CELGENE CORP /DE/
S-3, 1999-09-16
COMMERCIAL PHYSICAL & BIOLOGICAL RESEARCH
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                                                         Registration No. 333--
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
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                                    FORM S-3
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
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                              CELGENE CORPORATION
             (Exact name of Registrant as specified in its charter)
    -----------------------------------------------------------------------



        DELAWARE                             8731                     22-2711928
(State or other jurisdiction of  (Primary Standard Industrial   (I.R.S. Employer
 incorporation or organization)   Classification Code Number)Identification No.)

                 7 Powder Horn Drive, Warren, New Jersey 07059
                                 (732) 271-1001
              (Address, including zip code, and telephone number,
       including area code, of Registrant's principal executive offices)
    -----------------------------------------------------------------------


                                JOHN W. JACKSON
               Chairman of the Board and Chief Executive Officer
                              Celgene Corporation
                 7 Powder Horn Drive, Warren, New Jersey 07059
                                 (732) 271-1001
           (Name, address, including zip code, and telephone number,
                   including area code, of agent for service)
    -----------------------------------------------------------------------

                          Copies of Communications to:
                            Robert A. Cantone, Esq.
                               Proskauer Rose LLP
                  1585 Broadway, New York, New York 10036-8299
                                 (212) 969-3000
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     Approximate date of commencement of proposed sale to the public: As soon as
practicable after this Registration  Statement  becomes  effective.

     If the only  securities  being  registered  on this Form are being  offered
pursuant to dividend or interest  investment  plans,  please check the following
box.  |_|

     If any of the securities being registered on this Form are to be offered on
a delayed or continuous  basis  pursuant to Rule 415 under the Securities Act of
1933 check the following box. |X|

     If this Form is filed to  register  additional  securities  for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list  the  Securities  Act  registration  statement  number  of the  earlier
effective registration statement for the same offering. |_|

     If this Form is a  post-effective  amendment  filed pursuant to Rule 462(c)
under the  Securities  Act,  check the following box and list the Securities Act
registration  statement number of the earlier effective  registration  statement
for the same offering. |_|

     If delivery of the  prospectus is expected to be made pursuant to Rule 434,
please check the following box. |_|

<TABLE>

                        CALCULATION OF REGISTRATION FEE
<S>                           <C>              <C>               <C>                <C>
                                              Proposed Maximum  Proposed  Maximum   Amount of
Title of each class of         Amount to be    Offering Price       Aggregate     registration
Securities To Be Registered    registered       Per Share (1)    Offering  Price      fee
Common  Stock,               1,319,686 shares      $25.75          $33,981,915       $9,447
par value $.01 per share
</TABLE>

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

1. Based on the average high and low trading price on the Nasdaq National Market
on September 13, 1999.  Estimated  pursuant to Rule 457 under the Securities Act
of 1933, as amended, solely for the purpose of calculating the registration fee.
    -----------------------------------------------------------------------

The Registrant hereby amends this  registration  statement on such date or dates
as may be necessary to delay its effective date until the Registrant  shall file
a further amendment which specifically  states that this Registration  Statement
shall  thereafter  become  effective  in  accordance  with  Section  8(a) of the
Securities  Act of  1933  or  until  the  Registration  Statement  shall  become
effective on such date as the Commission,  acting pursuant to said Section 8(a),
may determine.
<PAGE>
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

                                1,319,686 SHARES

                                  COMMON STOCK
                           (PAR VALUE $0.01 PER SHARE)

These shares of common stock are being sold by the selling  stockholders  listed
beginning on page __. Celgene Corporation  ("Celgene" or the "Company") will not
receive any proceeds from the sale of these shares.

Celgene's  common stock is traded on the Nasdaq National Market under the symbol
"CELG." The last  reported  sale price on  September  13, 1999 was  $26.3125 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 September __, 1999.
<PAGE>
                               PROSPECTUS SUMMARY

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


                                  THE COMPANY

         We  are  a  specialty   pharmaceutical   company   that   develops  and
commercializes pharmaceutical products for human beings, focusing largely on the
immunology/oncology  market and agrochemicals for crops. The initial therapeutic
focus of our  immunology/oncology  program  is the  development  of:  (i)  small
molecule  pharmaceuticals  that have the potential to selectively regulate Tumor
Necrosis Factor - ("TNF"), a protein whose overproduction has been linked to
many chronic inflammatory and immunological diseases and (ii) the development of
anti-angiogenic pharmaceuticals that can inhibit the growth of new blood vessels
in a growing tumor,  making them potentially  valuable  anti-cancer  agents. Our
lead pharmaceutical is THALOMID(R),  our formulation of thalidomide,  which is a
potent anti-angiogenic agent and a down regulator of TNF.

         On July 16,  1998,  we received  approval  from the U.S.  Food and Drug
Administration  (the "FDA") for THALOMID for the  treatment of erythema  nodosum
leprosum ("ENL"), an inflammatory  complication of leprosy. We are working on an
additional New Drug  Application  ("NDA") to allow us to market THALOMID for the
treatment of certain  cancers and cachexia  (wasting) in patients  with Acquired
Immune Deficiency Syndrome ("AIDS").

