COR THERAPEUTICS INC / DE
10-K, 1999-03-25
PHARMACEUTICAL PREPARATIONS
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 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

[ ]     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: 0-19290
                             COR THERAPEUTICS, INC.
             (Exact name of Registrant as specified in its charter)
                                    DELAWARE
         (State or other jurisdiction of incorporation or organization)
                                   94-3060271
                      (I.R.S. employer identification no.)
                                 (650) 244-6800
              (Registrant's telephone number, including area code)
          256 EAST GRAND AVENUE, SOUTH SAN FRANCISCO, CALIFORNIA 94080
             (Address of principal executive offices and zip code)

Securities registered pursuant to Section 12(b) of the Act: None

Securities registered pursuant to Section 12(g) of the Act: 
Common Stock, $.0001 Par Value
- ------------------------------
Preferred Share Purchase Rights
- -------------------------------

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]

As of March 1, 1999, the aggregate market value (based upon the closing sales
price of such stock as reported in the Nasdaq National Market on such date) of
the voting stock held by non-affiliates of the Registrant was $171,862,185.
(Excludes 7,079,922 shares outstanding at March 1, 1999 of the Registrant's
Common Stock held by directors, executive officers and holders of more than 5%
of the Company's Common Stock. Exclusion of shares held by any person should not
be construed to indicate that such person possesses the power, direct or
indirect, to direct or cause the direction of the management or policies of the
Registrant, or that such person is controlled by or under common control with
the Registrant.)

As of March 1, 1999, the number of outstanding shares of the Registrants' Common
Stock was 24,474,880.

                      DOCUMENTS INCORPORATED BY REFERENCE:

<TABLE>
<CAPTION>
Reference                                      Document                                               Form 10-K
- ---------                                      --------                                               ---------
<S>           <C>                                                                                     <C>

   (1)        Portions of the Registrant's definitive proxy statement with respect to the              Part III
              Registrant's 1999 Annual Meeting of Stockholders, to be filed with the
              Securities and Exchange Commission not later than 120 days after the close
              of the Registrant's fiscal year.
</TABLE>



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                                     PART I

ITEM 1.  BUSINESS

Except for the historical information contained herein, the following discussion
contains forward-looking statements that involve risks and uncertainties. COR
Therapeutics, Inc.'s actual results could differ materially from those discussed
herein. Factors that could cause or contribute to such differences include, but
are not limited to, those discussed below and in the sections entitled
"Additional Risk Factors" and "Management's Discussion and Analysis of Financial
Condition and Results of Operations." INTEGRILIN(TM) (eptifibatide) Injection
and COR(TM) are trademarks of COR Therapeutics, Inc.



GENERAL

COR Therapeutics, Inc. ("COR" or the "Company") was incorporated in Delaware on
February 4, 1988. COR is dedicated to the discovery, development and
commercialization of novel pharmaceutical products to establish new standards of
care for the treatment and prevention of severe cardiovascular diseases. COR has
complementary research and development programs that seek to address critical
needs in cardiovascular diseases, including unstable angina, acute myocardial
infarction, venous thrombosis and restenosis. In addition to INTEGRILIN, COR has
developed a portfolio of cardiovascular product candidates and programs by
combining its expertise with advanced drug discovery techniques.

INTEGRILIN is the first product that COR has taken from discovery to
commercialization. INTEGRILIN was approved for marketing in the United States by
the U.S. Food and Drug Administration ("FDA") in May 1998. INTEGRILIN is
indicated for the treatment of patients with acute coronary syndrome or "ACS"
(encompassing unstable angina and non-Q-wave myocardial infarction, collectively
"UA/NQMI") including patients who are to be managed medically and those
undergoing percutaneous coronary intervention ("PCI.") INTEGRILIN is also
indicated for the treatment of patients undergoing PCI.

COR and Schering-Plough Ltd. and Schering Corporation (collectively, "Schering")
are worldwide partners for INTEGRILIN. COR and Schering co-promote the drug in
the United States and share any profits or losses. COR and Schering launched
INTEGRILIN in June 1998 in the United States. See "Marketing and Sales
Strategy."

Schering has the right to launch INTEGRILIN in the European Union ("EU") as an
exclusive licensee on a royalty-bearing basis for a period of time. In February
1999, Schering announced that the Committee for Proprietary Medicinal Products
("CPMP") of the European Agency for the Evaluation of Medicinal Products issued
a positive opinion recommending approval of INTEGRILIN for the prevention of
myocardial infarction in patients presenting with UA/NQMI. The CPMP opinion
serves as the basis for a European Commission approval, which is typically
issued in approximately four months. The Company believes that the Commission
approval of the centralized Marketing Authorization application for INTEGRILIN
would result in a single Marketing Authorization with unified labeling that
would be valid in all 15 European Union member states. Schering submitted the
centralized Marketing Application in February 1998. INTEGRILIN has received
regulatory approval in a number of countries outside the EU and the United
States.

COR and Schering are conducting or have conducted Phase II clinical trials of
INTEGRILIN with different thrombolytics in the setting of acute myocardial
infarction. COR and Schering also sponsor additional clinical trials of
INTEGRILIN in a variety of clinical settings.

In addition to its commercial activities, COR continues to pursue a wide array
of research and development programs. The Company's next potential product is an
oral glycoprotein IIb-IIIa ("GP IIb-IIIa") inhibitor to prevent platelet
aggregation. Results to date of Phase I and initial Phase II studies for the
Company's lead compound, cromafiban, show that it has high affinity and
specificity for GP IIb-IIIa. Inhibition of platelet aggregation by cromafiban
has been shown to be dose- and concentration-dependent. Plasma concentrations
have indicated a sufficiently long elimination half-life to allow for once-daily
dosing with a low peak-to-trough ratio and low inter-patient variability. No
food interactions have been observed. Bleeding was the most prevalent
complication



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encountered during cromafiban therapy in clinical trials conducted to date. COR
is also conducting preclinical research and development in several other
cardiovascular programs.



STRATEGY

- -    Maximize the Revenue Potential of INTEGRILIN(TM) (eptifibatide) Injection.
     COR has established a dedicated cardiovascular sales force to promote
     INTEGRILIN by educating the medical community about GP IIb-IIIa therapy and
     marketing the use of INTEGRILIN in such therapy. COR is also pursuing a
     development program that expands the use of INTEGRILIN into additional
     indications and geographies.

- -    Maintain Cardiovascular Disease Focus. Cardiovascular disease is the
     leading cause of death in the United States. COR believes that by combining
     its extensive knowledge of the molecular and cellular biology of
     cardiovascular diseases with advanced drug discovery techniques, it can
     develop new therapeutics to address large, unmet market opportunities.

- -    Maximize Value of Strategic Collaborations. COR will continue to seek out
     strategic collaborations that provide: (i) access to new and strategic
     therapeutics and technologies, (ii) attractive financial terms to offset
     internal research and development expenses and (iii) access to
     international marketing, sales and distribution capabilities.

- -    Continue to Build Relationships with Leading Clinicians and Scientists. COR
     has conducted its clinical trials at premier academic and clinical centers
     under the supervision of many of the world's leading cardiologists. COR
     builds strong relationships with prominent scientists and clinical
     cardiologists by sponsoring and conducting research and providing for
     increased exposure to its product candidates in the medical community.



THERAPEUTIC OPPORTUNITIES IN CARDIOVASCULAR DISEASE

Despite decades of extensive research and development and significant advances
in treatment, cardiovascular disease remains the leading cause of death in the
United States. Approximately one million people die each year from heart
attacks, strokes and related diseases. As the number of elderly people in the
population increases, the number of deaths attributable to these diseases
continues to climb. COR has focused its research and development efforts on
agents that have the potential to prevent and/or treat these diseases. In
particular, COR has targeted the diseases of arterial thrombosis, venous
thrombosis and restenosis.

In arterial thrombosis, an aggregation of platelets (a thrombus, essentially a
plug) forms on the lining of an injured artery. The thrombus occludes the artery
and thereby impairs its ability to supply oxygen to the heart, brain and other
organs. In the heart, disorders from arterial thrombosis range from prolonged
episodes of severe chest pain (including unstable angina) to heart attack (acute
myocardial infarction) to sudden death. In the brain, disorders range from a
temporary reduction in oxygen supply to stroke. Each year, approximately six
million people suffer from severe chest pain, one million from heart attack and
600,000 from stroke.

In venous thrombosis, disorders are not generally related to occlusion but
rather to the breaking-off or embolization of the thrombus from its attachment
site. The broken-off thrombus can travel to the lungs and cause a pulmonary
embolism, a serious disorder in which blood supply is blocked and lung tissue is
killed. Each year, over 270,000 patients are diagnosed with venous thrombosis.
Approximately 50,000 patients die annually from pulmonary embolisms.

In restenosis, an artery significantly re-narrows following an angioplasty
procedure, usually within 6 months. Approximately 500,000 patients undergo
angioplasties each year and up to 40% suffer from restenosis. Restenosis rates
have declined recently with the acceptance of coronary stenting to accompany
angioplasty, but stenting itself can be



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complicated by restenosis, particularly in smaller vessels. Restenosis therefore
remains a threat whether or not stents are deployed.



INTEGRILIN(TM) (EPTIFIBATIDE) INJECTION

INTEGRILIN is a small synthetic peptide that blocks the platelet receptor GP
IIb-IIIa to inhibit platelet aggregation. By blocking GP IIb-IIIa, INTEGRILIN
helps prevent thrombus formations from fully occluding coronary arteries, a
situation that can lead to heart attack or death in patients with ACS or
patients undergoing PCI. Importantly, the effects of INTEGRILIN are specific to
platelets, thereby avoiding interference with other normal cardiovascular
processes. Additionally, the effects of INTEGRILIN can be reversed once therapy
with INTEGRILIN is discontinued. Over one million people in the United States
annually are candidates for INTEGRILIN therapy.

INTEGRILIN has the broadest range of indications among GP IIb-IIIa inhibitors
approved for marketing in the United States. INTEGRILIN can be administered at
the time of diagnosis in the emergency department to patients with ACS
regardless of whether they are medically managed or ultimately undergo PCI on
INTEGRILIN therapy. INTEGRILIN can be administered to patients prior to (but not
during) coronary artery bypass grafting surgery. Additionally, INTEGRILIN can
also be administered at the time of PCI to patients who undergo elective,
emergency or urgent PCI.

Contraindications include, but are not limited to, a history of bleeding
diathesis or stroke, evidence of abnormal bleeding within the previous 30 days,
recent major surgery or concomitant use of another parenteral GP IIb-IIIa
inhibitor.

Bleeding is the most common complication encountered during INTEGRILIN therapy.
The majority of excess major-bleeding events were localized at the femoral
artery access site. Oropharyngeal, genitourinary, gastrointestinal and
retroperitoneal bleeding were seen more commonly with INTEGRILIN compared with
placebo.

A competing product, abciximab, is used primarily in the catheterization
laboratory setting in patients undergoing PCI. Another competing product,
tirofiban, is used primarily in the setting of ACS. See "Competition."

INTEGRILIN was studied in two randomized, double-blind, placebo-controlled Phase
III clinical trials: the PURSUIT trial and the IMPACT II trial. PURSUIT was the
largest clinical study ever conducted of patients with UA/NQMI and the largest
study ever conducted with a GP IIb-IIIa inhibitor. PURSUIT's results were
published in August 1998 in The New England Journal of Medicine.

Commercialization of INTEGRILIN

COR and Schering launched INTEGRILIN in June 1998 in the United States. COR and
Schering are worldwide partners for INTEGRILIN. COR and Schering co-promote the
drug in the United States and share any profits or losses. In Europe, Schering
has the right to launch the product as an exclusive licensee on a
royalty-bearing basis for a period of time. See "Collaboration Agreements -
Collaboration Agreement with Schering-Plough Ltd. and Schering Corporation."

The Company's marketing strategy for INTEGRILIN is to encourage early use of
INTEGRILIN in patients with ACS and in patients undergoing PCI. COR believes
that INTEGRILIN sales will increase as early usage becomes more common and as
the number of hospitals stocking INTEGRILIN increases. COR and Schering have
identified over 2,000 hospitals as initial potential users of INTEGRILIN. Over
1,100 of these hospitals currently stock or use INTEGRILIN.

COR and Schering have each established cardiovascular sales forces to educate
the medical community about GP IIb-IIIa therapy and to market the use of
INTEGRILIN in such therapy. COR focuses its selling efforts for INTEGRILIN on
clinical cardiologists, interventional cardiologists and emergency medicine
physicians. The Company also focuses on hospital pharmacy directors, formulary
committee members, hospital administrators and nurses, all of whom might affect
purchasing decisions. See "Marketing and Sales Strategy."



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<PAGE>   5



RESEARCH AND DEVELOPMENT PROGRAMS

Pipeline

The following table summarizes information about the Company's primary research
and development programs. For further information, see the more detailed
descriptions of these programs elsewhere in this Report.

<TABLE>
<CAPTION>
Potential Product/Program                    Indication                               Status
- ---------------------------------------      ----------------------------------       ------------------------
<S>                                          <C>                                      <C>
Oral GP IIb-IIIa Inhibitor (cromafiban)      ACS and Stroke                           Phase II Clinical Trials
Factor Xa Inhibitor                          Venous Thrombosis                        Preclinical
Growth Factor Inhibitor(1)                   Restenosis                               Preclinical
Thrombin Receptor Inhibitor                  ACS, Restenosis, Stroke Prevention       Research
Platelet ADP Receptor                        ACS, Restenosis, Stroke Prevention       Research
Myocardial Signal Transduction               Congestive Heart Failure                 Research
Integrin Signaling                           Multiple                                 Research
</TABLE>

(1)     This program is being pursued in collaboration with Kyowa Hakko Kogyo
        Co., Ltd. See "Collaboration Agreements - Relationship with Kyowa Hakko
        Kogyo Co., Ltd."

Oral GP IIb-IIIa Inhibitor Product Candidate

Current therapies aimed at preventing arterial thrombosis either do not address
the underlying cause of thrombosis (namely, platelet aggregation) and/or are
severely limited in their ability to fight thrombosis. Agents such as beta
blockers, calcium antagonists, warfarin sodium and nitrates all inhibit platelet
aggregation, but through secondary processes and only under the careful
supervision of a monitoring physician. Agents such as aspirin, ticlopidine and
clopidigrel, on the other hand, do not require much supervision, but are
relatively weak inhibitors of platelet aggregation. Since the platelet receptor
GP IIb-IIIa acts as the final common pathway for platelet aggregation, the 
Company believes that its inhibition offers the most effective means to prevent 
thrombosis.

Oral GP IIb-IIIa inhibitors could represent a new class of drugs for patients
with a history of acute coronary syndromes or cerebrovascular accidents. Over
six million people in the U.S. have a history of heart attack, stroke or
transient ischemic attack. Oral GP IIb-IIIa inhibitors may prove useful in
helping to prevent these catastrophic events.

COR has developed an oral GP IIb-IIIa inhibitor to prevent platelet aggregation.
Results to date of Phase I and initial Phase II studies for the Company's lead
compound, cromafiban, show that it has high affinity and specificity for GP
IIb-IIIa. Inhibition of platelet aggregation by cromafiban has been shown to be
dose- and concentration-dependent. Plasma concentrations have indicated a
sufficiently long elimination half-life to allow for once-daily dosing with a
low peak-to-trough ratio and low inter-patient variability. No food interactions
have been observed. Bleeding was the most prevalent complication encountered
during cromafiban therapy in clinical trials conducted to date.

Factor Xa Inhibitor Program

The Company has identified the factor Xa/prothrombinase complex as a target for
small molecule inhibitors. The factor Xa/prothrombinase complex catalyzes the
conversion of prothrombin to thrombin. The Company believes that the inhibition
of this conversion offers the possibility for a safer and potentially more
efficacious approach to arterial and venous thrombosis than is presently
available with agents that inhibit both thrombin generation and thrombin
activity (e.g., heparin and low molecular weight heparin.) The Company's
scientists have discovered multiple chemical classes of novel small molecule
inhibitors with high potency and specificity which have been shown to block both
arterial and venous thrombosis in various animal models. A lead compound that
can be administered orally is currently in preclinical development. The Company
believes that the development of inhibitors in this class may offer significant
clinical advantages over presently available agents such as heparin, low
molecular weight heparin or warfarin sodium.



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<PAGE>   6



Growth Factor Inhibitor Program

The Company's growth factor inhibitor program is directed toward the discovery
of protein and small molecule inhibitors of certain growth factor receptors in
the tyrosine kinase family. These inhibitors have the potential to reduce
restenosis following coronary intervention. This program is subject to a
collaboration agreement with Kyowa Hakko Kogyo Co., Ltd. (see "Collaboration
Agreements - Relationship with Kyowa Hakko Kogyo Co., Ltd.")

Other Research and Development Programs

The Company's thrombin receptor inhibitor program is directed toward the
discovery of agents for the treatment of arterial thrombosis and restenosis as
well as stroke. Thrombin is an enzyme that has multiple effects on cells and
proteins within the vasculature and is the most potent activator of platelets.
This program is subject to a collaboration agreement (see "Collaboration
Agreements - Relationship with Ortho Pharmaceutical Corporation.")

The Company's platelet ADP receptor program is directed toward the discovery of
agents for the treatment of arterial thrombosis as well as stroke. ADP receptors
on the surface of platelets play a key role in promoting platelet activation and
aggregation.

The Company's myocardial signal transduction program is directed toward the
discovery of agents for the treatment and prevention of congestive heart
failure. The Company is focusing on particular molecular targets in a specific
signaling pathway as a site for intervention. This program may also have
application in the treatment of myocardial ischemia.

The Company's integrin signal transduction program may produce agents that are
useful for the treatment or prevention of a wide variety of disorders including
thrombosis, inflammation, atherosclerosis and tumor metastasis. Integrins play a
key role in modulating not only cell migration and shape but also growth and
differentiation, thus placing them at a central location in a variety of disease
processes. This effort is being conducted in collaboration with investigators at
the Scripps Research Foundation.

Non-cardiovascular Research Applications

The Company's research has resulted in the identification of compounds with
potential non-cardiovascular applications. The Company believes certain of its
growth factor inhibitors may have applications in treating certain other
disorders which involve cell proliferation, such as cancer, angiogenesis and
chronic renal failure. The Company has identified other compounds with potential
applications in the areas of wound healing, tumor metastasis and osteoporosis.
The Company intends to pursue such opportunities and seek collaboration partners
to develop and commercialize any potential product opportunities where
appropriate.



DRUG DISCOVERY CAPABILITIES

To achieve its drug discovery objectives, the Company has established advanced
capabilities in several key technology areas.

Cardiovascular Biology

The Company's scientists and advisors have contributed to certain key advances
in the scientific understanding of thrombosis, restenosis and heart failure. The
Company has applied this expertise in its choice of specific disease targets and
in the creation of its drug discovery strategies. The Company's major focus has
been on thrombosis, the process underlying the syndromes of acute myocardial
infarction, unstable angina and restenosis, as well as the process of vascular
smooth muscle cell proliferation following PCI or other vascular interventional
procedures. The Company's scientists have targeted several of the potential
mechanisms that regulate intravascular thrombosis or restenosis, including the
platelet, the coagulation factor cascade and the vascular wall. The Company's
approach has been to understand the



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pathophysiology of the disease process itself and then to identify and
characterize molecular targets for which an agonist or antagonist might have a
positive therapeutic impact.

High Throughput Screening

The Company has applied its biological expertise to develop a variety of novel
assays suitable for high throughput screening. For each high throughput
screening assay developed, numerous secondary assays for confirming in vitro
activity and specificity have also been developed. The Company's screening
library consists of compounds either developed internally or purchased from
commercial or academic groups. The Company uses computer-based algorithms to
model molecular diversity in order to maximize the overall diversity of its
compound library. The Company is currently conducting high throughput screening
using multiple proprietary assays against the Company's molecular targets.

Medicinal Chemistry

The Company has established capabilities to synthesize small organic molecules.
These capabilities use both structure-based design principles and traditional
analog synthetic approaches applied to small molecules discovered through the
screening of organic molecules in the Company's proprietary assays. The Company
also has a combinatorial chemistry program. Using structure-based design
approaches, the Company believes it has developed particular expertise in
developing small molecule organic compounds that mimic the activity of peptide
leads. This capability enables the Company to more effectively generate
compounds with appropriate pharmaceutical properties, such as oral
bioavailability and a prolonged half-life.

Animal Model Studies

The Company has established an important internal capability in the development
of animal models. The Company uses a variety of animal models that are relevant
in predicting responses to the Company's disease targets in humans, including
proprietary models developed internally. In addition, the Company works closely
with outside consultants and laboratories in other areas, such as the
development of knock-out and transgenic models and the evaluation of compounds
in primate models. Using internal and external capabilities, the Company can
rapidly evaluate compounds with therapeutic potential in multiple complementary
models.



RESEARCH AND DEVELOPMENT EXPENSES

In 1998, 1997 and 1996, the Company's research and development expenses were
$39,915,000, $47,831,000 and $50,791,000 respectively. For further information
about the Company's research and development expenses, see "Management's
Discussion and Analysis of Financial Condition and Results of Operations."



MARKETING AND SALES STRATEGY

The Company's marketing strategy for INTEGRILIN(TM) (eptifibatide) Injection is
to encourage early use of INTEGRILIN in patients with ACS and in patients
undergoing PCI. COR believes that INTEGRILIN sales will increase as early usage
becomes more common and as the number of hospitals stocking INTEGRILIN
increases. COR and Schering have identified over 2,000 hospitals as initial
potential users of INTEGRILIN. Over 1,100 of these hospitals currently stock or
use INTEGRILIN.

COR and Schering have each established cardiovascular sales forces to educate
the medical community about GP IIb-IIIa therapy and to market the use of
INTEGRILIN in such therapy. COR focuses its selling efforts for INTEGRILIN on
clinical cardiologists, interventional cardiologists and emergency medicine
physicians. The



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<PAGE>   8


Company also focuses on hospital pharmacy directors, formulary committee
members, hospital administrators and nurses, all of whom might affect purchasing
decisions.

The Company and Schering are worldwide partners for INTEGRILIN(TM)
(eptifibatide) Injection. The Company and Schering co-promote the drug in the
United States and share any profits or losses. Schering is responsible for the
distribution of the final product from manufacturers to wholesalers. In Europe,
Schering has the right to launch the product as an exclusive licensee on a
royalty-bearing basis for a period of time. Following this initial period, the
Company has the right to co-promote the product in Europe and share any profits
or losses. In all co-promotion territories, the exact profit-sharing ratio
between the companies depends on the amount of sales effort contributed by each
company. Outside of the United States, Canada and Europe, Schering is the
exclusive licensee on a royalty-bearing basis. Schering is primarily responsible
for regulatory filings outside the United States and Canada. Schering
participates in and shares the costs of continuing development of INTEGRILIN.
See "Collaboration Agreements - Collaboration Agreement with Schering-Plough
Ltd. and Schering Corporation."

The Company's overall marketing strategy is to market any products for which it
obtains approval either directly or through co-promotion arrangements or other
licensing arrangements with pharmaceutical or biotechnology companies. The
Company's products under development are targeted towards both the acute care
and the chronic care markets. The Company intends to retain selected North
American and international marketing rights for products, where appropriate.

The Company has not developed a specific commercialization plan with respect to
other potential products. Implementation will depend in large part on the market
potential of any product candidates, as well as on the Company's financial
resources. The Company may establish co-promotion, corporate partner or other
arrangements for the marketing and sale of certain of its products and in
certain geographic markets. The Company may not be successful in establishing
such arrangements and/or these arrangements may not result in the successful
marketing and sales of any of the Company's products or product candidates.

Sales of INTEGRILIN and potential products may depend heavily upon the
availability of reimbursement from third-party payors, such as government and
private insurance plans. The Company meets with administrators of these plans to
discuss the potential medical benefits and cost-effectiveness of its products.
The Company believes this approach may assist in obtaining reimbursement
authorization for its products from these third-party payors. See "Additional
Risk Factors - Pharmaceutical Pricing and Reimbursement."



