VICAL INC
10-K, 1999-03-30
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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<PAGE>

                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION

                              WASHINGTON, DC 20549

                                    FORM 10-K

/ X /  Annual Report pursuant to Section 13 or 15(d) of the Securities 
 ---   Exchange Act of 1934.

For the fiscal year ended December 31, 1998, 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: 0-21088
                        --------

                               VICAL INCORPORATED
             (Exact name of registrant as specified in its charter)

              DELAWARE                                    93-0948554
  (State or other jurisdiction of              (IRS Employer Identification No.)
    incorporation or organization)

             9373 TOWNE CENTRE DRIVE, SUITE 100, SAN DIEGO, CA 92121
                    Address of principal executive offices

                                 (619) 453-9900
                Registrant's telephone number including area code

<TABLE>
<S>                                                           <C>
Securities registered pursuant to Section 12(b) of the Act:   None

Securities registered pursuant to Section 12(g) of the Act:   Common Stock, Par Value $0.01
                                                              Preferred Stock Purchase Rights, Par Value $0.01
                                                                       (Title of Class)
</TABLE>

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. [X]

The aggregate market value of the Common Stock held by non-affiliates of the 
registrant, based upon the last sale price of the Common Stock reported on 
the National Association of Securities Dealers Automated Quotation National 
Market System on March 15, 1999, was $166,432,000.

The number of shares of Common Stock outstanding as of March 15, 1999, was 
16,190,313.

                                       1
<PAGE>

                       DOCUMENTS INCORPORATED BY REFERENCE

                        (To the Extent Indicated Herein)

Registrant's Proxy Statement to be filed with the Securities and Exchange 
Commission in connection with the solicitation of proxies for the 
Registrant's 1999 Annual Meeting of Stockholders to be held on May 27, 1999, 
is incorporated by reference in Part III, Items 10 (as to directors), 11, 12 
and 13 of this Form 10-K.








                                       2
<PAGE>

                                     PART I

ITEM 1.  BUSINESS

OVERVIEW

         Vical is developing gene-based pharmaceutical products for human 
therapy. Our patented naked DNA gene delivery technology and proprietary 
lipids are designed to deliver selected genes into some cells in the body. 
These genes have been shown in clinical trials to cause the cells to produce 
desired proteins which may prevent or treat infectious and malignant diseases 
and other disorders. Vical is developing cancer product candidates internally 
while developing vaccines for infectious diseases and gene-based delivery of 
therapeutic proteins for other disorders primarily in collaboration with 
corporate partners.

         The key discovery leading to Vical's proprietary direct gene 
transfer technology was that some muscle tissues can absorb genetic material 
directly and subsequently express a desired protein for periods ranging from 
weeks to several months. In addition, we are developing other technologies to 
deliver DNA directly into some non-muscle tissues, including the use of lipid 
molecules that facilitate direct absorption of DNA into cells. The active 
ingredients of products under development at Vical consist of highly 
purified, well-defined gene sequences produced by conventional fermentation 
processes.

         Our gene-based therapy approach may offer safer and more 
cost-effective treatments for many diseases as well as novel treatment 
alternatives for diseases that are currently poorly addressed. The broad 
applicability, ease of manufacturing and potential low cost of our gene-based 
approach may provide competitive advantages for commercialization.

         Some of the matters discussed in this Annual Report on Form 10-K are 
forward-looking statements that involve risks and uncertainties, including 
the timely and successful development of candidate products, receipt of 
necessary regulatory approvals and commercial acceptance of products, the 
attainment of patent protection for any of these products, the impact of 
competitive products and pricing and reimbursement policies, changing market 
conditions and the other risks detailed throughout this Form 10-K. Actual 
results may differ materially from those projected. These forward-looking 
statements represent our judgment as of the date of the filing of this Form 
10-K. We disclaim, however, any intent or obligation to update these 
forward-looking statements.

GENE TRANSFER TECHNOLOGY

         Gene transfer is an approach to the treatment and prevention of 
diseases in which genes are introduced into cells to direct the production of 
specific proteins needed to correct or control diseases. A typical human cell 
contains thousands of different proteins essential to cellular structure, 
growth and function. Proteins are produced by the cell according to a set of 
genetic instructions encoded by DNA, which contains all the information 
necessary to control the cell's biological processes.

         DNA is organized into segments called genes, with each gene 
containing the information required to produce a specific protein. Production 
of the protein encoded by a particular gene is known as gene expression. The 
improper expression of even a single gene can severely alter a cell's normal 
function, frequently resulting in a disease.

         Gene transfer approaches include the use of (1) cells genetically 
altered EX VIVO (outside the body) using viruses or other gene transfer 
methods, (2) viruses that have been genetically disabled so that they cannot 
reproduce and infect other cells and that are delivered IN VIVO to the 
patient, and (3) non-viral or synthetic formulations of DNA that are 
delivered IN VIVO to the patient. EX VIVO cell-based therapies are cumbersome 
and expensive relative to IN VIVO therapies since individual products must be 
designed and manufactured for each patient.

                                       3
<PAGE>

         Gene transfer product candidates in development rely primarily on IN 
VIVO delivery. IN VIVO approaches using viruses suffer several drawbacks that 
may limit their widespread usefulness, including adverse immune responses and 
inflammation that may inhibit the activity of the virus-based therapy and 
prevent repeated administration. In addition, viruses can induce permanent 
changes in the patient's genetic makeup, which may cause malignant 
transformation of cells leading to cancer. IN VIVO methods using non-viral 
DNA formulations may offer safer and more effective gene transfer.

         Vical has developed core technologies that allow the IN VIVO 
delivery of non-viral DNA formulations, or naked DNA. The discovery that led 
to Vical's naked DNA gene transfer approach was that some muscle tissues are 
able to directly absorb genetic material into cells and subsequently express 
the desired protein for periods ranging from weeks to several months. In 
addition, we have developed proprietary methods to allow the delivery of 
genes directly into some non-muscle tissues, including the use of lipid 
molecules that facilitate absorption into cells.

         Vical's naked DNA gene transfer approach involves the design and 
construction of plasmids, DNA segments whose ends are attached together to 
form a highly stable closed loop. These plasmids contain the gene encoding 
the protein of interest as well as short segments of DNA that control the 
rate and location of protein expression.

     The potential benefits of Vical's gene transfer technology may include:

     -   CONVENIENCE. Vical's gene-based drug therapy is intended to be directly
         administered like conventional pharmaceuticals.

     -   SAFETY. Vical's anticipated products will contain no viral components
         that may cause an unwanted immune response or infection.

     -   EASE OF MANUFACTURING. Vical's product candidates are manufactured
         using conventional fermentation techniques and standard purification
         procedures.

     -    COST-EFFECTIVENESS. Vical's gene transfer technology may prove more
     cost-effective than systems requiring EX VIVO manipulation of cells on a
     patient-by-patient basis. In some situations, administering DNA encoding a
     particular protein may be more cost-effective than administering the
     protein itself. This is because the DNA, once introduced into the body, is
     intended to stimulate the production of a therapeutic protein over a
     prolonged period of time.

CLINICAL TRIALS

         U.S. Food and Drug Administration ("FDA") approval is required prior 
to marketing a pharmaceutical product in the United States. To obtain this 
approval the FDA requires clinical trials to demonstrate the safety, 
efficacy, and potency of the product candidates. Clinical trials are the 
means by which experimental drugs or treatments are tested in humans. New 
therapies typically advance from laboratory (research) testing through animal 
(preclinical) testing and finally through several phases of clinical (human) 
testing. Upon successful completion of clinical trials, approval to market 
the therapy for a particular patient population may be requested from the FDA 
in the United States and/or its counterparts in other countries.

         Clinical trials are normally done in three phases. In Phase I, 
trials are conducted with a small number of patients or healthy volunteers to 
determine the safety profile, the pattern of drug distribution and metabolism 
and early evidence on effectiveness. In Phase II, trials are conducted with a 
larger group of patients afflicted with a target disease in order to 
determine preliminary efficacy, optimal dosages and expanded evidence of 
safety. In Phase III, large scale, multi-center, comparative trials are 
conducted with patients afflicted with a target disease in order to provide 
enough data for the statistical proof of safety, efficacy, and potency 
required by the FDA and other regulatory authorities. For life-threatening 
diseases, initial human testing generally is done in patients rather than 
healthy volunteers. Such studies may provide results traditionally obtained 
in Phase II trials. Such trials are referred to as "Phase I/II" trials.

                                       4
<PAGE>

CANCER PRODUCT DEVELOPMENT PROGRAMS

         Vical is developing cancer product candidates internally while 
developing vaccines for infectious diseases and gene-based delivery of 
therapeutic proteins for other disorders primarily in collaboration with 
corporate partners.

         CANCER

         Cancer is a group of diseases in which certain cells grow 
uncontrolled by the body's normal self-regulatory mechanisms. Traditional 
chemotherapy seeks to control cancer by killing rapidly dividing cells. 
However, a number of non-malignant cells in the body, such as intestinal 
epithelium and bone marrow cells, also rapidly divide and are highly 
susceptible to chemotherapy. Thus, doses sufficient to eradicate the cancer 
often cannot be administered without life-threatening side effects.

         A therapeutic approach that selectively kills tumor cells would be 
far superior to currently available therapies. One approach would be to 
generate a specific immune response targeting cancer cells without damaging 
other normal tissues. It is generally believed that the immune system is 
capable of selectively recognizing cancer cells as abnormal and destroying 
them. However, the vast majority of cancers arise spontaneously in patients 
with an otherwise normal immune system. This observation suggests that cancer 
cells somehow escape the normal immune defense mechanisms or that the 
cytotoxic T lymphocyte (CTL), or killer T-cell, response produced by cancer 
patients is not powerful enough to kill all of the abnormal cells. A variety 
of methods have been used to augment the immune response against tumor cells, 
including the systemic administration of natural immune-enhancing proteins 
such as interleukin 2 (IL-2), either alone or in combination with other 
agents. These methods have shown encouraging results in some patients with 
some tumor types but also cause serious side effects.

         Vical scientists are developing novel gene-based cancer 
immunotherapies to address the shortcomings, including adverse side effects 
of existing therapies. Vical is focusing on some types of cancer including 
melanoma, head and neck cancer, kidney cancer, prostate cancer and B-cell 
lymphoma.

Current U.S. market data for these cancers and Vical's product candidates are 
summarized below.

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------------------------
                            1998            1998              1998           INCREASE IN
   TYPE OF PRIMARY           NEW           CURRENT          ESTIMATED          DEATHS
        CANCER              CASES           CASES             DEATHS         1974-1994          PRODUCT CANDIDATE
- --------------------------------------------------------------------------------------------------------------------
<S>                        <C>           <C>               <C>              <C>               <C>
       Melanoma             41,600          476,000             7,300            79%           ALLOVECTIN 7 & GP100
- --------------------------------------------------------------------------------------------------------------------
     Head & Neck            41,400          342,000            12,300             6%               ALLOVECTIN 7
- --------------------------------------------------------------------------------------------------------------------
        Kidney              29,900          201,000            11,600            62%                 LEUVECTIN
- --------------------------------------------------------------------------------------------------------------------
       Prostate            184,500        1,000,000            39,200            82%                 LEUVECTIN
- --------------------------------------------------------------------------------------------------------------------
   B-cell Lymphoma          55,400          296,000            24,900            105%                  VAXID
- --------------------------------------------------------------------------------------------------------------------
</TABLE>

Sources: American Cancer Society, SEER Cancer Statistics

         MELANOMA. This is a skin cancer found predominantly in Caucasians, 
particularly fair-skinned individuals who have experienced repeated sunburn. 
If detected when the disease is still limited to one site (stage I and II) it 
usually can be treated successfully by surgery. If untreated, the disease 
spreads to the lymph glands, lungs, liver, brain and other organs. Stage III 
is defined as metastatic (spread) disease limited to one region and is 
treated with a combination of surgery and chemotherapy. Stage IV disease 
involves advanced regional or any distant tumors and it is usually treated 
with some combination of chemotherapy, radiotherapy, and surgery. The 
five-year survival of patients with stage III and stage IV disease is 60% and 
15%, respectively. In patients whose disease continues to progress after they 
have received all available treatments, the median survival is 6 to 8 months.

         HEAD AND NECK CANCER. This describes any of several localized tumors 
affecting the oral cavity, the pharynx or larynx. Head and neck cancers are 
found more frequently in men than in women, and most often in men over age 
40. Risk factors vary with the particular location, but can include use of 
tobacco and excessive consumption of alcohol.

                                       5
<PAGE>

         Most head and neck cancers are treated by surgical removal and/or 
localized radiation therapy, with widely ranging degrees of success depending 
on the number of tumors, their size, and their specific location. In advanced 
disease, standard treatment may be preceded by systemic chemotherapy to 
improve treatability, or followed by systemic chemotherapy to address 
remaining cancer cells, most often with a combination of agents. The 
five-year survival rate for head and neck cancer patients, if treated, varies 
from more than 90 percent for localized, accessible disease to less than 5 
percent for widespread malignancies not curable by surgery.

         KIDNEY CANCER. The most common type of kidney cancer, renal cell 
carcinoma, is more prevalent in males than females, predominantly in people 
over 35. The greatest single risk factor is cigarette smoking. Other risk 
factors include exposure to asbestos, cadmium, or gasoline, and the use of 
some pain medications containing phenacetin.

         Kidney cancer frequently spreads to adjacent tissues and ultimately 
to other internal organs, most often the lungs, bone, brain or liver. About 
30 percent of patients have metastatic disease when first diagnosed. 
Treatment of regional metastatic kidney cancer involves surgical removal of 
the affected kidney and surrounding tissue, frequently combined with 
radiation therapy to alleviate pain. The five-year survival rate for 
metastatic disease where surgery cannot be curative is less than 10 percent 
with very few treatment alternatives.

         PROSTATE CANCER. The most frequently diagnosed type of cancer, and 
second leading cause of cancer fatalities among men in the United States, is 
prostate cancer. African Americans are at significantly greater risk than 
Caucasians, and men over age 65 account for over 80 percent of all diagnoses.

         Early detection has been increasing the number of annual diagnoses 
and improving overall survival rates. Most patients are diagnosed while the 
disease is confined to the prostate gland, with a five-year survival rate of 
99 percent. If the disease is discovered after it spreads to connective 
tissue, lymph nodes, or other internal organs, survival rates decline. 
Treatment options include "watchful waiting" for older patients with no 
symptoms or with other more serious illnesses, radiation therapy, and 
surgical removal of the prostate gland and/or affected lymph nodes. Symptoms 
may also be relieved by hormone therapy or surgery.

         B-CELL LYMPHOMA. Non-Hodgkin's B-cell lymphoma is a disease in which 
cells in the lymph nodes or other lymphatic tissue grow abnormally. They 
divide too rapidly and grow without any order or control. Too much tissue is 
formed and tumors, usually cancerous, begin to grow. Low-grade non-Hodgkin's 
B-cell lymphoma is a less aggressive form of the disease. This disease is 
characterized by a slow growth rate and excellent initial response to current 
treatments; however, a regular pattern of relapse to a widespread, aggressive 
lymphoma occurs for which no curative therapy has been identified.

         CANCER PRODUCT CANDIDATES

         ALLOVECTIN-7 (MELANOMA AND HEAD AND NECK CANCER). We are developing 
a product candidate, ALLOVECTIN-7, for treatment of various solid tumors. 
ALLOVECTIN-7 is a DNA/lipid complex containing the gene encoding the HLA-B7 
antigen. ALLOVECTIN-7 is designed to be injected directly into a tumor, where 
malignant cells take it in and display the HLA-B7 antigen on their surface. 
This antigen alerts the immune system to the presence of foreign tissue, 
inducing the type of powerful immune response seen in organ transplant 
rejection.

         LEUVECTIN (KIDNEY AND PROSTATE CANCERS). Our second oncology product 
candidate, LEUVECTIN, is another DNA/lipid complex designed for direct 
injection into a tumor. LEUVECTIN contains the gene encoding IL-2. Systemic 
IL-2 protein therapy is approved as a treatment for kidney cancer and 
melanoma, but can cause severe side effects. We expect that LEUVECTIN, when 
injected into tumors, will cause the malignant cells to produce IL-2. Local 
expression of IL-2 may stimulate the patient's immune system to attack and 
destroy the tumor cells. Because LEUVECTIN delivers IL-2 locally, it may 
provide efficacy comparable to the protein treatment with fewer side effects.

         GP100 (MELANOMA). In collaboration with the National Cancer 
Institute, we are using an experimental DNA vaccine containing a gene which 
may cause cells at the injection site to produce a modified gp100 melanoma 
antigen (melanoma-related protein). The antigen is expected to trigger an 
immune response against melanoma tumor cells. In earlier studies, the 
National Cancer Institute tested a vaccine using peptides (portions of the 
modified antigen) in combination with IL-2 protein therapy. A DNA vaccine may 
be more generally applicable and may provide advantages in manufacturing and 
administration.

