CELGENE CORP /DE/
S-3, 2000-01-19
COMMERCIAL PHYSICAL & BIOLOGICAL RESEARCH
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   AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JANUARY 19, 2000
                                                           REGISTRATION NO. 333-
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549
                                   FORM S-3
                            REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

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

<TABLE>
<CAPTION>

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

</TABLE>

                 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.                     Gerald S. Tanenbaum, Esq.
      Proskauer Rose LLP                         Cahill Gordon & Reindel
  1585  Broadway, New York,                     80 Pine Street, New York,
    New York 10036-8299                                New York 10005
     (212) 969-3000                                   (212) 701-3000

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. [ ]

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
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>

- ------------------------------------------------------------------------------------------------------------
                                                     PROPOSED MAXIMUM   PROPOSED MAXIMUM      AMOUNT OF
TITLE OF EACH CLASS OF         AMOUNT TO BE          OFFERING PRICE     AGGREGATE             REGISTRATION
SECURITIES TO BE REGISTERED    REGISTERED (1)        PER SHARE (2)      OFFERING PRICE        FEES (3)
- ------------------------------------------------------------------------------------------------------------
<S>                            <C>                   <C>                <C>                   <C>
Common Stock,
 par value $.01 per share      2,778,400 shares      $ 62.125           $172,608,100           $45,569
- ------------------------------------------------------------------------------------------------------------

</TABLE>

(1) Includes shares which the  Underwriters  have an option to purchase to cover
    over-allotments, if any.

(2) Based  on  the average high and low trading price of the common stock on the
    Nasdaq  National  Market on January 14, 2000. Estimated pursuant to Rule 457
    under  the  Securities  Act  of  1933, 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>

                             SUBJECT TO COMPLETION
                             DATED JANUARY 19, 2000

PROSPECTUS


2,416,000 Shares


[GRAPHIC OMITTED]


CELGENE CORPORATION

Common Stock

Celgene Corporation is selling 2,000,000 shares of common stock in this offering
and the selling stockholder is selling 416,000 shares.

Our  common  stock is traded on the  Nasdaq  National  Market  under the  symbol
"CELG." On January 18, 2000,  the  reported  last sale price of our common stock
was $63 11/16 per share.

INVESTING  IN  OUR  COMMON STOCK INVOLVES RISKS. SEE "RISK FACTORS" BEGINNING ON
PAGE 6.

NEITHER  THE  SECURITIES  AND  EXCHANGE  COMMISSION  NOR  ANY  STATE  SECURITIES
COMMISSION  HAS  APPROVED  OR DISAPPROVED OF THESE SECURITIES OR PASSED UPON THE
ADEQUACY  OR  ACCURACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS
A CRIMINAL OFFENSE.

<TABLE>
<CAPTION>

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

                   PRICE TO   UNDERWRITING       PROCEEDS TO   PROCEEDS TO THE
                   PUBLIC     DISCOUNTS          CELGENE       SELLING STOCKHOLDER
- ------------------------------------------------------------------------------------
<S>               <C>        <C>                  <C>        <C>

Per Share         $             $                 $              $
- ------------------------------------------------------------------------------------

Total             $             $                 $              $
- ------------------------------------------------------------------------------------

</TABLE>

We have  granted the  underwriters  the right to  purchase  up to an  additional
362,400 shares of our common stock to cover over-allotments.

                              Joint Lead Managers

J.P. MORGAN & CO.                                PRUDENTIAL VECTOR HEALTHCARE
                                                A UNIT OF PRUDENTIAL SECURITIES

                           U.S. BANCORP PIPER JAFFRAY




          , 2000

THE  INFORMATION IN THIS  PROSPECTUS IS NOT COMPLETE AND MAY BE CHANGED.  WE MAY
NOT SELL  THESE  SECURITIES  UNTIL THE  REGISTRATION  STATEMENT  FILED  WITH THE
SECURITIES AND EXCHANGE COMMISSION IS EFFECTIVE. THIS PROSPECTUS IS NOT AN OFFER
TO  SELL  THESE  SECURITIES  AND IT IS NOT  SOLICITING  AN  OFFER  TO BUY  THESE
SECURITIES IN ANY STATE WHERE THE OFFER OR SALE IS NOT PERMITTED.

<PAGE>


[BAR   GRAPH   INDICATING   THE  PRECLINICAL  AND  CLINICAL  STATUS  OF  CELGENE
CORPORATION'S ONCOLOGY, IMMUNOLOGY AND CHIRAL CHEMISTRY PROGRAMS.]

<PAGE>

You should rely only on the information  contained in this  prospectus.  We have
not  authorized  anyone to  provide  you with  information  different  from that
contained in this  prospectus.  We are offering to sell,  and seeking  offers to
buy,  shares of common  stock only in  jurisdictions  where offers and sales are
permitted.  The information  contained in this prospectus is accurate only as of
the  date  of this  prospectus,  regardless  of the  time  of  delivery  of this
prospectus or of any sale of our common stock.

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>

                                                        PAGE                                                                  PAGE
                                                        -----                                                                 -----
<S>                                                    <C>            <S>                                                    <C>
Prospectus Summary .................................      2           Business ...........................................     19
Risk Factors .......................................      6           Management .........................................     32
Forward-Looking Statements .........................     11           Selling Stockholder ................................     35
Use of Proceeds ....................................     12           Description of Capital Stock .......................     36
Price Range of Common Stock ........................     12           Shares Eligible for Future Sale ....................     38
Dividend Policy ....................................     12           Underwriting .......................................     39
Capitalization .....................................     13           Legal Matters ......................................     40
Selected Consolidated Financial Data ...............     14           Experts ............................................     40
Management's Discussion and Analysis                                  Where You Can Find More Information ................     41
   of Financial Condition and Results of                              Index to Consolidated Financial Statements .........    F-1
   Operations ......................................     15

</TABLE>

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

As used in this  prospectus,  the term  selling  stockholder  refers to  Hancock
Mezzanine Partners, LP, Signature 1A (Cayman),  Ltd., John Hancock Variable Life
Insurance Company and John Hancock Mutual Life Insurance Company.

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

We own or have the right to various  trademarks,  service  marks and trade names
used in our business.  These include THALOMID(Reg.  TM), S.T.E.P.S.TM,  IMiDsTM,
SelCIDsTM,  ATTENADETM and CelgroTM.  This prospectus also includes  trademarks,
service marks and trade names owned by other companies.


                                       1

<PAGE>

                              PROSPECTUS SUMMARY

This summary highlights information contained elsewhere in this prospectus. This
summary does not contain all of the information  that you should consider before
deciding  to  invest  in our  common  stock.  We urge  you to read  this  entire
prospectus  carefully,  including  the  information  under "Risk  Factors,"  the
consolidated financial statements and the related notes to those statements.

                              CELGENE CORPORATION

We  are an  independent  biopharmaceutical  company  engaged  in the  discovery,
development  and  commercialization  of  novel  human  pharmaceuticals  for  the
treatment of cancer and immunological diseases. Our primary therapeutic focus is
on the development of orally administered,  small molecule  pharmaceuticals that
regulate tumor necrosis  factor alpha, or TNF(alpha),  and are  anti-angiogenic.
TNF(alpha)   has  been  linked  to  the  cause  and  symptoms  of  many  chronic
inflammatory  and  immunological  diseases.  Anti-angiogenic  drugs  inhibit the
growth of undesirable blood vessels, including those that promote tumor growth.

Our lead product,  THALOMID  (thalidomide),  was approved for sale in the United
States  by the U.S.  Food and Drug  Administration,  or FDA,  on July 16,  1998.
THALOMID is approved for the treatment of erythema nodosum leprosum,  or ENL, an
inflammatory  complication of leprosy. During the first nine months of 1999, net
sales of  THALOMID  were $15.1  million,  primarily  for  cancer,  or  oncology,
indications.  Our 60 person sales and commercialization group sells this product
in the  United  States.  Our  regulatory  and  clinical  strategy  is to  obtain
approvals  for  THALOMID  for  additional  cancer  and   immunological   disease
indications.  THALOMID is currently  being evaluated in over 100 clinical trials
for  the  treatment  of  certain  blood  and  solid  tumor  cancers  as  well as
immunological  disorders  such as Crohn's  disease.  Several of these trials are
supported by the National Cancer Institute, or the NCI. Working with the FDA, we
have developed a novel  comprehensive  education and distribution  program,  the
"System for Thalidomide  Education and Prescribing Safety," or S.T.E.P.S.,  that
is designed to support the safe and appropriate use of THALOMID.

Our cancer and immunology  pharmaceutical pipeline is highlighted by two classes
of novel and proprietary oral  therapeutic  agents,  IMiDs, or  ImmunoModulatory
Drugs, and SelCIDs,  or Selective  Cytokine  Inhibitory  Drugs. Both classes are
being developed for the treatment of cancer, chronic inflammatory diseases, such
as inflammatory  bowel disease and rheumatoid  arthritis,  and other diseases of
the immune  system.  Our IMiDs are  thalidomide  analogues  that are designed to
modulate  TNF(alpha) and inhibit  angiogenesis  without causing birth defects or
sedation.  We have  completed  a Phase I safety  trial  for each of our two lead
IMiDs. Our SelCIDs are Phosphodiesterase type 4 inhibitors, or PDE 4 inhibitors.
Our SelCIDs have not, to date, shown any of the undesirable  side effects,  such
as nausea or vomiting,  often associated with PDE 4 inhibitors.  Our lead SelCID
was found to be well tolerated and did not cause nausea or vomiting in two Phase
I  clinical  trials  and is  currently  in a Phase II pilot  trial to assess its
potential for the treatment of Crohn's disease.  We own patents that cover these
compounds and their therapeutic applications.

We also have a chiral  chemistry  program  in which we develop  chemically  pure
versions of existing  compounds.  We recently announced the results of two Phase
III pivotal  efficacy trials of ATTENADE for the treatment of Attention  Deficit
Disorder,  or ADD,  and  Attention  Deficit  Hyperactivity  Disorder,  or  ADHD.
ATTENADE is a chirally pure version of dl-methylphenidate. dl-methylphenidate is
a generic drug that is  currently  sold under the trade name  Ritalin.  In these
trials,  ATTENADE  showed a  statistically  significant  benefit in  controlling
symptoms of ADD and ADHD and  demonstrated a  statistically  significant  longer
duration of behavior control versus dl-methylphenidate.  We expect to file a New
Drug Application,  or NDA, for ATTENADE with the FDA in the second half of 2000.
We hold six U.S.  patents  covering use and  formulations  of and  manufacturing
processes  for  ATTENADE.  Total  U.S.  sales in 1998 of drugs used to treat the
symptoms of ADD and ADHD were approximately $500 million.

We own or control exclusive  worldwide  development and marketing rights for all
of our current  products and products  under  development,  except for rights in
Canada with  respect to ATTENADE.  Our  strategy is to sell and market  products
that we develop for cancer and immunological disease indications with accessible
patient  populations.  In the United States,  we plan to implement this strategy
through our sales and  commercialization  group,  which we expect to continue to
expand.  We  anticipate   selectively   partnering  with  larger  pharmaceutical
companies with respect to

                                       2

<PAGE>

products we may develop for indications  with large patient  populations and for
overseas  markets.  We may also  partner to further  develop  and  commercialize
ATTENADE.   These  partnering  arrangements  are  likely  to  include  milestone
payments,  reimbursement  of  research  and  development  expenses  and  royalty
arrangements.

                              RECENT DEVELOPMENTS

In the fourth quarter of 1999, clinical trial results for THALOMID were featured
at major medical meetings and in prestigious peer review journals. These results
validated the potential use of THALOMID in the treatment of multiple myeloma and
its potential use in the treatment of a broad range of cancer and  immunological
diseases.  Multiple  myeloma is a malignant  cancer of plasma  cells of the bone
marrow.  In  addition,  we  achieved a  significant  milestone  in our  clinical
development program during this period. The developments  reported below provide
no  assurance  of  success  in  later  phases  of the  clinical  development  or
regulatory processes necessary for approval of our drugs.

o At the November 1999 Chemotherapy  Foundation  Symposium in New York, oncology
  teams from the University  College London,  NCI, New York  University  Medical
  Center,  the University of Arkansas  Cancer Research Center and Saint Vincents
  Medical  Center in New York  presented  positive data from five studies on the
  use of THALOMID. These studies used THALOMID, both in combination with various
  chemotherapeutic agents and as stand-alone therapy, in a number of solid tumor
  and blood cancers,  including prostate cancer, brain cancer, kidney cancer and
  multiple myeloma.

o Clinical research published during November 1999 in The New England Journal of
  Medicine  reported  the  results of a study on the use of THALOMID in multiple
  myeloma patients who had relapsed after high-dose  chemotherapy.  The Phase II
  trial,  conducted at the University of Arkansas Cancer Research Center,  found
  that 32% of patients  had a partial  response and 10% of patients had complete
  or nearly complete  remission.  An editorial authored by Noopur Raje, M.D. and
  Kenneth Anderson, M.D., both of the Dana-Farber Cancer Institute,  accompanied
  the article.

o At the November  1999  American  College of  Rheumatology  meeting,  data were
  presented  from small,  open label studies of  thalidomide in the treatment of
  three immunological diseases:  sclerodoma,  sarcoidosis and spondylarthopathy.
  Each of the three studies  presented positive clinical results.

o A total of 26 studies  were  presented or published at the 41st meeting of the
  American  Society of  Hematology,  or ASH, in  December  1999.  These  studies
  provided new data and expanded upon previously published results on the use of
  THALOMID in treating  advanced and refractory  multiple  myeloma.  The studies
  included  the use of  thalidomide  as a single  chemotherapeutic  agent and in
  combination with other chemotherapeutic agents. Studies were also presented on
  the  use of  THALOMID  to  treat  the  bone  marrow  disorder  myelodysplastic
  syndrome,  or  MDS.  In a  preliminary  report,  researchers  at  Rush  Cancer
  Institute in Chicago  observed  improvements in 50% of 20 evaluable  patients,
  with three long-standing,  transfusion  dependent patients able to discontinue
  transfusions.

o We have  completed  a Phase I safety  trial for two of our  IMiDs.  These were
  placebo controlled, double blind, escalating single dose trials carried out in
  healthy human volunteers. Results of these trials will be announced during the
  first quarter of 2000.

Celgene  Corporation  was  incorporated  in  Delaware  in  1986.  Our  principal
executive offices are located at 7 Powder Horn Drive,  Warren, New Jersey 07059;
our telephone number is (732) 271-1001.

                                       3

<PAGE>

                                  THE OFFERING

The  following  information  is based on 17,  703,  646  shares of common  stock
outstanding. This number excludes 4,847,376 shares of common stock issuable upon
the exercise of our outstanding stock options and warrants and conversion of our
convertible  notes,  other  than  the  conversion  by  the  selling  stockholder
immediately  prior to this offering of a portion of our 9.0%  convertible  notes
issued  in  January   1999.   This  number  also  assumes  no  exercise  of  the
underwriters' over-allotment option.

<TABLE>

<S>                                                <C>
COMMON STOCK OFFERED BY CELGENE .................. 2,000,000 shares

COMMON STOCK OFFERED BY THE SELLING
 STOCKHOLDER ..................................... 416,000 shares
COMMON STOCK OUTSTANDING AFTER THIS OFFERING ..... 20,119,646 shares
OVER-ALLOTMENT OPTION ............................ 362,400 shares

USE OF PROCEEDS .................................. We intend to use the net proceeds we receive from this
                                                   offering for:

                                                   o the further commercialization and clinical development
                                                     of THALOMID, including the expansion of our sales and
                                                     commercialization organization;

                                                   o the further development of our oncology and immunology
                                                     programs, including the IMiD and SelCID therapeutic
                                                     agents;

                                                   o the further development of our chiral products, including
                                                     ATTENADE; and

                                                   o general corporate purposes.

                                                   We will not receive any of the proceeds from the sale of
                                                   shares of our common stock by the selling stockholder.

DIVIDEND POLICY .................................. We have never declared or paid any cash dividends on our
                                                   common stock. We currently intend to retain any future
                                                   earnings for funding growth, and, therefore, do not anticipate
                                                   that we will pay any cash dividends on our common stock in
                                                   the foreseeable future.

NASDAQ NATIONAL MARKET SYMBOL .................... CELG

</TABLE>

                                       4

<PAGE>

                      SUMMARY CONSOLIDATED FINANCIAL DATA

The as  adjusted  balance  sheet data below is  adjusted  to reflect the sale of
2,000,000  shares of our common stock offered by us and the receipt by us of the
net proceeds  therefrom at an assumed public  offering price of $_____ per share
and after deduction of the underwriting  discounts and offering expenses payable
by us and the  conversion of a portion of our 9.0%  convertible  notes issued in
January 1999 held by the selling  stockholder  into 416,000 shares of our common
stock.

<TABLE>
<CAPTION>

                                              --------------------------------------------------------------------------
                                                                       YEAR ENDED DECEMBER 31,
                                              --------------------------------------------------------------------------
                                                        1994           1995           1996           1997           1998
                                              -------------- -------------- -------------- -------------- --------------
<S>                                           <C>            <C>            <C>            <C>            <C>
In thousands, except share data
STATEMENTS OF OPERATIONS DATA:
Total revenues ..............................   $       98     $      472     $      882     $    1,122     $    3,801
Total expenses ..............................        6,396          8,982         18,924         26,526         36,273
                                                ----------     ----------     ----------     ----------     ----------
Operating loss ..............................       (6,298)        (8,510)       (18,042)       (25,404)       (32,472)
Other income (expense), net .................          587            143            984            384            449
                                                ----------     ----------     ----------     ----------     ----------
Loss from continuing operations .............       (5,711)        (8,367)       (17,058)       (25,020)       (32,023)
Gain (loss) from discontinued operations.....       (4,502)        (2,150)          (761)          (427)         6,955
                                                ----------     ----------     ----------     ----------     ----------
Net loss ....................................      (10,213)       (10,517)       (17,819)       (25,447)       (25,068)
Accretion of premium payable on
 preferred stock and warrants ...............           --             --          1,013            521             25
Deemed dividend for preferred stock
 conversion discount ........................           --             --          2,778            953             --
                                                ----------     ----------     ----------     ----------     ----------
Net loss applicable to common

 stockholders ...............................   $  (10,213)    $  (10,517)    $  (21,610)    $  (26,921)    $  (25,093)
                                                ==========     ==========     ==========     ==========     ==========
Per share -- basic and diluted:
 Net loss applicable to common

  stockholders ...............................  $    (1.30)    $    (1.30)    $    (2.29)    $    (2.20)    $    (1.55)
Weighted average number of shares of
 common stock outstanding ...................        7,853          8,073          9,450         12,215         16,160

<CAPTION>

                                              ----------------------------
                                                   NINE MONTHS ENDED
                                                    SEPTEMBER 30,
                                              -----------------------------
                                                       1998           1999
                                              -------------- --------------
                                                        (UNAUDITED)

<S>                                             <C>            <C>
In thousands, except share data

STATEMENT OF OPERATIONS DATA:

Total revenues ..............................   $    1,136     $   16,796
Total expenses ..............................       25,235         34,289
                                                ----------     ----------
Operating loss ..............................      (24,099)       (17,493)
Other income (expense), net .................          452         (1,443)
                                                ----------     ----------
Loss from continuing operations .............      (23,647)       (18,936)
Gain (loss) from discontinued operations.....        6,955             --
                                                ----------     ----------
Net loss ....................................      (16,692)       (18,936)
Accretion of premium payable on
 preferred stock and warrants ...............           25             --
Deemed dividend for preferred stock
 conversion discount ........................           --             --
                                                ----------     ----------
Net loss applicable to common

 stockholders ...............................   $  (16,717)    $  (18,936)
                                                ==========     ==========
Per share -- basic and diluted:
 Net loss applicable to common

  stockholders ...............................  $    (1.04)    $    (1.12)
Weighted average number of shares of
 common stock outstanding ...................       16,062         16,903
</TABLE>

<TABLE>
<CAPTION>

                                                                          ----------------------------
                                                                               SEPTEMBER 30, 1999
                                                                          ----------------------------
                                                                                ACTUAL    AS ADJUSTED
                                                                          -------------   ------------
                                                                                  (UNAUDITED)
<S>                                                                       <C>             <C>
In thousands
BALANCE SHEET DATA:

Cash and cash equivalents and marketable securities available for sale     $   18,624      $
Total assets ..........................................................        27,089
Long term convertible notes ...........................................        38,458          30,971
Accumulated deficit ...................................................      (163,549)       (163,549)
Total stockholders' deficit ...........................................       (18,496)
</TABLE>

                                       5

<PAGE>

                                 RISK FACTORS

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

RISKS TO CELGENE

IF  WE  ARE  UNSUCCESSFUL  IN  DEVELOPING  AND COMMERCIALIZING OUR PRODUCTS, OUR
BUSINESS,  FINANCIAL  CONDITION  AND  RESULTS  OF OPERATIONS COULD BE MATERIALLY
ADVERSELY AFFECTED.

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

DURING THE NEXT  SEVERAL  YEARS,  WE WILL BE VERY  DEPENDENT  ON THE  COMMERCIAL
SUCCESS OF THALOMID.

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

IF OUR  PRODUCTS  ARE  NOT  ACCEPTED  BY THE  MARKET,  OUR  BUSINESS,  FINANCIAL
CONDITION AND RESULTS OF OPERATIONS COULD BE MATERIALLY ADVERSELY AFFECTED.

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

WE FACE A RISK  OF  PRODUCT  LIABILITY  CLAIMS  AND  MAY  NOT BE ABLE TO  OBTAIN
INSURANCE.

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

                                       6

<PAGE>

WE HAVE A HISTORY OF OPERATING LOSSES AND AN ACCUMULATED DEFICIT AND MAY NEED TO
SEEK ADDITIONAL FUNDING.

We have  sustained  losses in each  year  since our  incorporation  in 1986.  We
sustained  net losses of $25.1  million  and $25.4  million  for the years ended
December  31,  1998 and  1997,  and  $18.9  million  for the nine  months  ended
September 30, 1999. We had an  accumulated  deficit of $144.6 million and $119.5
million at December 31, 1998 and 1997, and $163.5 million at September 30, 1999.
We expect to make substantial  expenditures to further develop and commercialize
our products, and, based on these expenditures,  it is probable that losses will
continue  for at least the next six months.  We expect that our rate of spending
will  accelerate  as the result of increased  clinical  trial costs and expenses
associated with  regulatory  approval and  commercialization  of products now in
development.  In  order to fund  our  future  operations,  we will  likely  seek
additional capital. We may not be able to raise additional capital on reasonable
terms,  if at all.  There can be no assurance,  assuming we  successfully  raise
additional funds, that we will achieve profitability or positive cash flow.

WE MAY EXPERIENCE SIGNIFICANT FLUCTUATIONS IN OUR QUARTERLY OPERATING RESULTS.

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

o    demand for our products;

o    regulatory approvals for our products;

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

o    the timing of certain research and development milestones; and

o    our ability to control our costs.

WE  HAVE  NO MANUFACTURING CAPABILITIES AND WE ARE DEPENDENT ON ONE SUPPLIER FOR
THE  RAW  MATERIAL AND ONE MANUFACTURER FOR THE FORMULATION AND ENCAPSULATION OF
THALOMID.

We currently have no experience in, or our own facilities for, manufacturing any
products  on a  commercial  scale.  Currently,  we  obtain  all of our bulk drug
material for THALOMID from a single  supplier and rely on a single  manufacturer
to formulate and  encapsulate  THALOMID.  The FDA requires that all suppliers of
pharmaceutical  bulk material and all manufacturers of pharmaceuticals  for sale
in or from the United  States  achieve and  maintain  compliance  with the FDA's
current Good Manufacturing Practice, or cGMP, regulations and guidelines. If the
operations  of the  sole  supplier  or the  sole  manufacturer  were  to  become
unavailable  for any reason,  the required FDA review of the operations of a new
supplier or new manufacturer  could cause a delay in the manufacture of THALOMID
which could have a material adverse effect on our business,  financial condition
and  results  of   operations.   We  intend  to  continue  to  utilize   outside
manufacturers  if and when needed to produce our other  products on a commercial
scale. If our outside  manufacturers  do not meet our  requirements for quality,
quantity  or  timeliness,  or do not achieve and  maintain  compliance  with all
applicable  regulations,  our  business,  financial  condition  and  results  of
operations could be materially adversely affected.

WE HAVE LIMITED MARKETING AND DISTRIBUTION CAPABILITIES.

Although we have a 60 person sales and commercialization group to sell THALOMID,
we may be  required to seek a corporate  partner to provide  marketing  services
with respect to our other  products.  Any delay in  developing  these  resources
could have a material  adverse  impact on our  results  of  operations.  We have
contracted with a specialty distributor to distribute THALOMID.  Failure of this
specialty  distributor to perform its obligations  could have a material adverse
effect on our business, financial condition and results of operations.

WE ARE DEPENDENT ON COLLABORATIONS AND LICENSES WITH THIRD PARTIES.

Our ability to fully  commercialize  our products,  if developed,  may depend to
some extent upon our entering  into joint  ventures or other  arrangements  with
established pharmaceutical companies with the requisite experience and financial
and other resources to obtain regulatory approvals and to manufacture and market
such products. Accordingly, our success may depend, in part, upon the subsequent
success of such third parties in  performing  preclinical  and clinical  trials,
obtaining

                                       7

<PAGE>

the  requisite  regulatory  approvals,  scaling up  manufacturing,  successfully
commercializing  the licensed product candidates and otherwise  performing their
obligations to us. We cannot assure you that:

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

o    our joint ventures or other arrangements will be successful;

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

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

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

THE  HAZARDOUS  MATERIALS WE USE IN OUR RESEARCH AND DEVELOPMENT COULD RESULT IN
SIGNIFICANT  LIABILITIES WHICH COULD EXCEED OUR INSURANCE COVERAGE AND FINANCIAL
RESOURCES.

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

RESIDUAL YEAR 2000 PROBLEMS COULD CAUSE A MATERIAL DISRUPTION IN OUR BUSINESS.

Although  all of our computer  hardware and software has been  upgraded for Year
2000  compliance,  all of our key vendors have provided  assurance that they are
Year 2000 compliant and there were no related  problems at the  transition  into
the Year  2000,  any  residual  effect of the Year 2000  problem  could  cause a
material disruption in our business.

INDUSTRY RISKS

THE PHARMACEUTICAL AND AGROCHEMICAL  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 some cases, from the U.S. Environmental Protection
Agency,  or the EPA, and the U.S.  Department  of  Agriculture,  or the USDA, or
governmental authorities outside of the United States that perform roles similar
to  those  of the  FDA  and  EPA.  Certain  of our  pharmaceutical  products  in
development  also fall under the Controlled  Substances Act of 1970, or the CSA,
which requires authorization by the U.S. Drug Enforcement Agency, or the DEA, of
the U.S. Department of Justice in order to handle and distribute these products.
It is not possible to predict how long the approval  processes of the FDA,  EPA,
DEA or any other applicable  federal,  state or foreign regulatory  authority or
agency  for  any of our  products  will  take  or  whether  any  such  approvals
ultimately will be granted. Positive results in preclinical testing and/or early
phases of clinical  studies are no  assurance  of success in later phases of the
approval process. Risks associated with the regulatory approval process include:

o    in general,  preclinical tests and clinical trials can take many years, and
     require the  expenditure  of substantial  resources,  and the data obtained
     from these tests and 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, a
     regulatory  agency's  requirements for safety,  efficacy and quality or, in
     the case of a product  seeking an orphan drug  indication,  because another
     designee received approval first;

o    requirements  for  approval  may become  more  stringent  due to changes in
     regulatory   agency  policy,   or  the  adoption  of  new   regulations  or
     legislation;
                                       8

<PAGE>

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

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

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

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

Labeling and promotional activities are subject to scrutiny by the FDA and state
regulatory agencies and, in some circumstances, by the Federal Trade Commission.
FDA  enforcement  policy  prohibits  the  marketing  of  approved  products  for
unapproved, or off-label, uses. These regulations,  and the FDA's interpretation
of them, may impair our ability to effectively market THALOMID or other products
which gain approval. The FDA actively enforces regulations prohibiting promotion
of off-label  uses and the promotion of products for which approval has not been
obtained.  Failure to comply with these  requirements  can result in  regulatory
enforcement  action  by the FDA.  The FDA is  aware  that  physicians  prescribe
THALOMID  for  off-label  uses  and has  not,  as of this  date,  initiated  any
regulatory  actions  against  us. FDA  approval  of  THALOMID  requires  that we
distribute it under the rigid  standards of our  S.T.E.P.S.  program in order to
maintain approval.

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

WE MAY NOT BE ABLE TO PROTECT OUR INTELLECTUAL PROPERTY.