COMPETITION

Due to the incidence and severity of cardiovascular diseases, the market for
therapeutic products that address such diseases is large and competition is
intense and expected to increase. The Company's most significant competitors are
major pharmaceutical companies and established biotechnology companies, which
have significant resources and expertise in research and development,
manufacturing, testing, obtaining regulatory approvals and marketing. Emerging
pharmaceutical and biotechnology companies may also prove to be significant
competitors, particularly through collaboration arrangements with large
pharmaceutical companies. Many of these competitors have cardiovascular products
approved or in development and operate large, well-funded cardiovascular
research and development programs. Furthermore, academic institutions,
governmental agencies and other public and private research organizations
conduct research, seek patent protection and establish collaboration
arrangements for product and clinical development and marketing in the
cardiovascular disease field and other areas being targeted by the Company. In
addition, these companies and institutions compete with the Company in
recruiting and retaining highly qualified scientific and management personnel.

The Company is aware of products in research or development by its competitors
that address all of the diseases and disorders being targeted by the Company and
any of these products may compete with potential products being developed by the
Company, depending upon the pharmacological characteristics of each product.
Competition is



                                       8
<PAGE>   9


based primarily on product efficacy, safety, the timing and scope of regulatory
approvals, availability of supply, marketing and sales capability, reimbursement
coverage, price and patent position.

In particular, many of the Company's competitors have programs specifically
designed to develop both parenteral and oral GP IIb-IIIa inhibitors. Two other
parenteral GP IIb-IIIa inhibitors have received regulatory approval in the
United States and are currently being marketed and sold: abciximab, which is
being developed by Centocor, Inc. and marketed by Centocor, Inc. and Eli Lilly &
Co.; and tirofiban, which is being developed and marketed by Merck & Co., Inc.
Orally available GP IIb-IIIa inhibitors are also being developed by a number of
pharmaceutical companies with agents at various stages of development. The
Company believes these orally administered compounds are not likely to represent
direct competition for parenteral products because they are being designed for
chronic therapies, are expected to be dosed to have a lesser anti-platelet
effect than parenteral products and are designed to have a long biological
half-life. Competitors might succeed in developing products or technologies that
are more effective than those being developed by the Company and these products
or technologies might render the Company's technology obsolete or
noncompetitive.

Any product which the Company succeeds in developing and for which it gains
regulatory approval must then compete for market acceptance and market share.
For certain of the Company's potential products, important competitive factors
will be the pricing and timing of market introduction of competitive products.
Accordingly, important competitive factors will be the relative speed with which
companies can develop products, complete the clinical testing and approval
processes and supply commercial quantities of the product to the market. With
respect to clinical testing, competition may also delay progress by limiting the
number of clinical investigators and patients available to test the Company's
potential products.



COLLABORATION AGREEMENTS

The Company evaluates, on an ongoing basis, potential collaborations where such
relationships may complement and expand the Company's research, development,
sales or marketing capabilities. The Company is currently engaged in a number of
collaborations with other companies, consultants, universities and medical
centers. The Company's main collaboration agreements are with Schering and Kyowa
Hakko Kogyo Co., Ltd. The research term of the Company's agreement with Ortho
Pharmaceutical Corporation expired in December 1998.

Collaboration Agreement with Schering-Plough Ltd. and Schering Corporation

In April 1995, the Company entered into a collaboration agreement with Schering
to jointly develop and commercialize INTEGRILIN(TM) (eptifibatide) Injection on
a worldwide basis. In December 1998, the Company and Schering amended the
agreement. See also "Marketing and Sales Strategy." Pursuant to this agreement,
decisions regarding the ongoing development and marketing of INTEGRILIN are
generally subject to the oversight of a Joint Steering Committee with equal
membership from the Company and Schering, although certain development decisions
are allocated specifically to the Company and in those markets where Schering
has exclusive marketing rights, Schering has decision-making authority with
respect to marketing issues.

The Company and Schering co-promote INTEGRILIN in the United States and share
any profits or losses. Schering is responsible for the distribution of the final
product from manufacturers to wholesalers. In Europe, Schering has the right to
launch INTEGRILIN as an exclusive licensee on a royalty-bearing basis for a
period of time. Following this initial period, the Company has the right to
co-promote the product in Europe and share any profits or losses. In all
co-promotion territories, the exact profit-sharing ratio between the companies
depends on the amount of sales effort contributed by each company. Outside of
the United States, Canada and Europe, Schering is the exclusive licensee on a
royalty-bearing basis. Schering is primarily responsible for regulatory filings
outside the United States and Canada. Schering participates in and shares the
costs of continuing development of INTEGRILIN. Under the terms of the agreement,
both parties have certain rights to terminate for breach.



                                       9
<PAGE>   10

In 1998, the Company recognized $3,933,000 in co-promotion revenue from sales
of INTEGRILIN(TM) (eptifibatide) Injection under its agreement with Schering. In
1998, 1997 and 1996, the Company recognized $32,000,000, $8,000,000 and
$12,000,000, respectively, in milestone revenues and $5,730,000, $11,290,000 and
$6,635,000, respectively, in development-related contract revenues under the
agreement. Schering has agreed to pay additional milestone payments to the
Company if specified development milestones are achieved. If Schering were to
breach or terminate its agreement with the Company, fail to pay milestone
payments or its share of collaborative costs or otherwise fail to conduct its
collaborative activities in a timely manner, the Company would be required to
devote substantial additional resources to the development and promotion of
INTEGRILIN or seek to obtain capabilities or funding through alternative
sources, which would result in a significant delay of these activities.

Collaboration Agreement with Kyowa Hakko Kogyo Co., Ltd.

In November 1992, the Company entered into a collaboration agreement with Kyowa
Hakko Kogyo Co., Ltd. ("Kyowa Hakko") focused on the discovery and development
of small molecule pharmaceuticals, primarily for the prevention of restenosis
following angioplasty. The collaboration targets a defined class of growth
factor inhibitors. This agreement has been amended several times and has been
extended until November 1999. Both companies have committed significant internal
resources to all phases of research. The Company has exclusive development and
marketing rights in the United States for any products resulting from the
collaboration and Kyowa Hakko has exclusive development and marketing rights in
Asia for any such products. The companies have agreed to develop and
commercialize jointly any such products on a shared economic basis in the rest
of the world. The agreement further provides that Kyowa Hakko will have the
exclusive right to develop and commercialize small molecule products for
indications related solely to a single, defined non-cardiovascular disease
indication outside of the United States.

In addition, under the terms of the agreement, Kyowa Hakko has certain rights to
supply bulk material for the manufacture of any products resulting from the
collaboration and the Company has agreed to purchase its requirements for such
material from Kyowa Hakko. If Kyowa Hakko is unable to provide the Company with
adequate supplies of any material, the Company is entitled to seek alternate
suppliers. However, the Company may not be able to establish any alternative
supply arrangements on a timely or commercially reasonable basis.

Collaboration Agreement with Ortho Pharmaceutical Corporation

In December 1993, the Company entered into a collaboration agreement with Ortho
Pharmaceutical Corporation ("Ortho"), focusing on the joint discovery,
development and commercialization of novel pharmaceuticals that may result from
collaborative research on the thrombin receptor. This agreement was amended in
September 1996. The Company and Ortho each provided specified levels of internal
resources to the collaborative research over the initial three-year research
term. In 1997, the Company recognized $2,400,000 in development-related contract
revenues under this agreement. The research term expired in December 1998.

If products arise from this collaboration, Ortho will make development milestone
payments to the Company. In addition, the Company and Ortho may participate (i)
in development of products under the collaboration and share equally in the
development costs on a worldwide basis, (ii) equally in the commercialization of
co-developed products (with the Company's rights of commercialization to be
limited to specified countries, including the major countries of Europe and in
North America, Japan and Australia) and (iii) equally in profits or losses from
any co-developed products in those countries where the companies jointly
commercialize the products. If either company decides not to participate in the
development of a product under the collaboration or does not participate in the
commercialization of such product in one or more countries, that company would
receive royalties based on product sales.



                                       10
<PAGE>   11



MANUFACTURING AND PROCESS DEVELOPMENT

The Company has no manufacturing facilities for either the commercial production
of bulk active drug substances or the manufacture of final dosage forms. The
Company is dependent on contract manufacturers or collaboration partners for the
commercial production of INTEGRILIN(TM) (eptifibatide) Injection and any
potential products or compounds for preclinical research and clinical trial
purposes and expects to be dependent on such manufacturers or collaboration
partners for the foreseeable future. The Company has conducted manufacturing
testing programs required to obtain FDA and other regulatory approvals for the
manufacture of drug substances and drug products. However, the Company has no
experience manufacturing pharmaceutical or other products.

The Company believes the contracted supply of INTEGRILIN is sufficient to meet
current market demand. The Company is working with its vendors on capacity
forecasts to assure that there is an adequate supply of the drug, including raw
materials, in the future. The Company has established long-term supply
arrangements with one supplier for the bulk product (Solvay, Societe Anonyme)
and with another supplier for the filling and final packaging of INTEGRILIN. In
addition, the Company has identified a second manufacturer of bulk product of
INTEGRILIN and has transferred the necessary process technology to that
manufacturer. The Company's manufacturing plans include the addition of capacity
with its existing suppliers and with secondary manufacturers of bulk and
finished product. Agreements with alternative contract manufacturers may not be
reached on a timely basis or at all. The Company may need expanded capacity to
meet additional market demand. If this were to occur, the Company may not be
able to expand capacity in a timely manner or at all.

The Company's dependence upon third parties for the manufacture of its potential
products may adversely affect the Company's profit margins, if any, and its
ability to develop and manufacture products on a timely and competitive basis.
In connection with the commercialization of its existing and potential products,
the Company's strategy is to establish multiple third-party manufacturing
sources on commercially reasonable terms. The Company may not be able to
establish such sources on commercially reasonable terms. Even if such sources
are established, the sources may not be successful. In the event that the
Company is unable to obtain contract manufacturing or obtain such manufacturing
on commercially acceptable terms, it may not be able to commercialize its
products as planned.

The Company believes that material that has been produced by contract
manufacturers has been done in conformity with applicable regulatory
requirements. The Company has established a quality assurance/control program to
ensure that the Company's compounds are manufactured in accordance with Current
Good Manufacturing Practices ("CGMP"), the requirements of the California State
Food and Drug Administration and other applicable regulations. Any contract
manufacturers that the Company may use must adhere to CGMP. The FDA or other
regulatory agencies may not approve the processes or the facilities by which any
of the Company's potential products may be manufactured. In addition, if the
facilities cannot pass regular post-approval FDA inspections, manufacturing and
distribution may be disrupted, recalls of distributed products may be necessary
and other sanctions could be applied, which would have a material adverse effect
on the Company's business, financial condition and results of operations. See
"Government Regulation."

The Company believes that all of its existing compounds can be produced using
established manufacturing methods, including cell culture, fermentation or
traditional pharmaceutical synthesis. The manufacture of the Company's compounds
is based in part on technology that the Company believes to be proprietary.
Contract manufacturers may utilize their own technology, the technology of the
Company or that of third parties. Successful technology transfer is needed to
ensure success with potential secondary suppliers. Such manufacturers may not
abide by the limitations or confidentiality restrictions in licenses with the
Company. In addition, any such manufacturer may develop process technology
related to the manufacture of the Company's compounds that such manufacturer
owns either independently or jointly with the Company. This would increase the
Company's reliance on such manufacturer or require the Company to obtain a
license from such manufacturer in order to have its products manufactured. Any
such license may not be available on terms acceptable to the Company, if at all.

For the Company's product candidates in development, the Company expects that it
will need to improve or modify its existing process technologies and
manufacturing capabilities. The Company cannot quantify the time or expense that
may ultimately be required to improve or modify its existing process
technologies, but it is possible that such



                                       11
<PAGE>   12



time or expense could be substantial. Moreover, the Company may not be able to
implement any of these improvements or modifications successfully.



PATENTS, PROPRIETARY RIGHTS AND LICENSES

Patents

The Company's policy is to file patent applications to protect technology,
inventions and improvements that are important to the development of its
business. The Company also relies upon trade secrets, know-how, continuing
technological innovations and licensing opportunities to develop and maintain
its competitive position. The Company plans to prosecute and defend its patent
applications aggressively, including any patents that may issue, as well as its
proprietary technology.

The Company's success will depend in part on its ability to obtain and maintain
patent protection for its product, INTEGRILIN(TM) (eptifibatide) Injection, and
its product candidates in development, both in the United States and in other
countries. The Company has patents or has filed applications for patents
covering many of its product candidates, processes, various aspects of the
Company's platelet aggregation inhibitor, growth factor receptor and venous
thrombosis programs, as well as other programs. Many of the patents or
applications include composition of matter claims relating to a number of the
Company's compounds. Also, the Company has exclusively licensed a series of
related patent applications with respect to certain of its product candidates.
The patent positions of pharmaceutical and biotechnology firms, including the
Company, are often uncertain and involve complex legal and factual questions. In
addition, the coverage claimed in a patent application can be significantly
reduced before the patent is issued. Consequently, the Company does not know
whether any of its applications will result in the issuance of patents or
whether any of its issued 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 and since
publication of discoveries in the scientific or patent literature often lags
behind actual discoveries, the Company cannot be certain that it was the first
creator of inventions covered by its pending patent applications or that it was
the first to file patent applications for such inventions. Moreover, the Company
may need to participate in interference proceedings declared by the United
States Patent and Trademark Office or, with respect to foreign patents and
patent applications, with foreign regulatory agencies, to determine priority of
invention, which could result in substantial cost to the Company, even if the
eventual outcome is favorable to the Company.

The development of therapeutic products for cardiovascular applications is
intensely competitive. A number of pharmaceutical companies, biotechnology
companies, universities and research institutions have filed patent applications
or received patents in this field. Some of these applications are competitive
with the Company's applications or conflict in certain respects with claims made
under applications that cover one or more of the Company's programs. Such
conflict could result in a significant reduction of the coverage of the
Company's patents, if issued, which could materially adversely affect the
Company's prospects. In addition, if patents are issued to other companies that
contain competitive or conflicting claims and such claims are ultimately
determined to be valid, the Company may not be able to obtain licenses to these
patents at a reasonable cost or develop or obtain alternative technology.

In October 1997, a patent opposition was filed in Europe by another company
against the claims of a patent granted to the Company in Europe covering broad,
generic claims for INTEGRILIN, as well as numerous related compounds that are
not part of the Company's core technology. The opposition asserts that all
claims of the patent are unpatentable. The Company intends to vigorously defend
its patent. However, this patent opposition may result in an unfavorable
outcome.

Trade Secrets

The Company also relies upon trade secret protection for its confidential and
proprietary information. Other parties may independently develop substantially
equivalent proprietary information and techniques, otherwise gain access to



                                       12
<PAGE>   13

the Company's trade secrets or disclose the Company's trade secrets or such
substantially equivalent technology. In addition, the Company may not be able to
meaningfully protect its trade secrets.

Licensed Technology

The Company has obtained licenses from certain universities, companies and
research institutions to technologies, processes and compounds that it believes
may be important to the development of its products. These agreements require
the Company to pay license maintenance fees and, upon commercial introduction of
certain products, to pay royalties. These include an exclusive license agreement
with the Regents of the University of California that may be canceled or
converted to a non-exclusive license if specified milestones are not achieved.
These licenses may not provide effective protection against the Company's
competitors.

Confidentiality Agreements

It is the Company's policy to require its employees, consultants, outside
scientific collaborators, sponsored researchers and other advisors to execute
confidentiality agreements upon the commencement of employment or consulting
relationships with the Company. These agreements provide that all confidential
information developed or made known to the individual during the course of the
individual's relationship with the Company 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 conceived by the
individual while in the Company's employment shall be the exclusive property of
the Company. These agreements may not provide meaningful protection or adequate
remedies for the Company's trade secrets in the event of unauthorized use or
disclosure of such information.



GOVERNMENT REGULATION

The production and marketing of the Company's product, INTEGRILIN(TM)
(eptifibatide) Injection and the Company's ongoing research and development of
product candidates and other activities, are subject to extensive regulation by
numerous government authorities in the United States and other countries. The
Food, Drug and Cosmetic Act (the "FDC Act") and other federal statutes and
regulations govern or influence the development, testing, manufacture, labeling,
storage, approval, advertising, promotion, sale and distribution of drug
products. Satisfaction of such regulatory requirements typically takes several
years or more depending upon the type, complexity and novelty of the product and
requires the expenditure of substantial resources. For its currently marketed
product, INTEGRILIN and for prospective products, failure to comply with
applicable regulatory requirements after obtaining regulatory approval can,
among other things, result in the suspension of regulatory approval, warning
letters, recall of product, suspension of production and/or distribution and
possible civil and criminal sanctions.

The FDA's policies may change and additional governmental regulations may be
promulgated which could prevent or delay regulatory approval of the Company's
potential products. The Company is unable to predict the likelihood of adverse
governmental regulation that might arise from future legislation or
administrative action, either in the United States or abroad. Furthermore, the
Company may encounter problems in clinical trials that will cause the Company or
the FDA to delay or suspend clinical trials. The Company may not be granted
approval for potential products. Additionally, the Company may not have
sufficient resources to carry potential products through the regulatory approval
process.

Clinical Testing

Prior to marketing in the United States, any product developed by the Company
must undergo rigorous preclinical testing and clinical trials and an extensive
regulatory approval process implemented by the FDA under the FDC Act. The steps
ordinarily required before a drug may be commercially marketed in the United
States include (a) the submission to the FDA of an Investigational New Drug
application (including results of preclinical testing) which must become
effective before clinical trials may commence; (b) the conduct of adequate and
well-controlled clinical trials to establish the safety and efficacy of the
drug; (c) the submission to the FDA of a new drug application



                                       13
<PAGE>   14



("NDA"); and (d) the FDA's approval of the applications, including approval of
all product labeling and inspection of manufacturing facilities.

Preclinical studies must be conducted in compliance with Good Laboratory
Procedures regulations. Clinical testing must meet requirements for
Institutional Review Board oversight and informed consent, as well as FDA prior
review, oversight and Good Clinical Practice regulations. Generally, clinical
trials involve three phases and are subject to detailed protocols, which must be
reviewed by the FDA. The Company or the FDA may suspend clinical trials at any
time if either believes that the subjects participating in such trials are being
exposed to unacceptable health risks.

Data obtained from preclinical testing and clinical trials are susceptible to
varying interpretations that could delay, limit or prevent regulatory approvals.
The Company may not obtain regulatory approval for any of the Company's
potential products. If regulatory approval is granted by the FDA, such approval
will be limited to those specific segments of the population for which the
product is effective, as demonstrated through clinical trials. Approval may
entail ongoing requirements for post-marketing studies. Product candidates
developed by the Company alone or in conjunction with others may not be proven
to be safe and efficacious in clinical trials or may not meet all of the
applicable regulatory requirements needed to receive or maintain marketing
approval.

Other Regulation

Among the conditions for FDA approval of a pharmaceutical product is the
requirement that the manufacturer's quality control and manufacturing procedures
(either the Company's own or a third-party manufacturer's) conform to CGMP which
must be followed at all times. In complying with CGMP regulations,
pharmaceutical manufacturers must expend resources and time to ensure compliance
with specifications and production, record keeping, quality control, reporting
and other requirements. See also "Manufacturing and Process Development."

Outside the United States, the Company's ability to market a product is
contingent upon receiving marketing authorization from the appropriate
regulatory authorities. The requirements governing the conduct of clinical
trials, marketing authorization, pricing and reimbursement vary widely from
country to country. At present, foreign marketing authorizations are applied for
at a national level, although within the EU, centralized procedures are
available to companies wishing to market a product in more than one EU member
state. If the regulatory authorities are satisfied that adequate evidence of
safety, quality and efficacy has been presented, a marketing authorization will
be granted. This foreign regulatory approval process includes all of the risks
and potential delays associated with FDA approval set forth above.

The Company must also comply with other applicable federal, state and local laws
and regulations, such as the Occupational Safety and Health Act, the
Environmental Protection Act, the Nuclear Energy and Radiation Control Act, the
Toxic Substances Control Act, national restrictions on technology transfer,
regulations for the protection of human subjects in clinical studies and for
animal welfare in preclinical studies and import, export and customs regulation.
From time to time Congressional Committees and federal agencies have indicated
an interest in implementing further regulation of biotechnology and its
applications.



INSURANCE

The testing, marketing and sale of human pharmaceuticals expose the Company to
significant and unpredictable risks of product liability claims in the event
that the use of its technology or products is alleged to have resulted in
adverse effects. Such risks will exist even with respect to any products that
receive regulatory approval for commercial sale. While the Company has obtained
liability insurance for commercial use of INTEGRILIN(TM) (eptifibatide)
Injection and the conduct of the Company's clinical trails, such insurance may
not be sufficient to satisfy any liability that may arise. Additionally,
adequate insurance coverage may not be available in the future at an acceptable
cost, if at all. A product liability claim may adversely affect the Company's
business, financial condition, and results of operations.



                                       14
<PAGE>   15



EMPLOYEES

As of March 1, 1999, the Company had 321 full-time employees, of whom 149 were
in research and development, 103 were in sales and 69 were in marketing, general
and administrative functions. The Company's sales force is located throughout
the United States. All other employees are located at the Company's facility in
South San Francisco, California.

None of the Company's employees is represented by a collective bargaining
agreement. The Company considers its employee relations to be good. The
Company's policy is to enter into confidentiality agreements with its employees
and consultants. See "Patents, Proprietary Rights and Licenses - Confidentiality
Agreements."



                                       15
<PAGE>   16


                             ADDITIONAL RISK FACTORS

Stockholders and potential investors in shares of the Company's stock should
carefully consider the following risk factors, in addition to other information
in this Report. The Company is identifying these risk factors as important
factors that could cause the Company's actual results to differ materially from
those contained in any written or oral forward-looking statements made by or on
behalf of the Company. The Company is relying upon the safe-harbor for
forward-looking statements and any such statements made by or on behalf of the
Company are qualified by reference to the following cautionary statements, as
well as to those set forth elsewhere in this Report.



HISTORY OF OPERATING LOSSES AND UNCERTAINTY OF FUTURE PROFITABILITY AND FUNDING

The Company's revenues to date have consisted largely of contract revenue from
milestone payments and, to a very limited extent, contract revenue from product
sales by Schering of the Company's only commercial product, INTEGRILIN(TM)
(eptifibatide) Injection. Historically, the Company's expenses have exceeded
revenues. The Company had an accumulated deficit as of December 31, 1998 of
$189,164,000. These losses may increase as the Company expands its research and
development and commercialization activities and such losses may fluctuate
significantly from quarter to quarter. The Company may never achieve or sustain
significant revenues from product sales or profitable operations. The Company's
prospects are highly dependent upon increasing the sales of INTEGRILIN by 
Schering.

The development of the Company's technology and potential products will require
a commitment of substantial funds to conduct the costly and time-consuming
research, preclinical testing and clinical trials necessary to develop and
optimize such technology and potential products, to establish manufacturing,
marketing and sales capabilities and to bring any such products to market. The
Company's future capital requirements will depend upon many factors, including
continued scientific progress in the research and development of the Company's
technology and drug programs, the size and complexity of these programs, the
ability of the Company to establish and maintain collaborative arrangements,
progress with preclinical testing and clinical trials, the time and costs
involved in obtaining regulatory approvals, the cost involved in preparing,
filing, prosecuting, maintaining and enforcing patent claims or trade secrets
and product commercialization activities. The Company may not be able to
successfully develop or commercialize any of its potential products.

The Company anticipates that its existing capital resources and interest earned
thereon will enable it to maintain its operations at least through the end of
2000. The Company may seek additional funding through collaboration arrangements
and public or private financings, including equity financings. Such additional
funding may not be available on favorable terms, if at all. In such event, the
Company may need to delay or curtail its research and development activities to
a significant extent. See "Management's Discussion and Analysis of Financial
Condition and Results of Operations - Liquidity and Capital Resources."



NO ASSURANCE OF MARKET ACCEPTANCE OF INTEGRILIN; LIMITED MARKETING AND SALES
EXPERIENCE

The Company's prospects are highly dependent upon increasing the sales of
INTEGRILIN. If INTEGRILIN sales fail to increase, it would have a material
adverse effect on the Company's business, financial condition and results of
operations.

