CELGENE CORP /DE/
S-3/A, 2000-02-10
COMMERCIAL PHYSICAL & BIOLOGICAL RESEARCH
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    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON FEBRUARY 10, 2000
                                                      REGISTRATION NO. 333-94915

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

                                 AMENDMENT NO. 2

                                       TO
                                    FORM S-3
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

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

<TABLE>
<S>                                   <C>                              <C>
              DELAWARE                             8731                     22-2711928
  (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:

<TABLE>
<S>                                               <C>
               Robert A. Cantone, Esq.                    Gerald S. Tanenbaum, Esq.
                  Proskauer Rose LLP                       Cahill Gordon & Reindel
 1585 Broadway, New York, New York 10036-8299     80 Pine Street, New York, New York 10005
                 (212) 969-3000                                (212) 701-3000
</TABLE>


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. [ ]


<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     FEE (3)
- ---------------------------------------------------------------------------------------------------------------------
<S>                                      <C>                    <C>                 <C>                <C>       <C>
Common Stock,
 par value $.01 per share.................671,600 shares        $ 100.25            $67,327,900        $  17,775 (3)
- ---------------------------------------------------------------------------------------------------------------------
</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 February 8, 2000.  Estimated pursuant to Rule 457
     under the Securities Act of 1933, solely for the purpose of calculating the
     registration fee.
(3)  Registration  fee in the amount of $45,567  paid on  January  19,  2000 for
     2,778,400 shares.

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

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 FEBRUARY 10, 2000


PROSPECTUS


3,000,000 Shares


[CELGENE CORPORATION LOGO OMITTED]


CELGENE CORPORATION

Common Stock


Celgene Corporation is selling 2,484,000 shares of common stock in this offering
and the selling stockholders are selling 516,000 shares.

Our  common  stock is traded on the  Nasdaq  National  Market  under the  symbol
"CELG." On February 8, 2000,  the  reported  last sale price of our common stock
was $99 3/4 per share.


INVESTING  IN  OUR  COMMON STOCK INVOLVES RISKS. SEE "RISK FACTORS" BEGINNING ON
PAGE 8.


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 STOCKHOLDERS
<S>                                              <C>        <C>             <C>           <C>
- ---------------------------------------------------------------------------------------------------------------
Per Share                                        $          $               $             $
- ---------------------------------------------------------------------------------------------------------------
Total                                            $          $               $             $
- ---------------------------------------------------------------------------------------------------------------
</TABLE>


We have  granted the  underwriters  the right to  purchase  up to an  additional
450,000 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 CANCER, 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
                                                                           -----
<S>                                                                          <C>
Prospectus Summary ....................................................       2
Risk Factors ..........................................................       8
Forward-Looking Statements ............................................      13
Use of Proceeds .......................................................      14
Price Range of Common Stock ...........................................      14
Dividend Policy .......................................................      14
Capitalization ........................................................      15
Selected Consolidated Financial Data ..................................      16
Management's Discussion and Analysis
   of Financial Condition and Results of
   Operations .........................................................      17

<CAPTION>

                                                                            PAGE
                                                                           -----
<S>                                                    <C>
Business ..............................................................      21
Management ............................................................      34
Selling Stockholders ..................................................      37
Description of Capital Stock ..........................................      38
Shares Eligible for Future Sale .......................................      40
Underwriting ..........................................................      41
Legal Matters .........................................................      43
Experts ...............................................................      43
Where You Can Find More Information ...................................      43
Index to Consolidated Financial Statements ............................     F-1
</TABLE>

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

We own or have the right to various  trademarks,  service  marks and trade names
used  in  our  business.   These  include   THALOMID(Reg.   TM)   (thalidomide),
S.T.E.P.S.(TM), IMiDs(TM), SelCIDs(TM), 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-, and are anti-angiogenic. TNF- 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-  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 have been found in research to be  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


                                        2

<PAGE>



continue  to  expand.   We  anticipate   selectively   partnering   with  larger
pharmaceutical companies with respect to 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.


                                        3

<PAGE>



                            RECENT OPERATING RESULTS

On January 27, 2000, we announced our operating results for the three months and
year ended December 31, 1999. Total revenues for the three months ended December
31,  1999 were $9.4  million,  consisting  of product  sales of THALOMID of $9.0
million and $425,000 of revenues  from research  contracts.  The $9.0 million of
THALOMID  sales for the three  months ended  December 31, 1999  represents a 43%
increase  over the $6.3  million of THALOMID  sales for the three  months  ended
September 30, 1999. Research and development expenses for the three months ended
December 31, 1999 increased to $5.2 million, primarily due to increased clinical
trial costs for ATTENADE. Selling, general and administrative expenses increased
to $8.4 million for the three months ended  December 31, 1999,  primarily due to
the  expansion of our sales and  commercialization  organization  and  increased
warehousing  and  distribution  expenses.  The net  loss  applicable  to  common
stockholders  for the three months ended December 31, 1999 was $2.8 million,  or
$0.16 per share.  The net loss applicable to common  stockholders  for the three
months and year ended  December 31, 1999  includes a tax benefit of $3.0 million
from the sale of a portion of our New Jersey tax loss carryforwards.





                                        4

<PAGE>



                               CELGENE CORPORATION

                           CONSOLIDATED FINANCIAL DATA

<TABLE>
<CAPTION>
                                                                       ---------------------------------------------------
                                                                          THREE MONTHS ENDED            YEAR ENDED
                                                                             DECEMBER 31,              DECEMBER 31,
                                                                       ------------------------- -------------------------
                                                                                1998        1999         1998         1999
                                                                       ------------- ----------- ------------ ------------
                                                                              (UNAUDITED)               (UNAUDITED)
<S>                                                                    <C>           <C>         <C>          <C>
In thousands, except per share data
STATEMENTS OF OPERATIONS DATA:
Revenues:
 Product sales .......................................................   $ 2,235      $  8,988    $   3,266    $  24,052
 Research contracts ..................................................       430           425          535        2,158
                                                                         -------      --------    ---------    ---------
   Total Revenues ....................................................     2,665         9,413        3,801       26,210
Expenses:
 Cost of goods sold ..................................................       223           906          282        2,983
 Research and development ............................................     5,804         5,280       19,772       19,646
 Selling, general and administrative .................................     5,011         8,389       16,219       26,236
                                                                         -------      --------    ---------    ---------
   Total expenses ....................................................    11,038        14,575       36,273       48,865
                                                                         -------      --------    ---------    ---------
Operating loss .......................................................    (8,373)       (5,162)     (32,472)     (22,655)
Other--income (expense), net .........................................        (2)         (701)         449       (2,144)
                                                                         ----------   --------    ---------    ---------
Loss before tax benefit ..............................................    (8,375)       (5,863)     (32,023)     (24,799)
Tax benefit ..........................................................        --         3,018           --        3,018
                                                                         ---------    --------    ---------    ---------
Loss from continuing operations ......................................    (8,375)       (2,845)     (32,023)     (21,781)
Gain from discontinued operations, net ...............................        --            --        6,955           --
Accretion of premium payable on preferred stock and warrants .........        --            --           25           --
                                                                         ---------    --------    ---------    ---------
Net loss applicable to common stockholders ...........................   $(8,375)     $ (2,845)   $ (25,093)   $ (21,781)
                                                                         =========    ========    =========    =========
Per share--basic and diluted:
 Loss from continuing operations, net ................................   $ (0.51)     $  (0.16)   $   (1.98)   $   (1.28)
 Net loss applicable to common stockholders ..........................   $ (0.51)     $  (0.16)   $   (1.55)   $   (1.28)
                                                                         =========    ========    =========    =========
Weighted average number of shares of common stock
 outstanding .........................................................    16,449        17,334       16,160       17,012
</TABLE>

<TABLE>
<CAPTION>
                                                                        ---------------------------
                                                                               DECEMBER 31,
                                                                        ---------------------------
                                                                                 1998          1999
                                                                        ------------- -------------
                                                                                (UNAUDITED)
<S>                                                                     <C>           <C>
In thousands
BALANCE SHEET DATA:
Cash and cash equivalents and marketable securities available for sale   $    5,124    $   19,527
Total assets ..........................................................      11,928        32,334
Long term convertible notes ...........................................       8,349        38,495
Accumulated deficit ...................................................    (144,613)     (166,394)
Total stockholders' deficit ...........................................      (3,733)      (15,709)
</TABLE>

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.


                                        5

<PAGE>



                                  THE OFFERING

The  following  information  is based  on  17,703,646  shares  of  common  stock
outstanding as of December 31, 1999.  This number excludes  4,880,624  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 stockholders  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.


COMMON STOCK OFFERED BY CELGENE ................   2,484,000 shares
COMMON STOCK OFFERED BY THE SELLING
 STOCKHOLDERS ..................................   516,000 shares
COMMON STOCK OUTSTANDING AFTER THIS OFFERING ...   20,703,646 shares
OVER-ALLOTMENT OPTION ..........................   450,000 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  our  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 stockholders.
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



                                        6

<PAGE>



                       SUMMARY CONSOLIDATED FINANCIAL DATA


The as  adjusted  balance  sheet data below is  adjusted  to reflect the sale of
2,484,000  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 $99.75 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  stockholders into 516,000 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
STATEMENTS 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      $  251,057
Total assets ..........................................................        27,089         259,522
Long term convertible notes ...........................................        38,458          29,171
Accumulated deficit ...................................................      (163,549)       (163,479)
Total stockholders' equity (deficit) ..................................       (18,496)        222,945
</TABLE>


                                        7

<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.


                                        8

<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  and  approval  of the
operations  of a new  supplier  or new  manufacturer  could cause a delay in the
manufacture  of  THALOMID  which  could  have a material  adverse  effect on our
business,  financial condition and results of operations.  We intend to continue
to  utilize  outside  manufacturers  if and when  needed  to  produce  our other
products on a commercial  scale.  If our outside  manufacturers  do not meet our
requirements for quality, quantity or timeliness, or do not achieve and maintain
compliance with all applicable  regulations,  our business,  financial condition
and results of operations could be materially adversely affected.

WE HAVE LIMITED MARKETING AND DISTRIBUTION CAPABILITIES.

Although we have a 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


                                        9

<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   INDUSTRIES  ARE  SUBJECT  TO  EXTENSIVE
GOVERNMENT REGULATION AND THERE IS NO ASSURANCE OF REGULATORY APPROVAL.

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

o    in general,  preclinical tests and clinical trials can take many years, and
     require the  expenditure  of substantial  resources,  and the data obtained
     from these tests and 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;


                                       10
<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 or regulatory enforcement actions by FDA concerning
our marketing  practices  would have a material  adverse effect on our business,
financial condition and results of operations.

WE MAY NOT BE ABLE TO PROTECT OUR INTELLECTUAL PROPERTY.

Our success will depend,  in part, on our ability to obtain and enforce patents,
protect trade  secrets,  obtain  licenses to technology  owned by third parties,
when necessary, and conduct our business without infringing upon the proprietary
rights of others. The patent positions of pharmaceutical firms,  including ours,
can be uncertain and involve complex legal and factual  questions.  In addition,
the  coverage  sought  in a patent  application  may not be  obtained  or may be
significantly reduced before the patent is issued. Consequently,  we do not know
whether any of our pending  applications  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,

                                       11
<PAGE>



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

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
February  8,  2000,  our common stock closed at a price of $99 3/4. 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 2,327,267 shares of common stock, of which 967,234
were currently  exercisable,  and warrants  either  outstanding or issuable upon
demand that are exercisable for 551,044 shares of common stock. In addition, the
9.25%  convertible  note  issued on  September  16, 1998 can be  converted  into
795,463 shares of common stock, the 9.0% convertible notes issued on January 20,
1999  can be  converted  into  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 stockholders will
convert a portion of our 9.0%  convertible  notes issued in January 1999 held by
them into 516,000 shares of our common stock.  Upon issuance or conversion,  all
of these shares of common stock will be freely tradable.



                                       12

<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 negative book value
was $(19.1)  million and on a pro forma basis our net tangible  book value after
this offering will be $222.7 million. The amount of the increase in net tangible
book value attributable to the investors in this offering will be $36.5 million,
or $12.16  per share of common  stock.  Investors  of our  common  stock in this
offering will  experience  immediate and substantial  dilution of  approximately
$266.1 million, or $88.70 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."


                                       13

<PAGE>



                                 USE OF PROCEEDS


We  estimate  that the net  proceeds  from the sale of  2,484,000  shares of our
common stock offered by us will be approximately $232.4 million,  $274.6 million
if the underwriters'  over-allotment  option is exercised in full, at an assumed
public   offering  price  of  $99.75  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 stockholders.


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 February 8, 2000) .........   $104 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  February 8, 2000 was $99 3/4. 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.


                                       14

<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 2,484,000 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  $99.75  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 into 516,000  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      $  251,057
                                                                                           ==========      ==========
Capital lease obligation-net of current portion .......................................    $       45      $       45
Long term convertible notes ...........................................................        38,458          29,171
Stockholders' equity (deficit):
 Common stock, $.01 par value per share; 30,000,000 shares authorized; 17,151,595
   shares issued and outstanding; 20,151,595 shares issued and outstanding as adjusted            172             202
 Additional paid-in capital ...........................................................       144,945         386,286
 Accumulated deficit ..................................................................      (163,549)       (163,479)
 Accumulated other comprehensive loss .................................................           (64)            (64)
                                                                                           ----------      ----------
   Total stockholders' equity (deficit) ...............................................       (18,496)        222,945
                                                                                           ----------      ----------
     Total capitalization .............................................................    $   20,007      $  252,161
                                                                                           ==========      ==========
</TABLE>


The above table excludes,  as of September 30, 1999,  2,002,313 shares of common
stock reserved for issuance upon  conversion of our convertible  notes,  602,833
shares  reserved  for issuance  upon  exercise of our  outstanding  warrants and
2,768,756  shares reserved for issuance upon exercise of our  outstanding  stock
options.


                                       15

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

                                       16
<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 of the sale  provided for a
payment of $7.5 million at closing and an additional  amount of future royalties
not to exceed the net present  value on the date of  contract  of $7.5  million,
with a guarantee of certain minimum  payments  beginning in the third year 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.


                                       17

<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.

                                       18
<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.  As
of  December  31,  1999,  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

                                       19
<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.



                                       20

<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-
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-  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 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- 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.



                                       21

<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                            Myeloma  Phase II trial  data
                                                   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)                     Initial Phase II trials completed
                                                   Other 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                     Initial Phase II trial completed
               Sarcoidosis                         Initial Phase II trial completed
                                                   Other Phase II trials underway

               Scleroderma                         Initial Phase II trial 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                       Initial Phase I trial completed
  CC 4047      Blood cancers                       Initial Phase I 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.


                                       22

<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-
and are anti-angiogenic.

TNF-,  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- 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- 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 control and reduction
of TNF-  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- proteins,  including anti-TNF-  antibodies and TNF- 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-  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-  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- 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 has 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

                                       23
<PAGE>
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- 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- 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

                                       24
<PAGE>

and 10% of the patients  had a complete or nearly  complete  remission  based on
decreases in  paraprotein,  the myeloma protein 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-,
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.


                                       25
<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.


