER 31,
                                                          1996           1995           1995            1996
                                                      -------------  -------------  -------------  --------------
<S>                                                   <C>            <C>            <C>            <C>
OPERATING ACTIVITIES
Net loss............................................  $  (8,757,635) $  (2,728,687) $  (3,638,947) $  (24,319,713)
Adjustments to reconcile net loss to net cash used
  in operating activities:
  Depreciation and amortization.....................        119,104         41,827         48,775         248,980
  Non-cash charges for acquisition of in-process
    research and development........................       --             --             --             4,867,645
  Stock options granted to vendors..................        123,200       --             --               123,200
  Changes in operating assets and liabilities:
    Accounts receivable.............................       (120,440)      --             --              (120,440)
    Inventory.......................................     (1,573,951)      --             --            (1,573,951)
    Prepaid expenses and other current assets.......       (405,924)        77,598       (152,779)       (540,376)
    Other assets....................................         15,770        (35,233)        (5,644)        (45,620)
    Accounts payable and other accrued
      liabilities...................................        822,040       (102,137)       (20,960)      1,126,884
    Clinical trials accrual.........................        205,620       --             --               205,620
    Due to related parties..........................        128,324        205,750       --               334,074
                                                      -------------  -------------  -------------  --------------
Net cash used in operating activities...............     (9,443,892)    (2,540,882)    (3,769,555)    (19,693,697)
 
INVESTING ACTIVITIES
Purchase of property and equipment, net.............       (376,949)        (4,547)       (99,553)       (657,146)
Acquisition of developed technology.................        (70,000)      --             --               (70,000)
                                                      -------------  -------------  -------------  --------------
Net cash used in investing activities...............       (446,949)        (4,547)       (99,553)       (727,146)
 
FINANCING ACTIVITIES
Issuance of common stock and warrants...............     21,990,284      2,346,543      3,990,000      32,248,961
Contract research funding from affiliated
  partnerships......................................       --             --             --             2,086,745
                                                      -------------  -------------  -------------  --------------
Net cash provided by financing activities...........     21,990,284      2,346,543      3,990,000      34,335,706
                                                      -------------  -------------  -------------  --------------
Net increase (decrease) in cash and cash
  equivalents.......................................     12,099,443       (198,886)       120,892      13,914,863
Cash and cash equivalents at beginning of period....      1,815,420      2,014,306      1,893,414        --
                                                      -------------  -------------  -------------  --------------
Cash and cash equivalents at end of period..........  $  13,914,863  $   1,815,420  $   2,014,306  $   13,914,863
                                                      -------------  -------------  -------------  --------------
                                                      -------------  -------------  -------------  --------------
</TABLE>
 
                            See accompanying notes.
 
                                      F-5
<PAGE>
                                 SUPERGEN, INC.
 
                         (A DEVELOPMENT STAGE COMPANY)
 
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
DESCRIPTION OF BUSINESS
 
    SuperGen, Inc. (the "Company"), which was incorporated in California in
March 1991, is a development stage pharmaceutical company that is dedicated to
the acquisition, development and commercialization of products to treat
life-threatening diseases, particularly cancer and blood cell (hematological)
disorders and other serious conditions such as obesity. The Company began
marketing acquired products in late 1996 and is developing its portfolio of
drugs, many of which are proprietary. The Company is also developing a group of
proprietary blood cell disorder products for the treatment of anemia associated
with renal failure, chemotherapy, radiotherapy, and aplastic anemia. The
Company's proprietary obesity pill, which is being developed for chronic genetic
obesity and general obesity, is in Phase II clinical studies.
 
    By resolution of the Company's Board of Directors, effective January 17,
1996, the Company's fiscal year end was changed from March 31 to December 31.
 
PRINCIPLES OF CONSOLIDATION
 
    The consolidated financial statements include the accounts of a wholly-owned
Israeli subsidiary, Rubicon Pharmaceuticals, Ltd., formed in June 1996. The
result of the subsidiary's operations to date have been immaterial.
 
USE OF ESTIMATES
 
    The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the amounts reported in the financial statements and
accompanying notes. Actual results could differ from those estimates.
 
REVENUE RECOGNITION
 
    Revenues related to pharmaceutical product sales are recognized upon
shipment to customers. Product sales are made principally to clinics, drug
distributors and hospitals in the United States. The Company does not require
collateral from its customers.
 
    Contract revenues are related to research performed on behalf of Israel
Chemicals, Ltd., a shareholder. Contract revenues and grant revenues generally
relate to the reimbursement of costs incurred for research and development as
specified in the related agreements and are recorded as earned.
 
CASH AND CASH EQUIVALENTS
 
    Cash and cash equivalents include bank demand deposits and an interest in a
money market fund which invests primarily in U.S. government obligations and
commercial paper. These investments are highly liquid and are subject to
insignificant risk. The Company has not experienced any realized or unrealized
gains or losses related to these investments. The Company has classified its
investments in money market funds as available-for-sale.
 
INVENTORIES
 
    Inventories are stated at the lower of cost (using first-in, first-out
method) or market value.
 
                                      F-6
<PAGE>
                                 SUPERGEN, INC.
 
                         (A DEVELOPMENT STAGE COMPANY)
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
PROPERTY AND EQUIPMENT
 
    Property and equipment are stated at cost and are depreciated over their
estimated useful lives, using the straight-line method. Leasehold improvements
are amortized over the shorter of the life of the lease or their estimated
useful lives using the straight-line method.
 
DEVELOPED TECHNOLOGY
 
    Developed technology is being amortized to cost of sales on a units-sold
basis over a period expected to approximate six years.
 
NET LOSS PER SHARE
 
    Net loss per share is computed using the weighted average number of shares
of common stock outstanding during each period. Common equivalent shares
issuable upon the exercise of outstanding options and warrants to purchase
shares of the Company's common stock (using the treasury stock method) have been
excluded from the computation because their impact is antidilutive. In
accordance with Securities and Exchange Commission Staff Accounting Bulletins,
common and common equivalent shares issued by the Company at prices below the
public offering price during the period beginning one year prior to the initial
filing of the registration statement for the Company's initial public offering
have been included in the calculation as if they were outstanding for all
periods presented (using the treasury stock method and the initial public
offering price).
 
STOCK-BASED COMPENSATION
 
    In October 1995, the Financial Accounting Standards Board issued Statement
No. 123, "Accounting for Stock-Based Compensation," which is effective for 1996.
As permitted by Statement No. 123, the Company accounts for stock options under
the provisions of Accounting Principles Board Opinion No. 25, "Accounting for
Stock Issued to Employees." Accordingly, the Company does not record
compensation expense for stock option grants when the exercise price equals or
exceeds the market price of the Company's common stock on the date of grant.
 
RECLASSIFICATIONS
 
    Certain prior year amounts have been reclassified to conform to the current
year's presentation.
 
2. RELATED PARTY TRANSACTIONS
 
    The Company entered into consulting agreements with two shareholders, both
of whom are directors of the Company. Payments under these agreements totaled
$127,000 for the year ended December 31, 1996, $91,000 for the nine months ended
December 31, 1995, and $160,000 for the year ended March 31, 1995, all of which
are included in general and administrative expenses in the accompanying
statements of operations.
 
    Three shareholders and directors are directors of a company conducting
research and development work partially funded by SuperGen. SuperGen has
provided approximately $248,000 in research funding for the year ended December
31, 1996, $182,000 during the nine months ended December 31, 1995 and
 
                                      F-7
<PAGE>
                                 SUPERGEN, INC.
 
                         (A DEVELOPMENT STAGE COMPANY)
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
2. RELATED PARTY TRANSACTIONS (CONTINUED)
$300,000 for the year ended March 31, 1995. In addition, SuperGen holds an 11%
ownership interest in this company at December 31, 1996, which is carried at no
value.
 
    At December 31, 1995, the Company owned 5% of another company performing
research and development work for SuperGen as well as selling SuperGen certain
research supplies. Research payments to this company totaled $287,000 for the
year ended December 31, 1996, $131,250 for the nine months ended December 31,
1995, and $288,000 for the year ended March 31, 1995. Amounts due of $175,000
and $62,500 at December 31, 1996 and 1995, respectively, are included in "Due to
related parties" in the accompanying balance sheets. SuperGen acquired an
additional 5% ownership interest in this company on January 24, 1997, for
$150,000. The Company's entire investment is carried at no value.
 
    Four directors and shareholders are directors and shareholders of another
company performing research for SuperGen in Israel. Payments to this company
totaled $43,500 for the year ended December 31, 1996, $-- for the nine months
ended December 31, 1995 and $-- for the year ended March 31, 1995. Amounts due
of $156,500 and $-- at December 31, 1996 and 1995 respectively, are included in
"Due to related parties" in the accompanying balance sheets.
 
    Two directors and a shareholder are directors of a privately held
development stage biopharmaceutical company. In November 1996, the Company paid
$250,000 for approximately 4% of the ownership interest in this company, which
is carried at no value. The companies have agreed to enter into a strategic
collaboration aimed at the discovery and development of new anticancer drugs
based on natural products.
 
    In connection with the resignation of one of its officers and founders, the
Company recorded $187,500 in general and administrative expenses in the
accompanying statement of operations for the nine months ended December 31,
1995, of which $131,250 was included in "Due to related parties" as of December
31, 1995 and paid in 1996.
 
    Certain shareholders and founders of the Company were also general partners
in two research and development partnerships. These partnerships were formed to
finance the research and development of certain generic drugs. The partnerships
subsequently entered into research and development agreements with SuperGen to
perform specified research and development activities. In May 1993 and January
1994, the Company purchased all of the technology under development by both of
these partnerships (Note 3).
 
3. SHAREHOLDERS' EQUITY
 
COMMON STOCK
 
    In May 1993, the Company issued 1.1 million shares of common stock to the
general and limited partners of an affiliated research and development
partnership in exchange for the rights to technology currently under development
and cash of $570,000. The Company's founders and shareholders were general
partners in the partnership. In connection with this transaction, the Company
recorded a charge to operations of $1.1 million for the acquisition of
in-process research and development.
 
    In January 1994, the Company acquired technology under development by
another affiliated research and development partnership in exchange for 1.6
million shares of common stock and a net cash payment of $470,000. The Company's
founders and shareholders were general partners in the partnership. The Company
recorded another charge to operations totaling $3.8 million in connection with
the acquisition of this in-process research and development.
 
                                      F-8
<PAGE>
                                 SUPERGEN, INC.
 
                         (A DEVELOPMENT STAGE COMPANY)
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
3. SHAREHOLDERS' EQUITY (CONTINUED)
    In March 1996, the Company completed an initial public offering and issued
3,500,000 shares of common stock, raising net proceeds of approximately $18.6
million. Additional net proceeds of approximately $2.9 million were received in
April 1996 from the exercise of the underwriters' overallotment option.
 
WARRANTS
 
    At December 31, 1996, warrants to purchase the following shares of the
Company's common stock were outstanding:
 
<TABLE>
<CAPTION>
NUMBER OF SHARES   EXERCISE PRICE    ISSUE DATE     EXPIRATION DATE
- -----------------  ---------------  -------------  -----------------
<S>                <C>              <C>            <C>
       203,600        $    5.00            1995             2000
     4,003,802             9.00            1996             2001
       350,000             7.20            1996             2001
</TABLE>
 
    In addition, upon exercise, the holders of the warrants to purchase 350,000
shares will receive an additional warrant to acquire 350,000 shares at $9.00 per
share, which warrant will expire in 2001. The $5.00 and $9.00 warrants are
redeemable by the Company for $0.25 upon thirty days written notice, if the
closing bid price exceeds $10.00 and $18.00, respectively, for specified periods
of time. The Company has reserved 203,600 shares of common stock for issuance
upon exercise of the $5.00 warrants.
 
4. STOCK OPTION PLANS
 
    The Company has elected to follow Accounting Principles Board Opinion No.
25, "Accounting for Stock Issued to Employees" (APB 25) and related
Interpretations in accounting for its employee stock options because, as
discussed below, the alternative fair value accounting provided for under FASB
Statement No. 123, "Accounting for Stock-Based Compensation," requires use of
option valuation models that were not developed for use in valuing employee
stock options. Under APB 25, because the exercise price of the Company's
employee and director stock options equals the market price of the underlying
stock on the date of grant for all options granted, no compensation expense has
been recognized. The fair value of the options granted to vendors and certain
consultants, amounting to $123,200 in 1996, is expensed as earned.
 
    The Company has established stock option plans, and 2,550,000 shares of
common stock have been authorized for issuance upon the grant of incentive stock
options or nonstatutory stock options to employees, directors, and consultants.
The number of shares to be purchased, their price, and the terms of payment are
determined by the Company's Board of Directors, provided that the exercise price
for incentive stock options cannot be less than the fair market value on the
date of grant. The options granted generally expire ten years after the date of
grant and become exercisable at such times and under such conditions as
determined by the Board of Directors (generally over a four or five year
period). At December 31, 1996, the Company has reserved 2,216,550 shares of
common stock for future issuance in connection with stock option plans.
 
    Pro forma information regarding net loss and net loss per share is required
by Statement 123 and has been determined as if the Company had accounted for its
employee stock options under the fair value
 
                                      F-9
<PAGE>
                                 SUPERGEN, INC.
 
                         (A DEVELOPMENT STAGE COMPANY)
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
4. STOCK OPTION PLANS (CONTINUED)
method of that Statement. The fair value for these options was estimated at the
date of grant using the Black-Scholes option pricing model with the following
weighted-average assumptions for 1996: a risk-free interest rate of 6.02%; no
dividend yield; a volatility factor of the expected market price of the
Company's common stock of 0.712; and an expected life of the options of 8.6
years. The minimum value method was used for grants made prior to the date of
the initial filing of the registration statement for the Company's initial
public offering.
 
    The Black-Scholes option valuation model was developed for use in estimating
the fair value of traded options which have no vesting requirements and are
fully transferable. In addition, option valuation models require the input of
highly subjective assumptions including the expected stock price volatility.
Because the Company's employee stock options have characteristics significantly
different from those of traded options, and because changes in the subjective
input assumptions can materially affect the fair value estimate, in management's
opinion, the existing models do not necessarily provide a reliable single
measure of the fair value of its employee stock options.
 
    For purposes of pro forma disclosures, the estimated fair value of the
options is amortized to expense over the options' vesting period. The Company's
pro forma information follows:
 
<TABLE>
<CAPTION>
                                                            YEAR ENDED      NINE MONTHS ENDED
                                                         DECEMBER 31, 1996  DECEMBER 31, 1995
                                                         -----------------  -----------------
<S>                                                      <C>                <C>
Pro forma net loss.....................................   $   (10,292,557)    $  (3,013,306)
Pro forma loss per share...............................   $         (0.64)    $       (0.24)
</TABLE>
 
    As the Company adopted Statement No. 123 in 1996, it has only reflected the
pro forma effect on net loss for options granted after March 31, 1995.
Accordingly, the effects of applying Statement No. 123 for providing pro forma
disclosures are not indicative of future amounts until the Statement has been
applied to all outstanding, non vested awards.
 
    A summary of the Company's stock option activity and related information for
1996 follows:
 
<TABLE>
<CAPTION>
                                                                                                        WEIGHTED-
                                                                                                         AVERAGE
                                                                                         OPTIONS     EXERCISE PRICE
                                                                                       ------------  ---------------
<S>                                                                                    <C>           <C>
Outstanding-beginning of year........................................................       792,450     $    2.80
Granted..............................................................................     1,178,000          7.21
Exercised............................................................................        (8,450)         1.30
Forfeited............................................................................       (56,000)         5.17
                                                                                       ------------
Outstanding-end of year..............................................................     1,906,000          5.46
                                                                                       ------------
                                                                                       ------------
</TABLE>
 
                                      F-10
<PAGE>
                                 SUPERGEN, INC.
                         (A DEVELOPMENT STAGE COMPANY)
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
4.  STOCK OPTION PLANS (CONTINUED)
 
<TABLE>
<CAPTION>
                                                                                                        WEIGHTED-
                                                                                                      AVERAGE FAIR
                                                                                         OPTIONS          VALUE
                                                                                       ------------  ---------------
<S>                                                                                    <C>           <C>
Options granted during the year:
At fair value........................................................................     1,058,000     $    4.45
At greater than fair value...........................................................       120,000          2.80
</TABLE>
 
    Information concerning the options outstanding at December 31, 1996 is as
follows:
 
<TABLE>
<CAPTION>
                              OPTIONS OUTSTANDING
                     --------------------------------------    OPTIONS EXERCISABLE
                                                WEIGHTED     ------------------------
                                  WEIGHTED       AVERAGE                   WEIGHTED
                                   AVERAGE      REMAINING                   AVERAGE
                                  EXERCISE     CONTRACTUAL     NUMBER      EXERCISE
       RANGE           NUMBER       PRICE         LIFE       EXERCISABLE     PRICE
- -------------------  ----------  -----------  -------------  -----------  -----------
<S>                  <C>         <C>          <C>            <C>          <C>
  $.0135 to $3.00       549,000   $    1.75          7.93       363,667    $    1.59
   3.01 to 6.00       1,064,000        5.47          8.22       459,063         5.51
   6.01 to 15.00        293,000       12.12          8.61        59,332        12.33
                     ----------                              -----------
 $0.0135 to $15.00    1,906,000        5.46          8.20       882,062         4.73
                     ----------                              -----------
                     ----------                              -----------
</TABLE>
 
5. ACQUISITION OF DEVELOPED TECHNOLOGY AND RELATED ASSETS
 
    On September 30, 1996, the Company purchased from Warner-Lambert Company
("Warner Lambert") the exclusive rights to the anticancer drug Pentostatin (the
"Drug"--trade name Nipent-Registered Trademark-) for the United Stated, Canada
and Mexico. The Company also acquired certain assets pertaining to the Drug,
including all of Warner-Lambert's crude concentrate form of the Drug and certain
of its finished goods inventory; the trademarks, patents and data relating to
the manufacture of the Drug; the U.S. New Drug Application relating to the Drug
(including two Orphan Drug Designations); the Canadian New Drug Submission; and
certain clinical studies. On September 30, 1996, the Company paid consideration
of $2,073,000 in cash and $1,000,000 in unregistered restricted shares of common
stock of the Company (which constituted 71,813 shares of such stock, and which
was valued at $700,000 for accounting purposes). Furthermore, the Company agreed
to pay an additional $500,000 in cash upon the earlier of the date of FDA
approval (permitting the Company to purify the Drug from the crude concentrate
at the Company's designated manufacturing facilities) or December 31, 1997. Of
the total consideration of $3,273,000, $1,561,000 has been allocated to
inventory, including $250,000 to raw materials inventory, $1,270,000 to
developed technology, which is being amortized to cost of sales of the Drug, and
$442,000 as a charge for the acquisition of in-process technology.
 
6.  COMMITMENTS AND CONTINGENCY
 
    The Company leases its facilities under noncancelable operating leases, each
of which may be renewed for one period of three to five years. In October 1996,
the Company entered into a new noncancelable five-year operating lease for its
corporate offices, which commences in February 1997. Payments subsequent to that
date, through August 1998, under the lease for the previous corporate office,
 
                                      F-11
<PAGE>
                                 SUPERGEN, INC.
                         (A DEVELOPMENT STAGE COMPANY)
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
6.  COMMITMENTS AND CONTINGENCY (CONTINUED)
totaling approximately $170,000, have been expensed as of December 31, 1996.
Future minimum rentals under all other noncancelable operating leases with terms
greater than one year are as follows:
 
<TABLE>
<CAPTION>
 YEAR ENDING DECEMBER
          31,
- -----------------------
<S>                      <C>
1997                     $    281,900
1998                          295,400
1999                          268,000
2000                          268,600
2001                          225,200
Thereafter                      7,200
                         ------------
                         $  1,346,300
                         ------------
                         ------------
</TABLE>
 
    Rent expense was $335,000, $83,000 and $71,200 for the year ended December
31, 1996, the nine months ended December 31, 1995, and the year ended March 31,
1995, respectively.
 
    The Company has entered into employment contracts with three of its key
employees requiring payments of $492,000 in 1997.
 
    The Company also has entered into technology license agreements allowing the
Company access to certain technology. These agreements generally require royalty
payments based upon the sale of approved products incorporating the technology
under license. No sales of such products have occurred as of December 31, 1996.
 
    The Company has also entered into manufacturing and service agreements for
the supply of research materials and the performance of specified research
studies. These agreements require certain payments based upon the delivery of
the research materials and the completion of the studies.
 
    The Company has agreed to invest up to $1,000,000 of the proceeds from the
sale of stock to Israel Chemicals, Ltd. in projects in Israel on or prior to
December 31, 1997, subject to certain conditions. Approximately $250,000 had
been expensed related to such projects as of December 31, 1996.
 
                                      F-12
<PAGE>
                                 SUPERGEN, INC.
                         (A DEVELOPMENT STAGE COMPANY)
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
7.  INCOME TAXES
 
    The significant components of the Company's deferred tax assets are as
follows:
 
<TABLE>
<CAPTION>
                                                                                              DECEMBER 31,
                                                                                      ----------------------------
                                                                                          1996           1995
                                                                                      -------------  -------------
<S>                                                                                   <C>            <C>
Deferred tax assets:
  Net operating loss carryforwards..................................................  $   5,875,000  $   3,280,000
  Credit carryforwards..............................................................        425,000        265,000
  Accruals not currently recognized for tax purposes................................        125,000        152,000
  Capitalized research and development..............................................        450,000         55,000
  Other.............................................................................        475,000         78,000
                                                                                      -------------  -------------
  Total deferred tax assets.........................................................      7,350,000      3,830,000
  Valuation allowance...............................................................     (7,350,000)    (3,830,000)
                                                                                      -------------  -------------
  Net deferred tax assets...........................................................  $          --  $    --
                                                                                      -------------  -------------
                                                                                      -------------  -------------
</TABLE>
 
    The valuation allowance increased by $1,072,000 during the nine months ended
December 31, 1995 and by $1,613,000 during the year ended March 31, 1995.
 
    As of December 31, 1996 the Company has net operating loss carryforwards for
federal income tax purposes of approximately $16,400,000 expiring in the years
2009 through 2011, and net operating losses for state income tax purposes of
$5,200,000 expiring in the years 1997 through 2001. Because of the "change in
ownership" provisions of the Tax Reform Act of 1986, utilization of the
Company's tax net operating loss carryforwards and tax credit carryforwards may
be subject to an annual limitation in future periods. As a result of the annual
limitation, a portion of these carryforwards may expire before ultimately
becoming available to reduce future income tax liabilities.
 
8.  EMPLOYEE BENEFIT PLAN
 
    On December 1996, the Company adopted a 401(k) Profit Sharing Plan (the
"401(k) Plan") for all eligible employees with over six months of service.
Voluntary employee contributions to the 401(k) Plan may be matched 50% by the
Company, up to 3% of each participant's annual compensation. The Company's
expense under the 401(k) Plan was approximately $24,000 for 1996.
 
9.  SUBSEQUENT EVENT
 
    On January 15, 1997, the Company purchased all the finished goods, the
abbreviated New Drug Application, and related records and know-how pertaining to
the generic drug Etoposide from Immunex Corporation for cash consideration of
$1,260,000.
 
                                      F-13
<PAGE>
                                 SUPERGEN, INC.
                         (A DEVELOPMENT STAGE COMPANY)
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
10. UNAUDITED STATEMENT OF OPERATIONS AND STATEMENT OF CASH FLOWS FOR THE NINE
    MONTHS ENDED DECEMBER 31, 1994
 
                            STATEMENT OF OPERATIONS
 
<TABLE>
<CAPTION>
                                                                                                NINE MONTHS ENDED
                                                                                                DECEMBER 31, 1994
                                                                                                ------------------
                                                                                                   (UNAUDITED)
<S>                                                                                             <C>
Contract revenues from related parties........................................................    $       95,129
Operating expenses:
  Research and development....................................................................         2,016,596
  Sales and marketing.........................................................................           144,016
  General and administrative..................................................................           511,321
                                                                                                ------------------
    Total operating expenses..................................................................         2,671,933
                                                                                                ------------------
Loss from operations..........................................................................        (2,576,804)
Interest income...............................................................................            75,892
                                                                                                ------------------
Net loss......................................................................................    $   (2,500,912)
                                                                                                ------------------
                                                                                                ------------------
Net loss per share............................................................................              $(.21)
                                                                                                ------------------
                                                                                                ------------------
Shares used in net loss per share calculation.................................................         11,796,760
                                                                                                ------------------
                                                                                                ------------------
</TABLE>
 
                            STATEMENT OF CASH FLOWS
 
<TABLE>
<CAPTION>
                                                                                                NINE MONTHS ENDED
                                                                                                DECEMBER 31, 1994
                                                                                                ------------------
                                                                                                   (UNAUDITED)
<S>                                                                                             <C>
Operating activities
  Net loss....................................................................................    $   (2,500,912)
  Adjustments to reconcile net loss to net cash used in operating activities:
    Depreciation and amortization.............................................................            32,564
    Changes in operating assets and liabilities:
      Prepaid expenses and other current assets...............................................          (247,728)
      Other assets............................................................................           (30,644)
      Accounts payable and accrued liabilities................................................            (6,916)
                                                                                                ------------------
Net cash used in operating activities.........................................................        (2,753,636)
Investing activities
  Purchase of property and equipment, net.....................................................           (76,747)
Financing activities
  Issuance of common stock....................................................................         3,990,000
                                                                                                ------------------
Net increase in cash..........................................................................         1,159,617
Cash at beginning of period...................................................................         1,893,414
                                                                                                ------------------
Cash at end of period.........................................................................    $    3,053,031
                                                                                                ------------------
                                                                                                ------------------
</TABLE>
 
                                      F-14
<PAGE>
                                   SIGNATURES
 
    Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the Registrant has duly caused this Report to be signed on
its behalf by the undersigned, thereunto duly authorized, on this 26th day of
March, 1997.
 
                                SUPERGEN, INC.
 
                                By:             /s/ JOSEPH RUBINFELD
                                     -----------------------------------------
                                                  Joseph Rubinfeld
                                     PRESIDENT, CHIEF EXECUTIVE OFFICER, CHIEF
                                          SCIENTIFIC OFFICER AND DIRECTOR
 
                               POWER OF ATTORNEY
 
    KNOW ALL PERSONS BY THESE PRESENTS, that each such person whose signature
appears below constitutes and appoints, jointly and severally, Joseph Rubinfeld
and Henry C. Settle, Jr., his attorneys-in-fact, each with the power of
substitution, for him in any and all capacities, to sign any amendments to this
Report on Form 10-K, and to file the same, with exhibits thereto and other
documents in connection therewith, with the Securities and Exchange Commission,
hereby ratifying and confirming all that each of said attorneys-in-fact, or his
substitute or substitutes, may do or cause to be done by virtue hereof.
 
    Pursuant to the requirements of the Securities Exchange Act of 1934, this
Report on Form 10-K has been signed below by the following persons on behalf of
the Registrant and in the capacities and on the dates indicated:
 
          SIGNATURE                       TITLE                    DATE
- ------------------------------  --------------------------  -------------------
 
                                President, Chief Executive
     /s/ JOSEPH RUBINFELD         Officer, Chief
- ------------------------------    Scientific Officer and      March 26, 1997
      (Joseph Rubinfeld)          Director (Principal
                                  Executive Officer)
 
   /s/ HENRY C. SETTLE, JR.     Chief Financial Officer
- ------------------------------    (Principal Financial and    March 26, 1997
    (Henry C. Settle, Jr.)        Accounting Officer)
 
     /s/ DAVID M. FINEMAN
- ------------------------------  Director                      March 26, 1997
      (David M. Fineman)
 
   /s/ J. GREGORY SWENDSEN
- ------------------------------  Director                      March 26, 1997
    (J. Gregory Swendsen)
 
       /s/ DENIS BURGER
- ------------------------------  Director                      March 26, 1997
        (Denis Burger)
 
      /s/ JULIUS A. VIDA
- ------------------------------  Director                      March 26, 1997
       (Julius A. Vida)
 
       /s/ DANIEL ZURR
- ------------------------------  Director                      March 26, 1997
        (Daniel Zurr)
 
                                      S-1
<PAGE>
                 SCHEDULE II--VALUATION AND QUALIFYING ACCOUNTS
                                 SUPERGEN, INC.
                               DECEMBER 31, 1996
 
<TABLE>
<CAPTION>
                                                                    COL. C
                                                        ------------------------------
                                            COL. B                ADDITIONS
                                         -------------  ------------------------------    COL. D         COL. E
                COL. A                    BALANCE AT    CHARGED TO                      -----------  ---------------
- ---------------------------------------  BEGINNING OF    COSTS AND   CHARGED TO OTHER   DEDUCTIONS-  BALANCE AT END
DESCRIPTION                                 PERIOD       EXPENSES    ACCOUNTS-DESCRIBE   DESCRIBE       OF PERIOD
- ---------------------------------------  -------------  -----------  -----------------  -----------  ---------------
<S>                                      <C>            <C>          <C>                <C>          <C>
Year ended December 31, 1996:
  Deducted from asset accounts--
    Allowance for doubtful accounts....    $  --         $  10,000       $  --           $  --          $  10,000
    Reserve for product returns........       --            --              62,400(1)       --             62,400
                                         -------------  -----------        -------      -----------       -------
                                           $  --         $  10,000       $  62,400       $  --          $  72,400
                                         -------------  -----------        -------      -----------       -------
                                         -------------  -----------        -------      -----------       -------
</TABLE>
 
- ------------------------------
 
(1) Charged to sales
 
                                      S-2
<PAGE>
                                 SUPERGEN, INC.
                               INDEX TO EXHIBITS
 
<TABLE>
<CAPTION>
    EXHIBIT                                                                                           SEQUENTIALLY
    NUMBER       DESCRIPTION OF DOCUMENT                                                              NUMBERED PAGE
- ---------------  --------------------------------------------------------------------------------  -------------------
<C>              <S>                                                                               <C>
        (a) 3.2  Restated Articles of Incorporation of the Registrant, as currently in effect.
        (b) 3.3  Bylaws, as amended, of the Registrant.
        (a)10.1  Form of Indemnification Agreement between the Registrant and each of its
                   directors and officers.
        (a)10.2  1993 Stock Plan, as amended and restated, and forms of stock option agreements
                   thereunder.
        (a)10.3  1996 Directors Stock Option Plan and form of stock option agreements thereunder.
        (a)10.4  Sublease Agreement dated March 25, 1991 between the Registrant and Jelly Bean
                   Square, a California general partnership, as amended.
        (a)10.5  Sublease Agreement dated June 29, 1993 between the Registrant and Jelly Bean
                   Square, a California general partnership, as amended.
        (a)10.6  Lease Agreement dated September 26, 1994 between the Registrant and Arthur J.
                   Rogers & Co., as amended.
     (b)(d)10.7  Patent Royalty Agreement dated June 30, 1992 between the Registrant and
                   Progenics, Inc.
     (b)(d)10.8  Patent License and Royalty Agreement dated August 30, 1993 between the
                   Registrant and The Jackson Laboratory.
     (b)(d)10.9  Worldwide License Agreement dated March 1, 1994 between the Registrant and
                   Janssen Biotech, N.V.
    (b)(d)10.10  Patent License Agreement dated March 1, 1994 between the Registrant and Cyclex
                   Inc.
    (b)(d)10.11  Patent License and Royalty Agreement dated November 15, 1993 between the
                   Registrant and The Long Island Jewish Medical Center.
    (b)(d)10.12  License Agreement dated February 1, 1995 between the Registrant and Pharmos
                   Corporation.
       (b)10.13  Research and License Agreement dated August 1, 1993 between the Registrant and
                   Amur Research Corp.
       (b)10.14  Amended and Restated Stock Purchase Agreement dated May 30, 1995 between Israel
                   Chemicals, Ltd. and the Registrant and the related Amended and Restated
                   Shareholders Agreement dated June 2, 1995.
       (b)10.15  Employment, Confidential Information and Invention Assignment Agreement dated
                   January 1, 1994 between the Registrant and Joseph Rubinfeld and form of
                   amendment.
       (b)10.16  Employment, Confidential Information and Invention Assignment Agreement dated
                   February 1, 1994 between the Registrant and Francis H. Lee.
       (b)10.17  Employment, Confidential Information and Invention Assignment Agreement dated
                   February 1, 1994 between the Registrant and Frank Brenner.
       (b)10.19  Form of Consulting Agreement between the Registrant and J. Gregory Swendsen and
                   David M. Fineman.
       (b)10.20  Consulting Agreement between the Registrant and Vida International
                   Pharmaceutical Consultants.
</TABLE>
<PAGE>
<TABLE>
<CAPTION>
    EXHIBIT                                                                                           SEQUENTIALLY
    NUMBER       DESCRIPTION OF DOCUMENT                                                              NUMBERED PAGE
- ---------------  --------------------------------------------------------------------------------  -------------------
<C>              <S>                                                                               <C>
       (c)10.21  Purchase and Sale Agreement dated as of September 30, 1996 between the
                   Registrant and Warner-Lambert Company, a Delaware corporation.
       (e)10.22  Asset Purchase Agreement dated January 15, 1997 between the Registrant and
                   Immunex Corporation, a Washington corporation.
          10.23  Standard Offer, Agreement and Escrow Instructions for Purchase of Real Estate
                   (Non-Residential) dated December 11, 1996 between the Registrant and The
                   Ashwill Trust, established November 8, 1989.
       (e)10.24  Bishop Ranch Business Park Building Lease dated October 14, 1996 between the
                   Registrant and Annabel Investment Company, a California partnership.
           23.1  Consent of Ernst & Young LLP, Independent Auditors.
           24.1  Power of Attorney.
</TABLE>
 
- ------------------------
 
(a) Incorporated by reference from the Registrant's Registration Statement on
    Form SB-2 (Reg. No. 33-476-LA). Except as noted, each exhibit listed is
    incorporated by reference to the exhibit of the same number.
 
(b) Incorporated by reference from Amendment No. 1 to the Registrant's
    Registration Statement on Form SB-2 (Reg. No. 33-476-LA). Except as noted,
    each exhibit listed is incorporated by reference to the exhibit of the same
    number.
 
(c) Incorporated by reference from the Registrant's Report on Form 8-K filed
    with the Securities and Exchange Commission on October 15, 1996. The exhibit
    listed is incorporated by reference to Exhibit 2.1 of Registrant's Report on
    Form 8-K.
 
(d) Confidential treatment has been previously granted for certain portions of
    these exhibits.
 
(e) Confidential treatment requested for certain portion of this exhibit.

<PAGE>
                                                           Exhibit 10.22
                                              REDACTED
                                              CONFIDENTIAL TREATMENT REQUESTED


                            ASSET PURCHASE AGREEMENT


     This ASSET PURCHASE AGREEMENT is made and entered into as of January 15,
1997 (the "Agreement") by and between Immunex Corporation, a Washington
corporation ("Immunex"), and SuperGen, Inc., a California corporation
("SuperGen").


