As filed with the Securities and Exchange Commission on March 20, 2001
                                                    Registration No. 333-39716
================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                             ----------------------

                         POST-EFFECTIVE AMENDMENT NO. 1
                                       TO
                                    FORM S-8

                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933
                             ----------------------

                               CELGENE CORPORATION
             (Exact name of registrant as specified in its charter)


                 Delaware                              22-2711928
(State or other jurisdiction of            (I.R.S. Employer Identification No.)
 incorporation or organization)

                               7 Powder Horn Drive
                            Warren, New Jersey 07059
                                 (732) 271-1001
               (Address of principal executive offices) (Zip code)

                -------------------------------------------------
                Celgene Corporation 1998 Long-Term Incentive Plan
                -------------------------------------------------

              John W. Jackson                          Copies to:
            Celgene Corporation                  Robert A. Cantone, Esq.
            7 Powder Horn Drive                    Proskauer Rose LLP
         Warren, New Jersey 07059                    1585 Broadway
              (732) 271-1001                 New York, New York 10036-8299
    (Name, address, including zip code,              (212) 969-3000
      and telephone number, including
     area code, of agent for service)


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


================================================================================





Explanatory Note:

The Reoffer Prospectus set forth below and filed as part of this Post-Effective
Amendment No. 1 to the Registration Statement has been prepared in accordance
with the requirements of Part I of Form S-3 under the Securities Act of 1933, as
amended, and in accordance with Section C of the General Instructions to Form
S-8. The Reoffer Prospectus may be used for reofferings and resales of common
stock by the Selling Stockholders as identified on page 12 of the Reoffer
Prospectus, who are Affiliates of the Registrant (as defined in Rule 501(b) of
Regulation D of the Security Act of 1933). The Selling Stockholders will acquire
the shares of common stock upon exercise of options granted to them through the
Registrant's 1998 Long-Term Incentive Plan.





                                        2





Information   contained  herein  is  subject  to  completion  or  amendment.   A
registration  statement  relating  to these  securities  has been filed with the
Securities  and Exchange  Commission.  These  securities may not be sold nor may
offers to buy be accepted prior to the time the registration  statement  becomes
effective.  This  prospectus  shall  not  constitute  an  offer  to  sell or the
solicitation of an offer to buy nor shall there be any sale of these  securities
in any State in which such offer,  solicitation  or sale would be unlawful prior
to registration or qualification under the securities laws of any such State.








                               CELGENE CORPORATION

                               REOFFER PROSPECTUS

                                2,298,500 SHARES

                                  COMMON STOCK
                           (PAR VALUE $0.01 PER SHARE)

                      FOR AFFILIATES OF CELGENE CORPORATION


This  prospectus has been prepared for use in connection  with proposed sales of
up to 2,298,500  shares (the  "Securities") of common stock, par value $0.01 per
share of Celgene Corporation,  which may be made from time to time by or for the
account  of  certain  selling  stockholders  listed  on page  12  (the  "Selling
Stockholders").  We will receive no part of the proceeds of this  offering.  The
Selling  Stockholders  will acquire the shares of common stock upon  exercise of
options  granted to them  pursuant to the  Celgene  Corporation  1998  Long-Term
Incentive  Plan  (the  "1998  Plan").  We will  bear  the  cost of  filing  this
prospectus and each Selling Stockholder will bear the cost of selling its shares
of common stock.

Our common stock is traded on the NASDAQ National Market under the symbol
"CELG." The last reported sale price on March 15, 2001 was $21.5625 per share.

The common stock may be sold in transactions in the NASDAQ National Market at
market prices then prevailing, in negotiated transactions or otherwise. See
"Plan of Distribution."

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

                     This offering involves material risks.
                     See "Risk Factors" beginning on page 4.

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

     Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or determined if this
prospectus is truthful or complete. Any representation to the contrary is a
criminal offense.

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


                 The date of this prospectus is March 20, 2001.






                                        1





                               PROSPECTUS SUMMARY

You should read the following summary together with the more detailed
information, including the consolidated financial statements and the notes to
the consolidated financial statements and other information, incorporated herein
by reference to this prospectus.

                                   THE COMPANY

     We are a Delaware corporation incorporated in 1986, and are an independent
biopharmaceutical company engaged primarily in the discovery, development and
commercialization of orally administered, small molecule drugs for the treatment
of cancer and immunological diseases via gene regulation. The key mechanisms of
action for our drugs are modulation of the overproduction of tumor necrosis
factor alpha ("TNF(alpha)"), modulation  of intra-cellular  signaling  pathways,
and inhibition of angiogenesis. We had total revenues of $84.2 million in 2000.


     The Food and Drug Administration ("FDA") approved our first commercialized
product, THALOMID (thalidomide), for sale in the United States in July 1998. The
approved indication for THALOMID is for the treatment of acute cutaneous
manifestations of moderate to severe erythema nodosum leprosum ("ENL") and as
maintenance therapy for prevention and suppression of cutaneous manifestation
recurrences. ENL is an inflammatory complication of leprosy. We sell this
product in the United States through our 98 person sales and commercialization
organization.

     Our pipeline of new drugs is highlighted by four classes of orally
administered therapeutic agents: ImmunoModulatory Drugs ("IMiDs"), Selective
Cytokine Inhibitory Drugs ("SelCIDs"), Selective Estrogen Receptor Modulators
("SERMS") and cJun N-terminal kinase ("JNK") inhibitors. The IMiD class is based
on the activity of THALOMID in modulating the overproduction of TNF(alpha) and
inhibiting angiogenesis. In preclinical studies, our IMiDs have demonstrated a
higher level of activity than thalidomide. In animal models, these compounds did
not cause birth defects or sedation. As announced in February 2000, two IMiDs
were well-tolerated in healthy human volunteers of Phase I trials. Two Phase
I/II clinical studies of the lead ImiDs in multiple myeloma were initiated in
2000 at the Dana-Farber Cancer Institute and the University of Arkansas Cancer
Research Center.