         Working  with the FDA,  we have  developed  a  comprehensive  education
program and  distribution  system,  the "System for  Thalidomide  Education  and
Prescribing Safety," or the S.T.E.P.S.(TM) program, which is designed to support
the safe and  appropriate  use of thalidomide  because of the drug's capacity to
cause birth defects. This program has been made a part of the THALOMID label. We
are  also  developing  novel  and  proprietary  thalidomide  analogues,   called
IMiDs(TM)   (Immunomodulatory   Drugs),  as  well  as  a  class  of  proprietary
immunotherapeutic   pharmaceutical   compounds  called  SelCIDs(TM)  ("Selective
Cytokine  Inhibitory  Drugs").   These  two  classes  of  compounds  are  orally
administered  small molecules that suppress  excess TNF  production,  have other
anti-angiogenic  properties  and are  intended  to  treat  chronic  inflammatory
diseases, cancer and other disorders.

         Our core chiral technology is based on biocatalysis, which involves the
identification  and  manipulation  of enzymes to  perform  specialized  chemical
reactions,  such as the production of chirally pure compounds.  Chirality refers
to the property of many  chemical  compounds  to exist in two or more  different
conformations  that are mirror images of each other.  While one conformation may
have  beneficial  effects,  the other may be  inactive  or  produce  undesirable
effects.  Chirally pure compounds contain only one of these  conformations,  and
thus may have attributes superior to those of the racemic mixture.

         We  are   developing   chirally   pure   versions   of   commercialized
pharmaceuticals  to develop  products  having  greater  efficacy  and fewer side
effects than the existing racemic versions.  Our main product is a chirally pure
version  of   dl-methylphenidate   (currently  marketed  under  the  trade  name
Ritalin(R))  for the  treatment  of  Attention  Deficit  Hyperactivity  Disorder
("ADHD"). We initiated its Phase III pivotal trial program in the fourth quarter
of 1998.  We  previously  completed  a Phase I/II trial and  announced  that its
chirally pure version had demonstrated statistically significant efficacy versus
the placebo and preliminary indications of longer duration of action relative to
the racemic version.

                                       2
<PAGE>
         We are working to produce an array of novel, highly potent,  selective,
safe,  orally  administered  drugs  that  have the  potential  to  regulate  the
overproduction of TNF, as well as inhibiting angiogenesis. Overproduction of TNF
has been implicated in symptoms  associated  with certain  chronic  inflammatory
diseases.  Chronic inflammatory and immunological  diseases collectively afflict
millions  of  patients,  and for the most  part are  inadequately  treated  with
existing  therapies.  We are developing two new classes of compounds,  IMiDs and
SelCIDs,  which have been demonstrated in in vitro tests using human cells to be
significantly more active than thalidomide in suppressing TNF production and, in
preclinical tests, have not demonstrated  teratogenicity.  Initially,  the IMiDs
and the SelCIDs are targeted  for use in treating  inflammatory  bowel  disease,
rheumatoid arthritis and oncological applications. Our first SelCID was found to
be well tolerated in two Phase I clinical trials in the United  Kingdom,  and is
entering a pilot study to assess its potential for treating  Crohn's  disease in
the United States.  The United States Patent and Trademark  Office ("U.S.  PTO")
has issued  composition of matter patents to us relating to certain of its novel
IMiDs and SelCIDs.

         We are also employing our biocatalytic  chiral chemistry  technology to
develop  chirally  pure  versions of existing  pharmaceutical  products that may
demonstrate greater efficacy and/or fewer side effects. We filed Investigational
New Drug  applications  ("INDs") in the United  States and Canada for a chirally
pure  version  of  dl-methylphenidate,  which  has  been  used  for  decades  in
formulations  such as  Ritalin(R)  for the  treatment  of ADHD in  children.  We
completed our Phase I/II  clinical  trial of the drug in which our chirally pure
version  demonstrated  statistically  significant  efficacy  versus  placebo and
preliminary  indications  of longer  duration of action  relative to the racemic
version. We have initiated pivotal Phase III trials of that drug.

         Through our  Celgro(TM)  subsidiary,  we are also  applying  our chiral
technology  to the  production  of  chirally  pure  agrochemicals,  in which the
Company's  biocatalytic  process  can add  significant  value  by  substantially
lowering  manufacturing costs and reducing environmental impact. In 1998, Celgro
entered  into  agreements  with two leading  agrochemical  companies  to develop
cost-effective processes for the production of chirally pure versions of certain
products  currently  produced by those firms.  Each agreement  provides that the
customer will fund a research and development  program  conducted by us relating
to the customer's  product,  make milestone payments to us if certain benchmarks
are achieved and pay us a royalty if the program leads to commercial sales.

         We have established a sales and marketing organization to commercialize
THALOMID  and employ  approximately  32 persons in this  capacity.  We intend to
develop and market our own  pharmaceuticals for indications with smaller patient
populations.  We anticipate partnering with larger pharmaceutical companies with
respect to drugs for indications with larger patient populations.  We may create
partnerships  with companies for the  development and  commercialization  of our
chirally pure  pharmaceuticals and agrochemical  products.  We expect that these
arrangements  typically  will  include  milestone  payments,   reimbursement  of
research and development expenses and royalty arrangements.

