IMCLONE SYSTEMS INC/DE
S-3/A, 1998-02-10
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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              As filed with the Securities and Exchange Commission
                              on February 10, 1998

                                                      Registration No. 333-39067

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

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                       - - - - - - - - - - - - - - - - - -
                           AMENDMENT NO. 1 TO FORM S-3
             REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

                          IMCLONE SYSTEMS INCORPORATED
             (Exact name of registrant as specified in its charter)

                  Delaware                           04-2834797
         (State or other jurisdiction of          (I.R.S. Employee
         Incorporation or organization)          Identification No.)

                                180 Varick Street
                            New York, New York 10014
                                 (212) 645-1405

    (Address, including zip code, and telephone number, including area code,
                  of registrant's principal executive offices)

                             Harlan W. Waksal, M.D.
              Executive Vice President and Chief Operating Officer
                          ImClone Systems Incorporated
                                180 Varick Street
                            New York, New York 10014

                                    Copy to:
                              Brian W. Pusch, Esq.
                                 Penthouse Suite
                               29 West 57th Street
                            New York, New York 10019
                                 (212) 980-0408

           (Name, address, including zip code, and telephone number,
                   including area code, of agent for service)

     Approximate date of commencement of proposed sale to the public: As soon as
practicable after this Registration Statement becomes effective.

<PAGE>

   
     If the only  securities  being  registered  on this Form are being  offered
pursuant to dividend or interest  reinvestment 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, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box: [x]

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

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

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

     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  Securities  and  Exchange  Commission,  acting
pursuant to Section 8(a), may determine.


<PAGE>

   
                 SUBJECT TO COMPLETION - DATED February 10, 1998

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

                                   PROSPECTUS
                                 450,000 Shares

                          IMCLONE SYSTEMS INCORPORATED

                     Common Stock, par value $.001 per share

   
     The  Registration  Statement,  of  which  this  Prospectus  forms  a  part,
registers  the offer and sale of up to 450,000  shares (the  "Shares") of common
stock,  par value  $.001 per share (the  "Common  Stock"),  of  ImClone  Systems
Incorporated  (the  "Company" or "ImClone") by a certain  holder of options (the
"Options")  to purchase  Common Stock (the "Selling  Stockholder").  The Selling
Stockholder  acquired  the  Options  directly  from  the  Company  in a  private
placement transaction.  See "Selling Stockholder".  The Company will not receive
any of the proceeds from the sale of the Shares by the Selling Stockholder.  The
Company  anticipates  using  proceeds  from the  exercise  of the Options to (i)
continue to fund and expand its research and  development  programs and (ii) for
general corporate purposes.
    

     The Company's  Common Stock is included on the Nasdaq National Market under
the ticker  symbol  "IMCL".  On February 9, 1998 the closing  sale price for the
Common Stock as reported by the Nasdaq National Market was $6.625.

   
     The  Selling  Stockholder  may  sell  the  Shares  from  time  to  time  in
transactions in the open market, in negotiated transactions, or by a combination
of these methods,  at fixed prices that may be changed,  at market prices at the
time of sale, at prices  related to market prices or at negotiated  prices.  The
Selling  Stockholder  may effect these  transactions by selling the Shares to or
through broker-dealers, who may receive compensation in the form of discounts or
commissions  from the Selling  Stockholder  or from the purchasers of the Common
Stock for whom the  broker-dealers  may act as agent or to whom they may sell as
principal,  or both.  After the  passage of the  requisite  period of time,  the
Selling  Stockholder  may also sell the  Shares  pursuant  to Rule 144 under the
Securities Act of 1933, as amended (the "1933 Act"). See "Plan of Distribution."

     The  Company  will  bear  all  of  the  expenses  in  connection  with  the
registration of the Common Stock offered hereby, which expenses are estimated to
be $14,000.  The Selling  Stockholder  will pay any  brokerage  compensation  in
connection with its sale of the Common Stock.
    

<PAGE>

   
AN INVESTMENT IN THE SECURITIES  OFFERED HEREBY  INVOLVES A HIGH DEGREE OF RISK.
SEE "RISK FACTORS" COMMENCING ON PAGE 8.
    

THESE  SECURITIES  HAVE NOT BEEN APPROVED OR  DISAPPROVED  BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES  COMMISSION,  NOR HAS THE SECURITIES
AND  EXCHANGE  COMMISSION  OR ANY STATE  SECURITIES  COMMISSION  PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.