                              W I T N E S S E T H:

     WHEREAS, Immunex desires to sell to SuperGen and SuperGen desires to
purchase from Immunex the Purchased Assets (hereinafter defined) upon the terms
and conditions and for the Purchase Price (hereinafter defined) as set forth in
this Agreement;

     NOW, THEREFORE, in consideration of the foregoing premises and the mutual
covenants herein contained, SuperGen and Immunex hereby agree as follows:


ARTICLE 1:  DEFINITIONS

     As used in this Agreement the following defined terms shall have the
meanings set forth below:

     1.1  "Affiliate" means any corporation or business entity of which a party
owns directly or indirectly, fifty percent (50%) or more of the assets or
outstanding stock, or any corporation which a party directly or indirectly
controls, or any parent corporation that owns, directly or indirectly, fifty
percent (50%) or more of the assets or outstanding stock of a party or directly
or indirectly controls a party.

     1.2  "ANDA" means the Abbreviated New Drug Application No. 74-513, filed
with the United States Food and Drug Administration for Etoposide injection,
which is owned/sponsored by Immunex, including all information therein.

     1.3  "Applicable Laws" means all laws, treaties, statutes, ordinances,
judgments, decrees, directives, rules, injunctions, writs, regulations, binding
arbitration rulings, orders, judicial or administrative interpretations or
authorization of, any Governmental Authority having jurisdiction over the
Purchased Assets in the Territory, as may be in effect on the Closing Date.

     1.4  "Closing" shall have the meaning set forth in Section 2.4.

     1.5  "Closing Date" means January 15, 1997 or such other date as is
determined in accordance with Section 2.4.


<PAGE>

     1.6  "Encumbrances" mean all claims, security interests, liens, pledges,
charges, escrows, options, proxies, rights of first refusal, preemptive rights,
mortgages, hypothecations, prior assignments, title retention agreements,
indentures, security agreements or any other encumbrances of any kind.

     1.7  "Etoposide" means the pharmaceutical compound 4'-
demethylepipodophyllotoxin 9-[4,6-0-(R)-ethylidene-B-D-glucopyranoside].

     1.8  "FDA" means the United States Food and Drug Administration.

     1.9  "Governmental Authority" means any governmental department, 
commission, board, bureau, agency, court or other instrumentality of the 
United States including but not limited to federal, state, district or 
commonwealth thereof, any foreign government or any jurisdiction, 
municipality or other political subdivision thereof.

     1.10 "Inventory" means Immunex's Etoposide inventory of Product set 
forth on Exhibit A.

     1.11 "Know-How" means all data, information, know-how (including without 
limitation, processes and methods) relating to the manufacture, testing, 
storage, or regulatory status of the Product.

     1.12 "Losses" means any and all damages, fines, liabilities, fees, 
penalties, deficiencies, losses and expenses (including, without limitation 
interest, court costs, fees of attorneys, accountants and other experts and 
other expenses of litigation or other proceedings or of any claim, default or 
assessment).

     1.13 "Master Production Records" means those records relating to the 
production of Etoposide as identified in the ANDA.

     1.14 "Person" means an individual, a corporation, a partnership, an 
association, a trust or other entity or organization, including a government 
or political subdivision or an agency or instrumentality thereof.

     1.15 "Product" means the Etoposide injection product in vialed dosage 
form currently manufactured for and sold by Immunex.  As used herein, Product 
shall refer interchangeably to Etoposide injection in the 5 ml. multiple dose 
vial containing 100 mg. Etoposide (NDC #58406-711-12) and the 12.5 ml. 
multiple dose vial containing 250 mg. Etoposide (NDC #58406-714-18).

     1.16 "Purchase Price" shall have the meaning set forth in Section 2.2.

     1.17 "Purchased Assets" shall mean all of the (i) ANDA, (ii) Inventory, 
(iii) Records and (iv) Know-How.

                                    -2-
<PAGE>

                                              CONFIDENTIAL TREATMENT REQUESTED

     1.18 "Records" means the stability reports, Master Production Records, 
adverse reaction reports, material documents and correspondence with any 
Governmental Authority relating to the Purchased Assets, and other records 
identified on Exhibit A.

     1.19 "Termination Date" shall have the meaning set forth in Section 7.1.

     1.20 "Territory" means the United States of America including its 
territories and possessions.

     1.21 "United States" means the United States of America, its territories 
and possessions, the Commonwealth of Puerto Rico and the District of Columbia.

ARTICLE 2:  PURCHASE AND SALE; CLOSING

     2.1  CONVEYANCE.  On the Closing Date, subject to the terms and 
conditions set forth in this Agreement, Immunex shall sell, transfer, assign, 
convey and deliver to SuperGen good and marketable title to the Purchased 
Assets free and clear of any Encumbrances of any kind and SuperGen shall 
purchase good and marketable title to the Purchased Assets from Immunex free 
and clear of any Encumbrances of any kind ("Closing Date").  Immunex shall 
execute and deliver such documents of conveyance and take any other action as 
may be necessary to transfer the Purchased Assets to SuperGen as set forth in 
the preceding sentence. 

     2.2  PURCHASE PRICE.

          (a)  In full consideration for transfer of the Purchased Assets, 
SuperGen shall pay in cash $1,260,000 (the "Purchase Price") as follows: 
[*] for the ANDA and [*] for the Inventory.

          (b)  The cash payments of the Purchase Price shall be made in 
United States dollars by bank wire transfer in immediately available funds to 
an account designated in writing by Immunex.

          (c)  The amount of the cash payment to be made on the Closing Date 
is based in part upon the Inventory including no less than [*] vials of 
Product as shown on Exhibit A.  Should the Inventory as actually delivered 
include less than [*] vials of Product, then Immunex shall promptly upon 
written notice from SuperGen, refund to SuperGen in cash the amount of (i) 
[*] multiplied by the difference between [*] vials of 5 ml. Product and 
the actual number of vials delivered, and (ii) [*] multiplied by the 
difference between [*] vials of 12.5 ml. Product and the actual number of 
vials delivered.

     In the event Immunex possess any additional Product on the Closing Date 
over and above the quantities identified in Exhibit A, SuperGen shall have 
the right to purchase such additional inventory at the cost of [*] per 
vial for the 5 ml Product and [*] per vial for the 12.5 ml Product.  

                                    -3-

<PAGE>

                                             CONFIDENTIAL TREATMENT REQUESTED


     SuperGen shall pay for all shipping costs in connection with the 
delivery of the Inventory to SuperGen.

     2.3   ASSUMPTION OF LIABILITIES. SuperGen will assume at the Closing and 
subsequently, in due course, pay, honor and discharge (except where it is 
contesting in good faith) all liabilities and responsibilities relating to 
the Purchased Assets arising after the Closing (except as set forth in 
Section 6.1(a)(i)(d)), including, but not limited to all regulatory 
responsibilities and obligations related to the ANDA arising after the 
Closing and, with respect to the Product, all responsibilities under the 
Applicable Laws relating to the use, manufacture, promotion, sale, and 
distribution thereof arising after the Closing ("Assumed Liabilities").  
Except as set forth in the preceding sentence, SuperGen shall not assume, and 
Immunex shall retain and be responsible for, any and all liabilities and 
obligations of Immunex of any kind whatsoever, including, but not limited to, 
any liability relating to the Purchased Assets arising on or before the 
Closing or in connection therewith, (the "Non-Assumed Liabilities").  Without 
limiting the generality of the foregoing, SuperGen shall not assume (a) 
liabilities of Immunex for occupation or similar taxes and related filing 
fees or charges, if any, arising out of or in connection with the sale, 
assignment, transfer or conveyance of the Purchased Assets hereunder to 
SuperGen or (b) liabilities for federal, state, local or foreign income or 
other taxes of, or due or to become due from, Immunex with respect to any 
period ending on or before the Closing Date or events that occurred on or 
before the Closing Date or arising out of, or resulting from the sale of the 
Purchased Assets hereunder to SuperGen on or before the Closing Date.  
Notwithstanding the foregoing, SuperGen will assume all liability for sales 
tax on the ANDA as a result of the purchase. 

     2.4   THE CLOSING.   The closing of the sale and purchase of the 
Purchased Assets and the consummation of the transactions contemplated hereby 
(the "Closing") shall take place at the offices of Wilson Sonsini Goodrich & 
Rosati on January 15, 1997 or at such other time, date or place as the 
parties may mutually agree upon in writing (the "Closing Date").  At the 
Closing, the parties to this Agreement will exchange funds, certificates and 
other documents specified in this Agreement.  For purposes of this Agreement 
the Closing will be treated as if it occurred at 9:00 a.m. PST on the Closing 
Date.

     2.5   CLOSING TRANSACTIONS.  At the Closing, and as a condition thereof 
(provided any condition for the benefit of either party hereto may be waived 
by such party):

           (a)  Immunex shall cause to be delivered to SuperGen the Purchased 
Assets and all documents necessary to transfer, assign, convey and deliver 
good and marketable title to the Purchased Assets;

           (b)  Immunex shall provide to SuperGen all necessary and 
applicable notifications of change to the relevant Governmental Authorities 
respecting the change in the ownership of the Purchased Assets, which 
notifications shall be promptly delivered subsequent to the Closing;

           (c)  Immunex shall cause to be delivered [*] vials of Product;

           (d)  SuperGen shall deliver $1,260,000 in cash to Immunex;

                                    -4-
<PAGE>

           (e)  SuperGen will deliver such instruments of assumption and 
other certificates, instruments or documents, in form and substance 
reasonably acceptable to Immunex, as may be necessary to effect SuperGen's 
assumption under Applicable Laws of the Assumed Liabilities; 

           (f)  Each of Immunex and SuperGen shall deliver to the other party 
a certificate in which an officer of each respective company certifies the 
truth and accuracy of its representations and warranties set forth in Section 
3 (with respect to Immunex) and Section 4 (with respect to SuperGen) as of 
the Closing Date.

     2.6   Immunex reserves the right, for itself and on behalf of its 
Affiliates, at any time after the Closing Date to reference the ANDA for 
purposes of obtaining any registration or governmental approvals needed to 
manufacture, test, sell or distribute Etoposide in any country outside of the 
Territory or, subject to Section 5.5 to make Etoposide, or to have Etoposide 
made in the United States solely for export and final sale outside the United 
States.

ARTICLE 3:  REPRESENTATIONS AND WARRANTIES OF IMMUNEX

     Immunex hereby represents and warrants to SuperGen as follows:

     3.1   ORGANIZATION, GOOD STANDING, POWER, ETC.  Immunex is a corporation 
duly organized, validly existing and in good standing under the laws of the 
state of Washington and has all requisite power and authority to own, operate 
and lease its properties and to carry on its business as now being conducted. 
Immunex has full corporate power and authority to enter into this Agreement 
and to consummate the transactions contemplated hereunder, and the execution, 
delivery and performance of this Agreement and the transactions contemplated 
hereby by Immunex have been duly and validly authorized by proper corporate 
action, and no other proceedings on the part of Immunex are necessary to 
authorize this Agreement and the transactions contemplated hereby.  This 
Agreement has been duly executed and delivered by Immunex and constitutes a 
legal, valid and binding obligation of Immunex enforceable against Immunex in 
accordance with its terms, subject to general principles of equity and except 
as enforceability hereof may be limited by applicable bankruptcy, insolvency, 
reorganization or other laws of general application relating to creditors' 
rights.  There are no outstanding agreements, assignments, licenses or 
Encumbrances inconsistent with the provisions of this Agreement or which may 
prevent or hinder Immunex from consummating the transactions contemplated by 
this Agreement or may prevent or hinder SuperGen from sponsoring the ANDA.

     3.2   NO CONFLICT.  Neither the execution and delivery of this Agreement 
nor the consummation of the transactions contemplated hereby will: (i) 
conflict with the articles of incorporation or by-laws of Immunex; (ii) 
violate any order, writ, injunction or decree applicable to Immunex; (iii) 
violate any provisions of laws, rules or regulations to which Immunex is 
subject; (iv) violate, conflict with or result in any breach of or default 
under any mortgage, indenture, contract, agreement, license, permit, 
instrument or trust to which Immunex is a party or by which its properties 
are bound; or (v) result in the creation or imposition of any Encumbrance of 
any kind whatsoever upon, or give to any person other than SuperGen any 
interest or right in the Purchased 

                                    -5-
<PAGE>

Assets or give any right of acceleration, termination or cancellation in or 
with respect to, any of the ANDA or the rights of SuperGen to be the sponsor 
thereof.

      3.3   CONSENTS AND APPROVALS.  Immunex has obtained all necessary 
consents, approvals, orders or authorizations of, and has performed all 
necessary registrations, declarations or filings with any Governmental 
Authority required by or with respect to Immunex in connection with the 
execution and delivery of this Agreement by Immunex or the consummation by 
Immunex of the transactions contemplated hereby.  Immunex is conducting, and 
has conducted, its business and operations as it relates directly or 
indirectly to the Purchased Assets in compliance in all material respects 
with all governmental laws, rules and regulations applicable thereto and is 
not in violation or default in any material respect under any statute, 
regulation, order, decree or governmental authorization applicable to it or 
any of its properties or business as presently conducted or proposed to be 
conducted as it relates directly or indirectly to the Purchased Assets, 
including without limitation laws, rules and regulations administered or 
issued by the FDA and any environmental laws, rules and regulations.  Immunex 
is not subject to any order or consent decree of any court or administrative 
body that relates in any way, directly or indirectly, to the Purchased 
Assets. 

     3.4   PURCHASED ASSETS.  Immunex has full right, title and interest to, 
and at the Closing will sell, convey, assign, transfer and deliver to 
SuperGen good title to all Purchased Assets.  The Purchased Assets are free 
and clear of any Encumbrance of any party.  There are no material problems or 
defects in any of the Purchased Assets which would directly or indirectly 
adversely affect such Purchased Assets or SuperGen's ability to sell Product 
after the Closing or, as a direct or indirect result of such defects, would 
render the Product unmarketable for the purposes for which they were 
intended.  All material adverse experiences associated with the Immunex 
labeled product and known to Immunex are included in the ANDA.  To the best 
of Immunex's knowledge, there is no infringement by any third party of its 
title to the Purchased Assets. 

     3.5   LEGAL PROCEEDINGS.  There are no adverse third party actions or 
claims pending against Immunex  in any court or by or before any Governmental 
Authority with respect to the Purchased Assets.  There are no other actions, 
suits, proceedings, claims or, to the best knowledge of Immunex, 
investigations pending against Immunex, nor has Immunex received notice of 
any of the foregoing, with respect to the transactions contemplated hereby or 
materially affecting the value of the Purchased Assets or which, if adversely 
determined, would prevent Immunex from consummating the transactions 
contemplated hereby.  There is no reason that could preclude SuperGen from 
marketing and selling the Purchased Assets in the Territory after the Closing.

     3.6   INVENTORY.  As of the Closing Date (i) all the Inventory is in 
good and merchantable condition; (ii) all of the Inventory was prepared in 
compliance with current good manufacturing practice regulations for 
pharmaceuticals, and (iii) all finished Inventory which has been released 
meets all applicable specifications and legal requirements and may be 
lawfully sold in the Territory. The expiration date on all such Inventory is 
as set forth on Exhibit A.

                                    -6-
<PAGE>

     3.7   TAXES.  Immunex has duly paid all taxes and other governmental 
charges, if any, due and payable upon the Purchased Assets and any income or 
sales tax, if any, relating to the Purchased Assets prior to the Closing 
Date. Neither the Internal Revenue Service nor any other taxing authority has 
in the past asserted or is now asserting or, to the best knowledge of 
Immunex, is threatening to assert against Immunex, any deficiency or claim 
for additional taxes or interest thereon or penalties in connection therewith 
with respect to the Purchased Assets.

     3.8   RECORDS.  Immunex has delivered to SuperGen true and complete 
copies of all Records. The Records include all documents (other than 
marketing projections and routine correspondence between Immunex and its 
Affiliates regarding the Product) of any kind whatsoever which are directly 
or indirectly material to the Purchased Assets.

     3.9   AGREEMENTS.  There are no outstanding contracts, leases, 
instruments, obligations, commitments, understandings and agreements, whether 
written or oral, to which Immunex is a party and to which the Purchased 
Assets will be subject subsequent to the Closing. Immunex has no material 
agreement with any third party which will obligate SuperGen to make any 
payments to such third parties with respect to any of the Purchased Assets.

     3.10  FDA MATTERS.  The Product now being commercially distributed by 
Immunex in the Territory meets the applicable legal requirements of the 
applicable jurisdiction in all material respects and all requisite 
governmental approvals have been duly obtained and are in full force and 
effect.  There is no action or proceeding by the FDA or any other 
Governmental Authority, including, but not limited to, recall procedures, 
pending or, to the knowledge of Immunex, threatened against Immunex relating 
to safety or efficacy of any of the Purchased Assets.

     3.11  FULL DISCLOSURE.  No representation, warranty or statement of 
Immunex in this Agreement contains or will contain at the Closing Date any 
untrue statement of a material fact or omits or will omit to state a material 
fact necessary in order to make the statements contained herein, in light of 
the circumstances under which made, not misleading.

ARTICLE 4:  REPRESENTATIONS AND WARRANTIES OF SUPERGEN

     SuperGen hereby represents and warrants to Immunex as follows:

     4.1   CORPORATE ORGANIZATION.  SuperGen is a corporation duly organized, 
validly existing and in good standing under the laws of California.  SuperGen 
has the requisite power and authority to own, operate and lease its 
properties and carry on its business as now being conducted.

     4.2   AUTHORITY RELATIVE TO THIS AGREEMENT.  SuperGen has the requisite 
corporate power and authority to execute and deliver this Agreement and to 
consummate the transactions contemplated hereby.  The execution and delivery 
by SuperGen of this Agreement and the consummation by SuperGen of the 
transactions contemplated hereby have been duly authorized by all necessary 
corporate action on the part of SuperGen and no other corporate proceeding is 
necessary 

                                    -7-
<PAGE>

for the execution and delivery of this Agreement, the performance by SuperGen 
of its obligations hereunder and the consummation by SuperGen of the 
transactions contemplated hereby.  This Agreement has been duly executed and 
delivered by SuperGen and constitutes a legal, valid and binding obligation 
of SuperGen, enforceable against SuperGen in accordance with its terms, 
except as the same may be limited by bankruptcy, insolvency, moratorium, 
reorganization or other laws of general applicability relating to or 
affecting the enforcement of creditor's rights and general principles of 
equity.

     4.3   NO CONFLICT.  The execution, delivery and performance of this 
Agreement by SuperGen shall not (i) conflict with or result in any breach of 
any provision of the certificate of incorporation or bylaws of SuperGen; or 
(ii) violate any order, writ, injunction, decree, or any statute, rule or 
regulation applicable to SuperGen or its Affiliates or any of its properties 
or assets.

     4.4   FINANCING.  SuperGen has sufficient funds available to purchase 
the Purchased Assets and to pay all related fees and expenses for which 
SuperGen is responsible pursuant to the terms hereof.

     4.5   NO OTHER REPRESENTATIONS OR WARRANTIES.  Except for the 
representations and warranties of SuperGen expressly set forth in this 
Agreement, neither SuperGen nor any other Person makes any other express or 
implied representation or warranty on behalf of SuperGen.

ARTICLE 5:  COVENANTS

     Immunex covenants and agrees with SuperGen and SuperGen covenants and 
agrees with Immunex as follows:

     5.1   POST-CLOSING ORDERS.  After the Closing Date, Immunex agrees to 
forward to SuperGen all unfilled orders for Product received after the 
Closing Date.

     5.2   SALE OF THE PRODUCT.  Immunex hereby agrees that SuperGen shall 
have the right to sell in the Territory any Inventory bearing the "Immunex" 
trademark which may be included in the Purchased Assets.  SuperGen agrees to 
maintain any such Inventory under conditions required by the ANDA and any 
other applicable laws and regulations in order to assure that the Product 
meets all approved specifications at the time of distribution.

     5.3   FURTHER ASSURANCES.  From time to time, without further 
consideration, each party, at its own expense, shall execute and deliver such 
documents to the other party and shall take such further actions as such 
other party may reasonably request in order more effectively to consummate 
the transactions contemplated hereby.  In addition, without limiting and 
subject to the indemnification set forth in Section 6.1(b), Immunex agrees 
that it will reasonably cooperate, at SuperGen's request, in the event of any 
litigation regarding the Purchased Assets, provided that SuperGen agrees to 
pay Immunex's out-of-pocket expenses relating thereto.

                                    -8-
<PAGE>

     5.4   NOTICES OF CERTAIN EVENTS.  Immunex and SuperGen covenant and 
agree that, pending the Closing, each shall notify the other of any fact or 
condition, including but not limited to any notice or other communication 
from any Person alleging that the consent of such Person is or may be 
required in connection with the transactions contemplated by this Agreement, 
any notice or communication from any Governmental Authority in connection 
with the Purchased Assets or the transactions contemplated by this Agreement, 
or, with respect to SuperGen, any condition which may effect its ability to 
pay the Purchase Price, which could delay or otherwise prevent the Closing.

     5.5   IMMUNEX'S COVENANT NOT TO COMPETE. 

           (a)  In furtherance of the transactions contemplated by this 
Agreement and in order to secure the interests of the parties hereto, Immunex 
agrees that it will not, for a period of six years from the Closing Date, for 
any reason whatsoever, directly or indirectly, for itself or on behalf of or 
in conjunction with any other Person sell Product anywhere in the Territory 
or have any ownership interest in, or participate in the financing, 
operation, management or control of any Person selling Product in the 
Territory or enter into any partnership, joint venture or similar 
collaborative arrangement with any Person to sell Product in the Territory, 
or transfer Product to a third person with the intent to sell Product in the 
Territory.  Notwithstanding the foregoing, in the event that Immunex is 
acquired by a company that prior to the time of the acquisition is in the 
business of selling the Etoposide, the acquisition of Immunex by such company 
(and such parent company's subsequent continued sale of the Etoposide) shall 
not constitute a breach of this covenant not to compete.

           (b)  It is expressly understood and agreed that, if any of the 
agreements contained in this Section 5.5 are for any reason found to be 
unreasonably broad, oppressive or unenforceable in an action, suit or 
proceeding before any federal or state court, such court (i) shall narrow the 
covenant not to compete or shall otherwise endeavor to reform the scope of 
such agreements in order to ensure that the application thereof is not 
unreasonably broad, oppressive or unenforceable and (ii) to the fullest 
extent permitted by law, shall enforce such agreements as so reformed. 

           (c)  All of the covenants in this Section 5.5 shall be construed 
as an agreement independent of any other provision in this Agreement, and the 
existence of any claim or cause of action of Immunex against SuperGen, 
whether predicated on this Agreement or otherwise, shall not constitute a 
defense to the enforcement by SuperGen of such covenants.  It is specifically 
agreed that the period of six years stated at the beginning of this Section 
5.5, during which the agreements and covenants of Immunex made in this 
Section 5.5 shall be effective, shall be computed by excluding from such 
computation any time during which Immunex is found by a court of competent 
jurisdiction to have been in violation of any provision of this Section 5.5.  
The covenants contained in Section 5.5 shall not be affected by any breach of 
any other provision hereof by an party hereto and shall have no effect if the 
transactions contemplated by this Agreement are not consummated.

           (d)  Immunex and SuperGen hereby agree that the covenants set 
forth in this Section 5.5 are a material and substantial part of the 
transactions contemplated by this Agreement.

                                    -9-
<PAGE>

           (e)  Because of the difficulty of measuring economic losses to 
SuperGen as a result of a breach of the restrictive covenants set forth in 
this Section 5.5, and because of the immediate and irreparable damage that 
would be caused to SuperGen for which monetary damages would not be a 
sufficient remedy, it is hereby agreed that in addition to all other remedies 
that may be available to SuperGen at law or in equity, SuperGen shall be 
entitled to specific performance and any injunctive or other equitable relief 
as a remedy for any breach or threatened breach of the aforementioned 
restrictive covenants.

ARTICLE 6:  INDEMNIFICATION

     6.1   INDEMNIFICATION

           (a)  INDEMNIFICATION BY IMMUNEX.  Immunex covenants and agrees to 
indemnify, defend, protect and hold harmless SuperGen and its officers, 
directors, employees, stockholders, assigns, successors and Affiliates 
(individually, a "SuperGen Indemnified Party" and collectively, "SuperGen 
Indemnified Parties") from, against and in respect of:

                (i)  all Losses suffered, sustained, incurred or paid by any 
SuperGen Indemnified Party in connection with, resulting from or arising out 
of or relating to, directly or indirectly:

                     (a)  any breach of any representation or warranty of 
Immunex set forth in this Agreement or any certificate, document or 
instrument delivered by or on behalf of Immunex in connection herewith;

                     (b)  any nonfulfillment of any covenant or agreement on 
the part of Immunex in this Agreement;

                     (c)  claims or causes of actions (including but not 
limited to for injuries or death of persons or damage to property) relating 
in any way to the Purchased Assets arising prior to the Closing, including 
but not limited to claims or causes of action relating to the manufacture, 
promotion, use, sale or distribution of Product;

                     (d)  claims or causes of actions (including but not 
limited to for injuries or death of persons or damage to property) arising 
subsequent to the Closing relating to the manufacture of Product (including 
Inventory) prior to the Closing;

                     (e)  any negligent or reckless actions by Immunex or its 
employees in connection with the fulfillment of its obligations set forth in 
this Agreement;

                     (f)  any other Non-Assumed Liabilities; 



                                    -10-
<PAGE>

                     (g)  non-compliance with the terms and conditions of any 
bulk sales laws with respect to the transactions contemplated by this 
Agreement; and    

                (ii) any and all Losses arising from the foregoing or to the 
enforcement of this Section 6.1(a).

           (b)  INDEMNIFICATION BY SUPERGEN.  SuperGen covenants and agrees 
to indemnify, defend, protect and hold harmless Immunex and its officers, 
directors, employees, stockholders, assigns, successors and Affiliates 
(individually, a "Immunex Indemnified Party" and collectively, the "Immunex 
Indemnified Parties") from, against and in respect of:

                (i)  all Losses suffered, sustained, incurred or paid by any 
Immunex Indemnified Party in connection with, resulting from or arising out 
of or relating to, directly or indirectly:

                     (a)  any breach of any representation or warranty of 
SuperGen set forth in this Agreement or any certificate or other writing 
delivered by SuperGen in connection herewith;

                     (b)  any nonfulfillment of any covenant or agreement on 
the part of SuperGen set forth in this Agreement; 

                     (c)  subject to Section 6.1(a)(i)(d), SuperGen's 
promotion, use, sale or distribution of Product after the Closing Date; and

                     (d)  any other Assumed Liability.

                (ii) any and all Losses arising from the foregoing or to the 
enforcement of this Section 6.1(b).

           (c)  All Claims for indemnification under this Section 6.1 shall 
be asserted and resolved as follows:  

                (i)   Any party that may be entitled to indemnification under 
this Agreement, (an "Indemnified Party") shall send a Claim Notice (as 
defined below) to the party obligated to indemnify it (an "Indemnifying 
Party") with reasonable promptness upon becoming aware of any claim or other 
facts upon which a claim for indemnification might be based.  If the 
Indemnifying Party does not notify the Indemnified Party within 30 days from 
the date of receipt of such Claim Notice that the Indemnifying Party disputes 
such claim, the amount of such claim shall be conclusively deemed a liability 
of the Indemnifying Party hereunder.  In case the Indemnifying Party shall 
object in writing to any claim made in accordance with this Section 6.1(c), 
the Indemnified Party shall have fifteen (15) days to respond in a written 
statement to the objection of the Indemnifying Party.  If after such fifteen 
(15) day period there remains a dispute as to any claims, the parties shall 
attempt in good faith for sixty (60) days to agree upon the rights of the 
respective parties with respect to each of such 

                                    -11-
<PAGE>

claims.  If the parties should so agree, a memorandum setting forth such 
agreement shall be prepared and signed by both parties.  If no such agreement 
can be reached by Immunex or SuperGen, then either party may, by written 
notice to the other, demand arbitration of the matter in accordance with the 
arbitration provision set forth in Section 8.10. 

                (ii)  In the event that any claim for which an Indemnifying 
Party would be liable to an Indemnified Party hereunder is asserted against 
an Indemnified Party by a third party, the Indemnified Party shall with 
reasonable promptness notify the Indemnifying Party of such claim, including 
a copy of the claim made if the claim was made in writing, specifying the 
nature of such claim and the amount or the estimated amount thereof to the 
extent then feasible (which estimate shall not be conclusive of the final 
amount of such claim) (the "Claim Notice").  The Indemnifying Party shall 
have 30 days from the receipt of the Claim Notice (the "Notice Period") to 
notify the Indemnified Party (i) whether or not the Indemnifying Party 
disputes the Indemnifying Party's liability to the Indemnified Party 
hereunder with respect to such claim and (ii) if the Indemnifying Party does 
not dispute such liability, whether or not the Indemnifying Party desires, at 
the sole cost and expense of the Indemnifying Party, to defend against such 
claim, provided that the Indemnifying Party is hereby authorized (but not 
obligated) prior to and during the Notice Period to file any motion, answer 
or other pleading and to take any other action which the Indemnifying Party 
shall deem necessary or appropriate to protect the Indemnifying Party's 
interests.  In the event that the Indemnifying Party notifies the Indemnified 
Party within the Notice Period that the Indemnifying Party does not dispute 
the Indemnifying Party's obligation to indemnify hereunder and desires to 
defend the Indemnified Party against such claim and except as hereinafter 
provided, the Indemnifying Party shall have the right to defend by 
appropriate proceedings, which proceedings shall be diligently settled or 
prosecuted by the Indemnifying Party to a final conclusion; PROVIDED that, 
unless the Indemnified Party otherwise agrees in writing, the Indemnifying 
Party may not settle any matter (in whole or in part) unless such settlement 
includes a complete and unconditional release of the Indemnified Party.  If 
the Indemnified Party desires to participate in, but not control, any such 
defense or settlement the Indemnified Party may do so at the Indemnified 
Party's sole cost and expense.  If the Indemnifying Party elects not to 
defend the Indemnified Party against such claim, whether by failure of the 
Indemnifying Party to give the Indemnified Party timely notice as provided 
above or otherwise, then the Indemnified Party, without waiving any rights 
against the Indemnifying Party, may settle or defend against any such claim 
in the Indemnified Party's sole discretion and the Indemnified Party shall be 
entitled to recover from the Indemnifying Party the amount of any settlement 
or judgment and, on an ongoing basis, all indemnifiable costs and expenses of 
the Indemnified Party with respect thereto, including interest from the date 
such costs and expenses were incurred.

                (iii)  Nothing herein shall be deemed to prevent an 
Indemnified Party from making a claim, and an Indemnified Party may make a 
claim hereunder, for potential or contingent claims or demands provided the 
Claim Notice sets forth the specific basis for any such potential or 
contingent claim or demand to the extent then feasible and an Indemnified 
Party has reasonable grounds to believe that such a claim or demand may be 
made.

                (iv)  The Indemnified Party's failure to give reasonably 
prompt notice to the Indemnifying Party of any actual, threatened or possible 
claim or demand which may give rise to a

                                    -12-
<PAGE>

right of indemnification hereunder shall not relieve the Indemnifying 
Party of any liability which the Indemnifying Party may have to the 
Indemnified Party unless the failure to give such notice materially and 
adversely prejudiced the Indemnifying Party.
     
     6.2   INDEMNIFICATION FOR BROKERAGE CLAIMS.  Immunex and SuperGen each 
represents that no broker or finder has been used in connection with the 
transactions contemplated by this Agreement and Immunex and SuperGen shall 
mutually indemnify the other against any claim for brokerage or like 
commission arising from each other's conduct or alleged conduct.

     6.3   SURVIVAL OF REPRESENTATIONS, WARRANTIES AND COVENANTS.  All 
representations, warranties and covenants (except for Section 5.5 which shall 
survive for six years) contained in this Agreement shall survive for a period 
of four years from the date hereof and thereafter shall be of no force or 
effect. Any claim for indemnification with respect thereto must be asserted 
by written notice to the Indemnifying Party prior to such date.

ARTICLE 7:  TERMINATION, AMENDMENT AND WAIVER

     7.1   TERMINATION.  This Agreement may be terminated at any time prior 
to the Closing Date:

           (a)   by mutual written consent of SuperGen and Immunex;

           (b)   by SuperGen or Immunex if the Closing shall not have 
occurred on or prior to February 1, 1997, provided, however, that a party 
shall not have the right to terminate under this Section 7.1(b) if such 
party's (or such party's Affiliates) failure to fulfill any obligation under 
this Agreement has been the cause of, or resulted in the failure of the 
Closing to occur on or before such date of any liability of such party to the 
other party hereunder for such failure;

           The date on which this Agreement is terminated pursuant to any of 
the foregoing subsections of this Section 7.1 is herein referred to as the 
"Termination Date."

     7.2   EFFECT OF TERMINATION.  Upon the termination of this Agreement 
pursuant to Section 7.1, this Agreement shall forthwith become null and void, 
except that nothing herein shall relieve any party from liability for breach 
of this Agreement prior to such termination.

ARTICLE 8:  GENERAL PROVISIONS

     8.1   PUBLIC STATEMENTS.  Except as may be required to comply with the 
requirements of applicable law, no press release or similar public 
announcement or communication will be made or caused to be made by the 
parties concerning the execution and delivery of this Agreement or the 
consummation of the transactions contemplated hereby, unless specifically 
approved in advance by the other party hereto.

                                    -13-
<PAGE>

     8.2   NOTICES.  All notices and other communications hereunder shall be 
in writing and shall be deemed to have been duly given if delivered 
personally, mailed by reputable overnight courier or certified mail (return 
receipt requested) or sent by telecopier (confirmed thereafter by certified 
mail) to the parties at the following addresses or at such other addresses as 
shall be specified by the parties by like notice:

           (a)    if to Immunex:

                  51 University Street
                  Seattle, Washington 98101
                  Attention:  Director of New Business
                  Telecopier Number:  [206] 587-0606

                  with a copy to:

                  Law Department
                  51 University Street
                  Seattle, Washington 98101
                  Attention:  General Counsel
                  Telecopier Number:  [206] 233-0644

            (b)   if to SuperGen addressed to:

                  SuperGen, Inc.
                  6450 Hollis Street
                  Emeryville, California  94608
                  Attention:  Chief Executive Officer
                  Telecopier Number: (510) 655-1098

                  with a copy to:

                  John V. Roos, Esq.
                  Wilson Sonsini Goodrich & Rosati
                  Two Palo Alto Square
                  Palo Alto, California 94306

     Notice so given shall (in the case of notice so given by mail) be deemed 
to be given and received on the third calendar day after mailing or the next 
business day if sent by a reputable overnight courier and (in the case of 
notice so given by telecopier or personal delivery) on the date of actual 
transmission or (as the case may be) personal delivery.

     8.3   RETURNS. Any returns of the Product sold before the Closing Date 
in the Territory, whether returned to SuperGen or Immunex, shall be for the 
account of Immunex.  Any returns of the Product sold after the Closing Date 
in the Territory, whether returned to SuperGen or Immunex, shall 

                                    -14-
<PAGE>

be for the account of SuperGen.  Any returns of the Product received by 
Immunex shall be promptly destroyed by Immunex, and Immunex shall notify 
SuperGen in writing within 30 days of its receipt and destruction of such 
returns with respect to Product owned by SuperGen.  Any returns of the 
Product received by SuperGen shall be promptly destroyed by SuperGen, and 
SuperGen shall notify Immunex in writing within 30 days of its receipt and 
destruction of such returns with respect to Product owned by Immunex.