A number of factors may affect the rate and breadth of market acceptance of
INTEGRILIN, including the perception by physicians and other members of the
health care community of the safety and efficacy of INTEGRILIN on an absolute
basis or in comparison to other drugs, the price of INTEGRILIN relative to other
drugs or competing treatment modalities, the availability of third-party
reimbursement, and the effectiveness of the sales and marketing efforts by COR
and Schering. In addition, side effects or unfavorable publicity concerning
INTEGRILIN or comparable drugs on the market could have a material adverse
effect on the Company's ability to obtain physician, patient or third-party
payor acceptance.



                                       16
<PAGE>   17

The Company's strategy is to market and sell INTEGRILIN(TM) (eptifibatide)
Injection directly in the United States and Canada in copromotion with Schering.
In 1998, the Company developed and trained an initial sales force within the
United States. INTEGRILIN has not yet been approved for commercial sale in
Canada. The Company incurred in 1998, and expects to continue to incur,
significant expenses in developing, training, maintaining and managing its sales
organization. The cost of establishing and maintaining the sales force may
exceed INTEGRILIN product revenues and the Company's direct marketing and sales
efforts may not be successful. In addition, the Company competes with many other
companies that currently have extensive and well-funded marketing and sales
operations. The Company's marketing and sales efforts may not compete
successfully against such other companies. See "Marketing and Sales Strategy."



PHARMACEUTICAL PRICING AND REIMBURSEMENT

In both domestic and foreign markets, sales of pharmaceutical products depend
heavily upon the availability of reimbursement from third-party payors,
including government health administration authorities, managed care providers,
private health insurers and other organizations. In addition, other third-party
payors may challenge the price and cost effectiveness of medical products and
services. In many major markets outside the United States, pricing approval is
required before sales can commence. Significant uncertainty exists as to the
reimbursement status of newly approved health care products.

The Company may not be able to obtain its desired price on its products. Also,
government-approved prices, once established, may not be reduced in subsequent
years. The Company's products may not be considered cost effective. Also,
adequate third-party reimbursement may not be available to enable the Company to
maintain price levels sufficient to realize an appropriate return on its
investment in product development. Legislation and regulations affecting the
pricing of pharmaceuticals may change before the Company's product candidates
are approved for marketing. Adoption of such legislation could further limit
reimbursement for medical products. If adequate coverage and reimbursement
levels are not provided by the government and third-party payors for the
Company's products, the market acceptance of these products would be adversely
affected, which would have a material adverse effect on the Company's business,
financial condition and results of operations.



UNCERTAINTIES RELATED TO REGULATORY APPROVAL

Before obtaining required regulatory approvals for the commercial sale of any of
the Company's potential products under development, the Company must demonstrate
through preclinical testing and clinical trials and, to the FDA's satisfaction,
that each product is safe and effective for use in indications for which
approval is requested. The results from preclinical testing and early clinical
trials may not be predictive of results obtained in large clinical trials.
Companies in the pharmaceutical and biotechnology industries have suffered
significant setbacks in various stages of clinical trials, even in advanced
clinical trials after promising results had been obtained in earlier trials.

The development of safe and effective products is highly uncertain and subject
to numerous risks. Product candidates that may appear to be promising in
development may not reach the market for a number of reasons. Product candidates
may be found ineffective or cause harmful side effects during clinical trials,
may take longer to progress through clinical trials than had been anticipated,
may fail to receive necessary regulatory approvals, may prove impracticable to
manufacture in commercial quantities at reasonable cost and with acceptable
quality or may fail to achieve market acceptance. Completion of research,
preclinical testing and clinical trials may take many years and the length of
time varies substantially with the type, complexity, novelty and intended use of
the product. Delays or rejections may be encountered based upon many factors.
The Company's current development programs may not be successfully completed.
The Company's regulatory applications to conduct clinical trials may not be
allowed to proceed by the FDA or other regulatory authorities, or such clinical
trials may not commence as planned.



                                       17
<PAGE>   18


All of the Company's potential products are subject to extensive regulation and
will require approval from the FDA and other regulatory agencies prior to
commercial sale. The cost to the Company of conducting clinical trials for any
potential product can vary dramatically based on a number of factors, including
the order and timing of clinical indications pursued and the extent of
development and financial support, if any, from corporate partners. Because of
the intense competition in the cardiovascular market, the Company may have
difficulty obtaining sufficient patient populations or clinician support to
conduct its clinical trials as planned and may have to expend substantial
additional funds to obtain access to such resources or delay or modify its plans
significantly. See "Competition" and "Government Regulation."



DEPENDENCE ON COLLABORATIVE RELATIONSHIPS

The Company is currently engaged in a number of collaborations with other
companies, consultants, universities and medical centers. The Company's main
collaboration agreements are with Schering and Kyowa Hakko. The research term of
the Company's agreement with Ortho expired in December 1998.

While the Company believes its agreements with collaborators provide incentives
to all parties, these relationships may not be successful or lead to the
development or commercialization of any particular product or product
opportunity. Although under the current agreements, the Company and its
collaborators work exclusively with each other within a defined field for a
defined period, a collaborator or collaborators may terminate its or their
agreement with the Company or separately pursue alternative products,
therapeutic approaches or technologies as a means of developing treatments for
the diseases targeted by the Company or a collaboration. For these and other
reasons, such as a change in a collaborator's strategic direction, even if a
collaborator continues its contributions to the arrangement, it may nevertheless
determine not to actively pursue the development or commercialization of any
resulting products. In such event, the Company's ability to pursue such
potential products could be severely limited.

The Company evaluates, on an ongoing basis, potential collaborations where such
relationships may complement and expand the Company's research, development,
sales or marketing capabilities. Any such arrangements may limit the Company's
flexibility in pursuing alternatives for the commercialization of its products.
The Company may not be able to establish any additional collaboration
arrangements. If established, such arrangements may not be successful. See
"Collaboration Agreements."



LACK OF MANUFACTURING CAPABILITY; RELIANCE ON THIRD-PARTY MANUFACTURERS

The Company currently has no manufacturing facilities and, accordingly, relies
on third parties for clinical and commercial production of INTEGRILIN(TM)
(eptifibatide) Injection and for clinical production of product candidates. If
the Company was unable to contract on acceptable terms for manufacturing
services or if the third party manufacturers or suppliers were to cease
production or otherwise fail to supply the Company, the Company's ability to
produce INTEGRILIN and to conduct preclinical testing and clinical trials of
product candidates, would be adversely affected, potentially resulting in
product supply and distribution shortages of INTEGRILIN and delay of regulatory
approval and new development of product candidates. These results could
materially impair the Company's competitive position and could have a material
adverse effect on the Company's business, financial condition and results of
operations. See "Manufacturing and Process Development."



UNCERTAINTY RELATING TO PATENTS AND PROPRIETARY RIGHTS

Biotechnology and pharmaceutical companies rely on patent and trade secret
protection for significant new technologies, products and processes because of
the long development time, uncertainty and high cost associated with bringing a
new product to the marketplace. The enforceability of patents issued to
companies in this industry



                                       18
<PAGE>   19



can be highly uncertain and involve complex legal and technical questions for
which the legal principles are largely unresolved. The Company's success will
depend in part on its ability to obtain and enforce patent protection for its
technology both in the United States and other countries. While the Company is
seeking and/or maintaining patents for INTEGRILIN(TM) (eptifibatide) Injection
and its product candidates, patents may not issue and issued patents may afford
limited or no protection. Additionally, the Company may not be successful in
enforcing its patents and avoiding infringement of patents granted to others.

In response to litigation, the Company may be required to obtain licenses to
patents or other proprietary rights from third parties. Licenses required under
any patents or proprietary rights may not be made available on terms acceptable
to the Company, if at all. If the Company does not obtain required licenses, it
may encounter delays in product development while attempting to redesign
products or methods or it could find the development, manufacture or sale of
such products requiring licenses to be foreclosed. Further, the Company could
incur substantial costs in defending any patent litigation brought against it or
in asserting the Company's patent rights, including those rights licensed to the
Company by others. See "Legal Proceedings."



VOLATILITY OF COMMON STOCK PRICE

The market prices for securities of pharmaceutical and biotechnology companies,
including the Company, have historically been highly volatile. The market has
from time to time experienced significant price and volume fluctuations that are
unrelated to the operating performance of particular companies. Factors such as
fluctuations in the Company's operating results, announcements of technological
innovations or new therapeutic products by the Company or its competitors,
announcements regarding collaborative agreements, governmental regulation,
clinical trial results, developments in patent or other proprietary rights,
public concern as to the safety of drugs developed by the Company or others,
comments made by securities analysts and general market conditions may have a
significant effect on the market price of the Company's stock. In particular,
the realization of any of the risks described in this Report could have a
significant and adverse impact on the market price. See "Market For Registrant's
Common Equity and Related Stockholder Matters."



NEED TO ATTRACT AND RETAIN KEY EMPLOYEES AND CONSULTANTS

The Company is highly dependent on the principal members of its scientific and
management staff. In addition, the Company relies on consultants to assist the
Company in formulating its research and development strategy. Attracting and
retaining qualified personnel and consultants will be critical to the Company's
success. To pursue its product development and marketing plans, the Company will
be required to hire additional qualified scientific personnel to perform
research and development, as well as personnel with expertise in conducting
clinical trials, government regulation, manufacturing, marketing and sales.
Expansion in the areas of product development, marketing and sales is also
expected to require the addition of management personnel and the development of
additional expertise by existing management personnel. The Company faces
competition for qualified individuals with numerous pharmaceutical and
biotechnology companies, universities and other research institutions. The
Company may not be able to attract and retain such individuals.

In addition, a portion of the Company's research and development is conducted
under sponsored research programs with several universities and research
institutions. The Company depends on the availability of a principal
investigator for each such program and the Company cannot assure that these
individuals or their research staffs will be available to conduct research and
development for the Company. In addition, the Company's academic collaborators
are not employees of the Company. As a result, the Company has limited control
over their activities and can expect that only limited amounts of their time
will be dedicated to Company activities. The Company's academic collaborators
may have relationships with other commercial entities, some of which could
compete with the Company.



                                       19
<PAGE>   20

RISKS ASSOCIATED WITH HAZARDOUS MATERIALS

The Company's research and development involves the controlled use of hazardous
materials, chemicals and various radioactive substances. Although the Company
believes that its safety procedures for handling and disposing of such materials
comply with the standards prescribed by state and federal regulations, the risk
of accidental contamination or injury from these materials cannot be completely
eliminated. In the event of such an accident, the Company could be held liable
for any damages that result and any such liability could exceed the resources of
the Company and could have a material adverse effect on the Company's business,
financial condition and results of operations.



ANTI-TAKEOVER EFFECTS OF DELAWARE LAW AND CERTAIN CHARTER PROVISIONS

The Company's Board of Directors has the authority to issue up to 5,000,000
shares of Preferred Stock and to determine the price, rights, preferences and
privileges of those shares without any further vote or action by the Company's
stockholders. The rights of the holders of Common Stock will be subject to and
may be adversely affected by, the rights of the holders of any Preferred Stock
that may be issued in the future. While the Company has no present intention to
issue shares of Preferred Stock, such issuance, while providing desirable
flexibility in connection with possible acquisitions and other corporate
purposes, could have the effect of making it more difficult for a third party to
acquire a majority of the outstanding voting stock of the Company.

In addition, the Company is subject to the anti-takeover provisions of Section
203 of the Delaware General Corporation Law, which prohibits the Company from
engaging in a "business combination" with an "interested stockholder" for a
period of three years after the date of the transaction in which the person
became an interested stockholder, unless the business combination is approved in
a prescribed manner. The application of Section 203 could have the effect of
delaying or preventing a change of control of the Company.

In January 1995, the Company's Board of Directors adopted a Preferred Share
Purchase Rights Plan, commonly referred to as a "poison pill." In addition, the
Company's Restated Certificate of Incorporation (the "Restated Certificate") 
does not permit cumulative voting. The Restated Certificate also includes a
"Fair Price Provision" that requires the approval of the holders of 66 2/3% of
the Company's voting stock as a condition to a merger or certain other business
transactions with or proposed by, a holder of 15% or more of the Company's
voting stock, except where disinterested Board or stockholder approval is
obtained or certain minimum price criteria and other procedural requirements are
met. These provisions and other provisions of the Restated Certificate, the
Company's bylaws and Delaware corporate law, may have the effect of deterring
hostile takeovers or delaying or preventing changes in control or management of
the Company, including transactions in which stockholders might otherwise
receive a premium for their shares over then current market prices.



RISKS RELATED TO THE YEAR 2000 ISSUE

The Company uses and relies on a wide variety of information technologies,
computer systems and scientific equipment containing computer-related
components. Some of the Company's older computer software programs and equipment
may use two digit fields rather than four digit fields to define the applicable
year (i.e., "98" in the computer code refers to the year "1998.") As a result,
time-sensitive functions of those software programs and equipment may
misinterpret dates after January 1, 2000 to refer to the twentieth century
rather than to the twenty-first century (i.e., "02" could be interpreted as
"1902" rather than "2002.") This condition is commonly referred to as the Year
2000 Issue. The Year 2000 Issue could have a material adverse effect on the
Company's business, financial condition or results of operations.

The Company has developed a strategy to address the potential exposures related
to the Year 2000 Issue on its operations for the year 2000 and beyond. A review
of key financial, informational and operational systems has been completed.
Plans for implementation and testing of any necessary modifications to these key
computer systems and equipment to ensure that they are Year 2000 compliant have
been or are in the final stages of development to address computer system and
equipment problems as required by December 31, 1999. The Company believes that
with these


                                       20
<PAGE>   21


plans and completed modifications, the Year 2000 Issue will not have a material
adverse effect on its business, financial condition or results of operations.
However, even if these modifications are made in a timely fashion, they still
may not prevent a material adverse effect on the Company's business, financial
condition or results of operations. If such a material adverse effect were to
occur, the magnitude of it cannot be known at this time. The Company currently
has no contingency plans to deal with major Year 2000 failures, although such
plans will be developed over the coming quarters if they are deemed necessary.

In addition to risks associated with the Company's own computer systems and
equipment, the Company has relationships with and is to varying degrees
dependent upon a large number of third parties that provide information, goods
and services to the Company. These include corporate partners, suppliers,
vendors, financial institutions and governmental entities. These other
organizations may not adequately address the Year 2000 Issue and their failure
to address the Year 2000 Issue may have a material adverse effect on the
Company's business, financial condition or results of operations. The Company
has instituted a review of key third parties to assess their readiness to
address the Year 2000 Issue.

The total cost of systems assessments and modifications related to the Year 2000
Issue has been and is being funded through operating cash flows and has not been
material to date. The Company has been and is expensing these costs as incurred.
The Company has identified resources to address the Year 2000 Issue. The
aggregate financial impact to the Company of addressing the Year 2000 Issue
cannot be known precisely at this time, but it is currently expected to be less
than $2,000,000. The actual financial impact may exceed this estimate. The
financial impact is not expected to have a material adverse effect on the
Company's business, financial condition or results of operations.



EXECUTIVE OFFICERS OF THE COMPANY

The names of the Company's executive officers as of March 1, 1999 and certain
information about them is set forth below.

<TABLE>
<CAPTION>
Name                              Age                              Position
- ----------------------           -------    ----------------------------------------------------------------
<S>                              <C>        <C>
Vaughn M. Kailian                  54       President, Chief Executive Officer and Director
Laura A. Brege                     41       Senior Vice President, Finance and Chief Financial Officer
Patrick Broderick                  40       Senior Vice President, General Counsel and Corporate Secretary
Charles J. Homcy, M.D.             50       Executive Vice President, Research and Development and Director
Mark D. Perrin                     42       Executive Vice President, Commercial Operations
Lee M. Rauch                       45       Senior Vice President, Corporate Development
</TABLE>


Vaughn M. Kailian has served as President, Chief Executive Officer and a
Director of the Company since March 1990. From 1967 to 1990, Mr. Kailian was
employed by Marion Merrell Dow, Inc., a pharmaceutical company and its
predecessor companies, in various general management, product development,
marketing and sales positions. Mr. Kailian served as Corporate Vice President of
Global Commercial Development, Marion Merrell Dow, Inc.; President and General
Manager, Merrell Dow USA; Vice President, Marketing and Sales, Merrell Dow USA;
and Vice President, Marketing and Sales of Merrell Dow, Europe, Africa and the
Middle East. Mr. Kailian holds a B.A. from Tufts University. Mr. Kailian also
serves as a director of Amylin Pharmaceuticals and Axys Pharmaceutical
Corporation.

Laura A. Brege has served as Senior Vice President, Finance and Chief Financial
Officer of the Company since January 1998 and as Vice President, Finance and
Chief Financial Officer of the Company since January 1992. During 1991, Mrs.
Brege was Vice President, Finance and Chief Financial Officer of Computer Aided
Service, Inc., a manufacturer and marketer of computer systems. From 1988 to
1990, she was Vice President, Finance and Chief Financial Officer of
Flextronics, Inc., an electronics manufacturer. From 1982 to 1988, Mrs. Brege
held various financial positions at The Cooper Companies, Inc., a multinational
pharmaceutical and medical products company, last serving as Treasurer. Mrs.
Brege holds her B.S. from Ohio University and her M.B.A. from the University of
Chicago.



                                       21
<PAGE>   22



Patrick Broderick has served as Senior Vice President, General Counsel and
Corporate Secretary since January 1999. From 1993 until he joined the Company,
Mr. Broderick held various legal positions with McKesson HBOC, Inc., last
serving as Senior Counsel. In this capacity, he was the legal counsel for drug
manufacturers' services for McKesson HBOC, Inc. From 1994 to 1999, Mr. Broderick
was also counsel to various subsidiaries of McKesson HBOC, Inc., including
Healthcare Delivery Systems, Inc., McKesson Bioservices Corporation and J.
Knipper and Company, Inc. From 1988 to 1992, Mr. Broderick practiced general
corporate law with Morrison & Foerster, prior to which he practiced business
litigation with McCutchen, Doyle, Brown & Enersen. Mr. Broderick received his
B.A. from Harvard College and his J.D. from Yale Law School.

Charles J. Homcy, M.D. has served as a Director of the Company since January
1998 and as Executive Vice President, Research and Development of the Company
since March 1995. Since 1997, Dr. Homcy has been Clinical Professor of Medicine,
University of California at San Francisco Medical School and Attending Physician
at the San Francisco VA Hospital. From 1994 until he joined the Company, Dr.
Homcy was President of the Medical Research Division of American Cyanamid
Company-Lederle Laboratories, a pharmaceutical company (now a division of
Wyeth-Ayerst Laboratories.) From 1990 until 1994, Dr. Homcy was Executive
Director of the Cardiovascular and Central Nervous System Research Section at
Lederle Laboratories, a pharmaceutical company. From 1991 to 1995, Dr. Homcy
also served as an attending physician at The Presbyterian Hospital, College of
Physicians and Surgeons, at Columbia University in New York. From 1979 to 1990,
he was an attending physician at Massachusetts General Hospital and an Associate
Professor of Medicine at Harvard Medical School. Dr. Homcy received his B.A. and
his M.D. degrees from the Johns Hopkins University in Baltimore.

Mark D. Perrin has served as Executive Vice President, Commercial Operations
since November 1995. From 1992 until he joined the Company, Mr. Perrin was Vice
President, Marketing and Sales, of Burroughs Wellcome Company, a pharmaceutical
company. From 1979 to 1992, Mr. Perrin held various sales and marketing
positions at American Cyanamid Company-Lederle Laboratories, a pharmaceutical
company (now a division of Wyeth-Ayerst Laboratories), last serving as Vice
President and General Manager of Lederle Pharmaceuticals. Mr. Perrin received
his B.S. from Fordham University and his Masters of Management from Northwestern
University.

Lee M. Rauch has served as Senior Vice President, Corporate Development since
January 1999. From 1997 to 1999, Ms. Rauch worked for the Mitchell Madison Group
where she was a Partner in the Healthcare Practice with leadership
responsibility for the Pharma/Supply sector. From 1995 to 1997, Ms. Rauch headed
Healthcare Strategies, a consulting practice serving clients in biotechnology,
healthcare information and medical devices. From 1989 to 1995, she held a
variety of corporate positions at Syntex Corporation, including Vice President
of Strategic Marketing, Vice President of New Product Planning, Director of
Therapy Area Planning for cardiovascular and central nervous system disease
areas and Director of Business Development. Prior to 1989, Ms. Rauch worked for
various companies including McKinsey & Co., Inc., Rohm and Haas Company and
American Cyanamid. Ms. Rauch received her B.A. from Arizona State University and
her M.B.A from the University of Chicago.



ITEM 2.  PROPERTIES

The Company leases and occupies facilities consisting of approximately 100,000
square feet of laboratory and office space located in South San Francisco,
California. In 1999, the Company exercised its option to renew the lease for one
five-year period. The Company expects it will require additional laboratory and
office space as it expands its operations. The Company believes that additional
space will be available on commercially acceptable terms. The Company currently
has no production facilities.



ITEM 3.  LEGAL PROCEEDINGS

In October 1997, a patent opposition was filed in Europe by another company
against the claims of a patent granted to the Company in Europe covering broad,
generic claims for INTEGRILIN(TM) (eptifibatide) Injection, as well as numerous
related compounds that are not part of the Company's core technology. The
opposition asserts that all



                                       22
<PAGE>   23



claims of the patent are unpatentable. The Company intends to vigorously defend
its patent. However, this patent opposition may result in an unfavorable
outcome.

In May 1998, a plaintiff voluntarily dismissed all claims against the Company
and Vaughn M. Kailian, the Company's Chief Executive Officer, in a putative
class action lawsuit that had alleged violation of federal securities laws.



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

Not applicable.



                                       23
<PAGE>   24


                                     PART II

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

The Company's Common Stock is traded on the Nasdaq National Market under the
symbol "CORR." The following table sets forth, for the calendar periods
indicated, the high and low sale prices per share of the Company's Common Stock
on the Nasdaq National Market. These prices represent quotations among dealers
without adjustments for retail markups, markdowns or commissions.

<TABLE>
<CAPTION>
1998                    High          Low               1997                   High          Low
- -------------------   --------      --------            ---------------      --------      --------
<S>                   <C>           <C>                                      <C>           <C>     
First Quarter         $  24.88      $   8.63            First Quarter        $  13.88      $   8.38
Second Quarter        $  22.75      $  12.13            Second Quarter       $  11.00      $   7.38
Third Quarter         $  16.00      $   6.81            Third Quarter        $  17.50      $   8.38
Fourth Quarter        $  14.13      $   6.69            Fourth Quarter       $  26.13      $  16.50
</TABLE>

As of March 1, 1999 there were approximately 524 holders of record of the
Company's Common Stock. On March 1, 1999 the last reported sale price on the
Nasdaq National Market for the Company's Common Stock was $ 9.88 per share.



DIVIDEND POLICY

The Company has not paid any dividends since its inception and does not intend
to pay any dividends on its Common Stock in the foreseeable future.



RECENT SALES OF UNREGISTERED SECURITIES

None in fourth quarter or the current year.



                                       24
<PAGE>   25



ITEM 6.  SELECTED FINANCIAL DATA

The selected financial data set forth below should be read in conjunction with
"Management's Discussion and Analysis of Financial Condition and Results of
Operations" and the Financial Statements and Notes thereto included elsewhere in
this Report. The statement of operations data for the years ended December 31,
1998, 1997 and 1996 and the balance sheet data at December 31, 1998 and 1997,
are derived from the audited financial statements of the Company included
elsewhere in this Report. The statement of operations data for the years ended
December 31, 1995 and 1994 and the balance sheet data as of December 31, 1996,
1995 and 1994, are derived from audited financial statements not included
herein. The Company has not declared or paid cash dividends on its Common Stock
since inception and does not intend to pay any cash dividends in the foreseeable
future.