Our success will depend,  in part, on our ability to obtain and enforce patents,
protect trade  secrets,  obtain  licenses to technology  owned by third parties,
when  necessary,  and conduct our business  without  infringing the  proprietary
rights of others. The patent positions of pharmaceutical firms,  including ours,
can be uncertain and involve complex legal and factual  questions.  In addition,
the  coverage  sought  in a patent  application  may not be  obtained  or may be
significantly reduced before the patent is issued. Consequently,  we do not know
whether any of our pending  applications  will result in the issuance of patents
or, if any patents are issued, whether they will provide significant proprietary
protection or commercial advantage. If any of our issued or licensed patents are
infringed,  we cannot  guarantee  that we will be  successful  in enforcing  our
intellectual  property  rights.  Moreover,  we  cannot  assure  you  that we can
successfully  defend  against any patent  infringement  suit that may be brought
against us by a third party. Patent infringement  lawsuits in the pharmaceutical
and biotechnology industries can be complex, lengthy and costly to both parties.
Further, we rely upon unpatented proprietary and trade secret technology that we
try to protect,  in part, by  confidentiality  agreements with our collaborative
partners, employees,  consultants,  outside scientific collaborators,  sponsored
researchers and other advisors.  There can be no assurance that these agreements
will  not be  breached  or that we would  have  adequate  remedies  for any such
breach. We cannot assure you that, despite  precautions taken by us, others have
not and will not  obtain  access  to our  proprietary  technology  or that  such
technology will not be found to be  non-proprietary  or not a trade secret.  Our
right to  practice  the  inventions  claimed  in some  patents  which  relate to
products under  development and THALOMID arises under licenses  granted to us by
others,  including  EntreMed,  Inc.  and The  Rockefeller  University.  While we
believe these agreements to be valid and enforceable,  we cannot assure you that
our rights under these  agreements  will  continue or that  disputes  concerning
these agreement will not arise. In addition,  certain of the grants contained in
the licenses granted to us depend upon the validity and  enforceability of other
agreements to which we are not a party.

THE  PHARMACEUTICAL  AND  AGROCHEMICAL  INDUSTRIES  ARE HIGHLY  COMPETITIVE  AND
SUBJECT TO RAPID AND SIGNIFICANT TECHNOLOGICAL CHANGE.

The  pharmaceutical  and agrochemical industries  in which we operate are highly
competitive  and  subject to rapid and  significant  technological  change.  Our
present and  potential  competitors  include major  chemical and  pharmaceutical
companies, as well as specialized  pharmaceutical firms. Most of these companies
have considerably greater financial,  technical and marketing resources than us.
We also experience competition from universities and other research institutions

                                       9

<PAGE>

and, in some  instances,  we compete  with others in acquiring  technology  from
these sources.  The pharmaceutical  and agrochemical  industries have undergone,
and are  expected to continue to undergo,  rapid and  significant  technological
change,  and we expect  competition  to intensify as technical  advances in each
field are made and become  more widely  known.  The  development  of products or
processes with significant  advantages over those that we are seeking to develop
could have a material  adverse effect on our business,  financial  condition and
results of operations.

SALES OF OUR PRODUCTS ARE DEPENDENT ON THIRD-PARTY REIMBURSEMENT.

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

OFFERING RISKS

THE PRICE OF OUR COMMON STOCK HAS  EXPERIENCED  SUBSTANTIAL  VOLATILITY  AND MAY
CONTINUE TO DO SO IN THE FUTURE.

There has been  significant  volatility in the market prices for publicly traded
shares of  pharmaceutical  companies,  including ours. In 1999, the price of our
common stock  fluctuated from a low of $11 5/16 to a high of $72 5/8. On January
18,  2000,  our common  stock  closed at a price of $63 11/16.  The price of our
common stock may not remain at or exceed current levels.  The following  factors
may have an adverse impact on the market price of our common stock:

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

o    market conditions for pharmaceutical and biotechnology stocks;

o    market conditions generally;

o    governmental regulation;

o    healthcare legislation;

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

o    patent or proprietary rights developments;

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

o    fluctuations in our operating results.

THE  NUMBER OF  SHARES OF OUR  COMMON  STOCK  ELIGIBLE  FOR  FUTURE  SALE  COULD
ADVERSELY AFFECT THE MARKET PRICE OF OUR COMMON STOCK.

Future sales of substantial  amounts of our common stock could adversely  affect
the market  price of our common  stock.  As of  December  31,  1999,  there were
outstanding stock options for 2,292,627 shares of common stock, of which 967,234
were currently  exercisable,  and warrants  either  outstanding or issuable upon
demand that are exercisable for 552,444 shares of common stock. In addition, the
9.25% convertible notes issued on September 16, 1998 can be converted to 795,455
shares of common stock,  the 9.0%  convertible  notes issued on January 20, 1999
can be  converted  to 833,400  shares of common  stock and the 9.0%  convertible
notes  issued on July 6, 1999 can be  converted  into  789,450  shares of common
stock.  Immediately prior to this offering, the selling stockholder will convert
a portion of our 9.0%  convertible  notes issued in January 1999 held by it into
416,000 shares of our common stock.  Upon issuance or  conversion,  all of these
shares of common stock will be freely tradable.

                                       10

<PAGE>

INVESTORS IN THIS OFFERING WILL SUFFER IMMEDIATE AND SUBSTANTIAL DILUTION.

We expect that the public  offering  price of our common stock in this  offering
will be  substantially  higher than the net tangible book value per share of our
outstanding  common stock.  As of September 30, 1999, our net tagible book value
was $_____ and on a pro forma basis for this offering will be $_____. The amount
of the increase in net tangible book value attributable to the investors in this
offering will be $_____,  or $_____ per share of common stock.  Investors of our
common stock in this offering will experience immediate and substantial dilution
pershare of approximately $_____, or $_____ per share of common stock.

OUR SHAREHOLDER  RIGHTS PLAN AND CERTAIN CHARTER AND BY-LAW PROVISIONS MAY DETER
A THIRD PARTY FROM ACQUIRING US.

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

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

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

                          FORWARD-LOOKING STATEMENTS

Certain statements contained or incorporated by reference in this prospectus are
forward-looking statements concerning our business, financial condition, results
of operations,  economic  performance and financial  condition.  Forward-looking
statements  within the meaning of Section 27A of the  Securities Act of 1933 and
within the meaning of Section  21E of the  Securities  Exchange  Act of 1934 are
included, for example, in the discussions about:

o    our strategy;

o    new product development or product introduction;

o    product sales, royalties and contract revenues;

o    expenses and net income;

o    our credit risk management;

o    our liquidity;

o    our asset/liability risk management; and

o    our operational and legal risks.

These  statements  involve risks and  uncertainties.  Actual  results may differ
materially  from those  expressed or implied in those  statements.  Factors that
could cause such  differences  include,  but are not limited to, those discussed
under "Risk  Factors"  and  "Management's  Discussion  and Analysis of Financial
Condition and Results of Operations."

                                       11

<PAGE>

                                USE OF PROCEEDS

We  estimate  that the net  proceeds  from the sale of  2,000,000  shares of our
common  stock  offered  by us  will  be  approximately  $_____,  $_____  if  the
underwriters'  over-allotment  option is exercised in full, at an assumed public
offering  price of $_____  per share and  after  deduction  of the  underwriting
discounts and estimated offering expenses payable by us. We will not receive any
proceeds from the sale of shares of common stock in this offering by the selling
stockholder.

We intend to use the net proceeds we receive from this offering for:

o    the  further   commercialization  and  clinical  development  of  THALOMID,
     including the expansion of our sales and commercialization organization;

o    the further development of our oncology and immunology programs,  including
     our IMiD and SelCID therapeutic agents;

o    the further development of our chiral products, including ATTENADE; and

o    general corporate purposes.

Pending use of the net  proceeds  we receive  from this  offering  for the above
purposes, we intend to invest funds in investment grade debt obligations.

                          PRICE RANGE OF COMMON STOCK

Our  common  stock is traded on the  Nasdaq  National  Market  under the  symbol
"CELG." The following table sets forth, for the periods indicated, the intra-day
high and low sale  prices  per  share of  common  stock on the  Nasdaq  National
Market:

<TABLE>
<CAPTION>

                                                     -----------------------
                                                           HIGH          LOW
                                                     ----------   ----------
<S>                                                  <C>          <C>
2000
First Quarter (through January 18, 2000) .........   $70 3/8      $ 55

1999
Fourth Quarter ...................................   $ 72 5/8     $ 24 3/4
Third Quarter ....................................     29           14
Second Quarter ...................................     20 1/16      13 9/16
First Quarter ....................................     18 5/8       11 5/16

1998
Fourth Quarter ...................................   $ 17 1/4     $ 7 1/2
Third Quarter ....................................     15           4 1/8
Second Quarter ...................................     11 1/2       8 1/4
First Quarter ....................................     11 5/8       6 15/16
</TABLE>

The last reported  sales price per share of common stock on the Nasdaq  National
Market on January 18, 2000 was $63 11/16.  As of December 31,  1999,  there were
approximately 450 holders of record of our common stock.

                                DIVIDEND POLICY

We have  never  declared  or paid any cash  dividends  on our common  stock.  We
currently  intend  to  retain  any  future  earnings  for  funding  growth  and,
therefore,  do not  anticipate  paying any cash dividends on our common stock in
the foreseeable future.

                                       12

<PAGE>

                                CAPITALIZATION

The following table sets forth, as of September 30, 1999:

o    our actual cash and cash  equivalents and marketable  securities  available
     for sale and capitalization;

o    our cash and cash equivalents and marketable  securities available for sale
     and capitalization as adjusted to reflect:

  --    the sale of 2,000,000  shares of our common stock  offered by us and the
        receipt  by us of  the  net  proceeds  therefrom  at an  assumed  public
        offering  price  of   $_____  per  share  and  after  deduction  of  the
        underwriting discounts and offering expenses payable by us; and

  --    the  conversion  by  the  selling stockholders of a portion  of our 9.0%
        convertible notes issued in January 1999 held by the selling stockholder
        into 416,000 shares of our common stock.

This  table  should  be read in  conjunction  with  our  consolidated  financial
statements and the related notes thereto included elsewhere in this prospectus.

<TABLE>
<CAPTION>

                                                                                          ----------------------------
                                                                                               SEPTEMBER 30, 1999
                                                                                          ----------------------------
                                                                                                 ACTUAL    AS ADJUSTED
In thousands                                                                              -------------   ------------
<S>                                                                                       <C>             <C>
Cash and cash equivalents and marketable securities available for sale ................    $   18,624      $
                                                                                           ==========      ==========
Capital lease obligation net of current portions ......................................    $       45      $       45
Long term convertible notes ...........................................................        38,458          30,971
Stockholders' equity (deficit):
 Common stock, $.01 par value per share; 30,000,000 shares authorized; 17,151,595
   shares issued and outstanding; 19,567,595 shares issued and outstanding as adjusted            172             196
 Additional paid-in capital ...........................................................       144,945
 Accumulated deficit ..................................................................      (163,549)       (163,549)
 Accumulated other comprehensive loss .................................................           (64)            (64)
                                                                                           ----------      ----------
   Total stockholders' deficit ........................................................       (18,496)
                                                                                           ----------      ----------
     Total capitalization .............................................................    $   20,007      $
                                                                                           ==========      ==========

</TABLE>

The above table, as of December 31, 1999, 2,418,305 excludes  552,444 shares  of
common stock  reserved  for  issuance  upon conversion of our convertible notes,
shares reserved for issuance  upon  exercise  of our  outstanding  warrants  and
2,292,627 shares  reserved for issuance upon exercise of  our outstanding  stock
options.

                                       13

<PAGE>

                     SELECTED CONSOLIDATED FINANCIAL DATA

The following selected consolidated financial data should be read in conjunction
with our  consolidated  financial  statements  and the  related  notes  thereto,
"Management's  Discussion  and  Analysis of Financial  Condition  and Results of
Operations"  and  other  financial   information   included  elsewhere  in  this
prospectus.  The  statements  of  operations  data set forth below for the years
ended December 31, 1996, 1997 and 1998 and the balance sheet data as of December
31, 1997 and 1998 are derived from our consolidated  financial  statements which
have been audited by KPMG LLP,  independent  certified public  accountants,  and
which are included  elsewhere in this  prospectus and are qualified by reference
to such consolidated  financial  statements and the related notes thereto.  Some
other  information  has been derived from other audited  consolidated  financial
statements.  The  statements  of  operations  data set forth  below for the nine
months  ended  September  30, 1998 and 1999,  and the  balance  sheet data as of
September 30, 1999 have been derived from our unaudited  consolidated  financial
statements which are included  elsewhere in this prospectus and are qualified by
reference to such unaudited condensed  consolidated financial statements and the
related notes thereto.  The interim nine month data has been prepared on a basis
consistent with that of the audited condensed  consolidated financial statements
and, in the opinion of our management, include all adjustments,  consisting only
of normal recurring accruals, necessary for a fair presentation.  Our historical
results  of  operations  are not  necessarily  indicative  of future  results of
operations.

<TABLE>
<CAPTION>

                                           ------------------------------------------------------------------
                                                                YEAR ENDED DECEMBER 31,
                                           ------------------------------------------------------------------
                                                    1994          1995         1996         1997         1998
In thousands, except share data            ------------- ------------- ------------ ------------ ------------
<S>                                        <C>           <C>           <C>          <C>          <C>

STATEMENTS OF OPERATIONS DATA:
Revenues:
 Product sales ...........................   $      --     $      32    $      65    $      --    $   3,266
 Research contracts ......................          98           440          817        1,122          535
                                             ---------     ---------    ---------    ---------    ---------
  Total revenues .........................          98           472          882        1,122        3,801
Expenses:
 Cost of goods sold ......................          --            --           --           --          282
 Research and development ................       3,678         6,393       15,153       17,380       19,772
 Selling, general and administrative .....       2,718         2,589        3,771        9,146       16,219
                                             ---------     ---------    ---------    ---------    ---------
  Total expenses .........................       6,396         8,982       18,924       26,526       36,273
                                             ---------     ---------    ---------    ---------    ---------
Operating loss ...........................      (6,298)       (8,510)     (18,042)     (25,404)     (32,472)
Other income and expense:
 Interest income .........................         587           568        1,308          496          705
 Interest expense ........................          --           425          324          112          256
                                             ---------     ---------    ---------    ---------    ---------
Loss from continuing operations ..........      (5,711)       (8,367)     (17,058)     (25,020)     (32,023)
Discontinued operations:
 Loss from operations ....................      (4,502)       (2,150)        (761)        (427)         (60)
 Gain on sale of chiral assets ...........          --            --           --           --        7,015
                                             ---------     ---------    ---------    ---------    ---------
Net loss .................................     (10,213)      (10,517)     (17,819)     (25,447)     (25,068)
Accretion of premium payable on
 preferred stock and warrants ............          --            --        1,013          521           25
Deemed dividend for preferred stock
 conversion discount .....................          --            --        2,778          953           --
                                             ---------     ---------    ---------    ---------    ---------
Net loss applicable to common
 stockholders ............................   $ (10,213)    $ (10,517)   $ (21,610)   $ (26,921)   $ (25,093)
                                             =========     =========    =========    =========    =========
Per share--basic and diluted:
 Loss from continuing operations .........   $   (0.73)    $   (1.04)   $   (1.81)   $   (2.05)   $   (1.98)
 Discontinued operations:
   Loss from operations ...................      (0.57)        (0.27)       (0.08)       (0.03)          --
   Gain on sale of chiral assets ..........         --            --           --           --         0.43
                                             ---------     ---------    ---------    ---------    ---------
  Net loss applicable to common
  stockholders ............................  $   (1.30)    $   (1.30)   $   (2.29)   $   (2.20)   $   (1.55)
                                             =========     =========    =========    =========    =========
Weighted average number of shares of
 common stock outstanding ................       7,853         8,073        9,450       12,215       16,160







<CAPTION>

                                           ------------------------
                                               NINE MONTHS ENDED
                                                 SEPTEMBER 30,
                                           -------------------------
                                                   1998         1999
In thousands, except share data            ------------ ------------
                                                  (UNAUDITED)

<S>                                        <C>          <C>
STATEMENTS OF OPERATIONS DATA:
Revenues:
 Product sales ...........................  $   1,031    $  15,064
 Research contracts ......................        105        1,732
                                            ---------    ---------
  Total revenues .........................      1,136       16,796
Expenses:
 Cost of goods sold ......................         59        2,076
 Research and development ................     13,969       14,366
 Selling, general and administrative .....     11,207       17,847
                                            ---------    ---------
  Total expenses .........................     25,235       34,289
                                            ---------    ---------
Operating loss ...........................    (24,099)     (17,493)
Other income and expense:
 Interest income .........................        497          512
 Interest expense ........................         45        1,955
                                            ---------    ---------
Loss from continuing operations ..........    (23,647)     (18,936)
Discontinued operations:
 Loss from operations ....................        (60)          --
 Gain on sale of chiral assets ...........      7,015           --
                                            ---------    ---------
Net loss .................................    (16,692)     (18,936)
Accretion of premium payable on
 preferred stock and warrants ............         25           --
Deemed dividend for preferred stock
 conversion discount .....................         --           --
                                            ---------    ---------
Net loss applicable to common
 stockholders ............................  $ (16,717)   $ (18,936)
                                            =========    =========
Per share--basic and diluted:
 Loss from continuing operations .........  $   (1.47)   $   (1.12)
Discontinued operations:
  Loss from operations ....................        --           --
  Gain on sale of chiral assets ...........      0.44           --
                                            ---------    ---------
 Net loss applicable to common
 stockholders ............................  $   (1.04)   $   (1.12)
                                            =========    =========
Weighted average number of shares of
 common stock outstanding ................     16,062       16,903
</TABLE>

<TABLE>
<CAPTION>

                                             ------------------------------------------------------------------ --------------------
                                                                        DECEMBER 31,                                   SEPTEMBER 30,
                                             ------------------------------------------------------------------
                                                     1994         1995         1996          1997          1998                1999
In thousands                                 ------------ ------------ ------------ ------------- ------------- --------------------
<S>                                          <C>          <C>          <C>          <C>           <C>        <C>    <C>
BALANCE SHEET DATA:                                                                                                  (UNAUDITED)
Cash and cash equivalents and
 marketable securities available for sale     $    8,500   $   11,713   $   17,815   $    13,583   $     5,124      $    18,624
Total assets ...............................      11,548       14,211       20,938        18,217        11,928           27,089
Long term convertible notes ................          --        4,592        2,026            --         8,349           38,458
Accumulated deficit ........................     (60,473)     (70,989)     (92,599)     (119,521)     (144,613)        (163,549)
Total stockholders' equity (deficit) .......      10,004        7,143       16,065        15,425        (3,733)         (18,496)

</TABLE>

                                       14

<PAGE>

                     MANAGEMENT'S DISCUSSION AND ANALYSIS
               OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following  discussion  of our financial  condition and results of operations
should be read in conjunction with our consolidated financial statements and the
related notes thereto included elsewhere in this prospectus.

OVERVIEW

We were organized in 1980 as a unit of Celanese Corporation, a chemical company.
Our initial  mandate was to apply  biotechnology  to the  production of fine and
specialty  chemicals.  Following  the 1986 merger of Celanese  Corporation  with
American Hoechst  Corporation,  we were spun off as an independent  company.  In
July 1987,  we  completed  an initial  public  offering of our common  stock and
commenced  the  development  of  chemical  and  biotreatment  processes  for the
chemical  and  pharmaceutical   industries.  We  discontinued  the  biotreatment
operations in 1994 to focus on our targeted small molecule cancer and immunology
compound development programs and our biocatalytic chiral chemistry program.

Since 1990,  our revenues have been  generated  primarily  through  research and
development   relating  to,  and  supply  of,  chirally  pure  intermediates  to
pharmaceutical  companies  for use in new  drug  development  and,  to a  lesser
degree,  from agrochemical  research and development  contracts.  However, as we
developed  our  cancer  and   immunology   programs,   sales  of  chirally  pure
intermediates  became a less integral part of our strategic focus.  Accordingly,
on January 9, 1998, we completed the sale of our chiral intermediate business to
Cambrex Corporation for $15.0 million.  The terms provided for a payment of $7.5
million at closing and the  estimated  net present value on the date of contract
of $7.5 million in future  royalties,  with certain minimum royalty  payments in
the third through the sixth years after closing.

In late  September  1998, we commenced  sales of our first  commercial  product,
THALOMID.

We have sustained  losses in each year since our inception in 1986.  Through the
first nine months of 1999,  we had a net loss of $18.9 million and, at September
30,  1999,  had an  accumulated  deficit  of $163.5  million.  We expect to make
substantial expenditures to further commercialize and develop THALOMID,  develop
our oncology and immunology  programs and expand our chiral  business.  Based on
these expenditures, it is likely that losses will continue for at least the next
six months.

Subject to the risks  described  elsewhere in this  prospectus,  we believe that
there are significant market  opportunities for the products and processes under
development  by us. To address  these  opportunities  in a timely and  effective
manner,  we intend to seek out  collaborations  and licensing  arrangements with
third parties.  We have entered into  agreements  covering the  manufacture  and
distribution for us of certain compounds,  such as THALOMID, and the development
by us of  processes  for  producing  chirally  pure crop  protection  agents for
license to agrochemical  manufacturers.  This  development is performed  through
Celgro Corporation, our wholly owned subsidiary.

We have established a commercial  organization to sell THALOMID and we currently
employ 60 persons  in this  capacity.  We intend to  develop  and market our own
pharmaceuticals for indications with accessible patient  populations.  For drugs
with indications for larger patient populations,  we anticipate  partnering with
other pharmaceutical companies. We also anticipate partnering with companies for
the development and  commercialization  of our chirally pure  pharmaceutical and
agrochemical  products. We expect that these arrangements typically will include
milestone  payments,  reimbursement  of research  and  development  expenses and
royalty arrangements.

Future operating  results will depend on many factors,  including demand for our
products,  regulatory approvals of our products,  the timing of the introduction
and market acceptance of new products by us or competing  companies,  the timing
of research and development milestones and our ability to control costs.

                                       15

<PAGE>

RESULTS OF OPERATIONS

Nine Months Ended September 30, 1999 and 1998

Total revenues.  Our total revenues for the nine months ended September 30, 1999
increased to $16.8  million  from $1.1  million in the same period of 1998.  Our
revenues  for the 1999 period  consisted  of product  sales of THALOMID of $15.1
million and research  contract  revenues of $1.7 million.  The increase in total
revenues in the 1999 period was  primarily due to a full nine months of sales of
THALOMID  compared  with sales from the initial  launch of THALOMID  late in the
third  quarter of 1998, a milestone  payment from an existing  d-methylphenidate
research agreement and research contract revenue generated by Celgro.

Cost of goods sold.  Cost of goods sold for the nine months ended  September 30,
1999 was $2.1 million compared with approximately  $59,000 in the same period in
1998.  The cost of goods sold does not reflect raw material or  formulation  and
encapsulation costs of THALOMID prior to receiving FDA approval,  as these costs
were charged as research and development expenses.

Research and development  expenses.  Research and development expenses increased
3% to $14.4  million in the nine  months  ended  September  30,  1999 from $14.0
million in the same period in 1998. The increase in spending was due to clinical
trial costs,  primarily  for ATTENADE,  of $3.1  million,  which was offset by a
decrease or  reclassification  of the following:  regulatory  consulting fees of
approximately  $600,000; quality assurance  expenses of approximately  $633,000,
which were recorded in cost of goods sold in 1999; external  university research
program  expenses of  approximately  $362,000;   formulation  and  encapsulation
expenses  for  THALOMID  of $1.0  million  incurred  prior  to FDA  approval  of
THALOMID; and other expenses of approximately $500,000.

Selling,   general   and   administrative   expenses.   Selling,   general   and
administrative  expenses  increased  by 59% to $17.8  million in the nine months
ended  September  30, 1999 from $11.2  million in the same period of 1998.  This
increase was due primarily to the  expansion of our sales and  commercialization
organization   and  related   expenses  of  $2.4  million  and  warehousing  and
distribution expenses,  including our S.T.E.P.S.  program, of $2.9 million, both
to support the  commercial  sales of  THALOMID.  This  increase  was also due to
expenses for the medical  affairs and drug safety  department  of  approximately
$600,000,   amortization  of  expenses  related  to  our  convertible  notes  of
approximately   $500,000  and  other  miscellaneous  expenses  of  approximately
$200,000.

Interest income and interest expense.  Interest income for the nine months ended
September 30, 1999  increased 3% to  approximately  $512,000 from  approximately
$497,000 in the same period of 1998. The increase in interest  income was due to
higher  average cash  balances in 1999,  primarily  from  investment  of the net
proceeds from our 9.0% convertible  notes issued in July 1999.  Interest expense
for the nine months ended  September 30, 1999  increased  significantly  to $2.0
million from  approximately  $45,000 in the same period in 1998. The increase in
interest expense was due to interest on our three  convertible notes with coupon
rates of 9.25%,  9.0% and 9.0% placed in September  1998,  January 1999 and July
1999.

Loss from continuing  operations.  Loss from continuing  operations for the nine
months ended  September  30, 1999  decreased by 20% to $18.9  million from $23.6
million in the same period of 1998.  The decrease was due primarily to the gross
profit on the sales of THALOMID and increased  research  contract revenue offset
by increased  research and development and selling,  general and  administrative
expenses as described above.

Discontinued  operations.  Discontinued operations in 1998 reflects the one-time
gain on the  sale of our  chiral  intermediate  business  of $7.0  million.  The
$60,000 loss in the nine months ended September 30, 1998 represents expenses for
the nine-day period preceding the sale. There were no discontinued operations in
1999.

Fiscal Years Ended December 31, 1998, 1997 and 1996

Total revenues.  In 1998, total revenues  increased by 245% to $3.8 million from
$1.1 million in 1997. This was due to product sales of $3.3 million of THALOMID,
which was launched in late September 1998, offset by a decrease in revenues from
research  contracts of  approximately  $600,000 due to  completion of a contract
with a major  agrochemical  company at the end of 1997.  Our  revenues  for 1997
represented  an increase of 27% over 1996  revenues of  approximately  $882,000.
Revenues were  primarily  from product sales in 1998 and research  contracts for
the years 1997 and 1996.

Cost of goods sold.  Cost of goods sold in 1998 was  approximately  $282,000 and
relates to THALOMID,  our first commercial  product,  which was launched in late
September  1998.  The cost of  goods  sold  does not  reflect  raw  material  or
formulation and encapsulation costs of THALOMID prior to receiving FDA approval,
as these were charged as research and development  expenses.  There were no cost
of goods sold in 1997 or 1996.

                                       16

<PAGE>

Research and development  expenses.  Research and development  expenses for 1998
increased by 14% to $19.8 million from $17.4 million in 1997.  This increase was
due to an increase of $1.5 million primarily for clinical trials and preclinical
toxicology  studies for our chiral  pharmaceutical  program,  and  approximately
$780,000 due to clinical trials for potential NDA filings for THALOMID.

Research and  development  expenses for 1997  increased by 15% to $17.4  million
from $15.2 million in 1996.  This increase was due to an increase in expenses of
approximately  $823,000  associated with our chiral  pharmaceutical  program and
$1.3  million   associated  with  facility  and  personnel  charges  related  to
establishing a separate location for our chiral agrochemical business.

Selling,   general   and   administrative   expenses.   Selling,   general   and
administrative  expenses for 1998  increased  by 78% to $16.2  million from $9.1
million in 1997. This was primarily due to sales and commercialization  expenses
of $4.8  million  in  anticipation  of the  THALOMID  product  launch as well as
post-launch   selling   activities.   The  increase  was  also  related  to  the
infrastructure  costs required to support our commercial  operations,  including
medical  affairs and drug safety costs of  approximately  $928,000,  information
systems  development  costs and additional  finance  personnel of  approximately
$423,000  and  other  administrative  expenses  such as  legal,  consulting  and
investor relations of approximately $900,000.

Selling,  general and administrative expenses for 1997 increased by 143% to $9.1
million from $3.8 million in 1996.  This was primarily due to the formation of a
sales and commercialization organization in anticipation of the THALOMID product
launch as well as an  increase  in some  support  functions  resulting  from the
anticipated transition to a commercial operation. Major increases resulted from:
sales and commercialization  expenses of $3.4 million for sales force recruiting
and  training and other  pre-launch  expenses;  medical  affairs and drug safety
costs of approximately  $425,000;  additional  finance personnel and information
systems   development   costs   of   approximately   $366,000;   executive   and
administrative   costs  for  Celgro  of   approximately   $487,000;   and  other
administrative  expenses  such as legal,  consulting  and investor  relations of
approximately $600,000.

Interest income and interest expense.  Interest income for 1998 increased by 42%
to approximately  $705,000 from approximately $496,000 in 1997. The increase was
due to higher average cash balances in 1998.  Interest income for 1997 decreased
by 62% from $1.3  million  in 1996.  This  decrease  was  attributable  to lower
average  cash  balances in 1997.  Interest  expense for 1998  increased  129% to
approximately  $256,000 from approximately $112,000 in 1997 due primarily to the
interest  expenses  associated  with  our  9.25%  convertible  notes  issued  in
September  1998.  Interest  expense  in 1997  decreased  65% from  approximately
$324,000 in 1996.  The decrease was due to the  conversion to equity of our 8.0%
convertible debentures issued in 1995.