         We were  incorporated  in Delaware  in 1986.  Our  principal  executive
offices are located at 7 Powder Horn Drive,  Warren,  New Jersey 07059,  and our
telephone and fax numbers are (732) 271-1001 and (732) 805-3931, respectively.


                                       3
<PAGE>
                                  RISK FACTORS

We are  dependent on product  development  and  commercialization  for continued
growth and development.

         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 the pharmaceutical products
under  development  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,  if and when
developed and approved,  cannot be  successfully  commercialized,  our operating
results could be materially adversely affected.

The pharmaceutical  industry is 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 certain cases, from the U.S.
Environmental Protection Agency (the "EPA"), or governmental authorities outside
of the United  States that perform roles similar to those of the FDA and EPA. It
is not  possible  to  predict  how long the  approval  processes  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 this 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 trials  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  approval  process based upon the failure of the clinical or
         other data to demonstrate  compliance  with, or upon the failure of the
         product to meet,  the  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.
         Further, those requirements may become more stringent due to changes in
         regulatory agency policy, or the adoption of new regulations.

      o  Clinical trials may also be delayed due to unanticipated  side effects,
         the  inability  to locate,  recruit and qualify  sufficient  numbers of
         patients,   lack  of  funding,  the  inability  to  locate  or  recruit
         scientists,  the redesign of clinical trial programs,  the inability to
         manufacture or acquire sufficient  quantities of the particular product
         candidate or any other components required for clinical trials, changes
         in focus of the Company's or its  collaborative  partner's  development
         focus, and the disclosure of trial results by competitors.

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

                                       4
<PAGE>
      o  Approved drugs and agrochemicals,  as well as their manufacturers,  are
         subject  to  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.

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

There is no assurance of market acceptance of our products.

         There can be no  assurance  that those of our  products  which  receive
regulatory approval,  including THALOMID, or 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 such products'  efficacy,  safety, and advantages over competing
products,  as well as the reimbursement  policies of third party payors, such as
government and private  insurance plans. In addition,  there can be no assurance
that our Celgro subsidiary will be able to negotiate a licensing  agreement with
any  agrochemical  manufacturer on terms acceptable to us, or at all. Failure of
our products to achieve market  acceptance  would have a material adverse effect
on our business, financial condition, and results of operations.

We are  subject  to  product  liability  risk  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  patients.
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 in force that we believe is appropriate,  there
can be no  assurance  that we will be able  to  obtain  additional  coverage  as
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  claim may have a material  adverse  effect on our  business,
financial condition, and results of operations.

We may  not  be  able  to  obtain  patent  coverage  or  otherwise  protect  our
proprietary technology.

         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  the
proprietary  rights of  others.  The  patent  positions  of  pharmaceutical  and
biotechnology  firms,  including us, can be uncertain and involve  complex legal
and factual questions.  In addition, the coverage sought in a patent application
can be significantly  reduced before the patent is issued.  Consequently,  we do
not know whether any of our pending  applications will result in the issuance of
patents or, if any patents are issued,  whether  they will  provide  significant
proprietary  protection  or commercial  advantage,  or will be  circumvented  by
others. We rely upon unpatented  proprietary and trade secret technology that we
try to protect,  in part, by  confidentiality  agreements with its collaborative
partners, employees,  consultants,  outside scientific collaborators,  sponsored
researchers, and other advisors. There can be no assurance that these agreements
provide meaningful  protection or that they will not be breached,  that we would
have  adequate  remedies  for any  such  breach,  or  that  our  trade  secrets,
proprietary know-how, and

                                       5

<PAGE>
technological advances will not otherwise become known to others. In addition,
there can be no assurance that, despite precautions taken by us, others have not
and will not obtain access to our proprietary technology.

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

         We have sustained losses in each year since our  incorporation in 1986.
We sustained a net loss of  approximately  $25.1 and $25.4 million for the years
ended December 31, 1998 and 1997,  respectively,  and had an accumulated deficit
of  approximately  $144.6  million  at  December  31,  1998.  We  expect to make
substantial  expenditures  to further develop our  immunotherapeutic  and chiral
products,  and,  based on these  expenditures,  it is probable  that losses will
continue for at least the next 12 months . We are  currently  utilizing our cash
resources at a rate of approximately  $1.5 million per month. We expect that our
rate of spending  generally will remain high as the result of increased clinical
trial costs and expenses  associated  with the regulatory  approval  process and
commercialization of products now in development. In order to assure funding for
our future operations,  we will likely seek additional capital resources.  There
can be no assurance,  assuming we successfully  raise  additional funds or enter
into a business  alliance,  that we will achieve  profitability or positive cash
flow.

The  pharmaceutical   industry  is  highly  competitive  and  subject  to  rapid
technological change.

         The pharmaceutical and agrochemical  businesses in which we operate are
highly competitive and subject to rapid and profound  technological  change. Our
present and  potential  competitors  include major  chemical and  pharmaceutical
companies,  as well as specialized  biotechnology firms in the United States and
in other countries. 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 such 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.  There can be no  assurance  that  others  will not  develop  products or
processes with significant advantages over those that we are seeking to develop.
Any such  development  could have a  material  adverse  effect on our  business,
financial condition, and results of operations.

