GERON CORPORATION
424B3, 1999-11-24
PHARMACEUTICAL PREPARATIONS
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<PAGE>   1

                                                                  Rule 424(b)(3)
                                                      Registration No. 333-89861





                                GERON CORPORATION

                                2,100,000 SHARES
                                 OF COMMON STOCK


    The selling stockholders are offering up to 2,100,000 shares of Geron
Corporation common stock.

    Our common stock trades on the Nasdaq National Market under the symbol GERN.
On November 10, 1999, the last reported sale price of our common stock was
$10.13 per share.

    We will not be paying any underwriting discounts or commissions in this
offering.

    INVESTING IN OUR COMMON STOCK INVOLVES A HIGH DEGREE OF RISK. SEE "RISK
FACTORS" BEGINNING ON PAGE 4.

    THE SECURITIES AND EXCHANGE COMMISSION AND STATE SECURITIES REGULATORS HAVE
NOT APPROVED OR DISAPPROVED THESE SECURITIES OR DETERMINED IF THIS PROSPECTUS IS
TRUTHFUL OR COMPLETE.
ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

November 10, 1999

<PAGE>   2

                                TABLE OF CONTENTS



<TABLE>
<CAPTION>
                                                                                     PAGE
                                                                                     ----
<S>                                                                                  <C>
INFORMATION ABOUT GERON.................................................................2

RECENT DEVELOPMENT......................................................................3

RISK FACTORS............................................................................4

YOU SHOULD NOT RELY ON FORWARD-LOOKING STATEMENTS BECAUSE THEY
ARE INHERENTLY UNCERTAIN...............................................................17

WHERE CAN YOU FIND MORE INFORMATION....................................................17

USE OF PROCEEDS........................................................................19

SELLING STOCKHOLDERS...................................................................20

PLAN OF DISTRIBUTION...................................................................21

LEGAL MATTERS..........................................................................22

EXPERTS................................................................................22
</TABLE>


    We have not authorized any dealer, salesperson or other person to give any
information or represent anything not contained in this prospectus. You should
not rely on any unauthorized information. This prospectus does not offer to sell
or buy any shares in any jurisdiction in which it is unlawful. The information
in this prospectus is current as of the date on the cover.



                                       1.
<PAGE>   3

                             INFORMATION ABOUT GERON

    We are a biopharmaceutical company focused on discovering, developing and
commercializing therapeutic and diagnostic products to treat cancer and other
age-related chronic degenerative diseases. Our technology includes the discovery
of small molecule inhibitors of telomerase for cancer therapy; telomere and
telomerase-based research and diagnostic tools; telomerase activation to extend
the replicative lifespan of normal cells; and complementary stem cell, gene
therapy and nuclear transfer approaches to restore the function of degenerating
organs. Telomeres are structures at the ends of chromosomes that protect
chromosomes from degradation and act as a molecular clock of cellular aging.
Telomerase is an enzyme that has the capability of restoring telomere length and
stopping the molecular clock, thereby conferring cellular immortality. By
manipulating telomere length through telomerase regulation, we hope to be able
to kill cancer cells where telomerase is abnormally turned on. Conversely, we
seek to increase the lifespan of normal cells, where telomerase is normally
turned off, to treat age-related diseases.

    We were incorporated in 1990 under the laws of Delaware. Our principal
executive offices are located at 230 Constitution Drive, Menlo Park, California
94025 and our telephone number is (650) 473-7700. References in this prospectus
to "we," "us," "our," and "Geron" refer to Geron Corporation and its
subsidiaries.



                                       2.
<PAGE>   4

                               RECENT DEVELOPMENT

    On September 30, 1999, we completed a private placement of $12.5 million
face amount of Series C two percent (2%) convertible debentures and warrants to
purchase up to 1.1 million shares of our common stock, for an aggregate purchase
price of $12.5 million. The debentures are convertible into common stock at the
option of the holder until the date which is three years following the date of
issuance at a conversion price of $10.25 per share, subject to adjustment under
certain circumstances. The debentures are convertible at our option when the
closing bid price of our common stock on the Nasdaq National Market is greater
than 175% of the conversion price for ten consecutive trading days. The warrants
are exercisable for common stock at the option of the holder until the earlier
of (i) 540 days after our authorized common stock is duly increased by at least
1,710,381 shares or (ii) September 21, 2001. The exercise price is $12.50 per
share for 1,000,000 warrants and $12.75 per share for 100,000 warrants, subject
to adjustment under certain circumstances. Under the terms of the private
placement, we agreed to file a registration statement on Form S-3 to cover the
shares of common stock issuable upon conversion of the debentures and exercise
of the warrants.



                                       3.
<PAGE>   5

                                  RISK FACTORS

    Before you invest in our common stock, you should be aware that there are
various risks, including those described below. You should carefully consider
these risk factors, together with all of the other information included in this
prospectus, before you decide whether to purchase shares of our common stock.
Any of these risks could materially adversely affect our business, operating
results and financial condition.

OUR PRODUCT DEVELOPMENT PROGRAMS ARE AT AN EARLY STAGE AND MAY NOT RESULT IN ANY
COMMERCIALLY VIABLE PRODUCTS; FAILURE TO DEVELOP ANY COMMERCIALLY VIABLE
PRODUCTS MAY IMPAIR OUR ABILITY TO ATTRACT FUTURE FUNDING AND OUR ABILITY TO
SUSTAIN OPERATIONS

    The study of the mechanisms of cellular aging and cellular immortality,
including telomere biology and telomerase, the study of human pluripotent stem
cells, and the process of nuclear transfer are relatively new areas of research.
While our development efforts are at different stages for different products, we
cannot assure you that we will successfully develop any products or that we will
not abandon some or all of our proposed research programs. In the long term, for
any of our cancer treatments or other discoveries to be proven commercially
viable, we will need to demonstrate to the health care community that the
treatment or products are:

        - safe;

        - effective;

        - reliable; and

        - not subject to other problems that would affect commercial viability.

    If and when potential lead drug compounds or product candidates are
identified through our research programs, they will require significant
preclinical and clinical testing prior to regulatory approval in the United
States and elsewhere. In addition, we will also need to determine whether any of
these potential products can be manufactured in commercial quantities at an
acceptable cost. Our efforts may not result in a product that can be marketed.
Because of the significant scientific, regulatory and commercial milestones that
must be reached for any of our research programs to be successful, any program
may be abandoned, even after significant resources have been expended.

    Our inability to identify an effective compound for inhibiting telomerase
    may prevent us from developing a viable cancer treatment product, which
    would adversely impact our future business prospects

    As a result of our drug discovery efforts to date, we have identified
compounds in laboratory studies that demonstrate potential for inhibiting
telomerase in humans. However, additional development efforts will be required
before we select a lead compound for preclinical development and clinical trials
as a telomerase inhibitor for cancer. We will have to conduct additional
research before we can select a compound and we may never identify a compound
that will enable us to fully develop a commercially viable treatment for cancer.

    If and when selected, a lead compound may prove to have undesirable and
unintended side effects or other characteristics affecting its safety or
effectiveness that may prevent or limit its commercial use. In terms of safety,
our discoveries may result in cancer treatment solutions that cause unacceptable
side effects for the human body. Our discoveries may also not be as effective as
is necessary to market a commercially viable product for the treatment of
cancer. For example, we expect that telomerase inhibition may have delayed
effectiveness as telomeres resume normal shortening. As a result, telomerase
inhibition may need to be used in conjunction with other cancer therapies.
Accordingly, it may become extremely difficult for us to proceed with
preclinical and clinical development, to obtain regulatory approval or to market
a telomerase inhibitor for the treatment of cancer. If we abandon our research
for cancer treatment for any of these reasons or for other reasons, our business
prospects would be materially and adversely affected.