     8.4   WAIVER.  Any waiver must be explicitly in writing.  A waiver of 
any breach or failure to enforce any of the terms or conditions of this 
Agreement shall not in any way affect, limit, or waive a party's rights at 
any time to enforce strict compliance thereafter with every term or condition 
of this Agreement.

     8.5   PARTIES IN INTEREST.  This Agreement shall not run to the benefit 
of or be enforceable by any person other than a party to this Agreement and, 
subject to Section 8.8, its successors and assigns provided, however, the 
persons entitled to indemnification under Article 6 shall be beneficiaries of 
such provisions.

     8.6   ENTIRE AGREEMENT; GOVERNING LAW; MISCELLANEOUS.  This Agreement 
(including the documents and instruments referred to herein) constitutes the 
entire agreement and supersedes all other prior agreements and undertakings, 
both written and oral, among the parties, or any of them, with respect to the 
subject matter hereof; is not intended to confer upon any other person any 
rights or remedies hereunder; and shall be governed in all respects, 
including validity, interpretation and effect, by the internal laws of the 
State of California without giving effect to the principles of conflicts of 
laws thereunder.  This Agreement may be executed in one or more counterparts 
which together shall constitute a single agreement.  If any provision of this 
Agreement shall be held to be illegal, invalid or unenforceable under any 
applicable law, then such contravention or invalidity shall not invalidate 
the entire Agreement.  Such provision shall be deemed to be modified to the 
extent necessary to render it legal, valid and enforceable, and if no such 
modification shall render it legal, valid and enforceable, then this 
Agreement shall be construed as if not containing the provision held to be 
invalid, and the rights and obligations of the parties shall be construed and 
enforced accordingly.

     8.7   EXPENSES.  All expenses, including the fees of any attorneys, 
accountants, investment bankers or others engaged by a party, incurred in 
connection with this Agreement and the transactions contemplated hereby, 
shall be paid by the party incurring such expenses whether or not the 
transactions contemplated by this Agreement are consummated.

     8.8   ASSIGNABILITY AND AMENDMENTS.  This Agreement may not be assigned 
by either party without the prior written consent of the other party, which 
consent shall not be unreasonably withheld, except that, subsequent to the 
Closing Date, either party may assign this Agreement to any of its 
Affiliates, provided, that such Affiliates agree to be bound by the 
provisions of this Agreement.  No such assignment will relieve the assigning 
party of any of its liabilities hereunder. This Agreement cannot be altered 
or otherwise amended except pursuant to an instrument in writing signed by 
each of the parties.

                                    -15-
<PAGE>

     8.9   CONFIDENTIALITY.  Each party hereby agrees, and shall cause its 
Affiliates to agree, that after the Closing Date, such party and its 
Affiliates shall hold in confidence and not disclose to any third Person, nor 
use for its own benefit any confidential or proprietary information of the 
other party or its Affiliates that is disclosed to or discovered by such 
party or its Affiliates in connection with the transactions contemplated 
hereby, unless (i) such information becomes known to the public generally 
through no fault of such party or its Affiliates or (ii) disclosure is 
required by law or the order of any Governmental Authority under color of law.

     8.10  ARBITRATION. All disputes or controversies (whether of law or 
fact) of any nature whatsoever arising from or relating to this Agreement and 
the transactions contemplated hereby shall be decided by the American 
Arbitration Association in accordance with the rules and regulations of that 
association. The arbitrators shall be selected as follows:  SuperGen and 
Immunex shall, within 30 days of the date of demand by either party for 
arbitration, each select one independent, qualified arbitrator and the two 
arbitrators so selected shall select the third arbitrator within 30 days 
after their appointment as party arbitrators.  Each party reserves the right 
to object to any individual arbitrator who shall be employed by or affiliated 
with a competing organization. In the event objection is made, the American 
Arbitration Association (the "Association") shall resolve any dispute 
regarding the propriety of an individual arbitrator acting in that capacity.  
The parties shall each bear the expenses of the arbitrator chosen by it, and 
shall bear one-half the expenses of the independent arbitrator.  Hearings in 
the proceeding shall commence within 120 days of the selection of the neutral 
arbitrator.  Arbitration shall take place in Alameda County, California.  At 
the request of either party, arbitration proceedings will be conducted 
confidentially; in such case all documents, testimony and records shall be 
received, heard and maintained by the arbitrators in confidence under seal, 
available for the inspection only by the Association, SuperGen and Immunex 
and their respective attorneys and their respective experts who shall agree 
in advance and in writing to receive all such information confidentially and 
to maintain such information in confidence.  The arbitrators, who shall act 
by majority vote, shall be able to decree any and all relief of an equitable 
and legal nature, including but not limited to such relief as a temporary 
restraining order, a temporary and/or a permanent injunction, and shall also 
be able to award damages, with or without an accounting and costs.  The 
decree or award rendered by the arbitrators may be entered as a final and 
binding judgment in any court having jurisdiction thereof.  Reasonable notice 
of the time and place of arbitration shall be given to all persons, other 
than the parties, as shall be required by law, in which case such persons or 
those authorized representatives shall have the right to attend and/or 
participate in all the arbitration hearings in such manner as the law shall 
require.  The resolution of conflicts procedures set forth in this Section 
8.10 are the parties' sole and exclusive methods for resolving disputes 
arising out of this Agreement.  Except as expressly set forth above, the 
parties agree to waive all rights to commence any action in law or equity 
arising out of this Agreement.

                                    -16-
<PAGE>

     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be 
executed as of the date first above written.

                                 IMMUNEX CORPORATION


                                 By: /s/ Edward V. Fritzky    
                                    ----------------------------------------
                                      Name:   Edward V. Fritzky    
                                      Title:  Chairman, Chief Executive Officer


                                 SUPERGEN INC.


                                 By: /s/ Hank Settle
                                    ----------------------------------------
                                      Name:  Hank Settle
                                      Title: Chief Financial Officer



                                    -17-
<PAGE>

                                             CONFIDENTIAL TREATMENT REQUESTED

                                    EXHIBIT A

                                    INVENTORY


PRODUCT:
                                                               Expiration
    NDC #          Description         Lot #     Quantity         Date
- ------------   -----------------      -------   -----------    ----------

58406-711-12   5ml multiple dose      EP10020      [*]            02/98 
                                      EP10030      [*]            02/98 
                                      EP10050      [*]            02/98 
                                      EP10060      [*]            03/98 
                                      EP10070      [*]            03/98 
                                      EP10080      [*]            03/98 
                                      EP10090      [*]            03/98 

                                        Total      [*]


58406-714-18   12.5ml multiple dose   EP20020      [*]            02/98
                                      EP20030      [*]            02/98
 
                                        Total      [*]


                                     RECORDS

Signed Application Form FDA 356h

Basis for ANDA Submission

Patent Certification and Exclusivity Statement

Comparison Between Generic Drug and Reference Listed Drug:

     1.   Conditions of Use

     2.   Active Ingredient(s)

     3.   Route of Administration, Dosage Form, and Strength


<PAGE>

Labeling

Bioavailability/Bioequivalence

     1.   IN VIVO Study Protocol(s) (N/A)

     2.   IN VIVO Study (N/A)

     3.   Request for Waiver of In Vivo Study(ies)

     4.   IN VITRO Dissolution Data (N/A)

     5.   Formulation Data (Comparison of all Strengths)

Components and Composition Statements

Raw Materials Controls

     1.   Active Ingredient(s)

          a.   Synthesis Listing Manufacturer/Supplier (Type II
               DMF authorization Letters)

          b.   Certificate(s) of Analysis specifications and test
               results from Drug Substance Manufacturer(s) (Including Material
               Safety Data Sheet)

          c.   Testing specifications and data (Lederle Monograph
               and COAs)

          d.   Spectra and Chromatograms for reference standards
               and test samples

          e.   Approved application for bulk antibiotic

     2.   Inactive Ingredients

          a.   Testing Specifications (Lederle Monographs)

          b.   Suppliers' & Lederle's Certificates of Analysis
               (Specifications and Results)

     3.   Standard Operating Procedures (SOPs)

          a.   Qualification of vendors

          b.   Acceptance Criteria

          c.   Retest Schedule


<PAGE>

          d.   Storage

Description of Manufacturing Facility

     1.   Full address(es) of the Facility(ies) for the Manufacturing
          Process, Testing, and Stability Testing

     2.   Brief Description of the Facility Including Sito Plan

     3.   eGMP Certification

     4.   Debarment Statement

Outside Firms Including Contract Testing Laboratories

     1.   Full Address

     2.   Functions

     3.   cGMP Certification/GLP (DMF Letters)

Manufacturing and Processing Instructions

     1.   Description of Manufacturing Process
          -    Aseptic Validation Package
          -    Process Flow Chart

     2.   Blank Batch Record(s) for Intended Production Runs with Equipment
          Specified

     3.   Reprocessing Statement

In-Process Controls

     1.   Copy of Executed Batch Record (AADA/Three Batches) with
          Equipment Specified, Including Packaging Records Reconciliation and
          Label Reconciliation

     2.   In Process

          a.   Sampling Plans and Testing Procedures

          b.   Specifications and Data (Including In-Process Sampling Report)

Packaging and Labeling Procedures

<PAGE>

Container

     1.   Summary of Container/Closure System

     2.   Components Specification and Test Data

          a.   Packaging Specification

          b.   Type III DMF References

     3.   Packaging Configurations and Sizes

     4.   Container/Closure Testing

Controls for the Finished Dosage Form

     1.   Sampling Plans and Test Procedures

     2.   Testing Specifications and Data (Including Monograph and
          COAs)

Analytical Methods (Three Additional Separate Bound Copies if the Drug Substance
and/or Drug Product are not USP Articles)

     1.   Methods for Drug Substance

          a.   Method Validation

          b.   Test Specifications and Data

     2.   Methods for Drug Product

          a.   Method Validation (Including APRs)

          b.   Stability-indicating test data of samples
               undergone various stress conditions

          c.   Test Specifications and Data

Stability of Finished Dosage Form

     1.   Protocol

     2.   Post Approval Commitments

     3.   Expiration Dating Period


<PAGE>

     4.   Stability Data Submitted

Control Numbers

     1.   For Raw Materials

     2.   For Production Batches

Samples - Sample Availability and Identification of:

     1.   Drug Substance

     2.   Finished Dosage Form

Environmental Impact Analysis Statement

Other

     1.   Reference to Previously Submitted Information (N/A)

     2.   Literature Publication for Which English Translation is
          Submitted (N/A)

     3.   Letters of Authorization (N/A)

     4.   DEA Statement (N/A)



<PAGE>

                                                           Exhibit 10.23




                STANDARD OFFER, AGREEMENT AND ESCROW
              INSTRUCTIONS FOR PURCHASE OF REAL ESTATE
                          (Non-Residential)

                                                   December 11, 1996
                                       (Date for Reference Purposes)

1.  BUYER.

    1.1  Supergen, Inc., (the "Buyer") hereby offers to purchase the real 
property, hereinafter described, from the owner thereof (the "Seller") 
(collectively, the "Parties" or individually, a "Party"), through an escrow 
(the "Escrow") to close on as provided in Paragraph "D" of Addendum "A" 
attached, (the "Expected Closing Date") to be held by First American Title 
Guaranty (the "Escrow Holder"), Escrow No. ______, whose address is 5199 
Johnson Drive, Suite 120, Pleasanton, CA 94588, Telecopier No. (510) 
463-9683, upon the terms and conditions set forth in this agreement (the 
"Agreement").  Buyer shall have the right to assign Buyer's rights hereunder, 
but any such assignment shall not relieve Buyer of Buyer's obligations herein 
unless the Seller expressly releases Buyer.

    1.2  The term "Date of Agreement" as used herein shall be the date when 
by execution and delivery (as defined in Paragraph 20.2) of this document or 
a subsequent counter-offer thereto, Buyer and Seller have reached Agreement 
in writing whereby Seller agrees to sell, and Buyer agrees to purchase, the 
Property upon terms accepted by both Parties.

2.  BROKER.

    2.1  The real estate broker or brokers presenting this Agreement to Seller
are: (Check applicable box(es).)

    Lee & Associates C.R.E.S. - Bob Kumnick, who, with respect to this
Agreement, represents:

      / /   the Buyer exclusively ("Buyer's Broker")
      / /   both Buyer and Seller,

and                                   , who, with respect to this Agreement
represents:

      / /    the Seller exclusively (the "Seller's Broker")
      / /    both the Seller and Buyer,

(the "Broker(s)"), all such named Broker(s) being the procuring cause(s) of 
this Agreement.  See Paragraph 26 for Disclosures Regarding the Nature of a 
Real Estate Agency Relationship.  Buyer shall use the services of Buyers' 
Broker exclusively in connection with any and all negotiations and offers 
with respect to the property described in Paragraph 3.1 for a period of one 
year from the date above.

    2.2  Buyer and Seller each represent and warrant to the other that 
he/she/it has had no dealings with any person, firm, broker or finder in 
connection with the negotiation of this Agreement and/or the consummation of 
the purchase and sale contemplated herein, other than the Broker(s) named in 
Paragraph 2.1, and no broker or other person, firm or entity, other than said 
Broker(s) is/are entitled to any commission or finder's fee in connection 
with this transaction as the result of any dealings or acts of such Party.  
Buyer and Seller do each hereby agree to indemnify, defend, protect and hold 
the other harmless from and against any costs, expenses or liability for 

<PAGE>

compensation, commission, or charges which may be claimed by any broker, 
finder, or other similar party, other than said named Broker(s) by reason of 
any dealings or act of the indemnifying Party.

3.  PROPERTY.

    3.1  The real Property (the "Property") that is the subject of this offer 
consists of  9,600+ square foot shell building (Refer to Exhibit A, 
attached), is located in the City of Pleasanton, County of Alameda, State of 
California, and is commonly known by the street address of 1059 Serpentine 
Lane, and is legally described as industrial condominium, as described in 
Condominium Plan in Exhibits "A" and "B" (Building "B"; Unit "B").

    3.2  If the legal description of the Property is not complete or is 
inaccurate, this Agreement shall not be invalid and the legal description 
shall be completed or corrected to meet the requirements of First American 
Title Guaranty (the "Title Company"), which Title Company shall issue the 
title policy hereinafter described.

    3.3  The Property includes, at no additional cost to Buyer, the permanent 
improvements thereon, including those items which the law of the state in 
which the Property is located provides is part of the Property, as well as 
the following items, if any, owned by Seller and presently located in the 
Property: electrical distribution systems (power panels, buss ducting, 
conduits, disconnects, lighting fixtures), telephone  distribution systems 
(lines, jacks and connections), space heaters, air conditioning equipment, 
air lines, carpets, window coverings, wall coverings, and none other 
(collectively, the "Improvements").

    3.4  If the Property is located in the State of California, the Broker(s) 
is/are required under the Alquist-Priolo Special Studies Zones Act, to 
disclose to a prospective purchaser of real property whether the property 
being purchased is located within a delineated special studies zone (a zone 
that encompasses a potentially or recently active trace of an earthquake 
fault that is deemed by the State Geologist to be sufficiently active and 
well defined enough to constitute a potential hazard to structures from 
surface faulting or fault creep).  If the Property is located within such a 
special studies zone, its development may require a geologic report from a 
state registered geologist.  In accordance with such law, the Broker(s) 
hereby inform(s) Buyer that the Property:

         (a)  is not within such a special studies zone.
         (b)  is within such a special studies zone.

4.  PURCHASE PRICE.

    4.1  The purchase price (the "Purchase Price") to be paid by Buyer to
Seller for the Property shall be $744,000.00 payable as follows:  

**to be determined between Buyer and bank

              (a) Cash down payment, including the Deposit 
              as defined in paragraph 5.3 or if an 
              all cash transaction, the Purchase Price):   $114,000.00*
                                                           ------------
(Strike       (b) Amount of "New Loan" as defined in       
if not        paragraph 6.1
applicable)   if any:                                      $630,000.00
                                                           ------------




    4.2  If an Existing Deed of Trust permits the beneficiary thereof to 
require payment of a transfer fee as a condition to the transfer of the 
Property subject to such Existing Deed of Trust, Buyer agrees to pay transfer 
fees and costs of up to one and one-half percent (1-1/2%) of the unpaid 
principal balance of the applicable Existing Note.

                                        -2-

<PAGE>

5.  DEPOSITS.

    5.1  Buyer hereby delivers a check in the sum of $10,000.00, payable to 
First American Title, to be (CHECK APPLICABLE BOX) /  / forthwith deposited in 
the payee's trust account or /  / held uncashed until the Date of Agreement.  
When cashed, the check shall be deposited into the payee's trust account to 
be applied toward the Purchase Price of the Property at the Closing, as 
defined in Paragraph 7.3  Should Buyer and Seller not enter into an agreement 
for purchase and sale, Buyer's check or funds shall, upon request by Buyer, 
be promptly returned to Buyer.

    5.2  Within five (5) business days after the Date of Agreement, Buyer 
shall deposit with Escrow Holder the additional sum of $0.00*, to be applied 
to the Purchase Price at the Closing.  *See Addendum A for additional deposit 
information.

    5.3  The funds deposited with Escrow Holder by or on behalf of Buyer 
under Paragraphs 5.1 and 5.2 above (collectively the "Deposit"), shall be 
deposited by Escrow Holder in such State or Federally chartered bank as Buyer 
may select and in such interest-bearing account or accounts as Escrow Holder 
or Broker(s) deem appropriate and consistent with the timing requirements of 
this transaction. The interest therefrom shall accrue to the benefit of 
Buyer, who hereby acknowledges that there may be penalties or interest 
forfeitures if the applicable instrument is redeemed prior to its specified 
maturity.  Buyer's Federal Tax Identification Number is to be provided later.

6.  FINANCING CONTINGENCY.  (STRIKE IF NOT APPLICABLE)

    6.1  This offer is contingent upon Buyer obtaining from an insurance 
company, bank, savings and loan association or other financial institution, 
or from any correspondent or agent thereof, a commitment to lend to Buyer a 
sum not less than $630,000.00 at a fixed interest rate not to exceed 10% per 
annum, payable in equal monthly installments, including interest, amortized 
over a period of not less than 20 years and all due in not less than 10 
years, or at a variable interest rate commencing at an interest rate not to 
exceed ___ per annum, amortized over a period of not less than ___  years and 
all due in not less than ___ years, and in either case, with loan fees not to 
exceed ___ of the amount of the new loan (the "New Loan").  The New Loan 
shall be secured by a first deed of trust upon the Property and shall be upon 
the following additional terms and conditions:  None other than above, and 
upon such other terms and conditions as are usually required by such lender.

    6.2  Buyer hereby agrees to diligently pursue obtaining the New Loan.  If 
Buyer shall fail to notify its Broker, Escrow Holder and Seller, in writing 
within 60 days following the Date of Agreement, that the New Loan has not 
been obtained, it shall be conclusively presumed that Buyer has either 
obtained said New Loan or has waived this New Loan contingency.

    6.3  If, after due diligence, Buyer shall notify its Broker, Escrow 
Holder and Seller, in writing, within the time specified in Paragraph 6.2 
hereof, that Buyer has not obtained said new Loan, this Agreement shall be 
terminated, and Buyer shall be entitled to the prompt return of Buyer's 
Deposit and any other funds deposited by or for Buyer with Escrow Holder or 
Seller, plus any interest earned thereon, less only Escrow Holder and Title 
Company cancellation fees and costs, which Buyer shall pay.

7.  ESCROW AND CLOSING

    7.1  Upon acceptance hereof by Seller, this Agreement, including any 
counter-offers incorporated herein by the Parties, shall constitute not only 
the agreement of purchase and sale between Buyer and Seller, but also 
instructions to Escrow Holder for the consummation of the Agreement through 
the Escrow. Escrow Holder shall not 


                                        -3-

<PAGE>

prepare any further escrow instructions restating or amending this Agreement 
unless specifically so instructed by the Parties of a Broker herein.

    7.2  Escrow Holder is hereby authorized and instructed to conduct the 
Escrow in accordance with this Agreement, applicable law, custom and practice 
of the community in which Escrow Holder is located, including any reporting 
requirements of the Internal Revenue Code.  In the event of a conflict 
between the law of the state where the Property is located and the law of the 
state where the Escrow Holder is located, the law of the state where the 
Property is located shall prevail.

    7.3  Subject to satisfaction of the contingencies herein described, 
Escrow Holder shall close this escrow (the "Closing") by recording the grant 
deed and other documents required to be recorded and by disbursing the funds 
and documents in accordance with this Agreement.

    7.4  If this transaction is terminated for non-satisfaction and 
non-waiver of a Buyer's Contingency, as defined in Paragraph 8.4, then 
neither of the Parties shall thereafter have any liability to the other under 
this Agreement, except to the extent of the breach of any affirmative 
covenant or warranty in this Agreement that may have been involved.  In the 
event of such termination, Buyer shall be promptly refunded all funds 
deposited by or on behalf of Buyer with a Broker, Escrow Holder or Seller, 
less only Title Company and Escrow Holder cancellation fees and costs, all of 
which shall be Buyer's obligation.

    7.5  The Closing shall occur on the Expected Closing Date, or as soon 
thereafter as the Escrow is in condition for Closing; provided, however, that 
if the Closing does not occur by the Expected Closing Date and the Expected 
Closing Date is not extended by mutual instructions of the Parties, a Party 
hereto not then in default under this Agreement may notify the other Party, 
Escrow Holder, and Broker(s) in writing that, unless the Closing occurs 
within five (5) business days following said notice, the Escrow and this 
Agreement shall be deemed terminated without further notice or instructions.

    7.6  Should the Closing not occur during said five (5) day period, this 
Agreement and Escrow shall be deemed terminated and Escrow Holder shall 
forthwith return all monies and documents, less only Escrow Holder's 
reasonable fees and expenses, to the Party who deposited them.  Such Party 
shall indemnify and hold Escrow Holder harmless in connection with such 
return.  However, no refunds or documents shall be returned to a party 
claimed by written notice to Escrow Holder to be in default under this 
Agreement.

    7.7  Except as otherwise provided herein, the termination of Escrow and 
this Agreement and/or the return of deposited funds or documents shall not 
relieve or release either Buyer or Seller from any obligation to pay Escrow 
Holder's fees and costs or constitute a waiver, release or discharge of any 
breach or default that has occurred in the performance of the obligations, 
agreements, covenants or warranties contained herein.

    7.8  If this Agreement terminates for any reason other than Seller's 
breach or default, then at Seller's request, and as a condition to the return 
of Buyer's deposit, Buyer shall within five (5) days after written request 
deliver to Seller, at no charge, copies of all surveys, engineering studies, 
soil reports, maps, master plans, feasibility studies and other similar items 
prepared by or for Buyer that pertain to the Property.

8.  CONTINGENCIES TO CLOSING.

    8.1  The Closing of this transaction is contingent upon the satisfaction 
or waiver of the following contingencies:


                                        -4-
<PAGE>

         (a)  DISCLOSURE.  Buyer's receipt and written approval, within ten 
(10) days after delivery to Buyer, of a completed Property Information Sheet 
(the "Property Information Sheet"), concerning the Property, duly executed by 
or on behalf of Seller in the current form or equivalent to that published  
by the American Industrial Real Estate Association (the "A.I.R.").  Seller 
shall provide Buyer with the Property Information Sheet within ten (10) days 
following the Date of Agreement.

         (b)  PHYSICAL INSPECTION.  Buyer's written approval, within ten (10) 
days following the later of the Date of Agreement or receipt by Buyer of the 
Property Information Sheet, of an inspection by Buyer, at Buyer's expense, of 
the physical aspects of the Property.

         (c)  HAZARDOUS SUBSTANCE CONDITIONS REPORT.  Buyer's written 
approval, within thirty (30) days following the later of the Date of 
Agreement or receipt by Buyer of the Property Information Sheet, of a 
Hazardous Substance Conditions report concerning the Property and relevant 
adjoining properties.  Such report will be obtained at Buyer's direction and 
expense.  A "Hazardous Substance" for purposes of this Agreement is defined 
as any substance whose nature and/or quantity of existence, use, manufacture, 
disposal or effect, render it subject to Federal, state or local regulation, 
investigation, remediation or removal as potentially injurious to public 
health or welfare.  A "Hazardous Substance Condition" for purposes of this 
Agreement is defined as the existence on, under or relevantly adjacent to the 
Property of a Hazardous Substance that would require remediation and/or 
removal under applicable Federal, state or local law.

         (d)  SOIL INSPECTION.  Buyer's written approval, within thirty (30) 
days after the later of the Date of Agreement or receipt by Buyer of the 
Property Information Sheet, of a soil test report concerning the Property.  
Said report shall be obtained at Buyer's direction and expense.  Seller shall 
promptly provide to Buyer copies of any existing soils reports that Seller 
may have.

         (e)  CONDITION OF TITLE.  Buyer's written approval of a current 
preliminary title report concerning the Property (the "PTR") issued by the 
Title Company, as well as all documents (the "Underlying Documents") referred 
to in the PTR, and the issuance by the Title Company of the title policy 
described in Paragraph 9.1.  Seller shall cause the PTR and all Underlying 
Documents to be delivered to Buyer promptly after the Date of Agreement.  
Buyer's approval is to be given within ten (10) days after receipt of said 
PTR and legible copies of all Underlying Documents.  The disapproval by Buyer 
of any monetary encumbrance, which by the terms of this Agreement is not to 
remain against the Property after the Closing, shall not be considered a 
failure of this condition, as Seller shall have the obligation, at Seller's 
expense, to satisfy and remove such disapproved monetary encumbrance at or 
before the Closing.

         (f)  SURVEY.  Buyer's written approval, within thirty (30) days 
after receipt of the PTR and Underlying Documents, of an ALTA title 
supplement based upon a survey prepared to American Land Title Association 
(the "ALTA") standards for an owner's policy by a licensed surveyor, showing 
the legal description and boundary lines of the Property, any easements of 
record, and any improvements, poles, structures, and things located within 
ten feet (10') either side of the Property boundary lines.  The survey shall 
be prepared at Buyer's direction and expense.  If Buyer has obtained a survey 
and approved the ALTA title supplement, Buyer may elect within the period 
allowed for Buyer's approval of a survey to have an ALTA extended coverage 
owner's form of title policy, in which event Buyer shall pay any additional 
premium attributable thereto.

         (g)  EXISTING LEASES AND TENANCY STATEMENTS.  Buyer's written 
approval, within ten (10) days after receipt of legible copies of all leases, 
subleases or rental arrangements (collectively, the "Existing Leases") 
affecting the Property, and a statement (the "Tenancy Statement") in the 
latest form or equivalent to that published 

                                        -5-

<PAGE>

by the A.I.R., executed by Seller and each tenant and subtenant of the 
Property.  Seller shall use its best efforts to provide Buyer with said 
Existing Leases and Tenancy Statements promptly after the Date of Agreement.

         (h)  OTHER AGREEMENTS.  Buyer's written approval, within ten (10) 
days after receipt, of a copy of any other agreements ("Other Agreements") 
known to Seller that will affect the Property beyond the Closing.  Seller 
shall cause said copies to be delivered to Buyer promptly after the Date of 
Agreement.

         (i)  FINANCING.  If Paragraph 6 hereof dealing with a financing 
contingency has not been stricken, the satisfaction or waiver of such New 
Loan contingency.

         (j)  EXISTING NOTES.  If Paragraph 4.1(c) has not been stricken, 
Buyer's written approval, within ten (10) days after receipt, of conformed 
and legible copies of the Existing Notes, Existing Deeds of Trust and related 
agreements (collectively, the "Loan Documents") to which the Property will 
remain subject after the Closing, including a beneficiary statement (the 
"Beneficiary Statement") executed by the holders of the Existing notes 
confirming: (1) the amount of the unpaid principal balance, the current 
interest rate, and the date to which interest is paid, and (2) the nature and 
amount of any impounds held by the beneficiary in connection with said loan.  
Seller shall use its best efforts to provide Buyer with said Loan Documents 
and Beneficiary Statement promptly after the Date of Agreement.  Buyer's 
obligation to close is further conditioned upon Buyer's being able to 
purchase the Property without acceleration or change in the terms of any 
Existing Notes or charges to Buyer except as otherwise provided by this 
Agreement or approved by Buyer, provided, however, Buyer shall pay the 
transfer fee referred to in Paragraph 4.2 hereof.

         (k)  DESTRUCTION, DAMAGE OR LOSS.  There shall not have occurred 
prior to the Closing, a destruction of, or damage or loss to, the Property or 
any portion thereof, from any cause whatsoever, which would cost more than 
$10,000.00 to repair or cure.  If the cost of repair or cure is $10,000.00 or 
less Seller shall repair or cure the loss prior to the Closing.  Buyer shall 
have the option, within ten (10) days after receipt of written notice of a 
loss costing more than $10,000.00 to repair or cure, to either terminate this 
transaction or to purchase the Property notwithstanding such loss, but 
without deduction or offset against the Purchase Price. If the cost to repair 
or cure is more than $10,000.00, and Buyer does not elect to terminate this 
transaction, Buyer shall be entitled to any insurance proceeds applicable to 
such loss. Unless otherwise notified in writing by either Party or Broker, 
Escrow Holder shall assume no destruction, damage or loss costing more than 
$10,000.00 to repair or cure has occurred prior to Closing.

         (l)  MATERIAL CHANGE.  No Material Change, as hereinafter defined, 
shall have occurred with respect to the Property that has not been approved 
in writing by Buyer.  For purposes of this Agreement, a "Material Change" 
shall be a change in the status of the use, occupancy, tenants or condition 
of the Property as reasonably expected by the Buyer, that occurs after the 
date of this offer and prior to the Closing.  Buyer shall have ten (10) days 
following receipt of written notice from any source of any such Material 
Change within which to approve or disapprove same.  Unless otherwise notified 
in writing by either Party or Broker, Escrow Holder shall assume that no 
Material Change has occurred prior to the Closing.

         (m)  SELLER PERFORMANCE.  The delivery of all documents and the due 
performance by Seller of each and every undertaking and agreement to be 
performed by Seller under this Agreement.

         (n)  BREACH OF WARRANTY.  That each representation and warranty of 
Seller herein be true and correct as of the Closing.  Escrow Holder shall 
assume that this condition has been satisfied unless notified to the contrary 
in writing by Buyer or Broker(s) prior to the Closing.

                                        -6-
<PAGE>


         (o)  BROKER'S FEE.  Payment at the Closing of such Broker's Fee as 
is specified in this Agreement or later written instructions to Escrow Holder 
executed by Seller and Broker(s).  It is agreed by Buyer, Seller and Escrow 
Holder that Broker(s) is/are a third party beneficiary of this Agreement 
insofar as the Broker's fee is concerned, and that no change shall be made by 
Buyer, Seller or Escrow Holder with respect to the time of payment, amount of 
payment, or the conditions to payment of the Broker's fee specified in this 
Agreement, without the written consent of Broker(s).

    8.2  All of the contingencies specified in Subparagraphs (a) through (n) 
of Paragraph 8.1 are for the benefit of, and may be waived by, Buyer, and may 
be elsewhere herein referred to as "Buyer Contingencies."

    8.3  If Buyer shall fail, within the applicable time specified, to 
approve or disapprove in writing to Escrow Holder, Seller and the other 
Party's Broker(s), any item, matter or document subject to Buyer's approval 
under the terms of this Agreement, it shall be conclusively presumed that 
Buyer has approved such item, matter or document.  Buyer's conditional 
approval shall constitute a disapproval, unless provision is made by Seller 
within the time specified therefor by the Buyer in the conditional approval, 
or by this Agreement, whichever is later, for the satisfaction of the 
condition imposed by the Buyer.

    8.4  If any Buyer's Contingency is not satisfied, or if Buyer disapproves 
any matter subject to its approval within the time period applicable thereto 
("Disapproved Item"), Seller shall have the right within ten (10) days 
following the expiration of the time period applicable to such Buyer 
Contingency or receipt of notice of Buyer's disapproval, as the case may be, 
to elect to cure such Disapproved Item prior to the Expected Closing Date 
("Seller's Election"). Seller's failure to give to Buyer within said ten (10) 
day period, written notice of Seller's commitment to cure such Disapproved 
Item on or before the Expected Closing Date shall be conclusively presumed to 
be Seller's Election not to cure such Disapproved Item.  If Seller elects, 
either by written notice or failure to give written notice, not to cure a 
Disapproved Item, Buyer shall have the election, within ten (10) days after 
Seller's election, to either accept title to the Property subject to that 
Disapproved Item, or to terminate this transaction.  Buyer's failure to elect 
termination by written notice to Seller within said ten (10) day period shall 
constitute Buyer's election to accept title to the Property subject to that 
Disapproved Item without deduction or offset.  Unless expressly provided 
otherwise herein, Seller's right to cure shall not apply to Hazardous 
Substance Conditions referenced in Paragraph 8.1(c) or to the Financing 
Contingency set forth in Paragraph 6.  Unless the parties mutually instruct 
otherwise, if the time periods for the satisfaction of contingencies or for 
Seller's and Buyer's said Elections would expire on a date after the Expected 
Closing Date, the expected Closing Date shall be deemed extended to coincide 
with the expiration of three (3) business days following the expiration of: 
(a) the applicable contingency period(s); (b) the period within which Seller 
may elect to cure the Disapproved Item; or (c) if Seller elects not to cure, 
the period within which Buyer may elect to terminate this transaction, 
whichever is later.

    8.5  Buyer understands and agrees that until such time as all Buyer's 
Contingencies have been satisfied or waived, Seller and/or its agents may 
solicit, entertain and/or accept back-up offers to purchase the subject 
Property in the event the transaction covered by this Agreement is not 
consummated.

    8.6  As defined in Subparagraph 8.1(c), Buyer and Seller acknowledge that 
extensive local, state and Federal legislation establish broad liability upon 
owners and/or users of real property for the investigation and remediation of 
a Hazardous  Substance Condition.  The determination of the existence of a 
Hazardous Substance Condition and the evaluation of the impact of such a 
condition are highly technical and beyond the expertise of Broker(s).  Buyer 
and Seller acknowledge that they have been advised by Broker(s) to consult 
their own technical and legal experts with respect to the possible Hazardous 
Substance Condition aspects of this Property or adjoining properties, and 
Buyer and Seller are not relying upon any investigation by or statement of 
Broker(s) with respect

                                        -7-

<PAGE>

thereto.  Buyer and Seller hereby assume all responsibility for the impact of 
such Hazardous Substance Conditions upon their respective interests herein.

9.  DOCUMENTS REQUIRED AT CLOSING.

    9.1  Escrow Holder shall cause to be issued to Buyer a standard coverage 
(or ALTA extended, if so elected under Paragraph 8.1(f)) owner's form policy 
of title insurance effective as of the Closing, issued by the Title Company 
in the full amount of the Purchase Price, insuring title to the Property 
vested in Buyer, subject only to the exceptions approved by Buyer.  In the 
event there is a Purchase Money Deed of Trust in this transaction, the policy 
of title insurance shall be a joint protection policy insuring both Buyer and 
Seller.

    9.2  Seller shall deliver or cause to be delivered to Escrow Holder in 
time for delivery to Buyer at the Closing, an original ink-signed:

         (a)  Grant deed (or equivalent), duly executed and in recordable 
form, conveying fee title to the  Property to Buyer.