We are  dependent on one supplier  for the raw  material  and  encapsulation  of
THALOMID.

         We obtain  all of our bulk drug  material  for  THALOMID  from a single
source. In addition,  we currently rely on a single  manufacturer to encapsulate
THALOMID.  Because the FDA requires  that all suppliers of  pharmaceutical  bulk
material and all manufacturers of pharmaceuticals  for sale in the United States
achieve  and  maintain  compliance  with the FDA's  current  Good  Manufacturing
Practice  regulations  and  guidelines  ("GMP"),  if the  operations of the sole
supplier or the sole encapsulator were to become unavailable for any reason, the
required  FDA review of the  operations  of a new  supplier or new  encapsulator
could cause a delay in the  manufacture  of THALOMID.  Such a delay 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  proprietary  products,  if
developed,  may  depend to some  extent  upon our  ability  to enter  into joint
ventures or other  arrangements with established  pharmaceutical  companies with
the requisite  experience and financial and other resources to obtain regulatory
approval,

                                       6
<PAGE>
and to  manufacture  and market such  products.  Accordingly,  our success  will
depend, in part, upon the subsequent success of such third parties in performing
preclinical  testing and clinical  trials,  obtaining the  requisite  regulatory
approvals,  scaling up manufacturing,  successfully commercializing the licensed
product candidates and otherwise  performing their obligations.  There can be no
assurance  that  we will be able to  enter  into  acceptable  collaborative  and
licensing  arrangements on acceptable  terms, if at all, that such  arrangements
will be  successful,  that the parties with which we may establish  arrangements
will perform their obligations, or that potential collaborators will not compete
with us by seeking alternative means of developing therapeutics for the diseases
targeted  by  us.  There  can  be no  assurance  that  our  existing  or  future
arrangements  will lead to the  development  of product  candidates or compounds
with  commercial  potential,  that  we  will  be  able  to  obtain  or  maintain
proprietary  rights or licenses for the  proprietary  rights with respect to any
technology or product candidates or compounds developed in connection with these
arrangements,  or that we will be  able to  ensure  the  confidentiality  of any
proprietary rights and information developed in such arrangements or prevent the
public disclosure thereof.

We have no manufacturing capabilities.

         The  manufacture of large  quantities of  pharmaceuticals  is a complex
process,  and all  pharmaceutical  manufacturing  facilities  must  comply  with
applicable  regulations  of the FDA. We currently  have no experience in, or our
own  facilities  for,  manufacturing  any  products on a  commercial  scale.  We
currently  obtain bulk drug material for THALOMID from a third-party and utilize
another  manufacturer  to produce  dosage  form  THALOMID.  We intend to utilize
outside  manufacturers  if and when  needed to produce  our other  products on a
commercial scale.  There can be no assurance that such  manufacturers  will meet
our  requirements  for  quality,   quantity,   or  timeliness,   or  that  these
manufacturers   will  achieve  and  maintain   compliance  with  all  applicable
regulations.

We have limited marketing capabilities.

         We have a sales and marketing  organization to commercialize  THALOMID,
and with respect to certain other products,  we may seek a corporate  partner to
provide  such  services.  Any delay in  developing  these  resources  may have a
material  adverse impact on potential sales. We have contracted with a specialty
distributor to distribute  THALOMID.  Failure of such  specialty  distributor to
properly and  continuously  perform its  obligations  under such agreement could
have a material adverse effect on our business.

Product pricing is uncertain and we are dependent on third-party reimbursement.

         Sales of our  pharmaceutical  products  will  depend,  in part,  on the
extent to which the costs of such 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,  and the prices of  pharmaceutical  and
biotechnology drugs have been targeted in this effort. There can be no assurance
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.

We are dependent on key personnel for our continued growth and development.

         Our success will depend,  in large part,  on our ability to continue to
attract  and  retain  highly  skilled   scientific  and  management   personnel.
Competition for such personnel is intense, and there can be no

                                       7
<PAGE>
assurance that we will be able to attract and retain such persons. The loss of
our executive officers or scientific personnel, or our failure to attract and
retain other highly skilled personnel would have a material adverse effect on
our business, financial condition, and results of operations. We do not maintain
key man life insurance coverage on the lives of any of our officers or key
employees.

Environmental and safety hazards are a risk.

         We use certain  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 such use, there can be
no assurance that accidental  injury or  contamination  will not occur. Any such
accident or contamination could result in substantial  liabilities,  which could
exceed our resources.  Additionally,  there can be no assurance that the cost of
compliance  with  environmental  and  safety  laws and  regulations  will not be
greater than currently expected.

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

         Future sales of  substantial  amounts of common  stock could  adversely
affect the prevailing market price of our common stock. As of December 31, 1998,
there were  outstanding  stock  options for  approximately  2,428,113  shares of
common stock, of which approximately  1,567,534 were currently exercisable,  and
warrants  either  outstanding or issuable upon demand that are  exercisable  for
639,967 shares of common stock. In addition,  the 9.25%  convertible note can be
converted to 795,455 shares of common stock. All shares of common stock referred
to in this paragraph would be freely tradable upon issuance.