    Our research related to the treatment of age-related degenerative diseases
    has not yet identified a compound that has potential as a therapeutic agent
    and failure to do so would lead to the termination of this program

    The research resulting from our telomerase activation and expression program
has shown us that the activation of telomerase can extend cell lifespan in
normal human cells. While telomere length and replicative capacity have



                                       4.
<PAGE>   6

been extended in laboratory studies, we may not discover a compound that will
modulate telomere length or increase replicative capacity effectively for
clinical use. We have yet to identify any lead compounds that have been
demonstrated to modulate gene expression in human cells and we cannot guarantee
that we will be able to discover or develop the necessary compound.

    There is currently insufficient clinical data to determine the full utility
    of our cancer diagnostic tests and negative data could cause cancellation of
    the program.

    There is, as yet, insufficient clinical data to confirm the full utility of
our proprietary telomerase detection technology to diagnose, prognose, monitor
patient status and screen for cancer. Although Intergen, Roche Diagnostics,
Kyowa Medex and PharMingen, our licensees, have begun to sell kits for research
use, additional development work and regulatory consents will be necessary prior
to the introduction of tests for clinical use.

    Our research on human pluripotent stem cells is at an early stage and may
    not result in any commercially viable products

    Our pluripotent stem cell therapies program is also at an early stage. While
human pluripotent stem cells have been derived and allowed to expand and
differentiate into numerous cell types, our efforts to direct differentiation of
human pluripotent stem cells and develop products from our research may not
result in any commercial applications.

    Our research related to nuclear transfer may not result in any commercially
viable products

    Nuclear transfer techniques are still in the process of being fully
understood. Our research collaboration with the Roslin Institute focuses at its
most fundamental level on understanding the molecular mechanisms used by egg
cell cytoplasm to reprogram adult cells. Our goal is to confer reprogramming
capability to the cytoplasm of any mature cell in order to produce
transplantable tissue-matched cells for an intended transplant recipient.
However, our research in this area is in its early stages and may not result in
any commercially viable products for human health or agriculture.

WE HAVE A HISTORY OF OPERATING LOSSES AND ANTICIPATE FUTURE LOSSES; CONTINUED
LOSSES COULD IMPAIR OUR ABILITY TO SUSTAIN OPERATIONS

    We have incurred net operating losses every year since our operations began
in 1990. As of September 30, 1999, our accumulated deficit was approximately
$94.9 million. Losses have resulted principally from costs incurred in
connection with our research and development activities and from general and
administrative costs associated with our operations. We expect to incur
additional operating losses over the next several years as our research and
development efforts and preclinical testing activities are expanded.
Substantially all of our revenues to date have been research support payments
under the collaborative agreements with Kyowa Hakko and Pharmacia & Upjohn.
Research support payments under the agreement with Kyowa Hakko expired in April
1998. Research payments under the agreement with Pharmacia & Upjohn expire in
January 2000. We are unable to estimate at this time the level of revenue to be
received from the sale of diagnostic products, and do not expect to receive
significant revenues from the sale of research-use-only kits. Our ability to
achieve profitability is dependent on our ability, alone or with others, to:

        - continue to have success with our research and development efforts;

        - select therapeutic compounds for development;

        - obtain the required regulatory approvals; and

        - manufacture and market resulting products.

    We cannot assure you when or if we will receive material revenues from
product sales or achieve profitability. Failure to generate significant
additional revenues and achieve profitability could impair our ability to
sustain operations.



                                       5.
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WE DEPEND ON OUR COLLABORATIVE PARTNERS TO HELP US COMPLETE THE PROCESS OF
DEVELOPING AND TESTING OUR PRODUCTS AND OUR ABILITY TO DEVELOP AND COMMERCIALIZE
PRODUCTS MAY BE IMPAIRED OR DELAYED IF OUR COLLABORATIVE PARTNERSHIPS ARE
UNSUCCESSFUL

    Our strategy for the development, clinical testing and commercialization of
our products requires entering into collaborations with corporate partners,
licensors, licensees and others. We are dependent upon the subsequent success of
these other parties in performing their respective responsibilities and the
continued cooperation of our partners. We cannot assure you that our partners
will cooperate with us or perform their obligations under our agreements with
them. We cannot control the amount and timing of our collaborators' resources
that will be devoted to our research activities related to our collaborative
agreements with them. Our collaborators may choose to pursue existing or
alternative technologies in preference to those being developed in collaboration
with us.

    Our ability to successfully develop and commercialize telomerase inhibition
products depends on our corporate partnerships with Kyowa Hakko and Pharmacia &
Upjohn, and our ability to successfully develop and commercialize telomerase
diagnostic products depends on our corporate partnership with Roche Diagnostics.
Under our collaborative agreements with these partners, we rely significantly on
them, among other activities, to:

        - design and conduct advanced clinical trials;

        - fund research and development activities with us;

        - pay us fees upon the achievement of milestones; and

        - co-promote with us any commercial products that result from our
          collaborations.

    The development and commercialization of products from these collaborations
will be delayed if Kyowa Hakko, Pharmacia & Upjohn or Roche Diagnostics fail to
conduct these collaborative activities in a timely manner or at all. In
addition, Kyowa Hakko, Pharmacia & Upjohn or Roche Diagnostics could terminate
these agreements and we cannot assure you that we will receive any development
or milestone payments. If we do not receive research funds or achieve milestones
set forth in the agreements, or if Kyowa Hakko, Pharmacia & Upjohn or Roche
Diagnostics or any of our future partners breach or terminate collaborative
agreements with us, our business may be damaged significantly.

    We are also, to a lesser extent, dependent upon collaborative partners other
than Kyowa Hakko, Pharmacia & Upjohn and Roche Diagnostics. For example, we have
entered into licensing arrangements with several diagnostic companies for our
telomerase detection technology. However, because these licenses are limited to
the research-use-only market, these arrangements are not expected to generate
significant commercial revenues, if at all.

UNEXPECTED COSTS AND OTHER DIFFICULTIES ARISING FROM OUR ACQUISITION OF ROSLIN
BIO-MED LTD. AND SIMULTANEOUS RESEARCH COLLABORATION WITH THE ROSLIN INSTITUTE
MAY DRAIN HUMAN AND FINANCIAL RESOURCES, OR OTHERWISE NEGATIVELY AFFECT OUR
OPERATIONS

    In May 1999, we acquired Roslin Bio-Med, a private company located in
Scotland which was established by the Roslin Institute to develop nuclear
transfer technology. Our acquisition of Roslin Bio-Med and formation of a
research collaboration with the Roslin Institute have expanded the scope of our
business and operations. As a result, we may be presented with operational
issues that we have not previously faced as a company, but which generally
accompany acquisitions and research collaborations of this nature, including:

        - the difficulty of assimilating Roslin Bio-Med's operations and
          personnel;

        - the potential disruption of ongoing business and distraction of
          management;

        - unanticipated expenses related to technology and research integration;

        - the difficulty of implementing and maintaining uniform standards,
          controls, procedures and policies;

        - the potential impairment of relationships with employees and
          collaborators as a result of integration of new management personnel;
          and

        - the potential unknown liabilities associated with acquired businesses.