     The second class of compounds, SelCIDs, is designed to modulate TNF(alpha)
by selectively inhibiting phosphodiesterase ("PDE") 4, a key cell-signaling
enzyme. Our SelCIDs are targeted to control inflammation without broad
suppression of the immune system. Our lead SelCID compound, CDC 801, was safe
and well tolerated in human Phase I trials. Common side effects of known PDE 4
inhibitors such as nausea or vomiting did not occur. CDC 801 is currently being
tested in a Phase II trial for Crohn's disease and the results are expected in
2001. A Phase I trial was initiated for the second-generation SelCID compound,
CDC 998, which is significantly more potent than CDC 801.

     The SERMs are a class of drugs designed to mimic the positive effects of
estrogen by inhibiting bone loss in postmenopausal women, while avoiding some of
estrogen's adverse effects such as increasing risk of breast and uterine cancer.
We intend to file an IND for the next generation SERMs as an anti-cancer agent
in 2001.

                                       2




     The fourth class of compounds are the JNK inhibitors. The JNK pathway
controls the expression of specific sets of genes involved in cancer and
inflammation. Drugs that inhibit JNK activation are expected to selectively
block the over-activation of inducible genes and not affect normal cellular
functions. We anticipate initiating a Phase I clinical trial for the lead JNK
inhibitor in 2002.

     Our chiral chemistry program develops chirally pure versions of existing
compounds for both pharmaceutical and agrochemical markets, including
d-methylphenidate ("d-MPH"), our chirally pure version of Ritalin(R), for the
treatment of attention deficit disorder and attention deficit hyperactivity
disorder. In April 2000, we announced that we had granted Novartis Pharma AG an
exclusive worldwide license (except Canada) for the development and marketing of
d-MPH in return for substantial milestone payments and royalties on d-MPH and
all products in the Ritalin family of drugs. We have retained the rights to
develop d-MPH for cancer-associated disorders.

     Our principal executive offices are located at 7 Powder Horn Drive, Warren,
New Jersey 07059, and our telephone number is (732) 271-1001. Additional
information regarding us is set forth in our Annual Report on Form 10-K for the
fiscal year ended December 31, 2000 (which is incorporated herein by reference).


                                        3





                                  RISK FACTORS

     You should carefully consider the following risk factors, as well as the
other information contained in this prospectus or incorporated herein by
reference in this prospectus, before purchasing any of our common stock.


If we are unsuccessful in developing and commercializing our products, our
business, financial condition and results of operations could be materially
adversely affected.

     Many of our products and processes are in the early or mid-stages of
development and will require the commitment of substantial resources, extensive
research, development, preclinical testing, clinical trials, manufacturing
scale-up and regulatory approval prior to being ready for sale. We have not yet
sold any of our products, other than THALOMID. All of our other products will
require further development, clinical testing and regulatory approvals, and
there can be no assurance that commercially viable products will result from
these efforts, If any of our products, even if developed and approved, cannot be
successfully commercialized, our business, financial condition and results of
operations could be materially adversely affected.

During the next several years, we will be very dependent on the commercial
success of THALOMID.

     At our present level of operations, we may not be able to attain
profitability if physicians prescribe THALOMID only for those who are diagnosed
with ENL. Under current regulations of the FDA we are precluded from promoting
THALOMID outside this approved use. The market for the use of THALOMID in
patients suffering from ENL is relatively small. We have initiated clinical
studies to examine whether or not THALOMID is effective and safe when used to
treat disorders other than ENL, but we do not know whether these studies will in
fact demonstrate safety and efficacy, or if they do, whether we will succeed in
receiving regulatory approval to market THALOMID for additional indications. If
the results of these studies are negative, or if adverse experiences are
reported in these clinical studies or otherwise in connection with the use of
THALOMID by patients, this could undermine physician and patient comfort with
the product, could limit the commercial success of the product and could even
impact the acceptance of THALOMID in the ENL market. FDA regulations restrict
our ability to communicate the results of additional clinical studies to
patients and physicians without first obtaining approval from the FDA to expand
the authorized uses for this product.

If our products are not accepted by the market, our business, financial
condition and results of operations could be materially adversely affected.

     There can be no assurance that those of our products that receive
regulatory approval, including THALOMID, or those products for which no
regulatory approval is required, will achieve market acceptance. A number of
factors render the degree of market acceptance of our products uncertain,
including the extent to which we can demonstrate the products' efficacy, safety
and advantages, if any, over competing products, as well as the reimbursement
policies of third party payors, such as government and private insurance plans.
Failure of our products to achieve market acceptance would have a material
adverse effect on our business, financial condition and results of operations.

We face a risk of product liability claims and may not be able to obtain
insurance.

     We may be subject to product liability or other claims based on allegations
that the use of our technology or products has resulted in adverse effects,
whether by participants in our clinical trials or by


                                        4





patients using our products. Thalidomide, when used by pregnant women, has
resulted in serious birth defects. Therefore, necessary and strict precautions
must be taken by physicians prescribing the drug to women with childbearing
potential, and there can be no assurance that such precautions will be observed
in all cases or, if observed, will be effective. Use of thalidomide has also
been associated, in a limited number of cases, with other side effects,
including nerve damage. Although we have product liability insurance that we
believe is appropriate, there can be no assurance that we will be able to obtain
additional coverage if required, or that such coverage will be adequate to
protect us in the event claims are asserted against us. Our obligation to defend
against or pay any product liability or other claim may have a material adverse
effect on our business, financial condition and results of operations.