         (b)  If Paragraph 4.1(c) has not been stricken, the Beneficiary 
Statements concerning Existing Note(s).

         (c)  If applicable, the Existing Leases and Other Agreements 
together with duly executed assignments thereof by Seller and Buyer.  The 
assignment of Existing Leases shall be on the most recent Assignment and 
Assumption of Lessor's Interest in Lease form published by the A.I.R. or its 
equivalent.

         (d)  If applicable, the Tenancy Statements executed by Seller and 
the Tenant(s) of the Property.

         (e)  An affidavit executed by Seller to the effect that Seller is 
not a "foreign person" within the meaning of Internal Revenue Code Section 
1445 or successor statutes.  If Seller does not provide such affidavit in 
form reasonably satisfactory to Buyer at least three (3) business days prior 
to the Closing, Escrow Holder shall at the Closing deduct from Seller's 
proceeds and remit to Internal Revenue Service such sum as is required by 
applicable Federal law with respect to purchases from foreign sellers.

    9.3  Buyer shall deliver or cause to be delivered to Seller through 
escrow:

         (a)  The cash portion of the Purchase Price and such additional sums 
as are required of Buyer under this Agreement for prorations, expenses and 
adjustments.  The balance of the cash portion of the Purchase Price, 
including Buyer's escrow charges and other cash charges, if any, shall be 
deposited by Buyer with Escrow Holder, by cashier's check drawn upon a local 
major banking institution, federal funds wire transfer, or any other method 
acceptable to Escrow Holder as immediately collectable funds, no later than 
11:00 A.M. on the business day prior to the Expected Closing Date.

         (b)  If a Purchase Money Note and Purchase Money Deed of Trust are 
called for by this Agreement, the duly executed originals of those documents, 
the Purchase Money Deed of Trust being in recordable form, together with 
evidence of fire insurance on the improvements in the amount of the full 
replacement cost naming Seller as a mortgage loss payee, and a real estate 
tax service contract (at Buyer's expense), assuring Seller of notice of the 
status of payment of real property taxes during the life of the Purchase 
Money Note.

                                        -8-

<PAGE>


         (c)  The assumption portion of the Assignment and Assumption of 
Lessor's Interest In Lease form specified in Paragraph 9.2(c) above, duly 
executed by Buyer with respect to the obligations of the Lessor accruing 
after the Closing as to each Existing Lease.

         (d)  Assumptions duly executed by Buyer of the obligations of Seller 
that accrue after Closing under any Other Agreements.

         (e)  If applicable, a written assumption duly executed by Buyer of 
the loan documents with respect to Existing Notes.

10. PRORATIONS, EXPENSES AND ADJUSTMENTS.

    10.1 TAXES.  Real property taxes payable by the owner of the Property 
shall be prorated through Escrow as of the date of the Closing, based upon 
the latest tax bill available.  The Parties agree to prorate, as of the 
Closing, any taxes assessed against the Property by supplemental bill levies 
by reason of events occurring prior to the Closing.  Payment shall be made 
promptly in cash upon receipt of a copy of any such supplemental bill of the 
amount necessary to accomplish such proration.

    10.2 INSURANCE.  If Buyer elects to take an assignment of the existing 
casualty and/or liability insurance that is maintained by Seller, the current 
premium therefor shall be prorated through Escrow as of the date of Closing.

    10.3 RENTALS, INTEREST AND EXPENSES.  Collected rentals, interest on 
Existing Notes, utilities, and operating expenses shall be prorated as of the 
date of Closing.  The Parties agree to promptly adjust between themselves, 
outside of Escrow, any rents received after the Closing.

    10.4 SECURITY DEPOSIT.  Security Deposits held by Seller shall be given 
to Buyer by a credit to the cash required of Buyer at the Closing.

    10.5 POST CLOSING MATTERS.  Any item to be prorated that is not 
determined or determinable at the Closing shall be promptly adjusted by the 
Parties by appropriate cash payment outside of the Escrow when the amount due 
is determined.

    10.6 VARIATIONS IN EXISTING NOTE BALANCES.  In the event that Buyer is 
taking title to the Property subject to an Existing Deed of Trust(s), and in 
the event that a Beneficiary Statement as to the applicable Existing Note(s) 
discloses that the unpaid principal balance of such Existing Note(s) at the 
Closing will be more or less than the amount set forth in paragraph 4.1(c) 
hereof (the Existing Note Variation), then the Purchase Money Note(s) shall 
be reduced or increased by an amount equal to such Existing Note Variation.  
If there is to be no Purchase Money Note, the cash required at the Closing 
per Paragraph 4.1(a) shall be reduced or increased by the amount of such 
Existing Note Variation.

    10.7 VARIATIONS IN NEW LOAN BALANCE.  In the event Buyer is obtaining a 
New Loan and in the event that the amount of the New Loan actually obtained 
is greater than the amount set forth in Paragraph 6.1 hereof, the Purchase 
Money Note, if one is called for in this transaction, shall be reduced by the 
excess of the actual face amount of the New Loan over such amount as 
designated in Paragraph 6.1 hereof.

                                        -9-
<PAGE>


11. REPRESENTATION AND WARRANTIES OF SELLER AND DISCLAIMER.

    11.1 Seller's warranties and representations shall survive the Closing 
and delivery of the deed, and, unless otherwise noted herein, are true, 
material and relied upon by Buyer and Broker(s) in all respects, both as of 
the Date of Agreement, and as of the date of Closing.  Seller hereby makes 
the following warranties and representations to Buyer and Broker(s):

         (a)  AUTHORITY OF SELLER.  Seller is the owner of the Property 
and/or has the full right, power and authority to sell, convey and transfer 
the Property to Buyer as provided herein, and to perform Seller's obligations 
hereunder.

         (b)  MAINTENANCE DURING ESCROW AND EQUIPMENT CONDITION AT CLOSING. 
Except as otherwise provided in Paragraph 7.1(k) hereof dealing with 
destruction, damage or loss, Seller shall maintain the Property until the 
Closing in its present condition, ordinary wear and tear excepted.  The 
heating, ventilating, air conditioning, plumbing, loading doors and 
electrical systems shall be in good operating order and condition at the time 
of Closing.

         (c)  HAZARDOUS SUBSTANCES/STORAGE TANKS.  Seller has no knowledge, 
except as otherwise disclosed to Buyer in writing, of the existence or prior 
existence on the Property of any Hazardous Substance (as defined in Paragraph 
8.1(c)), nor of the existence or prior existence of any above or below ground 
storage tank or tanks.

         (d)  COMPLIANCE.  Seller has no knowledge of any aspect or condition 
of the Property which violates applicable laws, rules, regulations, codes, or 
covenants, conditions or restrictions, or of improvements or alterations made 
to the Property without a permit where one was required, or of any 
unfulfilled order or directive of  any applicable governmental agency or 
casualty insurance company, that any work of investigation, remediation, 
repair, maintenance or improvement is to be performed on the Property.

         (e)  CHANGES IN AGREEMENTS.  Prior to the Closing, Seller will not 
violate or modify, orally or in writing, any Existing Lease or Other 
Agreement, or create any new leases or other agreements affecting the 
Property, without Buyer's written approval, which approval will not be 
unreasonably withheld.

         (f)  POSSESSORY RIGHTS.  Seller has no knowledge that anyone will, 
at the Closing, have any right to possession of the Property, except as 
disclosed by this Agreement or otherwise in writing to Buyer.

         (g)  MECHANICS' LIENS.  There are no unsatisfied mechanics' or 
materialmans' lien rights concerning the Property.

         (h)  ACTIONS, SUITS OR PROCEEDINGS.  Seller has no knowledge of any 
actions, suits or proceedings pending or threatened before any commission, 
board, bureau, agency, instrumentality, arbitrator(s) court or tribunal that 
would affect the Property or the right to occupy or utilize same.

         (i)  NOTICE OF CHANGES.  Seller will promptly notify Buyer and 
Broker(s) in writing of any Material Change (as defined in Paragraph 8.1(l)) 
affecting the Property that becomes known to Seller prior to the Closing.

         (j)  NO TENANT BANKRUPTCY PROCEEDINGS.  Seller is not the subject of 
a bankruptcy or insolvency proceeding.


                                        -10-

<PAGE>

         (k)  NO SELLER BANKRUPTCY PROCEEDINGS.  Seller is not the subject of 
a bankruptcy, insolvency or probate proceeding.

    11.2 Buyer hereby acknowledges that, except as otherwise stated in this 
Agreement, Buyer is purchasing the Property in its existing condition and 
will, by the time called for herein, make or have waived all inspections of 
the Property Buyer believes are necessary to protect its own interest in and 
its contemplated use of, the Property.  The Parties acknowledge that, except 
as otherwise stated in this Agreement, no representations, inducements, 
promises, agreements, assurances, oral or written, concerning the Property, 
or any aspect of the Occupational Safety and Health Act, hazardous substance 
laws, or any other act, ordinance or law, have been made by either Party or 
Broker, or relied upon by either Party hereto.

12. POSSESSION.

    12.1 Possession of the Property shall be given to Buyer at the Closing 
subject to the rights of tenants under Existing Leases.

13. BUYERS' ENTRY.

    13.1 At any time during the Escrow period, Buyer, and its agents and 
representatives, shall have the right at reasonable times and subject to 
rights of tenants under Existing Leases, to enter upon the Property for the 
purpose of making inspections and tests specified in this Agreement.  
Following any such entry or work, unless otherwise directed in writing by 
Seller, Buyer shall return the Property to the condition it was in prior to 
such entry or work, including the recompaction or removal of any disrupted 
soil or material as Seller may reasonably direct.  All such inspections and 
tests and any other work conducted or materials furnished with respect to the 
Property by or for Buyer shall be paid for by Buyer as and when due and Buyer 
shall indemnify, defend, protect and hold harmless Seller and the Property of 
and from any and all claims, liabilities, demands, losses, costs, expenses 
(including reasonable attorneys' fees), damages or recoveries, including 
those for injury to person or property, arising out of or relating to any 
such work or materials or the acts or omissions of Buyer, its agents or 
employees in connection therewith.

14. FURTHER DOCUMENTS AND ASSURANCES.

    14.1 Buyer and Seller shall each, diligently and in good faith, undertake 
all actions and procedures reasonably required to place the Escrow in 
condition for Closing as and when required by this Agreement.  Buyer and 
Seller agree to provide all further information, and to execute and deliver 
all further documents and instruments, reasonably required by Escrow Holder 
or the Title Company. 

15. ATTORNEYS' FEES.

    15.1 In the event of any litigation or arbitration between the Buyer, 
Seller, and Broker(s), or any of them, concerning this transaction, the 
prevailing party shall be entitled to reasonable attorneys' fees and costs.  
The attorneys' fee award shall not be computed in accordance with any court 
fee schedule, but shall be such as to fully reimburse all attorneys fees 
reasonably incurred in good faith.

16. PRIOR AGREEMENTS/AMENDMENTS.

    16.1 The contract in effect as of the Date of Agreement supersedes any 
and all prior agreements between Seller and Buyer regarding the Property.

                                        -11-
<PAGE>

    16.2 Amendments to this Agreement are effective only if made in writing 
and executed by Buyer and Seller.

17. BROKER'S RIGHTS.

    17.1 If this sale shall not be consummated due to the default of Buyer, 
the Buyer shall not be liable to and shall not have to pay to Broker(s) the 
commission that Broker(s) would have received had the sale been consummated. 
This obligation of Buyer is not in addition to any obligation with respect to 
liquidated damages.

    17.2 Upon the Closing, Broker(s) is/are authorized to publicize the facts 
of this transaction.

18. NOTICES.

    18.1 Whenever any Party hereto, Escrow Holder or Broker(s) herein shall 
desire to give or serve any notice, demand, request, approval, or other 
communication, each such communication shall be in writing, and delivered 
personally by messenger or by mail, postage prepaid addressed as set forth 
adjacent to that partys' or Brokers' signature on this Agreement or by 
telecopy with receipt confirmed by telephone.  Service of any such 
communication shall be deemed made on the date of actual receipt at such 
address.

    18.2 Any Party or Broker hereto may from time to time by notice in 
writing served upon the other Party as aforesaid designate a different 
address to which or a different person or additional persons to whom all 
communications are thereafter to be made.

19. DURATION OF OFFER. 

    19.1 If this offer shall not be accepted by Seller on or before 5:00 P.M. 
according to the time standard applicable to the city of Pleasanton, on the 
date of December 18, 1996, it shall be deemed automatically revoked.

    19.2 The acceptance of this offer or of any subsequent counter-offer 
hereto that creates an agreement between the Parties as described in 
Paragraph 1.2 shall be deemed made upon delivery to the other Party or either 
Broker herein of a duly executed writing unconditionally accepting the last 
outstanding offer or counter-offer.

20. LIQUIDATED DAMAGES.  (THIS LIQUIDATED DAMAGES PARAGRAPH IS APPLICABLE 
ONLY IF INITIALED BY BOTH PARTIES).

    20.1 THE PARTIES AGREE THAT IT WOULD BE IMPRACTICABLE OR EXTREMELY 
DIFFICULT TO FIX, PRIOR TO SIGNING THIS AGREEMENT, THE ACTUAL DAMAGES WHICH 
WOULD BE SUFFERED BY SELLER IF BUYER FAILS TO PERFORM ITS OBLIGATIONS UNDER 
THIS AGREEMENT.  THEREFORE, IF, AFTER THE SATISFACTION OR WAIVER OF ALL 
CONTINGENCIES PROVIDED FOR THE BUYER'S BENEFIT, BUYER BREACHES THIS 
AGREEMENT, SELLER SHALL BE ENTITLED TO LIQUIDATED DAMAGES IN THE AMOUNT OF 
$25,000 PLUS INTEREST, IF ANY, ACCRUED THEREON.  UPON PAYMENT OF SAID SUM TO 
SELLER, BUYER SHALL BE RELEASED FROM ANY FURTHER LIABILITY TO SELLER, AND ANY 
ESCROW CANCELLATION FEES AND TITLE COMPANY CHARGES SHALL BE PAID BY SELLER.

    Buyer Initials                               Seller Initials


                                        -12-

<PAGE>

21. ARBITRATION OF DISPUTES.  THIS ARBITRATION OF DISPUTES PARAGRAPH IS 
APPLICABLE ONLY IF INITIALED BY BOTH PARTIES AND IS SUBJECT TO PARAGRAPH 22 
BELOW).

    21.1 ANY CONTROVERSY AS TO WHETHER SELLER IS ENTITLED TO THE LIQUIDATED 
DAMAGES AND/OR BUYER IS ENTITLED TO THE RETURN OF DEPOSIT MONEY, SHALL BE 
DETERMINED BY BINDING ARBITRATION BY, AND UNDER THE COMMERCIAL RULES (the 
"COMMERCIAL RULES") OF, THE AMERICAN ARBITRATION ASSOCIATION.  HEARINGS ON 
SUCH ARBITRATION SHALL BE HELD IN THE COUNTY WHERE THE PROPERTY IS LOCATED.  
ANY SUCH CONTROVERSY SHALL BE ARBITRATED BY THREE (3) ARBITRATORS WHO SHALL 
BE IMPARTIAL REAL ESTATE BROKERS WITH AT LEAST FIVE (5) FULL TIME YEARS OF 
EXPERIENCE IN THE AREA WHERE THE PROPERTY IS LOCATED, IN THE TYPE OF REAL 
ESTATE THAT IS THE SUBJECT OF THIS AGREEMENT AND SHALL BE APPOINTED UNDER THE 
COMMERCIAL RULES. THE ARBITRATORS SHALL HEAR AND DETERMINE SAID CONTROVERSY 
IN ACCORDANCE WITH APPLICABLE LAW AND THE INTENTION OF THE PARTIES AS 
EXPRESSED IN THIS AGREEMENT, AS THE SAME MAY HAVE BEEN DULY MODIFIED IN 
WRITING BY THE PARTIES PRIOR TO THE ARBITRATION, UPON THE EVIDENCE PRODUCED 
AT AN ARBITRATION HEARING SCHEDULED AT THE REQUEST OF EITHER PARTY.  SUCH 
PRE-ARBITRATION DISCOVERY SHALL BE PERMITTED AS IS AUTHORIZED UNDER THE 
COMMERCIAL RULES OR STATE LAW APPLICABLE TO ARBITRATION PROCEEDINGS.  THE 
AWARD SHALL BE EXECUTED BY AT LEAST TWO (2) OF THE THREE (3) ARBITRATORS, BE 
RENDERED WITHIN THIRTY (30) DAYS AFTER THE CONCLUSION OF THE HEARING, AND MAY 
INCLUDE ATTORNEYS' FEES AND COSTS TO THE PREVAILING PARTY PER PARAGRAPH 15 
HEREOF.  JUDGMENT MAY BE ENTERED ON THE AWARD IN ANY COURT OF COMPETENT 
JURISDICTION NOTWITHSTANDING THE FAILURE OF A PARTY DULY NOTIFIED OF THE 
ARBITRATION HEARING TO APPEAR THEREAT.

    21.2 BUYER'S RESORT TO OR PARTICIPATION IN SUCH ARBITRATION PROCEEDINGS 
SHALL NOT BAR SUIT IN A COURT OF COMPETENT JURISDICTION BY THE BUYER FOR 
DAMAGES AND/OR SPECIFIC PERFORMANCE UNLESS AND UNTIL THE ARBITRATION RESULTS 
IN AN AWARD TO THE SELLER OF LIQUIDATION DAMAGES, IN WHICH EVENT SUCH AWARD 
SHALL ACT AS A BAR AGAINST ANY ACTION BY BUYER FOR DAMAGES AND/OR SPECIFIC 
PERFORMANCE.

    21.3 NOTICE BY INITIALING IN THE SPACE BELOW YOU ARE AGREEING TO HAVE ANY 
DISPUTE ARISING OUT OF THE MATTERS INCLUDED IN THE "ARBITRATION OF DISPUTES" 
PROVISION DECIDED BY NEUTRAL ARBITRATION AS PROVIDED BY CALIFORNIA LAW AND 
YOU ARE GIVING UP ANY RIGHTS YOU MIGHT POSSESS TO HAVE THE DISPUTE LITIGATED 
IN A COURT OR JURY TRIAL.  BY INITIALING IN THE SPACE BELOW YOU ARE GIVING UP 
YOUR JUDICIAL RIGHTS TO DISCOVERY AND APPEAL, UNLESS SUCH RIGHTS ARE 
SPECIFICALLY INCLUDED IN THE "ARBITRATION OF DISPUTES" PROVISION.  IF YOU 
REFUSE TO SUBMIT TO ARBITRATION AFTER AGREEING TO THIS PROVISION, YOU MAY BE 
COMPELLED TO ARBITRATE UNDER THE AUTHORITY OF THE CALIFORNIA CODE OF CIVIL 
PROCEDURE.  YOUR AGREEMENT TO THIS ARBITRATION PROVISION IS VOLUNTARY.  WE 
HAVE READ AND UNDERSTAND THE FOREGOING AND AGREE TO SUBMIT DISPUTES ARISING 
OUT OF THE MATTERS INCLUDED IN THE "ARBITRATION OF DISPUTES" PROVISION TO 
NEUTRAL ARBITRATION.

    Buyer Initials                               Seller Initials


                                        -13-

<PAGE>

22. APPLICABLE LAW.

    22.1 This Agreement shall be governed by, and Paragraph 21.3 amended to 
refer to, the laws of the state in which the Property is located.    

23. TIME OF ESSENCE.

    23.1 Time is of the essence of this Agreement.

24. COUNTERPARTS.

    24.1 This Agreement may be executed by Buyer and Seller in counterparts, 
each of which shall be deemed an original, and all of which together shall 
constitute one and the same instrument.  Escrow Holder, after verifying that 
the counterparts are identical except for the signatures, is authorized and 
instructed to combine the signed signature pages on one of the counterparts, 
which shall then constitute the Agreement.

25. DISCLOSURES REGARDING THE NATURE OF A REAL ESTATE AGENCY RELATIONSHIP.

    25.1 The Parties and Broker(s) agree that their relationship(s) shall be 
governed by the principles set forth in California Civil Code, Section 2375, 
as summarked in the following Paragraph 25.2.

    25.2 When entering into a discussion with a real estate agent regarding a 
real estate transaction, a Buyer or Seller should from the outset understand 
what type of agency relationship or representation it has with the agent or 
agents in the transaction.  Buyer and Seller acknowledge being advised by the 
Broker(s) in this transaction, as follows:

           (a)  SELLER'S AGENT.  A Seller's agent under a listing agreement 
with the Seller acts as the agent for the Seller only.  A Seller's agent or 
subagent has the following affirmative obligations: (1) TO THE SELLER: A 
fiduciary duty of utmost care, integrity, honesty, and loyalty in dealings 
with the Seller. (2) TO THE BUYER AND THE SELLER: (a) Diligent exercise of 
reasonable skill and care in performance of the agent's duties, (b) A duty of 
honest and fair dealing and good faith, (c) A duty to disclose all facts 
known to the agent materially affecting the value or desirability of the 
property that are not known to, or within the diligent attention and 
observation of, the Parties.  An agent is not obligated to reveal to either 
Party any confidential information obtained from the other Party which does 
not involve the affirmative duties set forth above.

         (b)  BUYER'S AGENT.  A selling agent can, with a Buyer's consent, 
agree to act as agent for the Buyer only.  In these situations, the agent is 
not the Seller's agent, even if by agreement the agent may receive 
compensation for services rendered, either in full or in part from the 
Seller.  An agent acting only for a Buyer has the following affirmative 
obligations. (1) TO THE BUYER: A fiduciary duty of utmost care, integrity, 
honesty, and loyalty in dealings with the Buyer. (2) TO THE BUYER AND THE 
SELLER: (a) Diligent exercise of reasonable skill and care in performance of 
the agent's duties, (b) A duty of honest and fair dealing and good faith (c) 
A duty to disclose all facts known to the agent materially affecting the 
value or desirability of the property that are not known to, or within the 
diligent attention and observation of, the Parties.  An agent is not 
obligated to reveal to either Party any confidential information obtained 
from the other Party which does not involve the affirmative duties set forth 
above.

         (c)  AGENT REPRESENTING BOTH SELLER AND BUYER.  A real estate agent, 
either acting directly or through one or more associate licenses, can legally 
be the agent of both the Seller and the Buyer in a transaction, but only with 
the knowledge and consent of both the Seller and the Buyer. (1) in a dual 
agency situation, the agent has the following affirmative obligations to both 
the Seller and the Buyer: (a) A fiduciary duty of utmost care, integrity, 

                                        -14-
<PAGE>

honesty and loyalty in the dealings with either Seller or the Buyer, (b) 
Other duties to the Seller and the Buyer as stated above in their respective 
sections (a) or (b) of this paragraph 25.2 (2).  In representing both Seller 
and Buyer, the agent may not without the express permission of the respective 
Party, disclose to the other Party that the Seller will accept a price less 
than the listing price or that the Buyer will pay a price greater than the 
price offered.  (3) The above duties of the agent in a real estate 
transaction do not relieve a Seller or Buyer from the responsibility to 
protect their own interests.  Buyer and Seller should carefully read all 
agreements to assure that they adequately express their understanding of the 
transaction.  A real estate agent is a person qualified to advise about real 
estate.  If legal or tax advice is desired, consult a competent professional.

         (d)  FURTHER DISCLOSURES.  Throughout this transaction Buyer and 
Seller may receive more than one disclosure, depending upon the number of 
agents assisting in the transaction.  Buyer and Seller should each read its 
contents each time it is presented, considering the relationship between them 
and the real estate agent in this transaction and that disclosure.

    25.3 CONFIDENTIAL INFORMATION.  Buyer and Seller agree to identify to 
Broker(s) as "Confidential" any communication or information given Broker(s) 
that is considered by such Party to be confidential.

26. ADDITIONAL PROVISIONS:

    Additional provisions of this offer, if any, are as follows or are 
attached hereto by an addendum consisting of paragraphs "A" through "K".  (It 
will be presumed no other provisions are included unless specified here.) 
Addendums "A" and Exhibit "A" and "B" are attached hereby made a part of this 
Lease.
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

BUYER AND SELLER HEREBY ACKNOWLEDGED THAT THEY HAVE BEEN AND ARE NOW BY THE 
BROKER(S) TO CONSULT AND RETAIN THEIR OWN EXPERTS TO ADVISE AND REPRESENT 
THEM CONCERNING THE LEGAL AND INCOME TAX EFFECTS OF THIS AGREEMENT, AS WELL 
AS THE CONDITION AND/OR LEGALITY OF THE PROPERTY, THE IMPROVEMENTS, AND 
EQUIPMENT THEREIN, THE SOIL THEREOF, THE CONDITION OF TITLE THERETO, THE 
SURVEY THEREOF, THE ENVIRONMENTAL ASPECTS THEREOF, THE EXISTENCE AND NATURE 
OF TENANCIES THEREIN, THE OUTSTANDING OTHER AGREEMENTS, IF ANY, WITH RESPECT 
THERETO, AND THE EXISTING OR CONTEMPLATED FINANCING THEREOF, AND THAT THE 
BROKER(S) IS/ARE NOT TO BE RESPONSIBLE FOR PURSUING THE INVESTIGATION OF ANY 
SUCH MATTERS UNLESS EXPRESSLY OTHERWISE AGREED TO IN WRITING BY BROKER(S) AND 
BUYER OR SELLER.

              THIS FORM IS NOT FOR USE IN CONNECTION WITH
              THE SALE OF  RESIDENTIAL PROPERTY.

If this Agreement has been filled in, it has been prepared for submission to 
your attorney for his approval.  No representation of recommendation is made 
by the real estate Broker(s) or their agents or employees as to the legal 

                                        -15-

<PAGE>

sufficiency, legal effect, or tax consequences of this Agreement or the 
transaction involved herein.  The undersigned Buyer offers and agrees to buy 
the Property on the terms and conditions stated and acknowledges receipt of a 
copy hereof.

BROKER:                           BUYER:  Supergen, Inc.

By:      Lee & Associates C.R.E.S.               By:  /s/ Hank Settle
   -----------------------------------------        ---------------------------
Date:                                            By:
     ---------------------------------------        ---------------------------
Name Printed:      Bob Kumnick                   Name Printed:  Hank Settle
             -------------------------------                  -----------------
Title:   Principal                               Title: Chief Financial Officer
      --------------------------------------           ------------------------
Address: 5960 Stoneridge Drive, Suite 101        Address: 6450 Hollis Street
        ------------------------------------             ----------------------
         Pleasanton, CA 94588                             Emeryville, CA 94608
        ------------------------------------             ----------------------
Telephone:    (510) 460-6200                      Telephone:  (510) 655-1075
          ----------------------------------                -------------------
Telecopier:   (510) 460-6210                      Telecopier: (510) 655-1098
          ----------------------------------                 ------------------

27. ACCEPTANCE.

    27.1 Seller accepts the foregoing offer to purchase the Property and hereby 
agrees to sell the Property to Buyer on the terms and conditions therein 
specified.

    27.2 Seller acknowledges that Broker(s) has/have been retained to locate a 
Buyer and is/are the procuring cause of the purchase and sale of the Property 
set forth in this Agreement. In consideration of real estate brokerage service 
rendered by Broker(s), Seller agrees to pay Broker(s) a real estate brokerage 
fee in a sum equal to six percent of the Purchase Price (the Broker(s) Fee) 
divided equally in such shares as said Broker(s) shall direct in writing, As 
us provided in paragraph 9.1(o), this Agreement shall serve as an irrevocable 
instruction to Escrow Holder to pay such brokerage fee to Broker(s) out of the 
proceeds accruing to the account of Seller at the Closing.

    27.3 Seller acknowledges receipt of a copy hereof and authorizes the 
Broker(s) to deliver a signed copy to Buyer.

                                        -16-

<PAGE>


NOTE:  A PROPERTY INFORMATION SHEET IS REQUIRED TO BE DELIVERED TO BUYER BY 
SELLER UNDER THIS AGREEMENT.
<TABLE>

<S>                                            <C>
BROKER:                                        SELLER:

By:   Lee & Associates C.R.E.S.                By:  The Ashwill Trust, established 11/8/89
   ------------------------------                 ---------------------------------
Date:                                          Date:   12-23-96
     ----------------------------                   -------------------------------
Name Printed:      Bob Kumnick                 Name Printed:  Ellwin E. Ashwill  /s/ Ellwin E. Ashwill
             --------------------                           ------------------------------------------
Title:   Principal                             Title:    Trustee
      ---------------------------                    ------------------------------
Address: 5960 Stoneridge Drive, Suite 101      Address: 725 Town & Country, Suite 140
        ----------------------------------            --------------------------------
          Pleasanton, CA 94588                           Orange, CA 92868
        ----------------------------------            --------------------------------
Telephone:    (510) 460-6200                   Telephone:     (510) 564-1632
          --------------------------------               -----------------------------
Telecopier:   (510) 469-6210                   Telecopier:    (510) 564-0505
          --------------------------------               -----------------------------

</TABLE>
                                        -17-

<PAGE>
                            ADDENDUM "A"


This Addendum is hereby made a part of the Standard Offer, Agreement, and 
Escrow Instructions for Purchase of Real Estate, dated December 11, 1996, by 
and between THE ASHWILL TRUST, ESTABLISHED NOVEMBER 8, 1989 ("Seller") and 
SUPERGEN, INC. ("Buyer"), for the Premises located at 1059 Serpentine Lane, 
Pleasanton, California.

    A.   Lessee to purchase the shell building (9,600 -plus or minus- sq. 
         ft.) at 1059 Serpentine Lane, at SEVEN HUNDRED FORTY-FOUR 
         THOUSAND AND NO/100 DOLLARS ($744,000.00) and close 
         escrow upon approval of the Building Final Inspection of 
         shell building from the City of Pleasanton.  Buyer will 
         be responsible for loan costs and title company costs as 
         outlined below:

         1.   Current non-delinquent city and country real estate taxes, and
              principal and interest on assessments shall be prorated between
              Buyer and Seller as of the close of escrow on the basis of a
              thirty (30) day month.

              Note:  Bonds and assessments of public record in the
              approximating total amount of ELEVEN THOUSAND SIX HUNDRED SIXTEEN
              ($11,616.00) as of October, 1996, which are a lien on the
              Property shall be assumed by Buyer.  The exact amount of
              assessments will be calculated by the City of Pleasanton at close
              of escrow and prorated accordingly.

         2.   Buyer agrees to pay for all escrow fees, recording fees, notary
              fees, and owner's and lender's title insurance policies.  Seller
              agrees to pay for the county transfer tax.  All other costs and
              expenses, if any, shall be borne by the respective parties in
              accordance with the custom in Alameda County prevailing at the
              Close of Escrow for similar transactions.

    B.   Deposits

         1.   TEN THOUSAND AND NO/100 DOLLARS ($10,000.00) to be deposited in
              escrow within five (5) days after mutual execution of Purchase
              and Sale Agreement.  Said deposit shall be placed by Escrow
              Company into an interest bearing account reasonably acceptable to
              both Buyer and Seller, with all interest accruing for the benefit
              of Buyer.

         2.   Buyer shall have forty-five (45) calendar days from the Opening
              of Escrow (the "Inspection Feasibility Period") within which to: 
              (i) inspect any and all physical aspects of the Property,
              (ii) review existing zoning and other governmental regulations,
              (iii) review all title exceptions, and (iv) inspect and test
              soils, groundwater, and hazardous materials, if any.

              Buyer shall also have sixty (60) calendar days from the Opening
              of Escrow (the "Financing Contingency Period") to secure adequate
              financing.  Prior to the expiration of each Contingency Period,
              Buyer shall have the right to terminate the Purchase Agreement by
              delivering written notice of such election to Seller.  If Buyer
              elects not to proceed with the purchase of this property, Escrow
              Company shall return deposit to the Buyer.

              Seller further agrees to furnish Buyer with any and all existing
              soils, engineering, geologic and environmental studies completed
              by Seller to date on the Property, or adjacent properties, within
              ten (10) business days of the Opening of Escrow.

<PAGE>


         3.   A FIFTEEN THOUSAND AND NO/100 DOLLARS ($15,000.00) additional
              deposit to be entered into escrow upon removal or waiver of all
              contract contingencies (60 days from date of agreement).  At such
              time, all deposits to date (TWENTY-FIVE THOUSAND AND NO/100
              DOLLARS ($25,000)) will be released to the Seller and be
              applicable to the purchase price, but non-refundable to Buyer
              subject to Sellers receiving approval of Building Final
              Inspection from the City of Pleasanton on the shell building. 
              Said approval shall be in substantial conformity with plans of
              record approved by Buyer and Seller.  Any items specified may be
              substituted with equal quality replacement or better.

    C.   Building Shell Defined

         The building proposed to be delivered in shell condition consisting of
         a single story, concrete tilt-up condominium building of approximately
         9,600 square feet.

         The common area ownership consists of approximately 
         60,460 square feet of buildings on 167,793 -plus or 
         minus- square feet of land. The condominium building 
         located at 1059 Serpentine Lane shall be 15.9 percent of 
         the total, as outlined in Exhibit "B" of the Covenants, 
         Conditions & Restrictions of Serpentine Business Park.  
         The buildings in the project have an average building to 
         land coverage of thirty-six percent (36%).  A minimum of 
         ten (10) designated asphalt paved parking spaces for this 
         building will be provided with appropriate striping, 
         subject to the City of Pleasanton approval.  The balance 
         of the parking will be shared in common with the other 
         building owners.  The total project will have a parking 
         ratio of approximately 2.83 parking spaces per 1,000 -plus 
         or minus- square feet of building.  Only address signage on 
         buildings will be provided.  The landscaping plan is 
         defined in the building plans.  A separate irrigation 
         water meter common to the whole project is part of a 
         fully automatic, zoned, landscaping irrigation system. 
         The project has an appropriate storm drainage system and 
         screened refuse areas.  All off-site work and utility 
         connections, as defined below, shall be the 
         responsibility of the Builder.

         The appropriate utilities, which include provision for electrical
         meter and private water meter, shall be stubbed out and capped on the
         exterior of the building by the Builder.  Telephone to be stubbed to
         the building.  The natural gas line shall be stubbed to the east
         exterior of the building located at 1059 Serpentine Lane.  The sewer
         line will be plumbed in the concrete floor of the building.  The
         electrical service will be 800 AMP, 120/208 volt, 3-phase power to the
         westerly exterior of the building.  The 800 AMP panel will not include
         a meter socket, nor a breaker.  However, a 100 AMP house panel will be
         supplied including a socket, meter and breaker.

         The building exterior will be painted, landscaped, have an interior
         fire sprinkler system.  No electrical power distribution will be
         provided within the building.  The interior warehouse walls will be
         painted.  There will be no insulation in the building.

         The building shall be weather tight, and have skylights, doors, and
         windows, as per building plans.


                                        -2-
<PAGE>

    D.   Close of Escrow

         The building shell will be completed by mid to late February 1997.

         Close of escrow shall be within three (3) days of Seller's receipt of
         approved Building Final Inspection from the City of Pleasanton of the
         shell building (estimated to be March 1, 1997).  If Buyer chooses to
         extend escrow after shell is complete, then Buyer will be obligated to
         pay Seller ONE HUNDRED SIXTY-THREE AND NO/100 DOLLARS ($163.00) per
         day until escrow closes.