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    We cannot assure you that we will be able to overcome any of these
obstacles, and our failure to do so could prevent us from achieving the
perceived benefits of the acquisition and collaboration and negatively impact
our research activities and results of operations.

    In addition, our agreement with the Roslin Institute obligates us to provide
approximately $21 million in development funding. If we are unable to fulfill
this significant obligation, the Roslin Institute could terminate the agreement
and we would lose our rights to the technology.

THE ACQUISITION OF ROSLIN BIO-MED HAS SUBJECTED US TO THE UNCERTAINTY INHERENT
IN INTERNATIONAL OPERATIONS, AND WE HAVE LIMITED EXPERIENCE WITH INTERNATIONAL
OPERATIONS

    To date, we have only limited experience in managing operations
internationally. Our acquisition of Roslin Bio-Med represents our first
experience in managing international operations. As a result of our
international expansion, we are now subject to the uncertainties inherent in
international operations, including:

        - unexpected changes in regulatory requirements;

        - compliance with international laws;

        - difficulties in staffing and managing international operations
          including those that arise as a result of distance, language and
          cultural differences;

        - currency exchange rate fluctuations;

        - political instability;

        - export restrictions; and

        - potentially adverse tax consequences.

    One or more of these factors could have a material adverse effect on our
future international operations, the success of our acquisition of Roslin
Bio-Med and, consequently, on our business, operating results, and financial
condition. Similarly, our collaborations with international partners such as the
Roslin Institute, Pharmacia & Upjohn, Kyowa Hakko and Roche Diagnostics could
also subject us to the above described international uncertainties.

IF WE ARE UNABLE TO ENTER INTO COLLABORATIVE RELATIONSHIPS FOR MANUFACTURING,
MARKETING AND SALES, WE WILL NEED TO DEVELOP THESE CAPABILITIES ON OUR OWN WHICH
WOULD BE COSTLY AND WOULD SLOW OUR PRODUCT DEVELOPMENT EFFORTS

    We currently have no manufacturing infrastructure and no marketing or sales
organization. As a result, we intend to rely almost entirely on our current and
future collaborative partners for manufacturing and principal marketing and
sales responsibilities for any potential products. To the extent that we choose
not to or are unable to establish these arrangements, we will require
substantially greater capital to develop our own manufacturing, marketing and
sales capabilities.

    We cannot assure you that we will be able to negotiate additional strategic
arrangements in the future on acceptable terms, if at all, or that any potential
strategic arrangement will be successful. In the absence of these arrangements,
we may encounter significant delays in introducing any product or find that the
research, development, manufacture, marketing or sale of any product is
adversely affected. In the event we need to enter into strategic arrangements in
the future, but are unable to do so, our business will be significantly and
negatively impacted.

OUR RELIANCE ON THE RESEARCH ACTIVITIES OF OUR NON-EMPLOYEE SCIENTIFIC ADVISORS
AND OTHER RESEARCH INSTITUTIONS, WHOSE ACTIVITIES ARE NOT WHOLLY WITHIN OUR
CONTROL, MAY LEAD TO DELAYS IN TECHNOLOGICAL DEVELOPMENTS

    We rely extensively and have relationships with scientific advisors at
academic and other institutions, some of whom conduct research at our request.
These scientific advisors are not our employees and may have commitments to, or
consulting or advisory contracts with, other entities that may limit their
availability to us. We have limited control over the activities of these
advisors and, except as otherwise required by our collaboration and consulting
agreements, can expect only limited amounts of their time to be dedicated to our
activities. If our scientific advisors



                                       7.
<PAGE>   9

are unable or refuse to contribute to the development of any of our potential
discoveries, our ability to generate significant advances in our technologies
will be significantly harmed.

    In addition, we have formed research collaborations with many academic and
other research institutions throughout the world, including the Roslin
Institute. These research facilities may have commitments to other commercial
and non-commercial entities. We have limited control over the operations of
these laboratories and can expect only limited amounts of time to be dedicated
to our research goals.

IMPAIRMENT OF OUR INTELLECTUAL PROPERTY RIGHTS, WHICH ARE COSTLY AND DIFFICULT
TO PROTECT, MAY LIMIT OUR ABILITY TO PURSUE THE DEVELOPMENT OF OUR INTENDED
TECHNOLOGIES AND PRODUCTS

    Our success will depend on our ability to obtain and enforce patents for our
    discoveries; however, legal principles for biotechnology patents are not
    firmly established and the extent to which we will be able to obtain patent
    coverage is uncertain

    Protection of our proprietary compounds and technology is critically
important to our business. Our success will depend in part on our ability to
obtain and enforce our patents and maintain trade secrets, both in the United
States and in other countries. The patent positions of pharmaceutical and
biopharmaceutical companies, including ours, are highly uncertain and involve
complex legal and technical questions for which legal principles are not firmly
established. We cannot assure you that we will continue to develop products or
processes that are patentable or that patents will issue from any of our pending
applications, including allowed patent applications. Further, we cannot assure
you that our current patents, or patents that issue on pending applications,
will not be challenged, invalidated or circumvented, or that our current or
future patent rights will provide proprietary protection or competitive
advantages to us. In the event that we are unsuccessful in obtaining and
enforcing patents, our business would be negatively impacted.

    Patent applications in the United States are maintained in secrecy until
patents issue. Publication of discoveries in the scientific or patent literature
tends to lag behind actual discoveries by at least several months and sometimes
several years. Therefore, we cannot assure you that the persons or entities that
we or our licensors name as inventors in our patents and patent applications
were the first to invent the inventions disclosed in the patent applications or
patents, or file patent applications for these inventions. As a result, we may
not be able to obtain patents from discoveries that we otherwise would consider
patentable and that we consider to be extremely significant to our future
success.

    Patent prosecution or litigation may also be necessary to obtain patents,
enforce any patents issued or licensed to us or to determine the scope and
validity of our proprietary rights or the proprietary rights of another. We
cannot assure you that we would be successful in any patent prosecution or
litigation. Patent prosecution and litigation in general can be extremely
expensive and time consuming, even if the outcome is favorable to us. An adverse
outcome in a patent prosecution, litigation or any other proceeding in a court
or patent office could subject our business to significant liabilities to other
parties, require disputed rights to be licensed from other parties or require us
to cease using the disputed technology.

    We may be subject to infringement claims that are costly to defend, and
    which may limit our ability to use disputed technologies and prevent us from
    pursuing research and development or commercialization of potential products

    Our commercial success depends significantly on our ability to operate
without infringing patents and proprietary rights of others. We cannot assure
you that our technologies do not and will not infringe the patents or
proprietary rights of others. In the event our technologies do infringe on the
rights of others, we may be prevented from pursuing research, development or
commercialization of potential products or may be required to obtain licenses to
these patents or other proprietary rights or develop or obtain alternative
technologies. We may not be able to obtain alternative technologies or any
required license on commercially favorable terms, if at all. If we do not obtain
the necessary licenses or alternative technologies, we may be delayed or
prevented from pursuing the development of some potential products. Our breach
of an existing license or failure to obtain alternative technologies or a
license to any technology that we may require to develop or commercialize our
products will significantly and negatively affect our business.