We may experience 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. This fluctuation is due to a number of factors, many of which
are outside our control, including the timing of receipt of certain research and
development  payments.  Future  operating  results will depend on many  factors,
including  demand  for our  products,  regulatory  approvals,  the timing of the
introduction and market acceptance of new products by us or competing companies,
our  ability to control  costs and our  ability  to  attract  and retain  highly
qualified scientific and management  personnel.  Such quarterly  fluctuations in
operating results may result in volatility of our stock price.

Our stock price has experienced substantial volatility.

         There has been significant volatility in the market prices for publicly
traded shares of specialty pharmaceuticals companies,  including ours. There can
be no  assurance  that the price of our common  stock  will  remain at or exceed
current  levels.   Factors  such  as   announcements  of  technical  or  product
developments  by  us  or  our  competitors,   market  conditions  for  specialty
pharmaceutical   stocks  in   general,   governmental   regulation,   healthcare
legislation, public announcements regarding medical advances in the treatment of
the  disease  states  that we are  targeting,  or patent or  proprietary  rights
developments  may have a significant  adverse  impact on the market price of our
common stock.


                                       8
<PAGE>
Our  shareholder  rights plan and  certain  charter  and by-law  provisions  may
dissuade a potential acquiror.

         Our board of  directors  has  adopted a  shareholder  rights  plan (the
"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 is not intended to prevent, and should
not prevent, an offer to acquire Celgene at a price and on terms that are in the
best interests of all stockholders,  or a negotiated transaction to sell Celgene
for a purchase  price  determined by our board of directors to be in our and our
stockholders'  best interests,  nor should it have a material  adverse affect on
the ability of a person or group to obtain  representation  on or control of the
board of directors  through a proxy  contest.  Nonetheless,  the Rights Plan may
have the effect of dissuading a potential  acquirer from making an offer for all
the  outstanding  shares of Common Stock at a price that represents a premium to
the then current trading price.

         Moreover,  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.  Such issuance could adversely  affect the holders of common stock,  and
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. The by-law provisions provide:

      o  Only persons who are nominated in accordance  with the  procedures  set
         forth in the by-laws  shall be eligible  for  election as  directors of
         Celgene, except as may be otherwise provided in the by-laws.

      o  Only  business  brought  before  the  annual  meeting  by the  board of
         directors or by a  stockholder  who complies  with the  procedures  set
         forth  in the  by-laws  may  be  transacted  at an  annual  meeting  of
         stockholders.

      o  Only the chairman of the board,  if any, the chief  executive  officer,
         the president,  the secretary,  or a majority of the board of directors
         may call special meetings of our stockholders.

      o  A procedure for the board of directors is established to fix the record
         date whenever stockholder action by written consent is undertaken.

      o  A vote of holders of  two-thirds  of the  outstanding  shares of Common
         Stock is required to amend certain by-law provisions.

Furthermore, Celgene is subject to the provisions of Section 203 of the Delaware
General Corporation Law, an anti-takeover law. In general, the statute prohibits
a publicly held Delaware  corporation from engaging in a "business  combination"
with an "interested  stockholder"  for a period of three years after the date of
the transaction in which the person became an interested stockholder, unless the
business combination is approved in a prescribed manner. For purposes of Section
203, a "business combination" includes a merger, asset sale or other transaction
resulting  in  a  financial  benefit  to  the  interested  stockholder,  and  an
"interested   stockholder"  is  a  person  who,  together  with  affiliates  and
associates,  owns (or  within  three  years  prior,  did own) 15% or more of the
corporation's voting stock.


                                       9
<PAGE>

We have not paid and do not intend to pay dividends on our common stock.

          We have never declared or paid cash dividends on our common stock, and
do not anticipate doing so in the foreseeable future.

The failure  of governmental  agencies and our  vendors and customers to be Year
2000  compliant could cause a material disruption in our business.

          Beginning  in the Year 2000,  the date fields  coded in some  software
products and computer systems will need to accept four digit entries in order to
distinguish  21st century dates from 20th century  dates and, as a result,  many
companies software and computer systems may need to be upgraded or replaced in
order to comply with such "Year 2000" requirements.

          Systems that do not properly recognize such information could generate
erroneous data or cause a system to fail. Significant  uncertainty exists in the
software  industry   concerning  the  potential  effects  associated  with  such
compliance issues.