                The date of this Prospectus is February __, 1998


                                       ii

<PAGE>

                                TABLE OF CONTENTS

                                                                            Page
                                                                            ----
   
AVAILABLE INFORMATION.........................................................1
INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE...............................1
CERTAIN FACTORS AFFECTING FORWARD-LOOKING STATEMENTS..........................2
PROSPECTUS SUMMARY............................................................3
RISK FACTORS..................................................................8
USE OF PROCEEDS...............................................................18
SELLING STOCKHOLDER...........................................................18
PLAN OF DISTRIBUTION..........................................................19
LEGAL MATTERS.................................................................20
EXPERTS.......................................................................20
    

                                      iii
<PAGE>

                              AVAILABLE INFORMATION

     The Company is subject to the informational  requirements of the Securities
Exchange  Act of 1934,  as  amended  (the  "Exchange  Act"),  and in  accordance
therewith files reports,  proxy  statements and other  information with the U.S.
Securities  and Exchange  Commission  (the  "Commission").  Such reports,  proxy
statements  and other  information  filed by the  Company can be  inspected  and
copied at the public  reference  facilities  maintained by the Commission at 450
Fifth  Street,  N.W.,  Room 1024,  Washington,  D.C.  20549 and at the  regional
offices of the  Commission at 7 World Trade Center,  13th Floor,  New York,  New
York, l0048 and Northwestern  Atrium Center, 500 West Madison Street, Room 1400,
Chicago,  Illinois 60661-2511.  Copies of such material can be obtained from the
Public Reference Section of the Commission at 450 Fifth Street, N.W. Washington,
D.C. 20549, at prescribed rates. The Commission  maintains a World Wide Web site
that contains  reports,  proxy and information  statements and other information
regarding registrants that file electronically with the Commission.  The address
of the site is http://www.sec.gov.

   
     The  Company  has  filed  with  the  Commission   under  the  1933  Act,  a
Registration Statement on Form S-3 (the "Registration Statement"), of which this
prospectus (the  "Prospectus") is a part, with respect to the securities offered
hereby.  As  permitted  by the rules and  regulations  of the  Commission,  this
Prospectus does not contain all of the information set forth in the Registration
Statement and the exhibits and schedules thereto.  For further  information with
respect to the Company and the securities  offered hereby,  reference is made to
the  Registration  Statement,  including the financial  statements  and exhibits
incorporated  therein  by  reference  or filed as a part  thereof,  which may be
examined  without  charge,  and  copies  of such  material  can be  obtained  at
prescribed rates from the Public Reference Section  maintained by the Commission
at 450 Fifth  Street,  N.W.,  Room  1024,  Washington,  D.C.  20549.  Statements
contained  in this  Prospectus  as to the  contents  of any  contract  or  other
document referred to are not necessarily complete. In each instance reference is
made to the copy of such contract or other  document  filed as an exhibit to the
Registration  Statement  or  otherwise  filed  with the  Commission,  each  such
statement being  qualified in all respects by such reference,  and such contract
or  other  document  shall  be  deemed   incorporated  by  reference  into  this
Prospectus.
    

                 INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

   
     The following  documents filed with the Commission are hereby  incorporated
by reference  and made a part hereof:  (i) the  Company's  Annual Report on Form
10-K for the fiscal year ended  December 31, 1996;  (ii) the  Company's  Current
Reports on Form 8-K, dated February 25, 1997, February 25, 1997, April 14, 1997,
June 3, 1997, October 15, 1997,  December 4, 1997 and January 21, 1998 (iii) the
Company's Quarterly Reports on Form 10-Q for the fiscal quarters ended March 31,
1997,  June 30, 1997 and September  30, 1997;  and (iv) the  description  of the
Common Stock contained in the Company's Registration Statement on Form 8-A dated
October 23, 1991.
    

     All documents filed by the Company  pursuant to Sections  13(a),  13(c), 14
and 15(d) of the  Exchange  Act  subsequent  to the date hereof and prior to the
filing  of a  post-effective  amendment  to  the  Registration  Statement  which
indicates that all shares of Common Stock 


                                       1
<PAGE>

offered  hereby have been sold or which  deregisters  all shares of Common Stock
then remaining unsold, shall be deemed to be incorporated by reference into this
Prospectus and to be part hereof from the date of filing of such documents.