Loss from continuing  operations.  Loss from continuing operations increased 28%
to $32.0 million from $25.0  million in 1997.  The increase was due primarily to
spending  related to the launch of  THALOMID  and ongoing  research  programs in
oncology,  immunology and chiral  pharmaceuticals  as described  above. The loss
from continuing  operations for 1997 increased by 46% from $17.1 million in 1996
reflecting  increased  spending  in  oncology  and  immunology,  the  start of a
THALOMID sales and  commercialization  organization  and the start of our chiral
pharmaceutical development program.

Loss  from  discontinued  operations.  The  loss  from  discontinued  operations
decreased to approximately  $60,000 in 1998 from approximately  $427,000 in 1997
due to the sale of the chiral intermediate business in January 1998. We recorded
a gain on the sale of the chiral intermediate  assets of $7.0 million.  The loss
from  discontinued  operations  decreased  by 44%  in  1997  from  approximately
$761,000 in 1996. The decrease was primarily a result of an increase in revenues
to $2.1 million in 1997 from $1.4 million in 1996.

LIQUIDITY AND CAPITAL RESOURCES

Since our inception in 1986, we have financed our working  capital  requirements
primarily  through  private and public sales of our debt and equity  securities,
income  earned  on  the  investment  of the  proceeds  from  the  sale  of  such
securities,  revenues from  research  contracts,  product sales from  businesses
which we have since sold and currently from revenues from sales of THALOMID.  We
have raised  approximately  $100.0 million in net proceeds from three public and
three private offerings,  including our initial public offering in July 1987. We
also issued convertible notes in September 1998, January 1999 and July 1999 with
net proceeds aggregating $38.0 million.

Our net working capital as of September 30, 1999 was $17.2 million compared with
$2.5 million at December 31, 1998. The increase was  attributable to an increase
in cash and cash  equivalents  and marketable  securities  available for sale of
$13.5 million, an increase in accounts receivable and inventory of approximately
$780,000, an increase in other current

                                       17

<PAGE>

assets  of  approximately  $450,000  and  a  decrease  in  accounts  payable  of
approximately   $808,000   offset  by  an  increase   in  accrued   expenses  of
approximately  $784,000.  Net working capital consisted  principally of cash and
cash equivalents, marketable securities available for sale, accounts receivable,
inventory, accounts payable and accrued expenses.

Cash and cash equivalents increased by $11.3 million in the first nine months of
1999 and marketable  securities  increased $2.2 million in the same period. This
increase  reflects  the receipt in January  1999 and July 1999 of funds from the
issuance of two convertible notes as well as increasing  revenues from the sales
of THALOMID.

We expect that our rate of  spending  will  increase as the result of  increased
clinical trial costs, increased expenses associated with the regulatory approval
process and  commercialization  of products now in development,  increased costs
related to the  commercialization  of THALOMID  and  increased  working  capital
requirements.  This  increased  spending will be mitigated by the  collection of
receivables  resulting  from  sales  of  THALOMID.  It is  anticipated  that the
increasing  sales of  THALOMID,  as well as  existing  cash  resources,  will be
sufficient to fund operations through 2000.

YEAR 2000 COMPUTER SYSTEMS COMPLIANCE

All of our  computer  hardware  and  software  has been  upgraded  for Year 2000
compliance.  All of our key vendors have provided  assurance  that they are Year
2000 compliant. While there were no Year 2000 related problems at the transition
in the Year 2000,  we are  maintaining  our  contingency  plans in the event any
problems arise in the future.

The statement  contained in the foregoing  Year 2000  readiness  disclosures  is
subject to protection under Year 2000 Information and Readiness Disclosure Act.

                                       18

<PAGE>

                                   BUSINESS

OVERVIEW

We  are  an  independent  biopharmaceutical  company  engaged  primarily  in the
discovery,  development  and  commercialization  of orally  administered,  small
molecule drugs for the treatment of cancer and immunological  diseases.  The key
mechanisms  of action  for our drugs are  modulation  of the  overproduction  of
TNF(alpha) and inhibition of  angiogenesis.  Additionally,  our chiral chemistry
program  develops  chirally  pure  versions  of  existing   compounds  for  both
pharmaceutical and agrochemical markets.

The FDA approved our first  commercialized  product,  THALOMID,  for sale in the
United  States in July 1998.  The  approved  indication  for THALOMID is for the
treatment  of acute  cutaneous  manifestations  of moderate to severe ENL and as
maintenance  therapy for prevention and  suppression of cutaneous  manifestation
recurrences.  ENL is an  inflammatory  complication  of  leprosy.  We sell  this
product in the United States  through our 60 person sales and  commercialization
organization.

Our pipeline of new drugs is highlighted  by two classes of orally  administered
therapeutic agents:  IMiDS and SelCIDs.  The IMiD class is based on the activity
of THALOMID in  modulating  the  overproduction  of  TNF(alpha)  and  inhibiting
angiogenesis. In preclinical studies, our IMiDs have demonstrated a higher level
of activity than  thalidomide.  In animal models,  these compounds did not cause
birth  defects or  sedation.  We  completed  their  Phase I trials in the fourth
quarter  of 1999 for each of our lead  IMiDs.  We expect  that the data on these
trials will be compiled and released in the first quarter of 2000.

The second class of compounds,  SelCIDs,  is designed to modulate  TNF(alpha) by
selectively  inhibiting  PDE 4, a key  cell-signaling  enzyme.  Our  SelCIDs are
targeted to control inflammation without broad suppression of the immune system.
Phase I trials demonstrated our lead SelCID compound, CDC 801, was safe and well
tolerated.  There were no signs of nausea or  vomiting,  common side  effects of
known PDE 4  inhibitors.  CDC 801 is being  tested in a Phase II pilot,  placebo
controlled trial for the treatment of Crohn's disease. This trial is expected to
be completed in the first quarter of 2000.

In the third quarter of 1999,  we announced  favorable  clinical  results of two
Phase III pivotal  efficacy  trials for  ATTENADE,  a chirally  pure  version of
dl-methylphenidate. dl-methylphenidate is commonly marketed as Ritalin. ATTENADE
is  designed  to treat the  symptoms  of ADD and ADHD.  We expect that the final
12-month safety trial will be completed in the first quarter of 2000 and we plan
to submit an NDA to the FDA in the second half of 2000.

                                       19

<PAGE>

CELGENE PRODUCT OVERVIEW

The target disease  states for, and clinical  trial status of,  THALOMID and our
products and compounds currently under development are outlined in the following
table:

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------
- -----------------------------------------------------------------------------------------------
PRODUCT        INDICATION/INTENDED USE             STATUS
- ------------   ---------------------------------   --------------------------------------------
<S>            <C>                                 <C>

THALOMID       ENL                                 Approved

               Multiple                            Phase   II   trial   data   a
               Myeloma                             published  and  presented  at
                                                   the   American   Society   of
                                                   Hematology  Phase III pivotal
                                                   trial protocol in preparation

               Myelodysplastic Syndrome            Phase II trial ongoing and initial data
                                                   presented at the American Society of
                                                   Hematology

               Leukemia                            Multiple Phase II trials underway
               Glioblastoma(1)                     Multiple Phase II trials underway
               Liver Cancer                        Phase II trial underway
               Kidney Cancer                       Phase II trial underway
               Prostate Cancer(1)                  Initial Phase II trial completed
                                                   Other Phase II trials underway

               Kaposi's Sarcoma(1)                 Phase II trial completed
               Cancer Cachexia                     Phase II trial completed
               Sarcoidosis                         Initial Phase II trial completed

                                                   Other Phase II trials underway

               Scleroderma                         Phase II  completed

               Recurrent  Aphthous  Stomatitis     Phase  III  pivotal  trial  completed
               in AIDS  patients

               Crohn's disease                     Phase II trial completed and initial data
                                                   published

               Ulcerative Colitis                  Phase II trial underway
               Colon and Rectal Cancer(1)          Phase II trial announced

SelCIDs

  CDC 801      Crohn's disease                     Phase II trial underway
  CC 7085      Crohn's disease                     Preclinical toxicology
IMiDs

  CC 5013      Blood cancers                       Phase Ia trial completed
  CC 4047      Blood cancers                       Phase Ia trial completed
ATTENADE       Attention Deficit Disorder and      Phase III pivotal efficacy trials completed
               Attention Deficit Hyperactivity     Phase III safety trials ongoing
               Disorder

</TABLE>

- ---------------
(1) At least one study supported by the National Cancer Institute.

                                       20

<PAGE>

OVERVIEW OF ONCOLOGY AND IMMUNOLOGY

Our clinical and  commercial  focus is to produce a portfolio of highly  potent,
selective  drugs that have the  potential  to  regulate  the  overproduction  of
TNF(alpha) and are anti-angiogenic.

TNF(alpha),  produced primarily by certain white blood cells, is one of a number
of proteins called cytokines that act as chemical messengers throughout the body
to regulate  many  aspects of the immune  system.  TNF(alpha)  is  essential  to
mounting an inflammatory response, which is the normal immune system reaction to
infection  or injury that rids the body of foreign  agents and  promotes  tissue
repair.  However,  chronic  or  excessive  production  of  TNF(alpha)  has  been
implicated in a number of acute and chronic inflammatory diseases. These disease
states,  which  are  inadequately  treated  with  existing  therapies,   include
non-insulin dependent diabetes,  Alzheimer's disease,  congestive heart failure,
inflammatory bowel disease, rheumatoid arthritis,  cancer cachexia,  Parkinson's
disease, multiple sclerosis and lupus.

Traditional therapies for these disease states include  anti-inflammatory  drugs
and immunosuppressive  agents. These therapies often fail to achieve significant
clinical  benefits  and can cause  serious  side effects such as severe drops in
certain blood component counts, liver toxicity, osteoporosis, teratogenicity and
various  endocrine  abnormalities.  We believe that selective down regulation of
TNF(alpha) represents a promising new strategy for treating chronic inflammatory
diseases. In pursuit of this strategy,  two broad classes of compounds have been
investigated: proteins and small synthetic molecules.

Anti-TNF(alpha) proteins,  including  anti-TNF(alpha)  antibodies and TNF(alpha)
soluble receptors,  have demonstrated  efficacy in the treatment of such chronic
inflammatory diseases as rheumatoid arthritis and Crohn's disease. While initial
doses of these  anti-TNF(alpha)  proteins  have  been  well  tolerated  and have
reduced disease  activity in clinical  studies,  these proteins  exhibit certain
shortcomings linked to their nature as proteins. First, they are large molecules
that must currently be injected or infused.  Second, the period of efficacy of a
given dosage of a protein-based  drug can decline with repeated  administration,
rendering  protein-based drugs more suitable for treatment of acute pathological
conditions rather than chronic disease states. This limitation is due in part to
increasing production by a patient's immune system of antibodies that neutralize
administered proteins.

There are a number of large molecule,  protein-based  therapeutic products under
development  by other  companies  for  TNF(alpha)  modulation.  One  product has
received  approval  from  the FDA for  the  treatment  of  Crohn's  disease  and
rheumatoid   arthritis,   and  another  has  received  approval  for  rheumatoid
arthritis.  Synthetic small molecule drugs, however, if successfully  developed,
may prove to be preferable in the  treatment of chronic  inflammatory  diseases,
due to factors  such as oral  dosing,  lower cost of therapy  and  avoidance  of
undesirable  immune  response  that  results in adverse side effects and reduced
efficacy.  We believe that our small molecule  immunotherapeutic  compounds have
the potential to selectively modulate TNF(alpha) while affording these benefits.

In addition,  research has indicated that our small molecule drug, THALOMID,  is
anti-angiogenic. Angiogenesis is the fundamental biological process by which new
blood vessels are formed. Cancer cells require oxygen and nutrients and initiate
a biochemical  mechanism that stimulates  angiogenesis  which, in turn, provides
the cancerous cells with the blood supply that they need to grow.  Inhibition of
angiogenesis  could  adversely  affect  the graft of a tumor and be a  potential
anti-cancer  therapy.  This  therapy  could  be also  used in  conjunction  with
radiation or more traditional  chemotherapeutic  agents.  Currently, a number of
anti-angiogenic agents are being developed by a number of companies. However, we
believe  that  THALOMID is the only product on the market that can have a direct
anti-angiogenic effect. Moreover, preliminary research suggests that our two new
classes of small molecule  immunotherapeutic  compounds -- one of which is based
on thalidomide's activity -- may be anti-angiogenic.

THALOMID

In July 1998,  we received FDA approval to market  THALOMID for treatment of ENL
and the product was launched in late September 1998.  THALOMID is the first drug
approved under a special "Restricted  Distribution for Safety" regulation and is
distributed  through our S.T.E.P.S. program.  Our program is designed to support
the  safe  and  appropriate  use of  THALOMID  and has  been  made a part of the
approved  labeling for THALOMID.  We are currently  developing  THALOMID for the
treatment of a variety of serious  disease states for which we believe there are
currently  no adequate  approved  therapies.  Our current  intent is to seek FDA
approval  for  THALOMID  for at least one cancer of the blood,  such as multiple
myeloma, one solid tumor cancer and an AIDS-related indication.

The  immunological  and   anti-angiogenic   properties  of  THALOMID  are  being
investigated  as the basis for treatment of a variety of  oncological  diseases,
and a number  of  trials  are  ongoing,  some in  cooperation  with the NCI,  to
evaluate  the  potential  of the  drug in  cancer.  Key  investigations  include
multiple myeloma, which was the subject of an article and

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editorial in the November 18, 1999 issue of The New England Journal of Medicine,
Volume 341, Number 21, and glioblastoma multiforme,  for which initial data were
presented in November 1999 at the Chemotherapy  Foundation Symposium XVII in New
York.  Additional  presentations  have  been made at the 41st ASH  symposium  in
December 1999.

Our work with  thalidomide  was originally  based on a scientific  collaboration
with  The  Rockefeller   University's  Laboratory  of  Cellular  Physiology  and
Immunology.  In the  early  1990s,  researchers  at The  Rockefeller  University
discovered  that  thalidomide  is  a  selective  modulator  of  TNF(alpha)  and,
therefore,  could be of potential benefit in many serious immune-related disease
states, including cachexia and other AIDS-related  conditions.  We believe that,
in serious and debilitating  disease states, the risk of birth defects and other
potential  side  effects  related to  thalidomide  is  outweighed  by the drug's
potential  clinical  benefits.  The  Rockefeller  University  has  granted to us
certain  exclusive rights and licenses to manufacture,  use and sell thalidomide
for treating the toxicity  associated with high  concentrations of TNF(alpha) in
septic  shock,  cachexia and  HIV-related  disease  states.  Researchers  at the
Children's  Medical  Center,   which  is  affiliated  with  Harvard  University,
discovered  that  thalidomide  is  anti-angiogenic  and  filed  patents  on this
utility.  These patents, some of which have not issued in the United States, are
exclusively  licensed to EntreMed,  Inc. We were granted an exclusive sublicense
to all of EntreMed's thalidomide patents in December 1998.

As a result of our own applications and designations  acquired from EntreMed, we
now have Orphan Drug  designations from the FDA for THALOMID  covering:  primary
brain malignancies;  HIV associated wasting syndrome;  severe Recurrent Aphthous
Stomatitis, or RAS, in severely, terminally immunocompromised patients; clinical
manifestations of mycobacterial infections caused by Mycobacterium  tuberculosis
and  non-tuberculous  mycobacteria;  ENL; multiple myeloma;  Crohn's disease and
Kaposi's sarcoma. If the FDA approves any of these indications for THALOMID,  we
will be granted a seven-year period of exclusivity  during which time the FDA is
prohibited,  except under some  conditions,  from approving  another  version of
thalidomide for the approved indication.

Thalidomide  was  developed  initially  as  a  sedative,  and  was  also  widely
prescribed  by doctors in Europe in the late 1950s and early  1960s to  pregnant
women for relief of morning  sickness.  After  severe  birth  defects were later
observed with use of the drug,  it was virtually  removed from the world market.
Thalidomide was later discovered to have therapeutic effects in the treatment of
ENL, a disease that is rare in the United States but common in many parts of the
developing  world.  Although  the  FDA  had  never  approved  the  marketing  of
thalidomide,  the U.S.  Public  Health  Service has  dispensed  the drug for the
treatment of ENL for the past 25 years. We note that  thalidomide's  history may
limit market acceptance of THALOMID.

Oncology

Cancer  tissue  has  many  blood  vessels.  This  observation  has  led  to  the
realization that growth of blood vessels is essential for tumor growth, invasion
and metastasis.  Specifically,  developing  solid primary tumors are believed to
remain clinically  insignificant  unless they can arrange to obtain  nourishment
from their host.  Biochemically,  an  invasive  tumor acts by altering a complex
system of factors causing the formation of new blood vessels from existing ones.
Almost three decades ago, it was proposed that this tumor  angiogenesis could be
a target of cancer therapy.  Anti-angiogenic  compounds were believed to be able
to work by reducing or halting  remaining tumor growth and could also be used in
conjunction  with more  traditional  chemotherapeutic  agents.  Thalidomide  was
discovered to be anti-angiogenic at the Children's Medical Center in Boston.

We are currently working with the NCI and a number of clinical  investigators to
assess the  potential of THALOMID in the  treatment of various  cancers.  In the
first 12 months after THALOMID was  commercially  launched in the United States,
approximately 70% of the product's  prescriptions were in oncology,  as reported
by prescribers on our S.T.E.P.S. program enrollment surveys.

Multiple  Myeloma. Multiple myeloma is a malignant proliferation of plasma cells
and plasmacytoid  cells. It is the second most common blood borne malignancy and
is  invariably  fatal.  According to the Leukemia  Society of America,  multiple
myeloma accounts for about 13% of blood borne disease and affects  approximately
40,000  people  in  the  United  States.   The  incidence  of  this  disease  is
approximately  four per  100,000,  and  approximately  14,400 cases are reported
annually  with  approximately  11,000 deaths  associated  with the disease every
year.

Clinical research  published in the November 18, 1999 edition of The New England
Journal  of  Medicine,  Volume  341,  Number  21,  reported  results  of a study
conducted  at the  University  of Arkansas on the use of THALOMID in 84 multiple
myeloma  patients with advanced  stage disease and histories of extensive  prior
chemotherapeutic  interventions,  radiation  treatments and multiple bone marrow
transplants.  This Phase II study found that 32% of the  patients  had a partial
response

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<PAGE>

and 10% of the patients  had a complete or nearly  complete  remission  based on
decreases in paraprotein, the myelomaprotein in serum, or Bence Jones protein in
urine,  important markers of the progression of the disease.  Clinical data from
180 patients in this study was  presented  at the  December  1999 ASH meeting by
researchers  at the University of Arkansas who reported that 36% of the patients
achieved a 25% reduction in tumor burden. Eighteen patients achieved paraprotein
response  of at least  90%,  14  patients  achieved  at least a 75%  paraprotein
response,  16 patients  achieved at least a 50%  paraprotein  response  and four
patients   achieved  a  complete   response.   Side  effects   reported  by  the
investigators were constipation,  weakness/fatigue  and somnolence.  A number of
additional  presentations and posters presented confirmatory evidence at the ASH
meeting regarding the efficacy of THALOMID.  In September 1999, similar findings
were reported at the  International  Myeloma  Workshop in  Stockholm,  Sweden on
trials conducted at Cedars-Sinai  Medical Center, Los Angeles. In this Phase II,
open label  study of 20  relapsing  or  progressive  multiple  myeloma  patients
utilizing low-dose THALOMID administered over an eight-week trial period, 30% of
patients experienced a greater than 50% reduction of tumor burden.  Further data
confirming earlier trials was presented at the Chemotherapy Foundation Symposium
XVII in November  1999 in New York on 15  refractory  patients  treated at Saint
Vincents  Medical  Center,  New York in which  there was  observed a 67% overall
response with THALOMID alone or in combination with chemotherapy.

In the 12 months following the launch of THALOMID, as reported by prescribers on
our S.T.E.P.S. program enrollment surveys,  approximately 30% of total usage was
in multiple  myeloma.  Based on this  information  and on the growing  volume of
clinical trial data, our plan is to develop a regulatory/clinical  program based
on what has been  learned  from these  studies and file a  supplemental  NDA for
THALOMID for the treatment of multiple myeloma.

Glioblastoma  Multiforme.  Glioblastomas  are  the  most common brain tumors and
account for 50% of all gliomas,  an aggressive  form of brain cancer.  The usual
treatment  of  high-grade  gliomas is surgical  removal  followed  by  radiation
therapy.

Studies at the New York  University  School of  Medicine  and at the Dana Farber
Institute  have  demonstrated  the potential for  thalidomide as a treatment for
glioblastoma multiforme. Phase I/II data from the New York University trial were
presented in November 1999 at the Chemotherapy  Foundation Symposium XVII in New
York.  THALOMID in combination  with carboplatin was administered to 71 patients
with  recurrent  glioblastoma  multiforme.  At the  maximum  tolerated  dose  of
THALOMID, 53 of the patients were evaluated for efficacy,  with 70% experiencing
responses,  two with  partial  responses,  35 with  disease  stabilization.  The
trial's most commonly reported side effects were constipation and drowsiness.  A
Phase III trial will assess  whether  patients  benefited  because of the higher
carboplatin  doses  or  if  there  was  any  synergy  between   thalidomide  and
carboplatin.  Additionally, a Phase II trial has been initiated in collaboration
with the NCI's  Radiation  Therapy  Oncology Group to investigate  the effect of
THALOMID and radiation as co-therapy for the treatment of glioblastoma.

Other  Oncology  Indications. In addition to glioblastoma multiforme, the NCI is
currently  investigating  THALOMID in clinical  trials on prostate,  colorectal,
head and neck and  non-small  cell lung  cancer.  Other  trials such as those in
liver  cancer,  kidney  cancer and leukemia are being run by key  investigators.
Recently,  researchers in London reported that continuous,  low-dose thalidomide
is useful as an agent in patients  with advanced  cancers as a palliative.  That
study showed that three of 18 patients with kidney cancer also showed a response
benefit and three patients had  stabilization of their disease for periods of up
to six months.  In addition,  four of 17 melanoma  patients  experienced  stable
disease  for up to six  months.  According  to a report in the  medical  journal
Lancet,  follow-up  studies  using  higher  doses have also  shown  "encouraging
results"  in patients  with kidney  cancer.  These  researchers  are now testing
thalidomide  in  combination  with  interferon  or  interleukin 2 in this group.
Similarly, the NCI reported trial results in which 63 patients were treated with
either a low dose or a high dose of  thalidomide.  Approximately  53% of the low
dose and 68% of the  high  dose  patients  had  declines  in  prostate  specific
antigen,  a recognized marker for prostate cancer. If successful,  these studies
would establish proof of principle,  leading to the design of additional trials,
including pivotal studies.

Immunology

THALOMID  has been shown to impact the immune  system both in vitro and in vivo.
Examples of such  biological  activities  include the  inhibition of TNF(alpha),
stimulation  of the  anti-inflammatory  cytokine  IL-10 and activation of T-cell
function. These types of activities could prove to have therapeutic benefit in a
variety of inflammatory,  infectious and autoimmune diseases.  The two key areas
of  investigation  at present  involve  inflammatory  bowel  disease and serious
complications   associated   with   HIV/AIDS.   In  addition,   other  areas  of
investigation  include  sarcoidosis,  an inflammation of body tissue which often
attacks the lungs and lymph nodes, and scleroderma, a chronic tissue disorder.

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<PAGE>

Erythema  Nodosum  Leprosum.  ENL  is  a  complication  of  leprosy,  a  chronic
bacterial disease. Although the disease is relatively rare in the United States,
leprosy afflicts millions worldwide. ENL occurs in about 30% of leprosy patients
and is  characterized  by  cutaneous  lesions,  acute  inflammation,  fever  and
anorexia. On July 16, 1998, we received approval from the FDA to market THALOMID
for the treatment of ENL.

Inflammatory  Bowel  Disease. According to the Crohn's and Colitis Foundation of
America,  there are approximately one million Americans with active inflammatory
bowel disease.  Inflammatory  bowel disease is  characterized by serious chronic
inflammation of the wall or any part of the  gastrointestinal  tract and results
in pain, bloating and diarrhea. In addition, the chronic inflammation may result
in abscesses and fistula formation.  The most serious form of inflammatory bowel
disease is known as Crohn's  disease  with an  estimated  70,000 to 125,000 U.S.
patients diagnosed with active moderate to severe manifestation of the disease.

A Phase II pilot study using  THALOMID in patients with severe  Crohn's  disease
has been concluded at the Cedars-Sinai Medical Center, Los Angeles, and reported
in the  journal  Gastroenterology.  About  70% of the  patients  suffering  from
moderate  to severe  Crohn's  disease who  completed  at least five weeks of the
12-week trial demonstrated a response when treated with low dose THALOMID,  with
20% of these patients experiencing  remission.  All patients were able to reduce
their  steroid  regimen  by at least  50%,  with 44% of  patients  discontinuing
steroids.  Data from this trial  suggests  that  THALOMID  may provide  clinical
benefit and potentially reduce the need for steroid treatment.  This combination
of effects could mean improvement over current  therapeutic  options.  A similar
Phase II pilot study has been  initiated at  Cedars-Sinai  Medical  Center using
THALOMID for chronically  active  ulcerative  colitis,  which is another form of
inflammatory bowel disease. Estimates of the prevalence of ulcerative colitis in
the  United  States   generally  range  between  250,000  and  500,000.   Recent
preliminary  data has shown that eight of 11  patients  with  intractable  bowel
disease benefited from THALOMID.

HIV/AIDS.  Recurrent  Aphthous  Stomatitis,  or  RAS,  is a complication of AIDS
characterized  by lesions of the oral  cavity,  esophagus  and  gastrointestinal
tract and may interfere with normal eating. We believe RAS currently afflicts an
estimated 5,000 AIDS patients in the United States.  Positive  results have been
reported in a study  conducted by the AIDS Clinical Trials Group of the National
Institutes of Health using a formulation of thalidomide  manufactured by a third
party. In mid-1997,  we began a pivotal clinical trial involving 84 patients for
the  evaluation  of THALOMID in the treatment of RAS,  using the same  principal
investigator  as the AIDS Clinical Trials Group study. We will be analyzing this
clinical trial data in 2000 with a view toward the possibility of a supplemental
NDA submission to the FDA.

S.T.E.P.S. Program

Working with the FDA and other governmental agencies as well as certain advocacy
groups,  we designed and  implemented our S.T.E.P.S.  program,  the objective of
which is the safe and  appropriate  use of THALOMID.  This  proprietary  program
includes  comprehensive  physician,  pharmacist  and patient  education.  Female
patients  are  required  to use  contraception  and are  given  pregnancy  tests
regularly.  All  patients  are also  subject  to other  requirements,  including
informed consent and  participation in a confidential  outcomes registry managed
on our behalf by an academic  epidemiology  research group.  Physicians are also
required  to comply with the  educational,  contraception  counseling,  informed
consent and  pregnancy  testing and other  elements of the  program.  Dispensing
pharmacists  are  required  to  confirm  that  the  physician  is  a  registered
participant in the program, and that the patient has signed an informed consent.
Automatic  refills are not permitted under the program and each prescription may
not exceed four weeks dosing. A new prescription is required each month.

Sales and Commercialization

We have  established an  organization  of  approximately  60 persons to sell and
commercialize  THALOMID.  These individuals have considerable  experience in the
pharmaceutical   industry  and  many  have  experience   with   oncological  and
immunological   products.   We  expect  to  expand   our   THALOMID   sales  and
commercialization  group to support products we develop to treat oncological and
immunological diseases. We intend to market and sell the products we develop for
indications with accessible patient populations. For drugs with indications with
larger patient populations,  we anticipate  partnering with other pharmaceutical
companies.  In addition,  we are positioned to accelerate the expansion of these
sales  resources as appropriate to take  advantage of product  in-licensing  and
product   acquistion   opportunities.   We   intend  to   establish   commercial
relationships with selected companies in other countries to market THALOMID.

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Manufacturing

THALOMID is formulated and encapsulated for us by Penn  Pharmaceuticals  Ltd. of
Great Britain in an FDA approved facility devoted  exclusively to the production
of THALOMID  capsules.  Both the bulk  manufacturing  facility that produces the
drug  substance for THALOMID and the Penn  facility have been  certified as cGMP
compliant.  In certain instances, we may be required to make substantial capital
expenditures to access additional  manufacturing  capacity. In addition, we have
established a contract with another cGMP certified bulk drug substance  supplies
for THALOMID that will begin in 2001 once the  regulatory  process is completed.
We are also actively  seeking an alternate  manufacturer  to provide  additional
capacity for the formulation and  encapsulation of THALOMID and expect that this
will be concluded in 2000.