          Our Chief Information Officer, in conjunction with outside consultants
has  assessed  our  systems  with  regard  to  Year  2000   compliance  and  the
implementation  for Year 2000 compliant  systems is nearing  completion.  During
1998,  we  replaced  all  personal  computers,  with the  exception  of  several
computers connected to laboratory  analytic equipment,  with Year 2000 compliant
machines.  All applications  other than those used in the laboratory  equipment,
are Year 2000  compliant.  We have  completed an  assessment  of the  laboratory
computers and have begun the replacement of non-Year 2000 compliant machines. We
have spent less than $1.0  million on the systems  upgrades to date.  Additional
expenditures  are expected to be less than $500,000.  We use outside  vendors to
produce,  encapsulate,  package,  process orders,  invoice and maintain accounts
receivable   records  for   THALOMID.   We  are  in  the  process  of  receiving
certifications  from such vendors that the systems  utilized are or will be Year
2000  compliant  before the end of 1999.  Based on current  plans and efforts to
date,  we expect that there will be no material  adverse  effect on  operations.
There can be no  assurance,  however,  that all  problems  will be foreseen  and
corrected,  that Year 2000 problems at the Company's vendors,  customers, and at
governmental  agencies  will  not  adversely  affect  us,  or that  no  material
disruption  of our  business  will  occur  as a  result  of Year  2000 problems.
Accordingly,  we are  developing  contingency  plans  to  address  the  possible
occurrence  of Year 2000  problems.  Such plans are expected to be in place well
before the end of 1999.

          The  statements   contained  in  the  foregoing  Year  2000  readiness
disclosure are subject to certain protection under the Year 2000 Information and
Readiness Disclosure Act.

                                       10


<PAGE>


                              SELLING STOCKHOLDERS

         The following table sets forth certain  information  regarding the sale
by the  selling  stockholders  of  1,319,686  shares  of  common  stock  in this
offering.  Except as otherwise noted,  each person named below has an address in
care of our principal executive offices.

         Except as described in this table, none of the selling stockholders has
held any position or office or had a material  relationship  with Celgene or any
of its  affiliates  within  the past three  years  other than as a result of the
ownership  of  Celgene's  common  stock.  The  address  of each  of the  Selling
Stockholders is c/o Celgene Corporation, 7 Powder Horn Drive, Warren, New Jersey
07059.

                                   Shares                       Shares
                                Beneficially       Number of  Beneficially
                                 Owned Prior         Shares    Owned After
   Selling Stockholder           to Offering  %(1) Offered     Offering     %(1)
Warburg Dillon Read LLC(2)         795,455    4.6   795,455        0          *
Chancellor LGT Private Capital      76,846     *     76,846        0          *
III, L.P.(3)
Citiventure 96 Partnership, L.P.(4)296,481    1.7   296,481        0          *
Chancellor LGT Private Capital     145,904     *    145,904        0          *
Offshore Partners II, L.P.(5)
Kelbourne Financial Inc.(6)          5,000     *      5,000        0          *

- --------------------
*    Represents less than 1% of the outstanding shares of common stock.

(1)  Applicable  percentages  of  ownership  are based on  17,129,987  shares of
     common stock  outstanding on September 13, 1999 adjusted as required by the
     rules  promulgated by the Securities and Exchange  Commission  (SEC).  This
     table is  based  upon  information  supplied  by  officers,  directors  and
     principal  stockholders  and  Schedules 13D and 35G (if any) filed with the
     SEC. Unless  otherwise  indicated,  and subject to community  property laws
     where  applicable,  we believe that each of the stockholders  named in this
     table has sole  voting  and  investment  power  with  respect to the shares
     indicated as beneficially  owned.  Any security that any person named above
     has the right to  acquire  within 60 days is deemed to be  outstanding  for
     purposes of calculating the percentage ownership of such person, but is not
     deemed  to  be  outstanding  for  purposes  of  calculating  the  ownership
     percentage of any other person.

(2)  Represents  795,455  shares of common stock  issuable upon  conversion of a
     Celgene Convertible Note, due September 16, 2003.

(3)  Represents  shares  issuable  upon  exercise of warrant to purchase  76,846
     shares of Celgene common stock.

(4)  Represents  shares  issuable upon  exercise of warrant to purchase  296,481
     shares of Celgene common stock.

                                       11
<PAGE>
(5)  Represents  shares  issuable upon  exercise of warrant to purchase  145,904
     shares of Celgene common stock.

(6)  Represents  shares  issuable  upon  exercise of warrant to  purchase  5,000
     shares of Celgene common stock.

                              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.

         The sale of common  stock by the  selling  stockholders  is  subject to
compliance by the selling  stockholders  with certain  contractual  restrictions
with Celgene,  including certain restrictions contained in a registration rights
agreement  between  Celgene  and  the  selling  stockholders.  There  can  be no
assurance  that the  selling  stockholders  will  sell all or any of the  common
stock.

         Celgene has agreed to keep this prospectus effective until such time as
each selling  stockholder  may sell all of their shares of common stock pursuant
to Rule 144 in a single three-month period. Celgene intends to deregister any of
the common  stock not sold by the selling  stockholders  immediately  after that
date.

         Celgene  and  the  selling   stockholders   have  agreed  to  customary
indemnification  obligations with respect to the sale of the common stock by use
of this prospectus.


                                       12
<PAGE>
                                 LEGAL MATTERS

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

                                    EXPERTS

          The  consolidated  financial  statements  of Celgene  Corporation  and
subsidiary  as of December  31, 1998 and 1997,  and for each of the years in the
three-year  period ended December 31, 1998, have been  incorporated by reference
herein and in the  registration  statement  in reliance  upon the report of KPMG
LLP, independent certified public accountants,  incorporated by reference herein
upon the authority of said firm as experts in accounting and auditing.