                                       6
<PAGE>

         VAXID (B-CELL LYMPHOMA). In collaboration with Stanford University 
Medical Center, we are developing a naked DNA vaccine, VAXID, against 
low-grade non-Hodgkin's B-cell lymphoma. VAXID contains a gene that encodes 
the patient-specific idiotype (characteristic feature) of cancerous B-cells. 
Preclinical studies showed that the injection into mice of a B-cell lymphoma 
idiotype DNA vaccine resulted in strong anti-idiotype immune responses and 
significant protection against tumor challenge. We believe that immunization 
of post-chemotherapy patients with VAXID could result in the elimination of 
residual disease and the prevention of the relapse of disease.

         CANCER CLINICAL TRIALS

         ALLOVECTIN-7 (MELANOMA). Ninety patients with advanced melanoma have 
received treatment with ALLOVECTIN-7 during two phase II clinical trials. 
Four (17%) of 23 evaluable patients with disease limited to the skin, lymph 
nodes, or lung achieved clinical responses. There were one complete response 
and three partial responses. Of the 73 evaluable patients in the two trials, 
19 patients (26%) appeared to derive clinical benefit from treatment. Current 
treatments for melanoma frequently result in grade 3 adverse events which 
require hospitalization and grade 4 events which are considered 
life-threatening. There were no grade 3 or 4 adverse events caused by 
ALLOVECTIN-7. We believe ALLOVECTIN-7's minimal side effects will provide a 
much safer and better tolerated treatment than available treatments. As a 
result of these promising data, additional studies are underway. Two studies 
are recruiting in 50 centers across the United States, one involving 
end-stage patients in a single-agent trial and one comparing dacarbazine (the 
only FDA approved chemotherapeutic agent for metastatic melanoma) to a 
combination of dacarbazine plus ALLOVECTIN-7. Positive results from either or 
both of these trials could allow us to apply to the FDA for approval to 
market the drug candidate.

         ALLOVECTIN-7 (HEAD AND NECK CANCER). In a phase I/II and an early 
phase II study in advanced or recurrent squamous cell cancer of the head and 
neck, 39 patients were treated. Of 32 evaluable patients, five (16%) 
responded, two of whom were complete responders and three of whom were 
partial responders. A multi-center phase II study is now ongoing.

         LEUVECTIN (KIDNEY CANCER). IL-2 is the only FDA approved drug for 
the treatment of metastatic kidney disease but its administration is 
associated with serious toxicity in the majority of patients. The goal of the 
LEUVECTIN kidney cancer program is to match IL-2's efficacy without major 
adverse events.

         Initial results from the phase I/II trial in kidney cancer suggested 
that LEUVECTIN had a favorable risk-benefit profile in these patients. To 
date there has been only one grade 3 adverse event and no grade 4 adverse 
events caused by LEUVECTIN out of over 130 patients treated. A multi-center 
study is ongoing.

         LEUVECTIN (PROSTATE CANCER). We released initial data in 1998 from a 
Phase I/II pilot trial in patients with prostate cancer. The data indicated 
that the treatment was safe and well-tolerated, that it may stimulate an 
immune response against the disease, and that it may result in an increased 
time to disease progression. On the basis of these data, we intend to pursue 
further clinical development.

         GP100 (MELANOMA). The National Cancer Institute published data from 
a previous clinical trial indicating a 42% response rate in end-stage 
melanoma patients after treatment with systemic IL-2 and the gp100 protein. 
This study is being repeated (Phase I/II) with a gp100 naked DNA vaccine from 
Vical.

         VAXID (B-CELL LYMPHOMA). An initial phase I/II study is now ongoing 
in collaboration with Stanford University Medical Center.

INFECTIOUS DISEASE VACCINE DEVELOPMENT PROGRAMS

         According to the World Health Organization, of a global total of 
52.2 million deaths in 1997, 17.3 million were due to infectious and 
parasitic diseases making it the leading category. Most deaths from 
infectious diseases were caused by acute lower respiratory infections, 
tuberculosis, diarrhea, human immunodeficiency virus (HIV) and malaria.

         NAKED DNA VACCINE TECHNOLOGY

         Vical's naked DNA technology may address two deficiencies of 
traditional preventive vaccine approaches: (1) the inability to predict the 
random changes in the strains of various infectious agents and (2) the need 
for safe formulations (adjuvants) that boost an antibody response or that 
cause sufficient killer T-cell responses. We believe our potential vaccine 
products should be simpler to manufacture than vaccines that are made using 
cumbersome and labor-intensive techniques involving difficult tissue culture 
procedures and live viruses.

                                       7
<PAGE>

         Vical scientists have shown in animal experiments that the 
intramuscular injection of a plasmid encoding a protein common to all strains 
of the influenza virus stimulates both antibody and killer T-cell responses 
against the virus itself and the virus-infected cells. The immune response is 
potent, specific and requires no adjuvant formulation. For over a year 
following vaccination, treated animals demonstrated higher survival rates 
than untreated control animals when challenged with various strains of 
inhaled influenza virus. This observed cross-strain protection, if 
reproducible in humans, will offer a key advantage compared with conventional 
vaccines. Thus, Vical's direct gene transfer technology may be universal, not 
requiring frequent re-design or product modification for each new viral 
strain.

         Only a few years ago, DNA vaccines were an unproven novelty with 
limited acceptance in the scientific community. Today, more than 700 
scientific publications have documented the efficacy of DNA vaccines in 
providing protective immunity against viruses, bacteria and parasites in 
dozens of species from fish to primates. Additional studies have extended 
these findings to other models of infectious diseases for which there are no 
approved vaccines, such as HIV, herpes and malaria.

         NAKED DNA VACCINE LICENSES

         Vical has licensed its naked DNA gene delivery technology to Merck 
for a total of seven preventive vaccines: influenza, HIV, herpes, hepatitis B 
virus (HBV), hepatitis C virus (HCV), human papilloma virus (HPV) and 
tuberculosis and three therapeutic vaccines: HPV, HIV and HBV. We also have a 
license and option agreement with Pasteur Merieux Connaught (PMC) for a total 
of six preventive vaccines: cytomegalovirus (CMV), respiratory syncytial 
virus (RSV), Lyme disease, helicobacter pylori, malaria and herpes zoster. 
Vical also has an option agreement with Merial, the joint venture between 
Merck's animal health business and Rhone Merieux, for veterinary vaccines. 
Because of the large-scale development programs, manufacturing capacity and 
distribution channels required to successfully market a vaccine, we believe 
collaborations with major pharmaceutical companies are the most effective way 
to apply our patented technology in the emerging DNA vaccine field. See 
"--Collaboration and Licensing Agreements--Corporate Partners--Merck & Co., 
Inc.," "--Pasteur Merieux Connaught," "--Merial" and "--Collaboration and 
Licensing Agreements--Research Institutions--Office of Naval Research."

         MALARIA. We are collaborating with PMC and the U.S. Naval Medical 
Research Center (NMRC) to develop a DNA vaccine against malaria. There is no 
effective vaccine against malaria. This is a severe infectious disease 
characterized by fever, headache and joint pain, which if untreated can lead 
to death. Infection normally occurs when the parasite enters a victim's 
bloodstream during a mosquito bite. An estimated 300 million people are 
affected by malaria worldwide, with more than one million deaths each year.

         In July 1997, Vical and PMC began a Phase I trial of an experimental 
vaccine against the parasite that causes malaria. NMRC conducted the clinical 
trial with approximately twenty volunteers. Trial results, reported in an 
October 1998 issue of SCIENCE, indicated that subjects immunized with a 
potential malaria DNA vaccine developed dose-related killer T-cell immune 
responses. As a result of these encouraging data, further clinical 
development is planned.

GENE-BASED THERAPEUTIC PROTEIN DELIVERY

         Vical's direct gene transfer technology may permit the development 
of alternatives to therapeutic protein administration for other diseases. 
Major shortcomings of some therapeutic proteins include their short duration 
of action and the potential side effects associated with high levels of 
circulating protein after intravenous administration. We believe that direct 
injection into muscles of genes that encode for the protein of interest may 
enable the muscle to act as a protein factory causing a sustained release of 
low levels of the therapeutic proteins and reducing side effects and the need 
for repeated dosing. Vical's technology may be most suitable for the delivery 
of proteins that are required in small amounts over prolonged periods of time.

         Much attention is being focused on the emerging field of 
angiogenesis, which involves inducing the growth of new blood vessels to 
replace those blocked by disease. Gene-based delivery of growth factors has 
been successfully demonstrated in human trials. Other potential applications, 
still being tested in animal models, could involve the delivery of proteins 
that maintain nerve cell function for treating certain neurodegenerative 
diseases, or the delivery of biologically active compounds such as insulin to 
treat diabetes or erythropoeitin to treat certain forms of anemia.

                                       8
<PAGE>

         In 1997, Vical licensed its patented naked DNA technology to Merck 
for the delivery of certain angiogenic growth factors that may be useful in 
cardiovascular applications such as coronary artery disease and peripheral 
vascular disease. Coronary artery disease, a narrowing of the blood vessels 
supplying the heart, can lead to severe chest pain and heart attack. Coronary 
artery disease is the single largest cause of death in the United States. 
Peripheral vascular disease affects the blood vessels in the limbs, most 
commonly narrowing of the blood vessels of the lower extremities for which 
therapy is very limited. In September 1998, we licensed our catheter-based 
intravascular gene delivery technology to Boston Scientific Corporation.

         We licensed our gene delivery technology to Rhone-Poulenc Rorer 
(RPR) in 1997 for the delivery of neurologically active proteins that may be 
applicable in treating neurodegenerative diseases such as Alzheimer's, 
Parkinson's and Lou Gehrig's diseases. In early 1999, Vical licensed its gene 
delivery technologies to Pfizer Inc. for potential use in delivering 
therapeutic proteins for animal health applications. See "--Collaboration and 
Licensing Agreements--Corporate Partners--Merck & Co., Inc.," 
"--Rhone-Poulenc Rorer," "--Boston Scientific Corporation" and "--Pfizer Inc."









                                       9
<PAGE>

         Vical's product development programs are summarized in the following 
table:

<TABLE>
MCaption
- ---------------------------------- --------------------------- ------------------------------ ------------------------------
             Project                  Target Indication(s)         Development Status(1)          Development Rights(2)
- ---------------------------------- --------------------------- ------------------------------ ------------------------------
<S>                                <C>                         <C>                            <C>
CANCER

ALLOVECTIN-7                       Melanoma,                   Phase III                      Vical
                                   Head and neck cancer        Phase II                       Vical

LEUVECTIN                          Renal cell carcinoma        Phase II                       Vical
                                   Prostate cancer             Phase I/II                     Vical

VAXID                              B-cell lymphoma             Phase I/II                     Vical

gp100                              Melanoma                    Phase I/II                     Vical (3)

Therapeutic DNA vaccines           Various cancers             Preclinical/Phase I            Centocor


INFECTIOUS DISEASES
Preventive DNA vaccines            Influenza                   Phase I                        Merck

                                   Malaria                     Phase I                        Pasteur Merieux Connaught

                                   HIV, herpes, hepatitis B    Research/preclinical           Merck
                                   and C, tuberculosis,
                                   papilloma

                                   CMV, RSV, Lyme, H.pylori,   Research/preclinical           Pasteur Merieux Connaught
                                   herpes zoster

                                   Chlamydia                   Research/preclinical           Vical

Therapeutic DNA vaccines           Hepatitis B, HIV,           Research/preclinical           Merck
                                   papilloma

Veterinary DNA vaccines            Various                     Research                       Merial


OTHER DISEASES
Therapeutic protein DNA            Cardiovascular diseases     Research/preclinical           Merck

Therapeutic protein DNA            Neurodegenerative Diseases  Research/preclinical           Rhone-Poulenc Rorer

Catheter-based DNA therapy         Cardiovascular diseases     Research/preclinical           Boston Scientific

Therapeutic protein DNA            Animal Health               Research                       Pfizer

- ---------------------------------- --------------------------- ------------------------------ ------------------------------
</TABLE>

(1)  As denoted in the table, "Research" indicates research related to
     identification and synthesis of lead compounds. "Preclinical Development"
     indicates that a specific compound is undergoing toxicology testing and
     manufacturing scale-up, among other things, in preparation for filing an
     application for an investigational new drug (IND). In Phase I, trials are
     conducted with a small number of healthy volunteers to determine the safety
     profile, the pattern of drug distribution and metabolism. In Phase II,
     trials are conducted with a larger group of patients afflicted with a
     target disease in order to determine preliminary efficacy, optimal dosages
     and expanded evidence of safety. In the case of products for
     life-threatening diseases, the initial human testing is generally done in
     patients rather than in healthy volunteers. Since these patients are
     already afflicted with the target disease, it is possible that such studies
     may provide results traditionally obtained in Phase II trials. Such trials
     are frequently referred to as "Phase I/II" trials. See "--Clinical Trials."

(2)  See "--Collaboration and Licensing Agreements--Corporate Partners."

(3)  Vical owns the rights to any inventions developed solely by Vical employees
     under a Cooperative Research and Development Agreement (CRADA) with the
     National Cancer Institute (NCI) and has the option to obtain a license for
     inventions developed jointly with NCI or solely by NCI under the CRADA.

                                       10
<PAGE>

COLLABORATION AND LICENSING AGREEMENTS

         Vical has entered into various arrangements with corporate, academic 
and government collaborators, licensors, licensees and others. Our success is 
partially dependent upon the subsequent success of these outside parties in 
performing their responsibilities. We believe these parties have an economic 
incentive to perform their contractual responsibilities. However, the 
progress of these activities is not controlled by us. The parties may not 
perform their obligations and we may not derive any revenue from such 
arrangements. In addition, the collaborators may pursue alternative 
technologies.

         We have entered into, and expect to enter into, research 
collaborations, licensing agreements and corporate collaborations. In 
addition to the agreements summarized below, we conduct ongoing negotiations 
with potential corporate partners. However, we may not be able to negotiate 
additional acceptable collaborative agreements.

         CORPORATE PARTNERS

         MERCK & CO., INC. In May 1991, we entered into a research 
collaboration and license agreement with Merck to develop vaccines utilizing 
Vical's intramuscular delivery technology to prevent infection and/or disease 
in humans. In connection with the 1991 agreement, we granted Merck a 
worldwide exclusive license to preventive vaccines using our technology 
against seven human infectious diseases: influenza, HIV, herpes simplex, HBV, 
HCV, HPV and tuberculosis.

         In addition, Merck has rights to therapeutic uses of preventive 
vaccines developed under the 1991 agreement. In December 1995 and November 
1997, Merck acquired additional rights to develop and market therapeutic 
vaccines against HPV, HIV and HBV. Under the November 1997 amendment, Merck 
made an investment of $5.0 million for approximately 262,000 shares of 
Vical's common stock.

          In September 1997, we also entered into an option and license 
agreement granting Merck the rights to use Vical's naked DNA technology to 
deliver certain growth factors as potential treatments for cardiovascular 
applications. The agreement resulted in an initial payment to Vical of $2.0 
million.

         In connection with these agreements, Merck has paid Vical $19.1 
million as of December 31, 1998. Merck is obligated to pay additional fees if 
research milestones are achieved with respect to the products developed under 
the various Merck agreements and royalties on net sales by Merck of products, 
if any products are developed and marketed. For some indications Vical has an 
opportunity to co-promote product sales.

         PASTEUR MERIEUX CONNAUGHT. In September 1994, Vical entered into a 
collaborative agreement with the vaccine manufacturer PMC covering the use of 
Vical's proprietary gene delivery and technologies for developing vaccines 
against CMV, RSV, Lyme disease, helicobacter pylori and malaria. In April 
1996, herpes zoster was added. PMC is obligated to make milestone and royalty 
payments to Vical if any products are developed and marketed. In July 1997, 
PMC paid us $1.0 million as a milestone payment upon initiation of a Phase I 
trial of an experimental vaccine against the parasite that causes malaria. 
Through December 31, 1998, Vical had received $7.8 million under this 
agreement.

         RHONE-POULENC RORER PHARMACEUTICALS, INC. In October 1997, Vical and 
Rhone-Poulenc Rorer Pharmaceuticals, Inc. ("RPR") entered into an agreement 
granting RPR an exclusive worldwide license to use our naked DNA gene 
delivery technology to deliver certain neurologically active proteins for 
potential treatment of neurodegenerative diseases. Under the terms of the 
agreement, we received $1.0 million in 1997. This agreement provides for us 
to receive additional payments based upon achievement of milestones and 
royalty payments on product sales.