IMIDS

We have  designed  and  synthesized  a number of novel  structural  analogues of
thalidomide  called IMiDs which have been  demonstrated  in in vitro tests to be
substantially more potent than thalidomide.  There can be no assurance, however,
that the same effect can be duplicated in humans.  Animal models have  suggested
that our  IMiDs do not  cause the birth  defects  associated  with  thalidomide.
Research on these  compounds has identified  two clinical  trial  candidates and
each  has  advanced  into a Phase  I  trial.  Research  continues  on  follow-on
compounds with enhanced  immunological and anti-angiogenic  activity.  IMiDs may
have  potential  for treating  conditions  where there is a deficiency in T-cell
activity,  such  as  viral  diseases  including  HIV-related  diseases,  or  for
enhancing  potential  IL-12  mediated  anti-tumor  activities.   In  preclinical
studies, our lead IMiD compound has been shown to inhibit interleukins 1-beta, 6
and 12 while  stimulating  the  production of  interleukins  10 and 2 as well as
interferon  gamma.  The  activity of T-cells is  enhanced by the  compound up to
1,000 times more than with thalidomide. We expect to advance at least one of the
lead IMiDs,  CC 5013 or CC 4047,  into a Phase II pilot trial in a blood  cancer
during 2000.  The U.S.  Patent and Trademark  Office has issued  composition  of
matter and use patents to us relating to our IMiDs.

SELCIDS

We have  designed,  synthesized  and  tested a large  number of  SelCIDs.  These
compounds  have  demonstrated  the ability to be highly  specific  inhibitors of
TNF(alpha)  overproduction in in vitro bioassays of human cells.  SelCIDs appear
to  have a  specific  inhibitory  effect  on  PDE  4,  which  is  linked  to the
overproduction  of TNF(alpha).  Studies have determined that many of the SelCIDs
decrease  synthesis  of  TNF(alpha)  through  selective  inhibition  of  PDE  4.
Preclinical  and animal  tests have  shown this class of  compounds  to be up to
10,000 times more active with a longer half-life than THALOMID.  We believe that
control of TNF(alpha) at its source, versus simple removal of circulating levels
of  the  cytokine,   may  facilitate  more  effective   therapy  without  immune
suppression.  There can be no  assurance,  however,  that the same effect can be
duplicated in humans.

Our lead SelCID,  CDC 801, was found to be well  tolerated in two Phase I trials
completed  in 1999 in the  United  Kingdom.  A Phase  II  pilot  trial  for this
compound in Crohn's disease commenced in 1999 at the Cedars-Sinai Medical Center
and results are expected in the first quarter of 2000. In addition, we expect to
initiate a Phase II pilot trial for CDC 801 in a blood cancer during 2000. Other
SelCIDs  have  been  identified  and the most  advanced  of these is  undergoing
toxicological  evaluation in  preparation  for the initiation of Phase I trials.
Unlike  many  therapeutics  which  inhibit  PDE 4,  SelCIDs  have not  shown any
evidence of acute nausea and vomiting in patients. The U.S. Patent and Trademark
Office has issued to us  composition  of matter and use patents  relating to our
SelCIDs.

CHIRAL CHEMISTRY

Many  human   pharmaceuticals   and   agrochemicals   exist  in  two   different
three-dimensional  configurations  that are identical in chemical  structure but
are mirror images of each other. These conformations,  known as enantiomers,  or
isomers,  generally interact  differently with biological  targets.  In clinical
applications,  one  isomer  may  result  in the  desired  therapeutic  effect by
stimulating or inhibiting a targeted biological function, while the other isomer
may be  inactive  or cause  undesirable  side  effects.  In  contrast to racemic
compositions   which   contain   both   isomers,   the  use  of  chirally   pure
pharmaceuticals  can result in  significant  clinical  benefits  such as reduced
toxicity  and  increased  efficacy.  In  agrochemical  applications,  the use of
chirally pure chemicals can result in a substantially  reduced volume of product
required  to  achieve  the  desired  benefit,   thereby   potentially   lowering
manufacturing  costs and  reducing  the  environmental  burden as compared  with
racemic chemicals.

Our  biocatalytic  process  enables the  efficient  production  of chirally pure
compounds. This patented process is based primarily on the use of enzymes called
aminotransaminases,  which are  optimized by us through a variety of  techniques
including genetic engineering. These enzymes catalyze the production of only the
desired  stereoisomer  of a  chiral  compound  and can be  used in  conventional
chemical synthesis reactors at room temperature.

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Our biocatalytic  process for producing chirally pure compounds differs from the
more common approach of producing racemic mixtures followed by separation of the
desired  stereoisomer  through resolution  techniques such as crystallization or
chromatography.   These  traditional   approaches  to  producing  chirally  pure
compounds can be cumbersome,  result in low yields,  use substantial  amounts of
raw  materials  and  involve  the  disposition  of  waste  product.  Traditional
approaches also are generally less economical than our process.  We believe that
our biocatalytic  process can be applied to the manufacture of a wide variety of
organic chemicals.

We  believe  there  is  a  significant  incremental  opportunity  in  developing
selected,  chirally pure versions of approved  drugs  currently  sold in racemic
form.  Compounds that have been approved and marketed have a significant body of
information regarding their safety and efficacy and consequently:

o    the cost and duration of preclinical evaluations and clinical trials may be
     reduced if  reference  may be made to data used in the course of  obtaining
     regulatory approval for the racemic parent compound;

o    the risk of not obtaining regulatory approval may be reduced; and

o    marketing risks may also be reduced due to the  established  market for the
     parent compound.

We have  made  significant  progress  over the past year in the  development  of
ATTENADE,  the chirally pure version of Ritalin.  We have also made  significant
progress in the  development and production of chirally pure  agrochemicals.  We
believe that the agrochemical market presents a substantial  opportunity because
many  agrochemicals  produced in racemic form could be  manufactured in chirally
pure form.

ATTENADE

We have  completed  two pivotal Phase III efficacy  trials for  ATTENADE.  These
trials found that ATTENADE met all efficacy parameters for controlling  symptoms
of ADD and ADHD in school-age children. Drugs containing dl-methylphenidate such
as Ritalin  have been used for decades  for the  treatment  of ADD and ADHD.  We
believe  that one  million  children  in the United  States  were  treated  with
dl-methylphenidate  and other psychostimulants in 1998. Total U.S. sales in 1998
of drugs  used to treat the  symptoms  of ADD and ADHD were  approximately  $500
million.

More than 200 children  participated  in our pivotal trials.  Both  multi-center
trials  compared  ATTENADE to placebo;  the second trial  directly  compared the
efficacy of both  ATTENADE  and  dl-methylphenidate  to placebo.  As compared to
placebo,  ATTENADE  demonstrated a statistically  significant longer duration of
action than dl-methylphenidate. ATTENADE controlled the symptoms of ADD and ADHD
at all times measured in the study while  dl-methylphenidate did not control the
symptoms at the last  measurement.  In both  trials,  behavioral  and  objective
measures were examined. ATTENADE had favorable scores over dl-methylphenidate in
all parameters measured.  The results of the primary efficacy analysis indicated
that ATTENADE was  significantly  more  effective than placebo as evaluated by a
behavioral  scale,  signifying  an  improvement  in the  clinical  status of the
children.  The results of the second  trial  confirmed  the drug's  efficacy and
indicated a  significantly  longer  duration of action for ATTENADE  compared to
dl-methlyphenidate as measured by a behavioral scale. The Phase III safety trial
is scheduled for  completion in the first quarter of 2000 and an NDA  submission
is  anticipated  later  in  the  year.  Clinical  trials  on  a  pulsed  release
formulation are planned to commence in the first half of 2000.

We are in discussions  regarding  partnerships for ATTENADE in the United States
and Europe. In Canada, where it is awaiting  registration,  ATTENADE is licensed
to Biovail Corporation,  which purchased $2.5 million dollars worth of our stock
and will pay to us licensing  fees,  milestone  payments and royalties.  We have
been issued  patents for the use of ATTENADE for the  treatment of ADD and ADHD,
and for the once-a-day  administration of methylphenidate  drugs in a controlled
or  pulsed   release   formulation   that   includes   both  the  chirally  pure
d-methylphenidate and the racemic form. In addition, we have been issued process
patents covering our manufacturing process for the active substance.

Chirally Pure Agrochemicals

Celgro  is  applying  our  proprietary   biocatalytic  synthesis  technology  to
agrochemicals. Celgro's approach is to work with agrochemical companies to adapt
our  biocatalytic  technology  to the  manufacture  of chirally pure versions of
their existing crop protection  product and then license the technology to these
companies in exchange for royalties.  Celgro will also seek to develop  chirally
pure versions of existing  agrochemicals  on its own and then enter into license
agreements with third

                                       26

<PAGE>
parties, who would manufacture and sell the agrochemicals.  We expect that these
arrangements  typically  will  include  milestone  payments,   reimbursement  of
research and development expenses and royalty arrangements. We have entered into
research and development  agreements with two leading agrochemical companies and
initiatives are underway to secure additional collaborations.

We also  believe  that our chiral  technology  can be enabling  in  agrochemical
applications  because it has the potential to significantly  lower manufacturing
costs  compared to  conventional  technologies  and other  chiral  technologies.
Compared to our biocatalytic process, conventional technologies require more raw
materials and greater plant capacity to produce the same  effective  quantity of
product,  while other chiral technologies  require specialized  equipment,  more
expensive  chiral  agents,  more raw material and greater  capacity for handling
hazardous  wastes  produced  in  the  separation  process.  In  addition,  it is
anticipated that the required  application  amount of a chirally pure form of an
agrochemical  could be substantially  less than the racemic form and achieve the
same or better results, thereby reducing environmental burden. Agrochemicals are
highly price  sensitive and,  therefore,  a process that produces  chirally pure
products at significant cost savings could be in substantial demand.

PATENTS AND PROPRIETARY TECHNOLOGY

Patents and other  proprietary  rights are important to our business.  It is our
policy to seek patent protection for our inventions, and also to rely upon trade
secrets,   know-how,   continuing   technological   innovations   and  licensing
opportunities to develop and maintain our competitive position.

Under an agreement with The  Rockefeller  University,  we have obtained  certain
exclusive rights and licenses to manufacture,  have  manufactured,  use and sell
products that are based on compounds  that were  identified in research  carried
out by The  Rockefeller  University and us, that have activity  associated  with
TNF(alpha).  The  Rockefeller  University  has  identified  a  method  of  using
thalidomide  and certain  thalidomide-like  compounds to treat certain  symptoms
associated  with  abnormal   concentrations   of  TNF(alpha),   including  those
manifested in septic shock, cachexia and HIV infection. In 1995, The Rockefeller
University was issued a U.S. patent which claims such methods.  This U.S. patent
expires in 2012 and is included in the patent rights exclusively  licensed to us
under the license from The  Rockefeller  University.  However,  The  Rockefeller
University did not seek corresponding patents in any other country in respect of
this invention.  The Rockefeller  University has filed an additional U.S. patent
application and an international  patent application relating to the activity of
thalidomide  related to  interleukin-12.  Under the license from The  Rockfeller
University,  we  were  obligated  to  pay  certain  specified  royalties  to The
Rockefeller   University   on  net  sales  of  licensed   products  for  covered
indications.  In November  1999,  we agreed with The  Rockefeller  University to
substitute  a lump sum  payment  and  issue  stock  options  to The  Rockefeller
University and the inventors in lieu of the royalties  previously  payable under
the license. The license from The Rockefeller University is coterminous with the
last to expire of the  licensed  patents and is  terminable  by The  Rockefeller
University  only in the event of a breach of the  agreement's  terms by us which
breach shall fail to be remedied for more than sixty days after notice  thereof.
Any  termination  of the license from The  Rockefeller  University  could have a
material  adverse  effect on our  business,  financial  condition and results of
operations.

In 1998,  we were  granted an  exclusive  sublicense  to all of the  thalidomide
patents and patent applications  worldwide,  exclusively licensed to EntreMed by
the  Children's   Medical  Center  Corp.,   which  is  affiliated  with  Harvard
University,  related to the  anti-angiogenic  action of thalidomide.  Three U.S.
patents  issued to Children's  Medical  Center Corp.  which will expire in 2014.
Corresponding   foreign  patent   applications   and  additional   U.S.   patent
applications are still pending.  Further,  we have also exclusively  sublicensed
pending U.S. and foreign patent  applications  related to the use of thalidomide
in combination  with other  therapeutic  agents.  There can be no assurance that
additional  patents will issue, or that if patents issue, that such patents will
provide us with significant proprietary protection or commercial advantage.  The
license  from  EntreMed is  coterminous  with the last to expire of the licensed
patents  and we must  pay  royalties  for at  least  12  years  from  our  first
commercial sale in the United States.  The EntreMed license is terminable in the
event of a breach by us,  which  breach  shall fail to be  remedied  for 60 days
after notice thereof.  Any termination of the license from EntreMed could have a
material  adverse  affect on our  business,  financial  condition and results of
operations.

We have been issued a total of 36 U.S.  patents and have filed an  additional 15
U.S. patent  applications.  Of the issued patents, 14 relate to our oncololic or
immunologic   compounds  and  uses  and  six  are  directed  to  methylphenidate
therapeutic compositions and processes. Our U.S. patents expire between 2001 and
2019. We have filed patient  applications  and in some  instances  have obtained
patents in certain other countries which  correspond to some, but not all of our
U.S. patents. We expect to continue to file patent applications covering the use
of our proprietary inventions.

                                       27
<PAGE>

Prior to the enactment in the United States of new laws adopting certain changes
mandated by the General  Agreement on Tariffs and Trade,  the  exclusive  rights
afforded by a U.S.  patent were for a period of 17 years  measured from the date
of grant.  Under  these  new laws,  the term of any U.S.  patent  granted  on an
application  filed  subsequent to June 8, 1995 will  terminate 20 years from the
date on which the patent application was filed in the United States or the first
priority date,  whichever occurs first. Future patents granted on an application
filed  before June 8, 1995 will have a term that  terminates  20 years from such
date, or 17 years from the date of grant, whichever date is later.

Under the Drug Price Competition and Patent Term Restoration Act of 1984, a U.S.
product  patent or use patent may be extended for up to five years under certain
circumstances  to  compensate  the patent  holder for the time  required for FDA
regulatory review of the product. The benefits of this act are available only to
the first  approved use of the active  ingredient in the drug product and may be
applied only to one patent per drug product.  There can be no assurance  that we
will be able to take advantage of this law.

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 its business without  infringing the proprietary rights of
others.  The  patent  positions  of  pharmaceutical  and  biotechnology   firms,
including  ours,  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,  be circumvented or be infringed by others.
Since patent  applications  in the United States are maintained in secrecy until
patents issue and since  publication  of discoveries in the scientific or patent
literature  often lag behind  actual  discoveries,  we cannot be certain that we
were the first to make the  inventions  covered  by each of our  pending  patent
applications  or that we were the  first to file  patent  applications  for such
inventions.  In the event a third  party has also  filed a patent for any of its
inventions,  we may have to participate in interference  proceedings declared by
the U.S. patent and Trademark Office to determine  priority of invention,  which
could result in the loss of a U.S.  patent or loss of any  opportunity to secure
U.S.  patent  protection  for the  invention.  Even if the  eventual  outcome is
favorable to us, such interference  proceedings could result in substantial cost
to us.  Prosecution  of patent  applications  and  litigation  to establish  the
validity and scope of patents,  to assert  patent  infringement  claims  against
others  and to defend  against  patent  infringement  claims  by  others  can be
expensive and time-consuming.  There can be no assurance that, in the event that
claims of any of our owned or  licensed  patents are  challenged  by one or more
third  parties,  any court or patent  authority  ruling on such  challenge  will
determine that such patent claims are valid and enforceable.  An adverse outcome
in such litigation  could cause us to lose  exclusivity  relating to the subject
matter  delineated by such patent claims and may have a material  adverse effect
on our business.  If a third party is found to have rights covering  products or
processes  used by us,  we could  be  forced  to cease  using  the  products  or
processes covered by the disputed rights, subject to significant  liabilities to
such third party and/or required to license  technologies from such third party.
Also,  different  countries have different  procedures for obtaining patents and
patents issued by different  countries  provide  different degrees of protection
against the use of a patented  invention by others.  There can be no  assurance,
therefore,  that the  issuance  to us in one  country  of a patent  covering  an
invention  will be  followed  by the  issuance  in other  countries  of  patents
covering the same invention or that any judicial interpretation of the validity,
enforceability  or scope of the claims in a patent issued in one country will be
similar to the judicial interpretation given to a corresponding patent issued in
another country. Furthermore, even if our patents are determined to be valid and
enforceable,  there can be no  assurance  that  competitors  will not be able to
design around such patents and compete with us using the  resulting  alternative
technology.  We do  not  currently  have,  nor  do we  intend  to  seek,  patent
protection relating to the use of THALOMID to treat ENL.

We also rely upon  unpatented,  proprietary and trade secret  technology that we
seek to protect,  in part, by confidentiality  agreements with our 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 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 or that such  technology will not be found to be  non-proprietary  or
not a trade secret.

GOVERNMENTAL REGULATION

Regulation by governmental  authorities in the United States and other countries
is a significant factor in the manufacture and marketing of pharmaceuticals  and
in our ongoing  research  and  development  activities.  All of our  therapeutic
products will require  regulatory  approval by  governmental  agencies  prior to
commercialization.  In  particular,  human  therapeutic

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<PAGE>

products are subject to rigorous  preclinical  testing and  clinical  trials and
other pre-marketing  approval requirements by the FDA and regulatory authorities
in other countries.  In the United States,  various  federal,  and in some cases
state  statutes and  regulations  also govern or impact upon the  manufacturing,
safety,  labeling,  storage,  record-keeping and marketing of such products. The
lengthy  process of  seeking  required  approvals  and the  continuing  need for
compliance with applicable statutes and regulations,  require the expenditure of
substantial resources. Regulatory approval, when and if obtained, may be limited
in scope which may  significantly  limit the indicated  uses for which a product
may be marketed.  Further,  approved drugs, as well as their manufacturers,  are
subject to ongoing review and discovery of previously unknown problems with such
products  may result in  restrictions  on their  manufacture,  sale or use or in
their  withdrawal  from the  market.  Any  failure by us, our  collaborators  or
licensees to obtain or maintain,  or any delay in obtaining regulatory approvals
could adversely affect the marketing of our products, and our ability to receive
product revenue, royalty revenue or profit sharing payments.

The activities  required before a  pharmaceutical  may be marketed in the United
States begin with preclinical testing not involving human subjects.  Preclinical
tests include  laboratory  evaluation of product chemistry and animal studies to
assess the potential safety and efficacy of a product and its formulations.  The
results  of  these  studies  must  be  submitted  to  the  FDA  as  part  of  an
Investigational New Drug application,  or IND, which must be reviewed by the FDA
primarily for safety  considerations  before proposed  clinical trials in humans
can begin. Typically, clinical trials involve a three-phase process.

In Phase I,  clinical  trials are  generally  conducted  with a small  number of
individuals  to  determine  the early  safety and  tolerability  profile and the
pattern of drug  distribution  and  metabolism  within the body.  If the Phase I
trials are  satisfactory,  Phase II clinical trials are conducted with groups of
patients in order to determine preliminary efficacy, dosing regimes and expanded
evidence of safety. In Phase III, large-scale,  multi-center, adequately powered
and well-controlled,  comparative clinical trials are conducted with patients in
effort to provide enough data for the  statistical  proof of efficacy and safety
required by the FDA and others. However, in some limited circumstances Phase III
trials may be  modified  to allow  evaluation  of safety and  efficacy in a less
regimented manner, which may allow us to rely on historical data relating to the
previous use of certain  pharmaceuticals.  In Phase IV,  confirmatory trials are
conducted after the FDA's approval of an NDA or issuance of an approvable letter
in order to resolve any open issues.  Monitoring  of all aspects of the study to
minimize  risks is a continuing  process.  Reports of all adverse events must be
made to the FDA.

The results of the preclinical  testing and clinical trials are submitted to the
FDA as part of an NDA for evaluation to determine if the product is adequate for
approval to commence  commercial  sales.  In  responding  to an NDA, the FDA may
grant marketing approval, request additional information or deny the application
if it determines that the application  does not satisfy its regulatory  approval
criteria.  When an NDA is approved, the manufacturer must establish a system for
obtaining  reports of experience and side effects that are  associated  with the
drug and make appropriate submissions to the FDA.

Pursuant to the Orphan Drug Act, a sponsor may request that the FDA  designate a
drug  intended to treat a "rare  disease or  condition"  as an "orphan  drug." A
"rare  disease or  condition"  is defined as one which affects less than 200,000
people in the United States or which affects more than 200,000  people,  but for
which the cost of development  and making  available the drug is not expected to
be recovered from sales of the drug in the United  States.  Upon the approval of
the  first  NDA  for  a  drug  designated  as an  orphan  drug  for a  specified
indication,  the sponsor of the NDA is entitled to exclusive marketing rights in
the United  States for such drug for that  indication  for seven  years.  Orphan
drugs may also be eligible for federal  income tax credits for costs  associated
with the drug's  development.  Possible  amendment of the Orphan Drug Act by the
United States Congress and possible  reinterpretation by the FDA are the subject
of  frequent  discussion.   FDA  regulations   reflecting  certain  definitions,
limitations  and procedures  initially went into effect in January 1993 and were
amended in certain respects in 1998. Therefore,  there is no assurance as to the
precise  scope of  protection  that may be afforded by orphan drug status in the
future or that the current level of  exclusivity  and tax credits will remain in
effect.  We have received from the FDA orphan drug approval for  thalidomide for
the treatment of: ENL; multiple myeloma; Crohn's disease; HIV associated wasting
syndrome;   clinical  manifestations  of  mycobacterial   infections  caused  by
Mycobacterium tuberculosis and non-tuberculous mycobacteria and RAS in severely,
terminally  immunocompromised patients. We also obtained orphan drug designation
in Kaposi's sarcoma and primary brain malignancies as part of our agreement with
EntreMed.  However,  there can be no assurance that another company also holding
orphan drug  designation  will not receive  approval  prior to us for the use of
thalidomide  for the treatment of one or more of these  indications,  other than
ENL. If that were to happen,  our  applications for that indication could not be
approved until the competing company's seven-year period of exclusivity expired.

Among the conditions for NDA approval is the  requirement  that the  prospective
manufacturer's quality control and manufacturing  procedures continually conform
with the FDA's cGMP. In complying with cGMP, manufacturers must devote

                                       29

<PAGE>

extensive  time,  money and effort in the area of production and quality control
and quality  assurance  to maintain  full  technical  compliance.  Manufacturing
facilities and company records are subject to periodic inspections by the FDA to
ensure compliance.

Steps  similar to those in the United  States must be  undertaken  in  virtually
every  other  country  comprising  the market for our  products  before any such
product can be commercialized in those countries. The approval procedure and the
time  required  for  approval  vary from  country  to  country  and may  involve
additional testing.  There can be no assurance that approvals will be granted on
a timely basis or at all. In addition, regulatory approval of prices is required
in most countries  other than the United States.  There can be no assurance that
the resulting prices would be sufficient to generate an acceptable return to us.

COMPETITION

The  pharmaceutical  and  agrochemical  industries  in which we compete are each
highly   competitive.   Our  competitors   include  major   pharmaceutical   and
biotechnology  companies,  most of which have  considerably  greater  financial,
technical and marketing resources than us. We also experience competition in the
development of our products and processes from  universities  and other research
institutions and, in some instances, compete with others in acquiring technology
from such sources.

Competition in the pharmaceutical industry, and specifically in the oncology and
immunology  areas  being  addressed  by us, is  particularly  intense.  Numerous
companies are pursuing  techniques  to modulate  TNF(alpha)  production  through
various  combinations of monoclonal  antibodies,  TNF(alpha) receptors and small
molecule  approaches.  Two  U.S.  companies,   Centocor  Inc.,  a  wholly  owned
subsidiary of Johnson & Johnson, and Immunex Corporation,  have registered drugs
that block the disease-causing  effects of TNF(alpha) in inflammatory  arthritis
and bowel disease.  Both drug products are registered  only in the United States
and have been  marketed  since 1998.  In the United  States the present  cost of
TNF(alpha)  modulating drugs, not including medical or other charges, is between
$7,000 and  $11,500 per  patient  year.  Both U.S.  companies  have  applied for
European registration of their products. Amgen Inc. is currently also developing
a soluble TNF(alpha) receptor. BASF A.G. has a human antibody in development and
Celltech  Group plc has a humanized  antibody.  In  addition,  a number of other
companies are attempting to address,  with other technologies and products,  the
disease  states  currently  being targeted by us.  EntreMed is  researching  the
effectiveness of its own thalidomide analogues as anti-angiogenic  agents in the
treatment  of retinal  disease and cancer.  Andrulis  Pharmaceuticals  Corp.,  a
small,  privately  held company,  is attempting to develop  thalidomide  for the
treatment of AIDS-related complications.

Several  companies have  established  chiral  products and chiral  technologies.
Sepracor Inc. and Chiroscience Group plc are actively  developing  chirally pure
versions of pharmaceuticals currently marketed in racemic form. Chiroscience has
completed  Phase I trials in the United  Kingdom for a chirally  pure version of
dl-methylphenidate  and is  working  with  Medeva  plc,  a leading  supplier  of
dl-methylphenidate  in the United  States,  towards full  clinical  development.
Chiroscience  has also taken  certain  steps to assert  patent  and  proprietary
rights  with  respect  to  its   formulation  of  a  chirally  pure  version  of
dl-methylphenidate.  The  agrochemical  market is large and, within this market,
efforts  are  underway  by  the  in-house  development  staffs  of  agrochemical
companies  to produce  chirally  pure  versions of their  existing  racemic crop
protection agents.

The pharmaceutical and agrochemical industries have undergone,  and are expected
to  continue  to  undergo,  rapid  and  significant  technological  change,  and
competition  is expected to intensify  as  technical  advances in each field are
made and become more widely known. In order to compete  effectively,  we will be
required  to  continually  upgrade  our  scientific  expertise  and  technology,
identify and retain capable management,  and pursue scientifically  feasible and
commercially viable opportunities.

Our  competition  will be  determined in part by the  indications  for which our
products are developed and  ultimately  approved by regulatory  authorities.  An
important factor in competition will be the timing of market introduction of our
or our competitors' products.  Accordingly, the relative speed with which we can
develop  products,  complete  clinical trials and approval  processes and supply
commercial quantities of products to the market will be expected to be important
competitive factors. Competition among products approved for sale will be based,
among other  things,  on product  efficacy,  safety,  convenience,  reliability,
availability, price and patent position.

EMPLOYEES

As of January 18, 2000, we had 148 full-time employees,  45 of whom were engaged
primarily in research  and  development  activities,  60 of whom were engaged in
sales and commercialization activities and the remainder of whom were engaged in
executive and administrative  activities.  Of these employees,  53 have advanced
degrees,  including  26 who have  Ph.D.  degrees.  We also  maintain  consulting
arrangements  with a number of  scientists  at  various  universities  and other
research institutions in Europe and the United States.

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<PAGE>

PROPERTIES

We lease a  44,500-square  foot  laboratory and office  facility in Warren,  New
Jersey, under a lease with an unaffiliated party, which has a term ending in May
2002 with one five-year renewal option,  and a 29,000-square foot facility which
has a term ending in July 2010 with two five-year renewal options. We also lease
an  18,000-square  foot laboratory and office facility in North  Brunswick,  New
Jersey,  under a lease with an  unaffiliated  party  which has a term  ending in
December 2009 with two five-year renewal options. We believe that our laboratory
facilities are adequate for our research and development activities for at least
the next 12 months.

LEGAL PROCEEDINGS

We are not engaged in any material legal proceedings.