     Any statement  contained herein or in a document  incorporated or deemed to
be incorporated by reference herein shall be deemed to be modified or superseded
for purposes of this Prospectus to the extent that such statement is modified or
superseded by a statement  contained herein or in a subsequently  filed document
which also is or is deemed to be  incorporated by reference into this Prospectus
and to be a part hereof from the date filing of such documents.

   
     The Company will provide,  without  charge,  to each person  (including any
beneficial  owner) to whom this  Prospectus is  delivered,  upon written or oral
request of such person,  a copy of any and all of the information  that has been
incorporated  by reference in this  Prospectus  (not including  exhibits to such
information).  Such  requests  should be  directed  to Harlan W.  Waksal,  M.D.,
Executive Vice President and Chief Operating Officer, at the Company's principal
executive  offices at 180 Varick  Street,  7th Floor,  New York, New York 10014,
telephone (212) 645-1405.
    

CERTAIN FACTORS AFFECTING FORWARD-LOOKING STATEMENTS

     This  Prospectus,  including  the documents  and  information  incorporated
herein by reference,  contain  forward-looking  statements that involve risk and
uncertainties.  The Company's actual  operations,  performance and results could
differ   materially   from  those   reflected  in,  or  anticipated   by,  these
forward-looking  statements.  In  evaluating  the  Company  and its  operations,
performance and results,  investors  should  consider,  among other things,  the
factors  discussed  herein under "Risk Factors" and the risks and  uncertainties
discussed  in the  Company's  most recent  Annual  Report on Form 10-K under the
captions  "Business"  and  "Management's  Discussion  and  Analysis of Financial
Condition and Results of Operations", in the Company's Quarterly Reports on Form
10-Q and in the  Company's  other  reports filed under the Exchange Act, in each
case incorporated herein by reference.


                                       2
<PAGE>

                               PROSPECTUS SUMMARY

     The  following  summary is qualified  in its entirety by the more  detailed
information, "Risk Factors" and financial statements including the notes thereto
included or incorporated by reference in this Prospectus. The securities offered
hereby involve a high degree of risk. See "Risk Factors."

The Company

     ImClone  Systems  Incorporated  is  a  biopharmaceutical   company  engaged
primarily  in the  research  and  development  of  therapeutic  products for the
treatment  of  cancer  and  cancer-related   disorders.  The  Company's  product
candidates include interventional therapeutics for cancer and cancer vaccines.

     C225.  The  Company's  lead  interventional  therapeutic  for  cancer  is a
chimerized  (part mouse,  part human)  antibody that acts to block the Epidermal
Growth  Factor  receptor  ("EGFr").  EGFr is  expressed  in select  normal human
tissues and has been shown to be  over-expressed  in the cells of  approximately
one-third  of all human  cancers.  Extensive  in vivo animal  studies with human
tumors have shown that C225 in combination with various  chemotherapeutic agents
(doxorubicin,  cisplatin or paclitaxel) demonstrates a pronounced enhancement of
the anti-tumor effect of the chemotherapeutic  agents, resulting in the complete
destruction of human tumors in  substantially  all the animals in these studies.
These studies have demonstrated long-term, tumor-free survival of animals.

   
     Since  December  1994,  the  Company has  initiated  several  Phase  Ib/IIa
clinical  trials of C225 at Memorial  Hospital (the patient care arm of Memorial
Sloan-Kettering   Cancer  Center)   ("Sloan-Kettering"),   Yale  Cancer  Center,
University of Virginia, MD Anderson Cancer Center and the University of Alabama,
among  others.  The  first  study,  involving  a  single  injection  of  C225 at
escalating doses in 13 patients, was completed in March 1995. Subsequent studies
have  been  initiated  with  escalating  doses of C225  both  with  and  without
chemotherapy. A multi-injection study of C225 alone in 17 patients was completed
in February l996. A study of the drug in conjunction  with cisplatin in head and
neck cancer patients began in May 1995 and was completed in October 1996 with 22
patients.  No dose  limiting  toxicities  were  demonstrated  in these  studies.
Studies  with  doxorubicin  in  advanced   prostate  cancer  patients  and  with
paclitaxel  in breast cancer  patients were  initiated in January 1996 and March
1996,   respectively.   Studies  using  C225  alone  and  in  conjunction   with
chemotherapy  and  radiation  in head and  neck  cancer  patients  began in dose
escalation  trials in July 1997,  April 1997 and April  1997,  respectively.  In
December 1997, the Company  initiated a Phase II trial in metastatic  renal cell
carcinoma.  ImClone  expects to initiate  Phase  II/III  studies to evaluate the
potential of C225 in various tumor types,  such as head and neck and  pancreatic
cancers.