<TABLE>
<CAPTION>
                                                                               Year Ended December 31,
                                                   --------------------------------------------------------------------------------
                                                     1998              1997              1996              1995              1994
                                                   --------          --------          --------          --------          --------
<S>                                                <C>               <C>               <C>               <C>               <C>     
STATEMENT OF OPERATIONS DATA:                                          (in thousands, except per share data)

Total revenues                                     $ 41,963          $ 22,190          $ 18,755          $ 31,850          $    522
Expenses:
     Cost of copromotion revenue                     11,803                --                --                --                --
     Research and development                        39,915            47,831            50,791            37,392            40,185
     Marketing, general and administrative           21,474            10,067             7,303             6,029             4,589
                                                   --------          --------          --------          --------          --------
Total expenses                                       73,192            57,898            58,094            43,421            44,774
                                                   --------          --------          --------          --------          --------
Loss from operations                                (31,229)          (35,708)          (39,339)          (11,571)          (44,252)
Interest income, net                                  3,615             2,216             2,793             4,040             4,715
                                                   --------          --------          --------          --------          --------
Net loss                                           $(27,614)         $(33,492)         $(36,546)         $ (7,531)         $(39,537)
                                                   ========          ========          ========          ========          ========
Basic and diluted net loss per share               $  (1.14)         $  (1.60)         $  (1.86)         $  (0.39)         $  (2.07)
                                                   ========          ========          ========          ========          ========
Shares used in computing
     basic and diluted net loss per share            24,141            20,952            19,636            19,360            19,091
</TABLE>

<TABLE>
<CAPTION>
                                                                                   December 31,
                                              -------------------------------------------------------------------------------------
                                                1998                1997              1996               1995                1994
                                              ---------          ---------          ---------          ---------          ---------
<S>                                           <C>                <C>                <C>                <C>                <C>      
BALANCE SHEET DATA:                                                              (in thousands)

Cash, cash equivalents and short-term
     investments ....................         $  75,205          $  82,569          $  53,134          $  84,834          $  94,432
Total assets ........................           103,093             95,385             71,245            100,906            106,367
Long-term obligations ...............             3,261              2,817              3,365              4,574              4,669
Total liabilities ...................            48,497             16,987             20,803             18,669             19,636
Accumulated deficit .................          (189,164)          (161,550)          (128,058)           (91,512)           (83,981)
Total stockholders' equity ..........            54,596             78,398             50,442             82,237             86,731

</TABLE>



                                       25
<PAGE>   26



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

In addition to the historical data contained herein, the following discussion
contains forward-looking statements that involve risk and uncertainties. The
Company's actual results could differ materially from those anticipated in these
forward-looking statements as a result of certain factors, including those set
forth elsewhere in this Report.


OVERVIEW

Since its inception, the Company has been dedicated to the discovery,
development and commercialization of novel pharmaceutical products to establish
new standards of care for the treatment and prevention of severe cardiovascular
diseases. The Company has incurred a cumulative net loss of $189,164,000 during
the period from inception to December 31, 1998. The Company has funded its
operations primarily through public equity financings and proceeds from
collaboration research and development agreements.

INTEGRILIN(TM) (eptifibatide) Injection is the first product that COR has taken
from discovery to commercialization. INTEGRILIN was approved for marketing in
the United States by the U.S. Food and Drug Administration ("FDA") in May 1998.
INTEGRILIN is indicated for the treatment of patients with acute coronary
syndrome or "ACS" (encompassing unstable angina and non-Q-wave myocardial
infarction, collectively "UA/NQMI") including patients who are to be managed
medically and those undergoing percutaneous coronary intervention ("PCI.")
INTEGRILIN is also indicated for the treatment of patients undergoing PCI.

COR and Schering-Plough Ltd. and Schering Corporation (collectively, "Schering")
are worldwide partners for INTEGRILIN. COR and Schering co-promote the drug in
the United States and share any profits or losses. COR and Schering launched
INTEGRILIN in June 1998 in the United States. See "Marketing and Sales
Strategy."

Total sales of INTEGRILIN to wholesalers, as reported to the Company by
Schering, were $12,200,000 from launch in June 1998 through December 31, 1998.
Product sales as reported by Schering for the period from launch in June 1998 to
December 31, 1998 are not necessarily indicative of product sales for any future
period.

Schering has the right to launch INTEGRILIN in the European Union ("EU") as an
exclusive licensee on a royalty-bearing basis for a period of time. In February
1999, Schering announced that the Committee for Proprietary Medicinal Products
("CPMP") of the European Agency for the Evaluation of Medicinal Products issued
a positive opinion recommending approval of INTEGRILIN for the prevention of
myocardial infarction in patients presenting with UA/NQMI. The CPMP opinion
serves as the basis for a European Commission approval, which is typically
issued in approximately four months. The Company believes that the Commission
approval of the centralized Marketing Authorization application for INTEGRILIN
would result in a single Marketing Authorization with unified labeling that
would be valid in all 15 European Union member states. Schering submitted the
centralized Marketing Application in February 1998. INTEGRILIN has received
regulatory approval in a number of countries outside the EU and the United
States.

COR and Schering are conducting or have conducted Phase II clinical trials of
INTEGRILIN with different thrombolytics in the setting of acute myocardial
infarction. COR and Schering also sponsor additional clinical trials of
INTEGRILIN in a variety of clinical settings.

In addition to its commercial activities, COR continues to pursue a wide array
of research and development programs. The Company's next potential product is an
oral glycoprotein IIb-IIIa ("GP IIb-IIIa") inhibitor to prevent platelet
aggregation. Results to date of Phase I and initial Phase II studies for the
Company's lead compound, cromafiban, show that it has high affinity and
specificity for GP IIb-IIIa. Inhibition of platelet aggregation by cromafiban
has been shown to be dose- and concentration-dependent. Plasma concentrations
have indicated a sufficiently long elimination half-life to allow for once-daily
dosing with a low peak-to-trough ratio and low inter-patient variability. No
food interactions have been observed. Bleeding was the most prevalent
complication



                                       26
<PAGE>   27


encountered during cromafiban therapy in clinical trials conducted to date. COR
is also conducting preclinical research and development in several other
cardiovascular programs.



RESULTS OF OPERATIONS

Fiscal Years Ended December 31, 1998, 1997 and 1996

Total contract revenues were $41,963,000 in 1998 compared to $22,190,000 in 1997
and $18,755,000 in 1996. Copromotion revenue in 1998 was $3,933,000 resulting
from amounts due to the Company from Schering related to the sales of
INTEGRILIN(TM) (eptifibatide) Injection by Schering from launch in June 1998
through December 31, 1998. Milestone revenues in 1998 include $24,000,000
received from Schering in connection with the regulatory approval of INTEGRILIN
for certain indications in the United States and $8,000,000 from Schering in
connection with the acceptance for review of the centralized Marketing
Authorization application seeking marketing approval for INTEGRILIN in the EU.
Milestone revenues in 1997 were $8,000,000 received from Schering in connection
with the completion of PURSUIT, a large Phase III clinical trial for INTEGRILIN.
Milestone revenues in 1996 include $9,000,000 received from Schering in
connection with the safety of INTEGRILIN and $3,000,000 received from Schering
in connection with clinical studies of INTEGRILIN. Development and other
contract revenues were $6,030,000 in 1998 compared to $14,190,000 in 1997 and
$6,755,000 in 1996. Development and other contract revenues in 1998 were lower
than in 1997, primarily due to the completion of PURSUIT in the first half of
1997. The Company expects total contract revenues to continue to fluctuate in
the future.

Cost of copromotion revenue was $11,803,000 in 1998. Cost of copromotion revenue
includes certain manufacturing-related and marketing expenses incurred in
connection with the collaboration with Schering.

Research and development expenses were $39,915,000 in 1998 compared to
$47,831,000 in 1997 and $50,791,000 in 1996. The decrease in 1998 compared to
1997 and the decrease in 1997 compared to 1996 both resulted from the timing of
activities of PURSUIT, offset in part by increases in headcount and other
research, development and clinical activities associated with other potential
products. The Company expects research and development expenses to increase over
the next several years, although the timing of certain of these expenses may
depend on the timing and phase of, and indications pursued in, additional
clinical trials of INTEGRILIN and other product candidates in development.

Marketing, general and administrative expenses were $21,474,000 in 1998 compared
to $10,067,000 in 1997 and $7,303,000 in 1996. The increase in 1998 compared to
1997 was primarily due to the addition of marketing and sales personnel for the
commercialization of INTEGRILIN, as well as increased staffing and
administrative expenses associated with general corporate activities. The
increase in 1997 compared to 1996 was primarily due to pre-commercial activities
associated with INTEGRILIN, as well as increases in staffing and administrative
expenses associated with general corporate activities. The Company expects
marketing, general and administrative costs to continue to increase
significantly over the next several years.

Interest income was $4,342,000 in 1998 compared to $2,840,000 in 1997 and
$3,552,000 in 1996. The increase in 1998 compared to 1997 and the decrease in
1997 compared to 1996 were primarily due to changes in cash and investment
balances. Interest expense was $727,000 in 1998 compared to $624,000 in 1997 and
$759,000 in 1996. Both the increase in 1998 compared to 1997 and the decrease in
1997 compared to 1996 were primarily due to changes in the amount of debt
obligations.

The Company incurred a net loss of $27,614,000 in 1998 and, accordingly, no
provision for federal or state income taxes was recorded. At December 31, 1998,
the Company had federal net operating tax loss carryforwards of approximately
$178,900,000. The Company's ability to use its net operating loss carryforwards
may be subject to an annual limitation in future periods. The Company believes,
however, that this limitation will not have a material impact on its future
operating results.



                                       27
<PAGE>   28




LIQUIDITY AND CAPITAL RESOURCES

The Company had available cash, cash equivalents and short-term investments of
$75,205,000 at December 31, 1998. Cash in excess of immediate requirements is
invested according to the Company's investment policy. The primary objective of
the Company's investment activities is to preserve principal while at the same
time maximizing yields without significantly increasing risk. From inception,
the Company has funded its operations primarily through public equity financings
and proceeds from collaboration research and development agreements. Additional
funding has come from private equity financings, grant revenues, interest income
and property and equipment financings. At December 31, 1998, the Company had
approximately $4,000,000 available under an equipment financing facility.

Net cash used for operating activities and additions to capital equipment
decreased to $10,429,000 in 1998 from $30,968,000 in 1997, primarily due to the
timing of activities related to the agreement with Schering, including milestone
revenues received, partially offset by increased expenses. The Company
anticipates that its expenditures for operating activities and additions to
capital equipment will increase in future periods. The timing of these
expenditures may vary from period to period depending on the timing and phase
of, and indications pursued in, additional clinical trials of INTEGRILIN(TM)
(eptifibatide) Injection and clinical trials of product candidates in
development. Cash provided by financing activities of $2,895,000 in 1998,
$60,443,000 in 1997 and $3,927,000 in 1996 result primarily from the issuance of
Common Stock, including a public equity financing in 1997, and the net effect of
property and equipment financings.

The Company expects its cash requirements will increase in future years due to
costs related to continuation and expansion of research and development,
including clinical trials and increased marketing, sales, general and
administrative activities. The Company anticipates that its existing capital
resources and interest earned thereon will enable it to maintain its operations
at least through the end of 2000. However, the Company's capital requirements
may change depending on numerous factors, including the progress of the
Company's research and development programs, the scope and results of
preclinical and clinical studies and the number and nature of the indications
the Company pursues in clinical studies. The Company's capital requirements may
also change due to the timing of regulatory approvals, technological advances,
determinations as to the commercial potential of the Company's future products
and the status of competitive products. The Company's capital requirements may
also change because of other unanticipated circumstances. In addition,
expenditures may be dependent on the establishment and maintenance of
collaboration relationships with other companies, the availability of financing
and other factors. The Company may need to raise substantial additional funds in
the future. Such funds may not be available on favorable terms, if at all. If
such funds are unavailable, the Company may need to delay or curtail its
research and development activities to a significant extent.

The Company's business is subject to significant risks including, but not
limited to, the successful sales, distribution and manufacture of INTEGRILIN,
the success of its research and development activities, the length and expense
of obtaining regulatory approval and the results of clinical trials. Other
significant risks include uncertainty related to the availability of future
funding, uncertainty related to third-party reimbursement for the Company's
product and/or potential products, and uncertainty related to its collaborative
relationships. In addition, the Company's product candidates may be difficult to
manufacture on a large scale, uneconomical to market or precluded from
commercialization by proprietary rights of other parties. Additional expenses,
delays and lost opportunities that may arise out of these and other risks could
have a material adverse effect on the Company's business, financial condition
and results of operations.



YEAR 2000 COMPLIANCE

The Company uses and relies on a wide variety of information technologies,
computer systems and scientific equipment containing computer-related
components. Some of the Company's older computer software programs and equipment
may use two digit fields rather than four digit fields to define the applicable
year (i.e., "98" in the computer code refers to the year "1998.") As a result,
time-sensitive functions of those software programs and equipment may
misinterpret


                                       28
<PAGE>   29




dates after January 1, 2000 to refer to the twentieth century rather than to the
twenty-first century (i.e., "02" could be interpreted as "1902" rather than
"2002.") This condition is commonly referred to as the Year 2000 Issue. The Year
2000 Issue could have a material adverse effect on the Company's business,
financial condition or results of operations.

The Company has developed a strategy to address the potential exposures related
to the Year 2000 Issue on its operations for the year 2000 and beyond. A review
of key financial, informational and operational systems has been completed.
Plans for implementation and testing of any necessary modifications to these key
computer systems and equipment to ensure that they are Year 2000 compliant have
been or are in the final stages of development to address computer system and
equipment problems as required by December 31, 1999. The Company believes that
with these plans and completed modifications, the Year 2000 Issue will not have
a material adverse effect on its business, financial condition or results of
operations. However, even if these modifications are made in a timely fashion,
they still may not prevent a material adverse effect on the Company's business,
financial condition or results of operations. If such a material adverse effect
were to occur, the magnitude of it cannot be known at this time. The Company
currently has no contingency plans to deal with major Year 2000 failures,
although such plans will be developed over the coming quarters if they are
deemed necessary.

In addition to risks associated with the Company's own computer systems and
equipment, the Company has relationships with and is to varying degrees
dependent upon, a large number of third parties that provide information, goods
and services to the Company. These include corporate partners, suppliers,
vendors, financial institutions and governmental entities. These other
organizations may not adequately address the Year 2000 Issue and their failure
to address the Year 2000 Issue may have a material adverse effect on the
Company's business, financial condition or results of operations. The Company
has instituted a review of key third parties to assess their readiness to
address the Year 2000 Issue.

The total cost of systems assessments and modifications related to the Year 2000
Issue has been and is being funded through operating cash flows and has not been
material to date. The Company has been and is expensing these costs as incurred.
The Company has identified resources to address the Year 2000 Issue. The
aggregate financial impact to the Company of addressing the Year 2000 Issue
cannot be known precisely at this time, but it is currently expected to be less
than $2,000,000. The actual financial impact may exceed this estimate. The
financial impact is not expected to have a material adverse effect on the
Company's business, financial condition or results of operations.



ITEM 7A. FINANCIAL MARKET RISKS

The Company is exposed to interest rate risk on the investments of its excess
cash. The primary objective of the Company's investment activities is to
preserve principal while at the same time maximizing yields without
significantly increasing risk. To achieve this objective, the Company invests in
highly liquid and high quality debt securities. To minimize the exposure due to
adverse shifts in interest rates, the Company invests in short-term securities
and maintains an average maturity of less than 2 years. Due to the nature of its
short-term investments, the Company has concluded that it does not have a
material market risk exposure.



                                       29
<PAGE>   30



ITEM 8.  FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

REPORT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS

Board of Directors and Stockholders
COR Therapeutics, Inc.

We have audited the accompanying balance sheets of COR Therapeutics, Inc. 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 COR Therapeutics, Inc. at
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.



                                        ERNST & YOUNG LLP



Palo Alto, California
January 19, 1999




                                       30
<PAGE>   31


                             COR THERAPEUTICS, INC.
                                 BALANCE SHEETS
                      (in thousands, except per share data)

<TABLE>
<CAPTION>
                                                                                    December 31,
                                                                            ----------------------------
                                                                               1998               1997
                                                                            ---------          ---------
<S>                                                                         <C>                <C>      
                  ASSETS
Current assets:
Cash and cash equivalents                                                   $  10,532          $  22,209
Short-term investments                                                         64,673             60,360
Contract receivables                                                            2,398                422
Prepaid copromotion expenses                                                   19,236              6,422
Other current assets                                                              817                564
                                                                            ---------          ---------
Total current assets                                                           97,656             89,977

Property and equipment, net                                                     5,437              5,408
                                                                            ---------          ---------
                                                                            $ 103,093          $  95,385
                                                                            =========          =========

   LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
Accounts payable                                                            $   6,268          $   2,446
Accrued compensation                                                            4,516              2,510
Accrued development costs                                                       4,005              3,155
Accrued copromotion costs                                                       3,405              1,256
Deferred revenue                                                               23,494                886
Other accrued liabilities                                                       1,545              1,345
Long-term debt--current portion                                                   752                873
Capital lease obligations--current portion                                      1,251              1,699
                                                                            ---------          ---------
Total current liabilities                                                      45,236             14,170

Long-term debt--noncurrent portion                                              2,693              1,014
Capital lease obligations--noncurrent portion                                     568              1,803
Commitments and contingencies
Stockholders' equity:
Preferred stock, $.001 per share par value; 5,000 shares authorized                --                 --
Common stock, $.0001 per share par value; 40,000 shares
authorized; 24,431 and 23,767 shares issued and outstanding
at December 31, 1998 and December 31, 1997, respectively                            2                  2
Additional paid-in capital                                                    244,937            240,386
Deferred compensation                                                          (1,179)              (440)
Accumulated deficit                                                          (189,164)          (161,550)
                                                                            ---------          ---------
Total stockholders' equity                                                     54,596             78,398
                                                                            ---------          ---------
                                                                            $ 103,093          $  95,385
                                                                            =========          =========
</TABLE>


                            See accompanying notes.


                                       31
<PAGE>   32


                             COR THERAPEUTICS, INC.
                            STATEMENTS OF OPERATIONS
                    (in thousands, except per share amounts)

<TABLE>
<CAPTION>
                                                                                      Year Ended
                                                                                     December 31,
                                                                      --------------------------------------------
                                                                        1998              1997              1996
                                                                      --------          --------          --------
<S>                                                                   <C>                   <C>               <C> 
Contract revenues:
Copromotion revenue                                                   $  3,933              $ --              $ --
Milestones                                                              32,000             8,000            12,000
Development and other contract revenue                                   6,030            14,190             6,755
                                                                      --------          --------          --------
Total contract revenues                                                 41,963            22,190            18,755
                                                                      --------          --------          --------

Expenses:
Cost of copromotion revenue                                             11,803                --                --
Research and development                                                39,915            47,831            50,791
Marketing, general and administrative                                   21,474            10,067             7,303
                                                                      --------          --------          --------
Total expenses                                                          73,192            57,898            58,094
                                                                      --------          --------          --------

Loss from operations                                                   (31,229)          (35,708)          (39,339)

Interest income                                                          4,342             2,840             3,552
Interest expense                                                          (727)             (624)             (759)
                                                                      --------          --------          --------

Net loss                                                              $(27,614)         $(33,492)         $(36,546)
                                                                      ========          ========          ========

Basic and diluted net loss per share                                  $  (1.14)         $  (1.60)         $  (1.86)
                                                                      ========          ========          ========

Shares used in computing basic and diluted net loss per share           24,141            20,952            19,636
                                                                      ========          ========          ========
</TABLE>


                            See accompanying notes.

                                       32
<PAGE>   33


                             COR THERAPEUTICS, INC.
                       STATEMENTS OF STOCKHOLDERS' EQUITY
                   For the three years ended December 31, 1998
                                 (in thousands)


<TABLE>
<CAPTION>
                                                      Common Stock       Additional                                   Total
                                                 ---------------------    Paid-in     Deferred        Accumulated   Stockholders'
                                                   Shares    Par Value    Capital     Compensation     Deficit        Equity
                                                 ---------   ---------   ----------   ------------    -----------   -------------
<S>                                                <C>      <C>          <C>          <C>              <C>          <C>      
Balances at December 31, 1995                       19,429   $       2   $ 174,009    $    (262)       $ (91,512)   $  82,237
Issuance of common stock upon exercise                                                               
of stock options and pursuant to the                                                                 
Employee Stock Purchase Plan                           156          --         682           --               --          682
Deferred compensation related to stock awards,                                                       
net of cancellations and amortization                   25          --         270           13               --          283
Unrealized losses on available-for-sale                                                              
short-term investments                                  --          --        (214)          --               --         (214)
Issuance of common stock pursuant                                                                    
to collaboration agreement                             400          --       4,000           --               --        4,000
Net loss                                                --          --          --           --          (36,546)     (36,546)
                                                 ---------   ---------   ---------    ---------        ---------    ---------
Balances at December 31, 1996                       20,010           2     178,747         (249)        (128,058)      50,442
Issuance of common stock in a public offering                                                        
net of issuance costs of $4,459                      3,335          --      58,906           --               --       58,906
Issuance of common stock upon exercise                                                               
of stock options and pursuant to the                                                                 
Employee Stock Purchase Plan                           394          --       2,334           --               --        2,334
Deferred compensation related to stock awards,                                                       
net of cancellations and amortization                   28          --         439         (191)              --          248
Unrealized losses on available-for-sale                                                              
short-term investments                                  --          --         (40)          --               --          (40)
Net loss                                                --          --          --           --          (33,492)     (33,492)
                                                 ---------   ---------   ---------    ---------        ---------    ---------
Balances at December 31, 1997                       23,767           2     240,386         (440)        (161,550)      78,398
Issuance of common stock upon exercise                                                               
of stock options and pursuant to the                                                                 
Employee Stock Purchase Plan                           519          --       3,020           --               --        3,020
Deferred compensation related to stock awards,                                                       
net of cancellations and amortization                  145          --       1,361         (739)              --          622
Unrealized gains on available-for-sale                                                               
short-term investments                                  --          --         170           --               --          170
Net loss                                                --          --          --           --          (27,614)     (27,614)
                                                 ---------   ---------   ---------    ---------        ---------    ---------
Balances at December 31, 1998                       24,431   $       2   $ 244,937    $  (1,179)       $(189,164)   $  54,596
                                                 =========   =========   =========    =========        =========    =========
</TABLE>



                            See accompanying notes.


                                       33
<PAGE>   34



                             COR THERAPEUTICS, INC.
                            STATEMENTS OF CASH FLOWS
                Increase (decrease) in cash and cash equivalents
                                 (in thousands)

<TABLE>
<CAPTION>
                                                                      Year Ended
                                                                      December 31,
                                                           -----------------------------------
                                                              1998         1997         1996
                                                           ---------    ---------    ---------
<S>                                                        <C>          <C>          <C>       
Cash flows provided by (used in) operating activities:
Net loss                                                   $ (27,614)   $ (33,492)   $ (36,546)
Adjustments to reconcile net loss to net cash
used in operating activities:
Depreciation and amortization                                  3,358        3,545        3,593
Amortization of deferred compensation                            622          248          283
Changes in assets and liabilities:
Contract receivables                                          (1,976)       7,222       (3,270)
Prepaid copromotion expenses                                 (12,814)      (4,346)         936
Other current assets                                            (253)         780         (735)
Accounts payable                                               3,822        1,048         (157)
Accrued compensation                                           2,006        1,015         (433)
Accrued development costs                                        850       (4,675)       2,071
Accrued commercial costs                                       2,149        1,256           --
Deferred revenue                                              22,608       (2,014)       2,400
Other accrued liabilities                                        200          351         (992)
                                                           ---------    ---------    ---------
Total adjustments                                             20,572        4,430        3,696
                                                           ---------    ---------    ---------
Net cash used in operating activities                         (7,042)     (29,062)     (32,850)
                                                           ---------    ---------    ---------
Cash flows provided by (used in) investing activities:
Purchases of short-term investments                         (104,124)     (68,965)     (39,725)
Sales of short-term investments                               21,551       51,584       48,963
Maturities of short-term investments                          78,430        7,500       19,400
Additions to property and equipment                           (3,387)      (1,906)      (2,563)
                                                           ---------    ---------    ---------
Net cash provided by (used in) investing activities           (7,530)     (11,787)      26,075
                                                           ---------    ---------    ---------
Cash flows provided by (used in) financing activities:
Proceeds from long-term debt                                   2,601        1,243           --
Principal payments on long-term debt                          (1,043)      (1,157)      (1,321)
Proceeds from capital lease obligations                           83          701        1,854
Principal payments under capital lease obligations            (1,766)      (1,584)      (1,288)
Issuance of common stock                                       3,020       61,240        4,682
                                                           ---------    ---------    ---------
Net cash provided by financing activities                      2,895       60,443        3,927
                                                           ---------    ---------    ---------
Net increase (decrease) in cash and cash equivalents         (11,677)      19,594       (2,848)
Cash and cash equivalents at the beginning of the period      22,209        2,615        5,463
                                                           =========    =========    =========
Cash and cash equivalents at the end of the period         $  10,532    $  22,209    $   2,615
                                                           =========    =========    =========

Supplemental schedule of non-cash financing activities:
Cash paid during the period for interest                   $     727    $     624    $     759
                                                           =========    =========    =========

</TABLE>


                            See accompanying notes.