We have a history of operating losses and an accumulated deficit and may need to
seek additional funding.

     We have sustained losses in each year since our incorporation in 1986. We
sustained net losses applicable to common stockholders of $16.3 million and
$30.5 million for the years ended December 31, 2000 and 1999. We had an
accumulated deficit of $220.5 million at December 31, 2000. We expect to make
substantial expenditures to further develop and commercialize our products. We
expect that our rate of spending will accelerate as the result of increased
clinical trial costs and expenses associated with regulatory approval and
commercialization of products now in development.

We may experience significant fluctuations in our quarterly operating results.

     We have historically experienced, and expect to continue for the
foreseeable future to experience, significant fluctuations in our quarterly
operating results. These fluctuations are due to a number of factors, many of
which are outside our control, and may result in volatility of our stock price.
Future operating results will depend on many factors, including:

           o     demand for our products;

           o     regulatory approvals for our products;

           o     the timing of the introduction and market acceptance of new
                 products by us or competing companies;

           o     the timing of certain research and development milestones; and

           o     our ability to control our costs.

We have no manufacturing capabilities and we are dependent on one supplier for
the raw material and one manufacturer for the formulation and encapsulation of
THALOMID.

     We currently have no experience in, or our own facilities for,
manufacturing any products on a commercial scale. Currently, we obtain all of
our bulk drug material for THALOMID from a single supplier


                                        5





and rely on a single manufacturer to formulate and encapsulate THALOMID. The FDA
requires that all suppliers of pharmaceutical bulk material and all
manufacturers of pharmaceuticals for sale in or from the United States achieve
and maintain compliance with the FDA's current Good Manufacturing Practice, or
cGMP, regulations and guidelines. If the operations of the sole supplier or the
sole manufacturer were to become unavailable for any reason, the required FDA
review and approval of the operations of a new supplier or new manufacturer
could cause a delay in the manufacture of THALOMID which could have a material
adverse effect on our business, financial condition and results of operations.
We intend to continue to utilize outside manufacturers if and when needed to
produce our other products on a commercial scale. If our outside manufacturers
do not meet our requirements for quality, quantity or timeliness, or do not
achieve and maintain compliance with all applicable regulations, our business,
financial condition and results of operations could be materially adversely
affected.

We have limited marketing and distribution capabilities.

     Although we have a 98-person sales and commercialization group to sell
THALOMID, we may be required to seek a corporate partner to provide marketing
services with respect to our other products. Any delay in developing these
resources could have a material adverse impact on our results of operations. We
have contracted with a speciality distributor to distribute THALOMID. Failure of
this specialty distributor to perform its obligations could have a material
adverse effect on our business, financial condition and results of operations.

We are dependent on collaborations and licenses with third parties.

     Our ability to fully commercialize our products, if developed, may depend
to some extent upon our entering into joint ventures or other arrangements with
established pharmaceutical companies with the requisite experience and financial
and other resources to obtain regulatory approvals and to manufacture and market
such products. Accordingly, our success may depend, in part, upon the subsequent
success of such third parties in performing preclinical and clinical trials,
obtaining the requisite regulatory approvals, scaling up manufacturing,
successfully commercializing the licensed product candidates and otherwise
performing their obligations to us. We cannot assure you that:

           o     we will be able to enter into joint ventures or other
                 arrangements on acceptable terms, if at all;

           o     our joint ventures or other arrangements will be successful;

           o     our joint ventures or other arrangements will lead to the
                 successful development and commercialization of any products;

           o     we will be able to obtain or  maintain  proprietary  rights or
                 licenses to any technology or products developed in connection
                 with our joint ventures or other arrangements; or

           o     we  will  be  able  to  preserve  the  confidentiality  of any
                 proprietary rights or information developed in connection with
                 our joint ventures or other arrangements.

The hazardous materials we use in our research and development could result in
significant liabilities which could exceed our insurance coverage and financial
resources.



                                        6





     We use some hazardous materials in our research and development activities.
While we believe we are currently in substantial compliance with the federal,
state and local laws and regulations governing the use of these materials, we
cannot assure you that accidental injury or contamination will not occur. Any
such accident or contamination could result in substantial liabilities, which
could exceed our insurance coverage and financial resources. Additionally, we
cannot assure you that the cost of compliance with environmental and safety laws
and regulations will not increase in the future.

The pharmaceutical and agrochemical industries are subject to extensive
government regulation and there is no assurance of regulatory approval.

     The preclinical development, clinical trials, manufacturing, marketing and
labeling of pharmaceuticals are all subject to extensive regulation by numerous
governmental authorities and agencies in the United States and other countries.
There can be no assurance that we will be able to obtain the necessary approvals
required to market our products in any of these markets. The testing, marketing
and manufacturing of our products will require regulatory approval, including
approval from the FDA and, in some cases, from the U.S. Environmental Protection
Agency, or the EPA, and the U.S. Department of Agriculture, or the USDA, or
governmental authorities outside of the United States that perform roles similar
to those of the FDA and EPA. Certain of our pharmaceutical products in
development also fall under the Controlled Substances Act of 1970, or the CSA,
which requires authorization by the U.S. Drug Enforcement Agency, or the DEA, of
the U.S. Department of Justice in order to handle and distribute these products.
It is not possible to predict how long the approval processes of the FDA, EPA,
DEA or any other applicable federal, state or foreign regulatory authority or
agency for any of our products will take or whether any such approvals
ultimately will be granted. Positive results in preclinical testing and/or early
phases of clinical studies are no assurance of success in later phases of the
approval process. Risks associated with the regulatory approval process include:

          o    in general, preclinical tests and clinical trials can take many
               years, and require the expenditure of substantial resources, and
               the data obtained from these tests and trails can be susceptible
               to varying interpretation that could delay, limit or prevent
               regulatory approval;

          o    delays or rejections may be encountered during any stage of the
               regulatory process based upon the failure of the clinical or
               other data to demonstrate compliance with, or upon the failure of
               the product to meet, a regulatory agency's requirements for
               safety, efficacy and quality or, in the case of a product seeking
               an orphan drug indication, because another designee received
               approval first;

          o    requirements for approval may become more stringent due to
               changes in regulatory agency policy, or the adoption of new
               regulations or legislation;

          o    the scope of any regulatory approval, when obtained, may
               significantly limit the indicated uses for which a product may be
               marketed;

          o    approved drugs and agrochemicals, as well as their manufacturers,
               are subject to continuing and on-going review, and discovery of
               previously unknown problems with these products may result in
               restrictions on their manufacture, sale or use or in their
               withdrawal from the market; and



                                        7





          o    regulatory authorities and agencies may promulgate additional
               regulations restricting the sale of our existing and proposed
               products.

     Once a product receives marketing clearance, we cannot guarantee that the
FDA will permit us to market those products for broader or different
applications, or that it will grant us clearance with respect to separate
product applications which represent extensions of our basic technology, or that
existing clearances will not be withdrawn or modified in a significant manner.
In addition, it is possible that the FDA will promulgate additional regulations
restricting the sale of our present or proposed products.

     Labeling and promotional activities are subject to scrutiny by the FDA and
state regulatory agencies and, in some circumstances, by the Federal Trade
Commission. FDA enforcement policy prohibits the marketing of approved products
for unapproved, or off-label, uses. These regulations, and the FDA's
interpretation of them, may impair our ability to effectively market THALOMID or
other products which gain marketing clearance. The FDA actively enforces
regulations prohibiting promotion of off-label uses and the promotion of
products for which marketing clearance has not been obtained. Failure to comply
with these requirements can result in regulatory enforcement action by the FDA.
The FDA is aware that physicians prescribe THALOMID for off-label uses, and on
April 21, 2000 we received an FDA Warning Letter regarding off-label promotions.
We have responded to the FDA and believes it has taken all actions necessary to
insure that THALOMID is properly and safely commercialized. FDA approval of
THALOMID requires that we distribute it under the rigid standards of our
S.T.E.P.S.(TM) program in order to maintain approval.

     Delays in obtaining, or the failure to obtain and maintain, necessary
approvals from the FDA, EPA, DEA or other applicable regulatory authorities or
agencies for our proprietary products or regulatory enforcement actions by FDA
concerning our marketing practices would have a material adverse effect on our
business, financial condition and results of operations.

We may not be able to protect our intellectual property.

     Our success will depend, in part, on our ability to obtain and enforce
patents, protect trade secrets, obtain licenses to technology owned by third
parties, when necessary, and conduct our business without infringing upon the
proprietary rights of others. The patent positions of pharmaceutical firms,
including ours, can be uncertain and involve complex legal and factual
questions. In addition, the coverage sought in a patent application may not be
obtained or may be significantly reduced before the patent is issued.
Consequently, we do not know whether any of our pending applications, or any
pending application we have licensed-in from third parties, will result in the
issuance of patents or, if any patents are issued, whether they will provide
significant proprietary protection or commercial advantage. Since, under the
current patent laws, patent applications in the United States are maintained in
secrecy until patents issue, and since publications of discoveries in the
scientific and patent literature often lag behind actual discoveries, we cannot
be certain that we were, or that the third parties from whom we have licensed
patents or patent applications were, the first to make the inventions covered by
the patents and patent applications in which we have rights, or that such
patents and patent applications were the first to be filed on such inventions.
In the event that a third party has also filed a patent application for any of
the inventions described in our patents or patent applications, or those we have
licensed-in, we could become involved in an interference proceeding declared by
the United States Patent and Trademark Office to determine priority of
invention. Such an interference could result in the loss of a United States
patent or loss of any opportunity to secure United States patent protection for
that invention. Even if the eventual outcome is favorable to us, such
interference proceedings could result in substantial cost to


                                        8





us. Moreover, different countries have different procedures for obtaining
patents, and patents issued in different countries provide different degrees of
protection against the use of a patented invention by others. There can be no
assurance, therefore, that the issuance to us or our licensor, in a given
country, of a patent covering an invention will be followed by the issuance, in
other countries, of patents covering the same invention, or that any judicial
interpretation of the validity, enforceability or scope of the claims in a
patent issued in one country will be similar to the interpretation given to the
corresponding patent issued in another country. Furthermore, even if our
patents, or those we have licensed are found valid and enforceable, there can be
no assurance that competitors will not be able to design around such patents and
compete with us using the resulting alternative technology. If any of our issued
or licensed patents are infringed, we cannot guarantee that we will be
successful in enforcing our intellectual property rights. Moreover we cannot
assure you that we can successfully defend against any patent infringement suit
that may be brought against us by a third party. Patent infringement lawsuits in
the pharmaceutical and biotechnology industries can be complex, lengthy and
costly to both parties. An adverse outcome in such a litigation could cause us
to lose exclusivity relating to the subject matter delineated by such patent
claims and may have a material adverse effect on our business. If a third party
is found to have rights covering products or processes used by us, we could be
forced to cease using these products or processes, subject to significant
liabilities to such third party and/or required to license technologies from
such third party. Further, we rely upon unpatented proprietary and trade secret
technology that we try to protect, in part, by confidentiality agreements with
our collaborative partners, employees, consultants, outside scientific
collaborators, sponsored researchers and other advisors. We cannot assure you
that these agreements will not be breached or that we would have adequate
remedies for any such breach. We cannot assure you that, despite precautions
taken by us, others have not and will not obtain access to our proprietary
technology or that such technology will not be found to be non-proprietary or
not a trade secret. Our right to practice the inventions claimed in some patents
which relate to THALOMID arises under licenses granted to us by others,
including The Rockefeller University and EntreMed, Inc. While we believe these
agreements to be valid and enforceable, we cannot assure you that our rights
under these agreements will continue or that disputes concerning these
agreements will not arise. In addition, certain of the grants contained in the
licenses granted to us depend upon the validity and enforceability of other
agreements to which we are not a party.