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    Patent law relating to the scope and enforceability of claims in the
technology fields in which we operate is still evolving, and the degree of
future protection for any of our proprietary rights is highly uncertain. In this
regard we cannot assure you that independent patents will issue from any of our
patent applications, some of which include many interrelated applications
directed to common or related subject matter. As a result, our success may
become dependent on our ability to obtain licenses for using the patented
discoveries of others. We are aware of patent applications and patents that have
been filed by others with respect to telomerase and telomere length technology
and we may have to obtain licenses to use this technology. For example, there
are a number of issued patents and pending applications owned by others directed
to differential display, stem cell and other technologies relating to our
research, development and commercialization efforts. We may also become aware of
discoveries and technology controlled by third parties that are advantageous to
our other research programs. We cannot assure you that our discoveries and
treatments can be further developed and commercialized without a license to
these discoveries or technologies. Moreover, other patent applications may be
granted priority over patent applications that we or any of our licensors have
filed. Furthermore, others may independently develop similar or alternative
technologies, duplicate any of our technologies or design around the patented
technologies we have developed. In the event that we are unable to acquire
licenses to critical technologies that we cannot patent ourselves, we may be
required to expend significant time and resources to develop similar technology,
and we may not be successful in this regard. If we cannot acquire or develop the
necessary technology, we may be prevented from pursuing some of our business
objectives. Moreover, one of our competitors could acquire or license the
necessary technology. Any of these events could have a material adverse effect
on our business.

    We cannot assure you that we will not be subject to claims or litigation as
a result of entering into license agreements with third parties or infringing on
the patents of others. For example, we signed a licensing and sponsored research
agreement relating to our pluripotent stem cell therapies program with The Johns
Hopkins University School of Medicine in August 1997. Prior to signing this
agreement, we had been informed by a third party that we and Johns Hopkins
University would violate the rights of that third party and another academic
institution in doing so. After a review of the correspondence with the third
party and Johns Hopkins University, as well as related documents, including an
issued U.S. patent, we believe that both we and Johns Hopkins University have
substantial defenses to any claims that might be asserted by the third party. We
have agreed to provide indemnification to Johns Hopkins University relating to
potential claims. However, any litigation resulting from this matter may divert
significant resources, both financial and otherwise, from our research programs.
We cannot assure you that we would be successful if the matter is litigated. If
the outcome of litigation is unfavorable to us, our business could be materially
and adversely affected.

    Much of the information and know-how that is critical to our business is not
    patentable and we may not be able to prevent others from obtaining this
    information and establishing competitive enterprises

    We rely extensively on trade secrets to protect our proprietary technology,
especially in circumstances in which patent protection is not believed to be
appropriate or obtainable. We attempt to protect our proprietary technology in
part by confidentiality agreements with our employees, consultants and
contractors. We cannot assure you that these agreements will not be breached,
that we would have adequate remedies for any breach, or that our trade secrets
will not otherwise become known or be independently discovered by competitors,
any of which would harm our business significantly.

WE WILL NEED ADDITIONAL CAPITAL TO CONDUCT OUR OPERATIONS AND DEVELOP OUR
PRODUCTS, AND OUR ABILITY TO OBTAIN THE NECESSARY FUNDING IS UNCERTAIN

    We will require substantial capital resources in order to conduct our
operations and develop our products. We estimate that our existing capital
resources, payments under the Pharmacia & Upjohn collaborative agreement,
interest income and equipment financing will be sufficient to fund our current
level of operations through the second quarter of 2001. The timing and degree of
any future capital requirements will depend on many factors, including:

        - the accuracy of the assumptions underlying our estimates for our
          capital needs in 1999 and beyond;

        - continued scientific progress in our research and development
          programs;

        - the magnitude and scope of our research and development programs;



                                       9.
<PAGE>   11

        - our ability to maintain and establish strategic arrangements for
          research, development, clinical testing, manufacturing and marketing;

        - our progress with preclinical and clinical trials;

        - the time and costs involved in obtaining regulatory approvals;

        - the costs involved in preparing, filing, prosecuting, maintaining,
          defending and enforcing patent claims; and

        - the potential for new technologies and products.

    We intend to acquire additional funding through strategic collaborations,
public or private equity financings and capital lease transactions. Additional
financing may not be available on acceptable terms, or at all. Additional equity
financings could result in significant dilution to stockholders. Further, in the
event that additional funds are obtained through arrangements with collaborative
partners, these arrangements may require us to relinquish rights to some of our
technologies, product candidates or products that we would otherwise seek to
develop or commercialize ourselves. If sufficient capital is not available, we
may be required to delay, reduce the scope of or eliminate one or more of our
research or development programs, each of which could have a material adverse
effect on our business.

SOME OF OUR COMPETITORS MAY DEVELOP TECHNOLOGIES THAT ARE SUPERIOR TO OR MORE
COST-EFFECTIVE THAN OURS, WHICH MAY IMPACT THE COMMERCIAL VIABILITY OF OUR
TECHNOLOGIES AND WHICH MAY SIGNIFICANTLY DAMAGE OUR ABILITY TO SUSTAIN
OPERATIONS.

    The pharmaceutical and biopharmaceutical industries are intensely
competitive. We believe that other pharmaceutical and biopharmaceutical
companies and research organizations currently engage in or have in the past
engaged in efforts related to the biological mechanisms of cell aging and cell
immortality, including the study of telomeres, telomerase, human pluripotent
stem cells, and nuclear transfer. In addition, other products and therapies that
could compete directly with the products that we are seeking to develop and
market currently exist or are being developed by pharmaceutical and
biopharmaceutical companies, and by academic and other research organizations.
Many companies are also developing alternative therapies to treat cancer and, in
this regard, are competitors of ours. The pharmaceutical companies developing
and marketing these competing products have significantly greater financial
resources and expertise than we do in:

        - research and development;

        - manufacturing;

        - preclinical and clinical testing;

        - obtaining regulatory approvals; and

        - marketing.

    Smaller companies may also prove to be significant competitors, particularly
through collaborative arrangements with large and established companies.
Academic institutions, government agencies and other public and private research
organizations may also conduct research, seek patent protection and establish
collaborative arrangements for research, clinical development and marketing of
products similar to ours. These companies and institutions compete with us in
recruiting and retaining qualified scientific and management personnel as well
as in acquiring technologies complementary to our programs. There is also
competition for access to libraries of compounds to use for screening. Should we
fail to secure and maintain access to sufficiently broad libraries of compounds
for screening potential targets, our business would be materially harmed. In
addition to the above factors, we expect to face competition in the following
areas:

        - product efficacy and safety;

        - the timing and scope of regulatory consents;

        - availability of resources;

        - reimbursement coverage;

        - price; and

        - patent position, including potentially dominant patent positions of
          others.



                                      10.
<PAGE>   12

    As a result of the foregoing, our competitors may develop more effective or
more affordable products, or achieve earlier patent protection or product
commercialization than us. Most significantly, competitive products may render
our products that we develop obsolete.

THE LOSS OF KEY PERSONNEL COULD SLOW OUR ABILITY TO CONDUCT RESEARCH AND
DEVELOP PRODUCTS

    Our future success depends to a significant extent on the skills, experience
and efforts of our executive officers and key members of our scientific staff.
The loss of any or all of these individuals could damage our business and might
significantly delay or prevent the achievement of research, development or
business objectives.

    We also rely on consultants and advisors, including the members of our
Scientific Advisory Board, who assist us in formulating our research and
development strategy. We face intense competition for qualified individuals from
numerous pharmaceutical, biopharmaceutical and biotechnology companies, as well
as academic and other research institutions. We may not be able to attract and
retain these individuals on acceptable terms. Failure to do so would adversely
affect our business.