         CENTOCOR, INC. In February 1998, Vical entered into a license 
agreement allowing Centocor, Inc. to use our naked DNA technology to develop 
and market certain gene-based vaccines for the potential treatment of some 
types of cancer. We received an initial payment of $2.0 million plus 
reimbursement of $200,000 of patent costs. We may receive additional payments 
based upon achievement of milestones and royalty payments on product sales.

                                       11
<PAGE>

         MERIAL. Vical entered into a corporate alliance in March 1995 
relating to DNA vaccines in the animal health area with Merial (a joint 
venture between Merck and Rhone Merieux). Merial has options to take 
exclusive licenses to Vical's gene delivery technologies to develop and 
commercialize gene-based vaccines to prevent infectious diseases in 
domesticated animals. Through December 31, 1998, Vical had received $2.1 
million under this agreement. If Merial exercises its license options and 
markets these vaccines, cash payments and royalties on sales would be due to 
Vical.

         PFIZER INC. In January 1999, Vical and Pfizer entered into a 
collaborative license and option agreement to develop and market gene-based 
delivery of therapeutic proteins for animal health applications. Under the 
agreement, Pfizer made an investment of $6.0 million for approximately 
318,000 shares of Vical common stock. Pfizer also paid Vical a $1.0 million 
upfront license fee, and is obligated to pay Vical $1.5 million for research 
and development over the first three years of the agreement.

         BOSTON SCIENTIFIC CORPORATION. In September 1998, Vical and Boston 
Scientific Corporation entered into a license and option agreement for the 
development of catheter-based intravascular gene delivery technology. We 
received $1.1 million in October 1998 under this agreement. The agreement 
provides for us to receive royalty payments on any related product sales.

         GENZYME CORPORATION. In October 1993, Vical entered into a 
collaborative research and option agreement with Genzyme to evaluate the use 
of our proprietary lipids to deliver genes for the treatment of cystic 
fibrosis. In 1996, Genzyme exercised its option to use Vical's lipid 
technology in cystic fibrosis. Through December 31, 1998, Vical had received 
$2.3 million from Genzyme under this agreement. The license agreement 
includes provisions for research, milestone and royalty payments to Vical.

         Under the Merck, PMC, Merial, RPR, Centocor and Pfizer agreements, 
if Vical were to receive milestone or royalty payments, Vical would be 
required to pay 10 percent of some of these payments to Wisconsin Alumni 
Research Foundation. See "--Research Institutions--Wisconsin Alumni Research 
Foundation."

         RESEARCH INSTITUTIONS

         OFFICE OF NAVAL RESEARCH. Vical entered into an agreement in 
September 1998 with the Office of Naval Research for the development work on 
a potential multi-gene DNA vaccine to prevent malaria. The agreement may 
provide funding up to $2.7 million through 2000.

         THE UNIVERSITY OF MICHIGAN. In October 1992, Vical entered into a 
license agreement with the University of Michigan and obtained the exclusive 
license to products using technology for delivering gene-based products into 
cancer cells and blood vessels by catheters. Michigan retained the right to 
grant non-exclusive, non-royalty bearing licenses to the United States 
government and the Howard Hughes Medical Institute. In April 1997, Vical 
entered into a sublicense agreement with Cardiogene Therapeutics, Inc. with 
respect to certain cardiovascular applications of this technology. Cardiogene 
subsequently was acquired by Boston Scientific Corporation which then entered 
into an agreement with Vical in September 1998 for the development of 
intravascular gene delivery technology.

         WISCONSIN ALUMNI RESEARCH FOUNDATION (WARF). Under a 1989 research 
agreement, scientists at the University of Wisconsin, Madison, and at Vical 
co-invented a core technology related to intramuscular naked DNA 
administration. In 1991, Vical licensed WARF's interest in that technology, 
except as to the U.S. government which may hold non-exclusive licenses to 
technology developed with government funds. Vical paid WARF an initial 
license fee and agreed to pay WARF a royalty on sales of any products 
incorporating the licensed technology and a percentage of up-front license 
payments from third parties.

         ACCESS TO PROPRIETARY GENES AND PROTEINS

         A number of the genetic sequences or proteins encoded by those 
sequences that Vical is currently using or may use in its gene-based product 
candidates are, or may become, patented by others. As a result, we may be 
required to obtain licenses to conduct certain research, to manufacture or to 
market products that contain proprietary genetic sequences. Licenses may not 
be available on commercially reasonable terms, or at all.

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<PAGE>

PATENTS AND PROPRIETARY RIGHTS

         Patents and other proprietary rights are important to our business. 
We file patent applications to protect our technology, inventions, and 
improvements to our inventions that are considered important to the 
development of our business.

         Vical also relies upon trade secrets, know-how, continuing 
technological innovations and licensing opportunities to develop and maintain 
its competitive position. We have filed or participated as licensee in the 
filing of more than 300 patent applications in the United States and in 
foreign countries relating to our technology. We have filed a series of 
patent applications seeking to cover naked DNA gene transfer for immunization 
and for delivering therapeutic proteins to patients, specific gene sequences 
and formulations of gene-based product candidates, methods for producing 
pharmaceutical-grade DNA and the composition of matter of several families of 
lipid molecules and their uses in gene delivery. Some of these patents have 
been issued by the U.S. Patent and Trademark Office ("PTO"). Several other 
applications are still pending in the United States, and corresponding 
foreign applications have been filed. The claims may not issue in their 
present form, if at all, and patents, if issued, may be challenged, 
invalidated or circumvented and the rights granted may not provide 
proprietary protection or commercial advantage to Vical. See "--Risk 
Factors--Uncertainty Regarding Our Intellectual Property Rights."

         As of December 31, 1998, Vical or its exclusive licensors had 
received fifteen U.S. patents covering various aspects of its proprietary 
technology. These patents are described below:

         TECHNOLOGY COVERED

         Direct administration of lipid-complexed DNA for immunization 

         Method to deliver a protein by injecting DNA into cardiac muscle 

         Plasmids expressing IL-2 

         Direct administration of naked DNA for immunization

         Direct administration of naked DNA for protein expression 

         Process to reduce RNA during DNA production 

         Process to manufacture pharmaceutical-grade DNA 

         Use of cationic lipids to deliver genes IN VIVO 

         Catheter to facilitate intravascular gene transfer 

         Cationic lipid compositions to facilitate gene transfer IN VIVO 

         Improved purification of DNA using polyethylene glycol (PEG) 

         Method to transfect cells surrounding a blood vessel by catheter 

         Direct administration of naked DNA to transfect vascular wall 

         Compositions and methods for Lyme Disease DNA vaccine 

         Lipids to facilitate gene delivery

         In addition to these issued U.S. patents, Vical's core DNA delivery 
technology is covered by a patent issued in Europe. According to European 
patent procedures, issued patents may be opposed by parties interested in 
challenging the scope or validity of the issued claims. Vical's European 
patent is currently being opposed by several companies pursuant to these 
procedures. We intend to overcome the oppositions and defend our patent 
position in these proceedings. An unfavorable result in these opposition 
proceedings could adversely affect us.

         The patent positions of pharmaceutical and biotechnology firms, 
including Vical, are uncertain and involve complex legal and factual 
questions which are largely unresolved. In addition, the coverage claimed in 
a patent application can be significantly reduced before a patent is issued. 
Consequently, we do not know whether any patent applications will result in 
the issuance of patents or, if any patents are issued, whether those patents 
will provide significant proprietary protection or will be circumvented or 
invalidated. Since patent applications in the United States are maintained in 
secrecy until patents issue or foreign counterparts, if any, publish, and, 
since publication of discoveries in the scientific or patent literature often 
lag behind actual discoveries, we cannot be certain that Vical or any 
licensor was the first creator of inventions covered by pending patent 
applications or was the first to file patent applications for such 
inventions. Moreover, we might have to participate in interference 
proceedings declared by the PTO to determine priority of invention, which 
could result in substantial cost to us, even if we were to prevail. Our 
patents, if issued, may not be held to be valid or enforceable by a court or 
a competitor's technology or product may be found to not infringe such 
patents.

                                       13
<PAGE>

         A number of pharmaceutical and biotechnology companies, and research 
and academic institutions have developed technologies, filed patent 
applications or received patents on various technologies that may be related 
to our business. Some of these technologies, applications or patents may 
conflict with our technologies or patent applications. Such conflict could 
limit the scope of the patents, if any, that we may be able to obtain or 
result in the denial of our patent applications. In addition, if patents that 
cover Vical's activities are issued to other companies, we might not be able 
to obtain licenses to these patents at a reasonable cost or be able to 
develop or obtain alternative technologies.

         In addition to patent protection, we also rely upon trade secret 
protection for our confidential and proprietary information. Others may 
independently develop substantially equivalent proprietary information and 
techniques or otherwise gain access to our trade secrets or disclose such 
technology. We may not be able to meaningfully protect our trade secrets.

         We require our employees, consultants, and parties to collaborative 
agreements to execute confidentiality agreements upon the commencement of 
employment, consulting relationships, or a collaboration with us. These 
agreements provide that all confidential information developed or made known 
during the course of the relationship with Vical is to be kept confidential 
and not disclosed to third parties except in specific circumstances. In the 
case of employees, the agreements provide that all inventions resulting from 
work performed for Vical, utilizing property of Vical or relating to Vical's 
business and conceived or completed by the individual during employment, 
shall be the exclusive property of Vical to the extent permitted by 
applicable law. These agreements may not provide meaningful protection of our 
trade secrets or adequate remedies in the event of unauthorized use or 
disclosure of such information. See "--Risk Factors--Uncertainty Regarding 
Our Intellectual Property Rights May Harm Us."

COMMERCIALIZATION AND MANUFACTURING

         Because of the broad potential applications of our technology, we 
intend to develop and commercialize products both on our own and through 
corporate partners. We intend to develop and market products to well-defined 
specialty markets, such as oncology, infectious diseases and metabolic 
disorders. Where appropriate, we will rely on strategic marketing and 
distribution partners for manufacturing and marketing products addressing 
diseases treated by primary care physicians. We may not be able to reach 
satisfactory arrangements with such distribution partners or such 
arrangements may not be successful.

          We believe our DNA plasmids can be produced in commercial 
quantities in bacterial cells through traditional fermentation and 
purification techniques. The separation and purification of plasmid DNA is a 
relatively straightforward procedure because of the inherent biochemical 
differences between plasmid DNA and the majority of other bacterial 
components. In addition, our lipid formulations consist of components that 
are synthesized chemically using traditional, readily scaleable, organic 
synthesis procedures.

         We produce supplies of product for all of our clinical trials and 
intend to produce sufficient supplies for additional clinical investigations. 
We may also choose to have outside organizations manufacture our product 
candidates for expanded clinical trials under close supervision utilizing our 
proprietary processes. We may not be able to contract for manufacturing 
capabilities on acceptable terms.

COMPETITION

         The field of gene-based drug development is new and rapidly 
evolving, and it is expected to continue to undergo significant and rapid 
technological change. Rapid technological development could result in Vical's 
potential products or technologies becoming obsolete before we recover a 
significant portion of our related research, development and capital 
expenditures. We may experience competition both from other companies in the 
field and from companies which have other forms of treatment for the diseases 
we are targeting. We are aware of several development-stage and established 
enterprises, including major pharmaceutical and biotechnology firms, which 
are exploring gene-based drugs or are actively engaged in gene transfer 
research and development. We may also experience competition from companies 
that have acquired or may acquire technology from companies, universities and 
other research institutions. As these companies develop their technologies, 
they may develop proprietary positions which may materially and adversely 
affect Vical. See "--Risk Factors--Uncertainty Regarding Our Intellectual 
Property Rights May Harm Us."

                                       14
<PAGE>

         Some competitors and potential competitors have substantially 
greater product development capabilities and financial, scientific, marketing 
and human resources than Vical. Other companies may develop products earlier, 
obtain FDA approvals for products more rapidly, or develop products that are 
more effective than those under development by Vical. We will seek to expand 
our technological capabilities to remain competitive, however, research and 
development by others may render our technology or products obsolete or 
noncompetitive or result in treatments or cures superior to ours.

         Our competitive position will be affected by the disease indications 
addressed by our potential products and those of our competitors, the timing 
of market introduction for these potential products and the stage of 
development of other technologies to address these disease indications. For 
Vical and its competitors, proprietary positions, the ability to complete 
clinical trials on a timely basis and the ability to obtain timely regulatory 
approvals to market these potential products are likely to be significant 
competitive factors. Other important competitive factors will include the 
efficacy, safety, reliability, availability and price of potential products 
and the ability to secure sufficient capital resources for the 
often-substantial period between technological conception and commercial 
sales. See "--Risk Factors--The Effect of Competition and Technological 
Change May Hurt Us."

GOVERNMENT REGULATION

         Any products we develop will require regulatory clearances prior to 
clinical trials and additional regulatory clearances prior to 
commercialization. New human gene therapy products are expected to be subject 
to extensive regulation by the FDA and comparable agencies in other 
countries. The precise regulatory requirements with which we will have to 
comply are uncertain at this time due to the novelty of the human gene 
products and therapies currently under development. We believe that our 
potential products will be regulated either as biological products or as 
drugs. Drugs are subject to regulation under the Federal Food, Drug and 
Cosmetic Act, and biological products, in addition to being subject to 
certain provisions of that Act, are regulated under the Public Health Service 
Act. Both statutes and related regulations govern, among other things, the 
testing, manufacturing, safety, efficacy, labeling, storage, record keeping, 
advertising and other promotional practices. FDA approval or other clearances 
must be obtained before clinical testing, and before manufacturing and 
marketing of biologics or drugs.

         Obtaining FDA approval historically has been a costly and 
time-consuming process. Generally, in order to gain FDA premarket approval, 
preclinical studies must be conducted in the laboratory and in animal model 
systems to gain preliminary information on an agent's efficacy and to 
identify any major safety concerns. The results of these studies are 
submitted as a part of an application for an investigational new drug (IND), 
which the FDA must review and allow before human clinical trials can start. 
The IND includes a detailed description of the clinical investigations.

                  A company must sponsor and file an IND for each proposed 
product and must conduct clinical studies to demonstrate the safety, efficacy 
and potency that are necessary to obtain FDA approval. The FDA receives 
reports on the progress of each phase of clinical testing, and it may require 
the modification, suspension, or termination of clinical trials if an 
unwarranted risk is presented to patients. Human gene therapy products are a 
new category of therapeutics, and the clinical trial period may be lengthy or 
the number of patients may be numerous in order to establish safety, efficacy 
and potency.

         After completion of clinical trials of a new product, FDA marketing 
approval must be obtained. If the product is regulated as a biologic, a 
Biologic License Application (BLA) is required. If the product is classified 
as a new drug, a New Drug Application (NDA) is required. The NDA or BLA must 
include results of product development activities, preclinical studies and 
clinical trials in addition to detailed manufacturing information.

                                       15
<PAGE>

         Applications submitted to the FDA can take typically two to five 
years to receive approval after filing. If questions arise during the FDA 
review process, approval can take more than five years. The FDA may 
ultimately decide that the application does not satisfy its criteria for 
approval or require additional preclinical or clinical studies. Even if FDA 
regulatory clearances are obtained, a marketed product is subject to 
continual review, and later discovery of previously unknown problems or 
failure to comply with the applicable regulatory requirements may result in 
restrictions on the marketing of a product or withdrawal of the product from 
the market as well as possible civil or criminal sanctions. Before marketing 
clearance is secured, the manufacturing facility will be inspected for 
current Good Manufacturing Practices (GMP) compliance by FDA inspectors. The 
manufacturing facility must satisfy current GMP requirements prior to 
marketing clearance. In addition, after marketing clearance is secured, the 
manufacturing facility will be inspected periodically for GMP compliance by 
FDA inspectors, and, if the facility is located in California, by inspectors 
from the Food and Drug Branch of the California Department of Health Services.

         In addition to the FDA requirements, the National Institutes of 
Health ("NIH") has established guidelines for research involving recombinant 
DNA molecules. These guidelines apply to all recombinant DNA research which 
is conducted at or supported by the NIH, including proposals to conduct 
clinical research involving gene therapy. The NIH review of clinical trial 
proposals is a public process and usually involves review and approval by the 
Recombinant DNA Advisory Committee of the NIH.

         In both domestic and foreign markets, sales of any approved products 
will depend on reimbursement 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. If we succeed in bringing 
one or more products to market, these products may not be considered 
cost-effective, reimbursement may not be available, or reimbursement policies 
may adversely affect our ability to sell our products on a profitable basis.

         We also are subject to various federal, state and local laws, 
regulations and recommendations relating to safe working conditions, 
laboratory and manufacturing practices, the experimental use of animals and 
the use and disposal of hazardous or potentially hazardous substances, 
including radioactive compounds and infectious disease agents, used in 
connection with our research. The extent of government regulation which might 
result from any future legislation or administrative action cannot be 
accurately predicted.