The pharmaceutical and agrochemical industries are highly competitive and
subject to rapid and significant technological change.

     The pharmaceutical and agrochemical industries in which we operate are
highly competitive and subject to rapid and significant technological change.
Our present and potential competitors include major chemical and pharmaceutical
companies, as well as specialized pharmaceutical firms. Most of these companies
have considerably greater financial, technical and marketing resources than us.
We also experience competition from universities and other research institutions
and, in some instances, we compete with others in acquiring technology from
these sources. The pharmaceutical and agrochemical industries have undergone,
and are expected to continue to undergo, rapid and significant technological
change, and we expect competition to intensify as technical advances in each
field are made and become more widely known. The development of products or
processes with significant advantages over those that we are seeking to develop
could have a material adverse effect on our business, financial condition and
results of operations.




                                        9





Sales of our products are dependent on third-party reimbursement.

     Sales of our products will depend, in part, on the extent to which the
costs of our products will be paid by health maintenance, managed care, pharmacy
benefit and similar health care management organizations, or reimbursed by
government health administration authorities, private health coverage insurers
and other third-party payors. These health care management organizations and
third-party payors are increasingly challenging the prices charged for medical
products and services. Additionally, the containment of health care costs has
become a priority of federal and state governments, and the prices of drugs have
been targeted in this effort. We cannot assure you that our products will be
considered cost effective by payors, that reimbursement will be available or, if
available, that the level of reimbursement will be sufficient to allow us to
sell our products on a profitable basis.

The price of our common stock has experienced substantial volatility and may
continue to do so in the future.

     There has been significant volatility in the market prices for publicly
traded shares of pharmaceutical companies, including ours. In 2000, the price of
our common stock fluctuated from a high of $74.25 to a low of $18.9167 (as
adjusted for a three-for-one stock split in April 2000). On March 14, 2001, our
common stock closed at a price of $21.8125. The price of our common stock may
not remain at or exceed current levels. The following factors may have an
adverse impact on the market price of our common stock:

          o    announcements of technical or product developments by us or our
               competitors;

          o    market conditions for pharmaceutical and biotechnology stocks;

          o    market conditions generally;

          o    governmental regulation;

          o    healthcare legislation;

          o    public announcements regarding medical advances in the treatment
               of the disease states that we are targeting;

          o    patent or proprietary rights developments;

          o    changes in third-party reimbursement policies for our products;
               or

          o    fluctuations in our operating results.

The number of shares of our common stock eligible for future sale could
adversely affect the market price of our common stock.

     Future sales of substantial amounts of our common stock could adversely
affect the market price of our common stock. As of February 15, 2001, there were
outstanding stock options for 7,821,206 shares of common stock, of which
3,446,261 were currently exercisable, and warrants outstanding that are
exercisable for 1,076,690 shares of common stock. These amounts include
outstanding options and warrants of Signal Pharmaceuticals, Inc. ("Signal")
which we assumed as part of a merger (the "Merger") with Signal on August 31,
2000 and which were converted into outstanding options and warrants of our
common stock pursuant to an exchange ratio. In addition, as of February 15,
2001, the 9.0% convertible notes issued on July 6, 1999 can be converted into
1,578,876 shares of common stock. Upon issuance or conversion, all of these
shares of common stock will be freely tradable.

                                        10







We may not realize the benefits of the combined businesses, operations and
personnel as a result of the Merger, which could diminish the expected benefits
of the Merger.

     Achieving the expected benefits of the Merger will depend in large part on
the successful integration of the combined businesses, operations and personnel
in a timely and efficient manner. We must integrate the information systems,
product development, administration and other organizations of the combined
company and the geographical distance between our facilities in Warren, New
Jersey, and Signal's facilities in San Diego, California. This may be difficult
and unpredictable because of possible cultural conflicts and different opinions
on technical, operational and other integration decisions. We must also
integrate the employees of the combined company. The operations, management and
personnel of the combined company may not be compatible, and we may also
experience the loss of key personnel for that reason.

        The diversion of management attention and any difficulties or delays
encountered in the transition and integration process following the Merger could
have a material adverse effect on the conbined company's business, financial
condition and operating results.

        We  expect to incur  costs  from  integrating  Signal's  operations  and
personnel. These costs may be substantial and may include costs for:

o  employee redeployment or severance; and

o  conversion of information systems.

        We cannot assure you that we will be successful in these integration
efforts or that we will realize the expected benefits of the Merger.

Our shareholder rights plan and certain charter and by-law provisions may deter
a third party from acquiring us.

     Our board of directors has adopted a shareholder rights plan, the purpose
of which is to protect stockholders against unsolicited attempts to acquire
control of us that do not offer a fair price to all of our stockholders. The
rights plan may have the effect of dissuading a potential acquirer from making
an offer for our common stock at a price that represents a premium to the then
current trading price.