                                       26

<PAGE>
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  supplier
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-
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-.  Studies have  determined that many of the SelCIDs  decrease  synthesis of
TNF- 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- 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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<PAGE>


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


                                       28

<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-. 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-,  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 Rockefeller  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.  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 oncologic 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.

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<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 owned or  licensed  pending  applications  will result in the
issuance of patents or, if any patents  are issued,  whether  they will  provide
significant proprietary protection or commercial advantage, or whether they will
be  circumvented or infringed upon 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, or our licensors, were
the  first  to  make  the  inventions  covered  by each  of the  pending  patent
applications  or that  we,  or our  licensors,  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, or our licensors, 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 owned or licensed 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


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<PAGE>



will   require   regulatory   approval  by   governmental   agencies   prior  to
commercialization.  In  particular,  human  therapeutic  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 natural course of
disease in untreated  patients.  In some cases,  as a condition of NDA approval,
confirmatory  trials are required to be conducted after the FDA's approval of an
NDA in order to resolve any open  issues.  The FDA  requires  monitoring  of all
aspects of clinical trials and reports of all adverse events must be made to the
agency, both before and after drug approval.

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 employ 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.  Celgene also has received  orphan drug  designations  for
thalidomide:  for the  treatment  of  multiple  myeloma;  for the  treatment  of
HIV-associated   wasting   syndrome;   for  the   treatment   of  the   clinical
manifestations of mycobacterial  infection caused by Mycobacterium  tuberculosis
and non-tuberculosis mycobacteria; for the treatment of severe recurrent apthous
stomatitis in severely,  terminally  compromised patients; and for the treatment
of Crohn's disease. 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.


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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 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.  If a manufacturing  facility is not in substantial  compliance with
these requirements,  regulatory enforcement action may be taken by the FDA which
may include seeking an injunction against shipment of products from the facility
and recall of products previously shipped from the facility.

Failure to comply with  applicable  FDA  regulatory  requirements  can result in
informal administrative  enforcement actions such as warning letters, recalls or
adverse  publicity  issued  by the FDA or in  legal  actions  such as  seizures,
injunctions,  fines based on the equitable remedy of  disgorgement,  restitution
and criminal prosecution.

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-  production  through various
combinations  of  monoclonal  antibodies,  TNF-  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- 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-  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- 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.


                                       32

<PAGE>



EMPLOYEES


As of January 15, 2000, we had 146 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.


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.




                                       33

<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>
*    Executive Officer


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.


                                       34

<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,  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


                                       35
<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.





                                       36

<PAGE>



                              SELLING STOCKHOLDERS

The table below sets forth the  beneficial  ownership  of our common stock as of
December 31, 1999 by each of the selling  stockholders.  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 or convertible  within 60
days. Each of the selling stockholders 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  each  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%         258,000        158,700      *
  c/o John Hancock Life Insurance Company
  200 Clarendon Street
  Boston, MA 02117
  Attention: Sandeep Alva
        Bond & Corporate Finance Group, T-57

 Signature 1A (Cayman), Ltd. ........................    27,780         *           17,200         10,580      *
  c/o John Hancock Life Insurance Company
  200 Clarendon Street
  Boston, MA 02117
  Attention: Manager
        Investment Accounting Division, B-3

 John Hancock Variable Life Insurance Company .......    11,112         *            6,880          4,232      *
  c/o John Hancock Life Insurance Company
  200 Clarendon Street
  Boston, MA 02117
  Attention: Manager
        Investment Accounting Division, B-3

 John Hancock Life Insurance Company ................   377,808       2.0%         233,920        143,888      *
  200 Clarendon Street
  Boston, MA 02117
  Attention: Manager
        Investment Accounting Division, B-3
</TABLE>


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


                                       37

<PAGE>



                          DESCRIPTION OF CAPITAL STOCK


As of December 31, 1999,  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.


                                       38

<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.



                                       39

<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 2,327,267 shares of
common  stock,  of which 967,234 were  currently  exercisable,  and  outstanding
warrants  exercisable  for  551,044  shares  of  common  stock.  If  all  of the
convertible  notes  outstanding  on December 31, 1999 had been converted on that
date, 2,418,313 shares of common stock would have been issued. Immediately prior
to this offering,  the selling  stockholders  will convert a portion of our 9.0%
convertible notes issued in January 1999 held by them into 516,000 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  stockholders  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 and
director stock option plans existing on the date of this prospectus, without the
prior written consent of J.P. Morgan Securities Inc.



                                       40

<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 stockholders and the
underwriters,  to purchase from us and the selling stockholders,  and we and the
selling  stockholders  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 ..................................     3,000,000
                                                 =========
</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 and  the  selling
stockholders 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 450,000  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  stockholders,  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>

                                       41
<PAGE>



<TABLE>
<CAPTION>
                      ------------------------------
                              PAYABLE BY THE
                           SELLING STOCKHOLDERS
                      ------------------------------
                        NO EXERCISE    FULL EXERCISE
                      -------------   --------------
<S>                   <C>             <C>
Per share .........       $                $
  Total ...........       $                $
</TABLE>

We and the  selling  stockholders  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 $ .  The  selling  stockholders  will  pay no
expenses of this offering.

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.

One or more of the  underwriters  may  facilitate the marketing of this offering
online  directly or through one of its affiliates.  In those cases,  prospective
investors may view offering  terms and a prospectus  online and,  depending upon
the  particular  underwriter,  place orders  online or through  their  financial
advisors.


We and our executive  officers and directors and the selling  stockholders  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 and
director 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.


                                       42

<PAGE>



                                  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  industries are 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.

                       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;

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

o    Our Current Report on Form 8-K dated February 11, 1999;

o    Our Current Report on Form 8-K dated January 27, 2000;

o    Our Current Report on Form 8-K dated February 9, 2000; and

o    Our Current Report on Form 8-K dated February 9, 2000.

                                       43

<PAGE>



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

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

This prospectus is part of a registration statement we filed with the 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.






                                       44

<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 ........................... F-20

Condensed Consolidated Statements of Operations -- Nine Months Ended
 September 30, 1999 and 1998 ............................................................ F-21

Condensed Consolidated Statements of Operations -- Three Months Ended
 September 30, 1999 and 1998 ............................................................ F-22

Consolidated Statements of Cash Flows -- Nine Months Ended
 September 30, 1999 and 1998 ............................................................ F-23

Notes to Unaudited Condensed Consolidated Financial Statements .......................... F-24
</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 obligation ......................................................           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)

<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)
<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    $  (1,133)     $  (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-"),  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-. 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-  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>
                                                   -----------------------------------------
                                                          1996           1997          1998
In  thousands  of dollars,  except per share data  -----------   ------------  ------------
<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>

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

<TABLE>
<CAPTION>
                            ----------------------------------------------------------------------
                               OPTIONS OUTSTANDING                         OPTIONS EXERCISABLE
                            --------------------------                 ---------------------------
                                                            WEIGHTED
                                              WEIGHTED       AVERAGE                      WEIGHTED
                                 NUMBER        AVERAGE     REMAINING          NUMBER       AVERAGE
                            OUTSTANDING       EXERCISE          TERM     EXERCISABLE      EXERCISE
                            AT 12/31/98          PRICE        (YRS.)     AT 12/31/98         PRICE
RANGE OF EXERCISE 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  Officer,  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.


                                      F-16

<PAGE>



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

(8)  STOCK BASED COMPENSATION (CONTINUED)

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.

(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.


                                      F-17

<PAGE>



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

(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.

(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.


                                      F-18

<PAGE>



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

(12) COMMITMENTS AND CONTINGENCIES (CONTINUED)

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.

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-19

<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 condensed consolidated financial statements.


                                      F-20

<PAGE>



                              CELGENE CORPORATION
                CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
                                   (UNAUDITED)

<TABLE>
<CAPTION>
                                                                            ------------------------------------
                                                                                     NINE MONTHS ENDED
                                                                                       SEPTEMBER 30,
                                                                            ------------------------------------
                                                                                      1998                1999
                                                                            --------------     ---------------
<S>                                                                         <C>                <C>
Revenues:
 Product sales ..........................................................    $   1,030,838       $  15,063,644
 Research contracts .....................................................          105,000           1,732,500
                                                                             -------------       -------------
   Total revenues .......................................................        1,135,838          16,796,144
Expenses:
 Cost of goods sold .....................................................           59,270           2,076,457
 Research and development ...............................................       13,968,657          14,366,132
 Selling, general and administrative ....................................       11,207,326          17,846,527
                                                                             -------------       -------------
   Total expenses .......................................................       25,235,253          34,289,116
Operating loss ..........................................................      (24,099,415)        (17,492,972)
Other income and expense:
 Interest income ........................................................          497,100             511,659
 Interest expense .......................................................           45,192           1,954,420
                                                                             -------------       -------------
Loss from continuing operations .........................................      (23,647,507)        (18,935,733)
Discontinued operations: (Note 7)
 Loss from operations ...................................................          (59,837)                 --
 Gain on sale of chiral assets ..........................................        7,014,830                  --
                                                                             -------------       -------------
Net loss ................................................................      (16,692,514)        (18,935,733)
Accretion of premium payable on preferred stock .........................           24,648                  --
                                                                             -------------       -------------
Net loss applicable to common stockholders ..............................    $ (16,717,162)      $ (18,935,733)
                                                                             =============       =============
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 per share of common stock ...    $       (1.04)      $       (1.12)
                                                                             =============       =============
 Weighted average number of shares of common stock outstanding ..........       16,062,000          16,903,000
                                                                             =============       =============
</TABLE>

See accompanying notes to condensed consolidated financial statements.


                                      F-21

<PAGE>



                              CELGENE CORPORATION
                CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
                                   (UNAUDITED)

<TABLE>
<CAPTION>
                                                                          ---------------------------------
                                                                                 THREE MONTHS ENDED
                                                                                    SEPTEMBER 30,
                                                                          ---------------------------------
                                                                                     1998              1999
                                                                          ---------------   ---------------
<S>                                                                       <C>               <C>
Revenues:
 Product sales ........................................................    $  1,030,838      $  6,315,319
 Research contracts ...................................................          25,000           425,000
                                                                           ------------      ------------
   Total revenues .....................................................       1,055,838         6,740,319
Expenses:
 Cost of goods sold ...................................................          59,270           701,816
 Research and development .............................................       5,238,106         4,933,317
 Selling, general and administrative ..................................       3,876,150         6,618,373
                                                                           ------------      ------------
   Total expenses .....................................................       9,173,526        12,253,506

Operating loss ........................................................      (8,117,688)       (5,513,187)
Other income and expense:
 Interest income ......................................................         136,262           256,215
 Interest expense .....................................................          39,086           861,397
                                                                           ------------      ------------
Net loss ..............................................................    $ (8,020,512)     $ (6,118,369)
                                                                           ============      ============
Per share basic and diluted:
 Net loss .............................................................    $      (0.49)     $      (0.36)
                                                                           ============      ============
Weighted average number of shares of common stock outstanding .........      16,399,000        17,028,000
                                                                           ============      ============
</TABLE>

See accompanying notes to condensed consolidated financial statements.


                                      F-22

<PAGE>



                               CELGENE CORPORATION
                      CONSOLIDATED STATEMENTS OF CASH FLOWS
                                   (UNAUDITED)

<TABLE>
<CAPTION>
                                                                                        -------------------------------------
                                                                                           NINE MONTHS ENDED SEPTEMBER 30,
                                                                                        -------------------------------------
                                                                                                     1998                1999
                                                                                        -----------------   -----------------
<S>                                                                                     <C>                 <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
Loss from continuing operations .....................................................     $ (23,647,507)      $ (18,935,733)
Adjustments to reconcile loss from continuing operations to
 net cash used in operating activities:
 Depreciation .......................................................................           575,575             585,497
 Issuance of stock for employee benefits ............................................           463,606             799,004
 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 ..............................................................          (317,437)           (500,864)
 Increase (Decrease) in accounts payable and accrued expenses .......................        (1,984,036)           (822,440)
 (Increase) Decrease in accounts receivable .........................................           388,063            (353,292)
 (Increase) Decrease in other assets ................................................           129,648            (496,534)
                                                                                          -------------       -------------
Net cash used in continuing operations ..............................................       (20,424,016)        (19,353,359)
Net cash used in discontinued operations ............................................           (59,837)                 --
                                                                                          -------------       -------------
Net cash used in operating activities ...............................................       (20,483,853)        (19,353,359)
                                                                                          -------------       -------------
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures ................................................................          (645,104)           (406,579)
Proceeds from sales and maturities of marketable
 securities available for sale ......................................................         7,086,154           2,495,992
Purchases of marketable securities available for sale ...............................       (10,116,494)         (4,802,578)
Proceeds from sale of chiral assets .................................................         7,500,000                  --
                                                                                          -------------       -------------
Net cash provided by (used in) investing activities .................................         3,824,556          (2,713,165)
                                                                                          -------------       -------------
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 .........................         1,673,740           4,235,869
Capital lease buyout ................................................................          (329,614)           (161,799)
Capital lease funding ...............................................................           260,195                  --
Debt issuance costs .................................................................          (437,500)           (750,000)
Proceeds from convertible notes .....................................................         8,750,000          30,000,000
                                                                                          -------------       -------------
Net cash provided by (used in) financing activities .................................        12,343,685          33,324,070
                                                                                          -------------       -------------
Net (decrease) increase in cash and cash equivalents ................................        (4,315,612)         11,257,546
Cash and cash equivalents at beginning of period ....................................        13,583,445           3,066,953
                                                                                          -------------       -------------
Cash and cash equivalents at end of period ..........................................     $   9,267,833       $  14,324,499
                                                                                          -------------       -------------
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 .......................................................................     $      11,468       $   1,080,693
                                                                                          =============       =============
</TABLE>

See accompanying notes to condensed consolidated financial statements.


                                      F-23

<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-24

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

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


                                      F-25

<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 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.

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-26

<PAGE>







                       [CELGENE CORPORATION LOGO 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 .......................    $ 63,344
         NASDAQ National Market listing fee .........      24,233
         NASD filing fee ............................      19,185
         Legal fees and expenses ....................     150,000
         Accounting fees and expenses ...............      75,000
         Printing fees ..............................     160,000
            Total ...................................    $491,762
                                                         ========
</TABLE>


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>
 1.1 --      Form of Underwriting Agreement.
 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>



*    Previously filed.


                                      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


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 February 9, 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             February 9, 2000
- --------------------------      Officer (Principal Executive Officer)
       John W. Jackson

              *                 President, Chief Operating Officer and Director       February 9, 2000
- --------------------------
         Sol J. Barer

              *                 Chief Financial Officer (Principal Accounting and     February 9, 2000
- --------------------------      Financial Officer)
       Robert J. Hugin

              *                 Director                                              February 9, 2000
- --------------------------
        Jack L. Bowman

              *                 Director                                              February 9, 2000
- --------------------------
        Frank T. Cary

                                Director                                              February 9, 2000
- --------------------------
         Gilla Kaplan

                                Director                                              February 9, 2000
- --------------------------
     Arthur Hull Hayes, Jr.

                                Director                                              February 9, 2000
- --------------------------
      Richard C. E. Morgan

              *                 Director                                              February 9, 2000
- --------------------------
        Walter L. Robb

              *                 Director                                              February 9, 2000
- --------------------------
       Lee J. Schroeder
</TABLE>


*    Executed by attorney-in-fact.