HUMAN RESOURCES

         As of March 15, 1999, Vical had 101 full-time employees, 20 of whom 
hold degrees at the doctorate level. Of these employees, 78 are engaged in, 
or directly support, research and development activities, and 23 are in 
administrative and business development positions. A significant number of 
our management and professional employees have prior experience with 
pharmaceutical and biotechnology companies. None of our employees is covered 
by collective bargaining agreements, and management considers relations with 
its employees to be good.

PRODUCT LIABILITY EXPOSURE

The use of any products we produce could expose us to product liability 
claims. We currently carry insurance against such claims for clinical trials 
only. We may not have sufficient coverage, or sufficient coverage may not be 
available at a reasonable cost. An inability to obtain product liability 
insurance at acceptable cost or to otherwise protect against potential 
product liability claims could prevent or inhibit the commercialization of 
products developed by Vical. A product liability claim or recall could have a 
material adverse effect on our business or financial condition.

                                       16
<PAGE>

RISK FACTORS

        You should carefully consider the following risk factors when 
evaluating Vical and its prospects as presented in this report or elsewhere 
by management.

        UNCERTAINTY CONCERNING OUR POTENTIAL PRODUCTS AND TECHNOLOGY MAY 
        ADVERSELY AFFECT US

        Very little data exists regarding the safety and efficacy of gene 
therapy. Moreover, existing studies do not necessarily predict that some 
therapy will be safe or effective in humans. This is significant because all 
of our potential products are either in research or development. A failure to 
successfully develop and commercialize products will materially adversely 
affect us. We must conduct a substantial amount of additional research and 
development before any U.S. or foreign regulatory authority will approve any 
of our products. This research and development may indicate that our 
potential products are unsafe or ineffective, in which case, regulatory 
authorities may not approve them. Even if approved, our products may not be 
commercially successful.

        OUR  LOSSES

        We have not sold any products and do not expect to sell any products 
for the next several years. We have incurred cumulative losses totaling 
approximately $37.7 million through December 31, 1998. Moreover, we expect 
that our negative cash flow and losses from operations will continue and 
increase for the foreseeable future. Indeed, we may never generate sufficient 
product revenue to become profitable. We also expect to have 
quarter-to-quarter fluctuations in revenues, expenses and losses, some of 
which could be significant.

        OUR ADDITIONAL FINANCING REQUIREMENTS AND LACK OF ACCESS TO CAPITAL 
        COULD ADVERSELY AFFECT US

        We will need to raise more money to continue the research and 
development necessary to bring products to market and to establish 
manufacturing and marketing capabilities. If we cannot obtain more money we 
will be materially and adversely affected. The amount of money we will need 
will depend on many factors, including:

        -      the progress of our research and development programs

        -      the scope and results of our preclinical studies and clinical 
               trials

        -      the time and costs involved in:

               -      obtaining necessary regulatory approvals

               -      filing, prosecuting and enforcing patent claims

               -      scaling up our manufacturing capabilities

        -      competing technological and market developments

        -      the commercial arrangements we may establish

        -      other factors not within our control

We intend to seek additional funds through public and private stock 
offerings, arrangements with corporate collaborators or other sources. 
However, we may be unable to obtain the money we need on acceptable terms. If 
this happens, we may have to eliminate or scale back some or all of our 
research and development programs or license others to develop products 
and/or technologies that we otherwise would seek to develop ourselves.

        THE REGULATORY APPROVAL PROCESS IS EXPENSIVE, TIME CONSUMING AND 
        UNCERTAIN WHICH MAY ADVERSELY AFFECT US

        The regulations governing gene therapy products are evolving and 
uncertain; seeking to comply with them is expensive and time consuming. 
Failure to obtain FDA approval of our products will materially and adversely 
affect us. For example, the FDA has not established guidelines concerning the 
length of the clinical trial period required for gene therapy products. Nor 
has that agency indicated how many patients it will require to be enrolled in 
clinical trials to establish the safety, efficacy and potency of gene therapy 
products. Furthermore, existing regulations are subject to substantial review 
by various governmental agencies. Therefore, future U.S. or foreign 
regulations could prevent or delay regulatory approval of our products or 
affect adversely our ability to develop, test, manufacture and market our 
products.

        We believe that the FDA and comparable foreign regulatory bodies will 
regulate the commercial use of any of our products as either biologics or 
drugs. These agencies are likely to regulate each product containing a 
particular gene 

                                       17
<PAGE>

as a separate biologic or drug depending on its intended use and evolving 
policy. Presently, to commercialize any product we must sponsor and file a 
regulatory application for each proposed product. We then must conduct 
clinical studies to demonstrate the safety, efficacy and potency of the 
product necessary to obtain FDA approval.

        The NIH also has established guidelines for research involving 
recombinant DNA molecules which is conducted at or supported by the NIH. We 
must comply with these guidelines because we and certain of our collaborators 
use recombinant DNA molecules in our research and we have received grants 
from the NIH. Under current guidelines, we must submit for review to the NIH 
and the Recombinant DNA Advisory Committee each of our proposals to conduct 
clinical research.

        We may be unable to obtain the necessary approvals for clinical 
trials or for the manufacturing or marketing of our products. Even if we do 
obtain regulatory clearance, marketed products remain subject to continual 
review by U.S. regulators. If regulators discover a previously unknown 
problem with one of our products, or if we fail to comply with applicable 
regulations, regulators may:

        -      restrict marketing of the product

        -      withdraw the product from the market

        -      impose civil or criminal sanctions

In addition, many other companies and academic institutions are conducting 
research in the gene therapy field using a variety of approaches and 
technologies. If any of these researchers were to obtain adverse results in 
preclinical or clinical studies this could adversely affect the regulatory 
environment for gene therapy products in general, possibly leading to delays 
in the approval process for our potential products.

        UNCERTAINTY REGARDING OUR INTELLECTUAL PROPERTY RIGHTS MAY HARM US

        Patents may not issue from any of our applications. Moreover, if 
patents do issue, governmental authorities may not allow claims in such 
patents sufficient to protect our technology. Finally, others may challenge 
or seek to circumvent or invalidate patents that are issued to us or to 
licensors of our technology. In that event, the rights granted under patents 
may be inadequate to protect our proprietary technology or to provide any 
commercial advantage.

        Our success will depend in part on our ability to obtain patent 
protection for our products and processes both in the United States and in 
other countries. The patent positions of biotechnology and pharmaceutical 
companies, however, can be highly uncertain and involve complex legal and 
factual questions. Therefore, it is difficult to predict the breadth of 
claims allowed in the biotechnology and pharmaceutical fields. We also seek 
to protect our proprietary technology through confidentiality agreements with 
corporate collaborators, employees, consultants and contractors. Others may 
breach these agreements and we may not have a remedy that is adequate to 
protect our rights.

        Protecting intellectual property rights can also be very expensive. 
Litigation may be necessary to enforce a patent or to determine the scope and 
validity of third-party proprietary rights. Moreover, if a competitor were to 
file a patent application claiming technology also invented by us, we would 
have to participate in an interference proceeding before the U.S. Patent and 
Trademark Office or in a foreign counterpart to determine the priority of the 
invention.

        Our success also will depend in part on our ability to keep from 
infringing upon patents issued to competitors and breaching the technology 
licenses that might cover technology used in our products. We do not know 
whether any patents held by others will require us to alter our products or 
processes, obtain licenses, or stop activities. A number of genetic sequences 
or proteins encoded by genetic sequences that we are investigating are, or 
may become, patented by others. As a result, we may have to obtain licenses 
to test, use or market these products. Our business may suffer if we cannot 
obtain licenses, or if we can obtain them only on terms that are commercially 
unfavorable.

        OUR DEPENDENCE ON OTHERS MAY ADVERSELY AFFECT US

        Our strategy for the research, development and commercialization of 
our products requires us to enter into contractual arrangements with 
corporate collaborators, licensors, licensees and others. Our success depends 
upon the performance by these persons of their responsibilities under these 
arrangements. We cannot control the timing of their 

                                       18
<PAGE>

performance or the amount of resources they will devote to these activities. 
Some persons may not perform their obligations as we expect or we may not 
derive any revenue from these arrangements.

        We have collaborative agreements with several pharmaceutical 
companies. We do not know whether these companies will successfully develop 
and market any products under their respective agreements. Moreover, some of 
our collaborators are also researching competing technologies to treat the 
diseases targeted by our collaborative programs. We may be unsuccessful in 
entering into other collaborative arrangements to develop and commercialize 
our products.

        THE EFFECT OF COMPETITION AND TECHNOLOGICAL CHANGE MAY HURT US

        Gene therapy is a new and rapidly evolving field. We expect that the 
field will continue to undergo significant and rapid technological change. 
Such change could render our products or technologies obsolete.

        We compete with companies in the field of gene therapy and with 
companies pursuing other forms of treatment or prevention for the diseases we 
have targeted. Several development stage and established entities, including 
major pharmaceutical and biotechnology firms, are exploring the field of 
human gene therapy or are actively engaged in research and development in 
areas related to gene therapy. We also may experience competition from 
companies that have acquired or may acquire technology from universities and 
other research institutions. As these companies develop their technologies, 
they may develop proprietary positions in aspects of gene therapy which may 
materially and adversely affect our business.

        Some of our competitors and potential competitors have substantially 
greater product development capabilities and financial, scientific, marketing 
and human resources than we do. Other companies may succeed in developing 
products earlier than we do, obtaining FDA approval for products more rapidly 
than we do, or developing products that are more effective than those we 
propose to develop. While we will seek to expand our technological 
capabilities to remain competitive, research and development by others might 
render our technology or products obsolete or noncompetitive or result in 
treatments or cures superior to any therapy developed by us. Additionally, 
consumers may not prefer therapies developed by us over existing or newly 
developed therapies.

        WE CANNOT MANUFACTURE OR MARKET PRODUCTS ON A COMMERCIAL SCALE WHICH 
        MAY HURT US

        We have neither the resources nor the capability to manufacture or 
market our proposed products on a commercial scale. We may be dependent 
initially on corporate partners, licensees or others to manufacture and 
market our products commercially. If we decide to establish a 
commercial-scale manufacturing facility, we will require substantial 
additional funds and personnel. We also will be required to comply with 
extensive regulations applicable to a manufacturing facility. We may be 
unable to enter into any arrangement for the manufacture or marketing of our 
products. We also may be unable to obtain additional capital to perform these 
activities ourselves.

        THERE IS UNCERTAINTY CONCERNING INSURANCE COVERAGE AND REIMBURSEMENT
        FOR OUR POTENTIAL PRODUCTS WHICH MAY ADVERSELY AFFECT US

        As with many health care products and services, the commercial 
viability of our gene therapy products and related treatments may depend in 
part on whether their costs are covered by health insurers. These insurers 
include:

        -      government health administration authorities

        -      private health coverage insurers

        -      managed care organizations

        -      other similar organizations

        Whenever a new health care product is approved by the regulatory 
authorities it is always uncertain whether insurers will cover the product. 
We do not know whether or to what extent insurers will cover our potential 
products. If purchasers or users of our potential products are not entitled 
to adequate reimbursement for the cost of using our potential products, they 
may decide not to use them or to limit their use. This could harm our 
business.

                                       19
<PAGE>

        OUR USE OF HAZARDOUS MATERIALS COULD ADVERSELY AFFECT US

        Although we do not manufacture commercial quantities of our potential 
products we do produce limited quantities of our potential products for 
clinical trials. Our research and development processes involve the 
controlled storage, use and disposal of hazardous materials, biological 
hazardous materials and radioactive compounds. We are subject to federal, 
state and local regulations governing the use, manufacture, storage, handling 
and disposal of materials and waste products. There is a risk of accidental 
contamination or injury from these materials. In the event of an accident, we 
could be held liable for any damages that result, and any liability could 
exceed our resources. We could be required to incur significant costs to 
comply with current or future environmental laws and regulations. This could 
materially or adversely affect our operations, business or assets.

        VOLATILITY OF STOCK PRICE AND ABSENCE OF DIVIDENDS

        The market price of our common stock, like that of many other life 
sciences companies, has been highly volatile and is likely to continue to be 
highly volatile. The following factors, among others, could have a 
significant adverse impact on the market price of our common stock:

        -      the results of our preclinical studies and clinical trials or
               those of one of our collaborators or competitors

        -      other evidence of the safety or efficacy of our potential
               products or the products of our competitors

        -      the announcement by us or one of our competitors of technological
               innovations or new products

        -      governmental regulatory actions

        -      developments with our collaborators

        -      developments concerning our patent or other proprietary rights or
               those of one of our competitors (including litigation)

        -      concern as to the safety of our potential products

        -      period to period fluctuations in our operating results

        -      market conditions for life science stocks in general

        -      other factors not within our control

We have never paid cash dividends on our common stock and do not anticipate 
paying any cash dividends in the foreseeable future.

        YEAR 2000 ISSUES

        We are unable to control whether our current and future strategic 
partners' computer systems are Year 2000 compliant. Any of the following 
events could affect our operations:

        -      if a strategic partner were unable to purchase our clinical
               materials or services

        -      if a strategic partner were unable to manage its clinical trials
               or research and development activities

        -      if a strategic partner were unable to pay its invoices owed to us

        -      if a supplier were unable to manufacture and ship materials to us
               or provide requested contract services

        Failure of systems maintained by our strategic partners or suppliers 
could cause us to incur significant expenses to remedy any problems, or 
otherwise seriously damage our business.

                                       20
<PAGE>

EXECUTIVE OFFICERS

    The executive officers of Vical are as follows:

<TABLE>
<CAPTION>
NAME                             AGE           POSITION
- ----                             ---           --------
<S>                              <C>           <C>
Alain B. Schreiber, M.D.          43           President, Chief Executive Officer and Director

Deirdre Y. Gillespie, M.D.        42           Executive Vice President and Chief Business Officer

Martha J. Demski                  46           Vice President, Chief Financial Officer, Treasurer and
                                               Secretary

George J. Gray                    52           Vice President, Operations

Jon A. Norman, Ph.D.              50           Vice President, Research

Robert H. Zaugg, Ph.D.            49           Vice President, Business Development
</TABLE>

ALAIN B. SCHREIBER, M.D., has been President, Chief Executive Officer and a 
director of Vical since May 1992. Prior to joining Vical, Dr. Schreiber held 
various executive level positions at Rhone-Poulenc Rorer Inc. from July 1985 
to April 1992, most recently as Senior Vice President of Discovery Research. 
From October 1982 to June 1985, Dr. Schreiber served as Biochemistry 
Department Head at Syntex Corp. He received his undergraduate degree and M.D. 
from the Free University of Brussels, after which he was awarded a fellowship 
in immunology at the Weizmann Institute. Dr. Schreiber serves on the Board of 
Spiros Development Corporation and is an appointed Advisor for Foreign Trade 
for Belgium.

DEIRDRE Y. GILLESPIE, M.D., joined Vical as Executive Vice President and 
Chief Business Officer in March 1998. Dr. Gillespie served as Vice President 
of Business Development for 3-Dimensional Pharmaceuticals, Inc. in 
Pennsylvania from 1997 until joining Vical. From 1991 to 1996, she held 
various management positions with DuPont Merck Pharmaceutical Co. in England 
and Delaware. From 1986 to 1990, Dr. Gillespie directed clinical research 
activities for Sandoz Pharma AG in Switzerland and England. Dr. Gillespie 
received a B.Sc. in Pharmacology and Therapeutics and an M.D. from London 
University. She has MRCP certification (equivalent to internal medicine 
boards in the U.S.). Dr. Gillespie received her M.B.A. from the London 
Business School with a specialization in marketing and international 
management.

MARTHA J. DEMSKI joined Vical as Chief Financial Officer in December 1988 and 
serves as Vice President, Chief Financial Officer, Treasurer and Secretary. 
From August 1977 until joining Vical, Ms. Demski held various positions with 
Bank of America, lastly as Vice President/Section Head of the Technology 
Section. She also served as an adviser to Bank of America on a statewide 
basis regarding the biotechnology industry in California. Ms. Demski received 
a B.A. from Michigan State University and an M.B.A. in Finance and Accounting 
from The University of Chicago Graduate School of Business.

JON A. NORMAN, PH.D., joined Vical in January 1993 as Vice President, 
Research. From 1986 until joining Vical, Dr. Norman was the Group 
Leader/Section Head for the Departments of Pharmacology and Biochemistry at 
Bristol-Myers Squibb Corporation. He was a Senior Research Scientist at 
Ciba-Geigy Corporation, from 1981 to 1986. Dr. Norman received his B.A. and 
M.A. from the University of California at Santa Barbara and his Ph.D. in 
Biochemistry from the University of Calgary, after which he was awarded a 
fellowship at the Friedrich Miescher Institute in Basel, Switzerland.