                                       31

<PAGE>

                                  MANAGEMENT

DIRECTORS, OFFICERS AND KEY EMPLOYEES

<TABLE>
<CAPTION>

- --------------------------------------------------------------------------------------------
NAME                                       AGE    POSITION
- --------------------------------------------------------------------------------------------
<S>                                       <C>     <C>

John W. Jackson .......................    55     Chairman of the Board and Chief Executive
                                                  Officer
Sol J. Barer, Ph.D. ...................    52     President, Chief Operating Officer, Director
Robert J. Hugin .......................    45     Chief Financial Officer and Senior Vice
                                                  President
David I. Stirling, Ph.D. ..............    46     Chief Scientific Officer and Executive Vice
                                                  President - Pharmaceutical Research and
                                                  Development
Jerome B. Zeldis, M.D., Ph.D. .........    49     Chief Medical Officer and Vice President --
                                                  Medical Affairs
Joseph J. Day, Jr. ....................    58     Senior Vice President -- Planning and
                                                  Business Development
George W. J. Matcham, Ph.D. ...........    47     Senior Vice President -- Celgro
Steven D. Thomas, Ph.D. ...............    38     Vice President -- Regulatory Affairs and
                                                  Project Management
Bruce A. Williams .....................    45     Vice President -- Marketing and Sales
Jack L. Bowman ........................    67     Director
Frank T. Cary .........................    79     Director
Arthur Hull Hayes, Jr., M.D. ..........    66     Director
Gilla Kaplan, Ph.D. ...................    52     Director
Richard C.E. Morgan ...................    55     Director
Walter L. Robb, Ph.D. .................    71     Director
Lee J. Schroeder ......................    71     Director
</TABLE>

JOHN  W.  JACKSON has been our Chairman of the Board and Chief Executive Officer
since  January  1996.  From  February  1991  to  January  1996,  Mr. Jackson was
President  of  Gemini  Medical,  a  consulting  firm  that  he founded and which
specialized  in  services  and  investment advice to start-up medical device and
biotechnology  companies.  Previously,  Mr.  Jackson  had  been President of the
worldwide  Medical  Device Division of American Cyanamid, a major pharmaceutical
company,  from February 1986 to January 1991 and served in various international
positions, including Vice President--
International  for  American  Cyanamid  from 1978 to 1986. Mr. Jackson served in
several   human   health  marketing  positions  at  Merck  &  Company,  a  major
pharmaceutical  company,  from  1971 to 1978. Mr. Jackson received a B.A. degree
from Yale University and an M.B.A. from INSEAD, France.

SOL  J.  BARER,  PH.D.  has  been our President since October 1993 and our Chief
Operating  Officer  and one of our directors since March 1994. Dr. Barer was our
Senior  Vice  President  --  Science  and  Technology and Vice President/General
Manager  --  Chiral  Products  from  October  1990  to October 1993 and our Vice
President  -- Technology from September 1987 to October 1990. Dr. Barer received
a Ph.D. in organic and physical chemistry from Rutgers University.

ROBERT  J.  HUGIN has been our Senior Vice President and Chief Financial Officer
since  June  1999.  Previously,  Mr.  Hugin had been a Managing Director at J.P.
Morgan  &  Co.  Inc., which he joined in 1985. Mr. Hugin received an A.B. degree
from Princeton University and an M.B.A. from the University of Virginia.

DAVID   I.   STIRLING,   PH.D.   has   been  our  Executive  Vice  President  --
Pharmaceutical  Research  and  Development  since  1996 and our Chief Scientific
Officer  since  1998.  Dr.  Stirling served as Senior Vice President--Biological
and  Pharmaceutical  Research  and  Development  from  1993  to  1996,  as  Vice
President  -- New Technology Chiral Products from 1991 to 1993, and in a variety
of  other  research  positions  from  1986 to 1991. Previously, Dr. Stirling was
employed  by  Celanese  Research Company, a major chemical company, from 1980 to
1986.  Dr.  Stirling  received  a  Ph.D.  in biochemistry from the University of
Warwick.

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<PAGE>

JEROME  B. ZELDIS, M.D., PH.D. has been our Chief Medical Officer since 1999 and
our  Vice  President  --  Medical  Affairs  since February 1997. Since 1996, Dr.
Zeldis  has  also been Associate Attending Physician at New York Hospital. Since
1995,  Dr.  Zeldis  has  also  been  a Clinical Associate Professor of Medicine,
Cornell  University  Medical  School. From 1990 to 1994, Dr. Zeldis was Clinical
Research  Physician,  Sacramento  Medical Foundation, Center for Blood Research,
and  Associate  Professor  of Medicine at the University of California at Davis.
From  1988  to  1990,  Dr.  Zeldis  was  Assistant  Professor of Medicine at the
University  of  California at Davis. From 1986 to 1988, Dr. Zeldis was Assistant
Professor  of  Medicine,  Harvard  Medical  School. Dr. Zeldis was a director of
Sandoz  Research Foundation and Janssen Research Foundation. Dr. Zeldis received
a  Ph.D.  in  molecular  biophysics  and  biochemistry from Yale University. Dr.
Zeldis also received an M.D. degree from Yale Medical School.

JOSEPH  J.  DAY,  JR.  has been our Senior Vice President, Planning and Business
Development   since   January  1998.  Mr.  Day  is  a  28-year  veteran  of  the
pharmaceutical   industry.   During   his  career,  Mr.  Day  has  held  various
international  and  domestic  management positions with Cephalon, Inc., American
Home   Products   Corporation,   Johnson   &  Johnson,  Merck  and  Company  and
Schering-Plough  Corporation.  Mr.  Day received a B.S. in pharmacy from Fordham
University and an M.B.A. from Rutgers University.

GEORGE  W.  J. MATCHAM, PH.D. has been our Senior Vice President -- Celgro since
1996.  Dr.  Matcham  joined  in  1988, and became Vice President of Chiral Amine
Technology  in 1991 and Vice President and General Manager of Chiral Products in
1993.  Previously,  Dr.  Matcham  was  a Senior Scientist and Project Leader for
Shell  Research  Ltd.,  UK,  the  physical and biological research subsidiary of
Royal  Dutch/Shell, from 1981 to 1988. Dr. Matcham received a Ph.D. in microbial
enzymology  from  the  University  of  Wales,  and  was  Director  of Studies in
chemistry,  and a fellow of Emmanuel College of the University of Cambridge from
1979 to 1980.

STEVEN  D.  THOMAS,  PH.D. has been our Vice President -- Regulatory Affairs and
Project   Management   since   August   1999  and  was  our  Vice  President  --
Pharmaceutical  Development  from 1996 to 1999. Dr. Thomas held various research
and  development positions with us from 1992 to 1996. Previously, Dr. Thomas was
a  Business Unit Manager for Enzymatix Ltd., a pharmaceutical and fine chemicals
company,  from 1987 to 1992. Dr. Thomas received a Ph.D. in molecular enzymology
from Southampton University.

BRUCE  A.  WILLIAMS  has  been  our  Vice President -- Marketing and Sales since
1996.  Previously, Mr. Williams was employed by Ortho Biotech Inc., a subsidiary
of  Johnson  &  Johnson,  where  he  held  various  positions from 1989 to 1996,
including  Executive Director -- Marketing. From 1984 to 1989, Mr. Williams held
several  positions at American Cyanamid Company. Mr. Williams received a B.A. in
biology from Syracuse University and an M.B.A. from Columbia University.

JACK  L.  BOWMAN, one of our directors since April 1998, served as Company Group
Chairman  of  Johnson & Johnson from 1987 to 1994. From 1983 to 1987, Mr. Bowman
served  as  Executive  Vice President of American Cyanamid. Mr. Bowman is also a
director  of  NeoRx  Corporation,  Cell  Therapeutics,  Inc., CytRx Corporation,
Cellegy Pharmaceuticals and Targeted Genetics.

FRANK  T.  CARY  has  been  Chairman  of the Executive Committee of our board of
directors  since  July  1990  and has been one of our directors since 1987. From
1973  to 1981, Mr. Cary was Chairman of the Board and Chief Executive Officer of
International  Business  Machines  Corporation.  Mr.  Cary also is a director of
Cygnus  Therapeutic  Systems  Inc.,  ICOS  Corporation,  Lincare  Inc.,  Lexmark
International Inc., Vion Pharmaceuticals Inc. and Teltrend, Inc.

ARTHUR  HULL  HAYES,  JR.,  M.D.,  one of our  directors  since  1995,  has been
President  and Chief  Operating  Officer  of  MediScience  Associates,  Inc.,  a
consulting   organization  that  works  with  pharmaceutical  firms,  biomedical
companies and foreign  governments,  since July 1991.  Dr. Hayes has also been a
partner in Issue Sphere,  a public  affairs firm that focuses on health  science
issues,  since November  1995, as well as a professor in medicine,  pharmacology
and family and  community  medicine at New York  Medical  College  and  clinical
professor of medicine and  pharmacology  at the  Pennsylvania  State  University
College  of  Medicine.  From 1986 to 1990,  Dr.  Hayes was  President  and Chief
Executive Officer of E.M.  Pharmaceuticals,  a unit of E. Merck AG and from 1981
to 1983 was Commissioner of the United States Food and Drug Administration.  Dr.
Hayes also is a director of Myriad Genetics, Inc., NaPro BioTherapeutics, Inc.
and Premier Research Worldwide.

GILLA  KAPLAN,  PH.D., one of our directors since April 1998, is an immunologist
in  the  Laboratory  of  Cellular  Physiology  and Immunology at The Rockefeller
University  in  New York where she was appointed Assistant Professor in 1985 and
Associate  Professor  in  1990.  Dr. Kaplan is a member of numerous professional
societies  and has been the organizer of several major symposia on tuberculosis.
Dr. Kaplan has served as an advisor to the Global Program for Vaccines and

                                       33

<PAGE>

Immunization of the World Health  Organization,  has participated in several NIH
peer review panels, and is on the Editorial Board of Microbial Drug Resistances,
and  Tubercle  and Lung  Disease.  Dr.  Kaplan  is the  author  of more than 100
scientific publications and has received international recognition for her work.
In 1995,  she gave the  Special  Honorary  Lecture at the  American  Society for
Microbiology  and in 1997 was  appointed  a Fellow of the  American  Academy  of
Microbiology.

RICHARD  C.E.  MORGAN,  one  of  our directors since 1987, has been the Managing
Member  of Amphion Partners LLC, formerly Wolfensohn Partners, L.P., since 1986.
From  January  1996  to  January  1998, Mr. Morgan was a partner of Jackson Hole
Management  Company,  Inc. Mr. Morgan also is Chairman of the board of directors
of  AXCESS,  Inc.,  Chairman  of  the  board of directors of Quidel Corp., and a
director of Indigo, N.V. and a director of Orbis International, Inc.

WALTER L. ROBB,  PH.D.,  one of our  directors  since  1992,  has been a private
consultant and President of Vantage  Management  Inc., a consulting and investor
services  company,  since January 1993.  Mr. Robb was Senior Vice  President for
Corporate Research and Development of General Electric Company,  and a member of
its Corporate  Executive  Council from 1986 to December  1992.  Mr. Robb also is
Chairman of the board of directors of Capital  District Sports and a director of
Cree Research Inc., Mechanical Technology, Inc. and Plug Power, Inc.

LEE  J.  SCHROEDER,  one  of our directors since 1995, has been President of Lee
Schroeder  &  Associates, Inc., pharmaceutical business consultants, since 1985.
Mr.  Schroeder  was President of Fox Meyer Lincoln from 1983 to 1985, and was an
Executive  Vice  President of Sandoz, Inc. from 1981 to 1983. Mr. Schroeder also
is   a  director  of  Bryan  LGH  Hospital,  MGI  Pharmaceutical,  Inc.,  Ascent
Pediatrics, Inc. and Interneuron Pharmaceuticals, Inc.

                                       34
<PAGE>

                              SELLING STOCKHOLDER

The table below sets forth the  beneficial  ownership  of our common stock as of
December 31, 1999 by the selling stockholder. Beneficial ownership of our common
stock is determined in accordance  with the rules of the Securities and Exchange
Commission  and generally  includes  voting or investment  power with respect to
securities  and  options  that  are  exercisable  within  60 days.  The  selling
stockholder  has sole voting and investment  power with respect to all shares of
common stock shown as  beneficially  owned by it. All of the shares owned by the
selling stockholder are shares underlying our convertible notes held by it.

<TABLE>
<CAPTION>
                                                    ==========================================================
                                                     SHARES OWNED       NUMBER OF SHARES    SHARES OWNED
                                                    PRIOR TO OFFERING     BEING OFFERED    AFTER OFFERING
                                                    ------------------  ----------------  ----------------
NAME AND ADDRESS OF BENEFICIAL OWNER                NUMBER    PERCENT                     NUMBER   PERCENT
- --------------------------------------              ------   ---------  ----------------  -------  -------
<S>                                                 <C>      <C>        <C>               <C>     <C>

HANCOCK MEZZANINE PARTNERS, LP ....................  416,700   2.3%     208,000           208,700  1.0%
  c/o John Hancock Mutual Life Insurance Company
  200 Clarendon Street
  Boston, MA 02117
  Attention: Sandeep Alva
      Bond & Corporate Finance Group, T-57

SIGNATURE 1A (CAYMAN), LTD. .......................   27,780    *        13,867            13,913   *
  c/o John Hancock Mutual Life Insurance Company
  200 Clarendon Street
  Boston, MA 02117
  Attention: George H. Braun
      Bond & Corporate Finance Group, T-57

JOHN HANCOCK VARIABLE LIFE INSURANCE COMPANY ......   11,112    *         5,546             5,566   *
  c/o John Hancock Mutual Life Insurance Company
  200 Clarendon Street
  Boston, MA 02117
  Attention: Manager
       Investment Accounting Division, B-3

JOHN HANCOCK MUTUAL LIFE INSURANCE COMPANY ........  377,808   2.0%     188,587           189,221   *
  200 Clarendon Street
  Boston, MA 02117
  Attention: Manager
       Investment Accounting Division, B-3

</TABLE>

- ----------------
* Represents less than 1%.

                                       35

<PAGE>

                         DESCRIPTION OF CAPITAL STOCK

Our authorized  capital stock consists of 30,000,000 shares of common stock, par
value $.01 per share,  and 5,000,000  shares of preferred  stock, par value $.01
per  share,  of which 520  shares  have  been  designated  Series A  convertible
preferred  stock and 20,000 shares have been  designated as Series B convertible
preferred stock. As of December 31, 1999, there were 17,703,646 shares of common
stock outstanding, no shares of Series A convertible preferred stock outstanding
and no shares of Series B convertible preferred stock outstanding.

COMMON STOCK

Holders  of common  stock are  entitled  to one vote for each  share held on all
matters  submitted to a vote of stockholders,  and do not have cumulative voting
rights.  Holders of common stock are entitled to receive ratably such dividends,
if any,  as may be  declared  by our  board of  directors  out of funds  legally
available therefor,  and subject to any preferential dividend rights of any then
outstanding preferred stock. Upon liquidation, dissolution, or winding up of us,
the  holders of common  stock are  entitled  to receive  ratably  our net assets
available  after the payment of all debts and other  liabilities  and subject to
any liquidation  preference of any then outstanding  preferred stock. Holders of
common stock have no preemptive, subscription or conversion rights. There are no
redemption  or sinking  fund  provisions  applicable  to the common  stock.  The
outstanding  shares of common  stock are,  and the shares  offered by us in this
offering will be when issued and paid for, fully paid and non-assessable.

PREFERRED STOCK

Our board of  directors  has the  authority,  subject to  certain  restrictions,
without  further  stockholder  approval,  to issue, at any time and from time to
time,  shares of preferred  stock in one or more series.  Each such series shall
have  such  number  of  shares,   designations,   preferences,   voting  powers,
qualifications,  and  special  or  relative  rights  or  privileges  as shall be
determined by our board of directors,  which may include, among others, dividend
rights,  voting  rights,  redemption  and sinking fund  provisions,  liquidation
preferences,  conversion rights and preemptive rights, to the full extent now or
hereafter permitted by the laws of the State of Delaware.

The  rights of the  holders  of common  stock  will be  subject  to,  and may be
adversely  affected by, the rights of holders of any preferred stock that may be
issued in the future. Such rights may include voting and conversion rights which
could  adversely  affect the holders of the common  stock.  Satisfaction  of any
dividend  preferences of outstanding  preferred stock would reduce the amount of
funds available,  if any, for the payment of dividends on common stock.  Holders
of preferred stock would typically be entitled to receive a preference payment.

SHAREHOLDER RIGHTS PLAN

Our board of directors has adopted a shareholder  rights plan.  The  shareholder
rights plan was adopted to give the Board  increased  power to  negotiate in our
best interests and to discourage  appropriation of control of us at a price that
is unfair to our  stockholders.  It is not  intended to prevent  fair offers for
acquisition  of control  determined  by our board of directors to be in the best
interests of us and our stockholders,  nor is it intended to prevent a person or
group from  obtaining  representation  on or  control of our board of  directors
through a proxy  contest,  or to relieve our board of directors of its fiduciary
duty to consider any proposal for our acquisition in good faith.

The  shareholder  rights  plan  involved  the  distribution  of one "right" as a
dividend on each outstanding  share of our common stock to all holders of record
on September 26, 1996. Each right shall entitle the holder to purchase one-tenth
of a share of common  stock.  The rights  trade in tandem with the common  stock
until, and become exercisable upon, the occurrence of certain triggering events,
and the exercise price is based on the estimated  long-term  value of our common
stock.  The exercise of these rights becomes  economically  attractive  upon the
triggering of certain "flip-in" or "flip-over"  rights which work in conjunction
with the  shareholder  rights plan's basic  provisions.  The flip-in rights will
permit their  holders to purchase  shares of common stock at a discounted  rate,
resulting in substantial dilution of an acquiror's voting and economic interests
in us. The  flip-over  element of the  shareholder  rights  plan  involves  some
mergers or significant asset purchases, which trigger certain rights to purchase
shares of the  acquiring or  surviving  company at a discount.  The  shareholder
rights  plan  contains  a  "permitted   offer"  exception  which  allows  offers
determined  by our  board  of  directors  to be in our  best  interests  and our
stockholders  to take place  free of the  diluting  effects  of the  shareholder
rights plan's mechanisms.

                                       36

<PAGE>

Our board of directors  retains the right,  at all times prior to acquisition of
15% of our voting common stock by an acquiror,  to discontinue  the  shareholder
rights plan through the  redemption of all rights,  or to amend the  shareholder
rights plan in any respect.

DELAWARE LAW AND SOME BY-LAW PROVISIONS

Our board of directors has adopted certain amendments to our by-laws intended to
strengthen  our board of directors  position in the event of a hostile  takeover
attempt. These by-law provisions have the following effects:

o    they  provide that only persons who are  nominated in  accordance  with the
     procedures  set forth in the by-laws  shall be eligible for election as our
     directors, except as may be otherwise provided in the by-laws;

o    they provide that only business  brought  before the annual  meeting by our
     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    they  provide  that  only the  Chairman  of the  Board,  if any,  the Chief
     Executive Officer, the President, the Secretary  or a majority of our board
     of directors may call special meetings of our stockholders;

o    they  establish a procedure  for our board of  directors  to fix the record
     date whenever stockholder action by written consent is undertaken; and

o    they require a vote of holders of two-thirds of the  outstanding  shares of
     common stock to amend certain by-law provisions.

Furthermore,  we are 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.

TRANSFER AGENT AND REGISTRAR

The transfer agent and registrar for the common stock is American Stock Transfer
& Trust Company.  It is located at 40 Wall St., 46th Floor, New York, NY, 10005,
and its telephone number is (718) 921-8200.

                                       37

<PAGE>

                        SHARES ELIGIBLE FOR FUTURE SALE

Future sales of substantial  amounts of our common stock could adversely  affect
the prevailing market price of our common stock. In addition, as of December 31,
1999, there were outstanding  stock options  exercisable for 2,292,627 shares of
common stock, of which  approximately  967,234 were currently  exercisable,  and
outstanding  warrants  exercisable for 552,444 shares of common stock. If all of
the  convertible  notes  outstanding  on December 31, 1999 had been converted on
that  date,  approximately  2,418,305  shares of common  stock  would  have been
issued. Immediately prior to this offering, the selling stockholder will convert
a portion of our 9.0%  convertible notes issued in January  1999 held by it into
416,000  shares of our common stock.  All shares of common stock  referred to in
this paragraph  would be freely  tradeable upon issuance.  See  "Description  of
Capital Stock."

Shares  which may be acquired by a person  deemed an  affiliate  of ours as that
term is defined in Rule 144  promulgated  under the  Securities Act of 1933 will
remain  subject  to the  resale  limitations  of Rule 144.  Generally,  Rule 144
provides that a person who has  beneficially  owned  "restricted"  shares for at
least  one  year  will be  entitled  to  sell on the  open  market  in  brokers'
transactions  within  any three  month  period a number of shares  that does not
exceed the greater of:

o    1% of the then outstanding shares of common stock; and

o    the average  weekly  trading  volume in the common stock on the open market
     during the four calendar weeks preceding such sale.

Sales under Rule 144 are also subject to certain  post-sale notice  requirements
and the availability of current public information about us.

In the event that any person who is deemed to be our affiliate  purchases shares
of our common stock  pursuant to this offering or acquires  shares of our common
stock  pursuant to one of our employee  benefit  plans,  the shares held by such
person are required under Rule 144 to be sold in brokers' transactions,  subject
to the volume limitations described above. Shares properly sold in reliance upon
Rule 144 to persons who are not our affiliates are  thereafter  freely  tradable
without restriction.

We and our executive  officers and directors  and the selling  stockholder  have
agreed, with limited exceptions, that, during the period beginning from the date
of this  prospectus  and  continuing to and including the date 90 days after the
date of this prospectus,  none of us will, directly or indirectly,  offer, sell,
offer to sell,  contract  to sell or  otherwise  dispose of any shares of common
stock or any of our  securities  which are  substantially  similar to the common
stock,  including but not limited to any securities that are convertible into or
exchangeable  for, or that  represent the right to receive,  common stock or any
such substantially  similar  securities or enter into any swap, option,  future,
forward or other  agreement  that  transfers,  in whole or in part, the economic
consequence of ownership of common stock or any securities substantially similar
to the common  stock,  other than  pursuant to the exercise of stock options and
warrants  outstanding  on the date of this  prospectus,  the  conversion  of our
convertible  notes outstanding on the date of this prospectus and employee stock
option plans existing on the date of this prospectus,  without the prior written
consent of J.P. Morgan Securities Inc.

                                       38

<PAGE>

                                 UNDERWRITING

J.P. Morgan Securities Inc. and Prudential Securities Incorporated are acting as
joint lead managers.  J.P. Morgan Securities Inc. is acting as book running lead
manager for this offering.

The underwriters  named below, for whom J.P. Morgan Securities Inc.,  Prudential
Securities  Incorporated  and U.S.  Bancorp  Piper  Jaffray  Inc.  are acting as
representatives,  have severally agreed, subject to the terms and conditions set
forth in the underwriting  agreement between us, the selling stockholder and the
underwriters,  to purchase from us and the selling  stockholder,  and we and the
selling  stockholder  have agreed to sell to the  underwriters,  the  respective
numbers of shares of common stock set forth opposite their names below:

<TABLE>
<CAPTION>

                                                ----------
                                                 NUMBER OF
                                                    SHARES
UNDERWRITERS                                    ----------
<S>                                             <C>
J.P. Morgan Securities Inc. .................
Prudential Securities Incorporated ..........
U.S. Bancorp Piper Jaffray Inc. .............
    Total ...................................   ----------

                                                ==========

</TABLE>

The nature of the underwriters'  obligations under the underwriting agreement is
such that all of the common stock being offered, excluding shares covered by the
over-allotment option granted to the underwriters,  must be purchased if any are
purchased.

The  representatives  of the  underwriters  have  advised  us that  the  several
underwriters  propose to offer the common  stock to the public  initially at the
public  offering  price set forth on the cover page of this  prospectus  and may
offer the common stock to selected  dealers at such price less a concession  not
to exceed $_____ per share.  The  underwriters  may allow,  and such dealers may
reallow, a concession to other dealers not to exceed $_____ per share. After the
initial public offering of the common stock, the public offering price and other
selling terms may be changed by the representatives.

We have granted the  underwriters  an option,  exercisable  for 30 days from the
date of this prospectus,  to purchase up to additional shares of common stock at
the same  price per share to be paid by the  underwriters  for the other  shares
offered hereby. If the underwriters purchase any such additional shares pursuant
to the option,  each of the  underwriters  will be  committed  to purchase  such
additional shares in approximately the same proportion as set forth in the above
table. The  underwriters may exercise the option only to cover  over-allotments,
if any, made in  connection  with the  distribution  of the common stock offered
hereby.

The following tables show the per share and total  underwriting  discounts to be
paid to the  underwriters  by us and the selling  stockholder,  assuming both no
exercise and full exercise of the underwriters' over-allotment option.

<TABLE>
<CAPTION>

                       -----------------------------
                            PAYABLE BY CELGENE
                      ------------------------------
                        NO EXERCISE    FULL EXERCISE
                      -------------   --------------
<S>                   <C>             <C>
Per share .........       $                $
  Total ...........       $                $

</TABLE>

<TABLE>
<CAPTION>

                      ------------------------------
                              PAYABLE BY THE
                           SELLING STOCKHOLDER
                      ------------------------------
                        NO EXERCISE    FULL EXERCISE
                      -------------   --------------
<S>                   <C>             <C>
Per share .........       $                $
  Total ...........       $                $

</TABLE>

We and the selling stockholder have agreed to indemnify the underwriters against
certain  liabilities,  including  liabilities  under the  Securities  Act, or to
contribute  to  payments  the  underwriters  may be  required to make in respect
thereof.

We  estimate  that  the  total  expenses  of  this  offering  to  us,  excluding
underwriting discounts, will be $_____.

                                       39

<PAGE>

In connection with this offering,  the  underwriters  may engage in transactions
that  stabilize,  maintain  or  otherwise  affect  the  price of  common  stock.
Specifically, the underwriters may overallot this offering, creating a syndicate
short position. In addition, the underwriters may bid for, and purchase,  shares
of common stock in the open market to cover syndicate shorts or to stabilize the
price of the common  stock.  Finally,  the  underwriting  syndicate  may reclaim
selling  concessions  allowed for  distributing  shares of common  stock in this
offering,  if the syndicate repurchases  previously  distributed common stock in
syndicate covering transactions, in stabilization transactions or otherwise. Any
of these  activities may stabilize or maintain the market price of the shares of
common stock above independent  market levels. The underwriters are not required
to engage in these activities, and may end any of these activities at any time.

Prior to the pricing of the common stock, and until such time when a stabilizing
bid may have been made, some or all of the underwriters who are market makers in
the  common  stock may make  bids for or  purchases  of  shares of common  stock
subject to certain restrictions, known as passive market making activities.

We and our executive  officers and directors  and the selling  stockholder  have
agreed, with limited exceptions, that, during the period beginning from the date
of this  prospectus  and  continuing to and including the date 90 days after the
date of this prospectus,  none of us will, directly or indirectly,  offer, sell,
offer to sell,  contract  to sell or  otherwise  dispose of any shares of common
stock or any of our  securities  which are  substantially  similar to the common
stock,  including but not limited to any securities that are convertible into or
exchangeable  for, or that  represent the right to receive,  common stock or any
such substantially  similar  securities or enter into any swap, option,  future,
forward or other  agreement  that  transfers,  in whole or in part, the economic
consequence of ownership of common stock or any securities substantially similar
to the common  stock,  other than  pursuant to the exercise of stock options and
warrants  outstanding  on the date of this  prospectus,  the  conversion  of our
convertible  notes outstanding on the date of this prospectus and employee stock
option plans existing on the date of this prospectus,  without the prior written
consent of J.P. Morgan Securities Inc.

The  common  stock  is  traded  on  the  Nasdaq National Market under the symbol
"CELG."

It is expected that delivery of the shares will be made to investors on or about
__________, 2000.

From time to time in the ordinary course of their respective businesses, certain
of the  underwriters  and their  affiliates  have engaged in and may continue to
engage in commercial banking and/or investment banking  transactions with us and
our affiliates.

                                 LEGAL MATTERS

Proskauer  Rose LLP,  New York,  New York,  has  passed on the  validity  of the
shares.  Certain legal matters in connection with this offering are being passed
upon for the underwriters by Cahill Gordon & Reindel, New York, New York.

                                    EXPERTS

Our consolidated  financial statements as of December 31, 1998 and 1997, and for
each of the years in the three-year  period ended  December 31, 1998,  have been
included herein and in the Registration Statement in reliance upon the report of
KPMG LLP, independent certified public accountants,  appearing elsewhere herein,
and upon the authority of said firm as experts in accounting and auditing.

The statements in this prospectus  under the captions "Risk  Factors--We may not
be able  to  protect  our  intellectual  property"  and  "Business--Patents  and
Proprietary  Technology"  have been  reviewed and approved by Mathews,  Collins,
Shepherd & Gould,  P.A. and are included herein in reliance upon such review and
approval.

The statements in this  prospectus  that relate to U.S.  patent rights  licensed
from The  Rockefeller  University and  EntreMed/Children's  Medical Center Corp.
under the captions "Risk Factors--We may not be able to protect our intellectual
property" and "Business--Patents and Proprietary  Technology" have been reviewed
and  approved  by Pennie & Edmonds  LLP as  special  patent  counsel  to Celgene
Corporation  for these matters,  and are included  herein in reliance upon their
review and approval as experts in U.S. patent law.

The  statements  in  this  prospectus  under  the  captions  "Risk  Factors--The
pharmaceutical  and  agrochemical  industry is subject to  extensive  government
regulation   and   there  is  no   assurance   of   regulatory   approval"   and
"Business--Governmental   Regulation"   have  been   reviewed  and  approved  by
Kleinfeld,  Kaplan & Becker, as experts in such matters, and are included herein
in reliance upon such review and approval.