                      WHERE YOU CAN FIND MORE INFORMATION

         Celgene  files  reports  with the SEC on a regular  basis that  contain
financial  information  and  results  of  operations.  You may  read or copy any
document that Celgene files 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.
Celgene's   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 10K for the fiscal  year ended  December  31,
            1998,  as amended by an Amendment on Form 10-K/A and an Amendment on
            Form 10-K/A-2.

         2. Quarterly Report on Form 10-Q for the period ending March 31, 1999.

         3. Quarterly Report on Form 10-Q for the period ending June 30, 1999.

         4. 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


                                       13
<PAGE>
         This  prospectus is part of a registration  statement we filed with the
SEC. You should rely only on the information or representations provided in this
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 prospectus is
accurate as of any date other than the date on the front of the document.

                                       13
<PAGE>
                                    PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS


Item 14.    Other Expenses of Issuance and Distribution.

         An  estimate  (other  than  the SEC  registration  fee) of the fees and
expenses of issuance and distribution  (other than discounts and commissions) of
the Common Stock offered hereby (all of which will be paid by the Company) is as
follows:


     SEC registration fee...................................... $  9,447
     NASDAQ National Market listing fee........................   17,500
     Legal fees and expenses...................................   10,000
     Accounting fees and expenses..............................       --
     Miscellaneous expenses....................................       --

                       Total................................... $ 36,947


Item 15.     Indemnification of Directors and Officers.

         The General  Corporation Law of the State of Delaware  ("DGCL") permits
Celgene and its  stockholders  to limit  directors'  exposure to  liability  for
certain breaches of the directors' fiduciary duty, either in a suit on behalf of
Celgene or in an action by stockholders of Celgene.

         The Certificate of Incorporation of Celgene (the "Charter")  eliminates
the  liability  of  directors to  stockholders  or Celgene for monetary  damages
arising  out of the  directors'  breach  of their  fiduciary  duty of care.  The
Charter  also   authorizes   Celgene  to  indemnify  its  directors,   officers,
incorporators,  employees,  and agents with respect to certain costs,  expenses,
and amounts incurred in connection with an action, suit, or proceeding by reason
of the fact that such person was serving as a director,  officer,  incorporator,
employee,  or agent of Celgene.  In  addition,  the Charter  permits  Celgene to
provide additional  indemnification  rights to its officers and directors and to
indemnify  them to the  greatest  extent  possible  under the DGCL.  Celgene has
entered into indemnification  agreements with each of its officers and directors
and  intends to enter into  indemnification  agreements  with each of its future
officers and directors. Pursuant to such indemnification agreements, Celgene has
agreed to indemnify  its officers and  directors  against  certain  liabilities,
including  liabilities  arising out of the  offering  made by this  Registration
Statement.

         Celgene maintains a standard form of officers' and directors' liability
insurance  policy  which  provides  coverage to the  officers  and  directors of
Celgene for certain  liabilities,  including certain liabilities which may arise
out of this Registration Statement.


                                      II-1
<PAGE>
Item 16.          Exhibits.

The exhibits  listed in the Exhibit Index as filed as part of this  Registration
Statement.

(a)      Exhibits

Exhibit
Number      Description

5.1--   Opinion of Proskauer Rose LLP.

23.1 -- Consent of KPMG LLP.

23.2--  Consent of Proskauer Rose LLP(incorporated by reference to Exhibit 5.1).

24.1--  Power of Attorney (included in Signature Page).


Item 17.  Undertakings.

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; (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 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) (Section 230.424(b) of this
         chapter)  if,  in the  aggregate,  the  changes  in  volume  and  price
         represent no more than a 20% change in the maximum  aggregate  offering
         price set forth in the  "Calculation of Registration  Fee" table in the
         effective  registration  statement;  and (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;  provided, however, that (i)
         and (ii) do not apply if the  Registration  Statement is on Form S-3 or
         Form  S-8,   and  the   information   required  to  be  included  in  a
         post-effective  amendment  by (i) and  (ii) is  contained  in  periodic
         reports  filed with or furnished to the  Commission  by the  Registrant
         pursuant to Section 13 or Section  15(d) of the  Exchange  Act that are
         incorporated by reference in the Registration Statement.

(2)      That, for the purpose of determining any liability under the Securities
         Act,  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 that 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.

                                      II-2
<PAGE>
         Insofar as indemnification for liabilities arising under the Securities
Act 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 Securities 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  Securities  Act and will be  governed by the final
adjudication of such issue.

         The  undersigned  Registrant  hereby  undertakes  that, for purposes of
determining  any  liability  under  the  Securities  Act,  each  filing  of  the
Registrant's  annual  report  pursuant to Section  13(a) or Section 15(d) of the
Exchange Act 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.