                                      II-3

<PAGE>



                                INDEX TO EXHIBITS


<TABLE>

<S>       <C>
 1.1 --   Form of Underwriting Agreement.
 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>



*    Previously filed.







                               CELGENE CORPORATION

                        3,000,000 Shares of Common Stock

                             Underwriting Agreement


                                                              February [ ], 2000


J.P. Morgan Securities Inc.
Prudential Securities Incorporated
U.S. Bancorp Piper Jaffray Inc.
  As Representatives of the several Underwriters
  listed in Schedule I hereto
c/o J.P. Morgan Securities Inc.
60 Wall Street
New York, New York  10260

Ladies and Gentlemen:

     Celgene Corporation,  a Delaware  corporation (the "Company"),  proposes to
issue and sell  2,484,000  shares (the "Company  Shares") of Common  Stock,  par
value $.01 per share (the "Common Stock"), of the Company, and Hancock Mezzanine
Partners  L.P.,  a  partnership  formed under the laws of the State of Delaware,
John Hancock Life Insurance Company, a Massachusetts  corporation,  John Hancock
Variable Life Insurance Company, a Massachusetts  corporation,  and Signature 1A
(Cayman),  Ltd., a corporation  organized  under the laws of the Cayman  Islands
(each  individually  referred  to as a "Selling  Stockholder"  and  collectively
referred  to as the  "Selling  Stockholders")  propose to sell an  aggregate  of
516,000 shares (the "Selling Stockholder Shares") of Common Stock of the Company
to the several  Underwriters  listed in Schedule I hereto (the  "Underwriters"),
for whom you are acting as representatives (the "Representatives").  The Company
Shares  and  the  Selling  Stockholder  Shares  are  herein  referred  to as the
"Underwritten   Shares."  In   addition,   for  the  sole  purpose  of  covering
over-allotments  in connection  with the sale of the  Underwritten  Shares,  the
Company  proposes  to issue and sell to the  Underwriters,  at the option of the
Underwriters, up to an additional 450,000 shares (the "Option Shares") of Common
Stock. The  Underwritten  Shares and the Option Shares are herein referred to as
the "Shares."


<PAGE>


                                       2


     The  Company  has  prepared  and filed  with the  Securities  and  Exchange
Commission  (the   "Commission")  in  accordance  with  the  provisions  of  the
Securities  Act of 1933,  as  amended,  and the  rules  and  regulations  of the
Commission  thereunder  (collectively,  the  "Securities  Act"),  a registration
statement  on Form S-3,  including a  prospectus,  relating  to the Shares.  The
registration  statement  as amended  at the time when it became or shall  become
effective,  including information (if any) deemed to be part of the registration
statement  at the  time  of  effectiveness  pursuant  to  Rule  430A  under  the
Securities  Act,  is  referred  to  in  this  Agreement  as  the   "Registration
Statement," and the prospectus in the form first used to confirm sales of Shares
is referred to in this Agreement as the  "Prospectus."  If the Company has filed
an  abbreviated  registration  statement  pursuant  to  Rule  462(b)  under  the
Securities Act ("Rule 462 Registration Statement"), then any reference herein to
the term  "Registration  Statement"  shall be  deemed to  include  such Rule 462
Registration  Statement.  Any  reference in this  Agreement to the  Registration
Statement, any preliminary prospectus or the Prospectus shall be deemed to refer
to and include the documents  incorporated by reference therein pursuant to Item
12 of Form  S-3  under  the  Securities  Act,  as of the  effective  date of the
Registration  Statement  or the  date  of  such  preliminary  prospectus  or the
Prospectus,  as the case may be, and any  reference to "amend,"  "amendment"  or
"supplement"  with  respect  to  the  Registration  Statement,  any  preliminary
prospectus  or the  Prospectus  shall be  deemed  to refer  to and  include  any
documents  filed after such date under the  Securities  Exchange Act of 1934, as
amended,   and  the  rules  and   regulations  of  the   Commission   thereunder
(collectively,  the  "Exchange  Act")  that are  deemed  to be  incorporated  by
reference therein.

     The  Company and each of the Selling  Stockholders  hereby  agrees with the
Underwriters as follows:

     1. The Company  agrees to issue and sell the Company Shares and each of the
Selling  Stockholders  agrees,  severally  and not jointly,  to sell the Selling
Stockholder Shares to the several Underwriters as hereinafter provided, and each
Underwriter,  upon  the  basis  of the  representations  and  warranties  herein
contained, but subject to the conditions hereinafter stated, agrees to purchase,
severally  and not  jointly,  from each of the  Company  and each of the Selling
Stockholders  at a purchase price per share of $[ ] (the  "Purchase  Price") the
number  of  Underwritten  Shares  (to be  adjusted  by  you  so as to  eliminate
fractional   shares)   determined  by  multiplying   the  aggregate   number  of
Underwritten  Shares  to be sold  by the  Company  and by  each  of the  Selling
Stockholders  as set forth  opposite  their  respective  names under the heading
"Number  of  Underwritten  Shares"  in  Schedule  II hereto by a  fraction,  the
numerator  of  which  is the  aggregate  number  of  Underwritten  Shares  to be
purchased by such Underwriter as set forth opposite the name of such Underwriter
in Schedule I hereto and the  denominator  of which is the  aggregate  number of
Underwritten Shares to be purchased by all the Underwriters from the Company and
all the Selling Stockholders hereunder.


<PAGE>


                                       3


     In addition,  the Company agrees to issue and sell the Option Shares to the
several  Underwriters as hereinafter  provided,  and the Underwriters,  upon the
basis of the representations and warranties herein contained, but subject to the
conditions hereinafter stated, shall have the option to purchase,  severally and
not jointly,  from the Company at the Purchase  Price that portion of the number
of Option  Shares as to which such  election  shall have been  exercised  (to be
adjusted by you so as to eliminate  fractional shares) determined by multiplying
such  number  of Option  Shares by a  fraction,  the  numerator  of which is the
maximum  number of  Underwritten  Shares which such  Underwriter  is entitled to
purchase as set forth opposite the name of such Underwriter in Schedule I hereto
and the denominator of which is the maximum number of Option Shares which all of
the  Underwriters  are entitled to purchase  hereunder,  for the sole purpose of
covering  over-allotments  (if any) in the sale of  Underwritten  Shares  by the
several Underwriters.

     The  Underwriters  may exercise the option to purchase the Option Shares at
any time (but not more than once) on or before the  thirtieth  day following the
date of this  Agreement,  by  written  notice  from the  Representatives  to the
Company. Such notice shall set forth the aggregate number of Option Shares as to
which the option is being exercised and the date and time when the Option Shares
are to be  delivered  and paid  for,  which may be the same date and time as the
Closing Date (as hereinafter  defined) but shall not be earlier than the Closing
Date nor later than the tenth full Business Day (as  hereinafter  defined) after
the date of such notice  (unless such time and date are  postponed in accordance
with the  provisions  of Section 9 hereof).  Any such  notice  shall be given at
least  two  Business  Days  prior to the date  and  time of  delivery  specified
therein.

     2.  The  Company  and  the  Selling   Stockholders   understand   that  the
Underwriters  intend (i) to make a public  offering  of the Shares as soon after
(A) the  Registration  Statement has become effective and (B) the parties hereto
have  executed  and  delivered   this  Agreement  as  in  the  judgment  of  the
Representatives  is  advisable  and (ii)  initially to offer the Shares upon the
terms set forth in the Prospectus.

     3.  Payment for the Shares  shall be made by wire  transfer in  immediately
available  funds to the accounts  specified  by the Company,  in the case of the
Company Shares,  and to the accounts specified by the Selling  Stockholders,  in
the case of the Selling  Stockholder  Shares, to the Representatives on February
[ ],  2000, or at such other time on the same or such other date, not later than
the fifth Business Day thereafter,  as the Representatives,  the Company and the
Selling  Stockholders may agree upon in writing,  or to an account  specified to
the  Representatives  by the Company,  in the case of the Option Shares,  on the
date and time  specified  by the  Representatives  in the written  notice of the
Underwriters' election to purchase such Option Shares. The time and date of such
payment for the Underwritten Shares is referred to herein as the "Closing Date,"
and the time and date for such payment for the Option Shares,  if other than the
Closing Date, are herein referred to as the "Additional Closing Date."


<PAGE>


                                       4


As used herein,  the term "Business Day" means any day other than a day on which
banks are permitted or required to be closed in New York City.

     Payment  for  the  Shares  to be  purchased  on  the  Closing  Date  or the
Additional  Closing Date, as the case may be, shall be made against  delivery to
the Representatives  for the respective accounts of the several  Underwriters of
the Shares to be  purchased  on such date  registered  in such names and in such
denominations as the Representatives shall request in writing not later than two
full Business Days prior to the Closing Date or the Additional  Closing Date, as
the case may be, with any transfer taxes payable in connection with the transfer
to the Underwriters of the Company Shares and the Option Shares duly paid by the
Company and any transfer  taxes payable in  connection  with the transfer to the
Underwriters  of the  Selling  Stockholder  Shares  duly  paid  by  the  Selling
Stockholders.  The  certificates  for the  Shares  will be  made  available  for
inspection  and packaging by the  Representatives  at the office of J.P.  Morgan
Securities Inc. set forth above not later than 1:00 P.M., New York City time, on
the Business Day prior to the Closing Date or the  Additional  Closing  Date, as
the case may be.

     4. (A) The Company  represents  and  warrants to the  Underwriters  and the
Selling Stockholders that:

          (a) no  order  preventing  or  suspending  the use of any  preliminary
     prospectus  has  been  issued  by  the  Commission,  and  each  preliminary
     prospectus filed as part of the Registration  Statement as originally filed
     or as part of any amendment  thereto,  or filed  pursuant to Rule 424 under
     the Securities  Act,  complied when so filed in all material  respects with
     the Securities  Act, and did not contain an untrue  statement of a material
     fact or omit to state a  material  fact  required  to be stated  therein or
     necessary to make the  statements  therein,  in light of the  circumstances
     under  which  they  were  made,  not   misleading;   provided,   that  this
     representation  and  warranty  shall  not  apply to any  statements  in, or
     omissions  from,  the  Registration  Statement  or the  Prospectus  made in
     reliance  upon  and  in  conformity  with   information   relating  to  any
     Underwriter furnished to the Company in writing by such Underwriter through
     the Representatives expressly for use therein;

          (b) no stop order  suspending the  effectiveness  of the  Registration
     Statement  has been  issued and no  proceeding  for that  purpose  has been
     instituted  or,  to  the  knowledge  of  the  Company,  threatened  by  the
     Commission,  and the  Registration  Statement and Prospectus (as amended or
     supplemented  if  the  Company  shall  have  furnished  any  amendments  or
     supplements  thereto)  comply,  or will comply,  as the case may be, in all
     material  respects with the  Securities  Act and do not and will not, as of
     the  applicable  effective  date as to the  Registration  Statement and any
     amendment thereto and as of the date of the Prospectus and any amendment or
     supplement thereto,


<PAGE>


                                       5

     contain  any  untrue  statement of  a material fact or omit  to  state  any
     material  fact  required  to be  stated  therein   or  necessary  to   make
     the statements therein not misleading, and the Prospectus,  as  amended  or
     supplemented, if applicable, at  the  Closing  Date  or  Additional Closing
     Date, as the case may be, will  not  contain  any  untrue  statement  of  a
     material  fact or  omit  to state a material  fact  necessary  to make  the
     statements therein, in light of  the circumstances  under   which they were
     made, not  misleading;  provided, that  the foregoing  representations  and
     warranties  shall not apply to any  statements   in,  or   omissions  from,
     the Registration Statement or the Prospectus  made  in  reliance  upon  and
     in conformity  with  information relating to any Underwriter  furnished  to
     the Company in  writing  by such  Underwriter  through  the Representatives
     expressly for use therein;

          (c) the documents  incorporated by reference in the  Prospectus,  when
     they became  effective or were filed with the  Commission,  as the case may
     be,  conformed  in  all  material  respects  to  the  requirements  of  the
     Securities  Act or the  Exchange  Act,  as  applicable,  and  none  of such
     documents  contained an untrue  statement of a material  fact or omitted to
     state a material fact necessary to make the statements therein, in light of
     the circumstances  under which they were made, not misleading;  any further
     documents so filed and  incorporated by reference in the  Prospectus,  when
     such documents are filed with the Commission,  will conform in all material
     respects to the  requirements  of the Exchange Act, and will not contain an
     untrue  statement  of a  material  fact or omit to  state a  material  fact
     necessary to make the  statements  therein,  in light of the  circumstances
     under which they were made, not misleading;

          (d) the financial statements,  and the related notes thereto, included
     or  incorporated  by  reference  in  the  Registration  Statement  and  the
     Prospectus  present  fairly  the  consolidated  financial  position  of the
     Company  as of the dates  indicated  and the  consolidated  results  of its
     operations  and  changes  in cash  flows for the  periods  specified;  such
     financial  statements  have been prepared in conformity  with United States
     generally accepted accounting principles applied on a consistent basis, and
     the  supporting  schedules  included or  incorporated  by  reference in the
     Registration Statement present fairly the information required to be stated
     therein;

          (e) since the respective dates as of which information is given in the
     Registration Statement and the Prospectus, there has not been any change in
     the capital stock or long-term  debt of the Company or its  subsidiary,  or
     any material  adverse change,  or any  development  involving a prospective
     material  adverse change,  in or affecting the general  affairs,  business,
     prospects,  management, financial position, stockholders' equity or results
     of  operations  of the  Company  and its  subsidiary,  taken  as a whole (a
     "Material Adverse Change"),  otherwise than as set forth or contemplated in
     the Prospectus;  and except as set forth or contemplated in the Prospectus,
     neither the Co-


<PAGE>


                                       6

     mpany  nor  its  subsidiary  has entered into any  transaction or agreement
     (whether or not in   the  ordinary  course  of  business)  material  to the
     Company  and its subsidiary, taken as a whole;

          (f) the Company has been duly  incorporated and is validly existing as
     a  corporation  in good  standing  under the laws of the State of Delaware,
     with  corporate  power and authority to own its  properties and conduct its
     business as described in the  Prospectus,  and has been duly qualified as a
     foreign corporation for the transaction of business and is in good standing
     under  the laws of each  other  jurisdiction  in  which  it owns or  leases
     properties,  or conducts any business, so as to require such qualification,
     other than where the failure to be so qualified or in good  standing  would
     not have a  material  adverse  effect  on the  general  affairs,  business,
     prospects,  management, financial position, stockholders' equity or results
     of  operations  of the  Company  and its  subsidiary,  taken  as a whole (a
     "Material Adverse Effect");

          (g) the Company  has no  subsidiaries  other than  Celgro  Corporation
     ("Celgro");  the Company's  subsidiary  has been duly  incorporated  and is
     validly  existing as a corporation  in good standing  under the laws of the
     state of Delaware with corporate  power and authority to own its properties
     and conduct its business as described in the Prospectus,  and has been duly
     qualified as a foreign  corporation  for the transaction of business and is
     in good standing  under the laws of each  jurisdiction  in which it owns or
     leases  properties,  or  conducts  any  business,  so  as to  require  such
     qualification,  other than where the failure to be so  qualified or in good
     standing would not have a Material Adverse Effect;  and all the outstanding
     shares  of  capital  stock  of the  Company's  subsidiary  have  been  duly
     authorized and validly issued, are fully-paid and  non-assessable,  and are
     owned by the Company, directly or indirectly,  free and clear of all liens,
     encumbrances, security interests and claims;