GEORGE J. GRAY joined Vical in October 1992 as Vice President, Operations. 
Prior to that time he was at Rhone-Poulenc Rorer Inc. where he held various 
positions since 1975, lastly as Director, Discovery Research Ventures, 
U.S./U.K. from January 1990 to October 1992, and prior to that as Director, 
Project Management from January 1988 to December 1989. Mr. Gray received a 
B.A. from George Washington University.

                                       21
<PAGE>

ROBERT H. ZAUGG, PH.D., joined Vical in July 1991 as the Senior Director, 
Business Development and has served as the Vice President of Business 
Development since January 1994. Prior to joining Vical, Dr. Zaugg served as 
Director of Business Development & Licensing for Triton Biosciences from 1988 
to 1991 and in various business development positions with Sandoz 
Pharmaceuticals Corporation from 1982 to 1988. He holds a B.A. from the 
University of California at Los Angeles, a Ph.D. in Biochemistry from 
Northwestern University and an M.B.A. from New York University. He was 
awarded a post-doctoral fellowship in immunology at the Massachusetts 
Institute of Technology.

         The executive officers are elected annually by the Board of 
Directors.

ITEM 2.  PROPERTIES

         Vical currently leases approximately 38,000 square feet of 
laboratory and office space in San Diego, California at three sites and with 
three leases. The leases terminate in 1999 and 2001 and contain varying 
renewal options. Total current monthly rental on the facilities, including 
common area maintenance costs, is approximately $95,000.

ITEM 3.  LEGAL PROCEEDINGS

         Not applicable.

ITEM 4.  SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

         Not applicable.

                                    PART II

ITEM 5.  MARKET FOR REGISTRANT'S COMMON EQUITY AND RELATED STOCKHOLDER MATTERS

           Vical's common stock is traded on the Nasdaq National Market under 
the symbol "VICL." The following table presents quarterly information on the 
price range of high and low sales prices for the common stock on the Nasdaq 
National Market for the periods indicated since January 1, 1997.

<TABLE>
<CAPTION>
1997                                   HIGH                           LOW
- ----                                   ----                           ---
<S>                                    <C>                            <C>
First Quarter                          $18.25                          $14.00
Second Quarter                          15.75                            9.25
Third Quarter                           15.00                           10.625
Fourth Quarter                          17.25                           11.00

<CAPTION>
1998
- ----
<S>                                    <C>                             <C>
First Quarter                          $18.00                          $12.00
Second Quarter                          19.00                           14.00
Third Quarter                           17.875                           7.188
Fourth Quarter                          18.00                            8.00
</TABLE>

         As of March 15, 1999, there were approximately 553 stockholders of 
record of Vical common stock with 16,190,313 shares outstanding. We have 
never declared or paid any dividends and do not expect to pay any dividends 
in the foreseeable future.

         In January 1999, Vical and Pfizer Inc. ("Pfizer") entered into a 
license and option agreement, and a stock purchase agreement under which 
Pfizer made an investment of $6.0 million for approximately 318,000 shares of 
Vical common stock. For this sale of stock, we relied on the exemption from 
registration under Section 4(2) of the Securities Act of 1933.

                                       22
<PAGE>

         ITEM 6.  SELECTED FINANCIAL DATA

<TABLE>
<CAPTION>
                                                                   YEAR ENDED DECEMBER 31,
                                          ---------------------------------------------------------------------------
                                              1998          1997            1996           1995            1994
                                          ------------- -------------- --------------- -------------- ---------------
                                                     (in thousands, except per share and share amounts)
<S>                                       <C>           <C>            <C>             <C>            <C>
STATEMENT OF OPERATIONS DATA:
   Revenues:
       Contract revenue..............     $       876   $     1,326    $     1,061     $       900    $     1,005
       License/royalty revenue.......           5,044         6,477          5,679           5,402          4,509
                                          -----------   -----------    -----------     -----------    -----------
                                                5,920         7,803          6,740           6,302          5,514
   Expenses:
          Research and development...          12,054        11,936         11,318           8,997          8,336
          General and administrative.           3,650         3,733          3,168           2,902          2,615
                                          -----------   -----------    -----------     -----------    -----------
   Loss from operations..............          (9,784)       (7,866)        (7,746)         (5,597)        (5,437)
   Interest income...................           2,465         2,447          2,773           1,687          1,159
   Interest expense..................             162           192            108              73             80
                                          -----------   -----------    -----------     -----------    -----------
   Net loss..........................     $    (7,481)  $    (5,611)   $    (5,081)    $    (3,983)   $    (4,358)
                                          -----------   -----------    -----------     -----------    -----------
                                          -----------   -----------    -----------     -----------    -----------
   Net loss per share (basic and
       diluted) .....................     $      (.47)  $      (.36)   $      (.33)    $      (.29)   $      (.34)
                                          -----------   -----------    -----------     -----------    -----------
                                          -----------   -----------    -----------     -----------    -----------

   Shares used in per share          
       calculation...................     15,797,585    15,484,952     15,382,848      13,504,790     12,831,585
</TABLE>

<TABLE>
<CAPTION>
                                                                      AS OF DECEMBER 31,
                                          ---------------------------------------------------------------------------
                                              1998          1997            1996           1995            1994
                                          ------------- -------------- --------------- -------------- ---------------
                                                                       (in thousands)
<S>                                       <C>           <C>            <C>             <C>            <C>
BALANCE SHEET DATA:
   Cash, cash equivalents and
       marketable securities.........     $    40,184   $    45,555    $    46,846     $    52,528    $    27,339
   Working capital...................          38,398        44,856         46,315          51,541         25,956
   Total assets......................          44,844        50,691         52,440          55,118         30,324
   Long-term obligations.............             801         1,232          1,617             339            527
   Stockholders' equity..............          40,824        47,194         48,365          53,264         27,852
</TABLE>

ITEM 7.  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND 
         RESULTS OF OPERATIONS

OVERVIEW

         Vical was incorporated in April 1987 and since that time has devoted 
substantially all of its resources to its research and development programs. 
We are focusing our resources on the development of our direct gene transfer 
and related technologies. To date, we have not received revenues from the 
sale of products. We cannot assure that we will be able to generate 
sufficient product revenue to become profitable at all or on a sustained 
basis. As of December 31, 1998, our accumulated deficit was approximately 
$37.7 million.

         Vical expects to incur substantial operating losses for at least the 
next several years due to significant increases in research and development 
expenses. The increases are expected to result from costs of preclinical 
studies and clinical trials for our product candidates, increased patent and 
regulatory costs, and associated increases in personnel, laboratory supplies, 
contract services and facilities. Losses may fluctuate from quarter to 
quarter as a result of differences in the timing of expenses incurred and the 
revenues received from collaborative agreements. Such fluctuations may be 
significant.

                                       23
<PAGE>

         When used in this discussion, the words "expects," "anticipated" and 
similar expressions are intended to identify forward-looking statements. 
These statements are subject to risks and uncertainties which could cause 
actual results to differ materially from those projected. Readers are 
cautioned not to place undue reliance on these forward-looking statements 
which speak only as of the date of this report. We undertake no obligation to 
publicly release the result of any revisions to these forward-looking 
statements which may be made to reflect events or circumstances after the 
date of this report to reflect the occurrence of unanticipated events.

         RESULTS OF OPERATIONS

         Vical had revenues of $5.9 million for the year ended December 31, 
1998, compared with $7.8 million in 1997 and $6.7 million in 1996. License 
revenues in 1998 consisted of $2.2 million from Centocor, Inc. for an 
agreement covering technology for the potential treatment of some types of 
cancer, $1.1 million from an agreement with Boston Scientific Corporation for 
the development of catheter-based vascular gene therapy, recognition of $.9 
million of deferred license fees from a further extension of the license and 
option agreement with Merial, royalty revenues of $.7 million and $.2 million 
of other license revenue. Contract revenues in 1998 consisted principally of 
$.7 million from an agreement with the Office of Naval Research for the 
development work on a potential DNA vaccine to prevent malaria. This 
agreement is a multi-year agreement which could provide up to an additional 
$2.0 million in revenues through 2000. Contract revenue in 1998 also included 
$.2 million of reimbursements from PMC and other sources.

         Vical had revenues of $7.8 million for the year ended December 31, 
1997, compared with $6.7 million in 1996. Revenues in 1997 were composed of 
research and license revenue from a 1997 Merck agreement covering certain 
growth factors ($2.0 million); the equity premium on the investment Merck 
made in 1997 in Vical common stock under an amendment to the 1991 
collaborative agreement ($1.0 million); the PMC collaboration ($2.4 million); 
a 1997 collaborative agreement with RPR for neurodegenerative disease targets 
($1.0 million); and other agreements which totaled $1.4 million. In November 
1997, Vical and Merck amended the 1991 agreement and granted Merck rights to 
develop and market therapeutic vaccines against HIV and HBV. Under the 
November 1997 amendment, Merck made an investment of $5.0 million for 
approximately 262,000 shares of Vical common stock. The price per share 
reflected a twenty-five percent premium over the trading price of the common 
stock. The premium on the investment was reflected in revenue in 1997. The 
PMC revenue represented contract revenue of $1.1 million as payment for 
clinical and preclinical work and license revenue of $1.3 million, of which 
$1.0 million was for a milestone payment for the start of the malaria 
clinical trial and the balance was the recognition of deferred license fees. 
Revenues in 1996 resulted from research and license revenue from: the PMC 
collaboration in the amount of $2.7 million, the 1991 Merck agreement in the 
amount of $1.5 million, the Genzyme collaboration in the amount of $1.3 
million, and several other agreements in the amount of $1.2 million. Revenue 
from the PMC agreement in 1996 was primarily the result of PMC's payment of 
licensing and option fees, and the addition of a new option, as well as the 
payment of fees for Vical's performance of clinical and preclinical work. The 
Merck revenue resulted from milestone payments due under the 1991 Merck 
agreement. The Genzyme collaboration income was the result of Genzyme 
exercising its option to license our technology for the treatment of cystic 
fibrosis as well as payments for our performance of research and preclinical 
work.

         Research and development expense increased to $12.1 million in 1998 
from $11.9 million in 1997 and $11.3 million in 1996. The increases in 
research and development expense were generally due to expansion of our 
research and development activities. The increase in 1998 principally was due 
to increased clinical trial costs and additional royalty expense for license 
agreements. The increase in expenses in 1997 compared to 1996 included 
increased clinical and preclinical efforts which resulted in increases to 
staffing, increased facilities related costs and increased expenditures on 
laboratory supplies. Clinical trials expense increased to $1.9 million during 
1998 from $1.6 million in 1997. This increase was due to the commencement of 
the Phase II and Phase III clinical trials of ALLOVECTIN 7 for melanoma. 
Clinical trials expense increased to $1.6 million during 1997 from $1.2 
million in 1996 primarily due to the commencement of the malaria clinical 
trial and increased clinical trials activity on LEUVECTIN. During 1996, we 
incurred expenses of approximately $1.2 million with the commencement and 
progression of the multi-center Phase I/II and Phase II clinical trials of 
LEUVECTIN and ALLOVECTIN-7 respectively. Research and development expense is 
expected to increase in 1999 and thereafter as our preclinical and clinical 
trial activities increase.

                                       24
<PAGE>

         General and administrative expense decreased to $3.6 million in 1998 
from $3.7 million in 1997 due to lower insurance and facilities expenses. The 
increase to $3.7 million in 1997 from $3.2 million during 1996 was due 
primarily to additional staffing and related expenses. General and 
administrative expenses are expected to continue to increase as research and 
development activities expand.

         Interest income increased to $2.5 million in 1998 from $2.4 million 
in 1997 due to higher rates of return on investments. Interest income of $2.4 
million during 1997 declined from the $2.8 million in 1996, due to lower 
investment balances as we redeemed investments to fund operating expenses. 
Interest expense decreased during 1998 due to lower capital lease 
obligations, lower balance of bank note payable and lower interest rates on 
the newer capital lease obligations. Interest expense increased in 1997 
compared to the previous year due to increased capital lease obligations to 
finance equipment needs and the addition of a debt instrument in 1996.

YEAR 2000 ISSUES

         The Year 2000 problem is due to many computer systems using only two 
digits rather than four to designate a specific year. As a result, many of 
these systems may fail to function properly if a date beyond 1999 is entered. 
We have completed our assessment of any potential Year 2000 issues for our 
internal computer applications, including embedded control systems in 
equipment, to determine whether they will function for the year 2000 and 
beyond and what modifications, if any, would be required to ensure their 
continuing functionality. We plan to upgrade our existing business 
applications software to the latest Year 2000 compliant release of the 
software by June 1, 1999. We also plan to implement a new financial and 
accounting system and related hardware to meet our growing needs into the 
near future. This new system will be Year 2000 compliant and implemented 
prior to yearend. Given the relatively small size of our systems and the 
predominantly new hardware, software and operating systems, we do not 
anticipate any significant delays in becoming Year 2000 compliant. To date 
our costs for Year 2000 compliance have been immaterial and we expect our 
costs to finish becoming Year 2000 compliant to be immaterial.

         We are unable to control whether our current and future strategic 
partners' systems are Year 2000 compliant. The failure of systems maintained 
by our strategic partners or suppliers could cause us to incur significant 
expenses to remedy any problems, or otherwise seriously damage our business. 
We are communicating with strategic partners to assess the risk of Year 2000 
issues. We have not completed the inquiries of the strategic partners. 
However, we are not aware, at this time, of any material Year 2000 issues 
regarding our dealings with our strategic partners. We anticipate that our 
assessment will be completed by July 31, 1999.

         At this time, we have no reason to believe that Year 2000 changes 
will have a material impact on Vical's business, financial condition or 
results of operations. Since no significant issues have been identified, we 
do not have a comprehensive contingency plan to address any material Year 
2000 issues. A contingency plan, if required, will be developed for all 
applications and systems that affect core business functions upon completion 
of our assessment of Year 2000 issues. We do plan to perform backups of the 
existing and upgraded versions of the computer system so that in the event 
our planned new financial and accounting system and related hardware do not 
function properly we can continue to operate under the old system. Vical has 
not identified what it believes would be a reasonably likely worst case 
scenario with respect to Year 2000 failures.

LIQUIDITY AND CAPITAL RESOURCES

         Since its inception, Vical has financed its operations primarily 
through private placements of common stock and preferred stock, three public 
offerings of common stock, and revenues from collaborative agreements. As of 
December 31, 1998, we had working capital of approximately $38.4 million 
compared with $44.9 million at December 31, 1997. Cash and marketable 
securities totaled approximately $40.2 million at December 31, 1998, compared 
with $45.6 million at December 31, 1997.

         We expect to incur substantial additional research and development 
expense and general and administrative expense. Our future capital 
requirements will depend on many factors, including the rate of scientific 
progress in our research and development programs, the scope and results of 
preclinical testing and clinical trials, the time and costs involved in 
obtaining regulatory approvals, the costs involved in filing, prosecuting and 
enforcing patent claims, competing technological and market developments, the 
cost of manufacturing scale-up, commercialization activities and arrangements 
and other factors not within our control. We intend to seek additional 
funding through research and development relationships with suitable 
potential corporate collaborators and/or through public or private 
financings. We cannot assure that additional financing will be available on 
favorable terms, if at all.

                                       25
<PAGE>

         If additional financing is not available, Vical anticipates that our 
available cash and existing sources of funding will be adequate to satisfy 
our operating needs through at least 2000.

ITEM 7.a  QUANTITATIVE AND QUALITATIVE DISCLOSURE ABOUT MARKET RISK

Vical's investment portfolio is maintained in accordance with our investment 
policy which defines allowable investments, specifies credit quality 
standards and limits the credit exposure of any single issuer. No investments 
in equity securities are made. At December 31, 1998, 96 percent of the 
investments would mature within two years, none would mature beyond three 
years, and the average maturity was nine months. Our investments are all 
classified as available-for-sale securities. We are subject to interest rate 
risk. We projected an ending fair value of our cash equivalents and 
marketable securities using a twelve-month time horizon, a nine-month average 
maturity and assuming a 150-basis-point increase in interest rates. The 
decrease in fair value assuming a 150-basis-point increase in interest rates 
compared with fair value with no change in interest rates was not material.

ITEM 8.  FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

         The consolidated financial statements and supplementary data of 
Vical required by this item are set forth at the pages indicated in Item 
14(a)(1).

ITEM 9.  CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND 
         FINANCIAL DISCLOSURE

Not applicable.