         Buyer may commence building tenant improvements subject to the
         following:

         1.   All contingencies are removed.

         2.   Deposits (TWENTY-FIVE THOUSAND AND NO/100 DOLLARS ($25,000.00))
              are passed through to Seller.

         3.   Buyer has approved building permit for tenant improvements from
              the City of Pleasanton.

    E.   Buyer to read and approve CC&R's of Valley Business Park and
         Serpentine Business Park, by-laws, association financial information,
         preliminary title report, and any other information regarding property
         delivered by Seller within forty-five (45) calendar days of date of
         Agreement.

    F.   Seller herein has a valid California Real Estate Broker's license.

    G.   Disclosure:

         -    Seller herein is selling a building shell, located at 1059
              Serpentine Lane, City of Pleasanton;

         -    Buyer hereby acknowledges that any and all representation
              regarding square footage of unit is approximate, and pertains to
              industry standards.  For the purpose(s) of common area
              maintenance expense(s), pro rata and market comparables, the
              measurement to the BUILDING'S DRIP LINE has been used;

         -    Units are being sold on a total price for the unit, not a per
              square foot price.

    H.   Assignment Rights:  Buyer has the right to assign any rights to
         acquire the Property to an entity in which Buyer is principal.

    I.   Seller's Studies:  As soon as possible following the execution by
         Seller hereof, Seller shall deliver to Buyer copies of all information
         in Seller's possession relating to the Property to assist Buyer in its
         feasibility study.

    J.   It is the intent of the Ashwill Trust, Established November 8, 1989,
         to effect a tax deferred exchange in accordance with Section 1031 of
         the Internal Revenue Code.  Buyer agrees to cooperate fully for
         Seller's exchange and is to be at no additional expense or liability
         for same.

                                        -3-

<PAGE>


    K.   Seller represents and warrants that the building shell shall be
         designed and constructed in a workmanlike manner, consistent with the
         building plans approved by Buyer, and that they should be fit for the
         purposes for which they are intended.

All exceptions to the foregoing representations and warranties are listed below
(if there are no exceptions, write "No Exceptions".)

The building plans for the project and this Standard Offer, Agreement and 
Escrow Instructions are intended to supplement each other so that any work 
mentioned in one (1) instrument but not in the other shall be performed in 
the same manner as if mentioned in both instruments.  If there is a conflict 
or difference between the two (2) instruments, then the Standard Offer, 
Agreement and Escrow Instructions shall prevail over the building plans.  
Parking approved by the City of Pleasanton, shall be accepted by all parties 
as the final approval.

UNDERSTOOD AND AGREED:

SELLER:                           BUYER:

THE ASHWILL TRUST,                SUPERGEN, INC.
ESTABLISHED NOVEMBER 8, 1989

BY: /s/ Ellwin E. Ashwill         BY:  /s/ Hank Settle
   -----------------------------     -----------------------------
      Ellwin E. Ashwill, Trustee           Hank Settle
DATE: 12-23-96                    DATE: December 19, 1996
    ----------------------------      ----------------------------

                                        -4-

<PAGE>

                            ADDENDUM "B"


This Addendum is hereby made a part of the Standard Offer, Agreement, and 
Escrow Instructions for Purchase of Real Estate, dated December 11, 1996, by 
and between THE ASHWILL TRUST, ESTABLISHED NOVEMBER 8, 1989 ("Seller") and 
SUPERGEN, INC. ("Buyer"), for the Premises located at 1059 Serpentine Lane, 
Pleasanton, California.

                      800 AMP Electrical Power
                      ------------------------

    It has been requested by Supergen, Inc. that Lessor install an 800 amp 
electrical service in lieu of a 400 AMP service to the westerly exterior of 
said building.  This has been requested by Supergen, Inc. prior to their due 
diligence and before they have removed any of the contingencies, outlined in 
the Standard Offer, Agreement and Escrow Instructions for Purchase of Real 
Estate, dated December 11, 1996.  If Supergen, Inc. does not proceed and go 
forward with the purchase of said building, Seller will be left with an 
increased electrical service he does not want.  Accordingly, Buyer hereby 
agrees to the following:

    1.   Seller shall install an 800 AMP service in lieu of a 400 AMP service 
to the westerly exterior of said building.  The 800 AMP service shall not 
include a meter socket, nor any breaker.  Seller shall include a 100 AMP 
house service, breaker and meter socket; said 100 AMPs to be part of the 800 
AMPs.

    2.   Buyer to release THREE THOUSAND AND NO/100 DOLLARS ($3,000.00) of 
his deposit monies immediately to Seller in payment of difference in power 
installation, applicable against the Purchase Price, but not refundable to 
Buyer in the event Buyer cancels escrow for any reason whatsoever.

    3.   It is understood and part of the agreement that should Buyer cancel, 
he automatically forfeits the Three Thousand and No/100 Dollars ($3,000.00) 
portion of Buyer's deposit released to Seller.

UNDERSTOOD AND AGREED:

SELLER:                           BUYER:

THE ASHWILL TRUST,                SUPERGEN, INC.
ESTABLISHED NOVEMBER 8, 1989

BY:  /s/ Ellwin E. Ashwill        BY:  /s/ Hank Settle
   ------------------------------    --------------------------------------
    Ellwin E. Ashwill, Trustee              Hank Settle

DATE:  12-23-96                   DATE: Dec. 19, 1996
    -----------------------------      ------------------------------------

<PAGE>
                     PROPERTY INFORMATION SHEET
                          (Non-Residential)

          LEE & ASSOCIATES COMMERCIAL REAL ESTATE SERVICES

TO WHOM IT MAY CONCERN:

The Ashwill Trust ("Owner"), owns the property commonly known by the street
address of 1059 Serpentine Lane, located in the City of Pleasanton, County of
Alameda, State of California, and generally described as (describe briefly the
nature of the  property):
                         -------------------------------------------------------
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
("Property"), and certifies that:

    1. MATERIAL PHYSICAL DEFECTS.  Owner has no actual knowledge of any
material physical defects in the Property or any improvements and structures
thereon, including, but not limited to the roof, except (it will be assumed no
known exceptions exist unless they are specified here):
                                                       -----------------------
- ------------------------------------------------------------------------------
- ------------------------------------------------------------------------------
- -----------------------------------------------------------------------------.

    2. EQUIPMENT.  Owner has no actual knowledge that the heating, ventilating,
air conditioning, plumbing, loading doors, electrical and lighting systems, life
safety systems and mechanical equipment existing on the Property as of the date
hereof, if any are not in good operating order and condition, except (it will be
assumed no known exceptions exist unless they are specified here):
                                                                  --------------
- --------------------------------------------------------------------------------
- -------------------------------------------------------------------------------.

    3. SOIL CONDITIONS.  Owner has no actual knowledge that the Property has
any slipping, sliding, settling, flooding, ponding, or any other grading,
drainage or soil problems, except (it will be assumed no known exceptions exist
unless they are specified here):                                    
                               ------------------------------------------------
- -------------------------------------------------------------------------------
- ------------------------------------------------------------------------------.

    4. SEWER.  Owner represents and warrants that the Property is served by a 
(check appropriate box /x/ public sewer system or /  / private septic 
system, and that, if the Property is served by a public sewer system, the 
cost of installation of such sewer system has been fully paid, except (it 
will be assumed no known exceptions exist unless they are specified here):    
- ------------------------------------------------------------------------------
- -----------------------------------------------------------------------------.

    5. EARTHQUAKE ZONE.  If the Property is located in the State of California,
Owner has no actual knowledge that the Property is located within a delineated
special studies zone (a zone that encompasses a potentially or recently active
trace of an earthquake fault that is deemed by the state geologist to be
sufficiently active and well defined enough to constitute a potential hazard to
structures from surface fault or fault creep) under an Alquist-Priolo Special
Studies Zone Map, except (it will be assumed that no known exceptions exist,
unless they are specified here):
                                -----------------------------------------------
- -------------------------------------------------------------------------------
- ------------------------------------------------------------------------------.

<PAGE>

    6. COMPLIANCE WITH LAWS.  Owner has no actual knowledge of any aspect or
condition of the Property which violates applicable laws, rules, regulations,
codes or covenants, conditions, or restrictions, or of improvements or
alterations made to the Property without a permit where one was required, or of
any unfulfilled order or directive of any applicable government agency or of any
casualty insurance company that any work of investigation, remediation, repair,
maintenance or improvement is to be performed on the Property, except (it will
be assumed no known exceptions exist unless they are specified here):
                                                                     ----------
- -------------------------------------------------------------------------------
- ------------------------------------------------------------------------------.

    7. HAZARDOUS SUBSTANCES.  Owner has no actual knowledge of the current 
existence on the Property of asbestos, PCB  transformers or any hazardous, 
toxic, or infectious substance whose nature and/or quantity of existence, use, 
manufacture, or effect, render it subject to Federal, state, or local 
regulation, investigation, remediation or removal as potentially injurious to 
public health or welfare, except (it will be assumed no known exceptions exist 
unless they are specified here):
                                -----------------------------------------------
- -------------------------------------------------------------------------------
- ------------------------------------------------------------------------------.

    8. STORAGE TANKS.  Owner has no actual knowledge of the past or present
existence of any above or below ground storage tank or tanks on the Property,
except (it will be assumed no known exceptions exist unless they are specified
here):
      -------------------------------------------------------------------------
- -------------------------------------------------------------------------------
- ------------------------------------------------------------------------------.

    9. ACTION, SUITS OR PROCEEDINGS.  Owner has no actual knowledge that any
actions, suits or proceedings are pending or threatened before any court,
arbitration tribunal, governmental department, commission, board, bureau,
agency, or instrumentality that would affect the Property or the right or
ability of an Owner or Tenant to convey, occupy, or utilize the Property, except
(it will be assumed no known exceptions exist unless they are specified here):
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
- -------------------------------------------------------------------------------.

    10. GOVERNMENTAL PROCEEDINGS.  Owner has no actual knowledge of any
existing or contemplated condemnation, environmental, zoning, redevelopment
agency plan or any other land use regulation proceedings which could
detrimentally affect the value, use and operation of the Property, except (it
will be assumed no known exceptions exist unless they are specified here):
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
- ------------------------------------------------------------------------------.

    11. UNRECORDED TITLE MATTERS.  Owner has no actual knowledge of any
encumbrances, covenants, conditions, restriction, easements, licenses, liens,
charges or other matters which affect the title of the Property that are not
recorded in the official records of the county recorder where the Property is
located, except (it will be assumed no known exceptions exist unless they are
specified here):
                ---------------------------------------------------------------
- -------------------------------------------------------------------------------
- ------------------------------------------------------------------------------.
                                        -2-

<PAGE>

    12. LEASES.  Owner has no actual knowledge of any leases, subleases, or
other tenancy agreements affecting the Property, except (it will be assumed no
known exceptions exist unless they are specified here):
                                                       ------------------------
- -------------------------------------------------------------------------------
- ------------------------------------------------------------------------------.

    Owner's statements herein will be relied upon by brokers, buyers, lessees, 
lenders and others.  Therefore, Owner has reviewed and modified this printed 
statement as necessary to accurately and completely state all the known 
material facts concerning the Property.  To the extent such modifications are 
not made, this statement may be relied upon as printed.  This statement, 
however, shall not relieve a buyer or lessee of responsibility for independent 
investigation of the Property.  Owner agrees to promptly notify, in writing, 
all appropriate parties of any material changes which may occur in the 
statements contained herein from the date this statement is signed until title 
to the Property is transferred, by a recorded deed, by Owner.

                                            "OWNER"

Date: 12/23    1996                         The Ashwill Trust       
    --------------------------------        ----------------------------------
    (fill in date of execution)

                                             By:  /s/ Ellwin E. Ashwill
                                                ------------------------------
                                             Name Printed:  Ellwin E. Ashwill
                                             Title:  Trustee

                                             By:
                                                ------------------------------
                                             Name Printed:
                                                          --------------------
                                             Title:
                                                   ---------------------------
                                        -3-

<PAGE>

                       UNIFORM DISCLAIMER FORM
                              SALE FORM

1.  LEGAL EFFECT.  Upon acceptance of the Purchase Contract and Deposit
    Receipt, or any counteroffer thereto, Seller and Buyer both intend to have
    a binding legal agreement for the purchase of the Premises on the terms and
    conditions set forth therein.  Seller and Buyer acknowledge that Broker is
    not qualified to practice law, nor authorized to give legal advice or
    counsel you as to any legal matters affecting this document.  Broker hereby
    advises Seller and Buyer to consult with their respective attorneys in
    connection with any questions each may have as to legal ramifications or
    effects of this document, prior to its execution.

2.  FORM OF PURCHASE CONTRACT AND DEPOSIT RECEIPT.  The proposed document is a
    standard form document, and Broker makes no representations or warranties
    with respect to the adequacy of this document for either Seller's or
    Buyer's particular purposes.  Broker has, at the direction of Seller and/or
    Buyer, "filled in the blanks" from information provided to Broker based on
    prior correspondence, discussions of the parties with respect to the
    Purchase Contract and Deposit Receipt, and subsequent counteroffers between
    the parties hereto.  By initialing this Paragraph, Seller and Buyer
    acknowledge and agree that the Purchase Contract and Deposit Receipt is
    delivered to each subject to the express condition that Broker has merely
    followed the instructions of the parties in preparing this document, and
    does not assume any responsibility for its accuracy, completeness or form. 
    Seller and Buyer acknowledge and agree that in  providing this document,
    Broker has acted to expedite this transaction on behalf of Seller and
    Buyer, and has functioned within the scope of professional ethics by doing
    so.

              Seller's initials: /s/             Buyer's Initials: /s/
                                -----------                       -----------
3.  NO INDEPENDENT INVESTIGATION.  Seller and Buyer acknowledge and understand
    that any financial statements, information, reports, or written materials
    of any nature whatsoever, as provided by the parties to Broker, and
    thereafter submitted by Broker to either Seller and/or Buyer, are so
    provided without any independent investigation by Broker, and as such
    Broker assumes no responsibility or liability for the accuracy or validity
    of the same.  Any verification of such submitted documents is solely and
    completely the responsibility of the party to whom such documents have been
    submitted.

4.  NO WARRANTY.  Seller and Buyer acknowledge and agree that no warranties,
    recommendations, or representations are made by the broker as to the
    accuracy, the legal sufficiency, the legal effect of the tax consequences
    of any of the documents submitted by Broker to Seller and/or Buyer
    referenced in Paragraph 3 above, nor of the legal sufficiency, legal
    effect, or tax consequences of the transactions contemplated thereby.
    furthermore, Seller and Buyer acknowledge and agree that Broker has made no
    representations concerning the ability of the Buyer to use the Premises for
    their intended use, and Buyer is relying solely on its own investigation of
    the Premises in accepting the Purchase Contract and Deposit Receipt.

5.  NOTICE REGARDING HAZARDOUS WASTES OR SUBSTANCES AND UNDERGROUND STORAGE
    TANKS.  Although Broker will disclose any knowledge it actually possesses
    with respect to the existence of any hazardous wastes, substances, or
    underground storage tanks at the Premises, Broker has not made any
    independent investigations or obtained reports with respect thereto, except
    as may be described in a separate written document signed by Broker.  All
    parties hereto acknowledge and understand that Broker makes no
    representations regarding the existence or nonexistence of hazardous
    wastes, substances, or underground storage tanks at the Premises.  Each
    party should contact a professional, such as a civil engineer, geologist,
    industrial hygienist or other persons with experience in these matters to
    advise you concerning the property.

<PAGE>

6.  DISCLOSURE RESPECTING AMERICANS WITH DISABILITIES ACT.  The United States
    Congress has recently enacted the Americans With Disabilities Act.  Among
    other things, this act is intended to make many business establishments
    equally accessible to persons with a variety of disabilities; modifications
    to real property may be required.  State and local laws also may mandate
    changes.  Broker is not qualified to advise you as to what, if any, changes
    may be required now or in the future.  Broker recommends that you consult
    the attorneys and qualified design professionals of your choice for
    information regarding these matters.

7.  ATTORNEYS' FEES.  In any action, proceeding or arbitration arising out of
    this Agreement, the prevailing party shall be entitled to reasonable
    attorneys' fees and costs.

8.  ENTIRE AGREEMENT.  This document constitutes the entire agreement between
    parties with respect to the subject matter contained herein and supersedes
    all prior or contemporaneous agreements, representations, negotiations and
    understandings of the parties, other than such writings as may be executed
    and/or delivered by the parties pursuant hereto.  There are no oral
    agreements or implied covenants by the Seller or Buyer, or by their
    respective employees, or other representatives.


    Date:   12-23-96                        Date:  Dec. 19, 1996
         ---------------------------             --------------------------
    Seller: /s/ Ellwin E. Ashwill           Buyer: Hank Settle
          --------------------------             --------------------------
         Ellwin E. Ashwill,
         The Ashwill Trust


                                        -2-

<PAGE>

                                     Exhibit A

                                     SITE PLAN
                                  CONDOMINIUM PLAN
                                        FOR 
                                  PARCEL MAP 7030
                           CITY OF PLEASANTON CALIFORNIA





<PAGE>


                                     Exhibit B

                                    BUILDING "B"
                                   BUILDING PLAN

                                  CONDOMINIUM PLAN
                                        FOR
                                  PARCEL MAP 7030
                           CITY OF PLEASANTON CALIFORNIA


<PAGE>


Ashwill Trust
c/o Robert S. Kumnick
Lee & Associates
5960 Stoneridge Drive
Suite 101
Pleasanton, CA 94588

RE:   SUPERGEN, INC. - BUILDING PURCHASE
      1059 SERPENTINE LANE, PLEASANTON, CALIFORNIA

Dear Gene:

Per Addendum A of the Purchase Contract, this letter will serve as 
notification that all contract contingencies for financing (loan) have been 
approved and waived by SuperGen, Inc.




Approved:  /s/ Joseph Rubinfeld                                       2/21/97
         --------------------------------------------------------------------
               Joseph Rubinfeld, President / CEO                         Date

Approved:  /s/ Henry C. Settle, Jr.                          February 21, 1997
         ---------------------------------------------------------------------
          Henry C. Settle, Jr., Chief Financial Officer, SuperGen, Inc.   Date



<PAGE>
                                                              Exhibit 10.24


                           BISHOP RANCH BUSINESS PARK

                                 BUILDING LEASE


<PAGE>

                                 SUPERGEN, INC.
                     BISHOP RANCH BUSINESS PARK-BUILDING LEASE
                                TABLE OF CONTENTS

                                                                            PAGE
                                                                            ----
1.   PREMISES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

2.   TERM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
     2.1  Term . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
     2.2  Delay In Commencement. . . . . . . . . . . . . . . . . . . . . . . . 1
     2.3  Acknowledgment Of Commencement Date. . . . . . . . . . . . . . . . . 2

3.   RENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
     3.1  Base Rent. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
     3.2  Adjustments  To  Base  Rent. . . . . . . . . . . . . . . . . . . . . 2
     3.3  Amounts Constituting Rent. . . . . . . . . . . . . . . . . . . . . . 2

4.   SECURITY DEPOSIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

5.   TAX AND BUILDING OPERATING COST INCREASES . . . . . . . . . . . . . . . . 3
     5.1  Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
     5.2  Tenant's Share . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
     5.3  Notice and Payment . . . . . . . . . . . . . . . . . . . . . . . . . 5
     5.4  Tenant's Right to Audit. . . . . . . . . . . . . . . . . . . . . . . 6
     5.5  Additional Taxes . . . . . . . . . . . . . . . . . . . . . . . . . . 7
     5.6  Tenant's Taxes . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

6.   USE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
     6.1  Use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
     6.2  Suitability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
     6.3  Uses Prohibited. . . . . . . . . . . . . . . . . . . . . . . . . . . 8

7.   SERVICE AND UTILITIES . . . . . . . . . . . . . . . . . . . . . . . . . . 8
     7.1  Landlord's Obligations . . . . . . . . . . . . . . . . . . . . . . . 8
     7.2  Tenant's Obligation. . . . . . . . . . . . . . . . . . . . . . . . . 9
     7.3  Tenant's Additional Requirements . . . . . . . . . . . . . . . . . . 9
     7.4  After Hours Charges for Air Conditioning . . . . . . . . . . . . . .10
     7.5  Nonliability . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

8.   MAINTENANCE AND REPAIRS; ALTERATIONS AND ADDITIONS. . . . . . . . . . . .10
     8.1  Maintenance and Repairs. . . . . . . . . . . . . . . . . . . . . . .10
     8.2  Alterations and Additions. . . . . . . . . . . . . . . . . . . . . .11

9.   ENTRY BY LANDLORD . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

10.  LIENS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12


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                                TABLE OF CONTENTS
                                    (CONTINUED)
                                                                            PAGE
                                                                            ----
11.  INDEMNITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
     11.1 Indemnity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
     11.2 Exemption of Landlord From Liability . . . . . . . . . . . . . . . .13

12.  INSURANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
     12.1 Coverage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
     12.2 Insurance Policies . . . . . . . . . . . . . . . . . . . . . . . . .14
     12.3 Landlord's Insurance . . . . . . . . . . . . . . . . . . . . . . . .14
     12.4 Waiver of Subrogation. . . . . . . . . . . . . . . . . . . . . . . .14

13.  DAMAGE OR DESTRUCTION . . . . . . . . . . . . . . . . . . . . . . . . . .15
     13.1 Landlord's Duty to Repair. . . . . . . . . . . . . . . . . . . . . .15
     13.2 Landlord's Right to Terminate. . . . . . . . . . . . . . . . . . . .15
     13.3 Tenant's Right to Terminate. . . . . . . . . . . . . . . . . . . . .16
     13.4 Exclusive Rights . . . . . . . . . . . . . . . . . . . . . . . . . .16

14.  CONDEMNATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

15.  ASSIGNMENT AND SUBLETTING . . . . . . . . . . . . . . . . . . . . . . . .17
     15.1 Landlord's Consent Required. . . . . . . . . . . . . . . . . . . . .17
     15.2 Reasonable Consent . . . . . . . . . . . . . . . . . . . . . . . . .17
     15.3 Excess Consideration . . . . . . . . . . . . . . . . . . . . . . . .17
     15.4 No Release Of Tenant . . . . . . . . . . . . . . . . . . . . . . . .18
     15.5 Attorneys' Fees. . . . . . . . . . . . . . . . . . . . . . . . . . .18
     15.6 Transfer Of Ownership Interest . . . . . . . . . . . . . . . . . . .18
     15.7 Effectiveness of Transfer. . . . . . . . . . . . . . . . . . . . . .18
     15.8 Landlord's Right to Space. . . . . . . . . . . . . . . . . . . . . .18
     15.9 No Net Profits Leases. . . . . . . . . . . . . . . . . . . . . . . .18
     15.10 Permitted Assignment or Sublease. . . . . . . . . . . . . . . . . .19

16.  SUBORDINATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
     16.1 Subordination. . . . . . . . . . . . . . . . . . . . . . . . . . . .19
     16.2 Junior Liens . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
     16.3 Subordination Agreements . . . . . . . . . . . . . . . . . . . . . .19
     16.4 Attornment . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

17.  OUIET ENJOYMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20



                                    -ii-
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                                TABLE OF CONTENTS
                                   (CONTINUED)
                                                                            PAGE
                                                                            ----
18.  DEFAULT; REMEDIES . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
     18.1 Default. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
     18.2 Remedies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
     18.4 Interest . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
     18.5 Default By Landlord. . . . . . . . . . . . . . . . . . . . . . . . .23

19.  PARKING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

20.  RELOCATION OF PREMISES. . . . . . . . . . . . . . . . . . . . . . . . . .24
     20.1 Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
     20.2 Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

21.  MORTGAGEE PROTECTION. . . . . . . . . . . . . . . . . . . . . . . . . . .24

22.  ESTOPPEL CERTIFICATES . . . . . . . . . . . . . . . . . . . . . . . . . .25

23.  SURRENDER. HOLDING OVER . . . . . . . . . . . . . . . . . . . . . . . . .25
     23.1 Surrender. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
     23.2 Holding Over . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

24.  HAZARDOUS MATERIALS . . . . . . . . . . . . . . . . . . . . . . . . . . .26

25.  MISCELLANEOUS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
     25.1 Attornment . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
     25.2 Cautions: Attachments; Defined Terms . . . . . . . . . . . . . . . .27
     25.3 Entire Agreement . . . . . . . . . . . . . . . . . . . . . . . . . .27
     25.4 Severability . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
     25.5 Costs Of Suit. . . . . . . . . . . . . . . . . . . . . . . . . . . .28
     25.6 Time; Joint And Several Liability. . . . . . . . . . . . . . . . . .28
     25.7 Binding Effect; Choice Of Law. . . . . . . . . . . . . . . . . . . .28
     25.8 Waiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
     25.9 Force Majeure. . . . . . . . . . . . . . . . . . . . . . . . . . . .29
     25.10 Landlord's Liability. . . . . . . . . . . . . . . . . . . . . . . .29
     25.11 Consents and Approvals. . . . . . . . . . . . . . . . . . . . . . .29
     25.12 Signs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
     25.13 Rules And Regulations . . . . . . . . . . . . . . . . . . . . . . .30
     25.14 Notices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30



                                     -iii-

<PAGE>


                                TABLE OF CONTENTS
                                   (CONTINUED)
                                                                            PAGE
                                                                            ----
     25.15 Authority . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
     25.16 Lease Guaranty. . . . . . . . . . . . . . . . . . . . . . . . . . .31
     25.17 Brokers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
     25.18 Reserved Rights . . . . . . . . . . . . . . . . . . . . . . . . . .31
     25.19 Option to Extend. . . . . . . . . . . . . . . . . . . . . . . . . .31


     EXHIBIT A - Site and Floor Plans
     EXHIBIT B - Work Letter
     EXHIBIT C - Space Plan
     EXHIBIT D - Rules and Regulations
     EXHIBIT E - Janitorial Specifications
     EXHIBIT F - Door Sign, Directory Strip and Mail Box Request
     EXHBIIT G - Commencement of Lease



                                      -iv-

<PAGE>




                           BISHOP RANCH BUSINESS PARK

                                 BUILDING LEASE


     This Lease is made and entered into this ________ day of 
_______________, 1996, by and between ANNABEL INVESTMENT COMPANY, a 
California partnership, (hereinafter "Landlord") and SUPERGEN, INC.  
(hereinafter "Tenant").  For and in consideration of the rental and of the 
covenants and agreements hereinafter set forth to be kept and performed by 
Tenant, Landlord hereby leases to Tenant and Tenant hereby leases from 
Landlord the premises herein described for the term, at the rental and 
subject to and upon all of the terms, covenants and agreements hereinafter 
set forth.

     1.   PREMISES

          Landlord hereby leases to Tenant and Tenant hereby leases from
Landlord the premises (the "Premises") crosshatched on Exhibit A containing
9,247 rentable square feet known as Suite 220, located on the Second floor of
Two Annabel Lane, Building B (including all tenant improvements thereto, the
"Building"), located at San Ramon, California 94583.  The Building is part of a
Complex containing the Building and one (1) other building (the "Complex").  The
Complex, which contains 95,432 rentable square feet, the land on which the
Complex is situated (the "Land"), the common areas of the Complex, any other
improvements in the Complex and the personal property used by Landlord in the
operation of the Complex (the "Personal Property") are herein collectively
called the "Project." Landlord shall pay the cost of "Suite Improvements" (as
such term is defined in the work letter attached hereto as Exhibit B, "the "Work
Letter") to the Premises up to a maximum amount of SEVENTY-EIGHT THOUSAND EIGHT
HUNDRED EIGHTY-FIVE AND NO/100 DOLLARS ($78,885.00 or $9.00 per usable square
foot of the Premises), with any cost in excess of this amount to be paid by
Tenant promptly as incurred.  In the event Tenant does not use the entire
allowance for improving the Premises, any remainder may be taken in the form of
a Rental Credit.

    2.    TERM

          2.1  TERM.  The term of this Lease shall commence on the "Commencement
Date" hereinafter defined to be the earlier of the date Landlord delivers
possession of the Premises to Tenant with all of the Suite Improvements
Substantially Completed, as defined in Exhibit B, or the date Landlord would
have completed the Premises and tendered the Premises to Tenant if Substantial
Completion had not been delayed by the number of days specified in any and all
Tenant Delay Notices given by Landlord as described in Exhibit B.  The term of
this Lease shall end Five (5) years thereafter (the "Expiration Date"), unless
sooner terminated pursuant to this Lease.

          2.2  DELAY IN COMMENCEMENT.  The Commencement Date is scheduled to
occur on January 15, 1997 (the "Scheduled Commencement Date"), but if there are
"Scheduled Commencement Adjustment Days" (referred to in Section 25.9 of this
Lease and Exhibit B), then the Scheduled Commencement Date shall be that Date
which is the same number of days after 



<PAGE>

January 15, 1997 as the sum of the Scheduled Commencement Adjustment Days.  
If for any reason the Commencement Date does not occur by the Scheduled 
Commencement Date, Landlord shall not be liable for any damage thereby nor 
shall such inability affect the validity of this Lease or the obligations of 
Tenant hereunder.  If the Commencement Date has not occurred within sixty 
(60) days after the Scheduled Commencement Date, Tenant at its option, to be 
exercised by giving Landlord written notice within thirty (30) days after the 
end of such sixty (60) day period, may terminate this Lease and, upon 
Landlord's return of any monies previously deposited by Tenant, which shall 
be returned within thirty (30) days after receipt of Tenant's written notice, 
the parties shall have no further rights or liabilities toward each other.

          2.3  ACKNOWLEDGMENT OF COMMENCEMENT DATE.  Upon determination of the
Commencement Date, Landlord and Tenant shall execute a written acknowledgment of
the Commencement Date and Expiration Date in the form attached hereto as Exhibit
G.

     3.   RENT

          3.1  BASE RENT.  Tenant shall pay to Landlord monthly as base rent
("Base Rent") for the Premises in advance on the Commencement Date and on the
first day of each calendar month thereafter during the term of this Lease
without deduction, offset, prior notice or demand, in lawful money of the United
States of America, the sum of FIFTEEN THOUSAND FOUR HUNDRED ELEVEN AND 67/100
DOLLARS ($15,411.67). If the Commencement Date is not the first day of a month
or if the Lease terminates on other than the last day of a month, the Base Rent
payable for such partial month shall be equal to the number of days that the
term was in effect during such partial month TIMES the "daily Base Rent," which
shall be calculated by dividing the Base Rent then in effect by thirty (30).

          Concurrently with Tenant's execution of this Lease, Tenant shall pay
to Landlord the sum of FIFTEEN THOUSAND FOUR HUNDRED ELEVEN AND 67/100 DOLLARS
($15,411.67) to be applied against Base Rent when it becomes due.

          3.2  ADJUSTMENTS  TO  BASE  RENT.  (Intentionally Deleted)

          3.3  AMOUNTS CONSTITUTING RENT.  All amounts payable or reimbursable
by Tenant under this Lease, including late charges and interest, "Operating Cost
Payments" (as defined in Paragraph 5), and amounts payable or reimbursable under
the Work Letter and the other Exhibits hereto, shall constitute "Rent" and be
payable and recoverable as such.  Base Rent is due and payable as provided in
Paragraph 3.1 - "Base Rent", Operating Cost Payments are due and payable as
provided in Paragraph 5.3 - "Notice and Payment", and all other Rent payable to
Landlord on demand under the terms of this Lease, unless otherwise set forth
herein, shall be payable within thirty (30) days after written notice from
Landlord of the amounts due.  All Rent shall be paid to Landlord without
deduction or offset, except as otherwise set forth herein, in lawful money of
the United States of America at the address for notices or at such other place
as Landlord may from time to time designate in writing.


                                    -2-

<PAGE>

     4.   SECURITY DEPOSIT

          Concurrently with Tenant's execution of this Lease, Tenant shall 
deposit with Landlord the sum of FIFTEEN THOUSAND FOUR HUNDRED ELEVEN AND 
67/100 DOLLARS ($15,411.67) (the "Security Deposit").  In the event Tenant 
installs a Lab in the Premises, the Security Deposit shall be THIRTY THOUSAND 
EIGHT HUNDRED TWENTY-THREE AND 33/100 DOLLARS ($30,823.33).  The Security 
Deposit shall be held by Landlord as security for the faithful performance by 
Tenant of all of the terms, covenants and conditions of this Lease to be 
performed by Tenant during the term hereof.  If Tenant defaults with respect 
to any provision of this Lease, including the provisions relating to the 
payment of any Rent, Landlord may (but shall not be required to) use, apply 
or retain all or any part of the Security Deposit to cure such default or to 
compensate Landlord for any other loss or damage which Landlord may suffer by 
reason of Tenant's default.  If any portion of said deposit is so used or 
applied, Tenant shall, within ten (10) days after written demand therefor, 
deposit cash with Landlord in an amount sufficient to restore the Security 
Deposit to its original amount; Tenant's failure to do so shall be a material 
breach of this Lease. Landlord shall not be required to keep the Security 
Deposit separate from its general funds, and Tenant shall not be entitled to 
interest on such deposit.  If Tenant shall fully and faithfully perform every 
provision of this Lease to be performed by it, the Security Deposit or any 
balance thereof shall be returned to Tenant (or, at Landlord's option, to the 
last assignee of Tenant's interest hereunder) within thirty (30) days after 
the expiration of the Lease term and Tenant's vacating the Premises; 
provided, however, that Landlord may elect, in its discretion, to retain a 
portion of the Security Deposit in an amount to be determined by Landlord in 
its reasonable judgment and Landlord shall, promptly upon determining the 
increases in Operating Costs for the calendar year in which this Lease 
terminates, pursuant to Paragraph 5.3 -"Notice and Payment," apply from such 
retained portion of the Security Deposit any sums underpaid by Tenant with 
respect to Operating Costs for the final year of the Lease term, and return 
the balance, if any, to Tenant or its assignee.  In the event of termination 
of Landlord's interest in this Lease, Landlord shall transfer the Security 
Deposit to Landlord's successor in interest whereupon Landlord shall be 
released from liability for the return of the Security Deposit or the 
accounting therefor provided that such transferee assumes Landlord's 
liability for the return of the Security Deposit or the accounting therefore 
in writing.

    5.   TAX AND BUILDING OPERATING COST INCREASES

         5.1   DEFINITIONS.  For purposes of this paragraph, the following 
terms are herein defined:

               (a)  BASE YEAR:  The calendar year in which this Lease commences.