          (h) this Agreement has been duly authorized, executed and delivered by
     the Company;

          (i) the Company has an authorized  capitalization  as set forth in the
     Prospectus and such  authorized  capital stock conforms to the  description
     thereof set forth in the Prospectus,  and all of the outstanding  shares of
     capital stock of the Company have been duly  authorized and validly issued,
     are fully paid and non-assessable and are not subject to any pre-emptive or
     similar rights;  and,  except as described in or expressly  contemplated by
     the  Prospectus,  there  are  no  outstanding  rights  (including,  without
     limitation,  pre-emptive  rights),  warrants  or  options  to  acquire,  or
     instruments  convertible  into or  exchangeable  for, any shares of capital
     stock or other  equity  interest in the  Company,  its  subsidiary,  or any
     contract, commitment,  agreement,  understanding or arrangement of any kind
     relating  to the  issuance  of  any  capital  stock  of  the  Company,



<PAGE>


                                       7


     its subsidiary, any such convertible or exchangeable securities or any such
     rights, warrants or options;

          (j) the Shares to be issued  and sold by the  Company  hereunder  have
     been duly authorized, and, when issued and delivered to and paid for by the
     Underwriters  in  accordance  with  the  terms of this  Agreement,  will be
     validly issued and will be fully paid and  non-assessable  and will conform
     to the description thereof set forth in the Prospectus; and the issuance of
     such Shares is not subject to any preemptive or similar rights;

          (k)  the  Shares  to be  sold by the  Selling  Stockholders  hereunder
     issuable upon the  conversion of a portion of the 9.00%  Convertible  Notes
     due January 20, 2004 (each a "Note" and  collectively,  the "Notes") by the
     Selling Stockholders have been duly and validly authorized and reserved for
     issuance,  and at the time of delivery to the Underwriters  with respect to
     such  Shares  (assuming  prior  delivery  of the Notes to the  Company  for
     conversion),  such Shares will be issued and delivered in  accordance  with
     the provisions of the Note between the Company and such Selling Stockholder
     and will be validly  issued and will be fully paid and  non-assessable  and
     will conform to the description thereof set forth in the Prospectus;

          (l) the  Notes  were  duly  authorized,  executed  and  delivered  and
     constitute  valid and binding  instruments  enforceable in accordance  with
     their  terms,  subject,  as  to  enforcement,  to  bankruptcy,  insolvency,
     reorganization  and other  laws of  general  applicability  relating  to or
     affecting  creditors'  rights and to general equity  principles;  and Notes
     conform to the description thereof set forth in the Prospectus;

          (m) neither the Company nor its  subsidiary  is, or with the giving of
     notice or lapse of time or both would be, in breach or  violation  of or in
     default under its certificate of incorporation or by-laws or any indenture,
     mortgage, deed of trust, loan agreement or other agreement or instrument to
     which  any of the  Company  or its  subsidiary  is a party or by which  the
     Company  or its  subsidiary  is bound or to which  any of their  respective
     properties or assets is subject,  except for  violations and defaults which
     individually and in the aggregate would not have a Material Adverse Effect;
     the  issuance  and sale of the Shares to be sold by the Company  hereunder,
     the issuance by the Company of the Shares to be issued upon  conversion  of
     the  Notes  and  sold  by  the  Selling  Stockholders   hereunder  and  the
     performance by the Company of its obligations  under this Agreement and the
     consummation of the transactions contemplated herein will not conflict with
     or result in a breach or violation of any of the terms or provisions of, or
     constitute a default under, any indenture,  mortgage,  deed of trust,  loan
     agreement  or other  agreement  or  instrument  to which the Company or its
     subsidiary is a party or by which the Company or its subsidiary is bound or
     to which any of their respective


<PAGE>


                                       8

     properties  or assets is subject,  nor will any such  action  result in any
     violation of the  provisions of the  certificate  of  incorporation  or the
     by-laws of the Company or any applicable law or statute or any order,  rule
     or  regulation  of  any  court  or  governmental   agency  or  body  having
     jurisdiction  over the Company,  its subsidiary or any of their  respective
     properties;   no  consent,   approval,   authorization,   order,   license,
     registration  or  qualification  of or with any such court or  governmental
     agency or body is  required  for the  consummation  by the  Company  of the
     transactions   contemplated  by  this  Agreement,   except  such  consents,
     approvals,    authorizations,    orders,    licenses,    registrations   or
     qualifications as have been obtained under the Securities Act and as may be
     required  under state  securities or blue sky laws in  connection  with the
     purchase and distribution of the Shares by the Underwriters;

          (n) other than as set forth in the  Prospectus,  there are no legal or
     governmental  investigations,  actions, suits or proceedings pending or, to
     the knowledge of the Company,  threatened  against or affecting the Company
     or its  subsidiary  or any of their  respective  properties or to which the
     Company or its  subsidiary is or may be a party or to which any property of
     the Company or its  subsidiary  is or may be subject  which,  if determined
     adversely to the Company or its  subsidiary,  could  individually or in the
     aggregate  have,  or  reasonably  be expected to have,  a Material  Adverse
     Effect;  and, to the  knowledge of the  Company,  no such  proceedings  are
     threatened or contemplated by any governmental authorities or threatened by
     others;  and  there  are  no  statutes,  regulations,  contracts  or  other
     documents that are required to be described in the  Registration  Statement
     or Prospectus or to be filed as exhibits to the Registration Statement that
     are not described or filed as required;

          (o) the Company and its subsidiary  have good and marketable  title to
     all  personal  property  owned  by  them,  free  and  clear  of all  liens,
     encumbrances and defects except such as are described or referred to in the
     Prospectus or such as do not  materially  affect the value of such property
     and do not  interfere  with  the use  made or  proposed  to be made of such
     property by the  Company  and its  subsidiary;  and any real  property  and
     buildings  held under lease by the Company and its  subsidiary  are held by
     them under valid,  existing and enforceable  leases with such exceptions as
     are not material and do not  interfere  with the use made or proposed to be
     made of such property and buildings by the Company or its subsidiary;

          (p) no relationship,  direct or indirect,  exists between or among the
     Company or its  subsidiary,  on the one hand, and the directors,  officers,
     stockholders,  customers or suppliers of the Company or its subsidiary,  on
     the other hand,  which is required by the Securities Act to be described in
     the Registration Statement and the Prospectus which is not so described;


<PAGE>


                                       9


          (q) except for rights which have been waived or  exercised,  no person
     has the right to  require  the  Company  to  register  any  securities  for
     offering and sale under the  Securities  Act by reason of the filing of the
     Registration Statement with the Commission, or the issuance and sale of the
     Shares to be sold by the  Company  hereunder  or, to the  knowledge  of the
     Company,  the sale of the  Shares  to be sold by the  Selling  Stockholders
     hereunder;

          (r) the Company is not,  and after  giving  effect to the issuance and
     sale of the  Shares  will not be,  an  "investment  company"  or an  entity
     "controlled"  by an "investment  company," as such terms are defined in the
     Investment Company Act of 1940, as amended (the "Investment Company Act");

          (s)  KPMG  LLP  ("KPMG"),  who  have  certified  certain  consolidated
     financial  statements of the Company, are independent public accountants as
     required by the Securities Act;

          (t) the  Company and its  subsidiary  have filed all  federal,  state,
     local and foreign tax returns which have been required to be filed and have
     paid all taxes shown thereon and all assessments received by them or either
     of them to the extent  that such  taxes  have  become due and are not being
     contested  in  good  faith;  and  no tax  deficiency  has  been  determined
     adversely to the Company and there is no tax  deficiency  which has been or
     might  reasonably  be expected to be  asserted  or  threatened  against the
     Company or its subsidiary;

          (u)  the  Company  has  not  taken  nor  will  it  take,  directly  or
     indirectly,  any action  designed to, or that might be reasonably  expected
     to, cause or result in  stabilization  or  manipulation of the price of the
     Common Stock;

          (v)  the   statistical  and   market-related   data  included  in  the
     Registration  Statement  and the  Prospectus  are based on or derived  from
     sources which are believed by the Company to be reliable;

          (w) each of the  Company and its  subsidiary  owns,  possesses  or has
     obtained all licenses, permits,  certificates,  consents, orders, approvals
     and other  authorizations  from, and has made all  declarations and filings
     with, all federal, state, local and foreign governmental  authorities,  all
     self-regulatory  organizations and all courts and other tribunals, domestic
     or foreign,  necessary to own or lease,  as the case may be, and to operate
     its  properties  and to carry on its  business as  conducted as of the date
     hereof,  and neither the Company nor its subsidiary has received any notice
     of any  proceeding  relating  to  revocation  or  modification  of any such
     license,   permit,   certificate,   consent,   order,   approval  or  other
     authorization,  except as described in the  Registration  State-


<PAGE>


                                       10

     ment and the  Prospectus;  and each of the Company and its subsidiary is in
     compliance  with all laws and  regulations  relating  to the conduct of its
     business as conducted as of the date hereof;

          (x) each of the Company and its subsidiary owns, is licensed to use or
     otherwise  possesses  adequate  rights to use the patents,  patent  rights,
     licenses,  inventions,  trademarks,  service marks, trade names, copyrights
     and  know-how,   including  trade  secrets  and  other  unpatented   and/or
     unpatentable proprietary or confidential information, systems, processes or
     procedures   (collectively,   the  "Intellectual   Property"),   reasonably
     necessary  to carry on the business  conducted by it,  except to the extent
     that the failure to own, be licensed to use or otherwise  possess  adequate
     rights to use such  Intellectual  Property would not individually or in the
     aggregate be reasonably expected to have a Material Adverse Effect;  except
     as set forth in the Registration Statement and the Prospectus,  the Company
     has not received any notice of  infringement  of or conflict  with, and the
     Company has no knowledge of any infringement of or conflict with,  asserted
     rights of others with  respect to the  Intellectual  Property  which could,
     individually  or in the  aggregate,  reasonably  be expected to result in a
     Material Adverse Effect; except as set forth in the Registration  Statement
     and the Prospectus, the discoveries,  inventions,  products or processes of
     the Company referred to in the Registration Statement and the Prospectus do
     not, to the  knowledge  of the  Company,  infringe on or conflict  with any
     right or patent of any third party, or any discovery, invention, product or
     process  which is the  subject of a patent  application  filed by any third
     party (which patent application has been published or is otherwise known to
     the Company) which could,  individually or in the aggregate,  reasonably be
     expected to result in a Material Adverse Effect; except as set forth in the
     Registration Statement and the Prospectus,  the Company is not obligated to
     pay any royalty,  grant any license or provide other  consideration  to any
     third  party in  connection  with its  patents,  patent  rights,  licenses,
     inventions, trademarks, service marks, trade names, copyrights and know-how
     which could  reasonably be expected to result in a Material Adverse Effect;
     and no third party,  including any academic or  governmental  organization,
     possesses  rights to the Intellectual  Property which, if exercised,  could
     reasonably be expected to have a Material Adverse Effect;

          (y) since the respective dates as of which information is given in the
     Registration   Statement  and  the  Prospectus,   the  studies,  tests  and
     preclinical  and clinical  trials  conducted by or on behalf of the Company
     that are described in the  Registration  Statement and the Prospectus  were
     and, if still pending,  are being conducted in accordance with experimental
     protocols,  procedures and controls pursuant to, where applicable, accepted
     professional  scientific standards,  except where the failure to so conduct
     could not  reasonably be expected to result in a Material  Adverse  Effect;
     the des-

<PAGE>


                                       11

     criptions of the results of such studies, tests and trials contained in the
     Registration  Statement and the Prospectus are accurate and complete in all
     material  respects;  and  the  Company  has not  received  any  notices  or
     correspondence  from the U.S.  Food and Drug  Administration  or any state,
     local  or  foreign   governmental  body  exercising   comparable  authority
     requiring  the  termination,  suspension  or material  modification  of any
     studies,  tests or preclinical or clinical trials conducted by or on behalf
     of the Company which termination, suspension or material modification could
     reasonably be expected to have a Material Adverse Effect;

          (z)  there  are no  existing  or,  to the  knowledge  of the  Company,
     threatened  labor  disputes  with  the  employees  of  the  Company  or its
     subsidiary  which could  reasonably be expected to have a Material  Adverse
     Effect;

          (aa)  the  Company  and  its  subsidiary  carry,  or are  covered  by,
     insurance in such  amounts and  covering  such risks as is adequate for the
     conduct of their  respective  businesses and the value of their  respective
     properties and as is customary for companies engaged in similar  businesses
     in similar industries;

          (bb) the Company and its subsidiary (i) are in compliance with any and
     all  applicable  federal,  state,  local and foreign  laws and  regulations
     relating to the protection of human health and safety,  the  environment or
     hazardous  or  toxic  substances  or  wastes,  pollutants  or  contaminants
     (collectively,  "Environmental  Laws"),  (ii) have  received  all  permits,
     licenses or other approvals required of them under applicable Environmental
     Laws to conduct  their  respective  businesses  and (iii) are in compliance
     with all terms and  conditions  of any such  permit,  license or  approval,
     except where such noncompliance with Environmental Laws, failure to receive
     required permits, licenses or other approvals or failure to comply with the
     terms and  conditions  of such  permits,  licenses or  approvals  would not
     individually or in the aggregate have a Material Adverse Effect;

          (cc) in the ordinary  course of its business,  the Company  conducts a
     periodic  review  of the  effect  of  Environmental  Laws on the  business,
     operations and properties of the Company and its subsidiary,  in the course
     of which it  identifies  and  evaluates  associated  costs and  liabilities
     (including,  without  limitation,  any  capital or  operating  expenditures
     required  for  clean-up,   closure  of   properties   or  compliance   with
     Environmental  Laws  or  any  permit,  license  or  approval,  any  related
     constraints on operating activities and any potential  liabilities to third
     parties); on the basis of such review, the Company has reasonably concluded
     that such associated costs and liabilities would not individually or in the
     aggregate have a Material Adverse Effect;




<PAGE>


                                       12

     (dd) each employee benefit plan,  within the meaning of Section 3(3) of the
     Employee Retirement Income Security Act of 1974, as amended ("ERISA"), that
     is maintained,  administered or contributed to by the Company or any of its
     affiliates  for  employees  or  former  employees  of the  Company  and its
     affiliates has been  maintained in material  compliance  with its terms and
     the requirements of any applicable statutes, orders, rules and regulations,
     including  but not limited to ERISA and the Internal  Revenue Code of 1986,
     as amended (the "Code"); no prohibited  transaction,  within the meaning of
     Section 406 of ERISA or Section 4975 of the Code, has occurred with respect
     to any such plan excluding transactions effected pursuant to a statutory or
     administrative  exemption;  for each  such  plan  which is  subject  to the
     funding  rules of  Section  412 of the Code or  Section  302 of  ERISA,  no
     "accumulated  funding  deficiency,"  as defined in Section 412 of the Code,
     has been incurred,  whether or not waived, and the fair market value of the
     assets of each such plan  (excluding for these purposes  accrued but unpaid
     contributions)  exceed the present value of all benefits accrued under such
     plan determined using reasonable actuarial assumptions;

          (ee) the Company has not  distributed  and,  prior to the later of (i)
     the Closing Date and (ii) the completion of the distribution of the Shares,
     will not distribute any offering  material in connection  with the offering
     and  sale  of  the  Shares  other  than  the  Registration  Statement,  the
     Prospectus, any amendment or supplement thereto, any preliminary prospectus
     or any other materials, if any, permitted by the Securities Act; and

          (ff) the  Company  and its  subsidiary  maintain a system of  internal
     accounting  controls  sufficient to provide  reasonable  assurance that (i)
     transactions  are  executed  in  accordance  with  management's  general or
     specific  authorizations;  (ii)  transactions  are recorded as necessary to
     permit preparation of financial statements in conformity with United States
     generally   accepted   accounting   principles   and  to   maintain   asset
     accountability; (iii) access to assets is permitted only in accordance with
     management's  general  or  specific  authorization;  and (iv) the  recorded
     accountability   for  assets  is  compared  with  the  existing  assets  at
     reasonable  intervals and  appropriate  action is taken with respect to any
     differences.