                                  PART III

ITEM 10. DIRECTORS AND EXECUTIVE OFFICERS

DIRECTORS

    The directors of Vical are as follows:

<TABLE>
<CAPTION>
NAME                                         AFFILIATION
- ----                                         -----------
<S>                                          <C>
Alain B. Schreiber, M.D.                     Vical Incorporated
Robert C. Bellas, Jr.                        Morgenthaler Ventures
M. Blake Ingle                               Canji, Inc. (retired)
Patrick F. Latterell                         Venrock Associates
Fred A. Middleton                            Sanderling Ventures
Dale A. Smith                                Baxter International Inc. (retired)
Philip M. Young                              U.S. Venture Partners
Gary A. Lyons                                Neurocrine Biosciences, Inc.
</TABLE>

         The information required by this item (with respect to Directors) is 
incorporated by reference from the information under the caption "Election of 
Directors" contained in Vical's Proxy Statement to be filed with the 
Securities and Exchange Commission in connection with the solicitation of 
proxies for Vical's 1999 Annual Meeting of Stockholders to be held on May 27, 
1999 ("Proxy Statement").

         The required information concerning Executive Officers of Vical is 
contained in Part I of this Form 10-K.

ITEM 11. EXECUTIVE COMPENSATION

      The information required by this item is incorporated by reference from 
the information under the caption "Executive Compensation" contained in the 
Proxy Statement.

                                       26
<PAGE>

ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

      The information required by this item is incorporated by reference from 
the information under the caption "Security Ownership of Certain Beneficial 
Owners and Management" contained in the Proxy Statement.

ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

      The information required by this item is incorporated by reference from 
the information contained under the caption "Certain Transactions" contained 
in the Proxy Statement.

                                     PART IV

ITEM 14. EXHIBITS, FINANCIAL STATEMENT SCHEDULES, AND REPORTS
         ON FORM 8-K

  (a)    (1)      FINANCIAL STATEMENTS

         The financial statements required by this item are submitted in a 
  separate section beginning on page F-1 of this report.

<TABLE>
<CAPTION>
                  FINANCIAL STATEMENTS
<S>               <C>                                                                 <C>
                  Report of Independent Public Accountants                              F-1

                  Balance Sheets at December 31, 1998 and 1997                          F-2

                  Statements of Operations for the three years                          F-3
                      ended December 31, 1998

                  Statements of Stockholders' Equity                                    F-4
                      for the three years ended December 31, 1998

                  Statements of Cash Flows for the three years                          F-5
                      ended December 31, 1998

                  Notes to Financial Statements                                         F-6
</TABLE>

         (2)      FINANCIAL STATEMENT SCHEDULES

         Schedules have been omitted because of the absence of conditions 
  under which they are required or because the required information is included 
  in the financial statements or the notes thereto.

         (3) Exhibits with each management contract or compensatory plan or 
  arrangement required to be filed are identified. See paragraph (c) below.

  (b)    REPORTS ON FORM 8-K

  No reports on Form 8-K were filed during the quarter ended December 31, 
  1998.

                                       27
<PAGE>

  (c)    EXHIBITS

<TABLE>
<CAPTION>
           EXHIBIT
           NUMBER                      DESCRIPTION OF DOCUMENT
           -------                     -----------------------
<S>                       <C>
           3.1(i)(10)     Restated Certificate of Incorporation.
           3.1(ii)(10)    Amended and Restated Bylaws of the Company.
           3.2(i)(2)      Certificate of Designation, Rights and Preferences of
                           Series A Participating Preferred Stock of Vical
                           Incorporated.
           4.1(10)        Specimen Common Stock Certificate.
           4.2(2)         Rights Agreement dated as of March 20, 1995, between
                           the Company and First Interstate Bank of California.
           4.3(11)        Stock Purchase Agreement dated November 3, 1997,
                           between the Company and Merck & Co., Inc.
           10.1(4)#       Stock Incentive Plan of Vical Incorporated.
           10.2(5)#       1992 Directors' Stock Option Plan of Vical 
                           Incorporated.
           10.3(3)        Form of Indemnity Agreement between the Company and
                           its directors and officers.
           10.5(3)#       Employment Agreement dated August 20, 1992, between
                           the Company and Mr. George J. Gray.
           10.6(3)#       Employment Agreement dated November 2, 1992, between
                           the Company and Dr. Jon A. Norman.
           10.7(3)        Stock Purchase Agreement dated February 20, 1992.
           10.8(3)        Lease dated December 4, 1987, between the Company and
                           Nexus/GADCo.-UTC, a California Joint Venture, as
                           amended.
           10.9(6)*       Research Collaboration and License Agreement dated May
                           31, 1991, between the Company and Merck & Co., Inc.
           10.12(1)*      License Agreement dated January 1, 1991, between the
                           Company and Wisconsin Alumni Research Foundation.
           10.14(1)*      License Agreement dated October 23, 1992, between the
                           Company and the Regents of University of Michigan.
           10.16(7)       Research, Option and License Agreement dated September
                           29, 1994, between the Company and Pasteur Merieux
                           Serums & Vaccins.
           10.17(8)       Amendment dated April 27, 1994, to Research
                           Collaboration and License Agreement dated May 31,
                           1991, between the Company and Merck & Co., Inc.
           10.18(9)*      Agreement between Merck & Co., Inc. and the Company
                           dated September 12, 1997.
           10.19(11)*     Amendment dated November 3, 1997, to Research
                           Collaboration and License Agreement dated May 31,
                           1991, between the Company and Merck & Co., Inc.
           23.1           Consent of Arthur Andersen LLP.
           24             Power of Attorney (see page 30).
           27             Financial Data Schedule
</TABLE>

- -----------
         (1)    Incorporated by reference to the Company's Registration
                Statement on Form S-1 (No. 33-56830) filed on January 7, 1993.
         (2)    Incorporated by reference to the exhibit of the same number to
                the Company's Report on Form 10-K for the Fiscal Year ended
                December 31, 1994 (No. 0-21088).
         (3)    Incorporated by reference to the Exhibits of the same number
                filed with the Company's Registration Statement on Form S-1 (No.
                33-56830) filed on January 7, 1993.
         (4)    Incorporated by reference to Exhibit A filed with the Company's
                Schedule 14A Definitive Proxy Statement on Form DEF 14A filed on
                April 14, 1998.
         (5)    Incorporated by reference to Exhibit 10.1 filed with the
                Company's Registration Statement on Form S-8 (No. 33-87972)
                filed on December 29, 1994.
         (6)    Incorporated by reference to Exhibit 10.9 of the Company's
                Quarterly Report on Form 10-Q for the quarter ended September
                30, 1994 (No. 0-21088).
         (7)    Incorporated by reference to Exhibit A of the Company's
                Quarterly Report on Form 10-Q for the quarter ended September
                30, 1994.
         (8)    Incorporated by reference to the Company's Quarterly Report on
                Form 10-Q for the quarter ended June 30, 1994 (No. 0-21088).

                                       28
<PAGE>

         (9)    Incorporated by reference to the exhibit of the same number to
                the Company's Quarterly Report on the Form 10-Q for the quarter
                ended September 30, 1997, as amended by Form 10-Q/A filed
                January 30, 1998.
         (10)   Incorporated by reference to the exhibit of the same number
                filed with the Company's Registration Statement on Form S-3 (No.
                33-95812) filed on August 15, 1995.
         (11)   Incorporated by reference to the exhibit of the same number to
                the Company's Annual Report on Form 10-K for the year ended
                December 31, 1997, filed on March 30, 1998.

         * The Company has received confidential treatment of certain portions 
           of these agreements.
         # Indicates management contract or compensatory plan or arrangement.

  (d) FINANCIAL STATEMENT SCHEDULES

         The financial statement schedules of Vical Incorporated required by
      this item are set forth at the pages indicated in Item 14(a)(2).

                                       29
<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 March 30, 1999.

                               VICAL INCORPORATED

                By:         /s/ ALAIN B. SCHREIBER, M.D.
                    --------------------------------------------
                            Alain B. Schreiber, M.D.
                      President and Chief Executive Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, this 
report has been signed below by the following persons on behalf of the 
Registrant and in the capacities and on the dates indicated.

KNOW ALL MEN BY THESE PRESENTS, that each person whose signature appears 
below constitutes and appoints Alain B. Schreiber and Martha J. Demski, and 
each of them, his or her attorneys-in-fact, each with full power of 
substitution, for him or her in any and all capacities, to sign any 
amendments to this Report 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 said 
attorneys-in-fact, or substitute or substitutes, may do or cause to be done 
by virtue hereof.


<TABLE>
<S>                                                    <C>                                  <C>
       /s/ ALAIN B. SCHREIBER, M.D.                    President,                           March 30, 1999
- ------------------------------------------             Chief Executive Officer
         Alain B. Schreiber, M.D.                      and Director

           /s/ MARTHA J. DEMSKI                        Vice President, Finance              March 30, 1999
- ------------------------------------------             Chief Financial Officer
             Martha J. Demski                          Secretary and Treasurer

        /s/ ROBERT C. BELLAS, Jr.                      Director                             March 30, 1999
- ------------------------------------------
          Robert C. Bellas, Jr.

          /s/ FRED A. MIDDLETON                        Director                             March 30, 1999
- ------------------------------------------
            Fred A. Middleton

           /s/ PHILIP M. YOUNG                         Director                             March 30, 1999
- ------------------------------------------
             Philip M. Young

         /s/ PATRICK F. LATTERELL                      Director                             March 30, 1999
- ------------------------------------------
           Patrick F. Latterell

            /s/ DALE A. SMITH                          Director                             March 30, 1999
- ------------------------------------------
              Dale A. Smith

            /s/ M. BLAKE INGLE                         Director                             March 30, 1999
- ------------------------------------------
              M. Blake Ingle

            /s/ GARY A. LYONS                          Director                             March 30, 1999
- ------------------------------------------
              Gary A. Lyons
</TABLE>

                                       30
<PAGE>

                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS

To Vical Incorporated:

We have audited the accompanying balance sheets of Vical Incorporated, a 
Delaware corporation, as of December 31, 1998 and 1997, and the related 
statements of operations, stockholders' equity, and cash flows for each of 
the three years in the period ended December 31, 1998. These financial 
statements are the responsibility of the Company's management. Our 
responsibility is to express an opinion on these financial statements 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 financial position of Vical Incorporated as of 
December 31, 1998 and 1997, and the results of its operations and its cash 
flows for each of the three years in the period ended December 31, 1998, in 
conformity with generally accepted accounting principles.



                                                       ARTHUR ANDERSEN LLP

San Diego, California
February 8, 1999




                                       F-1
<PAGE>

                                VICAL INCORPORATED
                                   BALANCE SHEETS

<TABLE>
<CAPTION>
                                                                                     December 31,
                                                                                  1998              1997
                                                                           ----------------  ----------------
<S>                                                                        <C>               <C>
ASSETS
Current Assets:
   Cash and cash equivalents (Note 2)                                         $ 13,567,817      $ 12,157,149
   Marketable securities - available-for-sale (Note 2)                          26,615,939        33,397,482
   Receivables and other                                                         1,432,711         1,566,532
                                                                           ----------------  ----------------
Total current assets                                                            41,616,467        47,121,163
                                                                           ----------------  ----------------

Property and Equipment (Note 5):
   Equipment                                                                     5,139,944         4,966,955
   Leasehold improvements                                                        1,558,554         1,587,554
                                                                           ----------------  ----------------
                                                                                 6,698,498         6,554,509
   Less--accumulated depreciation and amortization                              (4,992,121)       (4,334,224)
                                                                           ----------------  ----------------
                                                                                 1,706,377         2,220,285
                                                                           ----------------  ----------------
Patent costs, net of accumulated amortization of $126,638 and
   $74,063 (Note 1)                                                              1,387,936         1,247,059
Other assets                                                                       133,385           102,500
                                                                           ----------------  ----------------
                                                                              $ 44,844,165      $ 50,691,007
                                                                           ----------------  ----------------
                                                                           ----------------  ----------------


LIABILITIES AND STOCKHOLDERS' EQUITY
Current Liabilities:
   Accounts payable and accrued expenses (Note 4)                              $ 2,281,252       $ 1,424,603
   Current portion of capital lease obligations (Note 5)                           473,466           448,261
   Current portion of notes payable (Note 5)                                       213,773           213,773
   Deferred revenue (Note 3)                                                       250,000           178,261
                                                                           ----------------  ----------------
Total current liabilities                                                        3,218,491         2,264,898
                                                                           ----------------  ----------------

Long-Term Obligations:
  Long-term obligations under capital leases (Note 5)                              747,807           911,794
  Notes payable (Note 5)                                                            53,443           320,660
                                                                           ----------------  ----------------
Total long-term obligations                                                        801,250         1,232,454
                                                                           ----------------  ----------------

Commitments (Note 5)

Stockholders' Equity (Note 6):
   Preferred stock, $.01 par value--5,000,000 shares authorized--
      none outstanding                                                                   -                 -
   Common stock, $.01 par value--40,000,000 shares authorized--                    158,665           157,313
     15,866,544 and 15,731,316 shares issued and outstanding
     in 1998 and 1997, respectively
   Additional paid-in capital                                                   78,332,483        77,267,971
   Accumulated other comprehensive income (Note 2)                                  69,440            24,028
   Accumulated deficit                                                         (37,736,164)      (30,255,657)
                                                                           ----------------  ----------------
Total stockholders' equity                                                      40,824,424        47,193,655
                                                                           ----------------  ----------------
                                                                              $ 44,844,165      $ 50,691,007
                                                                           ----------------  ----------------
                                                                           ----------------  ----------------
</TABLE>

See accompanying notes.

                                       F-2
<PAGE>

                                VICAL INCORPORATED
                             STATEMENTS OF OPERATIONS

<TABLE>
<CAPTION>
                                                                        Year ended December 31,
                                                               1998              1997              1996
                                                          ----------------  ----------------  ----------------
<S>                                                       <C>               <C>               <C>
Revenues (Note 3):
   Contract revenue                                          $    875,773      $  1,325,925      $  1,060,557
   License/Royalty revenue                                      5,044,607         6,477,244         5,679,542
                                                          ----------------  ----------------  ----------------
                                                                5,920,380         7,803,169         6,740,099
                                                          ----------------  ----------------  ----------------

Expenses:
   Research and development                                    12,054,367        11,936,068        11,317,908
   General and administrative                                   3,649,841         3,733,290         3,168,331
                                                          ----------------  ----------------  ----------------
                                                               15,704,208        15,669,358        14,486,239
                                                          ----------------  ----------------  ----------------

Loss from operations                                           (9,783,828)       (7,866,189)       (7,746,140)

Other income (expense):
   Interest income                                              2,465,545         2,447,139         2,772,845
   Interest expense                                              (162,224)         (192,181)         (107,296)
                                                          ----------------  ----------------  ----------------

Net loss                                                     $ (7,480,507)     $ (5,611,231)     $ (5,080,591)
                                                          ----------------  ----------------  ----------------
                                                          ----------------  ----------------  ----------------

Net loss per share (basic and diluted--Note 1)                    $ (0.47)          $ (0.36)          $ (0.33)
                                                          ----------------  ----------------  ----------------
                                                          ----------------  ----------------  ----------------

Weighted average shares used in computing net 
  loss per share                                               15,797,585        15,484,952        15,382,848
                                                          ----------------  ----------------  ----------------
                                                          ----------------  ----------------  ----------------
</TABLE>



See accompanying notes.

