CELGENE CORP /DE/
S-3/A, 1999-10-04
COMMERCIAL PHYSICAL & BIOLOGICAL RESEARCH
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                                                    Registration No. 333--87197

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


                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
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                               AMENDMENT NO. 1 TO
                                    FORM S-3
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933
     -----------------------------------------------------------------------


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



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

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


         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. |_|

                         CALCULATION OF REGISTRATION FEE

                                      Proposed    Proposed Maximum   Amount of
Title of each          Amount to be    Maximum        Maximum       registration
class of Securities     registered    Offering       Aggregate        fee (2)
To  BeRegistered                        Price      Offering Price
                                     Per Share(1)
Common Stock,
par value $.01 per
share               1,632,495 shares    $25.75       $42,036,746      $11,686

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.

1. $9,447  of  the  registration  fee  was  previously  paid  with the filing of
   the registration    statement   on   Form   S-3   on   September   16,  1999.
     -----------------------------------------------------------------------


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

                                1,632,495 SHARES

                                  COMMON STOCK
                           (PAR VALUE $0.01 PER SHARE)


These shares of common stock are being sold by the stockholders listed beginning
on page 11. 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 October 5, 1999.



                                        1

<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  conditions 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  40 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,



                                        5

<PAGE>



proprietary  know-how,  and  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


                                        6

<PAGE>



the   requisite   experience   and  financial  and other  resources   to  obtain
regulatory approval,  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.





                                        7

<PAGE>


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 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,  there is a 9.25%  convertible note
that can be converted to 795,455 shares of common stock,  one 9.00%  convertible
note that can be  converted  to  833,400  shares  of common  stock and one 9.00%
convertible  note that can be converted into 789,474 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>





                              REGISTERING STOCKHOLDERS

         The following table sets forth certain  information  regarding the sale
by the  registering  stockholders  of  1,632,495  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 registering 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  registering
stockholders is c/o Celgene Corporation, 7 Powder Horn Drive, Warren, New Jersey
07059.



<TABLE>

                                             Shares                             Shares
                                          Beneficially           Number of   Beneficially
                                          Owned Prior             Shares     Owned After
   Registering Stockholder                to Offering    %(1)    Offered      Offering     %(1)

<S>                                           <C>         <C>      <C>           <C>        <C>
Warburg Dillon Read LLC(2)                  795,455       4.6     795,455          0         *
Chancellor LGT Private Capital III,         76,846         *       76,846          0         *
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         *
Biovail Laboratories Incorporated (7)       199,688       1.2     199,688          0         *
Celgene Corporation 401(k) Plan (8)           5,000        *        5,000          0         *

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

- - - --------------------
*    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.

(7)  Represents  199,688  shares  of  Celgene  common  stock issued  pursuant to
     Stock Purchase  Agreement  dated June 23, 1998 between  Celgene and Biovail
     Laboratories Incorporated.

(8)  Represents  113,121 shares  of Celgene  common stock  granted by Celgene to
     the Celgene Corporation 401(k) Plan (the "Plan") for sale from time-to-time
     by the trustees of the Plan on behalf of certain employees of Celgene whose
     participation in the Plan has terminated.


                              PLAN OF DISTRIBUTION

         The common  stock  covered by this  prospectus  may be offered and sold
from time to time by the registering  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  registering  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  registering  stockholders,  or will receive
commissions from the purchasers for whom they acted as agents.

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

         Celgene has agreed to keep this prospectus  effective until the earlier
of (i) the date on which all of the  shares of common  stock  registered  hereby
have  been sold and (ii) the date on which  all of the  shares  of common  stock
registered  hereby may be immediately  sold without  registration or other legal
restriction.  Celgene  intends to deregister any of the common stock not sold by
the registering stockholders immediately after the latest date it is required to
keep this prospectus effective for any of the registering stockholders.



                                       12

<PAGE>



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

                                  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 quarter ended March 31, 1999.

         3.  Quarterly Report on Form 10-Q for the quarter ended 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.









                                       13

<PAGE>



         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  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.


                                       14

<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...................................... $11,686
          NASDAQ National Market listing fee........................  17,500
          Legal fees and expenses...................................  10,000
          Accounting fees and expenses..............................   5,000
          Miscellaneous expenses....................................      --

                            Total................................... $44,186


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.



                                      II-2

<PAGE>


(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.

         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 J. 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 October 1, 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        October 1, 1999
- - - --------------------------
John W. Jackson              Chief Executive Officer
                             (Principal Executive Officer)
  /s/ Sol J. Barer           Director                         October 1, 1999
- - - --------------------------
Sol J. Barer
                             Chief Financial Officer          October 1, 1999
  /s/ Robert J. Hugin        (Principal Accounting and
- - - --------------------------
Robert J. Hugin              Financial Officer)
                             Director                         October 1, 1999

- - - --------------------------
Jack L. Bowman



                                      II-4

<PAGE>




  /s/ John W. Jackson           Director                      October 1, 1999
- - - ---------------------------
Frank T. Cary
                                Director                      October 1, 1999
  /s/ John W. Jackson
- - - ---------------------------
Gilla Kaplan
                                Director                      October 1, 1999
  /s/ John W. Jackson
- - - ---------------------------
Arthur Hull Hayes, Jr.
                                Director                      October 1, 1999
  /s/ John W. Jackson
- - - ---------------------------
Richard C. E. Morgan
                                Director                      October 1, 1999
  /s/ John W. Jackson
- - - ---------------------------
Walter L. Robb
                                Director                      October 1, 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


                                                       October 1, 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 1,632,495 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") or have been  issued to the Celgene
Corporation 401(k) Plan (the "Plan") and Biovail  Laboratories  Incorporated and
may be offered for sale for the benefit of the registering 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 (i) 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  and (ii) the  Shares  issued  to the  Celgene
Corporation 401(k) Plan and to Biovail Laboratories  Incorporated have been 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
October 1,1999




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