     BEC2 Cancer Vaccine. BEC2 is a monoclonal anti-idiotypic antibody which the
Company  believes  may be useful  to  prevent  or delay  the onset of  recurrent
primary tumors or metastatic disease. The antibody, which mimics the ganglioside
GD3,  has been tested since 1991 in Phase I clinical  trials at  Sloan-Kettering
against  certain  forms of  cancer,  including  small-cell  
    


                                       3
<PAGE>

   
lung carcinoma and melanoma. BEC2 has shown statistically  significant prolonged
survival  of  patients  with  small-cell  lung  carcinoma  in a pilot  study  at
Sloan-Kettering.  In December  1990,  the Company  entered  into a research  and
license  agreement  with Merck KGaA  ("Merck"),  a  German-based  pharmaceutical
company to develop therapeutic cancer vaccines, including BEC2, for use in small
cell lung carcinoma and malignant melanoma,  and thereafter amended and extended
the agreement,  most recently in December 1997 (the "Amended Agreement").  Under
the Amended Agreement, Merck has a royalty bearing license to develop and market
BEC2 worldwide,  except that in North America the Company has retained the right
to co-market BEC2. Under the Amended Agreement, Merck is responsible for funding
for a single indication clinical development of BEC2 worldwide; provided that if
such costs exceed 17 million DM, Merck and ImClone  share such excess costs on a
60%/40%  basis.  It is the  intent  of the  parties  that  ImClone  will  be the
manufacturer  of the product  worldwide.  The December  1997  amendment  further
provides for milestone fees of $15,000,000  beyond those called for by the prior
amendment. In connection with the December 1997 amendment,  Merck purchased from
the Company 400,000 shares of the Company's Series A Convertible Preferred Stock
(the  "Series A  Preferred  Shares" or  "Series A  Preferred  Stock")  for total
consideration of $40,000,000. See "Risk Factors - Dilution". As of September 30,
1997,  the Company had earned in fiscal 1997 from its  collaboration  with Merck
$1,500,000  in  milestone  payments,  and  $1,042,000  of  research  and support
payments which  represents the first two of eight  quarterly  payments  totaling
$4.7 million.  ImClone expects that a Phase III multinational clinical trial for
BEC2 for use in treatment in small cell lung  carcinoma will be initiated in the
first half of 1998.
    

     Other Product  Candidates.  The Company is seeking to develop inhibitors of
angiogenesis, which is the formulation of new blood vessels necessary for tissue
growth,  including tumor growth. The Company has acquired  proprietary rights to
the recombinant mouse form of a key receptor involved in angiogenesis, the FLK-1
receptor.  The Company has developed  various  antibodies with high affinity for
the receptor and its human form,  KDR which block the activation of the receptor
and thereby  inhibit  angiogenesis.  The Company has also initiated a program to
develop small molecule  inhibitors of angiogenesis  and to identify and validate
new targets for  anti-angiogenic  drug  intervention.  These  inhibitors  of the
FLK-1/KDR  receptor may represent a future treatment for inhibiting tumor growth
in those  cancers  that use this  molecular  pathway to  stimulate  blood vessel
development.

     FLK-2 is a tyrosine kinase receptor which is expressed on a  sub-population
of human  hematopoietic  stem  cells,  acute  myeloblastic  leukemia  and  acute
lymphoblastic  leukemia,  and possibly human neural and neural-like  tumors. The
goal  of  the  FLK-2  monoclonal  antibody  program  is to  develop  therapeutic
antibodies that can be used to treat FLK-2 expressing tumors.