THE ETHICAL, LEGAL AND SOCIAL IMPLICATIONS OF THE PLURIPOTENT STEM CELL
THERAPIES AND NUCLEAR TRANSFER PROGRAMS COULD PREVENT US FROM DEVELOPING OR
GAINING ACCEPTANCE FOR COMMERCIALLY VIABLE PRODUCTS IN THIS AREA

    Our pluripotent stem cell therapies program may involve the use of human
pluripotent stem cells that would be derived from human embryonic or fetal
tissue. The use of human pluripotent stem cells gives rise to ethical, legal and
social issues regarding the appropriate use of these cells. In the event that
our research related to human pluripotent stem cell therapies becomes the
subject of adverse commentary or publicity, our name and goodwill could be
adversely affected.

    In addition, our nuclear transfer program involves the same techniques that
have previously been utilized to clone sheep. It is possible that these nuclear
transfer techniques could also be used in attempts to reproductively clone
living human beings, an application that we believe to be unnecessary and
unethical. Although we and the Roslin Institute support the current
international prohibitions on human reproductive cloning, the process of nuclear
transfer itself still gives rise to ethical, legal and social issues regarding
the appropriate nature of this type of research. In the event that our research
related to nuclear transfer becomes the subject of adverse commentary or
publicity, our name and goodwill could be adversely affected.

    We have established an Ethics Advisory Board comprised of independent and
recognized medical ethicists to advise us with respect to these issues. Indeed,
the use of human pluripotent stem cell and nuclear transfer techniques in
scientific research is an issue of national interest. Many research
institutions, including several of our scientific collaborators, have adopted
policies regarding the ethical use of these types of human cells. These policies
may have the effect of limiting the scope of research conducted in this area.
The United States government currently does not fund research that involves the
use of human pluripotent cells or tissue and may in the future regulate or
otherwise restrict its use. The pluripotent stem cell therapies program would be
significantly harmed if we are prevented from conducting research on these cells
due to government regulation or otherwise. Also, in the event that regulatory
bodies ban nuclear transfer processes, our nuclear transfer program could be
cancelled and our business could be negatively affected.

OUR ABILITY TO EARN REVENUES FROM THE SALE OF MARKETABLE PRODUCTS IS PARTLY
DEPENDENT ON THE SCOPE OF GOVERNMENT REGULATION AND OUR SUCCESS IN OBTAINING
REGULATORY APPROVAL FOR OUR PRODUCTS

    Our business is subject to intense government regulation and this regulation
    may significantly impact our ability to create and market commercially
    viable products

    Federal, state and local governments in the United States and governments in
other countries have significant regulations in place that govern many of our
activities. The preclinical testing and clinical trials of the products that we
develop ourselves or that our collaborative partners develop are subject to
intense government regulation and may prevent us from creating commercially
viable products from our discoveries. In addition, the sale by us or our



                                      11.
<PAGE>   13

collaborative partners of any commercially viable product will be subject to
government regulation from several standpoints, including the processes of:

        - manufacturing;

        - labeling;

        - selling;

        - distributing;

        - marketing;

        - advertising; and

        - promoting.

    We cannot assure you that we will be able to comply with these regulations
for any of our potentially marketable products. To the extent that we are
unable, our ability to earn revenues will be significantly and negatively
impacted.

    The regulatory process, particularly for biopharmaceutical products like
ours, is uncertain, can take many years and requires the expenditure of
substantial resources. Any product that we or our collaborative partners develop
must receive all relevant regulatory agency approvals or clearances, if any,
before it may be marketed in the United States or other countries. Generally,
biological drugs and non-biological drugs are regulated more rigorously than
medical devices. In particular, human pharmaceutical therapeutic products,
including a telomerase inhibitor, are subject to rigorous preclinical and
clinical testing and other requirements by the Food and Drug Administration in
the United States and similar health authorities in foreign countries. The
regulatory process, which includes extensive preclinical testing and clinical
trials of each product in order to establish its safety and efficacy, is
uncertain, can take many years and requires the expenditure of substantial
resources.

    Data obtained from preclinical and clinical activities is susceptible to
varying interpretations that could delay, limit or prevent regulatory agency
approvals or clearances. In addition, delays or rejections may be encountered
based upon changes in regulatory agency policy during the period of product
development and/or the period of review of any application for regulatory agency
approval or clearance for a product. Delays in obtaining regulatory agency
approvals or clearances could:

        - significantly harm the marketing of any products that we or our
          collaborative partners develop;

        - impose costly procedures upon our activities or the activities of our
          collaborative partners;

        - diminish any competitive advantages that we or our collaborative
          partners may attain; or

        - adversely affect our ability to receive royalties and generate
          revenues and profits.

    Even if we commit the time and resources, both economic and otherwise, that
are necessary, the required regulatory agency approvals or clearances may not be
obtained for any products developed by or in collaboration with us. If
regulatory agency approval or clearance for a new product is obtained, this
approval or clearance may entail limitations on the indicated uses for which it
may be marketed that could limit the potential market for the product.
Furthermore, approved products and their manufacturers are subject to continual
review, and discovery of previously unknown problems with a product or its
manufacturer may result in restrictions on the product or manufacturer,
including withdrawal of the product from the market. Failure to comply with
regulatory requirements can result in severe civil and criminal penalties,
including but not limited to:

        - recall or seizure of products;

        - injunction against manufacture, distribution, sales and marketing; and

        - criminal prosecution.

    The imposition of any of these penalties could significantly impair our
business.



                                      12.
<PAGE>   14

TO BE SUCCESSFUL, OUR PRODUCTS MUST BE ACCEPTED BY THE HEALTH CARE COMMUNITY
THAT CAN BE VERY SLOW TO ADOPT OR UNRECEPTIVE TO NEW TECHNOLOGIES AND PRODUCTS

    We cannot assure you that any products successfully developed by us or by
our collaborative partners, if approved for marketing, will achieve market
acceptance since physicians, patients or the medical community in general may
decide not to accept and utilize these products. The products that we are
attempting to develop may represent substantial departures from established
treatment methods and will compete with a number of traditional drugs and
therapies manufactured and marketed by major pharmaceutical companies. The
degree of market acceptance of any of our developed products will depend on a
number of factors, including:

        - our establishment and demonstration to the medical community of the
          clinical efficacy and safety of our product candidates;

        - our ability to create products that are superior to alternatives
          currently on the market;

        - our ability to establish in the medical community the potential
          advantage of our treatments over alternative treatment methods; and

        - reimbursement policies of government and third-party payors.

    If the health care community does not accept our products for any of the
foregoing reasons, our ability to generate revenues will be significantly
impaired.

THE REIMBURSEMENT STATUS OF NEWLY-APPROVED HEALTH CARE PRODUCTS IS UNCERTAIN AND
FAILURE TO OBTAIN REIMBURSEMENT APPROVAL COULD SEVERELY LIMIT THE USE OF OUR
PRODUCTS

    Significant uncertainty exists as to the reimbursement status of newly
approved health care products, including pharmaceuticals. If we fail to generate
adequate third party reimbursement for the users of our potential products and
treatments, then we may be unable to maintain price levels sufficient to realize
an appropriate return on our investment in product development.

    In both domestic and foreign markets, sales of our products, if any, will
depend in part on the availability of reimbursement from third-party payors,
examples of which include:

        - government health administration authorities;

        - private health insurers;

        - health maintenance organizations; and

        - pharmacy benefit management companies.