     (B) Each of the Selling  Stockholders  severally represents and warrants to
each of the Underwriters and the Company that:

          (a) such  Selling  Stockholder  has been duly  formed  and is  validly
     existing  as a  corporation  or  partnership,  as the case may be,  in good
     standing under its jurisdiction of incorporation or formation,  as the case
     may be;



<PAGE>


                                       13

          (b) this Agreement has been duly authorized, executed and delivered by
     such Selling Stockholder;

     (c) the sale of the Shares to be sold by such Selling Stockholder hereunder
     and the compliance by such Selling  Stockholder  with all of the provisions
     of  this  Agreement  and  the  consummation  of  the  transactions   herein
     contemplated  will not conflict  with or result in a breach or violation of
     any of the terms or  provisions  of, or  constitute  a default  under,  any
     statute,  any indenture,  mortgage,  deed of trust, loan agreement or other
     agreement or instrument to which such Selling  Stockholder is a party or by
     which such Selling  Stockholder is bound or to which any of the property or
     assets of such Selling Stockholder is subject,  nor will such action result
     in any violation of the provisions of the certificate of  incorporation  or
     by-laws  of such  Selling  Stockholder  if such  Selling  Stockholder  is a
     corporation,  the partnership agreement of such Selling Stockholder if such
     Selling  Stockholder is a partnership,  or any applicable law or statute or
     any order,  rule or regulation of any court or governmental  agency or body
     having  jurisdiction over such Selling  Stockholder or the property of such
     Selling  Stockholder,  in each case  other than such  conflicts,  breaches,
     violations or defaults which individually or in the aggregate (i) would not
     have a material adverse effect on the general affairs, business, prospects,
     management,  financial  position or results of  operations  of such Selling
     Stockholder,  (ii) would not have a Material Adverse Effect and (iii) would
     not affect the validity,  performance or consummation  of the  transactions
     contemplated herein; no consent, approval,  authorization,  order, license,
     registration  or  qualification  of or with any such court or  governmental
     agency or body is required for the consummation by such Selling Stockholder
     of the transactions  contemplated by this Agreement,  except such consents,
     approvals,    authorizations,    orders,    licenses,    registrations   or
     qualifications as have been obtained under the Securities Act and as may be
     required  under state  securities or blue sky laws in  connection  with the
     purchase and distribution of the Shares by the Underwriters;

          (d) such  Selling  Stockholder  will  have,  immediately  prior to the
     Closing  Date and  assuming  due  issuance of the Shares to be sold by such
     Selling  Stockholder  to be issued upon  conversion of the Notes,  good and
     valid  title to such  Shares  free and  clear  of all  mortgages,  pledges,
     security  interests,  liens,  claims,  encumbrances or equities,  with full
     right and  authority to deliver the same  hereunder;  upon  delivery of and
     payment for such Shares pursuant to this Agreement, good and valid title to
     such Shares, free and clear of all liens, encumbrances, equities or claims,
     will pass to the  Underwriters,  assuming the  Underwriters  have purchased
     such Shares in good faith and without notice of any such lien, encumbrance,
     equity  or claim or any other  adverse  claim  within  the  meaning  of the
     Uniform Commercial Code (as in effect in the State of New York);




<PAGE>


                                       14

          (e) such Selling  Stockholder has not taken nor will it take, directly
     or  indirectly,  any  action  designed  to, or which  might  reasonably  be
     expected to, cause or result in  stabilization or manipulation of the price
     of the Common Stock;

          (f) the  sale of the  Shares  to be sold by such  Selling  Stockholder
     hereunder  is not  prompted  by any  material  information  concerning  the
     Company  or its  subsidiary  which  is not set  forth  in the  Registration
     Statement or the Prospectus;

          (g) to the  extent,  and only to the  extent,  of written  information
     relating to such Selling Stockholder furnished to the Company in writing by
     or on  behalf  of  such  Selling  Stockholder  expressly  for  use  in  any
     preliminary  prospectus,  each preliminary  prospectus filed as part of the
     Registration  Statement  as  originally  filed or as part of any  amendment
     thereto,  or filed pursuant to Rule 424 under the  Securities  Act, did not
     contain an untrue  statement of a material fact or omit to state a material
     fact, in each case with respect to such Selling Stockholder, required to be
     stated therein or necessary to make the statements therein, in light of the
     circumstances under which they were made, not misleading;

          (h) to the  extent,  and only to the  extent,  of written  information
     relating to such Selling Stockholder furnished to the Company in writing by
     or on  behalf  of  such  Selling  Stockholder  expressly  for  use  in  the
     Registration  Statement and the Prospectus (as amended or  supplemented  if
     the Company shall have furnished any  amendments or  supplements  thereto),
     the  Registration  Statement and the Prospectus (as amended or supplemented
     if the Company shall have furnished any amendments or supplements  thereto)
     do  not  and  will  not,  as  of  the  applicable  effective  date  of  the
     Registration  Statement and any amendment thereto and as of the date of the
     Prospectus  and any  amendment or  supplement  thereto,  contain any untrue
     statement of a material  fact or omit to state any material  fact,  in each
     case  with  respect  to such  Selling  Stockholder,  required  to be stated
     therein or necessary to make the statements therein not misleading, and the
     Prospectus, as amended or supplemented, if applicable, at the Closing Date,
     will not contain any untrue statement of a material fact or omit to state a
     material  fact,  in each case with  respect  to such  Selling  Stockholder,
     necessary to make the  statements  therein,  in light of the  circumstances
     under which they were made, not misleading; and

          (i) such Selling  Stockholder  has not  distributed  and, prior to the
     later of (i) the Closing Date and (ii) the  completion of the  distribution
     of the Shares, will not distribute any offering material in connection with
     the offering and sale of the Shares other than the Registration  Statement,
     the  Prospectus,  any  amendment or  supplement  thereto,  any  preliminary
     pro-

<PAGE>


                                       15

     spectus or any other materials, if any, permitted by the Securities Act.

     5.  (A)  The  Company  covenants  and  agrees  with  each  of  the  several
     Underwriters as follows:

          (a) to use its best  efforts to cause the  Registration  Statement  to
     become  effective at the earliest  possible time and, if required,  to file
     the final Prospectus with the Commission  within the time periods specified
     by Rule 424(b) and Rule 430A under the  Securities Act and to file promptly
     all reports and any definitive proxy or information

     statements required to be filed by the Company with the Commission pursuant
     to Section 13(a),  13(c), 14 or 15(d) of the Exchange Act subsequent to the
     date of the  Prospectus  and for so long as the delivery of a prospectus is
     required in  connection  with the  offering  or sale of the Shares;  and to
     furnish copies of the Prospectus to the Underwriters in New York City prior
     to 10:00 a.m., New York City time, on the Business Day next  succeeding the
     date of  this  Agreement  in such  quantities  as the  Representatives  may
     reasonably request;

          (b) to deliver,  at the expense of the Company, to the Representatives
     four signed copies of the Registration  Statement (as originally filed) and
     each  amendment  thereto,  in each case  including  exhibits and  documents
     incorporated  by  reference  therein,  and  to  each  other  Underwriter  a
     conformed copy of the Registration Statement (as originally filed) and each
     amendment  thereto,  in  each  case  without  exhibits  but  including  the
     documents incorporated by reference therein and, during the period referred
     to in paragraph (e) below,  to each of the  Underwriters  as many copies of
     the  Prospectus  (including all  amendments  and  supplements  thereto) and
     documents  incorporated  by reference  therein as the  Representatives  may
     reasonably request;

          (c) before  filing any  amendment or  supplement  to the  Registration
     Statement  or  the  Prospectus,  whether  before  or  after  the  time  the
     Registration Statement becomes effective, to furnish to the Representatives
     a copy of the proposed  amendment or supplement  for review and not to file
     any such  proposed  amendment or  supplement  to which the  Representatives
     reasonably object;

          (d) to advise the Representatives promptly, and to confirm such advice
     in writing (i) when the Registration  Statement has become effective,  (ii)
     when any amendment to the Registration  Statement has been filed or becomes
     effective,  (iii) when any  supplement  to the  Prospectus  or any  amended
     Prospectus  has been filed and to furnish the  Representatives  with copies
     thereof,  (iv) of any request by the  Commission  for any  amendment to the
     Registration  Statement or any amendment or supplement to the Prospectus or
     for any  additional  information,  (v) of the issuance by the Commission of
     any stop order suspending the  effectiveness of the Registration  Statement
     or of any  order  preventing  or  suspending  the  use  of any  preliminary
     prospectus  or the  Prospectus  or the  initiation  or  threatening  of any
     proceeding for that purpose,

<PAGE>


                                       16

     (vi) of the  occurrence  of any  event,  within the  period  referenced  in
     paragraph (e) below, as a result of which the Prospectus as then amended or
     supplemented  would include an untrue  statement of a material fact or omit
     to state  any  material  fact  necessary  in  order to make the  statements
     therein, in the light of the circumstances when the Prospectus is delivered
     to a purchaser, not misleading,  and (vii) of the receipt by the Company of
     any notification with respect to any suspension of the qualification of the
     Shares  for  offer  and  sale  in any  jurisdiction  or the  initiation  or
     threatening of any proceeding

     for such  purpose;  and to use its best  efforts to prevent the issuance of
     any such stop order,  or of any order  preventing or suspending  the use of
     any preliminary  prospectus or the Prospectus,  or of any order  suspending
     any such  qualification  of the shares,  or  notification of any such order
     thereof  and,  if  issued,  to obtain as soon as  possible  the  withdrawal
     thereof;

          (e) if,  during such period of time after the first date of the public
     offering of the Shares as in the opinion of counsel for the  Underwriters a
     prospectus  relating to the Shares is required  by law to be  delivered  in
     connection with sales by the  Underwriters  or any dealer,  any event shall
     occur as a  result  of which it is  necessary  to amend or  supplement  the
     Prospectus  in  order  to make  the  statements  therein,  in  light of the
     circumstances  when  the  Prospectus  is  delivered  to  a  purchaser,  not
     misleading,  or if it is necessary to amend or supplement the Prospectus to
     comply with law,  forthwith to prepare and  furnish,  at the expense of the
     Company,  to the Underwriters and to the dealers (whose names and addresses
     the  Representatives  will furnish to the Company) to which Shares may have
     been sold by the  Representatives  on behalf of the Underwriters and to any
     other  dealers  upon  request,   such  amendments  or  supplements  to  the
     Prospectus as may be necessary so that the  statements in the Prospectus as
     so amended or supplemented will not, in the light of the circumstances when
     the  Prospectus  is delivered to a purchaser,  be misleading or so that the
     Prospectus will comply with law;

          (f) to  endeavor  to  qualify  the Shares for offer and sale under the
     securities or blue sky laws of such  jurisdictions  as the  Representatives
     shall  reasonably  request and to continue such  qualification in effect so
     long as reasonably  required for distribution of the Shares;  provided that
     the Company  shall not be required to file a general  consent to service of
     process in any such jurisdiction;

          (g) to make  generally  available to its  security  holders and to the
     Representatives  as soon as  practicable an earnings  statement  covering a
     period of at least twelve months beginning with the first fiscal quarter of
     the  Company  occurring  after  the  effective  date  of  the  Registration
     Statement,  which shall  satisfy  the  provisions  of Section  11(a) of the
     Securities Act and Rule 158 promulgated thereunder;




<PAGE>


                                       17

     (h)  so  long  as  the  Shares  are  outstanding,  to  furnish  to the
     Representatives copies of all reports or other communications (financial or
     other)  furnished  to holders of the Shares,  and copies of any reports and
     financial  statements  furnished  to or filed  with the  Commission  or any
     national securities exchange;

     (i) for a period of 90 days after the date of the initial  public  offering
     of the Shares, not to, directly or indirectly,  (i) offer, pledge, announce
     the intention to sell, sell,  contract to sell, sell any option or contract
     to  purchase,  purchase  any option or contract to sell,  grant any option,
     right or warrant to purchase or otherwise transfer or dispose of any shares
     of Common Stock or any  securities of the Company  which are  substantially
     similar to the Common Stock,  including  but not limited to any  securities
     convertible into or exercisable or exchangeable  for, or that represent the
     right to receive, Common Stock or (ii) enter into any swap, option, future,
     forward or other agreement that transfers,  in whole or in part, any of the
     economic consequences of ownership of the Common Stock or any securities of
     the Company which are  substantially  similar to the Common Stock,  whether
     any such transaction described in clause (i) or (ii) above is to be settled
     by delivery of Common Stock or such other securities,  in cash or otherwise
     without the prior written consent of J.P. Morgan  Securities  Inc., in each
     case other than (w) the Shares to be sold by the Company hereunder, (x) any
     options to be granted or shares of Common  Stock  issued  upon  exercise of
     options  granted or to be granted under the Company's  employee or director
     stock option plans  existing on the date of the  Prospectus,  (y) shares of
     Common Stock issued upon exercise of warrants of the Company outstanding on
     the date of the  Prospectus  or (z)  shares of  Common  Stock  issued  upon
     conversion of convertible  notes of the Company  (including but not limited
     to the Notes) outstanding on the date of the Prospectus;

          (j) to use the net  proceeds  received by the Company from the sale of
     the Shares to be sold by the Company  hereunder by the Company  pursuant to
     this Agreement in a manner  consistent  with the  description of the use of
     proceeds in the Prospectus under the caption "Use of Proceeds";

          (k) to list, subject to official notice of issuance, the Shares on the
     Nasdaq National Market (the "Nasdaq National Market"); and

          (l) whether or not the transactions contemplated in this Agreement are
     consummated or this Agreement is terminated, to pay or cause to be paid all
     costs  and  expenses   incident  to  the  performance  of  its  obligations
     hereunder,  including without limiting the generality of the foregoing, all
     costs and expenses (i) incident to the preparation, registration, transfer,
     execution,  issuance  and  delivery  of the  Shares,  (ii)  incident to the
     preparation,   printing  and  filing  under  the   Securities  Act  of  the
     Regis-

<PAGE>


                                       18

     tration Statement, the Prospectus and any preliminary prospectus (including
     in each case all  exhibits,  amendments  and  supplements  thereto),  (iii)
     incurred in connection with the registration or qualification of the Shares
     under the laws of such jurisdictions as the  Representatives  may designate
     (including  fees of counsel for the  Underwriters  and its  disbursements),
     (iv) in  connection  with the listing of the Shares on the Nasdaq  National
     Market,  (v) related to the filing with,  and clearance of the offering by,
     the National  Association of Securities  Dealers,  Inc., (vi) in connection
     with the printing  (including word  processing and  duplication  costs) and
     delivery of this  Agreement,  any blue sky memoranda and the  furnishing to
     the Underwriters  and dealers of copies of the  Registration  Statement and
     the Prospectus, including mailing and shipping, as

     herein provided,  (vii) any expenses  incurred by the Company in connection
     with a "road show" presentation to potential investors,  (viii) the cost of
     preparing stock  certificates and (ix) the cost and charges of any transfer
     agent and any registrar.