     The  Company is also  conducting  research  in  hematopoiesis  (growth  and
development  of blood cell  elements)  aimed at  discovering  factors to support
hematopoietic stem cells and to control the proliferation,  differentiation  and
functional  deterioration of hematopoietic elements. The Company has obtained an
exclusive  license  from  The  National  Institutes  of  Health  ("NIH")  to the
delta-like  ("DLK") protein and gene for use in stem cell and gene therapy.  DLK
is a member  of a family  of  proteins  which  appears  to have the  ability  to
maintain cells in an undifferentiated state. The Company also has entered into a
non-exclusive license and supply agreement with Immunex Corporation  ("Immunex")
for use of the  FLK-2/FLT-3  ligand for ex 


                                       4
<PAGE>

vivo  cell  therapies.  Immunex  has a  license  from the  Company  to the FLK-2
receptor,  limited to the use by Immunex in the  manufacture of the  FLK-2/FLT-3
ligand.

     The Company has developed a recombinant molecular variant of Interleukin-6,
a  naturally  occurring  hematopoietic  growth  factor.  IL-6m has been shown in
animal tests to significantly stimulate the production of platelets and has been
shown by others in  pre-clinical  trials to be a  critical  factor in liver cell
regeneration.  A pilot human  clinical  trial of IL-6m was initiated at Hadassah
Hospital in  Jerusalem,  Israel in early 1994 in  pre-chemotherapeutic  patients
with ovarian or lung cancer which trial was discontinued.  In addition, IL-6m is
being supplied to outside academic laboratories.

   
     The Company has licensed its  diagnostic  and  infectious  disease  vaccine
product areas, based on its earlier research,  to corporate partners for further
development  and  commercialization.  The Company has granted the  Wyeth/Lederle
division of American Home  Products  Corporation  ("American  Home") a worldwide
license to manufacture  and market certain of its infectious  disease  vaccines,
which are in development. The Company has also entered into a strategic alliance
with Abbott  Laboratories  ("Abbott") pursuant to which the Company has licensed
certain of its diagnostic  products to Abbott on a worldwide basis. In mid-1995,
Abbott  launched  in  Europe  its first  DNA-based  test,  using  the  Company's
technology, for the diagnosis of the sexually transmitted disease chlamydia. The
Company is entitled to receive  milestone  payments and  royalties in connection
with future sales of such diagnostic products. In December 1996, the Company and
Abbott  modified  this  agreement  to  provide  for  an  exclusive  sublicensing
agreement  with Chiron  Diagnostics  ("Chiron")  for the Company's  patented DNA
signal amplification  technology,  AMPLIPROBE.  Under the terms of the agreement
all sales of Chiron  branched  DNA  diagnostic  probe  technology  in  countries
covered by Company  patents  will be subject to a royalty to Abbott to be passed
through  to the  Company.  In May 1997,  a  European  patent  was issued for the
Company's  proprietary  Repair Chain Reaction ("RCR") DNA probe technology which
was licensed to Abbott under the 1992  strategic  alliance.  The issuance of the
patent  entitled  the  Company  to  receive  two  milestone   payments  totaling
$1,000,000  and royalty  payments  on sales in covered  European  countries  for
products using the Company's RCR  technology.  Abbott will be entitled to deduct
from royalties  otherwise  due, 25% of such royalties due for a two-year  period
and 50% thereafter  until a total of $500,000 has been  deducted.  In June 1997,
the Company  received the  $1,000,000 in milestone  payments and as of September
30, 1997 had received a total of $117,000 in royalty fees.

     Research and Development.  The Company  initiated its in-house research and
development efforts in 1986. The Company has assembled a scientific staff with a
variety  of  complementary   skills  in  a  broad  base  of  advanced   research
technologies,  including  oncology,  immunology,  cell  biology  and protein and
synthetic  chemistry.  The Company has also  recruited a staff of technical  and
professional employees to carry out manufacturing of clinical trial materials at
its  Somerville,  New  Jersey  manufacturing  facility.  Of  the  Company's  106
full-time  personnel  on January  30,  1998,  47 were  employed  in its  product
development,  clinical  and  manufacturing  programs,  31 in research  and 28 in
administration.  The Company's staff includes 15 persons with Ph.D.  degrees and
two with M.D. degrees.
    

                                       5
<PAGE>

     In  addition  to  its  research  programs  pursued  in-house,  the  Company
collaborates  with certain  academic  institutions to support  research in areas
related to the Company's product development efforts. These institutions include
the National Cancer  Institute,  Sloan-Kettering,  the University of California,
Princeton  University,  the University of North Carolina,  The Wistar Institute,
The  University  of  Texas  Southwestern  Medical  Center  and The  Mario  Negri
Institute for Pharmacological  Research.  Usually, research supported at outside
academic  institutions  is performed in  conjunction  with  additional  in-house
research.  The Company also has collaborations with institutions  related to the
performance of its clinical trials. Such institutions  include  Sloan-Kettering,
Yale Cancer Center,  the University of Virginia,  MD Anderson Cancer Center, and
the University of Alabama.