                                       34
<PAGE>   35


                          NOTES TO FINANCIAL STATEMENTS

1.       SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

COR Therapeutics, Inc. ("COR" or the "Company") was incorporated in Delaware on
February 4, 1988. COR is dedicated to the discovery, development and
commercialization of novel pharmaceutical products to establish new standards of
care for the treatment and prevention of severe cardiovascular diseases.

Cash, investments and credit risk

The Company is exposed to interest rate risk on the investments of its excess
cash. The primary objective of the Company's investment activities is to
preserve principal while at the same time maximizing yields without
significantly increasing risk. To achieve this objective, the Company invests in
highly liquid and high quality debt securities. To minimize the exposure due to
adverse shifts in interest rates, the Company invests in short-term securities
and maintains an average maturity of less than 2 years.

Securities available-for-sale

Management determines the appropriate classification of debt securities at the
time of purchase and reevaluates such designation as of each balance sheet date.
Debt securities have been classified as available-for-sale. Available-for-sale
securities are carried at fair value, with the unrealized gains and losses
reported in a separate component of stockholders' equity. The amortized cost of
debt securities in this category is adjusted for amortization of premiums and
accretion of discounts to maturity. Such amortization is included in interest
income. Realized gains and losses and declines in value judged to be other than
temporary on available-for-sale securities are included in interest income. The
cost of securities sold is based on the specific identification method. Interest
and dividends on securities classified as available-for-sale are included in
interest income.

Property and equipment

Property and equipment is stated at cost and depreciated over the estimated
useful lives of the assets, generally three to four years, using the
straight-line method. Assets under capitalized leases are amortized over the
shorter of the lease term or life of the asset. Property and equipment consists
of the following (in thousands):

<TABLE>
<CAPTION>
                                                               December 31,
                                                         ----------------------
                                                           1998          1997
                                                         --------      --------
<S>                                                      <C>           <C>     
Machinery and equipment                                  $ 14,935      $ 12,127
Office furniture and fixtures                                 974           887
Leasehold improvements                                     10,204         9,762
                                                         --------      --------
                                                           26,113        22,776
Less accumulated depreciation and amortization            (20,676)      (17,368)
                                                         --------      --------
Property and equipment, net                              $  5,437      $  5,408
                                                         ========      ========
</TABLE>

Contract Revenues

Contract revenues include milestone revenues, development-related revenues and
copromotion-related revenues. Milestone revenues, development and other contract
revenues are recorded as earned based on the performance requirements of the
contracts, while related costs are expensed as incurred. Copromotion-related
contract revenues are generally recognized at the time of shipment of related
product by Schering-Plough Ltd. and Schering Corporation (collectively,
"Schering") to wholesalers and are recorded net of allowances that management
believes are sufficient to cover future requirements.

Copromotion-related contract revenues for INTEGRILIN(TM) (eptifibatide)
Injection include the Company's share of profits, as defined in the agreement
with Schering, from the sales of INTEGRILIN by Schering, as well as the
reimbursement from Schering of the Company's costs of copromotion revenue, which
include certain manufacturing-related and



                                       35
<PAGE>   36


marketing expenses. Certain manufacturing-related copromotion expenses are
deferred until the time of shipment of related product by Schering to
wholesalers. Deferred revenue includes payments from Schering received prior to
the period in which the related contract revenues are earned. To the extent that
costs of copromotion revenue from prior periods have not been reimbursed to the
Company, reimbursements will be made by Schering from future sales of
INTEGRILIN(TM) (eptifibatide) Injection, if any.

Prepaid copromotion expenses

Prepaid copromotion expenses represent materials on-hand, valued at cost, and
deposits associated with manufacturing-related copromotion expenses. Prepaid
copromotion expenses consist of the following (in thousands):

<TABLE>
<CAPTION>
                                                              December 31,
                                                       -------------------------
                                                        1998              1997
                                                       -------           -------
<S>                                                    <C>               <C>    
Deposits and prepayments                               $10,637           $ 6,422
Bulk materials                                           6,900                --
Finished goods                                           1,699                --
                                                       -------           -------
                                                       $19,236           $ 6,422
                                                       =======           =======
</TABLE>

Concentration

The Company and Schering copromote one product, INTEGRILIN, in the United
States. The Company has established long-term supply arrangements with one
supplier for the bulk product and with another supplier for the filling and
final packaging of INTEGRILIN.

Net loss per share

In accordance with Financial Accounting Standards Board Statement of Financial
Accounting Standards No. 128, "Earnings Per Share" ("SFAS No. 128"), basic and
diluted net loss per share has been computed using the weighted average number
of shares of Common Stock outstanding during the period. Had the Company been in
a net income position, diluted earnings per share would have included the shares
used in the computation of basic net income per share as well as the impact of
outstanding options to purchase an additional 3,571,000 shares for the year
ended December 31, 1998, 3,649,000 shares for the year ended December 31, 1997
and 1,355,000 shares for the year ended December 31, 1996. Such shares have been
excluded because they are anti-dilutive for all periods presented.

Advertising and promotion costs

Advertising and promotion costs are expensed in the period they are incurred.
Advertising and promotion costs totaled $9,634,000 in 1998, $2,127,000 in 1997 
and $0 in 1996.


Use of estimates

The preparation of financial statements in conformity with generally accepted
accounting principles requires management to make estimates and assumptions that
affect the amounts reported in the financial statements and accompanying notes.
Actual results could differ from those estimates.

Accounting for stock-based compensation

The Company has elected to follow Accounting Principles Board Opinion No. 25,
"Accounting for Stock Issued to Employees" ("APB 25") and related
Interpretations in accounting for its employee stock options because, as
discussed in Note 6 below, the alternative fair value accounting provided for
under Statement of Financial Accounting Standards No. 123, "Accounting for
Stock-Based Compensation" ("SFAS No. 123"), requires use of option valuation
models that were not developed for use in valuing employee stock options. Under
APB 25, because



                                       36
<PAGE>   37



the exercise price of the Company's employee stock options equals the market
price of the underlying stock on the date of grant, no compensation expense is
recognized.

Reclassification

The Company has reclassified certain prior year balances to conform to current
year presentation.

Comprehensive Loss

In 1998, the Company adopted Statement of Financial Accounting Standards No.
130, "Reporting Comprehensive Income" ("SFAS 130.") SFAS 130 requires unrealized
gains and losses on the Company's available-for-sale securities to be included
in other comprehensive income. In 1998, 1997 and 1996 unrealized gains or losses
were not material and total comprehensive loss closely approximated net loss in
each fiscal year.

Segment Information

Effective January 1, 1998, the Company adopted Statement of Financial Accounting
Standards No. 131, "Disclosures about Segments of an Enterprise and Related
Information" ("SFAS No. 131.") SFAS No. 131 supersedes Statement of Financial
Accounting Standards No. 14, "Financial Reporting for Segments of a Business
Enterprise." SFAS No. 131 establishes standards for the way that public business
enterprises report information about operating segments in annual financial
statements and requires that those enterprises report selected information about
operating segments in interim financial reports. SFAS No. 131 also establishes
standards for related disclosures about products and services, geographic areas
and major customers.

The Company's business activities include the discovery, development and
commercialization of novel cardiovascular pharmaceutical products and have been
organized into one operating segment. All of the Company's operating assets are
located in the United States and all revenues are derived from within the United
States.



2.       COLLABORATION AGREEMENTS

Collaboration agreement with Schering-Plough Ltd. and Schering Corporation

In April 1995, the Company entered into a collaboration agreement with Schering
to jointly develop and commercialize INTEGRILIN(TM) (eptifibatide) Injection on
a worldwide basis. Under the terms of the agreement, the Company received a
one-time license fee of $20,000,000 in 1995. During the past three years, the
Company has recognized milestone revenues under the agreement as follows (in
thousands):

<TABLE>
<CAPTION>
                                                  1998          1997       1996
                                               ----------    ----------   ------
<S>                                            <C>           <C>          <C>   
Development-Related Milestone Revenues         $   32,000    $    8,000   $3,000
Safety-Related Milestone Revenues              $       --    $       --   $9,000
</TABLE>

During the past three years, the Company recorded contract revenues under this
agreement as follows (in thousands):

<TABLE>
<CAPTION>
                                                  1998         1997        1996
                                                 ------     ---------     ------
<S>                                              <C>        <C>           <C>   
Development-Related and Other Contract Revenues  $5,730     $  11,290     $6,635
Copromotion-Related Contract Revenues            $3,933     $      --     $   --
</TABLE>

The Company and Schering co-promote the drug in the United States and share any
profits or losses. Schering is responsible for the distribution of the final
product from manufacturers to wholesalers. In Europe, Schering has the right to
launch the product as an exclusive licensee on a royalty-bearing basis for a
period of time. Following this initial period, the Company has the right to
co-promote the product in Europe and share any profits or losses. In all
co-promotion territories, the exact profit-sharing ratio between the companies
depends on the amount of sales effort



                                       37
<PAGE>   38


contributed by each company. Outside of the United States, Canada and Europe,
Schering is the exclusive licensee on a royalty-bearing basis. Schering is
primarily responsible for regulatory filings outside the United States and
Canada. Schering participates in and shares the costs of continuing development
of INTEGRILIN(TM) (eptifibatide) Injection. Under the terms of the agreement,
both parties have certain rights to terminate for breach.



Collaboration Agreement with Kyowa Hakko Kogyo Co., Ltd.

In November 1992, the Company entered into a collaboration agreement with Kyowa
Hakko Kogyo Co., Ltd. ("Kyowa Hakko") focused on the discovery and development
of small molecule pharmaceuticals, primarily for the prevention of restenosis
following angioplasty. The collaboration targets a defined class of growth
factor inhibitors. This agreement has been amended several times and has been
extended until November 1999. Both companies have committed significant internal
resources to all phases of research. The Company has exclusive development and
marketing rights in the United States for any products resulting from the
collaboration and Kyowa Hakko has exclusive development and marketing rights in
Asia for any such products. The companies have agreed to develop and
commercialize jointly any such products on a shared economic basis in the rest
of the world. The agreement further provides that Kyowa Hakko will have the
exclusive right to develop and commercialize small molecule products for
indications related solely to a single, defined non-cardiovascular disease
indication outside of the United States.

Collaboration Agreement with Ortho Pharmaceutical Corporation

In December 1993, the Company entered into a collaboration agreement with Ortho
Pharmaceutical Corporation ("Ortho") focusing on the joint discovery,
development and commercialization of novel pharmaceuticals that may result from
collaborative research on the thrombin receptor. This agreement was amended in
September 1996. The Company and Ortho each provided specified levels of internal
resources to the collaborative research over the initial three-year research
term. In 1997, the Company recognized $2,400,000 in development-related contract
revenues under this agreement. The research term expired in December 1998.



3.       FINANCIAL INSTRUMENTS

The following methods and assumptions were used by the Company in estimating its
fair value disclosures for financial instruments:

Cash and cash equivalents: The carrying amount of cash and cash equivalents
reported on the balance sheet approximates its fair value.

Short-term investments: Short-term investments consist of marketable debt
securities and are classified as available-for-sale. These investments are
carried at fair value and any unrealized gains and losses are reported in a
separate component of stockholders' equity. The fair values are based upon
quoted market prices.

At December 31, 1998, short-term investments were as follows (in thousands):

<TABLE>
<CAPTION>
                                      Amortized  Unrealized Unrealized  Estimated
                                         Cost      Gains     Losses     Fair Value
                                      ---------  ---------- ----------  ----------
<S>                                   <C>        <C>        <C>         <C>    
U.S. government securities             $22,793    $   116    $    (1)    $22,908
Corporate debt obligations              41,683         89         (7)     41,765
                                       -------    -------    -------     -------
                                       $64,476    $   205    $    (8)    $64,673
                                       =======    =======    =======     =======
</TABLE>

During the year ended December 31, 1998, the Company sold short-term investments
with a fair value of $21,551,000, resulting in gross realized gains of $44,000
and gross realized losses of $22,000.



                                       38
<PAGE>   39



The amortized cost and estimated fair value of short-term investments at
December 31, 1998, classified by contractual maturity, were as follows (in
thousands):

<TABLE>
<CAPTION>
                                                           Amortized    Estimated
                                                              Cost      Fair Value
                                                           ---------    ----------
<S>                                                        <C>          <C>    
Due in one year or less                                     $38,400      $38,454
Due after one year and in less than 3 years                  26,076       26,219
                                                            -------      -------
                                                            $64,476      $64,673
                                                            =======      =======
</TABLE>

At December 31, 1997, short-term investments were as follows (in thousands):

<TABLE>
<CAPTION>
                                      Amortized  Unrealized Unrealized  Estimated
                                        Cost       Gains      Losses    Fair Value
                                      ---------  ---------- ----------  ----------
<S>                                   <C>        <C>        <C>         <C>    
U.S. government securities             $ 1,516    $    --    $    (1)    $ 1,515
Corporate debt obligations              58,817         30         (2)     58,845
                                       -------    -------    -------     -------
                                       $60,333    $    30    $    (3)    $60,360
                                       =======    =======    =======     =======
</TABLE>

During the year ended December 31, 1997, the Company sold short-term investments
with a fair value of $51,584,000, resulting in gross realized gains of $38,000
and gross realized losses of $86,000.

Long and short-term debt: The carrying amounts of the Company's borrowings under
its secured debt agreements approximate their fair values. The fair values are
estimated using a discounted cash flow analysis based on the Company's current
incremental borrowing rates for similar types of borrowing arrangements.



4.       LONG-TERM DEBT

Long-term debt consists of various secured obligations related to the purchase
of property and equipment. Such notes are secured by the underlying property and
equipment, bear interest at approximately 7.9% to 13.5% per annum and are
payable in monthly installments over 48 months.

At December 31, 1998, aggregate long-term debt maturities were $752,000 in 1999,
$859,000 in 2000, $914,000 in 2001 and $920,000 in 2002.




                                       39
<PAGE>   40



5.       LEASE OBLIGATIONS

The Company leases office and laboratory facilities and equipment. Rent expense
for operating leases was approximately $2,521,000 in 1998, $1,656,000 in 1997
and $1,212,000 in 1996. Future minimum lease payments under non-cancelable
leases are as follows (in thousands):

<TABLE>
<CAPTION>
                                                          Capital      Operating
                                                          Leases         Leases
                                                         ---------     ---------
<S>                                                      <C>           <C>      
1999                                                     $   1,407     $   2,197
2000                                                           537         1,728
2001                                                            63         1,728
2002                                                            --         1,728
2003                                                            --         1,728
Thereafter                                                      --         1,727
                                                         ---------     ---------
Total minimum lease payments                                 2,007     $  10,836
                                                                       =========
Less amount representing interest                             (188)
                                                         ---------
Present value of future lease payments                       1,819
Less current portion                                        (1,251)
                                                         ---------
Noncurrent portion of capital lease obligations          $     568
                                                         =========
</TABLE>

The aggregate and net values of property and equipment under capital lease are
as follows (in thousands):

<TABLE>
<CAPTION>
                                                               December 31,
                                                           --------------------
                                                             1998         1997
                                                           -------      -------
<S>                                                        <C>          <C>    
Aggregate value of assets under capital lease              $ 9,475      $ 6,977
Accumulated amortization                                    (5,535)      (5,336)
                                                           -------      -------
Net value of assets under capital lease                    $ 3,940      $ 1,641
                                                           =======      =======
</TABLE>

At December 31, 1998, the Company had approximately $4,000,000 available under
an equipment financing facility.



6.       STOCKHOLDERS' EQUITY

Stock option plans

In 1988, the Company adopted the 1988 Employee Stock Option Plan and the 1988
Consultant Stock Option Plan (collectively, the "1988 Plans.") Under these
plans, the Company granted both incentive and non-qualified stock options to
employees and consultants. The exercise prices were set at no less than the fair
market value of the Company's stock on the date of grant and the options became
exercisable based upon the individual terms of the grant.

In 1991, the Company terminated the 1988 Plans and adopted the 1991 Equity
Incentive Plan. Under this plan, the Company has granted (and continues to
grant) stock options and stock awards to employees and consultants. The exercise
prices are set at no less than the fair market value of the Company's stock on
the date of grant. The options generally vest over a period of 60 months and are
exercisable to the extent that they are vested.

In 1994, the Company adopted the 1994 Non-Employee Directors' Stock Option Plan.
Under this plan, the Company may make grants of non-qualified options to Board
members who are neither employees nor consultants to the Company. The exercise
prices are set at no less than the fair market value of the Company's stock on
the date of grant. The options generally vest over a period of 60 months and
are exercisable to the extent vested.

In 1998, the Company adopted the 1998 Non-Officer Equity Incentive Plan. Under
this plan, the Company may grant non-qualified stock options and stock awards to
employees who are not officers of the Company. The exercise



                                       40
<PAGE>   41



prices are set at no less than the fair market value of the Company's stock on
the date of grant. The options generally vest over a period of 60 months and are
exercisable to the extent vested.

During the past three years, options under these plans were vested and
exercisable as follows:

<TABLE>
<CAPTION>
                                                              December 31,
                                                 ---------------------------------------
                                                     1998          1997          1996
                                                 -----------   -----------   -----------
<S>                                              <C>           <C>           <C>        
Exercisable Shares:
1988 Employee Stock Option Plan                      309,270       499,156       664,049
1988 Consultant Stock Option Plan                     59,167        72,167        82,167
1991 Equity Incentive Plan                         2,193,974     1,766,526     1,406,504
1994 Non-Employee Directors' Stock Option Plan        84,166        83,749        58,749
1998 Non-Officer Equity Incentive Plan                37,635            --            --
                                                 -----------   -----------   -----------
                                                   2,684,212     2,421,598     2,211,469
                                                 ===========   ===========   ===========
Aggregate Exercise Price:
1988 Employee Stock Option Plan                  $   338,000   $   410,000   $   476,000
1988 Consultant Stock Option Plan                     24,000        28,000        31,000
1991 Equity Incentive Plan                        26,926,000    21,767,000    17,692,000
1994 Non-Employee Directors' Stock Option Plan     1,209,000     1,238,000       878,000
1998 Non-Officer Equity Incentive Plan               545,000            --            --
                                                 -----------   -----------   -----------
                                                 $29,042,000   $23,443,000   $19,077,000
                                                 ===========   ===========   ===========
</TABLE>

During the past three years, activity under these plans was as follows:

<TABLE>
<CAPTION>
                                                               Options Outstanding
                                                         --------------------------------
                                      Shares
                                     Available            Number of      Weighted Average
                                     for Grant            Shares          Exercise Price
                                     ----------          ----------      ----------------
<S>                                  <C>                 <C>             <C>   
Balance at December 31, 1995            249,872           3,413,091          $ 9.68
Stock awards                            (25,678)                 --          $   --
Additional shares authorized          1,500,000                  --          $   --
Options granted                        (857,000)            857,000          $ 9.22
Options forfeited                       303,856            (303,856)         $13.28
Options exercised                            --             (77,600)         $ 0.41
                                     ----------          ----------          ------
Balance at December 31, 1996          1,171,050           3,888,635          $ 9.45
Stock awards                            (28,296)                 --          $   --
Additional shares authorized            600,000                  --          $   --
Options granted                      (1,046,750)          1,046,750          $13.24
Options forfeited                       217,932            (217,932)         $11.34
Options exercised                            --            (304,922)         $ 5.23
                                     ----------          ----------          ------
Balance at December 31, 1997            913,936           4,412,531          $10.64
Stock awards                           (161,941)                 --          $   --
Additional shares authorized            450,000                  --          $   --
Options granted                        (731,750)            731,750          $13.56
Options forfeited                       223,596            (223,596)         $13.04
Options exercised                            --            (320,579)         $ 4.39
                                     ----------          ----------          ------
Balance at December 31, 1998            693,841           4,600,106          $13.30
                                     ==========          ==========          ======
</TABLE>

The Company recorded deferred compensation related to stock awards, net of
forfeitures, of $1,361,000 in 1998, $439,000 in 1997 and $270,000 in 1996. The
Company amortized deferred compensation of $622,000 in 1998, $248,000 in 1997
and $283,000 in 1996.



                                       41
<PAGE>   42


The weighted-average grant-date fair value of options granted was $10.51 in 
1998, $9.84 in 1997 and $6.69 in 1996.

The following table summarizes information about stock options outstanding at
December 31, 1998:

<TABLE>
<CAPTION>
                                           Weighted
                                           Average
                        Number of         Remaining          Weighted          Number of          Weighted
     Range of            Options         Contractual     Average Exercise       Options       Average Exercise
 Exercise Prices       Outstanding       Life (years)          Price          Exercisable           Price
 ----------------      -----------       ------------    ----------------     -----------     ----------------
<S>                    <C>               <C>             <C>                  <C>             <C>     
 $  0.30 - $ 8.56         787,997          4.02             $   5.00              520,359        $   3.19
 $  9.06 - $11.19       1,108,799          7.21             $   9.99              524,991        $  10.26
 $ 11.38 - $12.50       1,092,635          5.73             $  12.22              880,687        $  12.19
 $ 12.75 - $15.31         975,450          6.86             $  13.71              516,252        $  14.12
 $ 15.38 - $21.00         635,225          8.07             $  16.81              241,923        $  16.41
 ----------------       ---------          ----             --------            ---------        --------
 $  0.30 - $21.00       4,600,106          6.36             $  11.40            2,684,212        $  10.82
 ================       =========          ====             ========            =========        ========
</TABLE>

Stock purchase plan

In 1991, the Company adopted the 1991 Employee Stock Purchase Plan. Under this
plan, full-time employees may contribute up to 15% of their compensation to
purchase Common Stock at 85% of its fair market value on specified dates. The
Board of Directors has authorized 1,050,000 shares for issuance under the stock
purchase plan.

During the past three years, the Company has issued Common Stock under the stock
purchase plan as follows:

<TABLE>
<CAPTION>
                                     Shares           Range
For the year ended                   Issued         of Prices
- ------------------                 ----------   ------------------
<S>                                <C>          <C>   
December 31, 1998                    182,428      $6.22 - $17.56
                                                
December 31, 1997                     88,383      $7.28 - $ 9.03
                                                
December 31, 1996                     80,276      $7.28 - $ 8.82
</TABLE>


Pro forma valuation of options

The Company has elected to follow APB 25 and related Interpretations in
accounting for employee stock options (see Note 1, "Summary of significant
accounting policies.") Under APB 25, the Company does not recognize any
compensation expense related to the grants of stock options because the exercise
price of the Company's stock options are equal to the fair market value of the
Company's stock on the date of grant.

Pro forma information regarding net loss and net loss per share is required by
SFAS No. 123. The Company has used the fair value method described in SFAS No.
123 to determine this pro forma information for all employee stock options
granted after December 31, 1994. The fair value method was also applied to
shares acquired through the Company's stock purchase plan which, for the
purposes of this disclosure, the Company has treated as employee stock options.
The fair value of the Company's employee stock options was estimated at the date
of grant and/or purchase using the Black-Scholes option-pricing model. During
the past three years, the Company has used the following weighted average
assumptions in the Black-Scholes model:

<TABLE>
<CAPTION>
                                 1998          1997          1996
                                 ----          ----          ----
<S>                              <C>           <C>           <C>  
Risk-free interest rate           5.23%         6.21%         6.06%
Dividends                          None          None          None
Volatility                        0.77          0.69          0.73
Expected life                     5 yrs         5 yrs         5 yrs
</TABLE>

The Black-Scholes model was developed to estimate the fair value of traded
options. Traded options, however, have no vesting restrictions and are fully
transferable. Additionally, the model requires the input of highly subjective



                                       42
<PAGE>   43


assumptions. Because the Company's employee stock options have characteristics
significantly different from traded options and because slight changes in the
input assumptions can materially affect the fair value estimate, the Company
does not believe that the Black-Scholes model provides a reliable measure of the
fair value of the Company's employee stock options. Additionally, the effects of
applying SFAS No. 123 for the recognition of compensation expense and provision
of pro forma disclosures in 1998, 1997 and 1996 are not likely to be
representative of the effects on reported and pro forma net income in future
years because options vest over several years and additional awards may be made
in subsequent years.