                                       40
<PAGE>

                      WHERE YOU CAN FIND MORE INFORMATION

We file reports with the Securities  and Exchange  Commission on a regular basis
that contain financial  information about us and our results of operations.  You
may read or copy any  document  that we file with the  Securities  and  Exchange
Commission at the Securities and Exchange  Commission'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  Securities  and  Exchange  Commission  for more
information at  1-800-SEC-0330.  Our Securities and Exchange  Commission filings
are also  available  at the  Securities  and Exchange  Commission's  web site at
http://www.sec.gov.

The Securities and Exchange  Commission  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 Securities and Exchange  Commission will
automatically  update and supersede this  information.  We are  incorporating by
reference  the documents  listed below and any future  filings that we will make
with the Securities and Exchange  Commission under Sections 13(a),  13(c), 14 or
15(d) of the Securities Exchange Act of 1934:

o    Our Annual Report on Form 10-K 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;

o    Our  Quarterly  Report on Form 10-Q for the fiscal  quarter ended March 31,
     1999;

o    Our  Quarterly  Report on Form 10-Q for the fiscal  quarter  ended June 30,
     1999; and

o    Our Quarterly  Report on Form 10-Q for the fiscal  quarter ended  September
     30, 1999.

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 Securities
and  Exchange   Commission.   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.

                                       41

<PAGE>

                              CELGENE CORPORATION

                  INDEX TO CONSOLIDATED FINANCIAL STATEMENTS

<TABLE>
<CAPTION>

                                                                                            PAGE

<S>                                                                                        <C>
AUDITED CONSOLIDATED FINANCIAL STATEMENTS
Independent Auditors' Report ............................................................. F-2
Consolidated Balance Sheets as of December 31, 1997 and 1998 ............................. F-3
Consolidated Statements of Operations -- Years Ended
 December 31, 1996, 1997, and 1998 ....................................................... F-4
Consolidated Statements of Stockholders' Equity (Deficit) -- Years Ended December 31,
  1996, 1997 and 1998..................................................................... F-5
Consolidated Statements of Cash Flows -- Years Ended December 31, 1996, 1997 and 1998 .... F-8
Notes to Consolidated Financial Statements ............................................... F-10


UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
Condensed Consolidated Balance Sheet as of September 30, 1999 (unaudited) ................ F-21
Condensed Consolidated Statements of Operations -- Nine Months Ended
  September 30,1999 and 1998 (unaudited) ................................................. F-22
Condensed Consolidated Statements of Operations -- Three Months Ended
  September 30, 1999 and 1998 (unaudited) ................................................ F-23
Consolidated Statements of Cash Flows -- Nine Months Ended
  September 30, 1999 and 1998 (unaudited)..................................................F-24
Notes to Unaudited Condensed Consolidated Financial Statements ........................... F-25

</TABLE>

                                      F-1

<PAGE>

                         INDEPENDENT AUDITORS' REPORT

The Board of Directors and Stockholders
CELGENE CORPORATION:

We  have  audited  the  accompanying  consolidated  balance  sheets  of  Celgene
Corporation  and  subsidiary  as of December 31, 1997 and 1998,  and the related
consolidated statements of operations,  stockholders' equity (deficit), and cash
flows for each of the years in the  three-year  period ended  December 31, 1998.
These consolidated  financial statements are the responsibility of the Company's
management.  Our  responsibility is to express an opinion on these  consolidated
financial statements based on our audits.

We  conducted  our  audits  in  accordance  with  generally   accepted  auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable  assurance about whether the  consolidated  financial  statements are
free of material  misstatement.  An audit includes  examining,  on a test basis,
evidence  supporting the amounts and disclosures in the  consolidated  financial
statements.  An audit also includes assessing the accounting principles used and
significant  estimates  made by  management,  as well as evaluating  the overall
consolidated  financial  statement  presentation.  We  believe  that our  audits
provide a reasonable basis for our opinion.

In our opinion, the consolidated  financial statements referred to above present
fairly, in all material respects,  the financial position of Celgene Corporation
and  subsidiary  as of  December  31,  1997 and 1998,  and the  results of their
operations and their cash flows for each of the years in the  three-year  period
ended  December  31,  1998 in  conformity  with  generally  accepted  accounting
principles.

                                           /s/ KPMG LLP

Short Hills, New Jersey
February 11, 1999

                                      F-2

<PAGE>

                              CELGENE CORPORATION
                          CONSOLIDATED BALANCE SHEETS

<TABLE>
<CAPTION>

                                                                                       ------------------------------------
                                                                                                   DECEMBER 31,
                                                                                       -------------------------------------
                                                                                                    1997                1998
                                                                                       -----------------   -----------------
<S>                                                                                    <C>                 <C>

ASSETS
Current assets:
 Cash and cash equivalents .........................................................    $   13,583,445      $    3,066,953
 Marketable securities available for sale ..........................................                --           2,056,890
 Accounts receivable, net of allowance of $43,386 in 1998...........................         1,430,384           2,662,389
 Inventory .........................................................................                --           1,571,408
 Other current assets ..............................................................           353,266             229,060
 Assets held for disposal ..........................................................           485,170                  --
                                                                                        --------------      --------------
   Total current assets ............................................................        15,852,265           9,586,700
Plant and equipment, net ...........................................................         2,286,024           2,262,130
Other assets .......................................................................            79,167              79,167
                                                                                        --------------      --------------
   Total assets ....................................................................    $   18,217,456      $   11,927,997
                                                                                        ==============      ==============
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
 Accounts payable ..................................................................    $      842,262      $    3,848,853
 Accrued expenses ..................................................................         1,388,933           3,041,859
 Capitalized lease obligations .....................................................           210,499             225,372
                                                                                        --------------      --------------
   Total current liabilities .......................................................         2,441,694           7,116,084
Capitalized lease obligation--net of current portion ...............................           350,670             195,578
Long term convertible note .........................................................                --           8,348,959
                                                                                        --------------      --------------
   Total liabilities ...............................................................         2,792,364          15,660,621
                                                                                        --------------      --------------
Stockholders' equity (deficit):
 Preferred stock, $.01 par value per share
   5,000,000 shares  authorized;  Series A convertible,  redeemable,  cumulative
   preferred; 74 shares issued and outstanding at December 31, 1997, plus
   $329,455 accretion premium; none outstanding at December 31, 1998................         4,029,455                  --
 Common stock, $.01 par value per share
   20,000,000  shares  authorized  at December  31, 1997 and  30,000,000  shares
   authorized at December 31, 1998; issued and outstanding 15,427,949 and
   16,612,973 shares at December 31, 1997 and December 31, 1998, respectively.......           154,279             166,130
 Common stock in treasury, at cost - 22,888 shares at December 31, 1997 and none
   at December 31, 1998 ............................................................           (76,535)                 --
 Additional paid-in capital ........................................................       130,838,433         140,714,314
 Accumulated deficit ...............................................................      (119,520,540)       (144,613,068)
                                                                                        --------------      --------------
   Total stockholders' equity (deficit) ............................................        15,425,092          (3,732,624)
                                                                                        --------------      --------------
 Total liabilities and stockholders' equity (deficit) ..............................    $   18,217,456      $   11,927,997
                                                                                        ==============      ==============

</TABLE>

See accompanying notes to consolidated financial statements.

                                      F-3

<PAGE>

                              CELGENE CORPORATION
                     CONSOLIDATED STATEMENTS OF OPERATIONS

<TABLE>
<CAPTION>

                                                                            --------------------------------------------------
                                                                                       FOR YEARS ENDED DECEMBER 31,
                                                                            --------------------------------------------------
                                                                                        1996             1997             1998
                                                                            ---------------- ---------------- ----------------
<S>                                                                         <C>              <C>              <C>
Revenues:

 Product sales ............................................................  $      65,000    $          --    $   3,265,490
 Research contracts .......................................................        816,665        1,122,193          535,000
                                                                             -------------    -------------    -------------
   Total revenues .........................................................        881,665        1,122,193        3,800,490
Expenses:
 Cost of goods sold .......................................................             --               --          282,307
 Research and development .................................................     15,152,735       17,380,390       19,771,953
 Selling, general and administrative ......................................      3,770,781        9,145,456       16,218,486
                                                                             -------------    -------------    -------------
   Total expenses .........................................................     18,923,516       26,525,846       36,272,746
                                                                             -------------    -------------    -------------
Operating loss ............................................................    (18,041,851)     (25,403,653)     (32,472,256)
Other income and expense:
 Interest income ..........................................................      1,308,243          495,580          705,215
 Interest expense .........................................................        323,913          111,771          255,832
                                                                             -------------    -------------    -------------
Loss from continuing operations ...........................................    (17,057,521)     (25,019,844)     (32,022,873)
Discontinued operations (note 10):
 Loss from operations .....................................................       (761,461)        (427,183)         (59,837)
 Gain on sale of chiral assets ............................................             --               --        7,014,830
                                                                             -------------    -------------    -------------
Net loss ..................................................................    (17,818,982)     (25,447,027)     (25,067,880)
Accretion of premium payable on preferred stock and warrants (note 7).           1,012,881          521,397           24,648
Deemed dividend for preferred stock conversion discount (note 7) ..........      2,777,777          953,077               --
                                                                             -------------    -------------    -------------
Net loss applicable to common stockholders ................................  $ (21,609,640)   $ (26,921,501)   $ (25,092,528)
                                                                             =============    =============    =============
Per share basic and diluted (note 2):
 Loss from continuing operations ..........................................  $       (1.81)   $       (2.05)   $       (1.98)
 Discontinued operations:
   Loss from operations ...................................................          (0.08)           (0.03)           (0.00)
   Gain on sale of chiral assets ..........................................             --               --             0.43
                                                                             -------------    -------------    -------------
 Net loss applicable to common stockholders ...............................  $       (2.29)   $       (2.20)   $       (1.55)
                                                                             =============    =============    =============
Weighted average number of shares of common stock outstanding .............      9,450,000       12,215,000       16,160,000
                                                                             =============    =============    =============
</TABLE>

See accompanying notes to consolidated financial statements.

                                      F-4

<PAGE>

                              CELGENE CORPORATION
           CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT)
                  YEARS ENDED DECEMBER 31, 1996, 1997 AND 1998

<TABLE>
<CAPTION>

                                   --------------------------------------------------------------------------------
                                         COMMON STOCK             PREFERRED STOCK             TREASURY STOCK
                                   ------------------------- ------------------------- ----------------------------
                                         SHARES       AMOUNT   SHARES           AMOUNT       SHARES          AMOUNT
                                   ------------ ------------ -------- ---------------- ------------ ---------------
<S>                                <C>          <C>          <C>      <C>              <C>          <C>
BALANCES AT JANUARY 1, 1996 ......   8,807,863   $  88,079       --    $           --     (24,271)    $      (243)
Exercised stock options ..........      42,069         420
Repurchase of shares .............                                                         (5,714)        (99,996)
Amortization of deferred
 compensation ....................
Conversion of convertible
 debentures ......................     372,681       3,727
Issuance of preferred stock,
 net .............................                              503        25,150,000
Conversion of preferred stock        1,388,809      13,888     (236)      (12,141,309)
Preferred stock lock-up
 warrants ........................
Accretion of premium on
 preferred stock .................                                            874,725
Deemed dividend for preferred
 stock conversion discount .......
Comprehensive Income
 (Loss):
 Net loss ........................
 Net change in unrealized gain (loss)
  on investment securities ........
 Total comprehensive
 income (loss) ...................
BALANCES AT DECEMBER 31, 1996 ....  10,611,422   $ 106,114      267    $   13,883,416     (29,985)    $  (100,239)
</TABLE>
<TABLE>
<CAPTION>
                                   --------------------------------------------------------------------------------
                                                                                       ACCUMULATED
                                       ADDITIONAL    UNAMORTIZED                             OTHER
                                          PAID-IN       DEFERRED       ACCUMULATED   COMPREHENSIVE
                                          CAPITAL   COMPENSATION           DEFICIT   INCOME (LOSS)            TOTAL
                                   -------------- -------------- ----------------- --------------- ----------------
<S>                                <C>            <C>            <C>               <C>             <C>
BALANCES AT JANUARY 1, 1996 ......  $ 78,064,288    $  (7,085)     $ (70,989,400)     $ (13,138)    $    7,142,501
Exercised stock options ..........       337,521                                                           337,941
Repurchase of shares .............                                                                         (99,996)
Amortization of deferred
 compensation ....................                      5,952                                                5,952
Conversion of convertible
 debentures ......................     2,645,388                                                         2,649,115
Issuance of preferred stock,
 net .............................    (1,320,375)                                                       23,829,625
Conversion of preferred stock ....    12,127,421                                                                --
Preferred stock lock-up
 warrants ........................       138,156                        (138,156)                               --
Accretion of premium on
 preferred stock .................                                      (874,725)                               --
Deemed dividend for preferred
 stock conversion discount .......     2,777,777                      (2,777,777)                               --
Comprehensive Income
 (Loss):
 Net loss ........................                                   (17,818,981)                      (17,818,981)
 Net change in unrealized gain (loss)
  on investment securities .......                                                       18,852             18,852
                                                                                                    --------------
 Total comprehensive
 income (loss) ...................                                                                      17,800,129
                                                                                                    --------------
BALANCES AT DECEMBER 31, 1996 ....  $ 94,770,176    $  (1,133)     $ (92,599,039)     $   5,714     $   16,065,009
</TABLE>

See accompanying notes to consolidated financial statements.

                                      F-5

<PAGE>

                              CELGENE CORPORATION
           CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT)
           YEARS ENDED DECEMBER 31, 1996, 1997 AND 1998 (CONTINUED)

<TABLE>
<CAPTION>
                                      ----------------------------------------------------------------------------------
                                            COMMON STOCK             PREFERRED STOCK               TREASURY STOCK
                                      ------------------------ ---------------------------- ----------------------------
                                            SHARES      AMOUNT      SHARES           AMOUNT       SHARES          AMOUNT
                                      ------------ ----------- ----------- ---------------- ------------ ---------------
<S>                                   <C>          <C>         <C>         <C>              <C>          <C>
BALANCES AT DECEMBER 31, 1996 .......  10,611,422   $ 106,114        267    $   13,883,416     (29,985)    $  (100,239)
Exercised stock options .............       2,986          30
Shares issued in lieu of cash
 bonus ..............................       5,000          50
Amortization of deferred
 compensation .......................
Conversion of convertible
 debenture ..........................     441,248       4,412
Issuance of Series B Preferred
 Stock-net ..........................                              5,000         4,046,923
Conversion of preferred stock .......   2,166,193      21,662     (5,180)      (14,654,071)
Accretion of premium on
 preferred stock ....................                                              521,397
Redemption of preferred stock .......                                (13)         (721,287)
Deemed dividend on Series B
 Preferred Stock and fair value
 of warrants ........................                                              953,077
Comprehensive Income (Loss):
 Net loss ...........................
Net change in unrealized gain
 (loss) on investment securities
Total comprehensive income
 (loss) .............................
Treasury shares issued ..............                                                            7,097          23,704
Issuance of common stock, net .......   2,201,100      22,011
                                       ----------   ---------       ------      ----------      -------      ----------
BALANCES AT DECEMBER 31, 1997 .......  15,427,949   $ 154,279         74    $    4,029,455     (22,888)    $   (76,535)
</TABLE>
<TABLE>
<CAPTION>
                                      -------------------------------------------------------------------------------------
                                                                                            ACCUMULATED
                                           ADDITIONAL    UNAMORTIZED                              OTHER
                                              PAID-IN       DEFERRED        ACCUMULATED   COMPREHENSIVE
                                              CAPITAL   COMPENSATION            DEFICIT   INCOME (LOSS)           TOTAL
                                      --------------- -------------- ------------------ --------------- -------------------
<S>                                   <C>             <C>            <C>                <C>             <C>
BALANCES AT DECEMBER 31, 1996 .......  $  94,770,176    $  (1,333)     $  (92,599,039)     $  5,714      $  16,065,009
Exercised stock options .............         20,187                                                            20,217
Shares issued in lieu of cash
 bonus ..............................         55,575                                                            55,625
Amortization of deferred
 compensation .......................                       1,133                                                1,133
Conversion of convertible
 debenture ..........................      2,326,892                                                         2,331,304
Issuance of Series B Preferred
 Stock-net ..........................        793,825                                                         4,840,748
Conversion of preferred stock .......     14,632,409                                                                --
Accretion of premium on
 preferred stock ....................                                        (521,397)                              --
Redemption of preferred stock .......                                                                         (721,287)
Deemed dividend on Series B
 Preferred Stock and fair value
 of warrants ........................                                        (953,077)                              --
Comprehensive Income (Loss):
 Net loss ...........................                                     (25,447,027)                     (25,447,027)
Net change in unrealized gain
 (loss) on investment securities                                                             (5,714)            (5,714)
                                                                                                         -------------
Total comprehensive income
 (loss) .............................                                                                      (25,452,741)
                                                                                                         -------------
Treasury shares issued ..............         55,250                                                            78,954
Issuance of common stock, net .......     18,184,119                                                        18,206,130
                                       -------------      -------       -------------        --------    -------------
BALANCES AT DECEMBER 31, 1997 .......  $ 130,838,433    $      --      $ (119,520,540)     $     --      $  15,425,092
</TABLE>

See accompanying notes to consolidated financial statements.

                                      F-6

<PAGE>

                              CELGENE CORPORATION
           CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT)
           YEARS ENDED DECEMBER 31, 1996, 1997 AND 1998 (CONTINUED)

<TABLE>
<CAPTION>

                                   ----------------------------------------------------------------------------
                                         COMMON STOCK           PREFERRED STOCK            TREASURY STOCK
                                   ------------------------ ------------------------ --------------------------
                                         SHARES      AMOUNT   SHARES          AMOUNT       SHARES        AMOUNT
                                   ------------ ----------- -------- --------------- ------------ -------------
<S>                                <C>          <C>         <C>      <C>             <C>          <C>
BALANCES AT
 DECEMBER 31, 1997 ...............  15,427,949   $154,279       74    $   4,029,455     (22,888)    $ (76,535)
Exercised stock options ..........     283,120      2,831
Exercise of warrants .............     118,230      1,183
Costs related to secondary
 offering ........................
Conversion of preferred stock          575,669      5,757      (74)      (4,054,103)
Accretion of premium on
 preferred stock .................                                           24,648
Shares issued for employee
 benefit plans ...................       8,317         83                                22,888        76,535
Stock purchase ...................     199,688      1,997
Net loss and comprehensive
 loss ............................  ----------   --------      ---    -------------     -------     ---------
BALANCES AT
 DECEMBER 31, 1998 ...............  16,612,973   $166,130       --    $          --          --     $      --
                                    ==========   ========      ===    =============     =======     =========



<CAPTION>

                                   ----------------------------------------------------------------------------------
                                                                                         ACCUMULATED
                                        ADDITIONAL    UNAMORTIZED                              OTHER
                                           PAID-IN       DEFERRED        ACCUMULATED   COMPREHENSIVE
                                           CAPITAL   COMPENSATION            DEFICIT   INCOME (LOSS)            TOTAL
                                   --------------- -------------- ------------------ --------------- ----------------
<S>                                <C>             <C>            <C>                <C>             <C>
BALANCES AT
 DECEMBER 31, 1997 ...............  $130,838,433        $ --        $ (119,520,540)        $ --       $  15,425,092
Exercised stock options ..........     2,028,715                                                          2,031,546
Exercise of warrants .............       986,883                                                            988,066
Costs related to secondary
 offering ........................       (73,136)                                                           (73,136)
Conversion of preferred stock          4,048,346                                                                 --
Accretion of premium on
 preferred stock .................                                         (24,648)                              --
Shares issued for employee
 benefit plans ...................       387,070                                                            463,688
Stock purchase ...................     2,498,003                                                          2,500,000
Net loss and comprehensive
 loss ............................                                     (25,067,880)                     (25,067,880)
                                    ------------        ---         --------------         ---        -------------
BALANCES AT
 DECEMBER 31, 1998 ...............  $140,714,314        $ --        $ (144,613,068)        $ --       $  (3,732,624)
                                    ============        ====        ==============         ====       =============
</TABLE>

See accompanying notes to consolidated financial statements.

                                      F-7

<PAGE>

                              CELGENE CORPORATION
                     CONSOLIDATED STATEMENTS OF CASH FLOWS

<TABLE>
<CAPTION>

                                                                  ------------------------------------------------------------
                                                                                    YEARS ENDED DECEMBER 31,
                                                                  ------------------------------------------------------------
                                                                                1996                 1997                 1998
                                                                  ------------------   ------------------   ------------------
<S>                                                               <C>                  <C>                  <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
Loss from continuing operations ...............................   $ (17,057,521)       $ (25,019,844)       $ (32,022,873)
Adjustments  to reconcile  loss from  continuing  operations
 to net cash used in operating activities:
 Depreciation .................................................          362,590              380,364              812,555
 Provision for losses on accounts receivable ..................               --                   --               43,386
 Amortization of convertible debt costs .......................          234,540              126,577                   --
 Amortization of deferred compensation ........................            5,952                1,133                   --
 Interest on convertible debentures ...........................          323,914               68,736                   --
 Issuance of stock award ......................................               --               55,625                   --
 Shares issued for employee benefit plans .....................               --               78,954              463,688
Change in current assets & liabilities:
 Increase in Inventory ........................................               --                   --          (1,571,408)
 Increase (decrease) in accounts payable and accrued
   expenses ...................................................          216,226            (379,091)            4,659,517
 (Increase) decrease in accounts receivable ...................           18,646          (1,051,789)          (1,275,391)
 (Increase) decrease in other assets ..........................        (256,586)              150,304              124,206
                                                                  -------------         -------------        -------------
Net cash used in continuing operations ........................     (16,152,239)         (25,589,031)         (28,766,320)
Net cash used in discontinued operations ......................        (491,872)            (302,996)             (59,837)
                                                                  -------------        -------------        -------------
Net cash used in operating activities .........................     (16,644,111)         (25,892,027)         (28,826,157)
                                                                  -------------        -------------        -------------
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures ..........................................      (1,340,232)          (1,240,775)            (788,661)
Proceeds from sales and maturities of marketable securities
 available for sale ...........................................      137,051,037           47,470,593            8,559,604
Purchases of marketable securities available for sale .........    (142,548,468)         (30,584,284)         (10,616,494)
Proceeds from sale of chiral assets ...........................               --                   --            7,500,000
                                                                  --------------        -------------        -------------
Net cash provided by (used in) investing activities ...........      (6,837,663)           15,645,534            4,654,449
                                                                  -------------         -------------        -------------
CASH FLOWS FROM FINANCING ACTIVITIES:
Net proceeds from secondary offering ..........................               --           18,206,130                   --
Costs related to secondary offering ...........................               --                   --             (73,136)
Proceeds from sale of stock ...................................               --                   --            2,500,000
Proceeds from exercise of common stock options and
 warrants .....................................................          237,946               20,217            3,019,612
Redemption of Series A preferred stock ........................               --            (721,287)                   --
Net proceeds from issuance of preferred stock .................       23,829,624            4,840,748                   --
Capital lease buyout ..........................................               --                   --            (400,414)
Capital lease funding .........................................               --              561,169              260,195
Proceeds from convertible note, net ...........................               --                   --            8,348,959
                                                                  --------------        -------------        -------------
Net cash provided by financing activities .....................       24,067,570           22,906,977           13,655,216
                                                                  --------------        -------------        -------------
Net (decrease) increase in cash and cash equivalents ..........          585,796           12,660,484         (10,516,492)
Cash and cash equivalents at beginning of year ................          337,165              922,961           13,583,445
                                                                  --------------        -------------        -------------
Cash and cash equivalents at end of year ......................   $     922,961        $  13,583,445        $   3,066,953
                                                                  =============        =============        =============
</TABLE>

See accompanying notes to consolidated financial statements.

                                      F-8

<PAGE>

                              CELGENE CORPORATION
               CONSOLIDATED STATEMENTS OF CASH FLOWS (CONTINUED)

<TABLE>
<CAPTION>

                                                                         -------------------------------------------------
                                                                                     YEARS ENDED DECEMBER 31,
                                                                         -------------------------------------------------
                                                                                   1996              1997             1998
                                                                         --------------   ---------------   --------------
<S>                                                                      <C>              <C>               <C>
NON-CASH INVESTING ACTIVITY:
Charge in net unrealized gain (loss) on marketable securities
 available for sale ..................................................    $    18,852       $    (5,714)     $        --
                                                                          ===========       ===========      ===========
NON-CASH FINANCING ACTIVITIES:
Issuance of common stock upon the conversion of convertible
 debentures and accrued interest thereon, net ........................    $ 2,649,115       $ 2,331,304      $        --
                                                                          ===========       ===========      ===========
Accretion of premium payable on preferred stock and warrants .........    $ 1,012,881       $   521,397      $    24,648
                                                                          ===========       ===========      ===========
Deemed dividend for preferred stock conversion discount ..............    $ 2,777,777       $   953,077      $        --
                                                                          ===========       ===========      ===========
Issuance of common stock upon the conversion of convertible
 preferred stock and accrued accretion thereon, net ..................   $ 12,141,309       $ 14,654,071     $ 4,054,103
                                                                         ============       ============     ===========
Issuance of common stock upon exercise of options through the
 return of common stock previously outstanding .......................    $    99,996       $        --      $        --
                                                                         ============     =============      ===========
INTEREST PAID ........................................................    $        --       $    20,599      $    19,766
                                                                         ============     =============      ===========
</TABLE>

See accompanying notes to consolidated financial statements.

                                      F-9

<PAGE>

                              CELGENE CORPORATION
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                       DECEMBER 31, 1996, 1997 AND 1998

(1) NATURE OF BUSINESS AND LIQUIDITY

Celgene  Corporation and its subsidiary  Celgro  (collectively  "Celgene" or the
"Company") is a specialty  pharmaceutical company engaged in the development and
commercialization  of human  pharmaceuticals and agrochemicals,  and employs two
broad  technology  platforms:  (i)  small  molecule  immunotherapeutic  compound
development and (ii)  biocatalytic  chiral  chemistry.  The initial  therapeutic
focus  of  the  immunology   program  is  the   development  of  small  molecule
pharmaceuticals  that have the potential to selectively  regulate Tumor Necrosis
Factor alpha  ("TNF(alpha)"),  a protein whose overproduction has been linked to
many  chronic  inflammatory  and  immunological  diseases.  The  Company's  lead
compound in immunology is THALOMID(Reg.  TM), its formulation of thalidomide,  a
potent yet  selective  inhibitor of  TNF(alpha).  On July 16, 1998,  the Company
received an approval from the United States Food and Drug Administration ("FDA")
to market THALOMID for the treatment of erythema  nodosum leprosum  ("ENL"),  an
inflammatory  complication  of  leprosy,  and  commenced  sales  at  the  end of
September 1998. The Company expects to submit an additional New Drug Application
("NDA") in 2000 to market THALOMID in the treatment of multiple myeloma, a blood
related  cancer.  Celgene has further  applied its  expertise in small  molecule
chemistry to develop novel and proprietary thalidomide analogues, called IMiDsTM
("ImmunoModulatory Drugs"), as well as a class of proprietary  immunotherapeutic
pharmaceutical   compounds  called  SelCIDsTM  ("Selective  Cytokine  Inhibitory
Drugs").  These two classes of compounds are orally administered small molecules
that are highly  specific for the  suppression of TNF(alpha) and are intended to
treat chronic inflammatory diseases and other disorders.

The Company  expects  that its rate of spending  will  increase as the result of
increased  clinical  trial costs and  expenses  associated  with the  regulatory
approval  process and  commercialization  of  products  now in  development  and
increased commercial costs related to the launch of THALOMID. In order to assure
funding  for the  Company's  future  operations,  the  Company  may need to seek
additional  capital  resources.  However,  no  assurances  can be given that the
Company will be successful in raising additional  capital.  The Company believes
that its current financial resources including $15.0 million received in January
1999  for a  convertible  note  issued  to an  institutional  investor  plus the
revenues from the sales of THALOMID will fund operations through 1999.

The  consolidated  financial  statements  include  the  parent  Company  and its
subsidiary  Celgro.  All inter-company  transactions  have been eliminated.  The
preparation of the consolidated financial statements requires management to make
estimates and assumptions that affect reported  amounts and disclosures.  Actual
results  could  differ from those  estimates.  The Company is subject to certain
risks  and   uncertainties   such  as   uncertainty   of  product   development,
uncertainties  regarding regulatory approval,  no assurance of market acceptance
of  products,  risk  of  product  liability,   uncertain  scope  of  patent  and
proprietary rights, intense competition, and rapid technological change.

(2) SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

(a) Cash Equivalents

At December 31, 1997 and 1998, cash equivalents  consisted  principally of funds
invested in money market funds, and United States government  securities such as
treasury bills and notes.