                                      II-3
<PAGE>
                        SIGNATURES AND POWER OF ATTORNEY


         KNOW ALL MEN BY THESE  PRESENTS,  that  each  person  or  entity  whose
signature appears below  constitutes and appoints John W. Jackson,  Sol J. Barer
and Robert Hugin,  and each of them, its true and lawful  attorneys-in-fact  and
agents,  with full power of substitution and  resubstitution,  for it and in its
name, place and stead, in any and all capacities, to sign any and all amendments
to this  Registration  Statement  on Form  S-3 and to file  the  same,  with all
exhibits  thereto,  and  other  documents  in  connection  therewith,  with  the
Securities and Exchange  Commission,  granting unto said  attorneys-in-fact  and
agents,  and each of them,  full power and  authority to do and perform each and
every act and thing  requisite and necessary to be done, as fully to all intents
and purposes as it might or could do in person,  hereby ratifying and confirming
all that  said  attorneys-in-fact  and  agents  or any of them,  or their or his
substitute or substitutes may lawfully do or cause to be done by virtue thereof.

         Pursuant  to the  requirements  of the  Securities  Act  of  1933,  the
Registrant certifies that it has reasonable grounds to believe that it meets all
of the requirements for filing on Form S-3 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 September 16, 1999.

                                              CELGENE CORPORATION


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


Pursuant to the requirements of the Securities Act, this Registration  Statement
has been signed  below by the  persons  whose  signatures  appear  below,  which
persons have signed such Registration Statement in the capacities indicated:



Signature                         Title                          Date
- ---------                         -----                          ----
/s/ John W. Jackson               Chairman of the Board and   September 16, 1999
- -------------------------------   Chief Executive Officer
John W. Jackson                   (Principal Executive Officer)

/s/ Sol J. Barer                  Director                    September 16, 1999
- --------------------------------
Sol J. Barer

/s/ Robert Hugin                  Chief Financial Officer     September 16, 1999
- --------------------------------- (Principal Accounting and
Robert Hugin                      Financial Officer)

- --------------------------------  Director                    September 16, 1999
Jack L. Bowman


                                      II-4
<PAGE>
/s/ Frank T. Cary                 Director                    September 16, 1999
- --------------------------------
Frank T. Cary

/s/ Gilla Kaplan                  Director                    September 16, 1999
- ---------------------------------
Gilla Kaplan

/s/ Arthur Hull Hayes, Jr.        Director                    September 16, 1999
- ---------------------------------
Arthur Hull Hayes, Jr.

/s/ Richard C. E. Morgan          Director                    September 16, 1999
- ---------------------------------
Richard C. E. Morgan

/s/ Walter L. Robb                Director                    September 16, 1999
- ---------------------------------
Walter L. Robb

- --------------------------------- Director                    September 16, 1999
Lee J. Schroeder
                                      II-5
<PAGE>
                               INDEX TO EXHIBITS


5.1 --   Opinion of Proskauer Rose LLP.

23.1 --  Consent of KPMG LLP.

23.2--   Consent of Proskauer Rose LLP(incorporated by reference to Exhibit 5.1)

24.1--   Power of Attorney (included in Signature Page).

                                      II-6
<PAGE>
EXHIBIT 5.1


                               September 16, 1999



Celgene Corporation
7 Powder Horn Drive
Warren, New Jersey  07059

Dear Sirs:

         We are acting as counsel to Celgene Corporation, a Delaware corporation
(the "Company"),  in connection with the registration statement on Form S-3 with
exhibits thereto (the  "Registration  Statement") filed by the Company under the
Securities Act of 1933, as amended,  and the rules and  regulations  promulgated
thereunder,  relating to the  registration of 1,319,686 shares (the "Shares") of
common stock,  par value $.01 per share,  of the Company.  All of the Shares are
issuable upon the exercise of warrants (the  "Warrants") and the conversion of a
convertible  note (the  "Convertible  Note") and may be offered for sale for the
benefit of the selling  stockholders  named in the  Registration  Statement.  We
understand  that the Shares are to be sold from time to time as described in the
section entitled "Plan of Distribution" in the Registration Statement.

         As  such  counsel,  we  have  participated  in the  preparation  of the
Registration  Statement and have reviewed the corporate  minutes relating to the
issuance of the Shares  pursuant to the Plan and have also  examined  and relied
upon  originals  or  copies,   certified  or  otherwise   authenticated  to  our
satisfaction,  of  all  such  corporate  records,  documents,   agreements,  and
instruments relating to the Company, and certificates of public officials and of
representatives of the Company.

         Based  upon,  and  subject to, the  foregoing,  we are of the  opinion,
assuming no change in the  applicable law or pertinent  facts,  that the Shares,
when issued in  accordance  with the terms of the  Warrants  or the  Convertible
Note, as the case may be, will be duly authorized,  validly issued,  fully paid,
and non-assessable.

         We hereby  consent to the filing of this  opinion as Exhibit 5.1 to the
Registration Statement. In giving the foregoing consent, we do not admit that we
are in the category of persons whose consent is required  under Section 7 of the
Securities  Act of  1933,  as  amended,  or the  rules  and  regulations  of the
Securities and Exchange Commission promulgated thereunder.


                                  Very truly yours,


                                  /s/ Proskauer Rose LLP

                                      II-7
<PAGE>
EXHIBIT 23.1


CONSENT OF INDEPENDENT AUDITORS


The Board of Directors Celgene Corporation:

We  consent  to the use of our report  incorporated  by reference  herein and to
the  reference to our firm under the heading "EXPERTS" in the prospectus.


                                            /s/KPMG LLP

Short Hills, New Jersey
September 16,1999
                                      II-8


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