     (B) Each of the Selling Stockholders  covenants and agrees with the several
Underwriters as follows:

          (a) prior to the Closing Date, to take all action  required  under the
     Notes by such  Selling  Stockholder  to convert a portion of the Notes into
     the Shares to be sold by such Selling Stockholder hereunder; and

          (b) for a  period  of 90 days  after  the date of the  initial  public
     offering of the Shares, not to, directly or indirectly,  (i) offer, pledge,
     announce the intention to sell, sell,  contract to sell, sell any option or
     contract to purchase,  purchase  any option or contract to sell,  grant any
     option,  right or warrant to purchase or  otherwise  transfer or dispose of
     any  shares of Common  Stock or any  securities  of the  Company  which are
     substantially similar to the Common Stock, including but not limited to any
     securities  convertible  into or exercisable or  exchangeable  for, or that
     represent  the right to receive,  Common Stock or (ii) enter into any swap,
     option, future,  forward or other agreement that transfers,  in whole or in
     part, any of the economic  consequences of ownership of the Common Stock or
     any securities of the Company which are substantially similar to the Common
     Stock,  whether any such transaction  described in clause (i) or (ii) above
     is to be settled by delivery of Common Stock or such other  securities,  in
     cash or  otherwise  or (iii) make any demand for or exercise any right with
     respect to the registration of any shares of Common Stock or any securities
     of the Company which are substantially  similar to the Common Stock without
     the prior  written  consent of J.P.  Morgan  Securities  Inc., in each case
     other than (x) the Shares to be sold by such Selling Stockholder hereunder,
     (y) Common Stock to be issued upon conversion of any Note and (z) transfers
     of any Note,  or the shares of Common Stock issued upon  conversion of such
     Note,  to an affiliate (as such term is defined in the  Securities  Act) of
     such Selling  Stock-


<PAGE>


                                       19

     holder  or an entity for which such Selling  Stockholder
     acts as an investment  advisor or manager,  provided that such affiliate or
     such entity, as applicable, agrees to be bound by the terms of this Section
     5(B)(b).

     6. The several  obligations of the  Underwriters  hereunder to purchase the
Shares on the Closing Date or the  Additional  Closing Date, as the case may be,
are  subject  to the  performance  by  the  Company  and  each  of  the  Selling
Stockholders  of their  respective  obligations  hereunder  and to the following
additional conditions:

     (a)  the  Registration  Statement  shall  have  become  effective  (or if a
     post-effective  amendment is required to be filed under the Securities Act,
     such  post-effective  amendment shall have become effective) not later than
     5:00  P.M.,  New York City  time,  on the date  hereof;  and no stop  order
     suspending  the   effectiveness  of  the  Registration   Statement  or  any
     post-effective  amendment  shall be in effect,  and no proceedings for such
     purpose  shall be  pending  before or  threatened  by the  Commission;  the
     Prospectus  shall  have been  filed with the  Commission  pursuant  to Rule
     424(b) within the applicable time period  prescribed for such filing by the
     rules and  regulations  under the  Securities  Act and in  accordance  with
     Section 5(A) hereof; and all requests for additional information shall have
     been complied with to the satisfaction of the Representatives;

          (b) the  representations and warranties of the Company and the Selling
     Stockholders contained herein are true and correct on and as of the Closing
     Date or the Additional  Closing Date, as the case may be, as if made on the
     Closing Date or the  Additional  Closing  Date, as the case may be, and the
     Company and each of the Selling  Stockholders  shall have complied with all
     agreements  and all  conditions  on their part to be performed or satisfied
     hereunder at or prior to the Closing Date or the  Additional  Closing Date,
     as the case may be;

          (c) since the respective dates as of which information is given in the
     Prospectus,  there shall not have been any change in the  capital  stock or
     long-term  debt of the  Company  or any  Material  Adverse  Change,  or any
     development involving a prospective Material Adverse Change, otherwise than
     as set forth or contemplated in the Prospectus,  the effect of which in the
     judgment of the  Representatives  makes it  impracticable or inadvisable to
     proceed  with the  public  offering  or the  delivery  of the Shares on the
     Closing Date or the  Additional  Closing  Date,  as the case may be, on the
     terms and in the manner  contemplated  in the  Prospectus;  and neither the
     Company  nor its  subsidiary  has  sustained  since the date of the  latest
     audited financial  statements  included or incorporated by reference in the
     Prospectus any material loss or  interference  with its business from fire,
     explosion, flood or other calamity, whether or not covered by insurance, or
     from any labor dispute or court or  governmental  action,  order or decree,
     otherwise than as set forth or contemplated in the Prospectus;



<PAGE>


                                       20

     (d) the  Representatives  shall have received on and as of the Closing Date
     or the  Additional  Closing Date, as the case may be, (1) a certificate  of
     the Chief  Executive  Officer and Chief  Financial  Officer of the Company,
     satisfactory to the Representatives, to the effect set forth in subsections
     (a)  through  (d)  (with   respect  to  the   respective   representations,
     warranties, agreements and conditions of the Company) of this Section 6 and
     to the further  effect that there has not  occurred  any  Material  Adverse
     Change, or any development involving a prospective Material Adverse Change,
     from that set forth or contemplated in the Registration Statement and (2) a
     certificate  of an executive  officer of each of the Selling  Stockholders,
     satisfactory to the  Representatives  to the effect set forth in subsection
     (b) of this  Section 6 (with  respect  to the  respective  representations,
     warranties, agreements and conditions of the Selling Stockholders);

          (e) Proskauer Rose LLP, counsel for the Company,  shall have furnished
     to the Representatives their written opinion, dated the Closing Date or the
     Additional  Closing  Date,  as the  case  may  be,  in form  and  substance
     satisfactory to the Representatives, to the effect that:

               (i) the  Registration  Statement has become  effective  under the
          Securities Act and, to the best of such counsel's  knowledge,  no stop
          order suspending the  effectiveness  of the Registration  Statement or
          suspending or preventing the use of the Prospectus is in effect and no
          proceedings  for that purpose have been  instituted  or are pending or
          threatened by the Commission;

               (ii) based solely on certificates of public officials in the case
          of  clauses  (x)  and  (z)  below,  (x)  the  Company  has  been  duly
          incorporated and is validly existing as a corporation in good standing
          under  the laws of the  State of  Delaware,  (y) the  Company  has the
          corporate  power and authority to own its  properties  and conduct its
          business as described in the Prospectus,  and (z) the Company has been
          duly  qualified  as a  foreign  corporation  for  the  transaction  of
          business  and is in good  standing  under the laws of the State of New
          Jersey;

               (iii) based  solely on  certificates  of public  officials in the
          case  of  clauses  (x)  and  (z)  below,  (x)  Celgro  has  been  duly
          incorporated and is validly existing as a corporation in good standing
          under the laws of  Delaware,  (y) Celgro has the  corporate  power and
          authority to own its  properties and conduct its business as described
          in the Prospectus, and (z) Celgro has been duly qualified as a foreign
          corporation  for the  transaction  of business and is in good standing
          under  the  laws of New  Jersey;  and all the  outstanding  shares  of
          capital stock of Celgro have been duly  authorized and validly issued,
          are  fully-paid  and  non-assessable,  and are  owned by the  Company,
          directly  or  indirectly,  free and clear of all liens,  encumbrances,
          security interests and claims;

               (iv)  other than as set forth in the  Prospectus,  to the best of
          such counsel's knowledge,  there are no actions,  suits or proceedings
          pending or threatened  against the Company or its subsidiary or any of
          their respective  properties which are required to be described in the
          Prospectus but are not so described; and to the best of such counsel's
          knowledge, there are no contracts or other documents that are required
          to be described in the  Registration  Statement or Prospectus or to be
          filed as exhibits to the Registration Statement that are not described
          or filed as required;


<PAGE>


                                       21


               (v)  this  Agreement  has  been  duly  authorized,  executed  and
          delivered by the Company;

               (vi) the Company has an  authorized  capitalization  as set forth
          under "Capitalization" in the Prospectus;

               (vii)  all of the  outstanding  shares  of  capital  stock of the
          Company have been duly and validly  authorized  and issued,  are fully
          paid  and  non-assessable  and are  free  of  statutory  and,  to such
          counsel's  knowledge,  contractual  pre-emptive rights; and, except as
          described in or expressly  contemplated  by the  Prospectus and to the
          best of such  counsel's  knowledge,  there are no  outstanding  rights
          (including,  without  limitation,  pre-emptive  rights),  warrants  or
          options to acquire,  or instruments  convertible  into or exchangeable
          for,  any  shares of capital  stock or other  equity  interest  in the
          Company,  its  subsidiary,  or any  contract,  commitment,  agreement,
          understanding  or  arrangement of any kind relating to the issuance of
          any capital stock of the Company, its subsidiary, any such convertible
          or exchangeable securities or any such rights, warrants or options;

               (viii) the Company Shares and the Option Shares,  when issued and
          delivered to and paid for by the  Underwriters  in accordance with the
          terms of this  Agreement,  will be duly  and  validly  authorized  and
          issued  and will be fully  paid and  non-assessable;  and the  Company
          Shares and the Option Shares,  when issued,  will be free of statutory
          and, to our knowledge, contractual preemptive rights;

               (ix) the issuance of the Selling Stockholder Shares in accordance
          with  the  terms  of  the  Notes  upon   conversion   by  the  Selling
          Stockholders  has been duly authorized and reserved for issuance,  and
          when issued in accordance with the terms of the Notes, will be validly
          issued, fully paid and non-assessable;

               (x) the Notes  were duly and  validly  authorized,  executed  and
          delivered  and  constitute  legal,   valid  and  binding   obligations
          enforceable in accordance  with their terms,  except as may be limited
          by  bankruptcy,  insolvency,  reorganization  and other  similar  laws
          affecting  the rights and remedies of creditors  generally and general
          equity principles, whether applied by a court of equity or law;

               (xi) to such  counsel's  knowledge,  except for rights which have
          been  waived,  no  person  has the right to  require  the  Company  to
          register any securities for offering and sale under the Securities Act
          by  reason  of the  filing  of the  Registration  Statement  with  the
          Commission,  or the  issuance and sale of the


<PAGE>


                                       22


          Shares to be sold by the Company  hereunder  or, to the  knowledge  of
          such  counsel,  the  sale of the  Shares  to be  sold  by the  Selling
          Stockholders hereunder;

               (xii) the  statements in the  Prospectus  under  "Description  of
          Capital Stock" and in the  Registration  Statement in Item 15, insofar
          as such  statements  constitute  a summary  of the terms of the Common
          Stock,  legal matters,  documents or proceedings  referred to therein,
          fairly present the information  called for with respect to such terms,
          legal matters, documents or proceedings;

               (xiii) the  Registration  Statement  and the  Prospectus  and any
          supplement or amendment  thereto (other than any financial  statements
          and related schedules therein as to which no belief need be expressed)
          comply as to form in all material respects with the Securities Act;

               (xiv) such counsel  shall state that they have,  in the course of
          the  preparation  of the  Registration  Statement and the  Prospectus,
          participated in conferences with officers and other representatives of
          the Company, with the Company's independent public accountants and the
          Underwriters,  at which  conferences  they made certain  inquiries and
          investigations  in  connection  with the  Registration  Statement  and
          Prospectus   and  (without   taking  any  further   action  to  verify
          independently  the accuracy or  completeness of the statements made in
          the Registration Statement and the Prospectus and, except as stated in
          their  opinion,  without  assuming  responsibility  for the  accuracy,
          completeness or fairness of such statements) nothing has come to their
          attention  that  causes them to believe  that either the  Registration
          Statement  in the  form  it  originally  became  effective  under  the
          Securities  Act and as of the Closing Date or the  Additional  Closing
          Date, as the case may be,  contained or contains any untrue  statement
          of a  material  fact or  omitted  or omits to  state a  material  fact
          required  to be stated  therein or  necessary  to make the  statements
          therein not  misleading or that the Prospectus as of its date or as of
          the Closing Date or the  Additional  Closing Date, as the case may be,
          contained  or  contains  any untrue  statement  of a material  fact or
          omitted or omits to state a material  fact  necessary in order to make
          the statements therein, in light of the circumstances under which they
          were made, not misleading (except that such counsel makes no statement
          with respect to the financial  statements and supporting schedules and
          other financial data derived therefrom included in or omitted from the
          Registration Statement or the Prospectus).

               (xv) the issuance  and sale of the Shares being  delivered by the
          Company on the Closing Date or the  Additional  Closing  Date,  as the
          case may be,  the


<PAGE>


                                       23


          issuance  of  the  Shares  to be  sold  by  the  Selling  Stockholders
          hereunder  to  be  issued  upon   conversion  of  the  Notes  and  the
          performance by the Company of its obligations under this Agreement and
          the  consummation  of the  transactions  contemplated  herein will not
          conflict  with or result in a breach of, or constitute a default under
          (nor  constitute  an event which with notice,  lapse of time, or both,
          would  constitute a breach of or default under)  provisions of (A) any
          indenture,  mortgage, deed of trust, loan agreement or other agreement
          or instrument to which the Company or its  subsidiary is a party or by
          which the Company or its  subsidiary is bound or to which any of their
          respective  properties or assets is subject,  (B) the  certificate  of
          incorporation  or the by-laws of the  Company,  (C) any federal or New
          York law,  regulation,  rule,  or the General  Corporation  Law of the
          State of Delaware,  or (D) to such  counsel's  knowledge,  any decree,
          judgment or order applicable to the Company or its Subsidiary, except,
          in each case other than Clause (B) above,  for  conflicts  breaches or
          defaults  which would not have, or would not be  reasonably  likely to
          have, a Material Adverse Effect;

               (xvi) no consent, approval,  authorization or order of, or filing
          with, any federal, state or local government or regulatory commission,
          board,  body,  authority or agency is required for the consummation by
          the Company of the transactions contemplated by this Agreement,  other
          than registration  under the Securities Act (except that we express no
          opinion as to any necessary  qualification  under state  securities or
          blue sky laws in connection with the purchase and  distribution of the
          Shares by the Underwriters);

               (xvii)  the  Company  is not,  and  after  giving  effect  to the
          issuance and sale of the Shares will not be, an  "investment  company"
          or an entity  "controlled"  by an "investment  company," as such terms
          are defined in the Investment Company Act; and

               (xviii) the  documents  filed  pursuant to the  Exchange  Act and
          incorporated  by reference in the Prospectus or any further  amendment
          or supplement  thereto by the Company prior to the Closing Date or the
          Additional  Closing  Date,  as  the  case  may  be  (except  as to the
          financial  statements and related  schedules  therein,  as to which no
          belief need be expressed),  when they were filed with the  Commission,
          complied as to form in all material  respects with the requirements of
          the Exchange  Act,  and the rules and  regulations  of the  Commission
          thereunder.