     Our board of directors has the authority to issue, at any time, without
further stockholder approval, up to 5,000,000 shares of preferred stock, and to
determine the price, rights, privileges and preferences of those shares. Any
issuance of preferred stock could discourage a third party from acquiring a
majority of our outstanding voting stock. Additionally, our board of directors
has adopted certain amendments to our by-laws intended to strengthen the board's
position in the event of a hostile takeover attempt.

     Furthermore, we are subject to the provisions of Section 203 of the
Delaware General Corporation Law, an anti-takeover law, which may also dissuade
a potential inquiror of our common stock.



                                       11





                                 USE OF PROCEEDS

     The shares of common stock being offered hereby are for the account of the
Selling Stockholders. Accordingly, we will not receive any of the proceeds from
the sale of the shares being offered hereby. See "Selling Stockholders."


                              SELLING STOCKHOLDERS

     The shares of common stock to which this Reoffer  Prospectus relates may be
reoffered and sold from time to time by Selling  Stockholders who are Affiliates
(as defined in Rule 501(b) of Regulation D of the Securities  Act of 1933).  The
Selling  Stockholders  will acquire the shares of common stock upon  exercise of
options  granted to them pursuant to the 1998 Plan.  The table below  identifies
each Selling  Stockholder,  the  relationship  to the Company and the respective
number of shares of common stock beneficially owned by each Selling  Stockholder
as of March 20, 2001.



Selling Stockholder       Relationship                         Number of Shares
- -------------------       ------------                         ----------------

John W. Jackson           Chairman of the Board and            1,210,000 1
                          Chief Executive Officer

Sol J. Barer, Ph.D.       Director, President                    515,000 2
                          and Chief Operating Officer

Robert J. Hugin           Chief Financial Officer                573,500 3
                          and Senior Vice President


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

1 Represents 1,210,000 shares of common stock issuable upon exercise of Celgene
                     options granted pursuant to the 1998 Plan.

2 Represents 515,000 shares of common stock issuable upon exercise of Celgene
                     options granted pursuant to the 1998 Plan.

3 Represents 573,500 shares of common stock issuable upon exercise of Celgene
                     options granted pursuant to the 1998 Plan.



                                       12





                              PLAN OF DISTRIBUTION

     The common stock covered by this prospectus may be offered and sold from
time to time by the Selling Stockholders, including in one or more of the
following transactions:

          o    on the NASDAQ National Market;

          o    in transactions other than the NASDAQ National Market;

          o    in connection with short sales;

          o    by pledge to secure debts and other obligations;

          o    in connection with the writing of options, in hedge transactions,
               and in settlement of other transactions in standardized or
               over-the-counter options;

          o    in a combination of any of the above transactions; or

          o    pursuant to Rule 144, assuming the availability of an exemption
               from registration.

     The Selling Stockholders may sell their shares at market prices prevailing
at the time of sale, at prices related to prevailing market prices, at
negotiated prices, or at fixed prices.

     Broker-dealers that are used to sell shares will either receive discounts
or commissions from the Selling Stockholders, or will receive commissions from
the purchasers for whom they acted as agents.

     We have agreed with the Selling Stockholders to customary indemnification
obligations with respect to the sale of the common stock by use of this
prospectus.


                                       13





                          DESCRIPTION OF CAPITAL STOCK

     We have filed a registration statement with the SEC registering and
describing the common stock. For further information on us and the common stock,
you should refer to our registration statement on Form 8-A as set forth under
"Incorporation by Reference."


                                  LEGAL MATTERS

     Proskauer Rose LLP, New York, New York, has passed on the validity of the
shares.

                                     EXPERTS

     The consolidated  financial  statements and schedule of Celgene Corporation
and  subsidiaries as of December 31, 2000 and 1999, and for each of the years in
the three-year period ended December 31, 2000, incorporated by reference in this
prospectus and registration statement have been audited by KPMG LLP, independent
certified  public  accountants,  as  set  forth  in  their  report  thereon  and
incorporated by reference herein which report, as to the years 1999 and 1998, is
based in part on the report of Ernst & Young LLP, independent auditors, which is
incorporated by reference  herein.  The  consolidated  financial  statements and
schedule  referred  to above are  incorporated  by  reference  herein and in the
registration  statement in reliance  upon such reports given on the authority of
said firms as experts in accounting and auditing.

                       WHERE YOU CAN FIND MORE INFORMATION

     We file reports with the SEC on a regular basis that contain financial
information and results of operations. You may read or copy any document that we
file with the SEC at the SEC's Public Reference Room at 450 Fifth Street, N.W.,
Washington, D.C. 20549 and 7 World Trade Center, Suite 1300, New York, New York
10048. You may obtain information about the Public Reference Room by calling the
SEC for more information at 1-800-SEC-0330. Our SEC filings are also available
at the SEC's web site at http://www.sec.gov.

                           INCORPORATION BY REFERENCE

     The SEC allows us to "incorporate by reference" the information we file
with them, which means that we can disclose important information to you by
referring you to those documents. The information incorporated by reference is
considered to be part of this prospectus, and information that we file later
with the SEC will automatically update and supersede this information. We
incorporate by reference the documents listed below and any future filings that
we will make with the SEC under Sections 13(a), 13(c), 14 or 15(d) of the
Securities Exchange Act of 1934.

          1.   Annual Report on Form 10-K for the fiscal year ended December 31,
2000;


                                       14





          2.   Proxy Statement for 2000 Annual Meeting of Stockholders filed
May 5, 2000; and

          3.   The description of the common stock set forth in the
registration statement on Form 8-A, File No. 0-16132, including any
amendments or reports filed for the purpose of updating such description.