                                       F-3
<PAGE>

                               VICAL INCORPORATED
                       STATEMENTS OF STOCKHOLDERS' EQUITY
                   FOR THE THREE YEARS ENDED DECEMBER 31, 1998

<TABLE>
<CAPTION>
                                                                            Accumulated 
                                                  Additional                   Other                        Total         Total
                                Common Stock       Paid-in      Deferred   Comprehensive   Accumulated  Stockholders' Comprehensive
                              Shares    Amount     Capital    Compensation    Income         Deficit        Equity        Loss
                            ---------- --------- ------------ ------------ ------------- -------------- ------------- -------------
<S>                         <C>        <C>       <C>          <C>          <C>           <C>            <C>           <C>
BALANCE, December 31, 1995  15,364,265 $ 153,643 $ 72,728,484  $ (158,427)    $ 104,176  $ (19,563,835) $ 53,264,041

  Stock option exercises        32,317       323      175,988           -             -              -       176,311
  Deferred compensation              -         -            -     158,427             -              -       158,427
  Unrealized loss on 
   marketable securities 
   arising during 
   holding period                                                                                                       $ (136,199)
  Reclassification of 
   realized gain 
   included in net loss                                                                                                    (16,762)
                                                                                                                      -------------
  Unrealized gain (loss) 
   on marketable 
   securities                        -         -            -           -      (152,961)             -      (152,961)     (152,961)
  Net loss                           -         -            -           -             -     (5,080,591)   (5,080,591)   (5,080,591)
                            ---------- --------- ------------ ------------ ------------- -------------- ------------- -------------
BALANCE, December 31, 1996  15,396,582   153,966   72,904,472           -       (48,785)   (24,644,426)   48,365,227    (5,233,552)
                                                                                                                      -------------
                                                                                                                      -------------
  Issuance of common stock 
   at $15.28 per share 
   (Note 3)                    261,812     2,618    3,992,143           -             -              -     3,994,761
  Stock option exercises        72,922       729      371,356           -             -              -       372,085
  Unrealized gain on 
   marketable securities 
   arising during holding 
   period                                                                                                                   87,763
  Reclassification of 
   realized loss included 
   in net loss                                                                                                             (14,950)
                                                                                                                      -------------
  Unrealized gain (loss) on
   marketable securities             -         -            -           -        72,813              -        72,813        72,813
  Net loss                           -         -            -           -             -     (5,611,231)   (5,611,231)   (5,611,231)
                            ---------- --------- ------------ ------------ ------------- -------------- ------------- -------------
BALANCE, December 31, 1997  15,731,316   157,313   77,267,971           -        24,028    (30,255,657)   47,193,655    (5,538,418)
                                                                                                                      -------------
                                                                                                                      -------------
  Stock option exercises       135,228     1,352    1,064,512           -             -              -     1,065,864
  Unrealized gain on 
   marketable securities 
   arising during holding 
   period                                                                                                                   57,041
  Reclassification of 
   realized gain included 
   in net loss                                                                                                             (11,629)
                                                                                                                      -------------
  Unrealized gain (loss) 
   on marketable 
   securities                        -         -            -           -        45,412              -        45,412        45,412
  Net loss                           -         -            -           -             -     (7,480,507)   (7,480,507)   (7,480,507)
                            ---------- --------- ------------ ------------ ------------- -------------- ------------- -------------
BALANCE, December 31, 1998  15,866,544 $ 158,665 $ 78,332,483         $ -      $ 69,440  $ (37,736,164) $ 40,824,424  $ (7,435,095)
                            ---------- --------- ------------ ------------ ------------- -------------- ------------- -------------
                            ---------- --------- ------------ ------------ ------------- -------------- ------------- -------------
</TABLE>

See accompanying notes.

                                       F-4
<PAGE>

                                                      VICAL INCORPORATED
                                                   STATEMENTS OF CASH FLOWS

<TABLE>
<CAPTION>
                                                                                Year ended December 31,
                                                                       1998              1997              1996
                                                                  ----------------  ----------------  ----------------
<S>                                                               <C>               <C>               <C>
OPERATING ACTIVITIES:
Net loss                                                             $ (7,480,507)     $ (5,611,231)     $ (5,080,591)
Adjustments to reconcile net loss to net cash provided
  from (used in) operating activities:
      Depreciation and amortization                                       920,695           939,956           620,033
      Compensation expense related to stock purchases                           -                 -           158,427
      Write-off of abandoned patent application costs                      94,800            80,994             3,247
Changes in operating assets and liabilities:
   Receivables and other                                                  133,821           359,463        (1,397,906)
   Accounts payable and accrued expenses                                  856,649           614,219           282,087
   Deferred revenue                                                        71,739        (1,013,043)          512,137
                                                                  ----------------  ----------------  ----------------
Net cash used in operating activities                                  (5,402,803)       (4,629,642)       (4,902,566)
                                                                  ----------------  ----------------  ----------------

INVESTING ACTIVITIES:
Marketable securities                                                   6,826,955           912,645        10,963,363
Capital expenditures                                                      (34,292)         (418,507)         (980,709)
Other assets                                                               (1,885)          210,400           221,288
Patent expenditures                                                      (288,252)         (280,778)         (269,682)
                                                                  ----------------  ----------------  ----------------
Net cash provided from (used in) investing activities                   6,502,526           423,760         9,934,260
                                                                  ----------------  ----------------  ----------------

FINANCING ACTIVITIES:
Principal payments under capital lease obligations                       (487,702)         (506,205)         (414,176)
Proceeds from (payments on) notes payable                                (267,217)         (106,887)          641,320
Issuance of common stock, net                                           1,065,864         4,366,846           176,311
                                                                  ----------------  ----------------  ----------------
Net cash provided from financing activities                               310,945         3,753,754           403,455
                                                                  ----------------  ----------------  ----------------

NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS                    1,410,668          (452,128)        5,435,149

CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD                       12,157,149        12,609,277         7,174,128
                                                                  ----------------  ----------------  ----------------
CASH AND CASH EQUIVALENTS AT END OF PERIOD                           $ 13,567,817      $ 12,157,149      $ 12,609,277
                                                                  ----------------  ----------------  ----------------
                                                                  ----------------  ----------------  ----------------

SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Interest Paid                                                           $ 167,622         $ 184,191         $ 107,296

NONCASH INVESTING AND FINANCING ACTIVITIES:
Equipment acquired under capital leases                                 $ 348,920         $ 434,416       $ 1,200,022
</TABLE>


See accompanying notes.

                                       F-5
<PAGE>

                               VICAL INCORPORATED
                          NOTES TO FINANCIAL STATEMENTS
                               December 31, 1998

1.       SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

ORGANIZATION AND BUSINESS ACTIVITY

Vical Incorporated (the "Company"), a Delaware corporation, was incorporated 
in 1987 and has devoted substantially all of its resources since that time to 
its research and development programs. The Company is focusing its resources 
on the development of its direct gene transfer and related technologies.

All of the Company's potential products are in research and development. No 
revenues have been generated from the sale of any of such products, nor are 
any such revenues expected for at least the next several years. The products 
currently under development by the Company will require significant 
additional research and development efforts, including extensive preclinical 
and clinical testing and regulatory approval, prior to commercial use. There 
can be no assurance that the Company's research and development efforts will 
be successful and that any of the Company's potential products will prove to 
be safe and effective in clinical trials. Even if developed, these products 
may not receive regulatory approval or be successfully introduced and 
marketed at prices that would permit the Company to operate profitably. The 
Company expects to continue to incur substantial losses and not generate 
positive cash flow from operations for at least the next several years. No 
assurance can be given that the Company can generate sufficient product 
revenue to become profitable or generate positive cash flow from operations 
at all or on a sustained basis.

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 reported amounts of assets and liabilities and disclosure of 
contingent assets and liabilities at the date of the financial statements and 
the reported amounts of revenue and expenses during the reporting period. 
Actual results could differ from those estimates.

PROPERTY AND EQUIPMENT

Equipment is stated at cost and depreciated over the estimated useful lives 
of the assets (3-5 years) using the straight-line method. Leasehold 
improvements are stated at cost and amortized over the shorter of the life of 
the lease or the remaining useful life of the asset using the straight-line 
method.

PATENT COSTS

The Company capitalizes certain costs related to patent applications. 
Accumulated costs are amortized over the estimated economic lives of the 
patents using the straight-line method, commencing at the time the patents 
are issued. Costs related to patent applications are written off to expense 
at the time such costs are deemed to have no continuing value.

RESEARCH AND DEVELOPMENT COSTS

All research and development costs are expensed as incurred.

REVENUE UNDER COLLABORATIVE AGREEMENTS

Revenue under collaborative agreements is generally recognized over the term 
of the agreement or on the achievement of certain milestones. Advance 
payments received in excess of amounts earned are classified as deferred 
revenue.

NET LOSS PER SHARE

Basic and diluted net loss per share for each of the three years in the 
period ended December 31, 1998, has been computed using the weighted average 
number of shares of common stock outstanding during the periods pursuant to 
Statement of Financial Accounting Standards No. 128, "Earnings Per Share." 
Diluted loss per share does not include any stock options as the effect would 
be antidilutive. See Note 6 for information on the number of options 
outstanding and the weighted average exercise price at December 31, 1998, 
1997 and 1996.

INCOME TAXES

The Company accounts for income taxes in accordance with Statement of 
Financial Accounting Standards No. 109 ("SFAS 109"), "Accounting for Income 
Taxes."

                                       F-6
<PAGE>

FAIR VALUE OF FINANCIAL INSTRUMENTS

The carrying amounts of financial instruments such as accounts receivable, 
accounts payable and accrued expenses reasonably approximate fair value 
because of the short maturity of these items. The Company believes the 
carrying amounts of the Company's notes payable and obligations under capital 
leases approximate fair value because the interest rates on these instruments 
change with, or approximate, market interest rates.

COMPREHENSIVE INCOME

The Company has implemented Statement of Financial Accounting Standards No. 
130 ("SFAS 130"), "Reporting Comprehensive Income." This statement requires 
that all items that are required to be recognized under accounting standards 
as components of comprehensive income be reported in a financial statement 
that is displayed with the same prominence as other financial statements. 
Accordingly, in addition to reporting net income (loss) under the current 
rules, the Company was required to display the impact of any unrealized gain 
or loss on marketable securities as a component of comprehensive income and 
to display an amount representing total comprehensive income for each period 
presented. The Company has presented the required information in the 
Statements of Stockholders' Equity.

RECENT ACCOUNTING PRONOUNCEMENTS

In March 1998, the Accounting Standards Executive Committee issued AICPA 
Statement of Position 98-1, "Accounting for the Costs of Computer Software 
Developed or Obtained for Internal Use" ("SOP 98-1"). This statement provides 
guidance on accounting for the costs of computer software developed or 
obtained for internal use. The statement identifies characteristics of 
internal use software and assists in determining when computer software is 
for internal use. SOP 98-1 is effective for fiscal years beginning after 
December 15, 1998, with earlier application permitted. The Company has not 
determined the impact of the adoption of SOP 98-1 as this is highly dependent 
upon the nature, timing and extent of future internal use software 
development.

The Company has adopted Statement of Financial Accounting Standards No. 131, 
"Disclosures about Segments of an Enterprise and Related Information" and, 
has determined that it operates in one business segment dedicated to research 
in gene delivery technology.

2.       CASH EQUIVALENTS AND MARKETABLE SECURITIES

The Company invests its excess cash in debt instruments of financial 
institutions, corporations with strong credit ratings, and in U.S. government 
obligations. The Company has established guidelines relative to 
diversification and maturities that maintain safety and liquidity. These 
guidelines are periodically reviewed and modified to take advantage of trends 
in yields and interest rates. Cash equivalents are short-term, highly liquid 
investments with original maturities of less than three months. Cash 
equivalents at December 31, 1998 and 1997, consist primarily of $11,671,743 
and $12,080,473, respectively, in commercial paper, federal agency discount 
notes and money market funds.

The Company has adopted Statement of Financial Accounting Standards No. 115 
("SFAS 115"), "Accounting for Certain Investments in Debt and Equity 
Securities," which requires that the Company's marketable securities be 
classified as available-for-sale and that unrealized holding gains or losses 
are recorded as a separate component of stockholders' equity. Realized gains 
or losses, calculated based on the specific identification method, were not 
material for the years ended December 31, 1998, 1997 and 1996.

At December 31, 1998, marketable securities consisted of the following:

<TABLE>
<CAPTION>
                                                   Amortized Cost       Market Value      Unrealized Gain
                                                   --------------       ------------      ---------------
<S>                                                <C>                  <C>               <C>
       U.S. Government Obligations                   $ 5,508,897        $ 5,529,915           $21,018
       Commercial Paper                               21,037,602         21,086,024            48,422
                                                     -----------        -----------           -------
       Total Marketable Securities                   $26,546,499        $26,615,939           $69,440
                                                     ===========        ===========           =======
</TABLE>

Approximately 60%, 36% and 4% of these securities mature within one, two and 
three years, respectively, of December 31, 1998.

                                       F-7
<PAGE>

At December 31, 1997, marketable securities consisted of the following:

<TABLE>
<CAPTION>
                                                   Amortized Cost       Market Value      Unrealized Gain
                                                   --------------       ------------      ---------------
<S>                                                <C>                  <C>               <C>
       U.S. Government Obligations                   $12,978,062        $12,982,090             $ 4,028
       Commercial Paper                               20,395,392         20,415,392              20,000
                                                     -----------        -----------             -------
       Total Marketable Securities                   $33,373,454        $33,397,482             $24,028
                                                     -----------        -----------             -------
                                                     -----------        -----------             -------
</TABLE>

3.       SIGNIFICANT CONTRACTS AND LICENSE AGREEMENTS

MERCK & CO., INC.

The Company has entered into three separate agreements with Merck & Co., Inc. 
("Merck") which provide Merck with certain exclusive rights to develop and 
commercialize vaccines using the Company's "naked" DNA technology for certain 
disease targets. The 1991 and 1997 agreements are for human vaccine targets 
and the 1992 agreement is for animal vaccine targets. Prior to 1996, Merck 
exercised its options to seven preventive human infectious disease vaccines 
using the Company's naked DNA technology pursuant to the 1991 agreement. In 
1996, the Company received a $1,000,000 payment from Merck upon the 
initiation of a Phase I clinical trial of an experimental DNA vaccine against 
influenza virus, one of the seven infectious disease targets covered by the 
agreement. Also in 1996, Vical accrued a $500,000 payment from Merck in 
conjunction with the issuance of the patent technology covering the 
agreement. The payment was subsequently received in 1997. In November 1997, 
the Company and Merck amended the 1991 agreement and granted Merck certain 
rights to develop and market therapeutic vaccines against the human 
immunodeficiency virus (HIV) and hepatitis B virus (HBV). Under the amended 
agreement, Merck made an investment of $5,000,000 for approximately 262,000 
shares of the Company's common stock including a twenty-five percent premium 
over the average per share closing price for the twenty trading days prior to 
the date of the agreement. The premium of $1,000,000 on the investment was 
reflected in revenue in 1997 and the balance of the investment, net of costs 
to issue the shares of stock, was reflected in common stock and additional 
paid-in capital.

The September 1997 agreement between the Company and Merck granted Merck the 
rights to use the Company's naked DNA technology to deliver certain growth 
factors as potential treatments for a range of applications including 
revascularization. The agreement resulted in an initial payment to the 
Company of $2,000,000. Through December 31, 1998, the Company had received a 
total of $19,130,000 (including the payment for the investment for common 
stock) under these agreements of which $0, $3,000,000, and $1,500,000 was 
recognized as revenue in 1998, 1997, and 1996, respectively. All three 
agreements provide for the Company to receive additional payments based upon 
achievement of certain defined milestones and royalty payments based on net 
product sales.

PASTEUR MERIEUX CONNAUGHT

In September 1994, the Company entered into an agreement with Pasteur Merieux 
Connaught ("PMC") that includes a research collaboration and options for PMC 
to take exclusive licenses to Vical's naked DNA vaccine technology for each 
of five vaccine targets. In order to maintain the options, PMC will be 
required to pay Vical option fees as specified in the agreement. In addition, 
Vical was paid an annual research fee through September 1997 by PMC for 
expenses incurred in performing certain preclinical work as defined in the 
agreement. PMC renewed options and exercised an option in 1995. In 1996, PMC 
exercised three options, extended one option, and added a new option. In 
1997, PMC paid the Company $1,000,000 as a milestone payment under the 
agreement because the Company and PMC began a Phase I clinical trial of an 
experimental vaccine against the parasite that causes malaria. The Company 
and PMC are sponsoring the trial which is being conducted by the U.S. Naval 
Medical Research Institute and the U.S. Army Medical Research Institute of 
Infectious Diseases. Through December 31, 1998, Vical has received $7,816,000 
of which $239,000, $2,399,000, and $2,746,000, was recognized as revenue in 
1998, 1997, and 1996, respectively. The agreement provides for the Company to 
receive additional payments based upon achievement of certain defined 
milestones and royalty payments based on net product sales.

RHONE-POULENC RORER PHARMACEUTICALS, INC.

In October 1997, the Company and Rhone-Poulenc Rorer Pharmaceuticals. Inc. 
("RPR") entered into an agreement granting RPR an exclusive worldwide license 
to use the Company's naked DNA gene delivery technology to develop certain 
gene therapy products for potential treatment of neurodegenerative diseases. 
Under the terms of the agreement, the Company received $1,000,000 which was 
recognized as revenue in 1997. This agreement provides for the Company to 
receive additional payments based upon achievement of certain defined 
milestones and royalty payments based on net product sales.

CENTOCOR, INC.

In February 1998, the Company signed an agreement allowing Centocor, Inc. 
("Centocor") to use Vical's naked DNA technology to develop and market 
gene-based vaccines for the potential treatment of certain types of cancer. 
The agreement 

                                       F-8
<PAGE>

resulted in a payment to Vical of $2,200,000, which was recognized as revenue 
in 1998. The payment represented an initial payment of $2,000,000 under the 
license agreement and reimbursement of $200,000 of patent costs. The Company 
may receive further payments plus royalties if Centocor successfully develops 
products using the Vical technology. The agreement grants to Centocor 
exclusive worldwide licenses and options to license Vical's naked DNA 
technology to deliver certain antigens to induce immune responses against the 
associated cancer cells.

BOSTON SCIENTIFIC CORPORATION

In September 1998, the Company and Boston Scientific Corporation entered into 
a license and option agreement for the development of catheter-based 
intravascular gene delivery technology. The Company received $1,100,000 which 
was recognized as revenue in 1998. The agreement also provides for the 
Company to receive royalty payments on net product sales.