               (b)  OPERATING COSTS:  Operating Costs shall include all costs
and expenses of ownership, operation, repair and maintenance of the Project
(excluding depreciation of the improvements in the Project and all amounts paid
on loans of Landlord) computed in accordance with Tax Basis accounting
principles adopted by Landlord consistently applied, including by way of
illustration but not limited to: real property taxes, taxes assessed on the
Personal Property, any other governmental impositions imposed on or by reason of
the ownership, operation or use of the Project, 


                                    -3-

<PAGE>

and any tax in addition to or in lieu thereof, other than taxes covered by 
Paragraph 5.4, whether assessed against Landlord or Tenant or collected by 
Landlord or both; parts; equipment; supplies; insurance premiums; license, 
permit and inspection fees; cost of services and materials (including 
property management fees and costs); cost of compensation (including 
employment taxes and fringe benefits) of all persons who perform duties 
connected with the operation, maintenance and repair of the Project; costs of 
providing utilities and services, including water, gas, electricity, sewage 
disposal, rubbish removal, janitorial, gardening, security, parking, window 
washing, supplies and materials, and signing (but excluding services not 
uniformly available to substantially all of the Project tenants); costs of 
capital improvements (i) required to cause the Project to comply with all 
laws, statutes, ordinances, regulations, rules and requirements of any 
governmental or public authority, including, without limitation, the 
Americans with Disabilities Act of 1990 (the "ADA") (collectively, "Legal 
Requirements"), except for costs, if any, of correcting any failure of the 
Project to comply, as of the Commencement Date, with any Legal Requirement as 
enacted as of the Commencement Date, or (ii) which reduce Operating Costs, 
such costs, together with interest on the unamortized balance at the rate of 
ten percent (10%) per annum, to be amortized over such reasonable periods as 
Landlord shall determine; costs of maintenance and replacement of 
landscaping; legal, accounting and other professional services incurred in 
connection with the operation of the Project and the calculation of Operating 
Costs; and rental expense or a reasonable allowance for depreciation of 
personal property used in the maintenance, operation and repair of the 
Project.  If the Project is not fully occupied for any calendar year during 
the term of this Lease, Operating Costs shall be adjusted to the amount 
which would have been incurred if the Project had been fully occupied for 
the year.  (Tax Basis Accounting Principles are defined to be the Internal 
Revenue Code and related rules, regulations, rulings, and applicable case law 
applied by Landlord on a consistent basis in reporting income and expense, 
including the capitalization of costs and related depreciation, to the 
Internal Revenue Service.)

               (c)  Notwithstanding the foregoing, annual Operating Costs shall
not include the following:

                    (1)  Capital improvements, equipment, replacements,
alterations and repairs, except as Landlord reasonably determines are
attributable to services performed for the Complex;

                    (2)  Construction and installation of tenant improvements,
renovations, or decorating made for tenants or other occupants in the Complex or
for vacant tenant suites within the Building, including, without limitation,
fees and costs for space planning, architectural drawings, construction,
permits, licenses and inspections.

                    (3)  Negotiations and transactions with present or
prospective tenants or other occupants of the Complex for leases, subleases,
assignments and other related transactions, including, without limitation,
attorneys' fees for such negotiations and transactions;

                    (4)  Interest, principal, points and fees on debts or
amortization on any mortgage or any other debt instrument encumbering the
Building;


                                    -4-

<PAGE>

                    (5)  All items and services for which Tenant or any other
tenant in the Complex directly reimburses Landlord (other than through tenant's
share of Operating Expenses), or which Landlord provides selectively to one or
more tenants (other than Tenant) without reimbursement;

                    (6)  Marketing costs, including leasing commissions,
advertising and promotional expenditures, and costs of signs in or on the
Complex identifying the owner of the Complex or other tenants' signs; and

                    (7)  Upgrading the Complex to comply with handicap, life
safety, fire and safety codes to the extent the same were in effect prior to the
Commencement Date;

                    (8)  Legal fees and expenses incurred in connection with the
enforcement of any leases, disputes or defense of Landlord's title to or
interest in the Project, audits, or other litigation related to the Project.

          5.2  TENANT'S SHARE.  If Operating Costs during any calendar year
following the Base Year exceed the rentable square footage of the Building
multiplied by $8.00 (the "Expense Stop"), Tenant shall pay to Landlord "Tenant's
Share" multiplied by such excess ("Operating Cost Payments").  "Tenant's Share"
means 9.69%, which is calculated by dividing the rentable square footage of the
Premises by the rentable square footage of the Complex, as such rentable square
footages are set forth in Paragraph 1.

          5.3  NOTICE AND PAYMENT.  As soon as reasonably practical after the
end of each calendar year following the Base Year, Landlord shall furnish Tenant
a written statement showing in reasonable detail the Operating Costs for the
preceding calendar year, and the amount of any payment due from Tenant to
Landlord or from Landlord to Tenant, taking into account prior Operating Cost
Payments made by Tenant for such preceding calendar year.  Tenant shall have one
hundred eighty (180) days after receipt of Landlord's statement to notify
Landlord of any objections they have to such statement, or of their intention to
review supporting documentation for such statement.  If Tenant does not so
notify Landlord, such statement shall conclusively be deemed correct and Tenant
shall have no right thereafter to dispute or review support for such statement,
any item therein, or the computation of Operating Costs.  If Tenant does so
notify the Landlord within the one hundred eighty (180) day period, Tenant shall
have one (1) year from the date of receipt of Landlord's statement to complete
their review of the supporting documentation and notify Landlord of all
objections, if any, to such statement.  Landlord and Tenant hereby agree that
Tenant will submit in writing to Landlord on or before the end of said one (1)
year period, all objections to Landlord's statement, and Tenant's only rights
after said one (1) year period shall be nonreversible removals or reductions of
the said objections submitted to Landlord.  Landlord and Tenant hereby agree
that after said one (1) year period, Tenant has no further rights to review any
supporting documentation to Landlord's statement. Any notifications to Landlord
will be done in accordance with Paragraph 25.14.

          Coincidentally with the monthly Base Rent next due following Tenant's
receipt of such statement, Tenant shall pay to Landlord (in the case of an
underpayment) or Landlord shall credit 


                                    -5-

<PAGE>

against the next Base Rent due from Tenant (in the case of an overpayment) 
the difference between (i) Tenant's Share of any excess of Operating Costs 
for the preceding calendar year over the Expense Stop (the "Prior Year's 
Increase"), and (ii) the Operating Cost Payments made by Tenant for such 
preceding calendar year.  In addition, Tenant shall pay to Landlord 
coincidentally with such next due Base Rent an amount equal to (A) 
one-twelfth (1/12) of the Prior Year's Increase, if any, multiplied by (B) 
the number of months or partial months (including the then current month) 
then elapsed in the current calendar year, less (C) the aggregate of any 
Operating Cost Payments made by Tenant for such current calendar year.  
Monthly thereafter until adjustment is made the following year pursuant to 
this paragraph, Tenant shall pay together with the monthly Base Rent 
one-twelfth (1/12) of any such Prior Year's Increase.  In no event will 
Tenant be entitled to receive the benefit of a reduction in Operating Costs 
below the Expense Stop.

          For any partial calendar year at the termination of this Lease,
Tenant's Share of any increases in Operating Costs for such year over the
Expense Stop shall be prorated on the basis of a 365-day year by computing
Tenant's Share of the increases in Operating Costs for the entire year and then
prorating such amount for the number of days this Lease was in effect during
such year. Notwithstanding the termination of this Lease, and within ten (10)
days after Tenant's receipt of Landlord's statement regarding the determination
of increases in Operating Costs for the calendar year in which this Lease
terminates, Tenant shall pay to Landlord or Landlord shall pay to Tenant, as the
case may be, an amount equal to the difference between Tenant's Share of the
increases in Operating Costs for such year (as prorated) and the amount
previously paid by Tenant toward such increases.

          5.4  TENANT'S RIGHT TO AUDIT.  In the event of any dispute or
uncertainty as to the amount of Operating Costs and Tenant's Share thereof,
Tenant may require clarification as to any disputed amount, including without
limitation, receiving and reviewing legible copies of all of Landlord's invoices
and paid receipts, with respect to the disputed items, and pursuing an audit as
hereinafter specified, provided Tenant notifies Landlord in writing within one
hundred eighty (180) days of its receipt of Landlord's statement that Tenant
elects to inspect and/or audit such records pursuant to this Paragraph.  Should
Tenant elect to inspect and/or audit such records, Tenant's inspection and/or
audit shall be conducted by Tenant's staff or by an independent certified Big
Six public accounting firm and shall be completed and the results thereof
submitted to Landlord no later than six (6) months after Tenant's receipt of
Landlord's statement.  If Landlord and Tenant are unable to agree as to any
disputed item, Tenant may, at its sole cost and expense, audit on its own
Landlord's records related to the disputed items, which audit shall be scheduled
promptly at the reasonable convenience of both Landlord and Tenant with such
audit to take place in Landlord's offices.  If the results of such audit by an
independent Big 6 public accounting firm approved by Landlord, whose approval
shall not be unreasonably withheld, and Tenant indicate that the aggregate cost
of the disputed items is incorrect by more than 5%, then the Landlord shall
refund the discrepancy.  If the amount of the discrepancy is more than five
percent (5%) of the Total Operating Costs, then Landlord shall pay for the
reasonable cost of the Big 6 public accounting firm audit, (not to exceed
$2,500.00).


                                    -6-

<PAGE>

          5.5  ADDITIONAL TAXES.  Tenant shall reimburse to Landlord, within
thirty (30) days after receipt of a demand therefor, Tenant's Share of any and
all taxes payable by Landlord (other than net income taxes or any taxes included
within Operating Costs), whether or not now customary or within the
contemplation of the parties hereto (i) upon, allocable to or measured by the
area of the Building, (ii) upon all or any portion of the Rent payable hereunder
and under other leases of space in the Building, including any gross receipts
tax or excise tax levied with respect to the receipt of such Rent, or (iii) upon
or with respect to the possession, leasing, operation, management, maintenance,
alteration, repair, use or occupancy of the Building or any portion thereof. 
Tenant shall not be required to reimburse Landlord for taxes under this
Paragraph 5.4 to the extent Tenant has paid Tenant's Share of such taxes through
Operating Cost Payments under Paragraph 5.2.

          5.6  TENANT'S TAXES.  Tenant shall pay before delinquency (whether 
levied on Landlord or Tenant), any and all taxes assessed upon or measured by 
(i) Tenant's equipment, furniture, fixtures and other personal property 
located in the Premises, (ii) any improvements or alterations made to the 
Premises prior to or during the term of this Lease paid for by Tenant 
("Above-Standard Improvements"), or (iii) this transaction or any document to 
which Tenant is a party creating or transferring an interest or an estate in 
the Premises.  For the purpose of determining said amounts, figures supplied 
by the County Assessor as to the amount so assessed shall be conclusive.  
Tenant shall comply with the provisions of any law, ordinance or rule of the 
taxing authorities which require Tenant to file a report of Tenant's property 
located in the Premises.

     6.   USE

          6.1  USE.  The Premises shall be used and occupied by Tenant for
general offices and administrative purposes and with Landlord's written consent,
research and development which may include the installation of a laboratory. 
In the event Tenant receives Landlord's written consent to utilize a portion of
its Premises for research and development and laboratory use, said use shall
adhere to and conform with stipulations as set forth in Section 24 of this
Lease.  It is further agreed and understood that in the event Tenant installs a
laboratory in a portion of its Premises, Tenant shall at all times follow all
National Institute of Health (NIH) and Center for Disease Control (CDC)
guidelines (the "Guidelines") in their present form and as they may be amended
for handling etiologic or infections agents.  Further, Tenant agrees that it
shall not bring, or allow to be brought, into the Building any etiologic or
infectious agents for which the NIH or CDC recommend a Biosafety Level (BL) in
excess of two (2) (BL2). Tenant shall design, construct and maintain all of its
laboratory facilities and support areas in the Building to conform with and
satisfy the Guidelines for BLl and BL2 laboratory facilities, as the case may
be, depending on the kinds of agents which will be brought into the respective
laboratories.  If the Guidelines are amended, Tenant shall modify its facilities
accordingly.  In addition, Tenant shall adopt and follow all procedures,
practices and techniques prescribed in the Guidelines for the BLl and BL2 work
as the case may be.

          6.2  SUITABILITY.  Tenant acknowledges that neither Landlord nor any
agent of Landlord has made any representation or warranty with respect to the
Premises or the Building or with respect to the suitability of either for the
conduct of Tenant's business, nor has Landlord agreed to undertake any
modification, alteration or improvement to the Premises except as provided in
the 


                                    -7-

<PAGE>

Work Letter.  The taking of possession of the Premises by Tenant shall 
conclusively establish that the Premises and the Building were at such time 
in satisfactory condition except for any latent defects, unless within ten 
(10) days after such date Tenant shall give Landlord written notice 
specifying in reasonable detail the respects in which the Premises or the 
Building were not in satisfactory condition.

          6.3  USES PROHIBITED.

               (a)  Tenant shall not do nor permit anything to be done in or
about the Premises nor bring or keep anything therein which will in any way
increase the existing rate (unless Tenant agrees to pay for such increase) or
affect any fire or other insurance upon the Building or any of its contents, or
cause a cancellation of any insurance policy covering said Building or any part
thereof or any of its contents, nor shall Tenant sell or permit to be kept, used
or sold in or about said Premises any articles which may be prohibited by a
standard form policy of fire insurance.

               (b)  Tenant shall not do or permit anything to be done in or
about the Premises which will in any way obstruct or interfere with the rights
of other tenants or occupants of the Building, or injure or annoy them, or use
or allow the Premises to be used for any unlawful or objectionable purpose, nor
shall Tenant cause, maintain or permit any nuisance in or about the Premises.
Tenant shall not commit or suffer to be committed any waste in or upon the
Premises.  Tenant shall not bring onto the Premises any apparatus, equipment or
supplies that may overload the Premises or the Building or any utility or
elevator systems or jeopardize the structural integrity of the Building or any
part thereof.

               (c)  Tenant shall not use the Premises or permit anything to be
done in or about the Premises which will in any way conflict with, and at its
sole cost and expense shall promptly comply with, any Legal Requirement now in
force or which may hereafter be enacted or promulgated relating to the
condition, use or occupancy of the Premises, excluding structural changes not
relating to or affecting the condition, use or occupancy of the Premises or
Tenant's improvements or acts.  The judgment of any court of competent
jurisdiction or the admission of Tenant in any action against Tenant, whether
Landlord be a party thereto or not, that Tenant has violated any Legal
Requirement, shall be conclusive of the fact as between Landlord and Tenant.

     7.   SERVICE AND UTILITIES

          7.1  LANDLORD'S OBLIGATIONS.  Provided Tenant is not in default
hereunder, Landlord shall furnish to the Premises during reasonable hours of
generally recognized business days, to be determined by Landlord, and subject to
the rules and regulations of the Building, water, gas and electricity
("Utilities") suitable for the intended use of the Premises, heat and air
conditioning required in Landlord's reasonable judgment for the comfortable use
and occupancy of the Premises, scavenger, janitorial services as described in
Exhibit E attached hereto, window washing service and elevator service customary
in similar buildings in the competing geographical areas.  Landlord shall also
maintain and keep lighted the common lobbies, hallways, stairs and toilet rooms
in the Building.  Landlord's current hours of operation in Bishop Ranch II
(hereinafter "Hours of Operation") are 7 a.m. to 7 p.m., Monday through Friday,
excepting New Year's Day, President's Day, Memorial Day, 



                                    -8-

<PAGE>

July 4th, Labor Day, Thanksgiving, and Christmas Day.  The building and its 
Utilities are available to Tenant 24 hours a day, seven (7) days a week, 365 
days a year.

          7.2  TENANT'S OBLIGATION.  Tenant shall pay for, prior to delinquency,
all telephone and all other materials and services, not expressly required to be
paid by Landlord, which may be furnished to or used in, on or about the Premises
during the term of this Lease.

          7.3  TENANT'S ADDITIONAL REQUIREMENTS.

               (a)  Tenant shall pay for heat and air conditioning furnished 
at Tenant's request during non-business hours and/or on non-business days on 
an hourly basis at a reasonable rate established by Landlord not to exceed 
Landlord's actual, cost and a reasonable fee for wear and tear and supervision 
thereof.  Tenant shall not use in excess of Building Standard amounts (as 
reasonably determined by Landlord) of electricity, water or any other utility 
without Landlord's prior written consent, which consent Landlord may not 
unreasonably refuse.  Landlord may cause a water meter or electric current 
meter to be installed in the Premises so as to measure the amount of water 
and electric current consumed in excess of Building Standard amounts for any 
such excess use.  The cost of such meters and of installation, maintenance 
and repair thereof shall be paid by Tenant and Tenant agrees to pay Landlord 
promptly upon demand by Landlord for all such water and electric current 
consumed as shown by said meters, at the rates charged for such services by 
the city in which the Building is located or by the local public utility 
furnishing the same, plus any additional expense incurred in keeping account 
of the water and electric current so consumed.  If a separate meter is not 
installed to measure any such excess use, Landlord shall have the right to 
estimate the amount of such use through qualified personnel.  In addition, 
Landlord may impose a reasonable charge for the use of any additional or 
unusual janitorial services required by Tenant because of any Suite 
Improvements different from or above Building Standard, carelessness of 
Tenant or the nature of Tenant's business (including hours of operation). 
Notwithstanding the foregoing, Landlord agrees that at the time Tenant
provides Landlord with its approved construction drawings pursuant to Section
1.2 of Exhibit B attached hereto, Landlord shall notify Tenant in writing if
Tenant's initial Suite Improvements shall cause Tenant to use in excess of
building standard amounts of electricity, water, or any other utility.  If
Landlord determines that Tenant's initial installation shall be in excess of
building standard amounts, Landlord and Tenant shall agree to submeter Tenant's
Premises.

               (b)  If any lights other than Building Standard or equipment 
are used in the Premises which affect the temperature otherwise maintained by 
the air conditioning system, Landlord may install supplementary air 
conditioning units in the Premises and the reasonable cost thereof, including 
the cost of installation, operation and maintenance thereof, shall be paid by 
Tenant to Landlord upon demand by Landlord.

               (c)  In no event shall Tenant (i) connect any apparatus, machine
or device through electrical outlets except in the manner for which such outlets
are designed and without the use of any device intended to increase the plug
capacity of any electrical outlet or (ii) maintain at any 


                                    -9-

<PAGE>

time an electrical demand load in excess of four (4) watts per square foot of 
usable area of the Premises.

          7.4  AFTERHOURS CHARGES FOR AIR CONDITIONING.  The hourly rate for 
afterhours air conditioning service (as defined in Section 7.1) is $25.00 per 
hour per floor.  This rate shall be subject to adjustment based upon the 
increase or decrease in utilities costs as charged by PG&E.

          7.5  NONLIABILITY. Landlord shall not be liable for, and Tenant 
shall not be entitled to any abatement or reduction of Rent, by reason of 
Landlord's failure to furnish any of the foregoing when due to "Force Majeure 
Events" (as defined in Paragraph 25.9).  If failure to furnish the foregoing 
is within Landlord's reasonable control and Tenant is unable to occupy the 
Premises due to such failure, Tenant shall be entitled to an abatement of 
Base Rent commencing with the seventh (7TH) consecutive day of such failure 
unless prior thereto Landlord commences to cure such failure and thereafter 
diligently proceeds with such cure.  Any failure to furnish any of the 
foregoing shall not constitute an eviction of Tenant, constructive or 
otherwise and, notwithstanding any law to the contrary that may now or 
hereafter exist, Tenant shall not be entitled to terminate this Lease on 
account of such failure.  Landlord shall not be liable under any 
circumstances for loss of or injury to property or business or consequential 
damages, however occurring, through or in connection with failure to furnish 
any of the foregoing.

     8.   MAINTENANCE AND REPAIRS; ALTERATIONS AND ADDITIONS

          8.1  MAINTENANCE AND REPAIRS.

               (a)  LANDLORD'S OBLIGATIONS.  Landlord shall maintain in good
order, condition and repair the structural and common areas of the Building, and
the basic heating, ventilating, air conditioning, electrical, plumbing, fire
protection, life safety, security and mechanical systems of the Building (the
"Building Systems"), and the telephone cabling and wiring in and to the
Premises, and shall cause the common areas of the Building to comply with all
Legal Requirements (including, without limitation, the ADA), provided that any
maintenance and repair caused by the negligent acts or omissions of Tenant or
Tenant's agents, employees, invitees, visitors (collectively "Tenant's
Representatives") shall be paid for by Tenant.  Notwithstanding any law to the
contrary that may now or hereafter exist, Tenant shall not have the right to
make repairs at Landlord's expense or to terminate this Lease because of
Landlord's failure to keep the foregoing in good order, condition and repair,
nor shall Landlord be liable under any circumstances for any consequential
damages or loss of business, however occurring, through or in connection with
any such failure.  Notwithstanding the provisions of this Section, in the event
Landlord fails or neglects to commence the repairs to the Building or the
Premises which Landlord is required to make in accordance with the terms of this
Lease within thirty (30) days after receipt of written notice from Tenant of the
necessity therefore, and appropriate notice from Tenant, then Tenant may, but
shall not be obligated to, make such repairs using union subcontractors approved
by Landlord and providing Landlord with the cost estimate to complete said
repair, then Landlord shall reimburse Tenant for the reasonable cost thereof
within thirty (30) days after receipt of a bill therefor and copies of
applicable invoices with interest at the Default Rate.



                                    -10-

<PAGE>

               (b)  TENANT'S OBLIGATIONS

                    (1)  Tenant, at Tenant's sole cost and expense, except for
services furnished by Landlord pursuant to Paragraph 7 and 8.1(a) hereof, shall
maintain the Premises in good order, condition and repair including the interior
surfaces of the ceilings, walls and floors, all doors, interior windows, and all
plumbing pipes, electrical wiring, switches, fixtures, nonbuilding standard
lights, and equipment installed for the use of the Premises, and shall cause the
Premises to comply with all Legal Requirements enacted after the Commencement
Date (including, without limitation, the ADA).  Notwithstanding any law to the
contrary that may  now or hereafter exist, Tenant shall not have the right to
make repairs at Landlord's expense or to terminate this Lease because of
Landlord's failure to keep the Premises in good order, condition and repair.

                    (2)  In the event Tenant fails to maintain the Premises in
good order, condition and repair, Landlord shall give Tenant notice to do such
acts as are reasonably required to  so maintain the Premises.  In the event
Tenant fails to promptly commence such work and diligently prosecute it to
completion, Landlord shall have the right to do such acts and expend such funds
at the expense of Tenant as are reasonably required to perform such work.  Any
amount so expended by Landlord shall be paid by Tenant promptly after demand
with interest from the date expended by Landlord until paid by Tenant at the
"Default Rate," as defined below.  Landlord shall have no liability to Tenant
for any damage, inconvenience or interference with the use of the Premises by
Tenant as a result of performing any such work.  As used in this Lease, "Default
Rate" shall mean the lesser of twelve percent per annum(12%) or the maximum rate
permitted by law.

               (c)  COMPLIANCE WITH LAW.  Landlord and Tenant shall each do all
acts required to comply with all applicable Legal Requirements relating to their
respective maintenance and repair obligations as set forth herein.

          8.2  ALTERATIONS AND ADDITIONS.

               (a)  Tenant shall make no alterations, additions or improvements
to the Premises or any part thereof without obtaining the prior written consent
of Landlord.

               (b)  Landlord may impose as a condition to the aforesaid consent
such requirements as Landlord may deem necessary in its reasonable discretion,
including without limitation thereto, performing the work itself, specifying the
manner in which the work is done, and selecting the contractor by whom the work
is to be performed and the times during which it is to be accomplished.  Tenant
shall pay to Landlord upon demand an amount equal to the reasonable costs and
expenses for time spent by Landlord's employees or contractors in supervising,
approving and administering such alterations.


                                    -11-

<PAGE>

               (c)  All such alterations, additions or improvements, all other
Above-Standard Improvements, and all work performed under the Work Letter shall
be the property of Landlord and shall remain upon and be surrendered with the
Premises or shall be removed by Tenant at the expiration or termination of this
Lease.  At the time Landlord consents to any alteration or addition subsequent
to the Commencement Date, Landlord shall specify in writing to Tenant whether
the same shall be surrendered with the Premises, or whether at Landlord's
request shall be removed by Tenant.

               (d)  All articles of personal property and all business and trade
fixtures, machinery and equipment, cabinetwork, furniture and movable partitions
owned by Tenant or installed by Tenant at its expense in the Premises shall be
and remain the property of Tenant and may be removed by Tenant at any time
during the Lease term when Tenant is not in default hereunder.

     9.   ENTRY BY LANDLORD

          Landlord and Landlord's agents shall upon reasonable notice and 
consistent with Tenant's security requirements (except in the case of an 
emergency) have the right to enter the Premises to inspect the same, to 
supply janitorial service and any other service to be provided by Landlord to 
Tenant hereunder, to show the Premises to prospective purchasers or during 
the last one hundred eighty (180) days of the Lease Term or extended Term to 
prospective tenants, to post notices of non-responsibility and "for lease" 
signs, and to alter, improve or repair the Premises and any portion of the 
Building, and may for that purpose erect scaffolding and other necessary 
structures where reasonably required by the character of the work to be 
performed, always providing the entrance to the Premises shall not be blocked 
thereby.  Landlord shall use commercially reasonable efforts to conduct its 
activities under this Paragraph 9 in a manner that will minimize 
inconvenience to Tenant without incurring additional expense to Landlord. For 
each of the aforesaid purposes, Landlord shall at all times have and retain a 
key with which to unlock all of the doors in, upon and about the Premises, 
excluding Tenant's vaults and safes, and Landlord and Landlord's agents shall 
have the right to use any and all means which Landlord may deem proper to 
open said doors in an emergency, in order to obtain entry to the Premises, 
and any entry to the Premises obtained by Landlord or Landlord's agents by a 
said means, or otherwise, shall not under any circumstance be construed or 
deemed to be a forcible or unlawful entry into, or a detainer of, the 
Premises, or an eviction of Tenant from the Premises or any portion thereof. 
Tenant shall not be released from its obligations under this Lease nor be 
entitled to any abatement of Rent on account of Landlord's entry under this 
Paragraph, and Tenant hereby waives any claim for damages for any injury or 
inconvenience to or interference with Tenant's business, any loss of 
occupancy or quiet enjoyment of the Premises, and any other loss occasioned 
thereby.

     10.  LIENS

     Tenant shall keep the Premises and the Building free from any liens arising
out of work performed, materials furnished, or obligations incurred by Tenant
and shall indemnify, hold harmless and defend Landlord from any liens and
encumbrances arising out of any work performed, materials furnished or
obligations incurred by or at the direction of Tenant, excepting the initial
Tenant 


                                    -12-

<PAGE>

improvement work as shown on the attached Exhibit C performed by Landlord's 
contractor or subcontractors.  In the event that Tenant shall not, within 
twenty (20) days following the imposition of any such lien, cause such lien 
to be released of record by payment or posting of a proper bond, Landlord 
shall have, in addition to all other remedies provided herein and by law, the 
right, but no obligation, to cause the same to be released by such means as 
it shall deem proper, including payment of the claim giving rise to such 
lien.  All such sums paid by Landlord and all expenses incurred by it in 
connection therewith, including attorneys' fees and costs, shall be payable 
to Landlord by Tenant on demand with interest at the Default Rate until paid. 
Landlord shall have the right at all times to post and keep posted on the 
Premises any notices permitted or required by law, or which Landlord shall 
deem proper, for the protection of Landlord and the Premises, and any other 
party having an interest therein, from mechanics' and materialmen's liens, 
and Tenant shall give to Landlord at least three (3) business days prior 
written notice of the expected date of commencement of any work relating to 
alterations or additions to the Premises.  

     11.  INDEMNITY

          11.1 INDEMNITY.  Tenant agrees to indemnify Landlord against and save
Landlord harmless from any and all loss, cost, penalties, fines and reasonable
attorneys' fees and disbursements arising from (i) any default or breach by
Tenant in the observance or performance of any of the material terms, covenants
or conditions of this Lease by Tenant or (ii) any negligence or willful
misconduct of Tenant, its agents, servants, employees invitees or licensees of
Tenant in, on, or about the Premises, or any part of the Complex, either during
prior occupancy or during the Term of this Lease.

               (b)  Landlord agrees to indemnify Tenant against and save Tenant
harmless from any and all loss, cost liability, damage, and expense, including
without limitation penalties, fines and reasonable attorneys' fees and
disbursements, incurred in connection with or arising from (i) any default or
breach by Landlord in the observance of the material terms, covenants, or
conditions of this Lease by the Landlord, or (ii) any negligence or willful
misconduct of Landlord, or its contractors, agents, servants, employees,
invitees, or licensees in, on, or about the Premises, or any part of the
Complex, either during prior occupancy or during the Term of this Lease. 
Notwithstanding the foregoing, and in no event (except for Landlord's negligence
or willful misconduct, unless expressly defined in this Lease) shall Landlord be
liable for indirect or consequential damages of Tenant (including lost profits)
however occurring.

          11.2 EXEMPTION OF LANDLORD FROM LIABILITY.  Except for Landlord's
negligence or willful misconduct, Landlord shall not be liable for injury or
damage which may be sustained by the person or property of Tenant, its
employees, invitees or customers, or any other person in or about the Premises
caused by or resulting from fire, steam, electricity, gas, water or rain, which
may leak or flow from or into any part of the Premises, or from the breakage,
leakage, obstruction or other defects of the pipes, sprinklers, wires,
appliances, plumbing, air conditioning, telephone cabling or wiring, or lighting
fixtures of the same, whether the damage or injury results from conditions
arising upon the Premises or upon other portions of the Building of which the
Premises are a part, or from 


                                    -13-

<PAGE>

other sources.  Landlord shall not be liable for any damages arising from any 
act or neglect of any other tenant of the Building.

     12.  INSURANCE

          12.1 COVERAGE.  Tenant shall, at all times during the term of this 
Lease, and at its own cost and expense, procure and continue in force the 
following insurance coverage:

               (a)  Commercial General Liability Insurance with a combined
single limit for personal or bodily injury and property damage of not less
than $2,000,000 or such other reasonable level of coverage that Landlord may
require in its reasonable judgment.

               (b)  Fire and Extended Coverage Insurance, including vandalism
and malicious mischief coverage, covering and in an amount equal to the full
replacement value of all fixtures, furniture and improvements installed in the
Premises by or at the expense of Tenant.

          12.2 INSURANCE POLICIES.  The aforementioned minimum limits of
policies shall in no event limit the liability of Tenant hereunder.  The
aforesaid insurance shall name Landlord and its partners, property manager, and
mortgagees as an additional insured.  Said insurance shall be with a responsible
insurer, preapproved by Landlord and Landlord's insurer, which approval shall
not be unreasonably withheld, licensed to do business in California.  Tenant
shall furnish from the insurance companies or cause the insurance companies to
furnish certificates of coverage.  No such policy shall be cancelable or subject
to reduction of coverage or other modification or cancellation except after
thirty (30) days prior written notice to Landlord by the insurer.  All such
policies shall be written as primary policies, not contributing with and not in
excess of the coverage which Landlord may carry.  Tenant shall, at least twenty
(20) days prior to the expiration of such policies, furnish Landlord with
evidence of renewals or binders.  Tenant agrees that if Tenant does not take out
and maintain such insurance, Landlord may (but shall not be required to) procure
said insurance on Tenant's behalf and charge Tenant the premiums together with a
reasonable handling charge and Default Interest from the date paid by Landlord,
payable upon demand.  Tenant shall have the right to provide such insurance
coverage pursuant to blanket policies obtained by Tenant, provided such blanket
policies expressly afford coverage to the Premises and to Tenant as required by
this Lease.

          12.3 LANDLORD'S INSURANCE.  During the term of this Lease Landlord
shall maintain in effect insurance on the Building against fire, extended
coverage perils and vandalism and malicious mischief (to the extent such
coverages are available), with responsible insurers licensed to do business in
California, insuring the Building in an amount equal to at least ninety-five
percent (95%) of the replacement cost thereof, excluding foundations, footings
and underground installations.  Landlord may, but shall not be obligated to,
carry insurance against additional perils and/or in greater amounts.

          12.4 WAIVER OF SUBROGATION.  To the extent permitted by their
respective policies of insurance, Landlord and Tenant each hereby waive any
right of recovery against the other and the authorized representatives of the
other for any loss or damage that is covered by any policy of insurance
maintained by either party with respect to the Premises or the Project or any
operation 


                                    -14-

<PAGE>

therein.  If any policy of insurance relating to this Lease, the Premises or 
the Project does not permit the foregoing waiver or if the coverage under any 
such policy would be invalidated as a result of such waiver, the party 
maintaining such policy shall, if possible, obtain from the insurer under 
such policy a waiver of all right of recovery by way of subrogation against 
either party in right of recovery by way of subrogation against either party 
in connection with any claim, loss or damage covered by such policy.

     13.  DAMAGE OR DESTRUCTION

          13.1 LANDLORD'S DUTY TO REPAIR.  If all or a substantial part of the
Premises are rendered untenantable or inaccessible by damage to all or any part
of the Project from fire or other casualty then, unless either party elects to
terminate this Lease pursuant to Paragraphs 13.2 or 13.3, Landlord shall, at its
expense, use its best efforts to repair and restore the Premises and/or access
thereto, as the case may be, to substantially their former condition to the
extent permitted by the then applicable codes, laws and regulations; provided,
however, that Tenant rather than Landlord shall be obligated at Tenant's expense
to repair or replace Tenant's personal property, trade fixtures and any items or
improvements that are required to be covered by Tenant's insurance under
Paragraph 12.1(b).

          If Landlord is required or elects to repair damage to the Premises 
and/or access thereto, this Lease shall continue in effect but Tenant's Base 
Rent and Operating Cost Payments from the date of the casualty through the 
date of substantial completion of the repair shall be abated by a 
proportionate amount based on the portion of the Premises that Tenant is 
prevented from using by reason of such damage or its repair; provided, 
however, that if the casualty is the result of the willful misconduct or 
negligence of Tenant or Tenant's Representatives, there will be no such 
rental abatement. In no event shall Landlord be liable to Tenant by reason of 
any injury to or interference with Tenant's business or property arising from 
fire or other casualty or by reason of any repairs to any part of the Project 
made necessary by such casualty.

          13.2 LANDLORD'S RIGHT TO TERMINATE.  Landlord may elect to terminate
this Lease, effective as of the last day of the calendar month in which such
election is made, under the following circumstances:

               (a)  Where, in the reasonable judgment of Landlord, the damage
cannot be substantially repaired and restored under applicable laws and
governmental regulations within one hundred eighty (180) days after the date of
the casualty;

               (b)  Where, in the reasonable judgment of Landlord, adequate
proceeds are not, for any reason, made available to Landlord from Landlord's
insurance policies to make the required repairs;

               (c)  Where the Project is damaged or destroyed to the extent that
the cost to repair and restore the Project exceeds twenty-five percent (25%) of
the full replacement cost of the Project, whether or not the Premises are
damaged or destroyed; or

               (d)  Where the damage occurs within the last twelve (12) months
of the term of the Lease.

                    If any of the circumstances described in this Paragraph 13.2
arise, Landlord must notify Tenant in writing of that fact within sixty (60)
days after such circumstances arise and in such notice Landlord must also advise
Tenant whether Landlord has elected to terminate the Lease.


                                    -15-

<PAGE>

          13.3 TENANT'S RIGHT TO TERMINATE.  Tenant shall have the right to
terminate this Lease if all or a substantial part (greater than 50% of the
Premises) of the Premises are rendered untenantable or inaccessible by damage to
all or any part of the Project from fire or other casualty, provided that such
casualty is not the result of the willful misconduct or negligence of Tenant or
Tenant's Representatives, but only under the following circumstances:

               (a)  Tenant may elect to terminate this Lease if Landlord had the
right under Paragraph 13.2 to terminate this Lease but did not elect to so
terminate and Landlord failed to commence the required repair within ninety (90)
days after the date it received proceeds to commence such repair. In such
event, Tenant may terminate this Lease as of the date of the casualty by notice
to Landlord given before the earlier of the date on which Landlord commences
such repair or ten (10) days after the expiration of such ninety (90)-day
period; or

               (b)  Tenant may elect to terminate this Lease in the circumstance
described in Subparagraph 13.2 (a).  In such event, Tenant may terminate this
Lease as of the date of the casualty by notice to Landlord given within thirty
(30) days after Landlord's notice to Tenant pursuant to Paragraph 13.2.