Per SFAS No. 123, the Company has amortized the expense of the estimated fair
value over an option's vesting period. During the past three years, the
Company's pro forma expense has been as follows (in thousands except for the net
loss per share information):

<TABLE>
<CAPTION>
                                                                    For the Year Ended December 31,
                                                           --------------------------------------------------
                                                              1998                1997                1996
                                                           ----------          ----------          ----------
<S>                                                        <C>                 <C>                 <C>        
Net loss (as reported)                                     $  (27,614)         $  (33,492)         $  (36,546)
Basic and diluted net loss per share (as reported)         $    (1.14)         $    (1.60)         $    (1.86)
Pro forma net loss                                         $  (35,223)         $  (39,677)         $  (40,967)
Pro forma basic and diluted net loss per share             $    (1.46)         $    (1.89)         $    (2.09)
</TABLE>

Common shares reserved for future issuance

At December 31, 1998, 5,441,639 shares of Common Stock were reserved for future
issuance under the stock option and stock purchase plans.



7.       INCOME TAXES

At December 31, 1998, the Company had available net loss carryforwards for
federal income tax purposes of approximately $178,900,000. The tax loss
carryforwards, if not utilized to offset taxable income in future periods,
expire between the years 2003 and 2018. Significant components of the Company's
deferred tax assets and liabilities for federal income taxes at December 31,
1998 and 1997 were as follows (in thousands):

<TABLE>
<CAPTION>
                                                              December 31,
                                                    --------------------------
                                                      1998              1997
                                                   ---------         ---------
<S>                                                <C>              <C>      
Net operating loss carryforwards                   $  61,700         $  52,700
Capitalized research and development                   9,500             8,600
Research and development credits
    (expiring between 2003 and 2018)                   5,300             5,300
Other, net                                             5,300             2,200
                                                   ---------         ---------
Net deferred tax assets                               81,800            68,800
Valuation allowance for deferred tax assets          (81,800)          (68,800)
                                                   ---------         ---------
    Deferred tax assets                            $      --         $      --
                                                   =========         =========
</TABLE>


The valuation allowance for deferred tax assets increased by $10,900,000 and
$13,100,000 during the years ended December 31, 1997 and 1996, respectively.

Because of "change of ownership" provisions of the Tax Reform Act of 1986, the
Company's net operating loss and credit carryforwards may be subject to an
annual limitation regarding utilization against taxable income in future
periods.







                                       43
<PAGE>   44

8.       CONTINGENCIES


In October 1997, a patent opposition was filed in Europe by another company
against the claims of a patent granted to the Company in Europe covering broad,
generic claims for INTEGRILIN(TM) (eptifibatide) Injection, as well as numerous
related compounds that are not part of the Company's core technology. The
opposition asserts that all claims of the patent are unpatentable. The Company
intends to vigorously defend its patent. However, this patent opposition may
result in an unfavorable outcome.

In May 1998, a plaintiff voluntarily dismissed all claims against the Company
and Vaughn M. Kailian, the Company's Chief Executive Officer, in a putative
class action lawsuit that had alleged violation of federal securities laws.



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

Not applicable.




                                       44
<PAGE>   45



                                    PART III

ITEM 10. DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT



IDENTIFICATION OF DIRECTORS

The information required by this Item concerning the Company's directors is
incorporated by reference from the sections captioned "Proposal 1: Election of
Directors" contained in the Company's Definitive Proxy Statement related to the
Annual Meeting of Stockholders to be held May 25, 1999, to be filed by the
Company with the Securities and Exchange Commission (the "Proxy Statement.")
William Younger, Jr. resigned from the Company's Board of Directors effective
March 20, 1998.



IDENTIFICATION OF EXECUTIVE OFFICERS

The information required by this Item concerning the Company's executive
officers is set forth in Item I of this Report.



SECTION 16(a) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE

The information required by this Item is incorporated by reference from the
section captioned "Section 16(a) Beneficial Ownership Reporting Compliance"
contained in the Proxy Statement.



ITEM 11. EXECUTIVE COMPENSATION

The information required by this Item is incorporated by reference from the
section captioned "Executive Compensation" contained in the Proxy Statement.



ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

The information required by this Item is incorporated by reference from the
section captioned "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
sections captioned "Certain Transactions" and "Executive Compensation" contained
in the Proxy Statement.



                                       45
<PAGE>   46


                                    PART IV

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



         (A)      1.       INDEX TO FINANCIAL STATEMENTS 

<TABLE>
<CAPTION>
                                                                                                         Page in
                                                                                                        Form 10-K
                                                                                                      --------------
<S>                                                                                                    <C>
         Report of Ernst & Young LLP, Independent Auditors                                             30
         Balance Sheets at December 31, 1998 and 1997                                                  31
         Statements of Operations for the years ended December 31, 1998, 1997 and 1996                 32
         Statements of  Stockholders'  Equity for the years ended December 31, 1998, 1997 and 1996     33
         Statements of Cash Flows for the years ended December 31, 1998, 1997 and 1996                 34
         Notes to Financial Statements                                                                 35
</TABLE>


                  2.       All schedules are omitted because they are not
                           applicable or not required or because the required
                           information is included in the financial statements
                           or notes thereto.



                  3.       EXHIBITS

<TABLE>
<CAPTION>
                             Number          Exhibit
                           -----------       -----------------------------------------------------------------------
<S>                                          <C>                                                                
                              3.1(9)         Restated Certificate of Incorporation of the Registrant.
                              3.2(2)         By-laws of the Registrant.
                              4.1            Reference is made to Exhibits 3.1 and 3.2.
                              4.2(2)         Information, Registration
                                             Rights and Right of First Refusal
                                             Agreement among the Registrant and
                                             other parties named therein, as
                                             amended as of May 15, 1991.
                              4.3(2)         Side by Side Agreement among the Registrant and the other parties
                                             named therein.
                              4.4(8)         Registrant's Preferred Share Purchase Rights Agreement between the
                                             Registrant and Chemical Trust Company of California, dated as of
                                             January 23, 1995.
                          *  10.1(2)         Form of Indemnification Agreement between the Registrant and its
                                             directors, executive officers and officers.
                          *  10.2(2)         Registrant's 1988 Employee Stock Option Plan and related agreements.
                          *  10.3(2)         Registrant's 1988 Consultant Stock Option Plan and related
                                             agreements.
                        ++*  10.4(2)         Research, Option and License Agreement between the Registrant and Eli
                                             Lilly and Company, dated May 1, 1991.
                          *  10.5(2)         Lease Agreement between the Registrant and NC Land Associates Limited
                                             Partnership, dated September 23, 1988, as amended August 30, 1989 and
                                             Lease Rider, dated September 23, 1988.
                             10.6(1)         Forms of option agreements used under the Registrant's 1991 Equity
                                             Incentive Plan.
                             10.7(3)         Form of offering document used under the Registrant's 1991 Employee
                                             Stock Purchase Plan.
                         ++  10.8(4)         Consulting Agreement between the Registrant and Lloyd Hollingsworth
                                             Smith, Jr., dated January 1, 1993.
</TABLE>

                                       46

<PAGE>   47

<TABLE>
<CAPTION>
                             Number          Exhibit
                           -----------       -----------------------------------------------------------------------
<S>                                          <C>                                                                
                      ++     10.9(4)         Collaboration Research Agreement between the Registrant and Kyowa
                      ++                     Hakko Kogyo, Co., Ltd., dated November 30, 1992.
                      ++    10.10(5)         Collaboration Agreement between Eli Lilly and Company and the
                                             Registrant, dated May 28, 1993.
                     ++*    10.11(6)         Collaboration Agreement between Ortho Pharmaceutical Corporation and
                                             the Registrant, dated December 21, 1993.
                            10.12(10)        Registrant's 1994 Non-employee Directors' Stock Option Plan, as
                                             amended.
                            10.13(7)         Consulting Agreement between
                                             the Registrant and Shaun R.
                                             Coughlin, dated March 17, 1988, as
                                             amended effective September 28,
                                             1994.
                            10.14(10)        Registrant's 1991 Stock Purchase Plan, as amended.
                            10.15(10)        Registrant's 1991 Equity Incentive Plan, as amended.
                      ++    10.16(8)         Collaboration Agreement between Schering-Plough Ltd., Schering
                                             Corporation and the Registrant, dated April 10, 1995.
                      ++    10.17(9)         Amendment No. 4 to Collaboration Research Agreement between the
                                             Registrant and Kyowa Hakko Kogyo, Co., Ltd., dated November 10, 1995.
                      ++    10.18(10)        Amendment No. 1 to Collaboration Research Agreement between Ortho
                                             Pharmaceutical Corporation and the Registrant, dated September 27,
                                             1996.
                      ++    10.19(10)        Amendment No. 1 to Collaboration Research Agreement between Eli Lilly
                                             and Company and the Registrant, dated November, 1996.
                      ++    10.20(i)(10)     Amendment No. 1 to Collaboration Research Agreement between the
                                             Registrant and Kyowa Hakko Kogyo Co., Ltd., dated May 9, 1994.
                      ++    10.20(ii)(10)    Amendment No. 2 to Collaboration Research Agreement between the
                                             Registrant and Kyowa Hakko Kogyo Co., Ltd., dated July 13, 1995.
                      ++    10.20(iii)(10)   Amendment No. 3 to Collaboration Research Agreement between the
                                             Registrant and Kyowa Hakko Kogyo Co., Ltd., dated August 1, 1995.
                      ++    10.20(iv)(10)    Amendment No. 5 to Collaboration Research Agreement between the
                                             Registrant and Kyowa Hakko Kogyo Co., Ltd., dated December 17, 1996.
                            10.21(10)        Description of Registrant's 1996 Incentive Pay Plan.
                      ++    10.22(11)        Long Term Supply Agreement between Registrant and Solvay, Societe
                                             Anonyme, dated September 28, 1995.
                      ++    10.23(11)        Amendment No. 1 to the Long Term Supply Agreement between Registrant
                                             and Solvay, Societe Anonyme, as amended, dated April 1, 1997.
                      ++    10.24(11)        License and Supply Agreement between the Registrant and Solvay,
                                             Societe Anonyme, dated July 27, 1994.
                      ++    10.25(11)        First Amendment to the License and Supply Agreement between
                                             Registrant and Solvay, Societe Anonyme, as amended, dated March 13,
                                             1995.
                      ++    10.26(11)        Second Amendment to the License and Supply Agreement between
                                             Registrant and Solvay, Societe Anonyme, as amended, dated June 1,
                                             1995.
                      ++    10.27(11)        Third Amendment to the License and Supply Agreement between
                                             Registrant and Solvay, Societe Anonyme, as amended, dated September
                                             5, 1995.
                      ++    10.28(11)        Letter Amendment to the License and Supply Agreement between
                                             Registrant and Solvay, Societe Anonyme, as amended, dated June 6,
                                             1996.
                      ++    10.29(11)        Fourth Amendment to the License and Supply Agreement between
                                             Registrant and Solvay, Societe Anonyme, as amended, dated April 1,
                                             1997.
</TABLE>

                                       47

<PAGE>   48

<TABLE>
<CAPTION>
                             Number          Exhibit
                           -----------       -----------------------------------------------------------------------
<S>                                          <C>                                                                
                            10.31            1998 Non-Officer Equity Incentive Plan.

                            10.32            Form of Option Agreements used for the 1998 Non-Officer Equity
                                             Incentive Plan
                       +    10.33            Amendment to Collaboration Agreement, dated December 23, 1998,
                                             between Schering-Plough Ltd. and Schering Corporation and the
                                             Registrant.
                             23.1            Consent of Ernst & Young LLP, Independent Auditors.
                             24.1            Power of Attorney, Reference is made to the signature page.
                             27.1            Financial Data Schedule.
</TABLE>


*        Indicates management contracts or compensatory plans
         or arrangements filed pursuant to Item 601(b)(10) of
         Regulation S-K.

+        Confidential treatment requested.

++       Confidential treatment granted.

(1)      Filed as an exhibit to the Registrant's Registration Statement on 
         Form S-8 (Reg. No. 33-42912) and incorporated herein by reference.

(2)      Filed as an exhibit to the  Registrant's Registration Statement on 
         Form S-1 (Reg. No. 33-40627) or amendments thereto and incorporated 
         herein by reference.

(3)      Filed as an exhibit to the Registrant's Registration Statement on 
         Form S-1 (Reg. No. 33-43181) or amendments thereto and incorporated
         herein by reference.

(4)      Filed as an exhibit to the Registrant's Annual Report
         on Form 10-K for the period ended December 31, 1992
         and incorporated by reference herein.

(5)      Filed as an exhibit to the Registrant's Quarterly
         Report on Form 10-Q for the period ended June 30,
         1993 and incorporated by reference herein.

(6)      Filed as an exhibit to the Registrant's Annual Report
         on Form 10-K for the period ended December 31, 1993
         and incorporated by reference herein.

(7)      Filed as an exhibit to the Registrant's Annual Report
         on Form 10-K for the period ended December 31, 1994
         and incorporated by reference herein.

(8)      Filed as an exhibit to the Registrant's Quarterly
         Report on Form 10-Q for the period ended June 30,
         1995 and incorporated by reference herein.

(9)      Filed as an exhibit to the Registrant's Annual Report
         on Form 10-K for the period ended December 31, 1995
         and incorporated by reference herein.

(10)     Filed as an exhibit to the Registrant's Annual Report
         on Form 10-K for the period ended December 31, 1996
         and incorporated by reference herein.

(11)     Filed as an exhibit to the Registrant's Quarterly
         Report on Form 10-Q for the period ended September
         30, 1998 and incorporated by reference herein.


(B)      REPORTS ON FORM 8-K

         There were no reports on Form 8-K filed for the quarter ended December
31, 1998.



                                       48
<PAGE>   49



SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Act of
1934, the Registrant has duly caused this Report to be signed on its behalf by
the undersigned, thereunto duly authorized, in the City of South San Francisco,
County of San Mateo, State of California, on the XXth day of March, 1999.

                                          COR THERAPEUTICS, INC.

                                 By       /s/ PETER S. RODDY
                                          --------------------------------------
                                          Peter S. Roddy
                                          Vice President, Finance
                                          (Principal Accounting Officer)

POWER OF ATTORNEY

KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears
below constitutes and appoints Peter S. Roddy and Laura A. Brege, and each of
them, as his true and lawful attorneys-in-fact and agents, with full power of
substitution for him, and in his name in any and all capacities, to sign any and
all amendments to this Report, and to file the same, with exhibits thereto and
other documents in connection therewith, with the Securities and Exchange
Commission, granting unto said attorneys-in-fact and agents, and each of them,
full power and authority to do and perform each and every act and thing
requisite and necessary to be done therewith, as fully to all intents and
purposes as he might or could do in person, hereby ratifying and confirming all
that said attorneys-in-fact and agents, and any of them or his substitute or
substitutes, may lawfully do or cause to be done by virtue hereof.

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:

<TABLE>
<CAPTION>
Signature                                                         Title                               Date
- ----------------------------------                ----------------------------------------         --------------
<S>                                               <C>                                              <C>

/s/ VAUGHN M. KAILIAN                             President, Chief Executive Officer and           March 23, 1999
- ---------------------------------                 Director (Principal Executive Officer)
Vaughn M. Kailian                

/s/ LAURA A. BREGE                                Senior Vice President, Finance and Chief         March 23, 1999
- ---------------------------------
Laura A. Brege                                    Financial Officer (Principal Financial
                                                  Officer)

/s/ CHARLES J. HOMCY                              Executive Vice President, Research and           March 23, 1999
- ---------------------------------                 Development and Director
Charles J. Homcy                      

/s/ PETER S. RODDY                                Vice President, Finance (Principal               March 23, 1999
- ---------------------------------                 Accounting Officer)
Peter S. Roddy                                    

/s/ SHAUN R. COUGHLIN                             Director                                         March 23, 1999
- ---------------------------------
Shaun R. Coughlin

/s/ JAMES T. DOLUISIO                             Director                                         March 23, 1999
- ---------------------------------
James T. Doluisio

/s/ JERRY T. JACKSON                              Director                                         March 23, 1999
- ---------------------------------
Jerry T. Jackson

/s/ ERNEST MARIO                                  Director                                         March 23, 1999
- ---------------------------------
Ernest Mario

/s/ ROBERT R. MOMSEN                              Director                                         March 23, 1999
- ---------------------------------
Robert R. Momsen

/s/ LLOYD HOLLINGSWORTH SMITH, JR.                Director                                         March 23, 1999
- ---------------------------------
Lloyd Hollingsworth Smith, Jr.

</TABLE>



                                       49
<PAGE>   50


                                 EXHIBIT INDEX


<TABLE>
<CAPTION>
                             Number          Exhibit
                           -----------       -----------------------------------------------------------------------
<S>                                          <C>                                                                
                              3.1(9)         Restated Certificate of Incorporation of the Registrant.
                              3.2(2)         By-laws of the Registrant.
                              4.1            Reference is made to Exhibits 3.1 and 3.2.
                              4.2(2)         Information, Registration
                                             Rights and Right of First Refusal
                                             Agreement among the Registrant and
                                             other parties named therein, as
                                             amended as of May 15, 1991.
                              4.3(2)         Side by Side Agreement among the Registrant and the other parties
                                             named therein.
                              4.4(8)         Registrant's Preferred Share Purchase Rights Agreement between the
                                             Registrant and Chemical Trust Company of California, dated as of
                                             January 23, 1995.
                       *     10.1(2)         Form of Indemnification Agreement between the Registrant and its
                                             directors, executive officers and officers.
                       *     10.2(2)         Registrant's 1988 Employee Stock Option Plan and related agreements.
                       *     10.3(2)         Registrant's 1988 Consultant Stock Option Plan and related
                                             agreements.
                     ++*     10.4(2)         Research, Option and License Agreement between the Registrant and Eli
                                             Lilly and Company, dated May 1, 1991.
                       *     10.5(2)         Lease Agreement between the Registrant and NC Land Associates Limited
                                             Partnership, dated September 23, 1988, as amended August 30, 1989 and
                                             Lease Rider, dated September 23, 1988.
                             10.6(1)         Forms of option agreements used under the Registrant's 1991 Equity
                                             Incentive Plan.
                             10.7(3)         Form of offering document used under the Registrant's 1991 Employee
                                             Stock Purchase Plan.
                      ++     10.8(4)         Consulting Agreement between the Registrant and Lloyd Hollingsworth
                                             Smith, Jr., dated January 1, 1993.
</TABLE>


<PAGE>   51

<TABLE>
<CAPTION>
                             Number          Exhibit
                           -----------       -----------------------------------------------------------------------
<S>                                          <C>                                                                
                      ++     10.9(4)         Collaboration Research Agreement between the Registrant and Kyowa
                      ++                     Hakko Kogyo, Co., Ltd., dated November 30, 1992.
                      ++    10.10(5)         Collaboration Agreement between Eli Lilly and Company and the
                                             Registrant, dated May 28, 1993.
                     ++*    10.11(6)         Collaboration Agreement between Ortho Pharmaceutical Corporation and
                                             the Registrant, dated December 21, 1993.
                            10.12(10)        Registrant's 1994 Non-employee Directors' Stock Option Plan, as
                                             amended.
                            10.13(7)         Consulting Agreement between
                                             the Registrant and Shaun R.
                                             Coughlin, dated March 17, 1988, as
                                             amended effective September 28,
                                             1994.
                            10.14(10)        Registrant's 1991 Stock Purchase Plan, as amended.
                            10.15(10)        Registrant's 1991 Equity Incentive Plan, as amended.
                      ++    10.16(8)         Collaboration Agreement between Schering-Plough Ltd., Schering
                                             Corporation and the Registrant, dated April 10, 1995.
                      ++    10.17(9)         Amendment No. 4 to Collaboration Research Agreement between the
                                             Registrant and Kyowa Hakko Kogyo, Co., Ltd., dated November 10, 1995.
                      ++    10.18(10)        Amendment No. 1 to Collaboration Research Agreement between Ortho
                                             Pharmaceutical Corporation and the Registrant, dated September 27,
                                             1996.
                      ++    10.19(10)        Amendment No. 1 to Collaboration Research Agreement between Eli Lilly
                                             and Company and the Registrant, dated November, 1996.
                      ++    10.20(i)(10)     Amendment No. 1 to Collaboration Research Agreement between the
                                             Registrant and Kyowa Hakko Kogyo Co., Ltd., dated May 9, 1994.
                      ++    10.20(ii)(10)    Amendment No. 2 to Collaboration Research Agreement between the
                                             Registrant and Kyowa Hakko Kogyo Co., Ltd., dated July 13, 1995.
                      ++    10.20(iii)(10)   Amendment No. 3 to Collaboration Research Agreement between the
                                             Registrant and Kyowa Hakko Kogyo Co., Ltd., dated August 1, 1995.
                      ++    10.20(iv)(10)    Amendment No. 5 to Collaboration Research Agreement between the
                                             Registrant and Kyowa Hakko Kogyo Co., Ltd., dated December 17, 1996.
                            10.21(10)        Description of Registrant's 1996 Incentive Pay Plan.
                      ++    10.22(11)        Long Term Supply Agreement between Registrant and Solvay, Societe
                                             Anonyme, dated September 28, 1995.
                      ++    10.23(11)        Amendment No. 1 to the Long Term Supply Agreement between Registrant
                                             and Solvay, Societe Anonyme, as amended, dated April 1, 1997.
                      ++    10.24(11)        License and Supply Agreement between the Registrant and Solvay,
                                             Societe Anonyme, dated July 27, 1994.
                      ++    10.25(11)        First Amendment to the License and Supply Agreement between
                                             Registrant and Solvay, Societe Anonyme, as amended, dated March 13,
                                             1995.
                      ++    10.26(11)        Second Amendment to the License and Supply Agreement between
                                             Registrant and Solvay, Societe Anonyme, as amended, dated June 1,
                                             1995.
                      ++    10.27(11)        Third Amendment to the License and Supply Agreement between
                                             Registrant and Solvay, Societe Anonyme, as amended, dated September
                                             5, 1995.
                      ++    10.28(11)        Letter Amendment to the License and Supply Agreement between
                                             Registrant and Solvay, Societe Anonyme, as amended, dated June 6,
                                             1996.
                      ++    10.29(11)        Fourth Amendment to the License and Supply Agreement between
                                             Registrant and Solvay, Societe Anonyme, as amended, dated April 1,
                                             1997.
</TABLE>


<PAGE>   52

<TABLE>
<CAPTION>
                             Number          Exhibit
                           -----------       -----------------------------------------------------------------------
<S>                                          <C>                                                                
                            10.31            1998 Non-Officer Equity Incentive Plan.

                            10.32            Form of Option Agreements used for the 1998 Non-Officer Equity
                                             Incentive Plan
                       +    10.33            Amendment to Collaboration Agreement, dated December 23, 1998,
                                             between Schering-Plough Ltd. and Schering Corporation and the
                                             Registrant.
                             23.1            Consent of Ernst & Young LLP, Independent Auditors.
                             24.1            Power of Attorney, Reference is made to the signature page.
                             27.1            Financial Data Schedule.
</TABLE>


*        Indicates management contracts or compensatory plans
         or arrangements filed pursuant to Item 601(b)(10) of
         Regulation S-K.

+        Confidential treatment requested.

++       Confidential treatment granted.

(1)      Filed as an exhibit to the Registrant's Registration Statement on 
         Form S-8 (Reg. No. 33-42912) and incorporated herein by reference.

(2)      Filed as an exhibit to the Registrant's Registration Statement on 
         Form S-1 (Reg. No. 33-40627) or amendments thereto and incorporated 
         herein by reference.