(b) Marketable Securities

The  Company has  classified  all of its  marketable  securities  as  securities
available for sale at December 31, 1998.  Such securities were to be held for an
indefinite  period  of time and  were  intended  to be used to meet the  ongoing
liquidity  needs of the  Company.  Realized  gains and  losses are  included  in
operations and are measured using the specific cost identification method.

                                      F-10

<PAGE>

                              CELGENE CORPORATION
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                  DECEMBER 31, 1996, 1997 AND 1998 (CONTINUED)

(2) SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)

(c) Inventory

Inventories are priced at lower of cost or market using the first-in,  first-out
("FIFO") method.  The cost of inventory  reflects  primarily the packaging costs
for a  significant  portion  of  the  finished  goods  inventory.  Prior  to FDA
approval, the raw material,  formulation and encapsulation costs are recorded as
research and development expense.

(d) Long-Lived Assets

Plant and equipment are stated at cost.  Depreciation  of plant and equipment is
provided using the  straight-line  method.  The estimated  useful lives of fixed
assets are as follows:

<TABLE>

                    <S>                          <C>

                      Laboratory equipment and
                      machinery.................  5-10 years
                      Furniture and fixtures....  5-10 years

</TABLE>

Amortization  of leasehold  improvements is calculated  using the  straight-line
method  over  the  term of the  lease or the  life of the  asset,  whichever  is
shorter.  Maintenance  and repairs are charged to operations as incurred,  while
renewals and improvements are capitalized.

The Company reviews long-lived assets for impairment  whenever events or changes
in business  circumstances  occur that indicate that the carrying  amount of the
assets may not be  recoverable.  The  Company  assesses  the  recoverability  of
long-lived  assets  held and to be used  based on  undiscounted  cash  flows and
measures the impairment, if any, using discounted cash flows.

(e) Research and Development Costs

All research and development costs are expensed as incurred.

(f) Income Taxes

The Company  utilizes the asset and liability  method of  accounting  for income
taxes.  Under this method,  deferred tax assets and  liabilities  are determined
based on the difference between the financial statement carrying amounts and tax
bases of assets and liabilities  using enacted tax rates in effect for all years
in which the temporary differences are expected to reverse.

Research and  development  tax credits will be  recognized as a reduction of the
provision for income taxes when realized.

(g) Revenue Recognition

Revenue from the sale of products is recognized upon product  shipment.  Revenue
under research contracts is recorded as earned under the contracts, generally as
services are  provided.  Revenue is  recognized  immediately  for  nonrefundable
license fees when agreement terms require no additional  performance on the part
of the Company.

(h) Stock Options

The Company  generally  does not record  compensation  cost for the  issuance of
employee  stock options since the options are generally  issued with an exercise
price equal to the market price at the date of grant.  For the fair value of the
employee stock options issued in 1996, 1997 and 1998, see note 8.

                                      F-11

<PAGE>

                              CELGENE CORPORATION
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                  DECEMBER 31, 1996, 1997 AND 1998 (CONTINUED)

(2) SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)

(i) Earnings per Share

"Basic"  earnings per common share equals net income divided by weighted average
common shares outstanding during the period. "Diluted" earnings per common share
equals  net  income  divided  by  the  sum of  weighted  average  common  shares
outstanding  during the period plus common stock  equivalents  if dilutive.  The
Company's  basic and  diluted  per share  amounts are the same since the assumed
exercise of stock options,  warrants,  conversion of convertible  debentures and
preferred stock are all  anti-dilutive.  The amount of common stock  equivalents
excluded from the  calculation  were  3,738,168 in 1996,  3,770,954 in 1997, and
3,863,535 in 1998.

(j) Comprehensive Income

On January 1, 1998,  the  Company  adopted  Statement  of  Financial  Accounting
Standard  ("SFAS")  No.  130,  Reporting  Comprehensive  Income.  SFAS  No.  130
establishes standards for reporting and presentation of comprehensive income and
its  components  in a full set of  financial  statements.  Comprehensive  income
(loss)  consists of net losses and net  unrealized  gains (losses) on securities
and  is  presented  in  the  consolidated  statements  of  stockholders'  equity
(deficit).  The Statement requires only additional  disclosures in the financial
statements;  it does not affect the Company's  financial  position or results of
operations. Prior year financial statements have been reclassified to conform to
the requirements of SFAS No. 130.

(k) Presentation

In  connection  with  the  disposition  of  the  Company's  chiral  intermediate
operation (see note 10), the 1996, 1997, and 1998 financial  results  applicable
to continuing operations exclude amounts from this discontinued operation.

(l) Fair Value of Financial Instruments

The fair value, which is the carrying value, of marketable  securities available
for  sale  is  based  on  quoted  market  prices.  The  convertible   debentures
approximate fair value due to interest rates approximating market rates. For all
other financial  instruments their carrying value approximates fair value due to
the short maturity of these instruments.

(3) INVENTORY

<TABLE>
<CAPTION>

                          ---------------
                             DECEMBER 31,
                                     1998
                          ---------------
<S>                       <C>
Raw materials ...........    $  440,400
Work in process .........       535,494
Finished goods ..........       595,514
                             ----------
Total ...................    $1,571,408
                             ==========
</TABLE>

Inventory costs prior to FDA approval of THALOMID on July 16, 1998 were expensed
as research and development costs.

                                      F-12

<PAGE>

                              CELGENE CORPORATION
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                  DECEMBER 31, 1996, 1997 AND 1998 (CONTINUED)

(4) PLANT AND EQUIPMENT

Plant and equipment consists of the following:

<TABLE>
<CAPTION>

                                             -----------------------------
                                                     DECEMBER 31,
                                             -----------------------------
                                                       1997           1998
                                             -------------- --------------
<S>                                          <C>            <C>
Leasehold improvements .....................  $ 3,957,366    $ 4,008,246
Laboratory equipment and machinery .........    4,430,336      4,874,733
Furniture and fixtures .....................      437,478        470,667
Leased equipment ...........................      415,109        675,304
                                              -----------    -----------
                                                9,240,289     10,028,950
Less: accumulated depreciation .............    6,954,265      7,766,820
                                              -----------    -----------
                                              $ 2,286,024    $ 2,262,130
                                              ===========    ===========
</TABLE>

(5) ACCRUED EXPENSES

Accrued expenses consists of the following:

<TABLE>
<CAPTION>

                                           -----------------------------
                                                   DECEMBER 31,
                                           -----------------------------
                                                     1997           1998
                                           -------------- --------------
<S>                                        <C>            <C>
Professional and consulting fees .........  $   235,000    $   787,381
Accrued compensation .....................    1,041,772      1,650,048
Other ....................................      112,161        604,430
                                            -----------    -----------
                                            $ 1,388,933    $ 3,041,859
                                            ===========    ===========
</TABLE>

(6) CONVERTIBLE DEBT

On September 16, 1998, the Company issued a convertible note to an institutional
investor in the amount of $8,750,000. The note has a five year term and a coupon
rate of 9.25% with interest payable on a semi-annual  basis. The note contains a
conversion  feature  that allows the note holder to convert the note into shares
of common stock after one year at $11 per share. The Company can redeem the note
after three years at 103% of the principal  amount,  (two years if the Company's
stock trades at $24.75 or higher for a period of 20  consecutive  trading days).
This note was issued at a discount of  $437,500  which is being  amortized  over
three years.

During 1995, the Company  issued and sold in an offering  pursuant to Regulation
S, 8% convertible debentures due July 31, 1997 in the aggregate principal amount
of $12,000,000, and received net proceeds, after offering costs, of $11,022,570.
The recorded  value of the  debentures at the date of issuance was discounted to
produce a market interest rate of approximately  13.5%. As of December 31, 1997,
all  convertible  debentures in the aggregate  principal  amount of $12,000,000,
plus accrued  interest,  had been converted into a total of 1,709,845  shares of
common stock.

(7) STOCKHOLDERS' EQUITY

Series A Convertible Preferred Stock

On March 13, 1996, in a private placement, the company completed the sale of 503
shares of Series A Convertible  Preferred  Stock,  par value $.01 per share (the
"Preferred Stock"), at an issue price of $50,000 per share. The Company received
net proceeds,  after offering costs, of $23,829,625.  The Preferred Stock,  plus
accretion  at a rate of 4.9% per year,  was  convertible,  at the  option of the
holders  thereof,  into common  stock of the Company at a  conversion  price per
share of common stock equal,  generally, to the lesser of (i) $18.81 or (ii) 90%
of the average closing price per share of the common stock for the seven trading
days immediately prior to the date of conversion. As a result of the issuance of
securities with variable conversion  features,  the Company recognized the value
of the discount to market conversion feature as a deemed dividend.

                                      F-13

<PAGE>

                              CELGENE CORPORATION
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                  DECEMBER 31, 1996, 1997 AND 1998 (CONTINUED)

(7) STOCKHOLDERS' EQUITY (CONTINUED)

In connection  with the private  placement,  the Company also granted to certain
executives and affiliates of the placement agent warrants, valued at $60,168, to
purchase an aggregate of 66,853  shares of common stock at an exercise  price of
$20.52,  subject  to  proportional  adjustment  in the  event  that the  Company
undertakes a stock split,  stock  dividend,  recapitalization  or similar event.
These  warrants  are  exercisable  for a period of five  years  from the date of
issuance. These warrants are all outstanding at December 31, 1998.

As of December 31, 1998, all of the shares of the Series A Preferred  Stock (503
shares), with their respective accrued accretion, had been converted or redeemed
into 3,342,202 shares of common stock. Through December 31, 1998 the Company had
accrued $1,420,770 representing accretion of the premium on the Preferred Stock.
The Company agreed to reduce the maximum  conversion price of 58 shares to $8.50
per share of common stock from $18.81 for holders who agreed to a lock-up ending
on December 1, 1997. During 1996, the Company had also issued warrants valued at
$138,156,  that entitle certain  stockholders of the Series A Preferred Stock to
purchase  153,507  shares of common  stock at an  exercise  price of $11.50  per
share.  The warrants were issued in exchange for the deferral of conversion  for
90 days.  At  December  31,  1998,  all these  warrants  either  expired or were
exercised for 3,418 shares of common stock.

Series B Convertible Preferred Stock

On June 9, 1997, in a private placement, the Company completed the sale of 5,000
shares of Series B Convertible  Preferred Stock (the "Series B Preferred"),  par
value  $.01 per  share,  at an issue  price of $1,000  per  share.  The  Company
received net proceeds,  after offering  costs,  of  $4,840,748.  Shares could be
converted at an initial  conversion price of $6.50 per share. As of December 31,
1998,  all shares of the Series B  Preferred  had been  converted  into  788,469
shares of common stock.

Upon  request  of the  purchasers  of the  Series B  Preferred,  the  Company is
required to issue  warrants to acquire a number of shares of common  stock equal
to (i) 1,500,000  divided by the conversion price in effect on the issuance date
(230,769  warrants as of December  31,  1998) plus (ii) 37.5% of the  conversion
shares  issuable on such issuance date upon conversion of all shares of Series B
Preferred  Stock  issued  through  the  issuance  date  (288,461  warrants as of
December 31,  1998).  All such  warrants will have a term of four years from the
issuance  date and an exercise  price equal to 115% of the  conversion  price in
effect on the  issuance  date ($6.50 at December  31,  1998).  The fair value of
warrants at the issuance date was $1.28 per warrant. As of December 31, 1998, no
warrants had been issued.

Through  December  31,  1998,  the Company had  recorded  $953,077  representing
accretion  of the deemed  dividend on the Series B Preferred  Stock.  The deemed
dividend  represents  the  difference  between  the  Series  B  Preferred  Stock
conversion  price and the fair market value of the Company's common stock at the
date of issuance.

Preferred Stock

Moreover,  the 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.

Rights Plan

During 1996, the Company adopted a shareholder  rights plan ("Rights Plan"). The
Rights  Plan  involves  the  distribution  of one  "Right" as a dividend on each
outstanding  share of the  Company's  common  stock to each  holder of record on
September 26, 1996. Each Right shall entitle the holder to purchase one-tenth of
a share of common stock. The Rights trade in tandem with the common stock until,
and are exercisable upon,  certain  triggering events, and the exercise price is
based on the estimated long term value of the Company's common stock.

(8) STOCK BASED COMPENSATION

(a) Stock Options

The Company has two  incentive  plans that  provide for the granting of options,
restricted stock awards, stock appreciation rights, performance awards and other
stock-based awards to employees and officers of the Company to purchase not more
than an aggregate  of  1,400,000  shares of common stock under the 1992 plan and
1,500,000 shares of common stock under

                                      F-14

<PAGE>

                              CELGENE CORPORATION
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                  DECEMBER 31, 1996, 1997 AND 1998 (CONTINUED)

(8) STOCK BASED COMPENSATION (CONTINUED)

the 1998 plan, subject to adjustment under certain circumstances. The Management
Compensation   and  Development   Committee  of  the  Board  of  Directors  (the
"Committee")  determines the type, amount and terms,  including vesting,  of any
awards  made under the Incentive  Plans.  The plans  terminate in 2002 and 2008,
respectively.

With respect to options  granted under the incentive  plans,  the exercise price
may not be less than the fair  market  value of the common  stock on the date of
grant. In general, each option granted under the Plans vests evenly over a three
or four year  period and  expires  10 years  from the date of grant,  subject to
earlier expiration in case of termination of employment.  The vesting period for
options  and  restricted  stock  awards  granted  under the Plans is  subject to
certain acceleration provisions if a change in control, as defined in the Plans,
occurs.

On June 16, 1995, the stockholders of the Company approved the 1995 Non-Employee
Directors'  Incentive  Plan,  which  provides for the granting of  non-qualified
stock options to purchase an aggregate of not more than 350,000 shares of common
stock (subject to adjustment  under certain  circumstances)  to directors of the
Company  who  are  not  officers  or  employees  of the  Company  ("Non-Employee
Directors").  Each new Non-Employee  Director,  upon the date of his election or
appointment,  receives  an option to  purchase  20,000  shares of common  stock.
Additionally,  upon  the  date of each  annual  meeting  of  stockholders,  each
continuing Non-Employee Director receives an option to purchase 10,000 shares of
common  stock (or a pro rata  portion  thereof  if he has  served  less than one
year). The shares subject to each non-employee director's option grant of 20,000
shares  vest  in  four  equal  annual  installments   commencing  on  the  first
anniversary of the date of grant. The shares subject to an annual meeting option
grant vest in full on the date of the first annual meeting of stockholders  held
following the date of grant.  All options are granted at an exercise  price that
equals the fair market value of the Company's common stock at the grant date and
expire 10 years after the date of grant. This plan terminates in 2005.

The  weighted-average  fair value per share for stock options  granted was $3.97
for the 1998 options, $3.93 for the 1997 options, and $5.01 for those granted in
1996.  The Company  estimated  the fair values  using the  Black-Scholes  option
pricing model and used the following assumptions:

<TABLE>
<CAPTION>

                                               --------------------------------
                                                     1996       1997       1998
                                               ---------- ---------- ----------
<S>                                            <C>        <C>        <C>
Risk-free interest rate ......................     6.38%      6.37%      5.68%
Expected stock price volatility ..............       62%        55%        66%
Expected term until exercise (years) .........     2.22       3.09       2.86
Expected dividend yield ......................        0%         0%         0%
</TABLE>

The Company does not record  compensation  expense for stock option grants.  The
following table summarizes  results as if compensation  expense was recorded for
the annual option grants under the fair value method:

<TABLE>
<CAPTION>

                                                   -------------------------------------------
In thousands of dollars, except per share data             1996           1997           1998
- -------------------------------------------------- ------------- -------------- --------------
<S>                                                <C>           <C>            <C>
Net loss applicable to common stockholders:
 As reported .....................................   $ (21,610)    $  (26,922)    $  (25,093)
 Pro forma .......................................   $ (23,515)    $  (28,652)    $  (26,745)
Per share basic and diluted:
 As reported .....................................   $   (2.29)    $    (2.20)    $    (1.55)
 Pro forma .......................................   $   (2.49)    $    (2.35)    $    (1.66)

</TABLE>


The pro forma effects on net loss and loss per share for 1996, 1997 and 1998 may
not  be   representative  of  the  pro  forma  effects  in  future  years  since
compensation cost is allocated on a straight-line basis over the vesting periods
of the grants, which extends beyond the reported years.

                                      F-15

<PAGE>

                              CELGENE CORPORATION
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                  DECEMBER 31, 1996, 1997 AND 1998 (CONTINUED)

(8) STOCK BASED COMPENSATION (CONTINUED)

The following table summarizes the stock option activity for both Plans:

<TABLE>
<CAPTION>

                                   ---------------------------------------
                                                  OPTIONS OUTSTANDING
                                   -=-------------------------------------
                                                                  WEIGHTED
                                           SHARES                  AVERAGE
                                        AVAILABLE                PRICE PER
                                        FOR GRANT        SHARES      SHARE
                                    ------------- ------------- ----------
<S>                                 <C>           <C>           <C>
Balance January 1, 1996 ...........   1,201,913     1,415,341    $   7.70
 Expired ..........................    (126,126)           --          --
 Granted ..........................    (679,037)      679,037       13.25
 Exercised ........................          --       (42,069)       8.03
 Cancelled ........................      46,095       (46,095)       6.40
                                      ---------     ---------    --------
Balance December 31, 1996 .........     442,845     2,006,214        9.60
 Authorized .......................     500,000            --          --
 Expired ..........................     (74,797)           --          --
 Granted ..........................    (492,775)      492,775        9.39
 Exercised ........................          --        (6,986)       7.83
 Cancelled ........................     142,027      (142,027)       9.36
                                      ---------     ---------    --------
Balance December 31, 1997 .........     517,300     2,349,976        9.59
 Authorized .......................   1,620,000            --          --
 Expired ..........................     (85,095)           --          --
 Granted ..........................    (559,983)      559,983        8.87
 Exercised ........................          --      (283,120)       7.18
 Cancelled ........................     198,726      (198,726)      10.74
                                      ---------     ---------    --------
Balance December 31, 1998 .........   1,690,948     2,428,113    $   9.62
                                      =========     =========    ========
</TABLE>

                                      F-16

<PAGE>

                              CELGENE CORPORATION
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                  DECEMBER 31, 1996, 1997 AND 1998 (CONTINUED)

(8) STOCK BASED COMPENSATION (CONTINUED)

The following table summarizes  information concerning options outstanding under
the Plans at December 31, 1998:

<TABLE>
<CAPTION>

                            ------------------------------------------------------------------------
                               OPTIONS OUTSTANDING                           OPTIONS EXERCISABLE
                            --------------------------                   ---------------------------
                                              WEIGHTED        WEIGHTED                      WEIGHTED
                                   NUMBER      AVERAGE         AVERAGE          NUMBER       AVERAGE
                              OUTSTANDING     EXERCISE       REMAINING     EXERCISABLE      EXERCISE
RANGE OF EXERCISE PRICE       AT 12/31/98        PRICE     TERM (YRS.)     AT 12/31/98         PRICE
- -------------------------   -------------   ----------   -------------   -------------   -----------
<S>                         <C>             <C>          <C>             <C>             <C>
$ 5.00-9.00 .............     1,350,740      $  7.48           5.6           863,361      $   7.12
$ 9.01-13.00 ............       610,644        10.74           7.6           298,854         10.81
$13.01-18.00 ............       466,729        14.31           6.9           405,319         14.12
                              ---------      -------           ---         ---------      --------
                              2,428,113      $  9.62           6.6         1,567,534      $   9.63
                              =========      =======           ===         =========      ========
</TABLE>

On January  22,  1999 the  Company  granted  options to  purchase  approximately
105,000  shares to certain  members of management  exercisable at $16.50 (market
price at the date of grant). These options vest evenly over three years and have
a ten year term.  Also on January  22,  1999,  the  Company  granted  options to
purchase  approximately 140,000 shares to certain employees at an exercise price
of $16.50. The options vest equally over four years and have a ten year term.

(b) Stock Awards

On January 1, 1997, the Company  awarded 5,000 shares to the Company's  Chairman
and Chief Executive  Offer,  which were  immediately  vested.  The fair value of
$55,625 for this award was expensed.

(c) Warrants

In connection with the retention of an investment firm to assist in the sale and
issuance of 8% convertible  notes,  the Company in August,  1995 granted to such
firm warrants to purchase until July 31, 2000, 105,000 shares of common stock at
a price of $9.60 per share.  As of  December  31,  1998,  40,188  warrants  were
outstanding.

In connection with the retention of an investment firm to assist in the sale and
issuance of the Series A Preferred Stock, the Company, in March, 1996 granted to
such firm  warrants to purchase  until March 10, 2001,  66,853  shares of common
stock at a price of $20.52.  These warrants were  outstanding as of December 31,
1998.

During  1997,  the  Company  issued  to  certain  stockholders  of the  Series A
Convertible  Preferred Stock warrants valued at $7,826, to purchase 8,696 shares
of common  stock at an exercise  price of $11.50.  The  warrants  were issued in
exchange  for the  deferral  of  conversion  for 90  days.  These  warrants  are
exercisable  for a period  of two  years  from the date of  issuance  and  these
warrants were outstanding as of December 31, 1998.

In  connection  with  the  retention  of  a  consultant  to  provide   strategic
development services,  the Company, in December 1997, granted to such consultant
warrants to purchase until December 24, 1999,  5,000 shares of common stock at a
price of $12.00. These warrants were outstanding as of December 31, 1998.

                                      F-17

<PAGE>

                              CELGENE CORPORATION
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                 DECEMBER 31, 1996, 1997 AND 1998 (CONTINUED )

(9) INCOME TAXES

At December  31, 1997 and 1998,  the tax effects of temporary  differences  that
give rise to deferred tax assets are as follows:

<TABLE>
<CAPTION>

                                                                        -------------------------------
                                                                                   1997            1998
                                                                        --------------- ---------------
<S>                                                                     <C>             <C>
Deferred Assets:

   Federal and state net operating loss carryforwards .................  $  44,334,000   $  54,779,000
   Research and experimentation tax credit carryforwards ..............      2,735,000       3,235,000
   Plant and equipment, principally due to differences in depreciation         753,000         772,000
   Patents, principally due to differences in amortization ............         68,000          62,000
   Accrued expenses ...................................................        385,000         665,000
                                                                         -------------   -------------
   Total deferred tax assets ..........................................     48,275,000      59,513,000
   Valuation allowance ................................................    (48,275,000)    (59,513,000)
                                                                         -------------   -------------
   Net deferred tax assets ............................................  $          --   $          --
                                                                         =============   =============

</TABLE>

A  valuation  allowance  is  provided  when it is more likely than not that some
portion or all of the deferred tax assets will not be realized.  At December 31,
1998,  the  Company  had  net  operating  loss  carryforwards  of  approximately
$135,000,000  that will expire in the years 2001 through 2012.  The Company also
has  research  and   experimentation   credit   carryforwards  of  approximately
$3,235,000   that   expire   in  the   years   2001   through   2018.   Ultimate
utilization/availability  of  such  net  operating  losses  and  credits  may be
curtailed if a significant change in ownership occurs.

(10) DISCONTINUED OPERATION

On January 9, 1998, the Company concluded an agreement with Cambrex  Corporation
for Cambrex to acquire Celgene's chiral intermediate  business for approximately
$15  million.  The  Company  received  $7.5  million  upon  the  closing  of the
transaction,  and  will  receive  future  royalties  with a  present  value  not
exceeding  $7.5  million,  with certain  minimum  royalty  payments in the third
through  sixth year  following the closing of the  transaction.  Included in the
transaction are the rights to Celgene's enzymatic  technology for the production
of chirally pure  intermediates for the pharmaceutical  industry,  including the
current  pipeline  of third  party  products  and the  equipment  and  personnel
associated with the business.

Revenues relative to the chiral  intermediate  business were  approximately $1.4
million and $2.1  million  for  1996 and  1997,  respectively.  Direct  expenses
related to the chiral  intermediate  business were $2.2 million and $2.5 million
for 1996 and 1997, respectively.

(11) MARKETABLE SECURITIES AVAILABLE FOR SALE

Marketable  securities  available  for sale at December  31, 1998  include  debt
securities with maturities ranging from March, 1999 to October, 2002. Marketable
securities  at December 31, 1998 include  Corporate  Bonds  ($1,006,890)  and US
Government and agency obligations ($1,050,000).  The carrying value equaled fair
market value. There were no marketable securities at December 31, 1997.

                                      F-18

<PAGE>

                              CELGENE CORPORATION
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                 DECEMBER 31, 1996, 1997 AND 1998 (CONTINUED )

(12) COMMITMENTS AND CONTINGENCIES

(a) Leases

Celgene leases its main laboratory and office facilities in Warren Township, New
Jersey.  The current lease term for the main laboratory and office space expires
in 2002 and has one five-year renewal option. Annual payments are $330,000.  The
lease  provides  that  at the end of  each  five-year  term,  the  rent  will be
increased  based upon the change in the  consumer  price  index,  but in no case
shall  the  increase  be  greater  than 20%.  Celgene  is also  required  to pay
additional  amounts for real estate taxes,  utilities,  and  maintenance.  Total
rental  expense  amounted to $453,000,  $477,000 and $486,000 in 1996,  1997 and
1998, respectively. Celgene has subleased 12,500 square feet of this facility to
Cambrex Corporation for up to three years for the chiral  intermediate  business
which Cambrex purchased on January 9, 1998.

In January,  1997 the Company  entered  into a sub-lease  agreement  to lease an
additional  18,000 square feet of laboratory and office space in Annandale,  New
Jersey.  The sub-lease  agreement is for a two year term,  expiring in February,
1999. Annual payments are $227,500.

In July, 1997, the Company entered into an equipment  leasing  agreement,  Under
the  agreement,  the Company can lease up to $1,000,000 of equipment for a three
year term after which the  Company  can  purchase  the  equipment  for a nominal
value.  Through December 31, 1998, the Company has leased $675,000 of laboratory
equipment  under  this  agreement.  Under this  capital  lease,  the  Company is
committed to 36 monthly payments of approximately $21,000.

(b) Employment Agreements

Celgene has  employment  agreements  with certain  officers and  employees.  The
related  outstanding  commitments over the next two years are approximately $1.6
million, of which $1.0 million is due in 1999.  Employment contracts provide for
an increase  in  compensation  reflecting  annual  reviews  and  related  salary
adjustments.

(c) Contracts

Pursuant  to  the  terms  of a  research  and  development  agreement  with  The
Rockefeller  University,  the Company has the  world-wide  exclusive  license to
manufacture and market any drugs, including THALOMID,  which may result from the
research performed at The Rockefeller  University and funded by the Company. The
Rockefeller  University  is entitled to receive  royalties  based on  commercial
sales of any such drugs for  certain  indications  for ten years after the first
sale. Under terms of the current research  agreement  extension,  the Company is
committed to pay The Rockefeller University $504,000 annually for research.

In December 1995 the Company entered into an agreement with Penn Pharmaceutical,
Ltd. of Great Britain  ("Penn") for the production of THALOMID.  Annual facility
payments are  approximately  $480,000,  which commenced in December,  1996. Penn
will manufacture  THALOMID and sell it exclusively to the Company. The agreement
has been renewed for 1999, for facility payments of approximately $480,000.

In October 1997, the Company  entered into a contract with Boston  University to
manage the surveillance  registry which is intended to monitor compliance to the
requirements  of the  Company's  S.T.E.P.S.  program  (prescription  safety  and
education program) for all THALOMID patients.  The contract has been renewed for
1999.  Under the terms of the  agreement  quarterly  payments  of  approximately
$300,000  are  required.  The  contract  is  renewable  for one year  terms upon
agreement of both parties.

In  December  1997,  the  Company  entered  into a research  agreement  with the
University  of  Glasgow  for  clinical  testing  and  evaluation  of  certain of
Celgene's patented  compounds.  Under terms of the agreement,  Celgene would pay
the University  approximately  $200,000 in two annual installments.  The term of
the agreement is for two years.

In June 1998,  the Company  entered  into a research  agreement  with a contract
research organization to manage the pivotal clinical trial for d-methylphenidate
encompassing  four separate  protocols.  The agreement is for  approximately two
years  and is  estimated  at  approximately  $3.0  million  over the life of the
agreement.

                                      F-19

<PAGE>

                              CELGENE CORPORATION
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                  DECEMBER 31, 1996, 1997 AND 1998 (CONTINUED)

(12) COMMITMENTS AND CONTINGENCIES (CONTINUED)

In December 1998, the Company entered into an exclusive  license  agreement with
EntreMed,  Inc. whereby EntreMed granted to Celgene an exclusive  license to its
patent and technology  rights for  thalidomide.  In return EntreMed will receive
royalties on all sales of THALOMID.

In December 1998, the Company  entered into a one year clinical trial  agreement
with the  University of Arkansas for Medical  Science to collaborate on clinical
trials for multiple  myeloma under four separate  protocols.  The commitment for
1999 is $200,000.