          13.4 EXCLUSIVE RIGHTS.  Landlord and Tenant each hereby agree that,
notwithstanding any law to the contrary that may now or hereafter exist, neither
party shall have any right to terminate this Lease in the event of any damage or
destruction under any circumstances other than as provided in Paragraphs 13.2
and 13.3.

     14.  CONDEMNATION

          If all or a material portion of the Premises shall be taken or
appropriated for public or quasi-public use by right of eminent domain with or
without litigation or transferred by agreement in connection with such public or
quasi-public use, either party hereto shall have the right at its option,
exercisable within thirty (30) days of receipt of notice of such taking, to
terminate this Lease as of the date possession is taken by the condemning
authority, provided, however, that before Tenant may terminate this Lease by
reason of taking or appropriation as provided hereinabove, such taking or
appropriation shall be of such an extent and nature as to substantially
handicap, impede or impair Tenant's use of the Premises. If any part of the
Building other than the Premises shall be so taken or appropriated, Landlord
shall have the right at its option to terminate this Lease.  No award for any
partial or entire taking shall be apportioned, and Tenant hereby assigns to
Landlord any award which may be made in such taking or condemnation, together
with any and all rights of Tenant now or hereafter arising in or to the same or
any part thereof; provided, however, that nothing contained herein shall be
deemed to give Landlord any interest in or to require Tenant to assign to
Landlord any award made to Tenant for the taking of personal property and
fixtures belonging to Tenant and/or for Tenant's unamortized cost of leasehold
improvements, reasonable moving or relocation expenses, so long as such award to
Tenant does not decrease the value of the award that would otherwise be made to
Landlord in such taking or condemnation.  In the event of a partial taking which
does not result in a termination of this Lease, rent shall be abated in the
proportion which the part of Premises so made unusable bears to the rented area
of the Premises immediately prior to the taking, and Landlord, at 


                                    -16-

<PAGE>

Landlord's cost, shall restore the Premises remaining to an architectural 
whole with the Base Rent reduced in proportion to what the area taken bears 
to the Premises prior to the taking.  No temporary taking of the Premises 
and/or of Tenant's rights therein or under this Lease shall give Tenant the 
right to terminate this Lease or to any abatement of Rent thereunder.  Any 
award made to Tenant by reason of any such temporary taking where Landlord 
does not terminate this Lease shall belong entirely to Tenant so long as said 
award does not diminish Landlord's award.

     15.  ASSIGNMENT AND SUBLETTING

          15.1 LANDLORD'S CONSENT REQUIRED.  Tenant shall not assign, transfer,
mortgage, pledge, hypothecate or encumber this Lease or any interest therein
(each a "Transfer"), and shall not sublet the Premises or any part thereof,
without the prior written consent of Landlord and any attempt to do so without
such consent being first had and obtained shall be wholly void and shall
constitute a breach of this Lease.

          15.2 REASONABLE CONSENT.

               (a)  If Tenant complies with the following conditions, Landlord
shall not unreasonably withhold its consent to the subletting of the Premises or
any portion thereof or the assignment of this Lease.  Tenant shall submit in
writing to Landlord (i) the name and legal composition of the proposed subtenant
or assignee; (ii) the nature of the business proposed to be carried on in the
Premises; (iii) the terms and provisions of the proposed sublease; (iv) such
reasonable financial information as Landlord may request concerning the proposed
subtenant or assignee; and (v) the form of the proposed sublease or assignment.
Within ten (10) business days after Landlord receives all such information it
shall notify Tenant whether it approves such assignment or subletting or if it
elects to proceed under Paragraph 15.8 below.

               (b)  The parties hereto agree and acknowledge that, among 
other circumstances for which Landlord could reasonably withhold its consent 
to a sublease or assignment, it shall be reasonable for Landlord to withhold 
its consent where (i) the assignee or subtenant (a "Transferee") does not 
itself occupy the entire portion of the Premises assigned or sublet, (ii) 
Landlord reasonably disapproves of the Transferee's reputation or 
creditworthiness or the character of the business to be conducted by the 
Transferee at the Premises, (iii) the assignment or subletting would increase 
the burden on the Building services or the number of people occupying the 
Premises, or (iv) Landlord otherwise determines that the assignment or 
sublease would have the effect of decreasing the value of the Project or 
increasing the expenses associated with operating the Project. In no event 
may Tenant publicly advertise or offer all or any portion of the Premises for 
assignment or sublease at a rental less than that then sought by Landlord for 
comparable space in the project.

          15.3 EXCESS CONSIDERATION.  In the event of an assignment or 
sublease to an affiliate or wholly-owned subsidiary of Tenant, Tenant shall 
be entitled to 100% of any additional Rent or excess consideration.  If 
Landlord consents to the assignment or sublease, Landlord shall be entitled 
to receive as additional Rent hereunder one-half of any consideration paid by 
the Transferee for the assignment or sublease and, in the case of a sublease, 
one-half of the excess of the rent and other 

                                    -17-

<PAGE>

consideration payable by the subtenant over the amount of Base Rent and 
Operating Cost Payments payable hereunder applicable to the subleased space.

          15.4 NO RELEASE OF TENANT.  No consent by Landlord to any assignment
or subletting by Tenant shall relieve Tenant of any obligation to be performed
by Tenant under this Lease, whether occurring before or after such consent,
assignment or subletting, and the Transferee shall be jointly and severally
Tenant for the payment of Rent (or that portion applicable to the subleased
space in the case of a sublease) and for the performance of all other terms and
provisions of the Lease.  The consent by Landlord to any assignment or
subletting shall not relieve Tenant and any such Transferee from the obligation
to obtain Landlord's express written consent to any subsequent assignment or
subletting.  The acceptance of rent by Landlord from any other person shall not
be deemed to be a waiver by Landlord of any provision of this Lease or to be a
consent to any assignment, subletting or other transfer.  Consent to one
assignment, subletting or other transfer shall not be deemed to constitute
consent to any subsequent assignment, subletting or other transfer.

          15.5 ATTORNEYS' FEES.  Tenant shall pay Landlord's reasonable
attorneys' fees (not to exceed $500.00] incurred in connection with reviewing
any proposed assignment or sublease.

          15.6 TRANSFER OF OWNERSHIP INTEREST.  Subject to the provisions of
Paragraph 15.10, if Tenant is a business entity, any direct or indirect transfer
of 50 percent or more of the ownership interest of the entity (whether all at
one time or over the term of the Lease) shall be deemed a Transfer.

          15.7 EFFECTIVENESS OF TRANSFER.  No permitted assignment by Tenant
shall be effective until Landlord has received a counterpart of the assignment
and an instrument in which the assignee assumes all of Tenant's obligations
under this Lease arising on or after the date of assignment.  The voluntary,
involuntary or other surrender of this Lease by Tenant, or a mutual cancellation
by Landlord and Tenant, shall not work a merger, and any such surrender or
cancellation shall, at the option of Landlord, either terminate all or any
existing subleases or operate as an assignment to Landlord of any or all of such
subleases.

          15.8 LANDLORD'S RIGHT TO SPACE.  Except for the provisions set forth
in 15.6, notwithstanding any of the above provisions of this Paragraph 15 to the
contrary, if Tenant notifies Landlord that it desires to assign this Lease or
sublet all or any part of the Premises, Landlord, in lieu of consenting to such
assignment or sublease, may elect to terminate this Lease (in the case of an
assignment or a sublease of the entire Premises), or to terminate this Lease as
it relates to the space proposed to be subleased by Tenant (in the case of a
sublease of less than the entire Premises).  In such event, this Lease (or
portion thereof) will terminate on the date the assignment or sublease was to be
effective, and Landlord may lease such space to any party, including the
prospective Transferee identified by Tenant.

          15.9 NO NET PROFITS LEASES.  Anything contained in the foregoing
provisions of this Paragraph 15 to the contrary notwithstanding, neither Tenant,
nor any other person having an interest in the possession, use, occupancy or
utilization of the Premises, shall enter into any lease, sublease, 


                                    -18-

<PAGE>

license, concession or other agreement for the use, occupancy or utilization 
of space in the Premises which provides for rental or other payment for such 
use, occupancy or utilization based in whole or in part on the net income or 
profits derived by any person from the premises leased, used, occupied or 
utilized (other than an amount based on a fixed percentage or percentages of 
receipts or sales), and any such purported lease, sublease, license, 
concession or other agreement shall be void and ineffective as a conveyance 
of any right or interest in the possession, use, occupancy or utilization of 
any part of the Premises.

          15.10     PERMITTED ASSIGNMENT OR SUBLEASE.  Notwithstanding any
provision to the contrary in Section 15, Tenant shall not be required to obtain
Landlord's consent to an assignment or sublease of the Premises to an entity
which controls, is controlled by or is under common control with Tenant or which
succeeds to substantially all of Tenant's assets and business by merger,
reorganization or purchase provided that such entity has a net worth equal to or
greater than that of Tenant's net worth as of the Commencement Date of this
Lease.

   16.    SUBORDINATION

          16.1 SUBORDINATION.  Except as provided in the next sentence, or as
the Tenant and the mortgagee or trustee of any "First Mortgage" (as defined
below) may otherwise agree, this Lease, at Landlord's option, shall be subject
and subordinate to all ground or underlying leases which now exist or may
hereafter be executed affecting all or any part of the Project, and to the lien
of any first mortgages or first deeds of trust (each a "First Mortgage") in any
amount or amounts whatsoever now or hereafter placed on or against the Land or
Building, Landlord's interest or estate therein, or any ground or underlying
lease, without the necessity of the execution and delivery of any further
instruments on the part of Tenant to effectuate such subordination.  If any
mortgagee or trustee of a First Mortgage or ground lessor shall elect to have
this Lease prior to the lien of its First Mortgage or ground lease, and shall
give written notice thereof to Tenant, this Lease shall be deemed prior to such
First Mortgage or ground lease, whether this Lease is dated prior to or
subsequent to the date of said First Mortgage or ground lease or the date of the
recording thereof.

          16.2 JUNIOR LIENS.  Tenant hereby agrees that this Lease shall be
superior to the lien of any present or future mortgages or deeds of trust that
are junior to any First Mortgage.

          16.3 SUBORDINATION AGREEMENTS.  Tenant will execute and deliver upon
demand without charge therefor, except for Tenant's reasonable attorneys' fees
(not to exceed $500.00) such further instruments evidencing the subordination of
this Lease to any First Mortgage or ground lease, or the subordination of any
First Mortgage or ground lease to such Lease, pursuant to Section 16.1, as the
case may be, as may be required by Landlord.  Tenant's failure to comply with
its obligations under this Paragraph 16.3 within thirty (30) days of demand
shall constitute an Event of Default and Landlord shall have the right, in such
event, to impose upon Tenant a monetary penalty of $1,000.00 for such
noncompliance, in addition to all other remedies available to Landlord under
this Lease and by law.


                                    -19-

<PAGE>

          16.4 ATTORNMENT.  If this Project is transferred to any purchaser
pursuant to or in lieu of proceedings to enforce any mortgage, deed of trust or
ground lease (collectively, "Encumbrance"), and this Lease will not be barred,
terminated, cut off or foreclosed nor will the rights and possession of Tenant
thereunder be disturbed if Tenant is not in default under the terms of the
Lease.  Tenant shall attorn to such purchaser as the Landlord under the Lease so
long as the rights of Tenant hereunder shall not be disturbed, diminished, or
interfered with, but shall continue in full force and effect so long as Tenant
shall not be in default hereunder, is either prior to such Encumbrance or the
mortgagee or trustee of a First Mortgage or ground lessor of the Project elects
to have this Lease survive such transfer, Tenant shall attorn to such purchaser
and recognize such purchaser as the landlord under this Lease, and this Lease
shall continue as a direct lease between such purchaser and Tenant.

     17.  OUIET ENJOYMENT

          Landlord covenants and agrees with Tenant that upon Tenant paying the
Rent and performing its other covenants and conditions under this Lease, Tenant
shall have the quiet possession of the Premises for the term of this Lease as
against any persons or entities lawfully claiming by, through or under Landlord,
subject, however, to the terms of this Lease and of any Encumbrance.

     18.  DEFAULT; REMEDIES

          18.1 DEFAULT.  The occurrence of any of the following shall constitute
an "Event of Default" by Tenant:

               (a)  Tenant fails to pay Rent when due and such failure continues
for five (5) days after written notice thereof to Tenant;

               (b)  Tenant fails to deliver any subordination agreement
requested by Landlord within the period described in Paragraph 16;

               (c)  Tenant fails to deliver any estoppel certificate requested
by Landlord within the period described in Paragraph 22;

               (d)  Tenant Transfers or attempts to Transfer this Lease without
complying with the provisions of Paragraph 15;

               (e)  Tenant fails to observe and perform any other provision of
this Lease to be observed or performed by Tenant, where such failure continues
for twenty (20) days after written notice thereof by Landlord to Tenant;
provided, however, that if the nature of the default is such that the same
cannot reasonably be cured within said twenty (20) day period, Tenant shall not
be deemed to be in default if Tenant shall within such period commence such cure
and thereafter diligently prosecute the same to completion;


                                    -20-

<PAGE>

               (f)  Tenant abandons the Premises; or

               (g)  The making by Tenant of any general assignment or general
arrangement for the benefit of creditors; the filing by or against Tenant of a
petition seeking relief under any law relating to bankruptcy (unless, in the
case of a petition filed against Tenant, the same is dismissed within sixty (60)
days); the appointment of a trustee or receiver to take possession of
substantially all of Tenant's assets located at the Premises or of Tenant's
interest in this Lease, where possession is not restored to Tenant within thirty
(30) days; or the attachment, execution or other judicial seizure of
substantially all of Tenant's assets located at the Premises or of Tenant's
interest in this Lease, where such seizure is not discharged within thirty (30)
days.

          18.2 REMEDIES.  Upon the occurrence of an Event of Default, Landlord
may, at any time thereafter exercise the following remedies, which shall be in
addition to any other rights or remedies now or hereafter available to Landlord
at law or in equity:

               (a)  Maintain this Lease in full force and effect and recover
Rent as it becomes due, without terminating Tenant's right to possession
irrespective of whether Tenant shall have abandoned the Premises.  In the event
Landlord elects not to terminate the Lease, Landlord shall have the right to
attempt to relet the Premises at such rent and upon such conditions and for such
a term, and to do all acts necessary to maintain or preserve the Premises as
Landlord deems reasonable and necessary without being deemed to have elected to
terminate the Lease, including removal of all persons and property from the
Premises; such property may be removed and stored in a public warehouse or
elsewhere at the cost of and for the account of Tenant.  In the event any such
reletting occurs, rents received by Landlord from such subletting shall be
applied (i) first, to the payment of the costs of maintaining, preserving,
altering and preparing the Premises for subletting and other costs of
subletting, including but not limited to brokers' commissions, attorneys' fees
and expenses of removal of Tenant's personal property, trade fixtures,
alterations and leasehold improvements; (ii) second, to the payment of Rent then
due and payable; (iii) third, to the payment of future Rent as the same may
become due and payable hereunder; and (iv) fourth, the balance, if any, shall be
paid to Tenant upon (but not before) expiration of the term of this Lease.  If
the rents received by Landlord from such subletting, after application as
provided above, are insufficient in any month to pay the Rent due and payable
hereunder for such month, Tenant shall pay such deficiency to Landlord monthly
upon demand.  Notwithstanding any such subletting for Tenant's account without
termination, Landlord may at any time thereafter, by written notice to Tenant,
elect to terminate this Lease by virtue of a previous Event of Default. During
the continuance of an Event of Default, for so long as Landlord does not
terminate Tenant's right to possession of the Premises, Landlord shall not
unreasonably withhold its consent to an assignment of this Lease or a sublease
of the Premises as set forth in Paragraph 15.2 - "Reasonable Consent".

               (b)  Terminate Tenant's right to possession of the Premises at
any time by written notice to Tenant, in which case Tenant shall immediately
surrender possession of the Premises to Landlord.  Tenant expressly acknowledges
that in the absence of such written notice from Landlord, no other act of
Landlord, including, but not limited to, its re-entry into the Premises, its
efforts to relet the Premises, its reletting of the Premises for Tenant's
account, its storage of Tenant's 


                                    -21-

<PAGE>

personal property and trade fixtures, its acceptance of keys to the Premises 
from Tenant or its exercise of any other rights and remedies under this 
Paragraph 18.2, shall constitute an acceptance of Tenant's surrender of the 
Premises or constitute a termination of this Lease or of Tenant's right to 
possession of the Premises.  If Landlord terminates Tenant's right to 
possession in writing, Landlord shall be entitled to recover from Tenant all 
damages as provided in California Civil Code Section 1951.2 or any other 
applicable existing or future law, ordinance or regulation providing for 
recovery of damages for such breach, including but not limited to the 
following:

                    (1)  The reasonable cost of recovering the Premises; plus

                    (2)  The reasonable cost of removing Tenant's alterations,
trade fixtures and Above-Standard Improvements; plus

                    (3)  All unpaid Rent due or earned hereunder prior to the
date of termination, less the proceeds of any reletting or any rental received
from subtenants prior to the date of termination applied as provided in
subsection (a) above, together with interest at the Default Rate, on such sums
from the date such Rent is due and payable until the date of the award of
damages; plus

                    (4)  The amount by which the Rent which would be payable by
Tenant hereunder, including Operating Cost Payments as reasonably estimated by
Landlord, from the date of termination until the date of the award of damages
exceeds the amount of such rental loss Tenant proves could have been reasonably
avoided, together with interest at the Default Rate on such sums from the date
such Rent is due and payable until the date of the award of damages; plus

                    (5)  The amount by which the Rent which would be payable by
Tenant hereunder, including Operating Cost Payments, as reasonably estimated by
Landlord, for the remainder of the then term, after the date of the award of
damages exceeds the amount of such rental loss as Tenant proves could have been
reasonably avoided, discounted at the discount rate published by the Federal
Reserve Bank of San Francisco for member banks at the time of the award plus one
percent (l%); plus

                    (6)  Such other amounts in addition to or in lieu of the
foregoing as may be permitted from time to time by applicable law.

               (c)  During the continuance of an Event of Default, Landlord may
enter the Premises without terminating this Lease and remove all Tenant's
personal property, and trade fixtures from the Premises.  If Landlord removes
such property from the Premises and stores it at Tenant's risk and expense, and
if Tenant fails to pay the cost of such removal and storage after written demand
therefor and/or to pay any Rent then due, after the property has been stored for
a period of thirty (30) days or more Landlord may sell such property at public
or private sale, in the manner and at such times and places as Landlord in its
sole discretion deems commercially reasonable following reasonable notice to
Tenant of the time and place of such sale.  The proceeds of any such sale shall
be applied first to the payment of the expenses for removal and storage of the
property, preparation for 


                                    -22-

<PAGE>

and conducting such sale, and attorneys' fees and other legal expenses 
incurred by Landlord in connection therewith, and the balance shall be 
applied as provided in subsection (a) above.

     Tenant hereby waives all claims for damages that may be caused by
Landlord's reentering and taking possession of the Premises or removing and
storing Tenant's personal property pursuant to this Paragraph, and Tenant shall
hold Landlord harmless from and against any loss, cost or damage resulting from
any such act.  No reentry by Landlord shall constitute or be construed as a
forcible entry by Landlord.

               (d)  Landlord may cure the Event of Default at Tenant's expense. 
If Landlord pays any sum or incurs any expense in curing the Event of Default,
Tenant shall reimburse Landlord upon demand for the amount of such payment or
expense with interest at the Default Rate from the date the sum is paid or the
expense is incurred until Landlord is reimbursed by Tenant.

          18.3 LATE CHARGES.  Tenant hereby acknowledges that late payment by
Tenant to Landlord of Rent will cause Landlord to incur costs not contemplated
by this Lease, the exact amount of which will be extremely difficult to
ascertain.  Such costs include, but are not limited to, processing and
accounting charges. Accordingly, if any installment of Base Rent, Rent, or
Operating Costs Payments is not received by Landlord or Landlord's designee
within seven (7) days of the date such amount shall be due, or if any
installment of other Rent is not received by Landlord or Landlord's designee on
or before the date such amount shall be due, Tenant shall pay to Landlord a late
charge equal to five percent (5%) of such overdue amount.  The parties hereby
agree that such late charge represents a fair and reasonable estimate of the
costs Landlord will incur by reason of late payment by Tenant. Acceptance of
such late charge by Landlord shall in no event constitute a waiver of Tenant's
default with respect to such overdue amount nor prevent Landlord from exercising
any of the other rights and remedies granted hereunder.  Notwithstanding the
foregoing, Tenant is hereby granted one (1) grace period which shall not exceed
fifteen (15) days during each calendar year of this Lease.

          18.4 INTEREST.  In addition to the late charges referred to above
which are intended to defray Landlord's costs resulting from late payments, any
late payment of Rent shall, at Landlord's option, bear interest from the due
date of any such payment to the date the same is paid at the Default Rate,
provided, however, that if Landlord imposes a late charge on any overdue
payment, such overdue payment shall not begin to bear interest under this
Paragraph 18.4 until thirty (30) days after the due date thereof.

          18.5 DEFAULT BY LANDLORD.  Landlord shall not be in default unless
Landlord fails to perform obligations required of Landlord within a reasonable
time, but in no event later than thirty (30) days after written notice by Tenant
to Landlord and to any mortgagee, trustee or ground lessor of the Project (each
a "Holder") whose name and address shall have theretofore been furnished to
Tenant in writing, specifying that Landlord has failed to perform such
obligations; provided, however, that if the nature of Landlord's obligation is
such that more than thirty (30) days are required for performance, then Landlord
shall not be in default if Landlord commences performance within such thirty
(30) day period and thereafter diligently prosecutes the same to completion.


                                    -23-

<PAGE>

     19.  PARKING

          At no additional charge during the initial Lease Term, Tenant and
Tenant's employees, invitees and customers shall have the right to use the
parking areas of the Building subject to such regulations as Landlord shall
adopt from time to time, and subject to the right of Landlord to restrict the
use by Tenant and Tenant's Representatives when in the sole judgment of Landlord
such use is excessive for the parking area in relationship to the reasonable use
required by other Tenants.  If Landlord becomes obligated under applicable laws
or regulations or any other directive of any governmental or quasi-governmental
authority to pay or assess fees or charges for parking in the Building's parking
area, Tenant shall pay such amounts to Landlord as additional Rent.

     20.  RELOCATION OF PREMISES

          20.1 CONDITIONS.  For the purpose of maintaining an economical and
proper distribution of Tenants throughout Bishop Ranch acceptable to Landlord,
Landlord shall have the right from time to time during the term of this Lease to
relocate the Premises within Bishop Ranch, subject to the following terms and
conditions:

               (a)  The rented and usable areas of the new Premises must be of
equal size to the existing Premises (subject to a variation of up to ten percent
(10%) provided the amount of Base Rent payable under this Lease is not
increased);

               (b)  Landlord shall pay the cost of providing tenant improvements
in the new Premises comparable to the tenant improvements in the existing
Premises;

               (c)  Landlord shall pay the expenses reasonably incurred by
Tenant in connection with such substitution of Premises, including but not
limited to costs of moving, door lettering, telephone relocation and reasonable
quantities of new stationery and Tenant literature;

          20.2 NOTICE.  Landlord shall deliver to Tenant written notice of
Landlord's election to relocate the Premises, specifying the new location and
the amount of rent payable therefore at least one hundred twenty (120) days
prior to the date the relocation is to be effective.  If the relocation of the
Premises is not acceptable to Tenant, Tenant for a period of ten (10) days after
receipt of Landlord's notice to relocate shall have the right (by delivering
written notice to Landlord) to terminate this Lease.  If Tenant so notifies
Landlord, Landlord at its option may withdraw its relocation notice, in which
event this Lease shall continue and Tenant shall not be relocated, or accept
Tenant's termination notice, in which event this Lease shall terminate effective
as of the date the relocation was to be effective.

     21.  MORTGAGEE PROTECTION

          Tenant agrees to give any Holder, by registered mail, a copy of any
notice of default served upon the Landlord, provided that prior to such notice
Tenant has been notified in writing (by way of notice of assignment of rents and
leases, or otherwise) of the address of such Holder.  If 


                                    -24-

<PAGE>

Landlord shall have failed to cure such default within the time period set 
forth in Paragraph 18.5 the Holder shall have an additional thirty (30) days 
within which to cure such default or if such default cannot be cured within 
that time, then such additional time as may be necessary to cure such default 
(including the time necessary to foreclose or otherwise terminate its 
Encumbrance, if necessary to effect such cure), and this Lease shall not be 
terminated so long as such remedies are being diligently pursued.

     22.  ESTOPPEL CERTIFICATES

          (a)  Upon ten (10) days' notice from Landlord, Tenant shall execute
and deliver to Landlord, in form reasonably provided by or satisfactory to
Landlord, a certificate stating that this Lease is in full force and effect,
describing any amendments or modifications hereto, acknowledging that this Lease
is subordinate or prior, as the case may be, to any Encumbrance and stating any
other information Landlord may reasonably request, including the term of this
Lease, the monthly Base Rent, the estimated Operating Cost Payments, the date to
which Rent has been paid, the amount of any security deposit or prepaid Rent,
whether either party hereto is in default under the terms of the Lease, whether
Landlord has completed its construction obligations hereunder and any other
information reasonably requested by Landlord. Any person or entity purchasing,
acquiring an interest in or extending financing with respect to the Project
shall be entitled to rely upon any such certificate.

          (b)  Tenant's failure to deliver such statement within such time shall
be conclusive upon Tenant:

               (1)  That this Lease is in full force and effect, without
modification except as may be represented by Landlord;

               (2)  That there are no uncured defaults in Landlord's
performance; and

               (3)  That not more than one month's Rent has been paid in
advance; and

               (4)  That Landlord has completed its construction obligations.

          (c)  If Landlord desires to finance or refinance the Building, or any
part thereof, Tenant hereby agrees to deliver to any lender designated by
Landlord such financial statements of Tenant as may be reasonably required by
such lender which are then in the possession of Tenant provided such financial
statements shall be held in the strictest confidence.  All such financial
statements shall be received by Landlord in confidence and shall be used only
for the purposes herein set forth.

     23.  SURRENDER. HOLDING OVER

          23.1 SURRENDER.  Upon the expiration or termination of this Lease,
Tenant shall surrender the Premises to Landlord in its original condition,
except for reasonable wear and tear and damage from casualty or condemnation;
provided, however, that prior to the expiration or 


                                    -25-

<PAGE>

termination of this Lease Tenant shall remove from the Premises all Tenant's 
personal property, trade fixtures, alterations and other Above-Standard 
Improvements that Tenant has the right or is required by Landlord to remove 
under the provisions of this Lease. Tenant shall also be responsible for 
removal of all CRT, data and telephone equipment, and any other form of 
cabling. that exists in Tenant's space.  If any of such removal is not 
completed at the expiration or termination of this Lease, Landlord may remove 
the same at Tenant's expense.  Any damage to the Premises or the Building 
caused by such removal shall be repaired promptly by Tenant or, if Tenant 
fails to do so, Landlord may do so at Tenant's expense, in which event Tenant 
shall immediately reimburse Landlord for such expenses together with interest 
at the Default rate until so paid.  Tenant's obligations under this Paragraph 
shall survive the expiration or termination of this Lease.  Upon expiration 
or termination of this Lease or of Tenant's possession, Tenant shall 
surrender all keys to the Premises or any other part of the Building and 
shall make known to Landlord the combination of locks on all safes, cabinets 
and vaults that may be located in the Premises.

          23.2 HOLDING OVER.  If Tenant remains in possession of the Premises
after the expiration or termination of this Lease, Tenant's continued possession
shall be on the basis of a tenancy at the sufferance of Landlord, and Tenant
shall continue to comply with or perform all the terms and obligations of the
Tenant under this Lease, except that the Base Rent during Tenant's holding over
shall be one hundred twenty-five percent (25%) of the monthly Base Rent payable
in the last month prior to the termination or expiration hereof.  Tenant shall
indemnify and hold Landlord harmless from and against all claims, liability,
damages, costs or expenses, including reasonable attorneys fees and costs of
defending the same, incurred by Landlord and arising directly or indirectly from
Tenant's failure to timely surrender the Premises, including (i) any loss, cost,
penalties, or damages, including lost profits, claimed by any prospective tenant
of the Premises, and (ii) Landlord's damages as a result of such prospective
tenant rescinding or refusing to enter into the prospective lease of the
Premises by reason of such failure to timely surrender the Premises.

     24.  HAZARDOUS MATERIALS

          Tenant shall not (either with or without negligence) cause or permit
the escape, disposal or release of any biologically or chemically active or
other hazardous substances or materials. Tenant shall not allow the storage or
use of such substances or materials in any manner not sanctioned by law or by
the highest standards prevailing in the industry for the storage and use of such
substances or materials, nor allow to be brought into the Project any such
materials or substances except to use in the ordinary course of Tenant's
business, and then only after written notice is given to Landlord of the
identity of such substances or materials.  Without limitation, hazardous
substances and materials shall include those described in the Comprehensive
Environmental Response Compensation and Liability Act of 1980, as amended, 42
U.S.C. Section 9601 et seq., any applicable state or local laws and the
regulations adopted under these acts.  If any lender or governmental agency
shall ever require testing to ascertain whether or not there has been any
release of hazardous materials used or stored by Tenant in the Premises, then
Tenant shall promptly notify Landlord of the same, and the reasonable costs
thereof shall be reimbursed by Tenant to Landlord upon demand as additional
charges if such requirement applies to the Premises due to Tenant's use or
storage thereof.  Landlord shall have the right, but not the obligation, to
enter the Premises at any 


                                    -26-

<PAGE>

reasonable time to perform any required testing, to confirm Tenant's 
compliance with the provisions of this Paragraph, and to perform Tenant's 
obligations under this Paragraph if Tenant has failed to do so. In addition, 
Tenant shall execute affidavits, representations and the like from time to 
time at Landlord's request concerning Tenant's best knowledge and belief 
regarding the presence of hazardous substances or materials on the Premises.  
In all events, Tenant shall indemnify Landlord in the manner elsewhere 
provided in this Lease from any release of hazardous materials on the 
Premises occurring while Tenant is in possession, or elsewhere if caused by 
Tenant or persons acting under Tenant.  The within covenants shall survive 
the expiration or earlier termination of the lease term.

          24.1 Landlord agrees to indemnify and defend Tenant against any and
all claims, actions, losses, costs, liabilities, damages and expense, including,
without limitation, reasonable attorneys' fees, to the extent caused by the
release of any Hazardous Materials on the Project by Landlord or by reason of
the failure of the Project as of the Commencement Date to comply with the above-
mentioned statutes, laws and regulations related to the regulation of Hazardous
Materials in effect and as interpreted at the date of this Lease.

   25.    MISCELLANEOUS

          25.1 ATTORNMENT.  Upon any transfer by Landlord of Landlord's interest
in the premises or the Building (other than a transfer for security purposes
only), Tenant agrees to attorn to any transferee or assignee of Landlord.

          25.2 CAUTIONS: ATTACHMENTS; DEFINED TERMS.

               (a)  The captions of the paragraphs of this Lease are for
convenience only and shall not be deemed to be relevant in resolving any
question of interpretation or construction of any paragraph of this Lease.  The
provisions of this Lease shall be construed in accordance with the fair meaning
of the language used and shall not be strictly construed against either party. 
When required by the contents of this Lease, the singular includes the plural. 
Wherever the term "including" is used in this Lease, it shall be interpreted as
meaning "including, but not limited to," the matter or matters thereafter
enumerated.

               (b)  Exhibits attached hereto, and addenda and schedules
initialed by the parties, are deemed to constitute part of this Lease and are
incorporated herein.

               (c)  The words "Landlord" and "Tenant" as used herein, shall
include the plural as well as the singular.  Words used in neuter gender include
the masculine and feminine and words in the masculine or feminine gender include
the neuter.  The obligations of this Lease as to a Tenant which consists of
husband and wife shall extend individually to their sole and separate property
as well as community property.

          25.3 ENTIRE AGREEMENT.  This Lease along with any exhibits and
attachments hereto constitutes the entire agreement between Landlord and Tenant
relative to the Premises, and this Lease and the exhibits and attachments may be
altered, amended or revoked only by instrument in writing 


                                    -27-

<PAGE>

signed by both Landlord and Tenant.  Landlord and Tenant agree hereby that 
all prior or contemporaneous oral agreements between and among themselves and 
their agents or representatives relative to the leasing of the Premises are 
merged in or revoked by this Lease.

          25.4 SEVERABILITY.  If any term or provision of this Lease shall, to
any extent, be determined by a court of competent jurisdiction to be invalid or
unenforceable, the remainder of this Lease shall not be affected thereby, and
each term and provision of this Lease shall be valid and be enforceable to the
fullest extent permitted by law.

          25.5 COSTS OF SUIT.

               (a)  If Tenant or Landlord brings any action for the enforcement
or interpretation of this Lease, including any suit by Landlord for the recovery
of Rent or possession of the Premises, the losing party shall pay to the
prevailing party a reasonable sum for attorneys' fees.  The "prevailing party"
will be determined by the court before whom the action was brought based upon an
assessment of which party's major arguments or positions taken in the suit or
proceeding could fairly be said to have prevailed over the other party's major
arguments or positions on major disputed issues in the court's decision.

               (b)  Should Landlord, without fault on Landlord's part, be made a
party to any litigation instituted by Tenant or by any third party against
Tenant, or by or against any person holding under or using the Premises by
license of Tenant, or for the foreclosure of any lien for labor or material
furnished to or for Tenant or any such other person or otherwise arising out of
or resulting from any act or transaction of Tenant or of any such other person,
Tenant covenants to save and hold Landlord harmless from any judgment rendered
against Landlord or the Premises or any part thereof, and all costs and
expenses, including reasonable attorneys' fees, incurred by Landlord in or in
connection with such litigation.

          25.6 TIME; JOINT AND SEVERAL LIABILITY.  Time is of the essence of
this Lease and each and every provision hereof, except as to the conditions
relating to the delivery of possession of the Premises to Tenant. All the terms,
covenants and conditions contained in this Lease to be performed by either
party, if such party shall consist of more than one person or organization,
shall be deemed to be joint and several, and all rights and remedies of the
parties shall be cumulative and nonexclusive of any other remedy at law or in
equity.

          25.7 BINDING EFFECT; CHOICE OF LAW.  The parties hereto agree that all
provisions hereof are to be construed as both covenants and conditions as though
the words imparting such covenants and conditions were used in each separate
paragraph hereof.  Subject to any provisions hereof restricting assignment or
subletting by Tenant, all of the provisions hereof shall bind and inure to the
benefit of the parties hereto and their respective heirs, legal representatives,
successors and assigns.  This Lease shall be governed by the laws of the State
of California.