          In rendering  such  opinions,  such counsel may rely (A) as to matters
     involving the  application of laws other than the laws of the United States
     and the States of New


<PAGE>


                                       24


     York and  Delaware,  to the extent  such  counsel  deems  proper and to the
     extent  specified in such  opinion,  if at all, upon an opinion or opinions
     (in form and substance reasonably satisfactory to Underwriters' counsel) of
     other counsel reasonably acceptable to the Underwriters' counsel,  familiar
     with the  applicable  laws;  (B) as to matters of fact,  to the extent such
     counsel  deems  proper,  on  certificates  of  responsible  officers of the
     Company and  certificates  or other  written  statements  of  officials  of
     jurisdictions   having  custody  of  documents   respecting  the  corporate
     existence or good standing of the Company.  The opinion of such counsel for
     the Company  shall state that the  opinion of any such other  counsel  upon
     which they  relied is in form  satisfactory  to such  counsel  and, in such
     counsel's  opinion,  the  Underwriters  and they are  justified  in relying
     thereon.

          The opinion of Proskauer Rose LLP described above shall be rendered to
     the Underwriters at the request of the Company and shall so state therein;

          (f) Joanne P. Acford, Esq., Vice President and Counsel of John Hancock
     Life Insurance  Company,  shall have furnished to the  Representatives  her
     written opinion,  dated the Closing Date or the Additional Closing Date, as
     the case may be, in form and substance satisfactory to the Representatives,
     to the effect that:

               (i) each of the Selling  Stockholders has full legal right, power
          and authority to enter into this Agreement;

               (ii)  this  Agreement  has been  duly  authorized,  executed  and
          delivered by each Selling Stockholder;

               (iii) the execution,  delivery and  performance of this Agreement
          by each Selling  Stockholder,  compliance by each Selling  Stockholder
          with  all  of  the  provisions  herein  and  the  consummation  of the
          transactions  contemplated  hereby will not (a)  require any  consent,
          approval,  authorization or other order of, or qualification with, any
          court  or  governmental   body  or  agency  (except  for  filings  for
          informational  purposes  and except such as may be required  under the
          Securities  Act and state  securities or Blue Sky laws),  (b) conflict
          with or constitute a breach of any of the terms or provisions of, or a
          default  under,  the  charter or  by-laws  (if a  corporation)  or the
          partnership agreement (if a partnership), of such Selling Stockholder,
          (c) to her knowledge, conflict with or constitute a material breach of
          any of the terms or provisions of, or a material  default  under,  any
          indenture,  loan  agreement,  mortgage,  lease or other  agreement  or
          instrument that is material to such Selling Stockholder, or (d) to her
          knowledge,  violate or conflict with any  applicable  law or any rule,
          regulation, judgment, order or decree of any court or any governmental
          body or agency having  jurisdiction  over such Selling  Stockholder or
          its property,  in any manner


<PAGE>


                                       25


          which,  individually  or in the aggregate,  would affect the validity,
          performance or consummation of the  transactions  contemplated by this
          Agreement;

               (iv)  to her  knowledge,  on  the  date  on  which  each  Selling
          Stockholder  delivered  its Shares to the  Underwriters,  such Selling
          Stockholder  had good and valid title to the Shares listed beside such
          Selling  Stockholder's  name on Schedule II attached hereto,  free and
          clear of all liens, encumbrances, equities or claims, and each Selling
          Stockholder  had full  right,  power and  authority  to sell,  assign,
          transfer and deliver such Shares;

               (v) upon delivery of and payment for the Shares being sold by the
          Selling Stockholders pursuant to this Agreement,  good and valid title
          to such Shares, free and clear of all liens, encumbrances, equities or
          claims, will pass to the Underwriters, assuming such Underwriters have
          purchased  such  Shares in good faith and  without  notice of any such
          lien,  encumbrance,  equity or claim or any other adverse claim within
          the meaning of the Uniform  Commercial Code (as in effect in the State
          of New York);

               (vi) such  counsel  shall  state  that no facts  have come to her
          attention to cause her to believe that to the extent,  and only to the
          extent, that written information  relating to the Selling Stockholders
          was  furnished  to  the  Company  by  or  on  behalf  of  the  Selling
          Stockholders  expressly for use in the Registration  Statement and the
          Prospectus, (A) the Registration Statement and the Prospectus included
          therein  (other than any financial  statements  and related  schedules
          therein as to which no belief need be expressed) at its effective date
          contained an untrue statement of a material fact or omitted to state a
          material fact, in each case with respect to the Selling  Stockholders,
          required  to be stated  therein or  necessary  to make the  statements
          contained therein not misleading or (B) the Prospectus (other than any
          financial  statements  and  related  schedules  therein as to which no
          belief need be  expressed),  as of its date and as of the Closing Date
          or the  Additional  Closing  Date,  as the case may be,  contained  or
          contains an untrue statement of a material fact or omitted or omits to
          state a  material  fact,  in each case  with  respect  to the  Selling
          Stockholders,  necessary to make the statements  contained therein, in
          light of the circumstances under which they were made, not misleading.

          In rendering  such  opinions,  such counsel may rely (A) as to matters
     involving the  application of laws other than the laws of the United States
     and the  Commonwealth  of  Massachusetts,  to the extent such counsel deems
     proper and to the extent  specified  in such  opinion,  if at all,  upon an
     opinion or  opinions  (in form and  substance  reasonably  satisfactory  to
     Underwriters'  counsel)  of  other  counsel  reasonably  acceptable


<PAGE>


                                       26


     to the Underwriters' counsel,  familiar with the applicable laws; (B) as to
     matters of fact, to the extent such counsel deems proper,  on  certificates
     of  responsible  officers  of  the  any  of the  Selling  Stockholders  and
     certificates  or other  written  statements  of officials of  jurisdictions
     having  custody of documents  respecting  the  corporate  existence or good
     standing of any Selling  Stockholder.  The opinion of such  counsel for the
     Selling  Stockholder shall state that the opinion of any such other counsel
     upon which they relied is in form satisfactory to such counsel and, in such
     counsel's  opinion,  the  Underwriters  and they are  justified  in relying
     thereon.

          The  opinion  of Joanne P.  Acford,  Esq.,  described  above  shall be
     rendered to the Underwriters at the request of the Selling Stockholders and
     shall so state therein;

          (g) on the date  hereof and the  effective  date of the most  recently
     filed post-effective amendment filed on or subsequent to the date hereof to
     the  Registration  Statement  and also on the  Closing  Date or  Additional
     Closing Date, as the case may be, KPMG shall have furnished to you letters,
     dated the  respective  dates of  delivery  thereof,  in form and  substance
     satisfactory  to you,  containing  statements  and  information of the type
     customarily included in accountants' "comfort letters" to underwriters with
     respect to the  financial  statements  and  certain  financial  information
     contained or  incorporated by reference in the  Registration  Statement and
     the Prospectus;

          (h) the  Representatives  shall have received on and as of the Closing
     Date or  Additional  Closing Date, as the case may be, an opinion of Cahill
     Gordon & Reindel,  counsel  to the  Underwriters,  with  respect to the due
     authorization and valid issuance of the Shares, the Registration Statement,
     the  Prospectus  and  other  related  matters  as the  Representatives  may
     reasonably  request,  and such counsel  shall have received such papers and
     information as they may reasonably request to enable them to pass upon such
     matters;

          (i) the  Shares to be  delivered  on the  Closing  Date or  Additional
     Closing  Date,  as the case may be, shall have been approved for listing on
     the Nasdaq National Market, subject to official notice of issuance;

          (j) on or prior to the Closing Date or Additional Closing Date, as the
     case may be, the Company and the Selling  Stockholders shall have furnished
     to the  Representatives  such  further  certificates  and  documents as the
     Representatives shall reasonably request; and

          (k) the lock-up agreements,  each substantially in the form of Exhibit
     A hereto,  between you and each of the  Company's  executive  officers  and
     directors,  delivered to you on or before the date hereof, shall be in full
     force and effect on the Closing Date or  Additional  Closing  Date,  as the
     case may be.


<PAGE>


                                       27


     7. The Company agrees to indemnify and hold harmless each  Underwriter  and
each  affiliate  of  any  Underwriter  which  assists  such  Underwriter  in the
distribution of the Shares and each person, if any, who controls any Underwriter
within the meaning of either  Section 15 of the  Securities Act or Section 20 of
the  Exchange  Act,  from and against any and all  losses,  claims,  damages and
liabilities  (including,  without limitation,  the legal fees and other expenses
incurred  in  connection  with any  suit,  action  or  proceeding  or any  claim
asserted)  caused by (i) any untrue  statement or alleged untrue  statement of a
material fact  contained in the  Registration  Statement or the  Prospectus  (as
amended or  supplemented  if the Company shall have  furnished any amendments or
supplements thereto) or any preliminary prospectus, or caused by any omission or
alleged  omission to state therein a material fact required to be stated therein
or necessary to make the  statements  therein not  misleading or (ii) any untrue
statement or alleged untrue  statement of a material fact contained in any audio
or visual  materials  prepared by the Company or based upon written  information
furnished by or on behalf of the Company including, without limitation,  slides,
videos,  films,  tape  recordings  used in connection  with the marketing of the
Shares,  including,  without limitation,  statements  communicated to securities
analysts  employed  by the  Underwriters,  except in each case  insofar  as such
losses,  claims,  damages or liabilities  are caused by any untrue  statement or
omission or alleged  untrue  statement or omission  made in reliance upon and in
conformity with information relating to any Underwriter furnished to the Company
in writing by such  Underwriter  through the  Representatives  expressly for use
therein.

     The Selling Stockholders agree, severally and not jointly, to indemnify and
hold harmless  each  Underwriter  and each  affiliate of any  Underwriter  which
assists such Underwriter in the  distribution of the Shares and each person,  if
any, who controls any Underwriter within the meaning of either Section 15 of the
Securities  Act or Section 20 of the Exchange  Act, from and against any and all
losses,  claims,  damages and liabilities  (including,  without limitation,  the
legal fees and other expenses  incurred in connection  with any suit,  action or
proceeding  or any claim  asserted)  caused by any untrue  statement  or alleged
untrue statement of a material fact contained in the  Registration  Statement or
the Prospectus (as amended or  supplemented  if the Company shall have furnished
any amendments or supplements thereto) or any preliminary prospectus,  or caused
by any omission or alleged omission to state therein a material fact required to
be stated  therein or necessary to make the statements  therein not  misleading,
but in each case to the extent and only to the extent that such losses,  claims,
damages or liabilities are caused by any untrue statement or omission or alleged
untrue  statement  or omission  made in  reliance  upon and in  conformity  with
information  furnished to the Company in writing by or on behalf of such Selling
Stockholder expressly for use therein;  provided,  however, that the obligations
of any Selling  Stockholder  under the foregoing  indemnity shall not exceed the
net proceeds received by such Selling Stockholder from the sale of the Shares to
be sold by such Selling  Stockholder  hereunder  (which net  proceeds  shall not
include the Underwriters' discounts).


<PAGE>


                                       28


     Each Underwriter  agrees,  severally and not jointly, to indemnify and hold
harmless  the Company,  its  directors,  its officers who sign the  Registration
Statement and each person who controls the Company within the meaning of Section
15 of the  Securities  Act and  Section 20 of the  Exchange  Act and each of the
Selling  Stockholders  to the same extent as the  foregoing  indemnity  from the
Selling Stockholders to each Underwriter, but only with reference to information
furnished   to  the  Company  in  writing  by  such   Underwriter   through  the
Representatives expressly for use in the Registration Statement, the Prospectus,
any amendment or supplement thereto, or any preliminary prospectus.

     If any suit, action,  proceeding  (including any governmental or regulatory
investigation),  claim or demand shall be brought or asserted against any person
in respect of which indemnity may be sought pursuant to the preceding paragraphs
of this Section 7, such person (the "Indemnified  Person") shall promptly notify
the  person or  persons  against  whom  such  indemnity  may be sought  (each an
"Indemnifying  Person") in writing, and such Indemnifying  Persons, upon request
of the Indemnified Person,  shall retain counsel reasonably  satisfactory to the
Indemnified  Person to  represent  the  Indemnified  Person  and any  others the
Indemnifying Persons may designate in such proceeding and shall pay the fees and
expenses of such counsel related to such proceeding. In any such proceeding, any
Indemnified Person shall have the right to retain its own counsel,  but the fees
and expenses of such counsel shall be at the expense of such Indemnified  Person
and not the  Indemnifying  Persons unless (i) the  Indemnifying  Persons and the
Indemnified  Person  shall  have  mutually  agreed  to the  contrary,  (ii)  the
Indemnifying  Persons  has failed  within a  reasonable  time to retain  counsel
reasonably  satisfactory to the Indemnified Person or (iii) the named parties in
any  such  proceeding   (including  any  impleaded   parties)  include  both  an
Indemnifying  Person  and the  Indemnified  Person  and  representation  of both
parties by the same counsel  would be  inappropriate  due to actual or potential
differing  interests between them. It is understood that no Indemnifying  Person
shall,  in  connection  with any  proceeding  or related  proceeding in the same
jurisdiction, be liable for the fees and expenses of more than one separate firm
(in addition to any local  counsel) for all  Indemnified  Persons,  and that all
such  fees and  expenses  shall be  reimbursed  as they are  incurred.  Any such
separate firm for the  Underwriters,  each  affiliate of any  Underwriter  which
assists  such  Underwriter  in the  distribution  of the Shares and such control
persons of Underwriters shall be designated in writing by J.P. Morgan Securities
Inc. and any such separate firm for the Company, its directors, its officers who
sign the Registration Statement and such control persons of the Company shall be
designated  in writing by the Company,  any such  separate  firm for the Selling
Stockholders  shall be  designated  in writing by each Selling  Stockholder.  No
Indemnifying  Person  shall  be  liable  for any  settlement  of any  proceeding
effected  without its written  consent,  but if settled  with such consent or if
there be a final judgment for the plaintiff,  each Indemnifying Person agrees to
indemnify  any  Indemnified  Person from and against  any loss or  liability  by
reason of such settlement or judgment.  Notwithstanding  the foregoing sentence,
if at any time an Indemnified Person shall have requested an Indemnifying Person
to  reimburse  the  Indemnified  Person  for fees and  expenses  of


<PAGE>


                                       29


counsel as  contemplated  by the second and third  sentences of this  paragraph,
such  Indemnifying  Person agrees that it shall be liable for any  settlement of
any proceeding  effected  without its written  consent if (i) such settlement is
entered into more than 30 days after receipt by such Indemnifying  Person of the
aforesaid  request and (ii) such  Indemnifying  Person shall not have reimbursed
the Indemnified Person in accordance with such request prior to the date of such
settlement.  No Indemnifying Person shall,  without the prior written consent of
the  Indemnified  Person,  effect any  settlement  of any pending or  threatened
proceeding  in respect of which any  Indemnified  Person is or could have been a
party and indemnity could have been sought hereunder by such Indemnified Person,
unless such settlement  includes an  unconditional  release of such  Indemnified
Person  from all  liability  on  claims  that  are the  subject  matter  of such
proceeding.