The  Company has various  other  research  and  consulting  agreements  totaling
approximately $336,000 for 1999.

(d) Contingencies

The Company believes it maintains  insurance  coverage  adequate for its current
needs.

The Company's operations are subject to environmental laws and regulations which
impose  limitations  on the discharge of  pollutants  into the air and water and
establish  standards  for the  treatment,  storage  and  disposal  of solid  and
hazardous  wastes.  The Company reviews the effects of such laws and regulations
on its  operation  and  modifies  its  operations  as  appropriate.  The Company
believes that it is in substantial compliance with all applicable  environmental
laws and regulations.

(e) Concentration of Market Risk

Sales to one chain  pharmacy and three  wholesalers  accounted for 27%, 18%, 15%
and 14% of sales  respectively,  in 1998. The direct sales to the chain pharmacy
were  for  the  initial  stocking  order.  All  future  sales  will  be  through
wholesalers.

One customer  accounted  for 100% of the research  contract  revenue in 1996 and
1997. Three customers  accounted for 37%, 28% and 24% of 1998 research  contract
revenue.

(13) SUBSEQUENT EVENT

On January 20, 1999, the Company issued a $15.0 million  convertible  note to an
institutional  investor.  The note has a five year term and a coupon  rate of 9%
with  interest  payable on a semi-annual  basis.  The debt contains a conversion
feature  that  allows the note  holder to convert the debt into shares of common
stock  after one year at a  conversion  price of $18 per share.  The Company can
redeem the note after three years, (two years if the stock trades at 225% of the
conversion  price for a period of 20 consecutive  trading days),  at 103% of the
principal amount. Net proceeds after issuance at a discount were $14.25 million.

                                      F-20

<PAGE>

                              CELGENE CORPORATION
                      CONDENSED CONSOLIDATED BALANCE SHEET
                                  (UNAUDITED)

<TABLE>
<CAPTION>

                                                                                -------------------
                                                                                 SEPTEMBER 30, 1999
                                                                                -------------------
<S>                                                                             <C>

ASSETS
Current assets:
 Cash and cash equivalents ..................................................     $   14,324,499
 Marketable securities available for sale ...................................          4,299,974
 Accounts receivable, net of allowance of $117,512 at September 30, 1999.....          2,941,555
 Inventory ..................................................................          2,072,272
 Other current assets .......................................................            678,527
                                                                                  --------------
   Total current assets .....................................................         24,316,827
Plant and equipment, net ....................................................          2,083,212
Other assets ................................................................            688,732
                                                                                  --------------
   Total assets .............................................................     $   27,088,771
                                                                                  ==============
LIABILITIES AND STOCKHOLDERS' (DEFICIT)
Current liabilities:
 Accounts payable ...........................................................     $    3,041,185
 Accrued expenses ...........................................................          3,826,091
 Capitalized lease obligation ...............................................            214,544
                                                                                  --------------
   Total current liabilities ................................................          7,081,820
Capitalized lease obligation-net of current portion .........................             44,607
Long term convertible notes .................................................         38,458,336
                                                                                  --------------
   Total liabilities ........................................................         45,584,763
                                                                                  --------------
Stockholders' equity (deficit):
 Common stock, $.01 par value per share
   30,000,000 shares authorized at September 30, 1999
   issued and outstanding 17,151,595 shares at September 30, 1999 ...........            171,516
 Additional paid-in capital .................................................        144,944,797
 Accumulated deficit ........................................................       (163,548,803)
 Accumulated other comprehensive loss .......................................            (63,502)
                                                                                  --------------
   Total stockholders' deficit ..............................................        (18,495,992)
                                                                                  --------------
 Total liabilities and stockholders' deficit ................................     $   27,088,771
                                                                                  ==============

</TABLE>

See accompanying notes to consolidated financial statements.

                                      F-21

<PAGE>

                              CELGENE CORPORATION
                CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
                                  (UNAUDITED)

<TABLE>
<CAPTION>

                                                                             -----------------------------------
                                                                               NINE MONTHS ENDED SEPTEMBER 30,
                                                                             ------------------------------------
                                                                                          1999               1998
                                                                             -----------------   ----------------
<S>                                                                          <C>                 <C>

REVENUES:
 Product sales ...........................................................     $  15,063,644      $   1,030,838
 Research contracts ......................................................         1,732,500            105,000
                                                                               -------------      -------------
   Total revenues ........................................................        16,796,144          1,135,838
EXPENSES:
 Cost of goods sold ......................................................         2,076,457             59,270
 Research and development ................................................        14,366,132         13,968,657
 Selling, general and administrative .....................................        17,846,527         11,207,326
                                                                               -------------      -------------
   Total expenses ........................................................        34,289,116         25,235,253
Operating loss ...........................................................       (17,492,972)       (24,099,415)
Other income and expense:
 Interest income .........................................................           511,659            497,100
 Interest expense ........................................................         1,954,420             45,192
                                                                               -------------      -------------
Loss from continuing operations ..........................................       (18,935,733)       (23,647,507)
Discontinued operations: (Note 7)
 Loss from operations ....................................................                --            (59,837)
 Gain on sale of chiral assets ...........................................                --          7,014,830
                                                                               -------------      -------------
Net loss .................................................................       (18,935,733)       (16,692,514)
Accretion of premium payable on preferred stock                                           --             24,648
                                                                               -------------      -------------
Net loss applicable to common stockholders ...............................     $ (18,935,733)     $ (16,717,162)
                                                                               =============      =============
Per share basic and diluted:
 Loss from continuing operations .........................................     $       (1.12)     $       (1.47)
 Discontinued operations:
   Loss from operations ..................................................                --                 --
   Gain on sale of chiral assets .........................................                --               0.44
                                                                               -------------      -------------
   Net loss applicable to common stockholders per share of common stock ..     $       (1.12)     $       (1.04)
                                                                               =============      =============
Weighted average number of shares of common stock outstanding ............        16,903,000         16,062,000
                                                                               =============      =============
</TABLE>

See accompanying notes to consolidated financial statements.

                                      F-22

<PAGE>

                              CELGENE CORPORATION
                CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
                                  (UNAUDITED)

<TABLE>
<CAPTION>

                                                                          ---------------------------------
                                                                             THREE MONTHS PERIODS ENDED
                                                                                      SEPTEMBER
                                                                                         30,
                                                                          ---------------------------------
                                                                                     1999              1998
                                                                          ---------------   ---------------
<S>                                                                       <C>               <C>

REVENUES:
 Product sales ........................................................    $  6,315,319      $  1,030,838
 Research contracts ...................................................         425,000            25,000
                                                                           ------------      ------------
   Total revenues .....................................................       6,740,319         1,055,838
EXPENSES:
 Cost of goods sold ...................................................         701,816            59,270
 Research and development .............................................       4,933,317         5,238,106
 Selling, general and administrative ..................................       6,618,373         3,876,150
                                                                           ------------      ------------
   Total expenses .....................................................      12,253,506         9,173,526
Operating loss ........................................................      (5,513,187)       (8,117,688)
Other income and expense:
 Interest income ......................................................         256,215           136,262
 Interest expense .....................................................         861,397            39,086
                                                                           ------------      ------------
Net loss ..............................................................    $ (6,118,369)     $ (8,020,512)
                                                                           ============      ============
Per share basic and diluted:
 Net loss .............................................................    $      (0.36)     $      (0.49)
                                                                           ============      ============
Weighted average number of shares of common stock outstanding .........      17,028,000        16,399,000
                                                                           ============      ============
</TABLE>

See accompanying notes to consolidated financial statements.

                                      F-23

<PAGE>

                              CELGENE CORPORATION
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
                                  (UNAUDITED)

<TABLE>
<CAPTION>

                                                                                -------------------------------------
                                                                                   NINE MONTHS ENDED SEPTEMBER 30,
                                                                                -------------------------------------
                                                                                             1999                1998
                                                                                -----------------   -----------------
<S>                                                                             <C>                 <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
Loss from continuing operations .............................................     $ (18,935,733)      $ (23,647,507)
Adjustments to reconcile loss from continuing operations to
 net cash used in operating activities:
 Depreciation ...............................................................           585,497             575,575
 Issuance of stock for employee benefits ....................................           799,004             463,606
 Provision for doubtful accounts ............................................            74,126                  --
 Amortization of debt issuance costs ........................................           187,500                  --
 Amortization of discount on convertible note ...............................           109,377                  --
Change in current assets & liabilities:
 Increase in inventory ......................................................          (500,864)           (317,437)
 Increase (Decrease) in accounts payable and accrued expenses ...............          (822,440)         (1,984,036)
 (Increase) Decrease in accounts receivable .................................          (353,292)            388,063
 (Increase) Decrease in other assets ........................................          (496,534)            129,648
                                                                                  -------------       -------------
Net cash used in continuing operations ......................................       (19,353,359)        (20,424,016)
Net cash used in discontinued operations ....................................                --             (59,837)
                                                                                  -------------       -------------
Net cash used in operating activities .......................................       (19,353,359)        (20,483,853)
                                                                                  -------------       -------------
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures ........................................................          (406,579)           (645,104)
Proceeds from sales and maturities of marketable
 securities available for sale ..............................................         2,495,992           7,086,154
Purchases of marketable securities available for sale .......................        (4,802,578)        (10,116,494)
Proceeds from sale of chiral assets .........................................                --           7,500,000
                                                                                  -------------       -------------
Net cash provided by (used in) investing activities .........................        (2,713,165)          3,824,556
                                                                                  -------------       -------------
CASH FLOWS FROM FINANCING ACTIVITIES:
Costs related to secondary public offering ..................................                --             (73,136)
Proceeds from the sale of stock .............................................                --           2,500,000
Proceeds from exercise of common stock options and warrants .................         4,235,869           1,673,740
Capital lease buyout ........................................................          (161,799)           (329,614)
Capital lease funding .......................................................                --             260,195
Debt issuance costs .........................................................          (750,000)           (437,500)
Proceeds from convertible notes .............................................        30,000,000           8,750,000
                                                                                  -------------       -------------
Net cash provided by (used in) financing activities .........................        33,324,070          12,343,685
                                                                                  -------------       -------------
Net (decrease) increase in cash and cash equivalents ........................        11,257,546          (4,315,612)
Cash and cash equivalents at beginning of period ............................         3,066,953          13,583,445
                                                                                  -------------       -------------
Cash and cash equivalents at end of period ..................................     $  14,324,499       $   9,267,833
                                                                                  =============       =============
NON-CASH INVESTING ACTIVITY:
Change in net unrealized loss on marketable securities available for sale....     $     (63,502)      $          --
                                                                                  =============       =============
NON-CASH FINANCING ACTIVITIES:
Issuance of common stock upon the conversion of Series A convertible
 preferred stock and accretion thereon, net .................................     $          --       $   4,054,103
                                                                                  =============       =============
Accretion of premium payable on preferred stock and warrants ................     $          --       $      24,648
                                                                                  =============       =============
INTEREST PAID ...............................................................     $   1,080,693       $      11,468
                                                                                  =============       =============
</TABLE>
See accompanying notes to consolidated financial statements.

                                      F-24

<PAGE>

                              CELGENE CORPORATION
        NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
                              SEPTEMBER 30, 1999

1. Basis of Presentation

The unaudited  condensed  consolidated  financial  statements have been prepared
from the books and records of Celgene  Corporation (the "Company") in accordance
with generally accepted accounting  principles for interim financial information
pursuant to Rule 10-01 of Regulation S-X.  Accordingly,  they do not include all
of the  information  and  footnotes  required by generally  accepted  accounting
principles for complete financial statements.

In the  opinion  of  management,  all  adjustments  (consisting  only of  normal
recurring  accruals)  considered  necessary  for a fair  presentation  have been
included.  Interim  results may not be  indicative  of the  results  that may be
expected for the year.

The  interim  condensed  consolidated  financial  statements  should  be read in
conjunction  with  the  consolidated  financial  statements  and  notes  thereto
included in the Company's latest annual report on Form 10-K.

2. Series A Convertible A Preferred Stock

The Series A Convertible  Preferred Stock ("Preferred Stock"), plus accretion at
a rate of 4.9% per year, was convertible into common stock of the Company at the
option of the holders  thereof at a  conversion  price per share of Common Stock
equal, generally, to the lesser of (i) $18.81 or (ii) 90% of the average closing
price per share of the Common Stock for the seven trading days immediately prior
to the date of conversion.

As of February 23, 1998,  all 503 shares of the Series A Preferred  Stock,  with
their respective accretion, had been converted or redeemed into 3,342,202 shares
of common stock.  Through  February 23, 1998 the Company had accrued  $1,420,770
representing accretion of the premium on the Preferred Stock.

3. Warrants to Acquire Common Stock

Under  the  terms of a  private  placement  of  Series B  Preferred  Stock  with
Chancellor LGT Asset  Management,  Inc.  ("Chancellor")  entered into on June 9,
1997, upon the request of the purchasers of the Series B Preferred,  the Company
is obligated to issue  warrants to  Chancellor  to acquire a number of shares of
Common Stock equal to (i) 1,500,000  divided by the  Conversion  Price ($6.50 at
September  30,  1999) in effect on the  issuance  date  (230,769  warrants as of
September 30, 1999) plus (ii) 37.5% of the  conversion  shares  issuable on such
issuance date upon  conversion of all shares of Series B Preferred  Stock issued
through the issuance date (288,461  warrants as of September 30, 1999). All such
warrants  will have a term of four years from the issuance  date and an exercise
price equal to 115% of the Conversion Price in effect on the  issuance date.  As
of September 30, 1999, no warrants have been issued.

4. Stock Based Compensation

On June 22, 1999,  an amendment to the 1995  Non-Employee  Directors'  Incentive
Plan was approved by the Company's  stockholders.  The  amendment  increased the
number of shares  that may be issued  upon  exercise  of  options  granted  from
350,000   shares  to  600,000   shares.   The  amendment  also  provides  for  a
discretionary grant upon the date of each annual meeting of an additional option
to purchase up to 5,000 shares to a non-employee director who serves as a member
(but not a chairman) of a committee of the Board of Directors,  and up to 10,000
shares to a  non-employee  director who serves as the chairman of a committee of
the Board of Directors.

5. Convertible Debt

On  September  16,  1998,  the Company  issued to an  institutional  investor an
$8,750,000  convertible  note due September 16, 2003. The proceeds were net of a
5% fee or  $437,500,  the  cost of which  will be  amortized  over a three  year
period. The note bears interest at 9.25% which is payable semi-annually on March
16 and September 16 each year.  The Company may, at its  election,  pay all or a
portion of the interest on this security in shares of Common Stock.  The note is
convertible  into  795,463  shares of Common  Stock at a price  equal to $11 per
share which was 125% of the fair market value of the  Company's  Common Stock at
the date of issuance.  The Company can, at its election,  redeem the Security in
three  years,  (two years under  certain  conditions)  at 103% of the  principal
amount.

                                      F-25

<PAGE>

                               CELGENE CORPORATION
         NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
                         SEPTEMBER 30, 1999 (CONTINUED )

On  January  20,  1999,  the  Company  issued  to an  institutional  investor  a
convertible note in the amount of $15,000,000. The note has a five year term and
a coupon  rate of 9% with  interest  payable on a  semi-annual  basis.  The note
contains a conversion feature that allows the note holder to convert the note in
to shares of common  stock  after one year at $18 per  share.  The  Company  can
redeem the note after three years at 103% of the  principal  amount,  (two years
under certain conditions). This note was subject to an issuance cost of $750,000
or 5%, which is being amortized over three years.

On July 6, 1999, the Company issued to an  institutional  investor a convertible
note in the  amount of  $15,000,000.  The note has a five year term and a coupon
rate of 9% with  interest  payable on a semi-annual  basis.  The note contains a
conversion  feature  that allows the note holder to convert the note into shares
of common stock after one year at $19 per share. The Company can redeem the note
after  three years at 103% of the  principal  amount,  (two years under  certain
conditions). There was no fee or discount associated with this note.

6. Marketable Securities Available for Sale

Marketable  securities  available  for sale at  September  30, 1999 include debt
securities with  maturities  ranging from January 2000 to August 2004. A summary
of marketable securities at September 30, 1999 is as follows:

<TABLE>
<CAPTION>

                                     -----------------------------------------------------------
                                                            GROSS          GROSS       ESTIMATED
                                                       UNREALIZED     UNREALIZED            FAIR
                                              COST           GAIN           LOSS           VALUE
                                     -------------   ------------   ------------   -------------
<S>                                  <C>             <C>            <C>            <C>
Government Bonds & Notes .........   $2,313,476              --     $(15,557)      $2,297,919
Government Agencies ..............    2,050,000              --      (47,945)       2,002,055
                                     ----------      ----------     --------       ----------
Total ............................   $4,363,476              --     $(63,502)      $4,299,974
                                     ==========      ----------     ========       ==========
</TABLE>

7. Discontinued Operations

On January 9, 1998,  the   Company  sold its  chiral  intermediate  business  to
Cambrex Corporation for approximately $15.0 million.  The terms of the agreement
provided for the sale of chiral assets of approximately $485,000 for proceeds of
$7.5 million on the contract date plus future royalties with a present value not
exceeding  $7.5  million,  with certain  minimum  royalty  payments in the third
through  sixth year  following the closing of the  transaction.  Included in the
transaction  are  the  rights  to the  Company's  enzymatic  technology  for the
production  of  chirally  pure  intermediate  for the  pharmaceutical  industry,
including  the current  pipeline of third party  products and the  equipment and
personnel associated with the business.

8. Comprehensive Income and Recently Issued Accounting Pronouncement

Comprehensive  income includes net income and other  comprehensive  income which
refers to those revenues, expenses, gains and losses which are excluded from net
income.  Other  comprehensive  income  includes  unrealized  gains and losses on
marketable securities classified as available-for-sale,  which prior to adoption
were reported separately in shareholders' equity.

<TABLE>
<CAPTION>

                                     ------------------------------------------
                                                 NINE MONTHS ENDED
                                     ------------------------------------------
                                       SEPTEMBER 30, 1999    SEPTEMBER 30, 1998
                                     --------------------   -------------------
<S>                                  <C>                    <C>
Net Loss .........................   $(18,935,733)             $(16,692,514)
Other Comprehensive Loss .........        (63,502)                      --
                                     ------------              ------------
Total Comprehensive Loss .........   $(18,999,235)             $(16,692,514)
                                     ============              ============
</TABLE>

<TABLE>
<CAPTION>

                                     ------------------------------------------
                                                 THREE MONTHS ENDED
                                     ------------------------------------------
                                       SEPTEMBER 30, 1999    SEPTEMBER 30, 1998
                                     --------------------   -------------------
<S>                                  <C>                    <C>
Net Loss .........................   $(6,118,369)              $(8,020,512)
Other Comprehensive Loss .........       (12,072)                       --
                                     -----------               -----------
Total Comprehensive Loss .........   $(6,130,441)              $(8,020,512)
                                     ===========               ===========
</TABLE>

                                      F-26

<PAGE>

                               CELGENE CORPORATION
         NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
                         SEPTEMBER 30, 1999 (CONTINUED)

In June 1998, SFAS No. 133,  "Accounting for Derivative  Instruments and Hedging
Activities",  was issued and is effective for all fiscal  quarters of all fiscal
years  beginning  after  June  15,  2000.  SFAS  No.  133  requires   derivative
instruments to be recognized as Assets and  Liabilities  and be recorded at Fair
Value.  The Company is currently not party to any  Derivative  Instruments.  Any
future transactions  involving Derivative Instruments will be evaluated based on
SFAS No. 133.

9.  SUBSEQUENT EVENTS

In November,  1999, we signed an amendment to The Rockefeller University License
Agreement  pursuant  to which we agreed to a lump sum  payment  and issue  stock
opitons to The Rockefeller University and the inventors in lieu of the royalties
previously payable under the license.

In December, 1999, we entered into a lease with our current landlord  to rent an
additional  29,000 square feet of office and  laboratory  space  adjacent to our
current leased space.  The lease has a ten-year term with two five-year  renewal
options. The annual commitment is approximately $260,000.

                                      F-27

<PAGE>

                               [GRAPHIC OMITTED]

<PAGE>

                                    PART II
                    INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.

An estimate of the fees and  expenses of issuance and  distribution  (other than
underwriting discounts) of the common stock offered hereby (all of which will be
paid by Celgene) is as follows:

<TABLE>

<S>                                                     <C>
         SEC registration fee .......................       $45,569
         NASDAQ National Market listing fee .........        17,500
         NASD filing fee ............................        17,761
         Legal fees and expenses ....................            *
         Accounting fees and expenses ...............            *
         Printing fees ..............................            *
         Miscellaneous expenses .....................            *
                                                            -------
            Total ...................................       $    *
                                                            =======

</TABLE>

     * To be filed by amendment.

ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS.

The  General  Corporation  Law of the State of  Delaware,  or the 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,  or the Charter,  eliminates the
liability of directors  of Celgene to Celgene or its  stockholders  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.

ITEM 16. EXHIBITS.

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

(a) Exhibits

<TABLE>
<CAPTION>
EXHIBIT

NUMBER       DESCRIPTION
<S>          <C>

 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).
23.3 --      Consent of Pennie & Edmonds LLP.
23.4 --      Consent of Kleinfeld, Kaplan & Becker.
23.5 --      Consent of Mathew, Collins, Shepherd & Gould, P.A.
24.1 --      Power of Attorney (included in Signature Page).
</TABLE>

                                      II-1

<PAGE>

ITEM 17. UNDERTAKINGS.

The undersigned registrant hereby undertakes that:

   (1) For purposes of  determining  any liability  under the  Securities Act of
       1933, the information  omitted from the form of prospectus  filed as part
       of this  registration  statement in reliance upon Rule 430A and contained
       in a  form  of  prospectus  filed  by the  registrant  pursuant  to  Rule
       424(b)(1) or (4) or 497(h) under the Securities Act shall be deemed to be
       part of  this  registration  statement  as of the  time  it was  declared
       effective.

   (2) For the purpose of determining  any liability under the Securities Act of
       1933,  each  post-effective  amendment that contains a form of prospectus
       shall  be  deemed  to  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.

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-2

<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 January 18, 2000.

                                    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:

<TABLE>
<CAPTION>

          SIGNATURE                                  TITLE                               DATE
          ---------                                  -----                               ----
<S>                             <C>                                               <C>
 /s/   John W. Jackson          Chairman of the Board and Chief Executive         January 18, 2000
- --------------------------      Officer (Principal Executive Officer)
       John W. Jackson


/s/      Sol J. Barer
- --------------------------      President, Chief Operating Officer                January 18, 2000
         Sol J. Barer           and Director


/s/    Robert J. Hugin
- --------------------------      Chief Financial Officer (Principal Accounting     January 18, 2000
       Robert J. Hugin          and Financial Officer)


/s/     Jack L. Bowman
- --------------------------      Director                                          January 18, 2000
        Jack L. Bowman


/s/     Frank T. Cary
- --------------------------      Director                                          January 18, 2000
        Frank T. Cary



- --------------------------      Director                                          January 18, 2000
         Gilla Kaplan



- --------------------------      Director                                          January 18, 2000
     Arthur Hull Hayes, Jr.

</TABLE>

                                      II-3

<PAGE>

<TABLE>
<CAPTION>

          SIGNATURE                                  TITLE                               DATE
          ---------                                  -----                               ----
<S>                             <C>                                               <C>


- --------------------------      Director                                           January 18, 2000
    Richard C. E. Morgan


/s/     Walter L. Robb
- --------------------------      Director                                           January 18, 2000
        Walter L. Robb


/s/    Lee J. Schroeder
- --------------------------      Director                                           January 18, 2000
       Lee J. Schroeder

</TABLE>

                                      II-4

<PAGE>

                               INDEX TO EXHIBITS

<TABLE>
<S>       <C>

 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)
23.3 --   Consent of Pennie & Edmonds LLP
23.4 --   Consent of Kleinfeld, Kaplan & Becker
23.5 --   Consent of Mathew, Collins, Shepherd & Gould, P.A.
24.1 --   Power of Attorney (included in Signature Page).
</TABLE>



                       [LETTERHEAD OF PROSKAUER ROSE LLP]

                                                                     EXHIBIT 5.1

                                    January 18, 2000

Celgene Corporation
7 Powder Horn Drive
Warren, NJ 07059

Ladies and Gentlemen:

     You have  requested  our opinion in  connection  with the filing by Celgene
Corporation,  a Delaware  corporation (the  "Company"),  with the Securities and
Exchange  Commission of a Registration  Statement on Form S-3 (the "Registration
Statement") under the Securities Act of 1933, as amended (the "Securities Act"),
with respect to 2,000,000 shares of common stock, $.01 par value, of the Company
and 416,000  shares of common  stock of the Company  (collectively,  the "Common
Stock") to be issued to the selling stockholder upon conversion of the Company's
9.0% Convertible Notes issued in January 1999.

     We have examined such records,  documents and other  instruments as we have
deemed relevant and necessary as a basis for the opinions hereinafter set forth.
We have also assumed  without  investigation  the  authenticity  of any document
submitted to us as a copy, the conformity to originals of any document submitted
to us as a copy, the authenticity of the originals of such latter documents, the
genuineness of all signatures and the legal capacity of natural  persons signing
such documents. We have also relied on certain matters contained in certificates
of public officials and officers of the Company.

     Based upon the  foregoing,  we are of the opinion that the Common Stock (to
the  extent  issued  by the  Company  and sold by the  Company  and the  selling
stockholder) have been duly authorized and, when issued,  delivered and paid for
in accordance  with the plan of  distribution  as described in the  Registration
Statement, will be validly issued, fully paid and non-assessable.

     We hereby  consent  to the filing of this  opinion  as  Exhibit  5.1 to the
Registration Statement and to the reference in our firm under the caption "Legal
Matters" in the Prospectus contained in the Registration Statement. In so doing,
we do not admit that we are in the category of persons whose consent is required
under  Section  7 of the  Securities  Act or the rules  and  regulations  of the
Securities and Exchange Commission thereunder.

                                    Very truly yours,

                                    /s/ Proskauer Rose LLP



                                                                    EXHIBIT 23.1



                        CONSENT OF INDEPENDENT AUDITORS

THE BOARD OF DIRECTORS
CELGENE CORPORATION:

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

/s/ KPMG LLP
- -----------------
    KPMG LLP

Short Hills, New Jersey
January 18, 2000





                                                                    EXHIBIT 23.3

                     [LETTERHEAD OF PENNIE & EDMONDS, LLP]

                                  January 18, 2000


Mr. Joseph J. Day, Jr.
Senior Vice President
Planning and Business Development
Celgene Corporation
7 Powder Horn Drive
Warren, NJ 07059

       Re: S-3 Registration Statement

Dear Mr. Day:

         We consent to the  following  reference  to our firm under the  heading
"Experts" in the Prospectus:

         -- The statements in this Prospectus that relate  to U.S. patent rights
     licensed from The Rockefeller  University and  EntreMed/Children's  Medical
     Center  Corporation under the captions "Risk Factors--We may not be able to
     protect our intellectual  property" and  "Business--Patents and Proprietary
     Technology"  have been  reviewed  and  approved  by Pennie & Edmonds LLP as
     special patent counsel to us for these matters,  and are included herein in
     reliance  upon their review and approval as experts in United States Patent
     Law.--


                                        Very truly yours,

                                        /s/ Pennie & Edmonds LLP

                                        Pennie & Edmonds LLP



                                                                    EXHIBIT 23.4

                  [LETTERHEAD OF KLEINFELD, KAPLAN AND BECKER]




                                January 18, 2000


JOSEPH DAY, JR., SENIOR VICE PRESIDENT
OF PLANNING AND BUSINESS DEVELOPMENT
CELGENE CORPORATION
7 POWDER HORN DRIVE
WARREN, NJ 07059


     RE: S-3 REGISTRATION STATEMENT

Dear Joe:

     This will confirm that Kleinfeld,  Kaplan and Becker hereby consents to the
use of our name in Celgene's current S-3 Registration Statement.


                                       Very truly yours,

                                       Kleinfeld, Kaplan and Becker

                                       /s/ Alan H. Kaplan
                                       ----------------------
                                           Alan H. Kaplan




            [LETTERHEAD OF MATHEWS, COLLINS, SHEPHERD & GOULD, P.A.]




                                January 18, 2000


JOSEPH DAY, JR., SENIOR VICE PRESIDENT
OF PLANNING AND BUSINESS DEVELOPMENT
CELGENE CORPORATION
7 POWDER HORN DRIVE
WARREN, NJ 07059


     RE: S-3 REGISTRATION STATEMENT

Dear Joe:

    This will confirm  that  Mathews,  Collins,  Shepherd & Gould,  P.A.  hereby
consents to the use of our name in Celgene's current S-3 Registration Statement.


                                       Very truly yours,

                                       Mathews, Collilns, Shepherd & Gould, P.A.

                                       /s/ Bruce M. Collins
                                       ----------------------
                                           Bruce M. Collins

BMC:ds


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