     You may request a copy of these filings, at no cost, by writing or
telephoning our Secretary at the following address:

               Celgene Corporation
               7 Powder Horn Drive
               Warren, NJ 07059
               (732) 271-1001

     This Reoffer Prospectus is part of a registration statement we filed with
the SEC. You should rely only on the information or representations provided in
this Reoffer Prospectus. We have authorized no one to provide you with different
information. We are not making an offer of these securities in any state where
the offer is not permitted. You should not assume that the information in this
Reoffer Prospectus is accurate as of any date other than the date on the front
of the document.


                                       15





                                     PART II

               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

     Item 3. Incorporation of Documents by Reference.
     ------  ---------------------------------------

     The following documents filed with the Securities and Exchange Commission
(the "Commission") by Celgene Corporation, a Delaware corporation (the
"Corporation" or the "Registrant"), are incorporated herein by reference:

     1.   Annual Report on Form 10-K for the fiscal year ended December 31,
2000;

     2.   Proxy Statement for 2000 Annual Meeting of Stockholders filed May 5,
2000;

     3.   The description of the common stock set forth in the registration
statement on Form 8-A, File No. 0-16132, including any amendments or reports
filed for the purpose of updating such description; and

     4.  All documents subsequently filed by the Corporation pursuant to
Sections 13(a), 13(c), 14, or 15(d) of the Securities Exchange Act of 1934,
prior to the filing of a post-effective amendment which indicates that all
securities offered have been sold or which deregisters all securities then
remaining unsold, shall be deemed to be incorporated by reference in this
Registration Statement and to be part hereof from the date of filing such
documents.

     Any statement in a document incorporated or deemed to be incorporated by
reference herein shall be deemed to be modified or superseded for the purposes
of this Registration Statement to the extent that a statement contained herein
or in any other subsequently filed document which also is or is deemed to be
incorporated by reference herein modifies or supersedes such statement. Any
statement so modified or superseded shall not be deemed, except as so modified
or superseded, to constitute a part of this Registration Statement.

     Item 4. Description of Securities.
     ------  -------------------------

     Not applicable.



                                      II-1





     Item 5. Interests of Named Experts and Counsel.
     ------  --------------------------------------

     Not applicable.

     Item 6. Indemnification of Directors and Officers.
     ------  -----------------------------------------

     Article EIGHTH of the Corporation's Certificate of Incorporation provides
that the Corporation shall indemnify, to the fullest extent authorized by the
Delaware General Corporation Law, its officers and directors against all
expenses, judgments, fines and amounts paid in settlement incurred in connection
with any civil, criminal, administrative or investigative action, suit or
proceeding. The Certificate of Incorporation also extends indemnification to
those serving at the request of the Corporation as directors, officers,
employees or agents of other enterprises.

     In addition Article TENTH of the Corporation's Certificate of Incorporation
provides that no director of the Corporation shall be liable to the Corporation
or any of its stockholders for monetary damages for breach of fiduciary duty as
a director, except for director's liability (i) for breach of the director's
duty of loyalty to Celgene or its stockholders, (ii) for acts of or omissions of
such director not in good faith or which involve intentional misconduct or a
knowing violation of law, (iii) under Section 174 of the Delaware General
Corporation Law, or (iv) for any transaction from which the director derived an
improper personal benefit.

     Section 145 of the General Corporation Law of the State of Delaware permits
a corporation to indemnify its directors and officers against expenses
(including attorney's fees), judgments, fines and amounts paid in settlements
actually and reasonably incurred by them in connection with any action, suit or
proceeding brought by third parties, if such directors or officers acted in good
faith and in a manner they reasonably believed to be in or not opposed to the
best interests of the corporation and, with respect to any criminal action or
proceeding, had no reason to believe their conduct was unlawful. In a derivative
action, i.e., one by or in the right of the corporation, indemnification may be
made only for expenses actually and reasonably incurred by directors and
officers in connection with the defense or settlement of an action or suit, and
only with respect to a matter as to which they shall have acted in good faith
and in a manner they reasonably believed to be in or not opposed to the best
interest of the corporation, except that no indemnification shall be made if
such person shall have been adjudged liable to the corporation, unless and only
to the extent that the court in which the action or suit was brought shall
determine upon application that the defendant officers or directors are
reasonably entitled to indemnity for such expenses despite such adjudication of
liability.

     Section 102(b)(7) of the General Corporation Law of the State of Delaware
provides that a corporation may eliminate or limit the personal liability of a
director to the corporation or its stockholders for monetary damages for breach
of fiduciary duty as a director, provided that such provision shall not
eliminate or limit the liability of a director (i) for any breach of the
director's duty of loyalty to the corporation or its stockholders, (ii) for acts
or omissions not in good faith or which involve intentional misconduct or a
knowing violation of law, (iii) under Section 174 of the General Corporation Law
of the State of Delaware, or (iv) for any transaction from which the director
derived an improper personal benefit. No such provision shall eliminate or limit
the liability of a director for any act or omission occurring prior to the date
when such provision becomes effective.



                                      II-2





     Pursuant to Section 145 of the General Corporation Law of the State of
Delaware, Celgene maintains directors' and officers' liability insurance
coverage.

     Item 7. Exemption from Registration Claimed.
     ------  -----------------------------------

     Not applicable

     Item 8. Exhibits.
     ------  --------

     5.1     Opinion of Proskauer Rose LLP*

     23.1    Consent of KPMG LLP

     23.2    Consent of Ernst & Young LLP

     23.3    Consent of Proskauer Rose LLP (included in Exhibit 5.1)

     24.1    Power of Attorney *

     99.1    Celgene Corporation 1998 Long-Term Incentive Plan (incorporated by
reference to Exhibit A to the Proxy Statement of the Registrant, filed May 5,
2000).