     If the  indemnification  provided for in the first three paragraphs of this
Section 7 is unavailable to an Indemnified  Person or insufficient in respect of
any losses,  claims,  damages or  liabilities  referred  to  therein,  then each
Indemnifying  Person  under  such  paragraph,   in  lieu  of  indemnifying  such
Indemnified Person thereunder, shall contribute to the amount paid or payable by
such  Indemnified  Person  as a  result  of  such  losses,  claims,  damages  or
liabilities  (i) in such  proportion as is  appropriate  to reflect the relative
benefits  received by the Company and the Selling  Stockholders  on the one hand
and the  Underwriters  on the other hand from the offering of the Shares or (ii)
if the  allocation  provided by clause (i) above is not  permitted by applicable
law, in such  proportion  as is  appropriate  to reflect  not only the  relative
benefits  referred  to in clause  (i) above but also the  relative  fault of the
Company and the Selling Stockholders on the one hand and the Underwriters on the
other hand in connection  with the statements or omissions that resulted in such
losses, claims, damages or liabilities,  as well as any other relevant equitable
considerations.  The relative  benefits  received by the Company and the Selling
Stockholders  on the one hand and the  Underwriters  on the other  hand shall be
deemed to be in the same  respective  proportions  as the net proceeds  from the
offering  (before  deducting  expenses)  received by the Company and the Selling
Stockholders and the total underwriting  discounts and the commissions  received
by the Underwriters,  in each case as set forth in the table on the cover of the
Prospectus,  bear to the  aggregate  public  offering  price of the Shares.  The
relative fault of the Company and the Selling  Stockholders  on the one hand and
the  Underwriters  on the other hand shall be  determined by reference to, among
other things,  whether the untrue or alleged untrue statement of a material fact
or the  omission  or  alleged  omission  to state a  material  fact  relates  to
information  supplied  by the Company  and the  Selling  Stockholders  or by the
Underwriters and the parties' relative intent, knowledge,  access to information
and opportunity to correct or prevent such statement or omission.

     The Company,  the Selling  Stockholders and the Underwriters  agree that it
would not be just and equitable if contribution  pursuant to this Section 7 were
determined  by pro rata  allocation  (even if the  Selling  Stockholders  or the
Underwriters  were  treated  as one entity  for such  purposes)  or by any other
method of allocation that does not take account of


<PAGE>


                                       30


the equitable considerations referred to in the immediately preceding paragraph.
The amount paid or payable by an  Indemnified  Person as a result of the losses,
claims,  damages  and  liabilities  referred  to in  the  immediately  preceding
paragraph  shall be deemed to  include,  subject  to the  limitations  set forth
above,  any  legal or other  expenses  incurred  by such  Indemnified  Person in
connection   with   investigating   or  defending  any  such  action  or  claim.
Notwithstanding  the  provisions  of this  Section  7, (i) in no event  shall an
Underwriter  be  required  to  contribute  any amount in excess of the amount by
which the total price at which the Shares  underwritten by it and distributed to
the public were  offered to the public  exceeds  the amount of any damages  that
such  Underwriter has otherwise been required to pay by reason of such untrue or
alleged untrue statement or omission or alleged omission, (ii) in no event shall
the amount  required to be  contributed  by any Selling  Stockholder  exceed the
amount by which the net proceeds  received by such Selling  Stockholder  through
the  sale  of the  Shares  to be sold by such  Selling  Stockholder  (which  net
proceeds  shall not include the  Underwriters'  discounts)  to the  Underwriters
exceeds the amount of any damages that such Selling  Stockholder  has  otherwise
been  required  to pay by reason of its untrue or alleged  untrue  statement  or
omission or alleged omission.  No person guilty of fraudulent  misrepresentation
(within the meaning of Section ll(f) of the Securities Act) shall be entitled to
contribution   from  any  person   who  was  not   guilty  of  such   fraudulent
misrepresentation.  The Underwriters' obligations to contribute pursuant to this
Section 7 are several in proportion to the respective number of Shares set forth
opposite  their  names  in  Schedule  I  hereto,  and  not  joint.  The  Selling
Stockholders'  obligations to contribute  pursuant to this Section 7 are several
and not joint.

     The remedies provided for in this Section 7 are not exclusive and shall not
limit any rights or remedies which may otherwise be available to any indemnified
party at law or in equity.

     The indemnity and contribution  agreements  contained in this Section 7 and
the representations and warranties of the Company,  the Selling Stockholders and
the  Underwriters set forth in this Agreement shall remain operative and in full
force and effect  regardless of (i) any termination of this Agreement,  (ii) any
investigation  made by or on behalf of any Underwriter or any person controlling
any Underwriter or by or on behalf of the Company,  its officers or directors or
any other person  controlling  the Company or any Selling  Stockholder and (iii)
acceptance of and payment for any of the Shares.

     8.  Notwithstanding  anything  herein  contained,  this  Agreement  (or the
obligations of the several  Underwriters  with respect to the Option Shares) may
be terminated in the absolute discretion of the Representatives, by notice given
to the Company and the Selling Stockholders, if after the execution and delivery
of this  Agreement  and prior to the Closing Date (or, in the case of the Option
Shares,  to the  Company  prior to the  Additional  Closing  Date)  (i)  trading
generally shall have been suspended or materially  limited on or by, as the case
may be, any of the New York Stock Exchange or the American Stock  Exchange,  the


<PAGE>


                                       31


National  Association  of Securities  Dealers,  Inc.,  the Chicago Board Options
Exchange,  the Chicago  Mercantile  Exchange or the Chicago Board of Trade, (ii)
trading  of any  securities  of or  guaranteed  by the  Company  shall have been
suspended on any  exchange or in any  over-the-counter  market,  (iii) a general
moratorium on commercial banking activities in New York shall have been declared
by either  Federal  or New York  State  authorities  or (iv)  there  shall  have
occurred any outbreak or  escalation of  hostilities  or any change in financial
markets or any calamity or crisis that, in the judgment of the  Representatives,
is material and adverse and which, in the judgment of the Representatives, makes
it impracticable to market the Shares being delivered at the Closing Date or the
Additional  Closing  Date,  as the case may be, on the  terms and in the  manner
contemplated in the Prospectus.

     9. This  Agreement  shall become  effective upon the later of (x) execution
and delivery hereof by the parties hereto and (y) release of notification of the
effectiveness   of  the   Registration   Statement  (or,  if   applicable,   any
post-effective amendment) by the Commission.

     If on the Closing Date or the Additional  Closing Date, as the case may be,
any one or more of the  Underwriters  shall  fail or refuse to  purchase  Shares
which it or they  have  agreed  to  purchase  hereunder  on such  date,  and the
aggregate  number of Shares which such  defaulting  Underwriter or  Underwriters
agreed  but  failed or refused to  purchase  is not more than  one-tenth  of the
aggregate number of Shares to be purchased on such date, the other  Underwriters
shall be obligated  severally in the  proportions  that the number of Shares set
forth  opposite  their  respective  names  in  Schedule  I  hereto  bears to the
aggregate number of Underwritten Shares set forth opposite the names of all such
non-defaulting Underwriters, or in such other proportions as the Representatives
may  specify,  to  purchase  the Shares  which such  defaulting  Underwriter  or
Underwriters  agreed but failed or refused to  purchase  on such date;  provided
that in no event shall the number of Shares that any  Underwriter  has agreed to
purchase pursuant to Section 1 hereof be increased pursuant to this Section 9 by
an amount in excess of  one-ninth  of such number of Shares  without the written
consent of such  Underwriter.  If on the Closing Date or the Additional  Closing
Date, as the case may be, any Underwriter or  Underwriters  shall fail or refuse
to purchase  Shares  which it or they have agreed to purchase  hereunder on such
date,  and the  aggregate  number of Shares with  respect to which such  default
occurs is more than one-tenth of the aggregate  number of Shares to be purchased
on such date, and arrangements satisfactory to the Representatives,  the Company
and the Selling Stockholders for the purchase of such Shares are not made within
36 hours after such default,  this Agreement (or the  obligations of the several
Underwriters to purchase the Option Shares,  as the case may be) shall terminate
without liability on the part of any non-defaulting Underwriter,  the Company or
the  Selling  Stockholders.  In any such case  either  you,  the  Company or the
Selling  Stockholders  shall have the right to postpone the Closing Date (or, in
the case of the Option Shares, either you or the Company shall have the right to
postpone the  Additional  Closing  Date),  but in no event for longer than seven
days, in order that the required changes, if any, in the Registration  Statement
and in the Prospectus or in any other documents or


<PAGE>


                                       32


arrangements  may be effected.  Any action taken under this paragraph  shall not
relieve any defaulting  Underwriter  from liability in respect of any default of
such Underwriter under this Agreement.

     10. If this Agreement  shall be terminated by the  Underwriters,  or any of
them,  because  of any  failure  or  refusal  on the part of the  Company or the
Selling  Stockholders  to  comply  with  the  terms  or to  fulfill  any  of the
conditions of this Agreement,  or if for any reason any of the Company or any of
the Selling  Stockholders  shall be unable to perform its obligations under this
Agreement or any condition of the Underwriters' obligations cannot be fulfilled,
the Company agrees to reimburse the Underwriters or such Underwriters as have so
terminated  this  Agreement  with  respect  to  themselves,  severally,  for all
out-of-pocket  expenses  (including  the  fees  and  expenses  of  its  counsel)
reasonably  incurred by the Underwriter in connection with this Agreement or the
offering contemplated hereunder.

     11. This  Agreement  shall inure to the benefit of and be binding  upon the
Company,  the Selling  Stockholders,  the Underwriters and each affiliate of any
Underwriter  which assists such  Underwriter in the  distribution of the Shares,
any controlling  persons referred to herein and their respective  successors and
assigns.  Nothing  expressed or mentioned in this Agreement is intended or shall
be  construed  to give  any  other  person,  firm or  corporation  any  legal or
equitable  right,  remedy or claim under or in respect of this  Agreement or any
provision herein contained. No purchaser of Shares from any Underwriter shall be
deemed to be a successor by reason merely of such purchase.

     12.  Any  action  by  the  Underwriters  hereunder  may  be  taken  by  the
Representatives jointly or by J.P. Morgan Securities Inc. alone on behalf of the
Underwriters,  and any such action  taken by the  Representatives  jointly or by
J.P. Morgan  Securities Inc. alone shall be binding upon the  Underwriters.  All
notices  and other  communications  hereunder  shall be in writing  and shall be
deemed to have been duly given if mailed or  transmitted by any standard form of
telecommunication.   Notices  to  the   Underwriters   shall  be  given  to  the
Representatives,  c/o J.P. Morgan Securities Inc., 60 Wall Street, New York, New
York 10260 (telefax:  212-648-5705),  Attention:  Syndicate Department,  copy to
Cahill  Gordon & Reindel,  80 Pine Street,  New York,  New York 10005  (telefax:
212-269-5420), Attention: Gerald S. Tanenbaum, Esq. Notices to the Company shall
be given to it at its office,  7 Powder Horn Drive,  Warren,  New Jersey  07059,
(telefax:  [ ]), Attention:  [ ]. Notices to the Selling  Stockholders  shall be
given to to them, c/o John Hancock Mutual Life Insurance Company,  200 Clarendon
Street,  Boston,   Massachusetts  02117  (telefax:   617-572-9268),   Attention:
Christine Miller,  Esq.,  Assistant Counsel,  copy to Choate, Hall & Stewart, 53
State Street, Boston,  Massachusetts 02109 (telefax:  617-248-4000),  Attention:
James R.  Kane,  Esq.  Copies  of  notices  to the  Company  should  be given to
Proskauer  Rose LLP, 1585  Broadway,  New York,  New York  10036-8299  (telefax:
212-969-2900), Attention: Robert A. Cantone, Esq.


<PAGE>


                                       33


     13. This Agreement may be signed in counterparts, each of which shall be an
original and all of which together shall constitute one and the same instrument.

     14. THIS  AGREEMENT  SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE  WITH
THE LAWS OF THE STATE OF NEW YORK,  WITHOUT  GIVING  EFFECT TO THE  CONFLICTS OF
LAWS PROVISIONS THEREOF.






<PAGE>


                                       34


     If the foregoing is in accordance with your understanding,  please sign and
return four counterparts hereof.

                                         Very truly yours,

                                         CELGENE CORPORATION


                                         By:
                                            ------------------------------------
                                            Name:
                                            Title:


                                         HANCOCK MEZZANINE
                                            PARTNERS L.P.

                                         By:  Hancock Mezzanine Investments
                                                  LLC, its general partner

                                         By:  John Hancock Life Insurance
                                                  Company, as investment manager


                                         By:
                                            ------------------------------------
                                            Name:
                                            Title:


                                         JOHN HANCOCK LIFE
                                            INSURANCE COMPANY


                                         By:
                                            ------------------------------------
                                            Name:
                                            Title:


<PAGE>


                                       35



                                         JOHN HANCOCK VARIABLE LIFE
                                            INSURANCE COMPANY


                                         By:
                                            ------------------------------------
                                            Name:
                                            Title:


                                         SIGNATURE 1A (CAYMAN), LTD.

                                         By:  John Hancock Life Insurance
                                                  Company, as portfolio advisor


                                         By:
                                            ------------------------------------
                                            Name:
                                            Title:


<PAGE>


                                       36




Accepted:  February [  ], 2000

J.P. MORGAN SECURITIES INC.
PRUDENTIAL SECURITIES INCORPORATED
U.S. BANCORP PIPER JAFFRAY INC.
     Acting severally on behalf of themselves
     and the several  Underwriters  listed in
     Schedule I hereto.

By: J.P. MORGAN SECURITIES INC.


By:
   ------------------------------------
   Name: Michael J. Tiedemann
   Title: Vice President






<PAGE>




                                   SCHEDULE I

                                                                  Number of
                                                             Underwritten Shares
Underwriter                                                    To Be Purchased
- -----------                                                  -------------------

J.P. Morgan Securities Inc..................................
Prudential Securities Incorporated..........................
U.S. Bancorp Piper Jaffray Inc..............................









                                                                   ---------
     Total..................................................       2,484,000
                                                                   =========





<PAGE>



                                   SCHEDULE II

                                                                   Number of
Selling Stockholder                                          Underwritten Shares
- -------------------                                          -------------------
Hancock Mezzanine Partners L.P..............................       258,000
John Hancock Life Insurance Company.........................       233,920
John Hancock Variable Life Insurance Company................         6,880
Signature 1A (Cayman), Ltd..................................        17,200
                                                                   -------
         Total..............................................       516,000
                                                                   =======







                                                                    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
February 9, 2000



                                                                    EXHIBIT 23.3

                     [LETTERHEAD OF PENNIE & EDMONDS LLP]

                                February 9, 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 and Amendment

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]




                                February 9, 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 its name in Celgene's current S-3 Registration Statement.


                                       Very truly yours,

                                       Kleinfeld, Kaplan and Becker

                                       /s/ Alan H. Kaplan
                                       ----------------------
                                           Alan H. Kaplan
                                            For The Firm




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




                                February 9, 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:

     Mathews,  Collins,  Shepherd & Gould P.A. hereby consents to the use of its
name as an expert in the current S-3 Registration.


                                       Very truly yours,

                                       Mathews, Collins, Shepherd & Gould P.A.

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

BMC:ds


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