NAVAL MEDICAL RESEARCH INSTITUTE

In September 1998, the Company signed a cooperative agreement with the Office 
of Naval Research for funding of up to $2,700,000 to develop a multi-gene 
malaria DNA vaccine and test its ability to protect humans against malaria. 
The Company recognized $697,000 of contract revenue under this agreement in 
1998.

OTHER RESEARCH AND LICENSING AGREEMENTS

The Company also received revenue under research and licensing agreements 
with other entities including the U.S. government of which approximately 
$1,585,000, $1,404,000, and $2,494,000, was recognized as revenue during the 
years ended December 31, 1998, 1997, and 1996, respectively. Included in 
these amounts is revenue recognized for a corporate alliance entered into in 
March 1995 relating to DNA vaccines in the animal health area with Merial (a 
joint venture between Merck and Rhone Merieux), a leading manufacturer and 
marketer of animal health products worldwide. The agreement includes options 
for Merial to take exclusive licenses to Vical's naked DNA vaccine technology 
and the cytofectin technology to develop and commercialize certain gene-based 
products for use in the prevention of infectious diseases in domesticated 
animals. In 1996, the agreement was extended to March 1998. In 1997, a patent 
milestone payment was made to the Company pursuant to the agreement. In 1998 
a payment was made to the Company and the agreement was extended to March 
1999. If Merial exercises its license options, cash payments and royalties on 
net sales would be due to the Company.

In 1996, the Company received $1,100,000 and recognized revenue of 
$1,300,000, under a 1993 agreement with Genzyme Corporation . This agreement 
was for the exercise of an option to obtain exclusive worldwide license 
rights related to the use of the Company's lipid technology in the treatment 
of cystic fibrosis. No cash was received and no revenue was recognized under 
this agreement in 1998 or 1997. Under a U.S. government agreement that 
commenced in the first quarter of 1996 and ended June 30, 1997, the Company 
and the Naval Medical Research Institute were awarded a grant that provided 
$1,000,000 to support further development of a malaria vaccine based on 
Vical's naked DNA vaccine technology. In December 1996, the Company also 
recognized $92,000 of revenue under an agreement which expired in December 
1996 with Baxter International, Inc.

Under separate agreements, the Company is obligated to pay third parties 10 
percent of certain payments received by the Company under the Merck, PMC, 
RPR, Merial, Centocor, Boston Scientific Corporation and Pfizer, Inc. (see 
"Note 10-Subsequent Event") agreements.

4.       OTHER FINANCIAL DATA

Accounts payable and accrued expenses consisted of the following at December 
31, 1998 and 1997:

<TABLE>
<CAPTION>
                                                  1998                 1997
                                                  ----                 ----
<S>                                         <C>                  <C>
          Employee compensation               $692,716             $678,588
          Accounts payable                     768,796              327,617
          Accrued clinical trials costs        492,914              310,891
          Other accrued liabilities            326,826              107,507
                                            ----------           ----------
                                            $2,281,252           $1,424,603
                                            ----------           ----------
                                            ----------           ----------
</TABLE>

                                       F-9
<PAGE>

5.       COMMITMENTS

LEASES

The Company leases its office and research facilities and certain equipment 
under operating and capital leases. The minimum annual rents on the office 
and research facilities are subject to increases based on changes in the 
Consumer Price Index subject to certain minimum and maximum annual increases. 
The Company is also required to pay taxes, insurance and operating costs 
under the facilities leases. The equipment capital leases are secured by 
substantially all equipment of the Company.

<TABLE>
<CAPTION>
                                                   Operating Leases       Capital Leases
                                                   ----------------       --------------
<S>                                                <C>                    <C>
                Years ended December 31,
                          1999                           $1,076,700             $566,014
                          2000                              460,788              538,482
                          2001                              116,241              186,781
                          2002                                    -               84,896
                          2003                                    -                    -
                                                   ----------------       --------------
           Total minimum lease payments                  $1,653,729            1,376,173
                                                   ----------------
                                                   ----------------
           Less amount representing
               interest                                                         (154,900)
                                                                          --------------
           Present value of capital
               lease payments                                                  1,221,273
           Less current portion                                                 (473,466)
                                                                          --------------
           Long-term obligations under
               capital leases                                                   $747,807
                                                                          --------------
                                                                          --------------
</TABLE>

Rent expense for the years ended December 31, 1998, 1997, and 1996, was 
$998,195, $969,899, and $807,713, respectively.

Cost and accumulated depreciation of equipment under capital leases were as 
follows:

<TABLE>
<CAPTION>
                                                                  Accumulated
                                                       Cost       Depreciation       Net
                                                       ----       ------------       ---
<S>                                                 <C>           <C>             <C>
               December 31, 1998                    $2,163,877      $1,109,781    $1,054,096

               December 31, 1997                     2,312,876       1,066,488     1,246,388
</TABLE>

NOTES PAYABLE

The Company has a term loan which bears interest at the bank's prime rate 
(8.25% at December 31, 1998) plus .5%, or the Company may alternatively 
choose to have its borrowings bear interest at the LIBOR rate plus 3.25%. The 
term loan is secured by any Company deposits at the bank, however, the 
Company is not required to, and does not, maintain any deposits at the bank. 
The term loan has a fifteen-month remaining amortization period. At December 
31, 1998, the loan balance was $267,216, including $213,773 reflected in 
current liabilities.

RESEARCH AND LICENSE AGREEMENTS

In 1998 and 1997, the Company continued research and exclusive license 
agreements with various universities for continuing research and license 
rights to technology related to gene therapy. The agreements generally grant 
the Company the right to commercialize any product derived from specified 
technology. Fees paid and future obligations on these agreements are not 
significant.

                                       F-10
<PAGE>

6.       STOCKHOLDERS' EQUITY

PREFERRED STOCK

The Company's certificate of incorporation, as amended, authorizes the 
issuance of up to 5,000,000 preferred shares. No shares of preferred stock 
were outstanding at December 31, 1998 or 1997.

COMMON STOCK

The Company's certificate of incorporation, as amended, authorizes the 
issuance of up to 40,000,000 common shares. Common stock shares totaling 
15,866,544, and 15,731,316 were outstanding at December 31, 1998 and 1997, 
respectively.

STOCK PLAN AND DIRECTORS OPTION PLAN

The Company has a stock plan ("Stock Incentive Plan of Vical Incorporated") 
under which 2,450,000 shares of common stock are reserved for issuance to 
employees, non-employee directors and consultants of the Company. The plan 
provides for the grant of incentive and nonstatutory stock options and the 
direct award or sale of shares. The exercise price of stock options must 
equal at least the fair market value on the date of grant. The maximum term 
of options granted under the plan is ten years. Except for annual grants to 
directors which vest at the next annual meeting, options generally vest 25% 
on the first anniversary of the date of grant, with the balance vesting 
quarterly over the remaining three years. The plan has also limited the 
number of options that may be granted to any plan participant in a single 
calendar year to 300,000 shares.

The Company also has a directors stock option plan ("Directors Plan") that 
provides for the issuance to non-employee directors of up to 210,000 shares 
of the Company's common stock, of which options for 202,500 shares have been 
granted. The initial grant to a director of options under this plan generally 
vests 25% on the first anniversary of the date of grant, with the balance 
vesting quarterly over the remaining three years. In 1997, the stockholders 
approved an amendment to the Stock Incentive Plan of Vical Incorporated 
allowing non-employee directors to receive grants under that plan and, 
accordingly, it is not anticipated that there will be any future grants under 
the Directors Plan.







                                       F-11
<PAGE>

The following table summarizes stock option transactions for the Company's 
stock option plans for the years ended December 31, 1998, 1997 and 1996:

<TABLE>
<CAPTION>
                                                                 Weighted Ave.           Weighted Ave.
                                                  Shares        Exercise Price      Fair Value of Grants
                                                  ------        --------------      ---------------------
<S>                                              <C>            <C>                 <C>
Outstanding,
December 31, 1995                                 749,912             $7.60

Granted                                           456,350            $15.99                $11.95
Exercised                                        (32,317)             $5.48
Forfeited                                        (14,264)            $10.97
                                                ---------
Outstanding,
December 31, 1996                               1,159,681            $10.92

Granted                                           403,845            $14.14                $10.17
Exercised                                        (72,922)            $ 5.10
Forfeited                                        (48,106)            $13.25
                                                ---------
Outstanding,
December 31, 1997                               1,442,498            $12.04

Granted                                           580,875            $15.56                $11.12
Exercised                                       (135,228)              7.88
Forfeited                                        (73,100)             13.99
                                                ---------
Outstanding,
December 31, 1998                               1,815,045            $13.39
                                                ---------            ------
                                                ---------            ------
</TABLE>

The following table summarizes information about stock options outstanding 
under the Company's stock option plans at December 31, 1998:

<TABLE>
<CAPTION>
                                Options Outstanding                                       Options Exercisable
- -------------------------------------------------------------------------------   ------------------------------------
                                               Weighted             Weighted 
                            Number              Average             Average            Number             Weighted
       Range of          Outstanding           Remaining            Exercise        Exercisable            Average
   Exercise Prices      As of 12/31/98     Contractual Life          Price         As of 12/31/98      Exercise Price
- -------------------------------------------------------------------------------   ------------------------------------
<S>                     <C>                <C>                    <C>             <C>                  <C>
$0.1600 - $13.2500             457,284                  6.1             $7.50              376,850               $6.75
$13.3750 - $15.0000            455,050                  7.8            $14.00              241,363              $13.82
$15.1875 - $15.5000            582,238                  9.1            $15.36               96,838              $15.20
$15.6250 - $20.5000            320,473                  8.5            $17.40              129,778              $18.39
                        ---------------                                           -----------------
$0.1600 - $20.5000           1,815,045                  7.9            $13.39              844,829              $11.53
</TABLE>

The number of shares and weighted average price of options exercisable at 
December 31, 1998, 1997 and 1996 were 844,829 shares at $11.53, 688,126 
shares at $9.90, and 487,750 shares at $6.82, respectively.

                                       F-12
<PAGE>

The Company has adopted the disclosure-only provisions of SFAS 123. 
Accordingly, no compensation cost has been recognized for the stock option 
plans. Had compensation cost for the Company's stock option plans been 
determined consistent with the provisions of SFAS 123, the Company's net loss 
and loss per share would have increased to the pro forma amounts indicated 
below:

<TABLE>
<CAPTION>
                                                1998             1997            1996
                                                ----             ----            ----
<S>                                         <C>              <C>              <C>
    Net loss - as reported                    $7,480,507      $5,611,231       $5,080,591
    Net loss - pro forma                     $11,645,607      $8,878,712       $6,497,447
    Net loss per share - as reported                $.47            $.36             $.33
    Net loss per share - pro forma                  $.74            $.57             $.42
</TABLE>

The fair value of each option grant was estimated on the date of grant using 
the Black-Scholes option-pricing model with the following weighted average 
assumptions used for grants: risk free interest rates of 5.09% (1998), 5.99% 
(1997) and 6.57% (1996) and, expected volatility of 71% (1998), 70% (1997) 
and 74% (1996). An expected option life of 5 years and a dividend rate of 
zero is assumed for all years presented.

Because SFAS 123 has not been applied to options granted prior to January 1, 
1995, the resulting pro forma compensation cost may not be representative of 
that to be expected in future years.

7.       RELATED PARTIES

Included in other assets at December 31, 1998 and 1997, is the long-term 
portion of notes receivable, representing amounts due from certain officers 
and employees of the Company. Imputed interest is applied at the applicable 
federal rate. The loan agreements allow for the notes to be forgiven under 
certain circumstances over the next three years. The long-term portion is 
$60,000 and $25,000 at December 31, 1998 and 1997, respectively. The current 
portion, included in receivables and other, is $55,000 and $25,000 at 
December 31, 1998 and 1997, respectively.

8.       INCOME TAXES

As of December 31, 1998, the Company has available net operating loss 
carryforwards of approximately $36,700,000 and research and development 
credit carryforwards of approximately $1,700,000 to reduce future federal 
income taxes, if any. These carryforwards expire through 2018 and are subject 
to review and possible adjustment by the Internal Revenue Service.

The Tax Reform Act of 1986 limits a company's ability to utilize certain net 
operating loss and tax carryforwards in the event of cumulative change in 
ownership in excess of 50%, as defined. The Company has completed numerous 
financings that have resulted in a change in ownership in excess of 50%, as 
defined. The utilization of net operating loss and tax credit carryforwards 
may be limited due to these ownership changes.

The Company has a deferred tax asset of approximately $17,400,000 related 
primarily to its net operating loss and tax credit carryforwards. A valuation 
allowance has been recognized to offset the entire amount of the deferred tax 
asset as realization of such asset is uncertain.

9.       EMPLOYEE BENEFIT PLANS

The Company has a defined contribution savings plan under section 401(k) of 
the Internal Revenue Code. The plan covers substantially all employees. The 
Company matches employee contributions made to the plan according to a 
specified formula. The Company's matching contributions totaled approximately 
$95,000, $94,000, and $78,000, in 1998, 1997, and 1996, respectively.

10.      SUBSEQUENT EVENT

In January 1999, Pfizer Inc. entered into a license and option agreement and 
a stock purchase agreement with the Company. Under the terms of the 
agreements Pfizer Inc. paid the Company $1,000,000 in license fees and 
$6,000,000 for the purchase of approximately 318,000 shares of common stock 
at $18.87 per share, reflecting a 25% premium. The license fee and the 
$1,200,000 premium on the purchase of stock will be recognized as revenue in 
1999, and the balance of the common stock investment, net of any cost to 
issue the shares of stock, will be reflected in common stock and additional 
paid-in capital in 1999.

                                       F-13
<PAGE>

11.      SUMMARY OF UNAUDITED QUARTERLY FINANCIAL INFORMATION

The following is a summary of the unaudited quarterly results of operations 
for the years ended December 31, 1998 and 1997 (in thousands, except per 
share amounts):

<TABLE>
<CAPTION>
                                                                   Quarter Ended
                                            March 31          June 30         September 30          December 31
                                            --------          -------         ------------          -----------
<S>                                        <C>              <C>              <C>                 <C>
1998
Revenues                                     $  2,732         $    560            $   1,696            $     932
Research and development costs                  3,095            3,058                3,158                2,743
Total operating costs and
   expenses                                     4,062            4,072                4,012                3,558
Net loss                                         (721)          (2,935)              (1,750)              (2,075)
Net loss per common
   share (basic and diluted)                     (.05)            (.19)                (.11)                (.13)
Shares used in per share
   calculation                                 15,753           15,789               15,817               15,892

<CAPTION>
                                            March 31          June 30         September 30          December 31
                                            --------          -------         ------------          -----------
<S>                                        <C>              <C>              <C>                 <C>
1997
Revenues                                     $  1,126         $    867            $   3,480            $   2,330
Research and development costs                  2,794            2,797                3,319                3,026
Total operating costs and
   expenses                                     3,691            3,678                4,247                4,054
Net loss                                       (2,002)          (2,267)                (225)              (1,117)
Net loss per common
   share (basic and diluted)                     (.13)            (.15)                (.01)                (.07)
Shares used in per share
   calculation                                 15,423           15,448               15,458               15,609
</TABLE>

                                       F-14

<PAGE>

                                                                   EXHIBIT 23.1


                 CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS

         As independent public accountants, we hereby consent to the 
incorporation of our report included in this Form 10-K into Vical 
Incorporated's previously filed Registration Statements Files No. 33-60826, 
No. 33-60824, No. 33-81602, No. 33-81600, No. 33-87972 and 333-30181.



                                                           ARTHUR ANDERSEN LLP

San Diego, California
February 8, 1999

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE BALANCE
SHEETS AND STATEMENTS OF OPERATIONS OF THE COMPANY'S FORM 10-K FOR THE YEAR
ENDED DECEMBER 31, 1998, AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               DEC-31-1998
<CASH>                                          13,568
<SECURITIES>                                    26,616
<RECEIVABLES>                                      477
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                                41,616
<PP&E>                                           6,698
<DEPRECIATION>                                   4,992
<TOTAL-ASSETS>                                  44,844
<CURRENT-LIABILITIES>                            3,218
<BONDS>                                            801
                                0
                                          0
<COMMON>                                           159
<OTHER-SE>                                      40,665
<TOTAL-LIABILITY-AND-EQUITY>                    44,844
<SALES>                                              0
<TOTAL-REVENUES>                                 5,920
<CGS>                                                0
<TOTAL-COSTS>                                        0
<OTHER-EXPENSES>                                12,054
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 162
<INCOME-PRETAX>                                (7,481)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                            (7,481)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   (7,481)
<EPS-PRIMARY>                                    (.47)
<EPS-DILUTED>                                    (.47)
        

</TABLE>


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