    Both federal and state governments in the United States and foreign
governments continue to propose and pass legislation designed to contain or
reduce the cost of health care through various means. Legislation and
regulations affecting the pricing of pharmaceuticals and other medical products
may change or be adopted before any of our potential products are approved for
marketing. Cost control initiatives could decrease the price that we receive for
any product we may develop in the future. In addition, third-party payors are
increasingly challenging the price and cost-effectiveness of medical products
and services and any of our potential products and treatments may ultimately not
be considered cost effective by these third parties. Any of these initiatives or
developments could negatively impact our business.

OUR ACTIVITIES INVOLVE HAZARDOUS MATERIALS AND IMPROPER HANDLING OF THESE
MATERIALS BY OUR EMPLOYEES OR AGENTS COULD EXPOSE US TO SIGNIFICANT FINANCIAL
PENALTIES

    Our research and development activities involve the controlled use of
hazardous materials, chemicals and various radioactive compounds. As a
consequence, we are subject to numerous environmental and safety laws and
regulations. We may be required to incur significant costs to comply with
current or future environmental laws and regulations and may be adversely
affected by the cost of compliance with these laws and regulations. Although we
believe that our safety procedures for using, handling, storing and disposing of
hazardous materials comply with the standards prescribed by state and federal
regulations, the risk of accidental contamination or injury from these materials
cannot be eliminated. In the event of an accident of this nature, our use of
these materials could be



                                      13.
<PAGE>   15

curtailed by state or federal authorities and we could be held liable for any
resulting damages. Should either of these contingencies arise, our business
could be materially and adversely affected.

WE MAY NOT BE ABLE TO OBTAIN OR MAINTAIN SUFFICIENT INSURANCE ON COMMERCIALLY
REASONABLE TERMS OR WITH ADEQUATE COVERAGE AGAINST POTENTIAL LIABILITIES IN
ORDER TO PROTECT OURSELVES AGAINST PRODUCT LIABILITY CLAIMS

    Although we believe that we do not currently have any exposure to product
liability claims, our future business will expose us to potential product
liability risks that are inherent in the testing, manufacturing and marketing of
human therapeutic and diagnostic products. We currently have no clinical trial
liability insurance and we may not be able to obtain and maintain this type of
insurance for any of our clinical trials. In addition, we may not be able to
obtain or maintain product liability insurance in the future on acceptable terms
or with adequate coverage against potential liabilities.

THE SUBSTANTIAL NUMBER OF SHARES THAT WILL BE ELIGIBLE FOR SALE IN THE NEAR
FUTURE MAY ADVERSELY AFFECT THE MARKET PRICE FOR OUR COMMON STOCK AND MAY RESULT
IN SIGNIFICANT DILUTION TO OUR CURRENT STOCKHOLDERS

    Sales of a substantial number of shares of our common stock in the public
market could significantly and negatively affect the market price for our common
stock. As of October 25, 1999, we had outstanding approximately 16,788,293
shares of common stock. As of October 25, 1999, we also had reserved 4,946,196
shares of common stock for issuance upon exercise of outstanding warrants and
options that we issued to our employees and other entities.

    In addition, the conversion of outstanding debentures and the exercise of
outstanding warrants would result in our issuance of a minimum of 4,369,512
additional shares of common stock in the aggregate. This number of shares could
prove to be significantly greater, and you would be increasingly diluted, in the
event that the conversion or exercise prices are reduced because we:

        - have a rights offering, or a similar offering of securities to all
          investors, at less than the conversion or exercise price per share
          respectively; or

        - issue common stock or securities convertible into common stock, other
          than under our stock plans or in connection with a strategic joint
          venture, at a price less than the conversion price per share.

    Current holders of our common stock will also be immediately and
substantially diluted to the extent that the weighted average conversion and
exercise price of any of the above-described convertible and exercisable
securities is less than the price of our common stock on the date holders of
these securities convert or exercise their convertible or exercisable
securities.

    In connection with the acquisition of Roslin Bio-Med, we issued 2,100,000
shares of our common stock. We are contractually required to register these
shares for resale within 120 days following May 3, 1999. Of these shares 860,000
shares are held in escrow. Subject to claims against the shares held in escrow,
545,000 of these shares will be released from escrow to the former Roslin
Bio-Med shareholders in November 1999, and the remaining 315,000 shares will be
released from escrow to the former Roslin Bio-Med shareholders in May 2000.

    Pursuant to a professional services agreement, we have also agreed to issue
and register for resale an additional 75,000 shares of our common stock.
Further, in connection with a registration rights agreement with the holders of
Series C debentures and warrants, we have agreed to register for resale an
aggregate of 2,899,390 shares of our common stock issuable upon conversion of
Series C debentures and exercise of Series C warrants, subject to adjustment
under certain circumstances. We anticipate this registration will occur in the
first quarter of 2000. The registration of all the shares described above will
cause them to be saleable in the public markets at the time of and following
registration, and could cause downward pressure on the market price of our
common stock. Additionally, one of our current strategic partners and
stockholders, Pharmacia & Upjohn, has contractually agreed not to sell the
696,787 shares of common stock that it holds until April 2000, at which time
these shares will be eligible for sale and freely transferable in the public
market.



                                      14.
<PAGE>   16

COMPLIANCE WITH CERTAIN PROVISIONS OF OUR OUTSTANDING DEBENTURES ARE SUBJECT TO
OBTAINING APPROVAL OF OUR STOCKHOLDERS, WHICH IS OUTSIDE OUR CONTROL; FAILURE TO
OBTAIN SUCH APPROVALS COULD REQUIRE US TO REDEEM THE DEBENTURES

    Currently, we do not have a sufficient number of authorized shares of common
stock to fulfill our reserve commitments under our Series C debentures and
warrants. An increase in authorized capital would require the approval of our
stockholders to amend our Certificate of Incorporation. We cannot assure you
that we can obtain such approval. Our failure to do so prior to March 31, 2000
would be an event of default under our Series C debentures and would require us
to redeem the remaining debentures at a 15% premium to their principal balance
at such time. In addition, under the rules of the Nasdaq Stock Market, we may
not issue shares upon conversion of the Series A, B and C debentures in an
aggregate amount greater than 19.99 percent of the number of shares outstanding
prior to the issuance of the debentures without the prior approval of our
stockholders. If, as a result of an adjustment in the conversion price of any of
the debentures, we would be required to issue shares of our common stock in
excess of such limitation and have not obtained stockholder approval to do so,
we would be required to redeem the remaining debentures at a 15% premium to
their principal balance at such time. As of the date of this prospectus,
approximately $20.5 million aggregate principal amount of debentures is
outstanding including $12.5 million of Series C debentures. Redemption of a
significant amount of debentures could deplete our cash reserves significantly.

OUR STOCK PRICE HAS HISTORICALLY BEEN VERY VOLATILE, WHICH MAY MAKE IT MORE
DIFFICULT FOR YOU TO RESELL SHARES WHEN YOU WANT AT PRICES YOU FIND ATTRACTIVE

    Stock prices and trading volumes for many biopharmaceutical companies
fluctuate widely for a number of reasons, including some reasons which may be
unrelated to their businesses or results of operations. This market volatility,
as well as general domestic or international economic, market and political
conditions, could materially and adversely affect the market price of our common
stock and your return on your investment.

    Historically, our stock price has been extremely volatile. Between January
1998 and September 1999, our stock price traded as high as $24.50 per share and
as low as $3.50 per share. The significant market price fluctuations of our
common stock are due to a variety of factors, including:

        - depth of the market for the common stock;

        - the experimental nature of our prospective products;

        - fluctuations in our operating results;

        - market conditions relating to the biopharmaceutical and pharmaceutical
          industries;

        - any announcements of technological innovations, new commercial
          products or clinical progress or lack thereof by us, our collaborative
          partners or our competitors; or

        - announcements concerning regulatory developments, developments with
          respect to proprietary rights and our collaborations.