     *       previously filed

     Item 9. Undertakings.
     ------  ------------

     (a)     The undersigned Registrant hereby undertakes:

             (1)  To file, during any period in which offers or sales are being
made, a post-effective amendment to this registration statement:

                  (i)   To include any prospectus required by Section 10(a)(3)
             of the Securities Act of 1933;

                  (ii)  To reflect in the prospectus any facts or events arising
             after the effective date of the registration statement (or the
             most recent post-effective amendment thereof) which, individually
             or in the aggregate, represent a fundamental change in the
             information set forth in the registration statement.
             Notwithstanding the foregoing, any increase or decrease in the
             volume of securities offered (if the total dollar value of
             securities offered would not exceed that which was registered)
             and any deviation from the low or high end of the estimated
             maximum offering range may be reflected in the form of prospectus
             filed with the Commission pursuant to Rule 424(b) if, in the
             aggregate, the changes in volume and price represent no more than
             20 percent change in the maximum aggregate offering price set
             forth in the "Calculation of Registration Fee" table in the
             effective registration statement;

                  (iii) To include any material information with respect to the
             plan of distribution not previously disclosed in the registration
             statement or any material change to such information in the
             registration statement;



                                      II-3





provided, however, that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply if the
information required to be included in a post-effective amendment by those
paragraphs is contained in periodic reports filed with or furnished to the
Commission by the Registrant pursuant to Section 13 or 15(d) of the Securities
Exchange Act of 1934 that are incorporated by reference in the registration
statement.

             (2)  That, for the purpose of determining any liability under the
     Securities Act of 1933, each such post-effective amendment shall be deemed
     to be a new registration statement relating to the securities offered
     therein, and the offering of such securities at the time shall be deemed to
     be the initial bona fide offering thereof.

             (3)  To remove from registration by means of a post-effective
     amendment any of the securities being registered which remain unsold at the
     termination of the offering.

     (b)     The undersigned Registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act of 1933, each filing of the
Registrant's annual report pursuant to Section 13(a) or Section 15(d) of the
Securities Exchange Act of 1934 that is incorporated by reference in the
registration statement shall be deemed to be a new registration statement
relating to the securities offered therein, and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.

     (c)     Insofar as indemnification for liabilities arising under the
Securities Act of 1933 may be permitted to directors, officers, and controlling
persons of the Registrant pursuant to the foregoing provisions, or otherwise,
the Registrant has been advised that in the opinion of the Securities and
Exchange Commission such indemnification is against public policy as expressed
in the Act and is, therefore, unenforceable. In the event that a claim for
indemnification against such liabilities (other than the payment by the
Registrant of expenses incurred or paid by a director, officer, or controlling
person of the Registrant in the successful defense of any action, suit, or
proceeding) is asserted by such director, officer, or controlling person in
connection with the securities being registered, the Registrant will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Act and will
be governed by the final adjudication of such issue.




                                      II-4





                                   SIGNATURES

     Pursuant to the requirements of the Securities Act of 1933, as amended, the
Registrant certifies that it has reasonable grounds to believe that it meets all
of the requirements for filing on Form S-8 and has duly caused this Registration
Statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Warren, State of New Jersey, on March 20, 2001.

                                   CELGENE CORPORATION

                                    By: /s/ John W. Jackson
                                        ============================
                                            John W. Jackson
                                        Chairman of the Board and
                                        Chief Executive Officer


                        SIGNATURES AND POWER OF ATTORNEY

     Pursuant to the requirements of the Securities Act of 1933, as amended,
this Registration Statement has been signed below by the following persons in
the capacities and on the dates indicated.


Signatures                      Title                         Date
- ----------                      -----                         ----

                                Chairman of the Board and     March 20, 2001
/s/ John W. Jackson             Chief Executive Officer
=========================       (Principal Executive Officer)
John W. Jackson

               *                Director, President           March 20, 2001
- ------------------------------  and Chief Operating Officer
Sol J. Barer, Ph.D.

               *                Chief Financial Officer       March 20, 2001
- ------------------------------  and Senior Vice President
Robert J. Hugin

               *                Director                      March 20, 2001
- ------------------------------
Jack L. Bowman

               *                Director                      March 20, 2001
- ------------------------------
Frank T. Cary

               *                Director                      March 20, 2001
- ------------------------------
Arthur Hull Hayes, Jr., M.D.

               *                Director                      March 20, 2001
- ------------------------------
Gilla Kaplan, Ph.D.

               *                Director                      March 20, 2001
- ------------------------------
Richard C.E. Morgan

               *                Director                      March 20, 2001
- ------------------------------
Walter L. Robb, Ph.D.

               *                Director                      March 20, 2001
- ------------------------------
Lee J. Schroeder
*   By power of Attorney


                                      II-5





                                  EXHIBIT INDEX
                                  -------------


      Exhibit                         Description of Exhibit
      -------                         ----------------------


      5.1                             Opinion of Proskauer Rose LLP*


      23.1                            Consent of KPMG LLP


      23.2                            Consent of Ernst & Young LLP


      23.3                            Consent of Proskauer Rose LLP
                                      (included in Exhibit 5.1)


      24.1                            Power of Attorney*


      99.1                            Celgene Corporation 1998 Long-Term
                                      Incentive Plan (incorporated by reference
                                      to Exhibit A to the Proxy Statement of the
                                      Registrant, filed May 5, 2000).



*     previously filed



                                      II-6