          25.8 WAIVER.  No covenant, term or condition or the breach thereof
shall be deemed waived, except by written consent of the party against whom the
waiver is claimed, and any waiver or 


                                    -28-

<PAGE>

breach of any covenant, term condition shall not be deemed to be a waiver of 
any preceding or succeeding breach of the same or any other covenant, term or 
condition. Acceptance by Landlord of any performance by Tenant after the time 
the same shall have become due shall not constitute a waiver by Landlord of 
the breach or default of any covenant, term or condition unless otherwise 
expressly agreed to by Landlord in writing.

          25.9 FORCE MAJEURE.  In the event Landlord is delayed, interrupted or
prevented from performing any of its obligations under this Lease, including its
obligations under the Work Letter, and such delay, interruption or prevention is
due to fire, act of God, governmental act, strike, labor dispute, unavailability
of materials or any other cause outside the reasonable control of Landlord and
other than for financial reasons, then the time for performance of the affected
obligations of Landlord shall be extended for a period equivalent to the period
of such delay, interruption or prevention and in the case of work to be
performed by Landlord under the Work Letter, each day of delay under this
Subsection shall result in one (1) Scheduled Commencement Adjustment Day.

          25.10     LANDLORD'S LIABILITY.  The term "Landlord", as used in this
Lease, shall mean only the owner or owners of the Project at the time in
question.  Notwithstanding any other term or provision of this Lease, the
liability of Landlord for its obligations under this Lease is limited solely to
Landlord's interest in the Project as the same may from time to time be
encumbered, and no personal liability shall at any time be asserted or
enforceable against any other assets of Landlord or against Landlord's
stockholders, directors, officers or partners on account of any of Landlord's
obligations or actions under this Lease.  In addition, in the event of any
conveyance of title to the Building or the Project, then from and after the date
of such conveyance, Landlord shall be relieved of all liability with respect to
Landlord's obligations to be performed under this Lease after the date of such
conveyance.  Upon any conveyance of title to the Building or the Project, the
grantee or transferee, by accepting such conveyance, shall be deemed to have
assumed Landlord's obligations to be performed under this Lease from and after
the date of transfer, subject to the limitations on liability set forth above in
this Paragraph 25.10.  In no event will Landlord be liable under this Lease for
consequential or indirect damages or loss of profits.

          25.11     CONSENTS AND APPROVALS.  Wherever the consent, approval, 
judgment or determination of Landlord is required or permitted under this 
Lease, Landlord may exercise its good faith business judgment in granting or 
withholding such consent or approval or in making such judgment or 
determination without reference to any extrinsic standard of reasonableness, 
unless the provision providing for such consent, approval, judgment or 
determination specifies that Landlord's consent or approval is not to be 
unreasonably withheld, or that such judgment or determination is to be 
reasonable, or otherwise specifies the standards under which Landlord may 
withhold its consent. If it is determined that Landlord failed to give its 
consent where it was required to do so under this Lease, Tenant shall be 
entitled to specific performance but not to monetary damages for such 
failure, unless Landlord withheld its consent maliciously and in bad faith. 
Notwithstanding the foregoing, Landlord shall not unreasonably withhold its 
consent or approval.

     The review and/or approval by Landlord of any item to be reviewed or
approved by Landlord under the terms of this Lease or any Exhibits hereto shall
not impose upon Landlord any liability for 


                                    -29-

<PAGE>

accuracy or sufficiency of any such item or the quality or suitability of 
such item for its intended use.  Any such review or approval is for the sole 
purpose of protecting Landlord's interest in the Project under this Lease, 
and no third parties, including Tenant or Tenant's Representatives or any 
person or entity claiming by, through or under Tenant, shall have any rights 
hereunder.

          25.12     SIGNS.  Tenant shall not place or permit to be placed in or
upon the Premises where visible from outside the Premises or any part of the
Building, any signs, notices, drapes, shutters, blinds or displays of any type
without the prior consent of Landlord.  Landlord shall include Tenant in the
Building directories located in the Building.  Landlord reserves the right in
Landlord's sole discretion to place and locate on the roof, exterior of the
Building, and in any area of the Building not leased to Tenant such signs,
notices, displays and similar items as Landlord deems appropriate in the proper
operation of the Building.

          25.13     RULES AND REGULATIONS.  Tenant and Tenant's Representatives
shall observe and comply fully and faithfully with all reasonable and
nondiscriminatory rules and regulations adopted by Landlord for the care,
protection, cleanliness and operation of the Building and its tenants including
those annexed to this Lease as Exhibit D and any modification or addition
thereto adopted by Landlord, provided Landlord shall give written notice thereof
to Tenant.  Landlord shall not be responsible to Tenant for the nonperformance
by any other tenant or occupant of the Building of any of said rules and
regulations.  Notwithstanding the foregoing, Tenant shall not be required to
comply with any new rule or regulation, unless the same applies
nondiscriminatorily to all Tenants of the Project and use not unreasonably
interfere with Tenant's use of the Premises or Tenant's parking rights.

          25.14     NOTICES.  All notices or demands of any kind required or
desired to be given by Landlord or Tenant hereunder shall be in writing and
shall be personally delivered, sent in the United States mail, certified or
registered, postage prepaid, or sent by private messenger, addressed to the
Landlord or Tenant respectively at the addresses set forth below:

Landlord:                          Tenant:

ANNABEL INVESTMENT COMPANY         SUPERGEN, INC.
One Annabel Lane, Suite 201        Attn:  Accounting Administrator
P. O. Box 640                      Two Annabel Lane, Suite 220
San Ramon, CA  94583               San Ramon, CA  94583

or such other address as shall be established by notice to the other pursuant to
this paragraph.  Notices personally delivered or delivered by private messenger
shall be deemed delivered when received at the address for such party designated
pursuant to this paragraph.  Notices sent by mail shall be deemed delivered on
the earlier of the third business day following deposit thereof with the United
States Postal Service by certified mail, or the delivery date shown on the
return receipt prepared in connection therewith.



                                    -30-

<PAGE>

          25.15     AUTHORITY.  If Tenant is a corporation or a partnership,
each individual executing this Lease on behalf of Tenant represents and warrants
that Tenant is a duly organized and validly existing entity, the persons signing
on behalf of Tenant, are duly authorized to execute and deliver this Lease on
behalf of Tenant and this Lease is binding upon Tenant in accordance with its
terms.  If Tenant is a corporation, Tenant shall, within thirty (30) days after
execution of this Lease, deliver to Landlord a certified copy of a resolution of
the board of directors of said corporation authorizing or ratifying the
execution of this Lease.

          25.16     LEASE GUARANTY.  (Deleted)

          25.17     BROKERS.  Tenant warrants and represents to Landlord that in
the negotiating or making of this Lease neither Tenant nor anyone acting on its
behalf has dealt with any real estate broker or finder who might be entitled to
a fee or commission for this Lease.  Tenant agrees to indemnify and hold
Landlord harmless from any claim or claims, including costs, expenses and
attorney's fees incurred by Landlord asserted by any other broker or finder for
a fee or commission based upon any dealings with or statements made by Tenant or
its agents, employees or representatives.

          25.18     RESERVED RIGHTS.  Landlord retains and shall have the rights
set forth below, exercisable without notice and without liability to Tenant for
damage or injury to property, person or business and without effecting an
eviction, constructive or actual, or disturbance of Tenant's use or possession
of the Premises or giving rise to any claim for set-off or abatement of Rent, to
reduce, increase, enclose or otherwise change at any time and from time to time
the size, number, location, lay-out and nature of the common areas and
facilities and other tenancies and premises in the Project and to create
additional rentable areas through use or enclosure of common areas, provided
that the foregoing shall not materially restrict or otherwise impair Tenant's
access to, use or occupancy of the Premises.

          25.19     OPTION TO EXTEND.  Landlord hereby grants Tenant with one
(1) Option to Extend the Term of this Lease for a period of five (5) years at
the then Fair Market Value for Bishop Ranch. In order to exercise this Option to
Extend, Tenant shall provide Landlord with nine (9) months' prior written notice
indicating their desire to exercise this Option to Extend.  In the event Tenant
fails to provide Landlord with written notice within the aforementioned time
frame, then Tenant shall be deemed to have waived its rights to this Option to
Extend.


                                    -31-

<PAGE>

     Landlord and Tenant have executed this Lease on the date and year set forth
at the beginning of this Lease.


Landlord:                          Tenant:

ANNABEL INVESTMENT COMPANY,        SUPERGEN, INC.
a California partnership



By:  /s/ Judith K. Martin           By:  /s/ Dr. Joseph Rubinfeld
    ---------------------------        --------------------------------
                                        Authorized Agent

                                    -32-

<PAGE>


                                 SITE PLAN

                            EXHIBIT A - Page 1
                            ------------------

                             BISHOP RANCH 12
                            TWO ANNABEL LANE
                           SAN RAMON, CA 94583


<PAGE>

                       TYPICAL SECOND FLOOR PLAN

                          EXHIBIT A - Page 2
                          ------------------

                        BISHOP RANCH 12 BLDG. B
                             SUITE 220
                           SECOND FLOOR
                            9,247 RSF


<PAGE>


                                    EXHIBIT B

                        ATTACHED TO AND FORMING A PART OF 
                                 LEASE AGREEMENT
                          DATED AS OF OCTOBER 14, 1996
                                    BETWEEN 

                               ANNABEL INVESTMENT 
                              COMPANY, AS LANDLORD,
                                      AND 
                                 SUPERGEN, INC.,
                                   AS TENANT
                                   ("LEASE")



                                   WORK LETTER


     1.   SUITE  IMPROVEMENTS.  Landlord shall construct and install in the
Premises the improvements and fixtures provided for in this Construction Rider
("Suite Improvements").

          1.1  PLANS.  With reasonable diligence after the execution of the
Lease, Landlord will cause the space planner for the Premises (the "Space
Planner") to prepare and deliver to Tenant detailed plans and specifications
sufficient to permit the construction of the Suite Improvements by Landlord
("Construction Documents") which describes the improvements to be made to the
Premises beyond the "Building Shell" utilizing "Building Standard Materials" (as
such terms are described in the attached Schedule I.) Tenant will approve said
Construction Documents on or before November 1, 1996.

          1.2  CONSTRUCTION.  Upon approval by Tenant of the Final Construction
Documents, Landlord shall proceed with reasonable diligence to cause the Suite
Improvements to be "Substantially Completed" on or prior to the Scheduled
Commencement Date.  The Suite Improvements shall be deemed to be "Substantially
Completed" when they have been completed in accordance with the Final
Construction Documents except for finishing details, minor omissions,
decorations and mechanical adjustments of the type normally found on an
architectural "punch list".  (The definition of Substantially Completed shall
also define the terms "Substantial Completion" and "Substantially Complete.")

          1.3  COST OF SUITE IMPROVEMENTS. See Section 1 of Building Lease
entitled PREMISES.

         1.4   TENANT DELAYS.  Tenant shall be responsible for, and shall pay to
Landlord, any and all reasonable costs and expenses incurred by Landlord in
connection with any delay in the commencement or completion of any Suite
Improvements and any increase in the cost of Suite Improvements (whether
Building Standard or Above-Standard) caused by (i) Tenant's failure to approve
the Construction Documents by November 1, 1996, (conditioned upon Tenant's
receipt of Final Construction Drawings acceptable to Tenant by October 26,
1996), (ii) Tenant's requesting more than one revision to the Construction
Documents after Tenant's final approval, (iii) Above-Standard Suite Improvements
requested by Tenant, (iv) any changes or modifications in the work requested by
Tenant following approval of the Final Construction Documents, or (v) any other
delay requested or caused by Tenant (collectively, "Tenant Delays"). 
Notwithstanding the foregoing, no 




<PAGE>

Tenant Delay shall be deemed to have occurred unless and until Landlord gives 
written notice to Tenant specifying the action, inaction or occurrence 
constituting the Tenant Delay and the number of days of such Tenant Delay 
("Tenant Delay Notice").  Each Tenant Delay day will result in one (1) 
Scheduled Commencement Adjustment Day.

     2.   COMMENCEMENT OF TERM.  Upon Substantial Completion of the Suite
improvements, Landlord shall deliver possession of the Premises to Tenant.  The
Commencement Date will be the date after the earlier of Substantial Completion
of the Suite Improvements or the date Landlord would have Substantially
Completed the Premises and tendered the Premises to Tenant if Substantial
Completion had not been delayed by the number of days specified in any and all
Tenant Delay Notices given by Landlord, as described in Paragraph 1.4.

     3.   ACCESS TO PREMISES.  Landlord, at its discretion, may allow Tenant or
Tenant's Representatives to enter the Premises prior to the Commencement Date to
permit Tenant to make the Premises ready for its use and occupancy; provided,
however, that prior to such entry, Tenant shall provide evidence reasonably
satisfactory to Landlord that Tenant's insurance, as described in Paragraph 12
of the Lease, shall be in effect as of the time of such entry.  Such permission
may be revoked at any time upon twenty-four (24) hours notice, and Tenant or its
Representatives shall not interfere with Landlord or Landlord's contractor in
completing the Building or the Suite Improvements.  Tenant agrees that Landlord
shall not be liable in any way for any injury, loss or damage which may occur to
any of Tenant's property placed upon or installed in the Premises prior to the
Commencement Date, the same being at Tenant's sole risk, and Tenant shall be
liable for all injury, loss or damage to persons or property arising as a result
of such entry of the Premises by Tenant or its Representatives.

     4.   OWNERSHIP OF SUITE IMPROVEMENTS.  All Suite Improvements, whether
Building Standard or Above-Standard, and whether installed by Landlord or
Tenant, shall become a part of the Premises, shall be the Property of Landlord
and, unless Landlord elects otherwise as provided in the Lease, shall be
surrendered by Tenant with the Premises, without any compensation to Tenant, at
the expiration or termination of the Lease.



                                    -2-

<PAGE>

                             SCHEDULE 1 TO EXHIBIT B

                                 BUILDING SHELL

*    All core areas, elevator lobbies and restrooms complete.

*    Main HVAC loop in place ready to receive mixing boxes for zoning.

*    Main fire sprinkler risers and grid in place ready for drop down.

*    All perimeter walls sheetrocked and ready for finish.

*    Upper floors covered with 3-1/2 inch concrete.

*    Electrical service to closets on floor.

*    Telephone outlet/conduit to closets on floor.


                           BUILDING STANDARD MATERIALS

ELECTRICAL

*    Day Bright 277 light fixtures with energy conserving ballasts and lamps;
     per Title 24 requirements.

*    Double switching in individual offices.

*    One duplex 110 receptacle at each work station.

*    One telephone outlet at each work station.

HVAC

*    One zone per 800 usable square feet.

*    Individual pneumatic thermostats per 800 usable square feet.

FIRE SPRINKLERS

     One 165 degree rate, semi-recessed sprinkler head per 144 usable square
     feet.


                                    -3-

<PAGE>

PARTITIONS AND DOORS

*    5/8-inch drywall on 2-1/2 inch steel studs with smooth finish.

*    Solid core oak doors 36" x 96".

*    Aluminum door jambs.

*    Schlage door latches or equal.

PAINT

*    Kelly Moore or equal.

RATED CEILING ASSEMBLY

*    USG: Aurora Reveal Tile.

CARPET, TILE AND BASE

*    Carpet: 38 oz.  Design Weave.

*    Armstrong Imperial Modern Excelon Tile or equal.

*    3/8 inch nylon composition pad.

*    4 inch rubber top set base or equal.

WINDOW COVERING

*    Mini Blinds.


                                    -4-

<PAGE>







                             EXHIBIT C - SPACE PLAN





                                 TO BE PROVIDED




<PAGE>

                                    EXHIBIT D

                              RULES AND REGULATIONS


     1.   No sign, placard, picture, advertisement, name or notice shall be
inscribed, displayed, printed, affixed or otherwise displayed by Tenant on or to
any part of the outside or inside of the Building or the Premises without the
prior written consent of Landlord and Landlord shall have the right to remove
any such sign, placard, picture, advertisement, name or notice without notice to
and at the expense of Tenant.  All approved signs or lettering on doors shall be
printed, painted, affixed or inscribed at the expense of Tenant by a person
approved by Landlord.  Tenant shall not place anything or allow anything to be
placed near the glass of any window, door, partition or wall which may appear
unsightly from outside the Premises; provided, however that Tenant may request
Landlord to furnish and install a building standard window covering at all
exterior windows at Tenant's cost.  Tenant shall not install any radio or
television antenna, loud speaker, or other device on or about the roof area or
exterior walls of the Building.

     2.   The sidewalks, halls, passages, exits, entrances, elevators and
stairways shall not be obstructed by Tenant or used by it for any purpose other
than for ingress to and egress from the Premises.  The halls, passages, exits,
entrances, elevators, stairways, balconies and roof are not for the use of the
general public and Landlord shall in all cases retain the right to control and
prevent access thereto by all persons whose presence in the judgment of the
Landlord shall be prejudicial to the safety, character, reputation and interests
of the Building and its tenants, provided that nothing herein contained shall be
construed to prevent such access to the common areas by persons with whom Tenant
normally deals in the ordinary course of its business unless such persons are
engaged in illegal activities.  In no event may Tenant go upon the roof of the
Building.

     3.   Landlord will furnish Tenant with _______ keys to the Premises, free
of charge.  Additional keys shall be obtained only from Landlord and Landlord
may make a reasonable charge for such additional keys.  No additional locking
devices shall be installed in the Premises by Tenant, nor shall any locking
devices be changed or altered in any respect without the prior written consent
of Landlord.  All locks installed in the Premises excluding Tenant's vaults and
safes, or special security areas (which shall be designated by Tenant in a
written notice to Landlord), shall be keyed to the Building master key system. 
Landlord may make reasonable charge for any additional lock or any bolt
(including labor) installed on any door of the Premises.  Tenant, upon the
termination of its tenancy, shall deliver to Landlord all keys to doors in the
Premises.

     4.   The toilet rooms, urinals, wash bowls and other apparatus shall not be
used for any purpose other than that for which they were constructed and no
foreign substance of any kind whatsoever shall be deposited therein and Tenant
shall bear the expense of any breakage, stoppage or damage resulting from its
violation of this rule.

     5.   Tenant shall not overload the floor of the Premises or mark, drive
nails, screw or drill into the partitions, woodwork or plaster or in any way
deface the Premises or any part thereof, except 



<PAGE>

to hang pictures or whiteboards. No boring, cutting or stringing of wires or 
laying of linoleum or other similar floor coverings or installation of 
wallpaper or paint shall be permitted except with the prior written consent 
of the Landlord and as the Landlord may direct.

     6.   Tenant may use the freight elevators in accordance with such
reasonable scheduling as Landlord shall deem appropriate. Tenant shall schedule
with Landlord, by written notice given no less than forty-eight (48) hours in
advance, its move into or out of the Building which moving shall occur after
5:00 p.m. or on weekend days if required by Landlord; and Tenant shall reimburse
Landlord upon demand for any additional security or other charges incurred by
Landlord as a consequence of such moving.  The persons employed by Tenant to
move equipment or other items in or out of the Building must be acceptable to
Landlord.  The floors, corners and walls of elevators and corridors used for
moving of equipment or other items in or out of the Project must be adequately
covered, padded and protected and, Landlord may provide such padding and
protection at Tenant's expense if Landlord determines that such measures
undertaken by Tenant or Tenant's movers are inadequate. Landlord shall have the
right to prescribe the weight, size and position of all safes and other heavy
equipment or furnishings brought into the Building and also the times and manner
of moving the same in or out of the Building.  Safes or other heavy objects
shall, if considered necessary by Landlord, stand on wood strips of such
thickness as is necessary to properly distribute the weight. Landlord will not
be responsible for loss of or damage to any such safe or property from any cause
and all damage done to the Building by moving or maintaining any such safe or
other property shall be repaired at the expense of Tenant.  There shall not be
used in any space, or in the public halls of the Building, either by any Tenant
or others, any hand trucks except those equipped with rubber tires and side
guards.

     7.   Tenant shall not employ any person or persons other than the janitor
of Landlord for the purpose of cleaning the Premises unless otherwise agreed to
by Landlord in writing.  Except with the written consent of Landlord, no person
or persons other than those approved by Landlord shall be permitted to enter the
Building for the purpose of cleaning the same.  Tenant shall not cause any
unnecessary labor by reason of Tenant's carelessness or indifference in the
preservation of good order and cleanliness. Landlord shall in no way be
responsible to any Tenant for any loss of property on the Premises, however
occurring, or for any damage done to the effects of Tenant by the janitor or any
other employee or any other person.  Janitor service will not be furnished on
nights when rooms are occupied after 9:30 p.m.  Window cleaning shall be done
only by Landlord.

     8.   Tenant shall not use or keep in the Premises or the Building any
kerosene, gasoline or flammable, combustible or noxious fluid or material, or
use any method of heating or air conditioning other than that supplied by
Landlord.  Tenant shall not use, keep or permit or suffer the Premises to be
occupied or used in a manner offensive or objectionable to the Landlord or other
occupants of the Building by reason of noise, odors and/or vibrations, or
interfere in any way with other tenants or those having business therein, nor
shall any animals or birds be brought in or kept in or about the Premises or the
Building.  Tenant shall not make or permit to be made any unseemly or disturbing
noises or disturb or interfere with occupants of this or neighboring Buildings
or premises or those having business with them whether by the use of any musical
instrument, radio, phonograph, unusual noise, or in any other way.



                                    -2-

<PAGE>

     9.   The Premises shall not be used for the storage of merchandise except
as such storage may be incidental to the use of the Premises for general office
purposes.  Tenant shall not occupy or permit any portion of the Premises to be
occupied for the manufacture or sale of liquor, narcotics, or tobacco in any
form. The Premises shall not be used for lodging or sleeping or for any illegal
purposes.  No cooking shall be done or permitted by Tenant on the Premises,
except that use by Tenant of Underwriters' Laboratory approved portable
equipment for brewing coffee, tea and similar beverages and of microwave ovens
approved by Landlord shall be permitted provided that such use is in accordance
with all applicable federal, state and local laws, codes, ordinances, rules and
regulations.

     10.  Landlord will direct electricians as to where and how telephone wires
and any other cables or wires are to be installed. No boring or cutting for
cables or wires will be allowed without the consent of Landlord.  The location
of telephones, call boxes and other office equipment affixed to the Premises
shall be subject to the approval of Landlord.

     11.  Tenant shall not lay linoleum, tile, carpet or other similar floor
covering so that the same shall be affixed to the floor of the Premises in any
manner except as approved by the Landlord.  Tenant shall bear the expense of
repairing any damage resulting from a violation of this rule or removal of any
floor covering.

     12.  No furniture, packages, supplies, equipment or merchandise will be
received in the Building or carried up or down in the elevators, except between
such hours and in such elevators as shall be designated by Landlord.  In its
use of such, Tenant shall not obstruct or permit the obstruction of walkways,
ingress and egress to the Building and tenant spaces and at no time shall Tenant
park vehicles which will create traffic and safety hazards or create other
obstructions.

     13.  On Saturdays, Sundays and legal holidays all day, and on other days
between the hours of 7:00 p.m.  and 7:00 a.m.  the following day, access to the
Building or to the halls, corridors, elevators, or stairways in the Building, or
to the Premises may be refused unless the person seeking access is known to the
person or employee of the Building in charge and has a pass or is properly
identified.  Landlord shall in no case be liable for damages for any error with
regard to the admission to or exclusion from the Building of any person.  Tenant
assumes all responsibility for protecting its Premises from theft, robbery and
pilferage.  In case of invasion, mob, riot, public excitement, or other
commotion, the Landlord reserves the right to prevent access to the Building
during the continuance of the same by closing the doors or otherwise, for the
safety of the Tenants and protection of property in the Building and the
Building.  Landlord reserves the right to close and keep locked all entrance and
exit doors of the Building on Saturdays, Sundays and legal holidays all day, and
on other days between the hours of 7:00 p.m.  and 7:00 a.m.  and during such
further hours as Landlord may deem advisable for the adequate protection of said
Building and the property of its tenants, and to implement such additional
security measures as Landlord deems appropriate for such purposes.  The cost of
such additional security measures, as reasonably allocated by Landlord to
Tenant, shall be reimbursed by Tenant within thirty (30) days after receipt of
Landlord's demand therefor.


                                    -3-

<PAGE>

     14.  Tenant shall see that the doors of the Premises are closed and 
securely locked before leaving the Building and must observe strict care and 
caution that all water faucets, water apparatus and utilities are entirely 
shut off before Tenant or Tenant's employees leave the Building, and that all 
electricity shall likewise be reasonably shut off, so as to prevent waste or 
damage and for any default or carelessness Tenant shall make good all 
injuries sustained by other tenants or occupants of the Building or Landlord. 
 On multiple-tenancy floors, all tenants shall keep the doors to the Building 
corridors closed at all times except for ingress and egress, and all tenants 
shall at all times comply with any rules and orders of the fire department 
with respect to ingress and egress.

     15.  Landlord reserves the right to exclude or expel from the Building 
any person who, in the judgment of Landlord, is intoxicated or under the 
influence of liquor or drugs, or who shall in any manner do any act in 
violation of any of the rules and regulations of the Building.

     16.  Landlord shall attend to the requests of Tenant after notice 
thereof from Tenant by telephone, in writing or in person at the Office of 
the Landlord. Employees of Landlord shall not perform any work or do anything 
outside of their regular duties unless under special instructions from the 
Landlord.

     17.  No vending machine or machines of any description shall be 
installed, maintained or operated upon the Premises without the written 
consent of the Landlord.

     18.  Tenant agrees that it shall comply with all fire and security 
regulations that may be issued from time-to-time by Landlord and Tenant also 
shall provide Landlord with the name of a designated responsible employee to 
represent Tenant in all matters pertaining to such fire or security 
regulations.

     19.  Landlord may waive any one or more of these Rules and Regulations for
the benefit of any particular tenant or tenants, but no such waiver by Landlord
shall be construed as a waiver of those Rules and Regulations in favor of any
other tenant or tenants, nor prevent Landlord from thereafter enforcing any such
Rules and Regulations against any or all of the tenants of the Project.

     20.  Canvassing, soliciting, peddling or distribution of handbills or other
written material in the Building and Project is prohibited and Tenant shall
cooperate to prevent same.

     21.  Landlord reserves the right to (i) select the name of the Project and
Building and to make such change or changes of name, street address or suite
numbers as it may deem appropriate from time to time, (ii) grant to anyone the
exclusive right to conduct any business or render any service in or to the
Building and its tenants, provided such exclusive right shall not operate to
require Tenant to use or patronize such business or service or to exclude Tenant
from its use of the Premises expressly permitted in the Lease, and (iii) reduce,
increase, enclose or otherwise change at any time and from time to time the
size, number, location, layout and nature of the common areas and facilities and
other tenancies and premises in the Project and to create additional rentable
areas through use or enclosure of common areas.  Tenant shall not refer to the
Project by any name other than the name as selected by Landlord (as same may be
changed from time to time), or the postal address, approved by 



                                    -4-

<PAGE>

the United States Post Office. Without the written consent of Landlord, 
Tenant shall not use the name of the Building or Bishop Ranch Business Park 
in connection with or in promoting or advertising the business of Tenant or 
in any respect except as Tenant's address.

     22.  Tenant shall store all its trash and garbage within the Premises until
removal of same to such location in the Project as may be designated from time
to time by Landlord.  No material shall be placed in the Project trash boxes or
receptacle if such material is of such nature that it may not be disposed of in
the ordinary and customary manner of removing and disposing of trash and garbage
in the City of San Ramon without being in violation of any law or ordinance
governing such disposal.

     23.  Landlord shall furnish heating and air conditioning during the hours
of 7:00 a.m. and 7:00 p.m., Monday through Friday, except for holidays.  In the
event Tenant requires heating and air conditioning during off hours, Saturdays,
Sundays or holidays, Landlord shall on notice provide such services at the rate
established by Landlord from time-to-time.  Landlord shall have the right to
control and operate the public portions of the Building and the public
facilities, and heating and air conditioning, as well as facilities furnished
for the common use of the Tenants, in such manner as it deems best for the
benefit of the Tenants generally.

     24.  The directory of the Building will be provided for the display of the
name and location of tenants and Landlord reserves the right to exclude any
other names therefrom.  Any additional name that Tenant shall desire to place
upon the directory must first be approved by Landlord and, if so approved, a
charge will be made for each such name.

     25.  Except with the prior written consent of Landlord, Tenant shall not
sell, or permit the sale from the Premises of, or use or permit the use of any
sidewalk or common area adjacent to the Premises for the sale of newspapers,
magazines, periodicals, theater tickets or any other goods, merchandise or
service, nor shall Tenant carry on, or permit or allow any employee or other
person to carry on, business in or from the Premises for the service or
accommodation of occupants of any other portion of the Building, nor shall the
Premises be used for manufacturing of any kind, or for any business or activity
other than that specifically provided for in Tenant's lease.

     26.  The word "Tenant" occurring in these Rules and Regulations shall mean
Tenant and Tenant's Representatives.  The word "Landlord" occurring in these
Rules and Regulations shall mean Landlord's assigns, agents, clerks, employees
and visitors.


ACKNOWLEDGED AND ACCEPTED:

Landlord:                           Tenant:

By:  /s/ Judith K. Martin           By:  /s/ Dr. Joseph Rubinfeld
   ------------------------------      ----------------------------------

Date: October 14, 1996              Date: October 10, 1996
     ----------------------------        --------------------------------




                                    -5-

<PAGE>

                                    EXHIBIT E

                            JANITORIAL SPECIFICATIONS

     The following specific janitorial services will be provided in accordance
with provisions of Paragraph 7.1, Landlord's Obligations:

OFFICE AREAS (DAILY)

1.   Empty all waste baskets and disposal cans, if liners used, replace as
     necessary.
2.   Spot dust desks, chairs, file cabinets, counters and furniture.
3.   Spot vacuum all carpets and walk-off mats; spot as necessary.
4.   Sweep all hard surface floors with treated dust mop.

OFFICE AREAS (WEEKLY)

1.   Vacuum carpets completely, including around base boards, etc.
2.   Perform low dusting of furniture.
3.   Dust window sills and ledges.

OFFICE AREAS (QUARTERLY)

1.   Perform all high dusting of doors, sashes, moldings, etc.
2.   Dust venetian blinds as needed.

OFFICE AREA CORRIDORS AND LOBBIES (DAILY SERVICE)

1.   Vacuum carpets and dust mop any hard floors.
2.   Spot clean carpets of all spillage.
3.   Clean all thresholds.

OFFICE AREA CORRIDORS AND LOBBIES (WEEKLY)

1.   Perform all high dusting of doors, sashes, moldings, etc.
2.   Vacuum and clean all ceiling vents.
3.   Polish any metal railings, placards, etc.

STAIRWAYS (DAILY)

1.   Sweep all hard surface steps.
2.   Dust banisters.



<PAGE>


STAIRWAYS (WEEKLY)

1.   Sweep all hard surfaces.
2.   Spot mop all spills as needed.

RESTROOMS COMMON AREA (DAILY SERVICE)

1.   Empty all waste containers and replace liners as needed.
2.   Clean all metal, mirrors, and fixtures.
3.   Sinks, toilet bowls and urinals are to be kept free of scale.
4.   Clean all lavatory fixtures using disinfectant cleaners.
5.   Wash and disinfect underside and tops of toilet seats.
6.   Wipe down walls around urinals.
7.   Refill soap, towel, and tissue dispensers.
8.   Wet mop tile floors with disinfectant solution.
9.   Refill sanitary napkin machines as necessary.

RESTROOMS COMMON AREA (WEEKLY)

1.   Perform high dusting and vacuum vents.
2.   Use germicidal solution in urinal traps, lavatory traps, and floor drains.

RESTROOMS COMMON AREA (MONTHLY)

1.   Scrub floors with power machine.
2.   Wash down all ceramic tile and toilet compartments.

ELEVATORS (DAILY)

1.   Vacuum floors.
2.   Clean thresholds.
3.   Spot walls and polish surfaces.

GENERAL

All glass entry doors to offices, corridors, or lunch rooms are to
be cleaned as necessary.


                                    -2-

<PAGE>

                                    EXHIBIT F

                 DOOR SIGN, DIRECTORY STRIP AND MAIL BOX REQUEST

1.   I, the undersigned, hereby authorize Landlord to order one door sign of 
     (    ) wood, (    ) vinyl, (    ) chrome.  The business name on it shall
     be:

           SuperGen, Inc.
     _________________________________________________________________________


2.   The directory strip shall read:

           SuperGen, Inc.
     _________________________________________________________________________


3.   The mail box strip shall read:

           SuperGen, Inc.
     _________________________________________________________________________


             /s/  Dr. Joseph Rubinfeld                 October 9, 1996

     _________________________________________________________________________
               Signature                                   Date


     Street Address:   Two Annabel Lane
                    ----------------------------------------------------------
     Suite Number:     220
                    ----------------------------------------------------------

     Complex:          Bishop Ranch 12, Building B
                    ----------------------------------------------------------


<PAGE>

                                    EXHIBIT G

                              COMMENCEMENT OF LEASE


     It is hereby agreed to that (a) the "Commencement Date" under that certain
Lease dated _____________________ by and between ANNABEL INVESTMENT COMPANY as
Landlord and SUPERGEN, INC. as Tenant, covering Premises located at TWO ANNABEL
LANE, SUITE 220, is ___________, 19__, (b) the "Expiration Date" thereof is 5:00
P.M. on ___________, 19__, and (c) Landlord has completed all of its
construction obligations under the Work Letter.





ACKNOWLEDGED AND ACCEPTED:


Landlord:                          Tenant:


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

Date:                              Date:                                
     ---------------------------        -------------------------------------





                                    -2-



<PAGE>
                                                                    EXHIBIT 23.1
 
               CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS
 
We consent to the incorporation by reference in Form S-8 (Registration No.
333-07295) of our report dated January 15, 1997, except as to the third
paragraph of Note 2 as to which the date is January 24, 1997, with respect to
the consolidated financial statements and schedule of SuperGen, Inc. included in
the Annual Report on Form 10-K for the year ended December 31, 1996.
 
                                          ERNST & YOUNG LLP
 
Palo Alto, California
March 25, 1997

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM SUPERGEN,
INC., DECEMBER 31, 1996 CONSOLIDATED FINANCIAL STATEMENTS AND IS QUALIFIED IN
ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-START>                             JAN-01-1996
<PERIOD-END>                               DEC-31-1996
<CASH>                                      13,914,863
<SECURITIES>                                         0
<RECEIVABLES>                                  120,440
<ALLOWANCES>                                         0
<INVENTORY>                                  1,573,951
<CURRENT-ASSETS>                            16,149,630
<PP&E>                                         654,983
<DEPRECIATION>                                 243,500
<TOTAL-ASSETS>                              17,873,416
<CURRENT-LIABILITIES>                        2,166,578
<BONDS>                                              0
                                0
                                          0
<COMMON>                                    40,026,551
<OTHER-SE>                                           0
<TOTAL-LIABILITY-AND-EQUITY>                17,873,416
<SALES>                                        225,962
<TOTAL-REVENUES>                               263,677
<CGS>                                          282,777
<TOTAL-COSTS>                                  282,277
<OTHER-EXPENSES>                             9,488,037
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                              8,757,635
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                          8,757,635
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                               (8,757,635)
<EPS-PRIMARY>                                    (.55)
<EPS-DILUTED>                                        0
        

</TABLE>


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