    In addition, the stock market is subject to other factors outside our
control that can cause extreme price and volume fluctuations. Securities class
action litigation has often been brought against companies, including many
biotechnology companies, which then experience volatility in the market price of
their securities. Litigation brought against us could result in substantial
costs and a diversion of management's attention and resources, which could
adversely affect our business.

OUR UNDESIGNATED PREFERRED STOCK MAY INHIBIT POTENTIAL ACQUISITION BIDS; THIS
MAY ADVERSELY AFFECT THE MARKET PRICE FOR OUR COMMON STOCK AND THE VOTING RIGHTS
OF THE HOLDERS OF COMMON STOCK

    Our certificate of incorporation provides our Board of Directors with the
authority to issue up to 3,000,000 shares of undesignated preferred stock and to
determine the rights, preferences, privileges and restrictions of these shares
without further vote or action by the stockholders. In March 1998, we designated
and issued 15,000 shares as series A preferred stock, all of which have since
been converted into common stock or redeemed. As of the date of this prospectus,
the Board of Directors still has authority to designate and issue up to
2,985,000 shares of preferred stock. 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. The issuance of shares
of preferred stock may



                                      15.
<PAGE>   17

delay or prevent a change in control transaction without further action by our
stockholders. As a result, the market price of our common stock may be adversely
affected. The issuance of preferred stock may also result in the loss of voting
control by others.

PROVISIONS IN OUR CHARTER AND BYLAWS, AND PROVISIONS OF DELAWARE LAW, MAY
INHIBIT POTENTIAL ACQUISITION BIDS FOR US, WHICH MAY PREVENT HOLDERS OF OUR
COMMON STOCK FROM BENEFITING FROM WHAT THEY BELIEVE MAY BE THE POSITIVE ASPECTS
OF ACQUISITIONS AND TAKEOVERS

    In addition to the undesignated preferred stock, provisions of our charter
documents and bylaws may make it substantially more difficult for a third party
to acquire control of us and may prevent changes in our management, including
provisions that:

        - prevent stockholders from taking actions by written consent;

        - divide the board of directors into separate classes with terms of
          office that are structured to prevent all of the directors from being
          elected in any one year; and

        - set forth procedures for nominating directors and submitting proposals
          for consideration at stockholders' meetings.

        Provisions of Delaware law may also inhibit potential acquisition bids
    for us or prevent us from engaging in business combinations.

    Either collectively or individually, these provisions may prevent holders of
our common stock from benefiting from what they may believe are the positive
aspects of acquisitions and takeovers, including the potential realization of a
higher rate of return on their investment from these types of transactions.

YEAR 2000 PROBLEMS COULD AFFECT OUR DAY-TO-DAY OPERATIONS AND CAUSE SIGNIFICANT
ECONOMIC LIABILITIES

    Potential year 2000 problems are the result of computer programs being
written using two digits rather than four to define the applicable year. Any of
our computer programs or laboratory equipment that have time-sensitive software
may recognize a date using "00" as the year 1900 rather than the year 2000. This
could result in a system failure or miscalculations causing disruptions in
operations, including, among other things, a temporary inability to:

        - process transactions;

        - send checks;

        - perform research and development activities; or

        - engage in similar normal business activities.

    Based on a recent assessment, we have determined that we will be required to
modify or replace portions of our software so that our computer systems will
function properly with respect to dates in the year 2000 and beyond. These
software programs include our accounting package and voicemail system. We
presently believe that with modifications to existing software and conversions
to new software, potential year 2000 problems will not pose significant
operational problems for our computer systems. However, if these modifications
and conversions are not made, or are not completed timely, potential year 2000
problems could have a significant and negative impact on our operations.

    We are completing formal communications with all of our significant
suppliers, service providers and corporate partners to determine the extent to
which our interface systems and other operations are vulnerable to those third
parties' failure to remediate their own year 2000 issues. Our total year 2000
project cost and estimated time to complete includes the estimated costs and
time associated with the impact of third party year 2000 issues and is based on
presently available information. However, we cannot assure you that the systems
of other companies on which our systems rely will be upgraded or converted and
will not have an adverse effect on our systems. Such suppliers, service
providers and corporate partners include our payroll service provider, local
financial institutions and website maintenance organization.



                                      16.
<PAGE>   18

    The total cost of our year 2000 project is estimated at $200,000 and is
being funded through current cash holdings. Of the total project cost,
approximately $100,000 is attributable to the purchase of new software and
equipment, which will be capitalized. The remaining $100,000, which will be
expensed as incurred, is not expected to have a material effect on our results
of operations. To date, we have incurred approximately $175,000 ($85,000
capitalized for new systems and $90,000 expensed), related to the assessment of,
and preliminary efforts on, our year 2000 project.

    The costs of the project and the date on which we believe we will complete
the year 2000 modifications are based on management's best estimates, which were
derived utilizing numerous assumptions of future events, including the continued
availability of certain resources, third party modification plans and other
factors. However, we cannot assure you that these estimates will prove to be
accurate, and actual results could differ materially from those anticipated.
Specific factors that might cause such material differences include, but are not
limited to, the availability and cost of personnel trained in this area, the
ability to locate and correct all relevant computer codes and similar
uncertainties.

    Although we do not believe that we will incur any material costs or
experience material disruptions in our business associated with preparing our
internal systems for the year 2000, we cannot assure you that we will not
experience serious unanticipated negative consequences and/or material costs
caused by undetected errors or defects in the technology used in our internal
systems, which are composed of third party software and third party hardware
that contains embedded software. The most reasonably likely worst case scenarios
could include: (i) corruption of data contained in our internal information
systems, (ii) hardware failure, and (iii) the failure of infrastructure services
provided by government agencies and other third parties, such as electricity,
phone service, water, transport and Internet services.


       YOU SHOULD NOT RELY ON FORWARD-LOOKING STATEMENTS BECAUSE THEY ARE
                              INHERENTLY UNCERTAIN

    This prospectus contains forward-looking statements that involve risks and
uncertainties. You should not rely on these forward-looking statements. We use
words such as "anticipates," believes," "plans," "expects," "future," "intends"
and similar expressions to identify forward-looking statements. These statements
appear throughout the prospectus and are statements regarding our intent,
belief, or current expectations, primarily with respect to our operations and
related industry developments. You should not place undue reliance on these
forward-looking statements, which apply only as of the date of this prospectus.
Our actual results could differ materially from those anticipated in these
forward-looking statements for many reasons, including the risks faced by us and
described in the preceding pages and elsewhere in this prospectus.


                       WHERE CAN YOU FIND MORE INFORMATION

    This prospectus is part of a registration statement on Form S-3 that we
filed with the Securities and Exchange Commission, or the "Commission." Some
information in the registration statement has been omitted from this prospectus
in accordance with the Commission rules. We file annual, quarterly and special
reports, proxy statements and other information with the Commission. You can
read and copy the registration statement as well as reports, proxy statements
and other information we have filed with the Commission at the public reference
room maintained by the Commission at 450 Fifth Street, NW, Washington, D.C.
20549, and at the following Regional Offices of the Commission: Seven World
Trade Center, New York, New York 10048, and Northwest Atrium Center, 500 West
Madison Street, Chicago, Illinois 60661. You can call the Commission at
1-800-732-0330 for further information about the public reference room. We are
also required to file electronic versions of these documents with the
Commission, which may be accessed through the Commission's World Wide Web site
at http://www.sec.gov. Our common stock is quoted on The Nasdaq National Market.
Reports, proxy and information statements and other information concerning our
company may be inspected at The Nasdaq Stock Market at 1735 K Street, NW,
Washington, D.C. 20006.