(3)      Filed as an exhibit to the Registrant's Registration Statement on 
         Form S-1 (Reg. No. 33-43181) or amendments thereto and incorporated
         herein by reference.

(4)      Filed as an exhibit to the Registrant's Annual Report
         on Form 10-K for the period ended December 31, 1992
         and incorporated by reference herein.

(5)      Filed as an exhibit to the Registrant's Quarterly
         Report on Form 10-Q for the period ended June 30,
         1993 and incorporated by reference herein.

(6)      Filed as an exhibit to the Registrant's Annual Report
         on Form 10-K for the period ended December 31, 1993
         and incorporated by reference herein.

(7)      Filed as an exhibit to the Registrant's Annual Report
         on Form 10-K for the period ended December 31, 1994
         and incorporated by reference herein.

(8)      Filed as an exhibit to the Registrant's Quarterly
         Report on Form 10-Q for the period ended June 30,
         1995 and incorporated by reference herein.

(9)      Filed as an exhibit to the Registrant's Annual Report
         on Form 10-K for the period ended December 31, 1995
         and incorporated by reference herein.

(10)     Filed as an exhibit to the Registrant's Annual Report
         on Form 10-K for the period ended December 31, 1996
         and incorporated by reference herein.

(11)     Filed as an exhibit to the Registrant's Quarterly
         Report on Form 10-Q for the period ended September
         30, 1998 and incorporated by reference herein.



<PAGE>   1
                                                                   EXHIBIT 10.31


NOTICE OF GRANT OF STOCK OPTIONS                      COR THERAPEUTICS, INC.
AND OPTION AGREEMENT                                  ID: 94-3060271
                                                      256 E. Grand Avenue
                                                      S. San Francisco, CA 94080

- --------------------------------------------------------------------------------
                                    Option Number: [option #]
                                    Plan: 1998 Non-officer Equity Incentive Plan
[Name & Address]                    ID: [ID #]                         
                                                      
- --------------------------------------------------------------------------------

Effective [date], you have been granted a(n) Non-Qualified Stock Option to buy
[shares] of COR Therapeutics, Inc. (the Company) stock at [price] per share.

The total option price of the shares granted is [price x shares.]

Shares in each period will become fully vested on the date shown.

<TABLE>
<CAPTION>
       Shares          Vest Type         Full Vest         Expiration
       ------          ---------         ---------         ----------
       <S>             <C>               <C>               <C>



</TABLE>

- --------------------------------------------------------------------------------

By your signature and the Company's signature below, you and the Company agree
that these options are granted under and governed by the terms and conditions 
of the Company's Stock Option Plan as amended and the Option Agreement, all of 
which are attached and made a part of this document.

- --------------------------------------------------------------------------------




- ---------------------------------              ---------------------------------
COR Therapeutics, Inc.                         Date



- ---------------------------------              ---------------------------------
[Name]                                         Date

<PAGE>   1
                                                                   EXHIBIT 10.32


                             COR THERAPEUTICS, INC.
                     1998 NON-OFFICER EQUITY INCENTIVE PLAN

                            ADOPTED FEBRUARY 27, 1998
                        STOCKHOLDER APPROVAL NOT REQUIRED
                             TERMINATION DATE: NONE

1.    PURPOSES.

      (a)   The purpose of the Plan is to provide a means by which selected
Employees and Consultants may be given an opportunity to benefit from increases
in value of the common stock of the Company ("Common Stock") through the
granting of (i) Nonstatutory Stock Options, (ii) stock bonuses and (iii) rights
to purchase restricted stock.

      (b)   The Company, by means of the Plan, seeks to retain the services of
persons who are now Employees or Consultants, to secure and retain the services
of new Employees and Consultants and to provide incentives for such persons to
exert maximum efforts for the success of the Company and its Affiliates.

      (c)   The Company intends that the Stock Awards issued under the Plan
shall, in the discretion of the Board, be either (i) Nonstatutory Stock Options
granted pursuant to Section 6 hereof or (ii) stock bonuses or rights to purchase
restricted stock granted pursuant to Section 7 hereof. All Options shall be in
such form as issued pursuant to Section 6.

2.    DEFINITIONS.

      (a)   "AFFILIATE" means any parent corporation or subsidiary corporation,
whether now or hereafter existing, as those terms are defined in Sections 424(e)
and (f) respectively, of the Code, or such other parent corporation or
subsidiary corporation designated by the Board.

      (b)   "BOARD" means the Board of Directors of the Company.

      (c)   "CODE" means the Internal Revenue Code of 1986, as amended.

      (d)   "COMMITTEE" means a committee appointed by the Board in accordance
with subsection 3(c) of the Plan.

      (e)   "COMPANY" means COR Therapeutics, Inc., a Delaware corporation.

      (f)   "CONSULTANT" means any person, including an advisor, engaged by the
Company or an Affiliate to render consulting services and who is compensated for
such services, provided that the term "Consultant" shall not include a Director.

      (g)   "CONTINUOUS SERVICE" means that the Participant's service with the
Company or an Affiliate is not interrupted or terminated. The Participant's
Continuous Service shall not be deemed to have terminated merely because of a
change in the capacity in which the Participant renders service to the Company
or an Affiliate, whether as an Employee, Consultant, Director or 


                                                                    Page 1 of 11
<PAGE>   2
member of the Board of Directors of an Affiliate, provided that there is no
interruption or termination of the Participant's service. Nor shall the
Participant's Continuous Service be deemed to have terminated merely because of
a change in the entity for which the Participant renders such service, provided
that there is no interruption or termination of the Participant's service. For
example, a change in status from an Employee of the Company to a member of the
Board of Directors of an Affiliate will not constitute an interruption of
Continuous Service. The Board or the chief executive officer of the Company, in
that party's sole discretion, may determine whether Continuous Service shall be
considered interrupted in the case of any leave of absence approved by that
party, including sick leave, military leave or any other personal leave.

      (h)   "DIRECTOR" means a member of the Board.

      (i)   "DISABILITY" means total and permanent disability as defined in
Section 22(e) of the Code.

      (j)   "EMPLOYEE" means any person employed by the Company or any Affiliate
of the Company. Neither service as a Director nor payment of a director's fee by
the Company shall be sufficient to constitute "employment" by the Company.

      (k)   "EXCHANGE ACT" means the Securities Exchange Act of 1934, as
amended.

      (l)   "FAIR MARKET VALUE" means, as of any date, the value of the Common
Stock of the Company determined as follows:

            (1)   If the Common Stock is listed on any established stock
exchange or traded on the Nasdaq National Market System or the Nasdaq SmallCap
Market, the Fair Market Value of a share of Common Stock shall be the average of
the high and low sales prices for such stock as quoted on such exchange or
market (or the exchange or market with the greatest volume of trading in the
Common Stock) on the last market trading day prior to the day of determination,
as reported in The Wall Street Journal or such other source as the Board deems
reliable.

            (2)   In the absence of such markets for the Common Stock, the Fair
Market Value shall be determined in good faith by the Board.

      (m)   "NONSTATUTORY STOCK OPTION" means an Option not intended to qualify
as an incentive stock option pursuant to Section 422 of the Code and the
regulations promulgated thereunder.

      (n)   "OFFICER" means a person who is an officer of the Company within the
meaning of Section 16 of the Exchange Act and the rules and regulations
promulgated thereunder.

      (o)   "OPTION" means a Nonstatutory Stock Option granted pursuant to the
Plan.

      (p)   "OPTION AGREEMENT" means a written agreement between the Company and
an Optionee evidencing the terms and conditions of an individual Option grant.
Each Option Agreement shall be subject to the terms and conditions of the Plan.


                                                                    Page 2 of 11
<PAGE>   3
      (q)   "OPTIONEE" means a person to whom an Option is granted pursuant to
the Plan.

      (r)   "PARTICIPANT" means a person to whom a Stock Award is granted
pursuant to the Plan or, if applicable, such other person who holds an
outstanding Stock Award.

      (s)   "PLAN" means this COR Therapeutics, Inc. 1998 Non-Officer Equity
Incentive Plan.

      (t)   "SHARE" means a share of Common Stock of the Company.

      (u)   "STOCK AWARD" means any right granted under the Plan, including any
Option, any stock bonus and any right to purchase restricted stock.

      (v)   "SECURITIES ACT" means the Securities Act of 1933, as amended.

      (w)   "STOCK AWARD AGREEMENT" means an Option Agreement or other written
agreement between the Company and a holder of a Stock Award evidencing the terms
and conditions of an individual Stock Award grant. Each Stock Award Agreement
shall be subject to the terms and conditions of the Plan.

3.    ADMINISTRATION.

      (a)   The Board shall administer the Plan unless and until the Board
delegates administration to a Committee, as provided in subsection 3(c).

      (b)   The Board shall have the power, subject to, and within the
limitations of, the express provisions of the Plan:

            (1)   To determine from time to time which of the persons eligible
under the Plan shall be granted Stock Awards; when and how each Stock Award
shall be granted; whether a Stock Award will be an Option, a stock bonus, a
right to purchase restricted stock or a combination of the foregoing; the
provisions of each Stock Award granted (which need not be identical), including
the time or times when a person shall be permitted to receive Shares pursuant to
a Stock Award and the number of Shares with respect to which a Stock Award shall
be granted to each such person.

            (2)   To construe and interpret the Plan and Stock Awards granted
under it, and to establish, amend and revoke rules and regulations for its
administration. The Board, in the exercise of this power, may correct any
defect, omission or inconsistency in the Plan or in any Stock Award Agreement,
in a manner and to the extent it shall deem necessary or expedient to make the
Plan fully effective.

            (3)   To amend the Plan or a Stock Award as provided in Section 13.


                                                                    Page 3 of 11
<PAGE>   4
            (4)   Generally, to exercise such powers and to perform such acts as
the Board deems necessary or expedient to promote the best interests of the
Company which are not in conflict with the provisions of the Plan.

      (c)   The Board may delegate administration of the Plan to a committee or
committees ("Committee") of one or more members of the Board. If administration
is delegated to a Committee, the Committee shall have, in connection with the
administration of the Plan, the powers theretofore possessed by the Board (and
references in this Plan to the Board shall thereafter be to the Committee),
subject, however, to such resolutions, not inconsistent with the provisions of
the Plan, as may be adopted from time to time by the Board. The Board may
abolish the Committee at any time and revest in the Board the administration of
the Plan.

4.    SHARES SUBJECT TO THE PLAN.

      (a)   Subject to the provisions of Section 12 relating to adjustments upon
changes in the Common Stock, the Shares that may be issued pursuant to Stock
Awards shall not exceed in the aggregate Three Hundred Thousand (300,000)
Shares. If any Stock Award shall for any reason expire or otherwise terminate,
in whole or in part, without having been exercised in full (or vested in the
case of restricted stock), the Shares not acquired under such Stock Award shall
revert to and again become available for issuance under the Plan.

      (b)   The Shares subject to the Plan may be unissued Shares or reacquired
Shares bought on the market or otherwise.

5.    ELIGIBILITY.

Stock Awards may be granted only to Employees or Consultants who are not, at the
time of such grants, (i) Directors or (ii) Officers.

6.    OPTION PROVISIONS.

      Each Option shall be in such form and shall contain such terms and
conditions as the Board shall deem appropriate. The provisions of separate
Options need not be identical, but each Option shall include (through
incorporation of provisions hereof by reference in the Option or otherwise) the
substance of each of the following provisions:

      (a)   TERM. No Option shall be exercisable after the expiration of ten
(10) years from the date of grant, or such longer or shorter term as may be
provided in the Option Agreement.

      (b)   PRICE. The exercise price of each Option shall be as determined by
the Board and shall be set forth in the Option Agreement; provided, however,
that in no event shall the exercise price be less than one hundred percent
(100%) of the Fair Market Value on the date of grant.

      (c)   CONSIDERATION. The consideration to be paid for the Shares to be
issued upon exercise of an Option, including the method of payment, shall be
determined by the Board and may consist entirely of (i) cash or check, (ii)
promissory note (except that payment of the Share's "par value," as defined in
the Delaware General Corporation Law, shall not be made by deferred payment),
(iii) other Shares having a fair market value on the date of surrender equal to
the 


                                                                    Page 4 of 11
<PAGE>   5
aggregate exercise price of the Shares as to which the Option shall be
exercised, including by delivering to the Company an attestation of ownership of
owned and unencumbered Shares in a form approved by the Company, (iv) payment
pursuant to a program developed under Regulation T as promulgated by the Federal
Reserve Board which, prior to the issuance of the Shares, results in either the
receipt of cash (or check) by the Company or the receipt of irrevocable
instructions to pay the aggregate exercise price to the Company from the sales
proceeds, (v) any combination of such methods of payment or (vi) such other
consideration and method of payment for the issuance of Shares to the extent
permitted under applicable law. In making its determination as to the type of
consideration to accept, the Board shall consider if acceptance of such
consideration may be reasonably expected to benefit the Company. In the case of
any deferred payment arrangement, interest shall be compounded at least annually
and shall be charged at not less than the minimum rate of interest necessary to
avoid the treatment as interest, under any applicable provisions of the Code, of
any amounts other than amounts stated to be interest under the deferred payment
arrangement

      (d)   TRANSFERABILITY. An Option may be transferred to the extent provided
in the Option Agreement; provided, however, that if the Option Agreement does
not specifically provide for transferability, the Option shall not be
transferable except by will or by the laws of descent and distribution or
pursuant to a domestic relations order. Notwithstanding the foregoing, the
Optionee may, by delivering written notice to the Company, in a form
satisfactory to the Company, designate a third party who, in the event of the
death of the Optionee, shall thereafter be entitled to exercise the Option.

      (e)   VESTING. The total number of Shares subject to an Option may, but
need not, be allotted in periodic installments (which may, but need not, be
equal). The Option Agreement may provide that from time to time during each of
such installment periods, the Option may become exercisable ("vest") with
respect to some or all of the Shares allotted to that period, and may be
exercised with respect to some or all of the Shares allotted to such period
and/or any prior period as to which the Option became vested but was not fully
exercised. The Option may be subject to such other terms and conditions on the
time or times when it may be exercised (which may be based on performance or
other criteria) as the Board may deem appropriate. The vesting provisions of
individual Options may vary. The provisions of this subsection 6(e) are subject
to any Option provisions governing the minimum number of Shares as to which an
Option may be exercised.

      (f)   TERMINATION OF SERVICE RELATIONSHIP. In the event an Optionee's
Continuous Service terminates (other than upon the Optionee's death or
Disability), the Optionee may, but only within three (3) months (or such longer
or shorter period specified in the Option Agreement) after the date of such
termination, exercise his or her Option, which shall in no event be later than
the expiration of the term of the Option as set forth in the Option Agreement
(the "Post-Termination Exercise Period") and only to the extent that the
Optionee was entitled to exercise the Option on the date the Optionee's
Continuous Service terminates. The Board may at any time extend the
Post-Termination Exercise Period and provide for continued vesting during such
extended period. If, as of the date of termination, the Optionee is not entitled
to exercise his or her entire Option, the Shares covered by the unexercisable
portion of the Option shall revert to the Plan. If, after termination, the
Optionee does not exercise his or her Option within the time specified in the
Option Agreement or as otherwise determined above, the Option shall terminate,


                                                                    Page 5 of 11
<PAGE>   6
and the Shares covered by such Option shall revert to the Plan. Notwithstanding
the foregoing, the Board shall have the power to permit an Option to vest, in
whole or in part, during the Post-Termination Exercise Period.

      An Optionee's Option Agreement may also provide that if the exercise of
the Option following the termination of the Optionee's Continuous Service (other
than upon the Optionee's death or disability) would be prohibited at any time
solely because the issuance of Shares would violate the registration
requirements under the Securities Act, then the Option shall terminate on the
earlier of (i) the expiration of the term of the Option set forth in the first
paragraph of this subsection 6 (f), or (ii) the expiration of a period of three
(3) months after the termination of the Optionee's Continuous Service during
which the exercise of the Option would not be in violation of such registration
requirements.

      (g)   DISABILITY OF OPTIONEE. In the event an Optionee's Continuous
Service terminates as a result of the Optionee's Disability, the Optionee may
exercise his or her Option (to the extent that the Optionee was entitled to
exercise it as of the date of termination), but only within such period of time
ending on the earlier of (i) the date twelve (12) months (or such longer or
shorter period specified in the Option Agreement) following such termination or
(ii) the expiration of the term of the Option as set forth in the Option
Agreement. If, at the date of termination, the Optionee is not entitled to
exercise his or her entire Option, the Shares covered by the unexercisable
portion of the Option shall revert to and again become available for issuance
under the Plan. If, after termination, the Optionee does not exercise his or her
Option within the time specified herein, the Option shall terminate, and the
Shares covered by such Option shall revert to and again become available for
issuance under the Plan.

      (h)   DEATH OF OPTIONEE. In the event of the death of an Optionee during
Optionee's Continuous Service, the Option may be exercised (to the extent the
Optionee was entitled to exercise the Option as of the date of death) by the
Optionee's estate, by a person who acquired the right to exercise the Option by
bequest or inheritance, but only within the period ending on the earlier of (i)
the date eighteen (18) months (or such longer or shorter period specified in the
Option Agreement) following the date of death or (ii) the expiration of the term
of such Option as set forth in the Option Agreement. If, at the time of death,
the Optionee was not entitled to exercise his or her entire Option, the Shares
covered by the unexercisable portion of the Option shall revert to and again
become available for issuance under the Plan. If, after death, the Option is not
exercised within the time specified herein, the Option shall terminate, and the
Shares covered by such Option shall revert to and again become available for
issuance under the Plan.

      (i)   EARLY EXERCISE. The Option may, but need not, include a provision
whereby the Optionee may elect at any time while before the Optionee's
Continuous Service terminates to exercise the Option as to any part or all of
the Shares subject to the Option prior to the full vesting of the Option. Any
unvested Shares so purchased may be subject to a repurchase right in favor of
the Company or to any other restriction the Board determines to be appropriate.


                                                                    Page 6 of 11
<PAGE>   7
7.    TERMS OF STOCK BONUSES AND PURCHASES OF RESTRICTED STOCK.

      Each stock bonus or restricted stock purchase agreement shall be in such
form and shall contain such terms and conditions as the Board shall deem
appropriate. The terms and conditions of stock bonus or restricted stock
purchase agreements may change from time to time, and the terms and conditions
of separate agreements need not be identical, but each stock bonus or restricted
stock purchase agreement shall include (through incorporation of provisions
hereof by reference in the agreement or otherwise) the substance of each of the
following provisions as appropriate:

      (a)   PURCHASE PRICE. The purchase price under each restricted stock
purchase agreement shall be such amount as the Board shall determine and
designate in such agreement. Notwithstanding the foregoing, the Board may
determine that eligible participants in the Plan may be awarded stock pursuant
to a stock bonus agreement in consideration for past services actually rendered
to the Company or for its benefit.

      (b)   TRANSFERABILITY. No rights under a stock bonus or restricted stock
purchase agreement shall be transferable except by will or the laws of descent
and distribution so long as stock awarded under such agreement remains subject
to the terms of any restrictive covenant (such as a repurchase option or
reacquisition option) in favor of the Company.

      (c)   CONSIDERATION. The purchase price of Shares acquired pursuant to a
stock purchase agreement shall be paid either: (i) in cash at the time of
purchase, (ii) at the discretion of the Board, according to a deferred payment
or other arrangement with the Optionee, except that payment of the common
stock's "par value" (as defined in the Delaware General Corporation Law) shall
not be made by deferred payment, or (iii) in any other form of legal
consideration that may be acceptable to the Board in its discretion.
Notwithstanding the foregoing, the Board to which administration of the Plan has
been delegated may award stock pursuant to a stock bonus agreement in
consideration for past services actually rendered to the Company or for its
benefit.

      (d)   VESTING. Shares sold or awarded under the Plan may, but need not, be
subject to a repurchase option or reacquisition option in favor of the Company
in accordance with a vesting schedule to be determined by the Board.

      (e)   TERMINATION OF CONTINUOUS SERVICE. In the event a Participant's
Continuous Service terminates, the Company may repurchase or otherwise reacquire
any or all of the Shares held by the Participant which have not vested as of the
date of termination under the terms of the stock bonus or restricted stock
purchase agreement between the Company and the Participant.

8.    CANCELLATION AND RE-GRANT OF OPTIONS.

The Board or the Committee shall have the authority to effect, at any time and
from time to time, with the consent of the affected holders of Options, (i) the
repricing of any outstanding Options under the Plan and/or (ii) the cancellation
of any outstanding Options and the grant in substitution therefor of new Options
under the Plan covering the same or different numbers of 


                                                                    Page 7 of 11
<PAGE>   8
shares of Common Stock, but having an exercise price per share not less than one
hundred percent (100%) of the fair market value.


9.    COVENANTS OF THE COMPANY.

      (a)   During the terms of the Stock Awards, the Company shall keep
available at all times the number of Shares required to satisfy such Stock
Awards.

      (b)   The Company shall seek to obtain from each regulatory commission or
agency having jurisdiction over the Plan such authority as may be required to
issue and sell Shares under Stock Awards; provided, however, that this
undertaking shall not require the Company to register under the Securities Act
either the Plan, any Stock Award or any Shares issued or issuable pursuant to
any such Stock Award. If, after reasonable efforts, the Company is unable to
obtain from any such regulatory commission or agency the authority which counsel
for the Company deems necessary for the lawful issuance and sale of Shares under
the Plan, the Company shall be relieved from any liability for failure to issue
and sell Shares upon exercise of such Stock Awards unless and until such
authority is obtained.

10.   USE OF PROCEEDS FROM SHARES.

      Proceeds from the sale of Shares pursuant to Stock Awards shall constitute
general funds of the Company.


11.   MISCELLANEOUS.

      (a)   The Board shall have the power to accelerate the time at which all
or any part of a Stock Award may first be exercised or the time during which a
Stock Award or any part thereof will vest, notwithstanding the provisions in the
Stock Award stating the time at which it may first be exercised or the time
during which it will vest.

      (b)   No Participant shall be deemed to be the holder of, or to have any
of the rights of a holder with respect to, any Shares subject to a Stock Award
unless and until the Participant has satisfied all requirements for the exercise
of the Stock Award pursuant to its terms.

      (c)   Nothing in the Plan or any instrument executed or Stock Award
granted pursuant thereto shall confer upon any Participant any right to continue
in the employ of the Company or any Affiliate or to continue serving as a
Consultant or shall affect the right of the Company or any Affiliate to
terminate the employment or consulting relationship with or without notice and
with or without cause.

      (d)   The Company may require a Participant, as a condition of exercising
or acquiring Shares under any Stock Award, (i) to give written assurances
satisfactory to the Company as to such person's knowledge and experience in
financial and business matters and/or to employ a purchaser representative
reasonably satisfactory to the Company who is knowledgeable and experienced in
financial and business matters, and that he or she is capable of evaluating,
alone or together with the purchaser representative, the merits and risks
associated with the Stock 


                                                                    Page 8 of 11
<PAGE>   9
Award, and (ii) to give written assurances satisfactory to the Company stating
that such person is acquiring the Shares subject to the Stock Award for such
person's own account and not with any present intention of selling or otherwise
distributing the Shares. The foregoing requirements, and any assurances given
pursuant to such requirements, shall be inoperative if (i) the issuance of the
Shares upon the exercise or acquisition of Shares under the Stock Award has been
registered under a then currently effective registration statement under the
Securities Act, or (ii) as to any particular requirement, a determination is
made by counsel for the Company that such requirement need not be met in the
circumstances under the then applicable securities laws. The Company may, upon
advice of counsel to the Company, place legends on stock certificates issued
under the Plan as such counsel deems necessary or appropriate in order to comply
with applicable securities laws, including, but not limited to, legends
restricting the transfer of the Shares.

      (e)   To the extent provided by the terms of a Stock Award Agreement, the
Participant may satisfy any federal, state or local tax withholding obligation
relating to the exercise or acquisition of Shares under a Stock Award by any of
the following means or by a combination of such means: (i) tendering a cash
payment, (ii) authorizing the Company to withhold Shares from the Shares
otherwise issuable to the participant as a result of the exercise or acquisition
of Shares under the Stock Award or (iii) delivering to the Company owned and
unencumbered Shares, including by delivering to the Company an attestation of
ownership of owned and unencumbered Shares in a form approved by the Company.

12.   ADJUSTMENTS UPON CHANGES IN STOCK.

      (a)   If any change is made in the Shares subject to the Plan, or subject
to any Stock Award, without the receipt of consideration by the Company (through
merger, consolidation, reorganization, recapitalization, reincorporation, stock
dividend, dividend in property other than cash, stock split, liquidating
dividend, combination of Shares, exchange of Shares, change in corporate
structure or other transaction not involving the receipt of consideration by the
Company), the Plan will be appropriately adjusted in the class(es) and maximum
number of Shares subject to the Plan pursuant to subsection 4(a), and the
outstanding Stock Awards will be appropriately adjusted in the class(es) and
number of Shares and price per Share subject to such outstanding Stock Awards.
Such adjustments shall be made by the Board, the determination of which shall be
final, binding and conclusive. (The conversion of any convertible securities of
the Company shall not be treated as a "transaction not involving the receipt of
consideration by the Company.")

      (b)   Notwithstanding anything to the contrary in this Plan, in the event
of a Change of Control (as hereinafter defined), then, at the sole discretion of
the Board and to the extent permitted by applicable law: (i) any surviving
corporation shall assume the rights and obligations of the Company under any
Stock Awards outstanding under the Plan or shall substitute similar Stock Awards
for those outstanding under the Plan; (ii) the time during which such Stock
Awards become vested or may be exercised shall be accelerated and any
outstanding unexercised rights under any Stock Awards terminated if not
exercised prior to such event; or (iii) such Stock Awards shall continue in full
force and effect.


                                                                    Page 9 of 11
<PAGE>   10
      (c)   For purposes of the Plan, a "Change of Control" shall be deemed to
have occurred at any of the following times:

            (1)   Upon the acquisition (other than from the Company) by any
person, entity or "group," within the meaning of Section 13(d)(3) or 14(d)(2) of
the Exchange Act (excluding, for this purpose, the Company or its affiliates, or
any employee benefit plan of the Company or its affiliates which acquires
beneficial ownership of voting securities of the Company), of beneficial
ownership (within the meaning of Rule 13d-3 promulgated under the Exchange Act)
of fifty percent (50%) or more of either the then outstanding shares of common
stock or the combined voting power of the Company's then outstanding voting
securities entitled to vote generally in the election of directors; or

            (2)   At the time individuals who, as of January 1998, constitute
the Board (the "Incumbent Board") cease for any reason to constitute at least a
majority of the Board, provided that any person becoming a director subsequent
to January 1998, whose election, or nomination for election by the Company's
stockholders, was approved by a vote of at least a majority of the directors
then comprising the Incumbent Board (other than an election or nomination of an
individual whose initial assumption of office is in connection with an actual or
threatened election contest relating to the election of the directors of the
Company, as such terms are used in Rule 14a-11 of Regulation 14A promulgated
under the Exchange Act) shall be, for purposes of the Plan, considered as though
such person were a member of the Incumbent Board; or

            (3)   Immediately prior to the consummation by the Company of a
reorganization, merger, consolidation, (in each case, with respect to which
persons who were the stockholders of the Company immediately prior to such
reorganization, merger or consolidation do not, immediately thereafter, own more
than fifty percent (50%) of the combined voting power entitled to vote generally
in the election of directors of the reorganized, merged or consolidated
company's then outstanding voting securities) or a liquidation or dissolution of
the Company or of the sale of all or substantially all of the assets of the
Company; or

            (4)   The occurrence of any other event that the Incumbent Board in
its sole discretion determines constitutes a Change of Control.

13.   AMENDMENT OF THE PLAN AND STOCK AWARDS.

      (a)   The Board at any time, and from time to time, may amend the Plan.

      (b)   The Board, in its sole discretion, may submit the Plan and/or any
amendment to the Plan for stockholder approval.

      (c)   Rights and obligations under any Stock Award granted before
amendment of the Plan shall not be impaired by any such amendment unless (i) the
Company requests the consent of the Participant and (ii) the Participant
consents in writing.


                                                                   Page 10 of 11
<PAGE>   11
      (d)   The Board at any time may amend the terms of any one or more Stock
Awards; provided, however, that the rights and obligations under any Stock Award
shall not be impaired by any such amendment unless (i) the Company requests the
consent of the Participant and (ii) the Participant consents in writing.

14.   TERMINATION OR SUSPENSION OF THE PLAN.

      (a)   The Board may suspend or terminate the Plan at any time. Unless
sooner terminated, the Plan shall terminate when all Shares reserved for
issuance under the Plan have been issued and all such issued Shares are no
longer subject to a repurchase option or a reacquisition option in favor of the
Company. No Stock Awards may be granted under the Plan while the Plan is
suspended or after it is terminated.

      (b)   Rights and obligations under any Stock Award granted while the Plan
is in effect shall not be impaired by suspension or termination of the Plan,
except with the written consent of the Participant.

15.   EFFECTIVE DATE OF PLAN.

      The Plan shall become effective on February 27, 1998.


                                                                   Page 11 of 11

<PAGE>   1
CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.


                                                                   EXHIBIT 10.33


                      AMENDMENT TO COLLABORATION AGREEMENT
                                      AMONG
                             COR THERAPEUTICS, INC.,
                              SCHERING CORPORATION
                                       AND
                              SCHERING-PLOUGH, LTD.
                              DATED APRIL 10, 1995



        THIS AMENDMENT ("Amendment") effective as of the last date set forth
below (the "Amendment Effective Date"), to the Collaboration Agreement by and
among COR THERAPEUTICS, INC., a Delaware corporation ("COR"), SCHERING
CORPORATION, a New Jersey corporation ("Schering") and SCHERING-PLOUGH, LTD., a
corporation organized under the laws of Switzerland ("Schering Ltd.") dated
April 10, 1995 (the "Agreement") is entered into by and between the parties
hereto with reference to the facts below. Schering and Schering Ltd. are
referred to herein collectively as "Schering". Terms with initial capitals,
which are not specifically defined in this Amendment, shall have the defined
meaning set forth in the Agreement.

        WHEREAS, Section 4.1(a) of the Agreement grants the right to COR to
Co-Promote with Schering, on a country-by-country basis, in each country in the
Co-Promotion Territory each Co-Developed Product following Regulatory Approval,
subject to the time periods set forth in Section 4.1(a) and the sales effort
requirements and limitations set forth in Section 5.5(a);

        WHEREAS, Section 9.7 of the Agreement provides for certain payments of
royalties to COR from Schering based on Royalty-Bearing Sales of Integrelin
Products in the Co-Promotion Territory;

        WHEREAS, Section 9.4 of the Agreement provides for reporting of Net
Sales and Allowable Expenses incurred by each Party for all Co-Promoted Products
during a calendar quarter. In addition, within 45 days after the end of each
calendar quarter, the Party booking sales is required to pay to the other Party
such other Party's Allowable Expenses incurred during such quarter;

        WHEREAS, Section 7.5 of the Agreement provides in part that Schering
shall advance specified percentages of the invoiced amounts payable by COR to
Third Parties for the manufacture of bulk Integrelin and finished Integrelin
Product; and

        WHEREAS, the Parties wish to amend the Agreement to extend the Schering
exclusivity period set forth in Section 4.1(a), to modify COR's Sales Efforts
set forth in Section 5.5(a), to modify the royalties set forth in Section 9.7
relating to the Co-Promotion Territory, to modify the time period set forth in
Section 9.4 within which to pay for Allowable Expenses, to modify the


                    [*] =  Confidential Treatment Requested

                                       1.
<PAGE>   2
CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

amount Schering is required to advance to COR for the manufacture of bulk and
finished Integrelin Product and to amend certain other provisions in the
Agreement in order to achieve consistency with the objectives of this Amendment;

        WHEREAS, Section 18.1 provides for amendment, change or addition to the
Agreement if reduced to writing and signed by an authorized officer of each
Party.

        NOW, THEREFORE, in consideration of the foregoing premises and the
mutual covenants and obligations below, the Parties agree as follows:

I.      EXTENSION OF EXCLUSIVITY PERIOD

        The Parties agree that Section 4.1(a) shall be amended by deleting it in
its entirety and replacing Section 4.1(a) with the following:

               "Subject to the terms and conditions of this Agreement, COR will
        have the right to Co-Promote with Schering, on a country-by-country
        basis, in each country in the Co-Promotion Territory each Co-Developed
        Product following Regulatory Approval, provided, however, that COR's
        right to Co-Promote each Co-Developed Product in any country of Europe
        shall commence, on a country-by-country basis, on the [*] of Schering's
        commercial launch of the first Integrelin Product in such country."

II.     MODIFICATION OF SALES REPRESENTATIVES' EFFORTS

        The parties agree that Section 5.5(a)(ii) shall be amended to delete the
first sentence of the subsection in its entirety and replace it with the
following:

               "(ii) COR's contribution of Sales Representative Efforts in each
        country of Europe shall be limited to [*] of the total level of Sales
        Representative Efforts in that country in the first year of Co-Promotion
        in the applicable country (as provided in Section 4.1(a)) and Schering's
        contribution of Sales Representative Efforts in such country during such
        year shall be at least [*] of the total; COR's contribution of Sales
        Representative Efforts in each country of Europe shall be limited to [*]
        of the total level of Sales Representative Efforts in that country in
        the second year of Co-Promotion in the applicable country and in
        subsequent years, and Schering's contribution of Sales Representative
        Efforts in such country during such year and in subsequent years shall
        be at least [*] of the total"

        The remainder of Section 5.5(a)(ii) shall remain unchanged.

        In addition, the Parties agree that the last sentence of Section 5.5(a)
shall be deleted in its entirety.

III.    ROYALTIES

        The Parties agree that Section 9.7 shall be amended to add the following
two sentences immediately after the table setting forth the dollar amounts and
royalty rate:


                    [*] =  Confidential Treatment Requested

                                       2.
<PAGE>   3
CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

               "provided, however, that the royalty rate shall be [*] in the
        Co-Promotion Territory (except for [*]) until the end of the exclusivity
        period set forth in Section 4.1(a). Following the termination of the
        exclusivity period provided for in Section 4.1(a), the royalties in the
        Co-Promotion Territory (except for [*]) shall be increased to [*] except
        in countries where COR is Co-Promoting the Integrelin Product, in which
        case COR shall be compensated under Section 9.2."

        The remainder of Section 9.7 shall remain unchanged.

IV.     RECEIVABLES MANAGEMENT

        The Parties agree that Section 9.4(a) shall be amended by deleting it in
its entirety and replacing Section 9.4(a) with the following:

               "Within 30 days after the end of each calendar quarter, each
        Party shall report to the other Party with regard to Net Sales and
        Allowable Expenses incurred by such Party for all Co-Promoted Products
        during such quarter. Except as provided in paragraph (b) below, no later
        than [*] prior to the end of each calendar quarter, the Party booking
        sales shall, on an [*], pay to the other Party [*] of the total amount
        of such other Party's Allowable Expenses incurred during such quarter
        and its share of Sales Allocation and Co-Development Allocation for such
        quarter for all such Co-Promoted Products, all in the relevant countries
        in the Co-Promotion Territory, pursuant to the following procedure: (1)
        Each Party incurring the Allowable Expenses shall submit to the other
        Party, by the [*] of the [*] of each calendar quarter, [*] allowable
        Expenses incurred for [*] and the [*] Allowable Expenses for the [*] of
        the applicable calendar quarter (e.g., For the calendar quarter ending
        [*], each Party shall submit to the other Party, no later than [*]
        Allowable Expenses through [*], respectively, and an [*] Allowable
        Expenses through [*]); (2) Each Party would review the other Party's
        submission and the Party recording sales shall pay to the other Party
        [*] amount of such Party's submitted Allowable Expenses and its [*] of
        Sales Allocation and Co-Development Allocation for such quarter no later
        than [*] (e.g. When the incurring Party makes its submissions no later
        than [*], the Party recording sales shall pay the incurring Party no
        later than [*]); (3) Each Party shall submit to the other Party [*]
        Allowable Expenses for the applicable calendar quarter no later than the
        end of the [*] following such quarter (e.g., [*] Allowable Expenses for
        the quarter ending [*] to be submitted no later than [*]); (4) The
        Parties shall [*] for the previous quarter no later than the [*] month
        of the [*] (e.g., [*] of the calendar quarter ending [*] and [*] shall
        occur no later than [*]). Schering and COR acknowledge and agree that
        the [*] for the payment made pursuant to this Section 9.4(a) is being
        provided for [*] and [*] to any Third Party in any way. Such [*]
        information shall be deemed to be "Confidential Information" under the
        Agreement, subject to all applicable terms and provisions relating
        thereto. In the event of termination of the foregoing receivables
        management provision, either by reason of time (under new Section 7.5,
        as amended herein) or a [*] (as defined herein), Section 9.4(a) shall be
        [*] although the Parties shall complete the [*] of payments for any
        quarters when the revised Section 9.4(a) was in effect."



                    [*] =  Confidential Treatment Requested

                                       3.
<PAGE>   4
CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.


V.      INVENTORY MANAGEMENT

        The Parties agree that Section 7.5 shall be amended by deleting Section
7.5(a) and 7.5(b)(i)-(iii), and replacing such Sections with the following text.
The Parties further agree that current Section 7.5(b)(iv) shall be redesignated
as Section 7.5(h), current Section 7.5(c) shall re redesignated as Section
7.5(i), and the Current Section 7.5(d) shall be redesignated as Section 7.5(i).

               "7.5  INVENTORY

               (a) The Parties agree that, pursuant to Section 2.2, the JSC is
        permitted to establish a subcommittee (which may or may not include
        members of the JSC itself) to oversee particular activities and such
        subcommittee shall be constituted and operate as the JSC agrees. The
        Parties anticipate that promptly following the Amendment Effective Date
        the JSC shall establish a Joint Production Committee ("JPC") which shall
        coordinate material management, establish accounting for inventory of
        both bulk and finished Integrelin Product, all in accordance with the
        terms, conditions and obligations set forth in Sections 7.5(b)-(g).

               (b) The JPC shall meet quarterly to provide the JSC with
        recommendations pertaining to the production strategies for production
        of Integrelin Product. The participants and full responsibilities of the
        JPC shall be determined by the JSC but the JPC shall at least consist of
        representatives from the following disciplines at Schering and
        corresponding counterparts at COR: Domestic and Global Marketing,
        Finance, and Production Planning. The responsibilities of the JPC shall
        include, without limitation, the following:

                      (i) Recommend to the JSC production requirements based on
        sales forecast and inventory;

                      (ii) Recommend to the JSC future order amounts prior to
        making any commitments to third party suppliers;

                      (iii) Recommend to the JSC product sourcing strategies
        among available suppliers;

                      (iv) Determine the [*] of both bulk Integrelin and
        finished Integrelin Product (This will be established on an annual
        basis. [*] for the following year shall be determined at the third
        quarterly meeting of the current year);

                      (v) Reconcile and determine [*] that Schering provides
        COR, calculated as set forth in Section 7.5(d); and

                      (vi) Recommend to the JSC an Integrelin Product allocation
        between domestic, international, and clinical [*].

               (c) To commence the [*] process as set forth in Section 7.5(d),
        Schering shall pay COR, at [*] for Integrelin Product that is in
        Schering's possession as of [*]. In


                    [*] =  Confidential Treatment Requested

                                       4.
<PAGE>   5
CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.


        addition, Schering shall pay COR an amount which increases Schering's
        existing [*] to [*] of the ending balance of "COR's Inventory" (as
        defined in Section 7.5(g)) as of [*]. As [*] are made, Schering (at its
        own expense) shall be [*] in all of [*] for the [*] under Sections
        7.5(c) and 7.5(d) (the [*]). Schering shall make the payment under this
        Section 7.5(c) within [*] days of receipt from COR of a report detailing
        "COR's Inventory" as defined in Section 7.5(g).

               (d) To support COR's ongoing inventory investment, Schering shall
        provide COR with a [*] for materials purchased under the approved
        JSC/JPC production plan, calculated as follows:

                      (i) From [*], for the inventory investment related to the
        Integrelin Product for use in the Co-Promotion Territory and the Royalty
        Territory (including [*]), the amount of [*] made to COR shall equal the
        sum of (A) [*], and (B) [*]. The [*] balance shall be adjusted on a
        quarterly basis, according to the change in the ending balance of "COR's
        Inventory" as of the last day of each of the following months: January,
        April, July and October. Any adjustment to the [*] balance shall be made
        within [*] days of Schering's receipt from COR of a report detailing
        "COR's Inventory" (as defined in Section 7.5(g)). [*] or [*] as
        applicable.

                      (ii) After [*], for the inventory investment related to
        the Integrelin Product for use in [*] and the Royalty Territory, [*] and
        no later than [*] COR shall [*] for use in the [*]. In addition, after
        COR's [*] as provided in this Section 7.5(d)(ii), Schering shall do all
        acts that may be necessary or appropriate to [*] in "COR's Inventory".

                      (iii) After [*], until COR has commenced Co-Promotion in
        at least [*], Schering shall continue to provide [*] to COR at the rate
        shown in 7.5(d)(i), for the inventory investment related to the
        Integrelin Product for use in Co-Promotion Territory (other than [*]).
        After COR has commenced Co-Promotion in at least [*] shall be provided
        by Schering. Within [*] days after COR has commenced Co-Promotion in at
        least [*], COR shall [*] to Schering the [*] for use in the Co-Promotion
        Territory. In addition, after COR's [*] as provided in this Section
        7.5(d)(iii) Schering shall do all acts that may be necessary or
        appropriate to [*] in "COR's Inventory".

        The Parties acknowledge and agree that any [*] relating to inventory
        made by Schering to COR prior to [*]. Upon termination of the [*]
        arrangement set forth in Section 7.5(d)(ii) and 7.5(d)(iii), the Parties
        agree that the terms and provisions of Section 9.4(a) as set forth in
        the [*] and [*].

               (e) Upon shipment to Schering of any Integrelin Product, title to
        such Integrelin Product shall be transferred over to Schering and COR
        shall bill Schering and Schering shall pay COR within [*] after receipt
        of COR's invoice for such Integrelin Product based on the predetermined
        [*] by the JPC.


                    [*] =  Confidential Treatment Requested

                                       5.
<PAGE>   6
CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.


               (f) Any manufacturing variances will be reconciled on a quarterly
        basis, and shall be considered as Allowable Expenses in the quarterly
        settlement.

               (g) For purposes of this Agreement, "COR's Inventory" shall mean
        the following each as authorized by the JSC:

                      (i) Prepayments made by COR to suppliers for future orders
        of bulk and finished Integrelin Product;

                      (ii) Bulk and finished Integrelin Product in stock; and

                      (iii) Bulk and finished Integrelin Product owned by COR at
        suppliers' or Third Party warehouse."

VI.     MISCELLANEOUS

        A. The Parties agree that promptly after the Amendment Effective Date,
but in no event later than 45 days after the Amendment Effective Date,
operational representatives of both Schering and COR shall meet in good faith
[*] in a timely manner [*], including but not limited to, [*].

        B. Promptly after the Amendment Effective Date, the Parties shall
prepare and execute [*]. Each Party shall bear its own expenses in the
preparation of such agreement, but Schering shall reimburse COR for any
out-of-pocket expenses incurred in [*] (other than the fees and expenses of
COR's counsel, which shall be borne by COR).

        C. In the event of any Change of Control of COR, whether in a merger,
sale of stock, sale of assets or other transaction, then the [*]. In that event,
Sections 7.5(b), (e), (f), (g), (h), (i) and (j) [*], and [*] set forth in this
Amendment. For purposes of this paragraph, a "Change of Control" of COR shall
have the meaning set forth in Exhibit 1 attached hereto and incorporated hereby.
In the event of an acquisition, whether by merger, sale of stock, sale of assets
or other transaction, which does not meet the definition of a Change of Control
of COR, [*].

        D. Each Party agrees to act in good faith and do all other acts as may
be necessary or appropriate in order to carry out the purposes and intent of
this Amendment.

        E. This Amendment has been prepared jointly and shall not be strictly
construed against either Party.

        F. The terms, conditions and existence of this Agreement shall be
treated by the Parties on a confidential basis, subject to Section 13.3 of the
Agreement ("Publicity") and subject further to appropriate disclosure to
employees and shareholders of Schering-Plough Corporation (the corporate parent
of Schering) and its Affiliates and/or COR, or as otherwise required by law.
Each of Schering and COR agrees to coordinate both the timing and content of any
public announcements relating to this Amendment and any such public
announcements shall be subject to the review and approval of the Parties prior
to public disclosure.


                    [*] =  Confidential Treatment Requested

                                       6.
<PAGE>   7
CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.


        G. This Amendment to the extent set forth herein, amends, modifies and
supplements the Agreement. This Amendment contains the entire agreement between
the Parties hereto, and the terms of this Amendment are contractual and not a
mere recital. Except as expressly modified herein, all of the terms and
provisions of the Agreement remain in full force and effect and cannot be
amended, modified or changed in any way whatsoever except by a written
instrument duly executed by the Parties hereto.





                  [Remainder of Page intentionally left blank]



                    [*] =  Confidential Treatment Requested

                                       7.
<PAGE>   8
CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.


        IN WITNESS WHEREOF, the Parties have executed this Amendment by their
authorized officers effective as of the last date below.

SCHERING CORPORATION                              COR THERAPEUTICS, INC.



By: /s/ Thomas C. Lauda                      By:  /s/ Laura S. Brege
   ------------------------------------          ------------------------------
        Thomas C. Lauda                             Laura S. Brege

        Title: Executive Vice President             Title: Senior Vice President

Date: 12/23/98                               Date: 12/23/98
     ----------------------------------           ------------------------------


SCHERING PLOUGH LTD.



By: /s/ Thomas C. Lauda
   ------------------------------------
        Thomas C. Lauda
        Title: Manager (Director)

Date: 12/23/98
     ----------------------------------


                    [*] =  Confidential Treatment Requested

                                       8.
<PAGE>   9
CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS,
HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.



                                 EXHIBITS INDEX


                                    EXHIBIT 1



        For purposes of this Amendment, "Change of Control" shall mean:

    [*]



                    [*] =  Confidential Treatment Requested


<PAGE>   1

                                                                    EXHIBIT 23.1

CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS

We consent to the incorporation by reference in the Registration Statements
(Form S-8 Numbers 333-49567, 33-42912, 33-66296, 33-82306, 33-82308 and
333-31801) pertaining to the 1998 Non-Officers' Equity Incentive Plan, the 1988
Employee Stock Option Plan, the 1988 Consulting Stock Option Plan, the 1991
Equity Incentive Plan, the 1991 Employee Stock Purchase Plan and the 1994
Non-Employee Directors' Stock Option Plan of COR Therapeutics, Inc of our 
report dated January 19, 1999, with respect to the financial statements of 
COR Therapeutics, Inc. included in its Annual Report (Form 10-K) for the 
year ended December 31, 1998.

                                             ERNST & YOUNG LLP



Palo Alto, California
March 23, 1999






<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE BALANCE
SHEET DATED DECEMBER 31, 1998 AND THE STATEMENT OF OPERATIONS FOR THE YEAR
ENDED DECEMBER 31, 1998 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS AND THE NOTES THERETO.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               DEC-31-1998
<CASH>                                          10,532
<SECURITIES>                                    64,673
<RECEIVABLES>                                    2,398
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                                97,656
<PP&E>                                          26,113
<DEPRECIATION>                                (20,676)
<TOTAL-ASSETS>                                 103,093
<CURRENT-LIABILITIES>                           45,236
<BONDS>                                              0
                                0
                                          0
<COMMON>                                             2
<OTHER-SE>                                      54,596
<TOTAL-LIABILITY-AND-EQUITY>                   103,093
<SALES>                                              0
<TOTAL-REVENUES>                                41,963
<CGS>                                                0
<TOTAL-COSTS>                                        0
<OTHER-EXPENSES>                                73,192
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 727
<INCOME-PRETAX>                               (27,614)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                           (27,614)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                  (27,614)
<EPS-PRIMARY>                                   (1.14)<F1>
<EPS-DILUTED>                                   (1.14)
<FN>
<F1>For Purposes of this Exhibit, Primary means Basic.
</FN>
        

</TABLE>


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