    The Commission allows us to "incorporate by reference" the information we
have previously filed with them, which means we can disclose important
information by referring you to those documents. All information that we have
incorporated by reference is available to you in accordance with the above
paragraph. Information that we file with the Commission subsequent to the date
of this prospectus will automatically update and supersede this



                                      17.
<PAGE>   19

information. We incorporate by reference the documents listed below and any
future filings made with the Commission under Sections 13(a), 13(c), 14 or 15(d)
of the Securities Exchange Act of 1934 (the "Exchange Act"), until the selling
stockholder has sold all the shares.

    The following documents filed with the Commission are incorporated by
reference in this prospectus:

1.  Our Annual Report on Form 10-K for the year ended December 31, 1998 (File
    No. 0-20859).

2.  Our Quarterly Reports on Form 10-Q for the quarters ended March 31, 1999 and
    June 30, 1999 (File No. 0-20859)

3.  Our Current Report on Form 8-K, filed with the Commission on May 4, 1999
    (File No. 0-20859).

4.  Our Current Report on Form 8-K, filed with the Commission on May 18, 1999
    and amended on May 21, 1999 and June 29, 1999 (File No. 0-20859).

5.  Our Current Report on Form 8-K, filed with the Commission on October 5, 1999
    (File No. 0-20859).

6.  The description of our common stock set forth in our registration statement
    on Form 8-A, filed with the Commission on June 13, 1996 (File No. 0-20859).

    We will furnish without charge to you, on written or oral request, a copy of
any or all of the documents incorporated by reference, including exhibits to
these documents. You should direct any requests for documents to David L.
Greenwood, Chief Financial Officer, Geron Corporation, 230 Constitution Drive,
Menlo Park, California 94025, telephone: (650) 473-7700.



                                      18.
<PAGE>   20

                                USE OF PROCEEDS

    The proceeds from the sale of the common stock offered pursuant to this
prospectus are solely for the account of the selling stockholders. We will not
receive any proceeds from the sale of these shares of common stock.



                                      19.
<PAGE>   21

                              SELLING STOCKHOLDERS

    On May 3, 1999, in connection with the acquisition of Roslin Bio-Med
Limited, we entered into a sale and purchase agreement with the stockholders of
Roslin Bio-Med, pursuant to which we issued to them 2,100,000 shares of our
common stock. Each of the selling stockholders is a former shareholder of Roslin
Bio-Med. Messrs. Best and Bigg are also employees of Geron Bio-Med Limited, the
successor entity to Roslin Bio-Med and a subsidiary of Geron. In addition, we
are involved in a research collaboration effort with the Roslin Institute.

    The following table sets forth information known to us with respect to
beneficial ownership of our common stock as of the date of this prospectus by
the selling stockholders. The number of shares set forth in the table represents
an estimate of the number of shares of common stock to be offered by the selling
stockholders and only includes the number of shares of common stock already
issued.

<TABLE>
<CAPTION>
                                 SHARES                          SHARES BENEFICIALLY
                              BENEFICIALLY                     OWNED AFTER OFFERING(1)
                             OWNED PRIOR TO     SHARES BEING   -----------------------
NAME                            OFFERING           OFFERED       NUMBER     PERCENT
- --------------------------   --------------     ------------     ------     -------
<S>                          <C>                <C>              <C>        <C>
Simon Best                      157,092(2)         149,800          --          *

Ian Kent                         99,800             99,800          --          *

Ian Wilmut                       82,800             82,800          --          *

John Brown                       44,300             44,300          --          *

Ian Biggs                        30,800             30,800          --          *

John Clark                       52,500             52,500          --          *

Roslin Institute                400,000            400,000          --          *

3i Group plc                   1,240,000         1,240,000          --          *
</TABLE>

 *  less than one percent of our common stock

(1) Assumes the sale of all shares.

(2) Includes 7,292 shares issuable upon the exercise of options held by Mr. Best
    that are exercisable within 60 days of the date of this table.


                                      20.
<PAGE>   22

                              PLAN OF DISTRIBUTION

    Shares of common stock offered by this prospectus may be offered and sold
from time to time by the selling stockholders or by donees, pledges, transferees
or other successors in interest. The selling stockholders will act independently
of us in making decisions with respect to the timing, manner and size of each
sale. The selling stockholders may sell shares on the Nasdaq National Market, or
in private sales at negotiated prices, directly or through a broker. The selling
stockholders and any underwriters, dealers or agents who participate in the
distribution of the shares may be deemed to be "underwriters" under the
Securities Act. Any discount, commission or concession received by these persons
might be deemed to be an underwriting discount or commission under the
Securities Act. Further, we have agreed to indemnify the selling stockholders
against liabilities arising under the Securities Act as it relates to
information contained or required to be contained in this prospectus.

    The selling stockholders will pay selling commissions or brokerage fees, if
any, with respect to the sale of the common stock offered by this prospectus in
amounts customary for this type of transaction. The selling stockholders will
also pay all applicable transfer taxes and fees for its legal counsel incurred
in connection with the sale of shares.

    From time to time, the selling stockholders may transfer, pledge, donate or
assign its shares of common stock to lenders or others and each of such persons
will be deemed to be a "selling stockholder" for purposes of this prospectus.
The number of shares of common stock beneficially owned by the selling
stockholders will decrease as and when it takes such actions. The plan of
distribution for the selling stockholders' shares of common stock sold under
this prospectus will otherwise remain unchanged, except that the transferees,
pledgees, donees or other successors will be selling stockholders hereunder.

    The selling stockholders will be subject to the prospectus delivery
requirements of the Securities Act. Geron has informed the selling stockholders
that the anti-manipulative provisions of Regulation M under the Exchange Act may
apply to its sales in the markets.

    The selling stockholders also may resell all or a portion of their shares in
open market transactions in reliance upon Rule 144 under the Securities Act,
provided they meet the criteria and conforms to the requirements of such Rule.

    We have agreed to maintain the effectiveness of this registration statement
until the earlier of the sale of all the shares offered by this prospectus or
the date that each holder of shares can sell all of the shares it holds in any
three-month period in compliance with Rule 144 promulgated under the Securities
Act, but in no event after two years following the date of this prospectus. The
selling stockholders may sell all, some or none of the shares offered by this
prospectus.


                                      21.
<PAGE>   23

                                  LEGAL MATTERS

    The validity of the shares of common stock offered hereby will be passed
upon by Cooley Godward LLP.


                                     EXPERTS

    Ernst & Young LLP, independent auditors, have audited the consolidated
financial statements included in our Annual Report on Form 10-K for the three
years ended December 31, 1998, as set forth in their report which is
incorporated in this prospectus by reference. Our consolidated financial
statements are incorporated by reference in reliance upon Ernst & Young LLP's
report given on their authority as experts in accounting and auditing.

    The audited financial statements and schedules of Roslin Bio-Med Limited,
incorporated by reference in this prospectus and elsewhere in the registration
statement, have been audited by Arthur Andersen, independent public accountants,
as indicated in their report dated April 15, 1999, and are included herein in
reliance upon the authority of said firm as experts in giving said report.



                                      22.









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