   
     In October 1997, the Company entered into a  collaboration  with CombiChem,
Inc.  ("CombiChem")  to discover  and  develop  novel  small  molecules  against
selected  targets  for  the  treatment  of  cancer.  In the  collaboration,  the
companies will utilize CombiChem's  Discovery  Engine(TM) and Universal Informer
Library(TM)  to generate small  molecules for screening in ImClone's  assays for
identification of lead candidates. The Company also made an equity investment in
CombiChem.

     The  Company  operates  a  facility  in  Somerville,  New  Jersey  for  the
manufacture  of bulk  materials  of its  therapeutic  candidates  in quality and
quantity sufficient for human clinical trials. At this facility,  the Company is
producing C225 bulk drug. At this facility,  the Company also supports  clinical
development of both the C225 and BEC2 programs.
    

     The  Company  was  incorporated  in  Delaware  in 1984  and  commenced  its
principal  research and  development  operations  in March 1986.  The  Company's
principal  executive  offices and laboratories are located at 180 Varick Street,
New York, New York, 10014, and the telephone number is (212) 645-1405.


                                       6
<PAGE>

                                  The Offering

Common Stock
   being Offered.................  The Prospectus  relates to an offering by the
                                   Selling  Stockholder  of up to 450,000 shares
                                   of Common Stock which underly the Options.
   
    
Common Stock Outstanding
   after the Offering............. As  of  January  30,  1998  the  Company  had
                                   24,306,810    shares    of    Common    Stock
                                   outstanding. Assuming that all of the Options
                                   are  exercised  and no other shares of Common
                                   Stock are issued  subsequent  to January  30,
                                   1998,  the  Company  would  have   24,756,810
                                   shares of Common Stock outstanding.
   
    
Use of Proceeds................... The Company  will not  receive  any  proceeds
                                   from the sale of the  Shares  offered  by the
                                   Selling  Stockholder.  If all of the  Options
                                   are  exercised,   the  Company  will  receive
                                   estimated  proceeds of $506,250.  The Company
                                   anticipates  using any proceeds received from
                                   the  exercise  of the Options (i) to continue
                                   to  fund  and   expand   its   research   and
                                   development  programs  and (ii)  for  general
                                   corporate    purposes,    including   working
                                   capital. See "Use of Proceeds."

Nasdaq National
  Market Symbol.................. IMCL

   
Risk Factors.....................  See  "Risk   Factors"  for  a  discussion  of
                                   certain   risk   factors   that   should   be
                                   considered   by   prospective   investors  in
                                   connection  with an  investment in the Shares
                                   offered hereby.
    

                                       7
<PAGE>

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

                                  RISK FACTORS

   
     An  investment  in the Shares  offered by this  Prospectus  involves a high
degree of risk. In addition to the other  information  contained or incorporated
by reference in this  Prospectus,  the  following  factors  should be considered
carefully in evaluating an investment in the Shares offered hereby.
    

     Early Stage of Product Development;  Technological Uncertainty. The Company
was founded in 1984 and opened its laboratory in New York in 1986. Substantially
all of the Company's products are in research or the early stages of development
or clinical  studies.  Substantially  all the Company's  revenues were generated
from license and research  arrangements with corporate  sponsors.  The Company's
revenues under its research and license  agreements with corporate sponsors have
fluctuated  and are expected to fluctuate  significantly  from period to period.
Similarly,  the Company's results of operations have fluctuated and are expected
to fluctuate  significantly  from period to period.  These variations have been,
and are expected to be, based primarily on the timing of entering into supported
research and license  agreements,  the status of  development  of the  Company's
various products,  the timing and level of revenues from sales by its partner in
diagnostics,  Abbott, of products bearing the Company's technology, the addition
or  termination  of research  programs or funding  support,  performance  by the
Company's corporate collaborators of their funding obligations,  the achievement
of specified  research or  commercialization  milestones  and  variations in the
level of expenditures  for the Company's  proprietary  products during any given
period. The Company's products will require substantial  additional  development
and  clinical  testing and  investment  prior to  commercialization.  To achieve
profitable  operations,  the Company,  alone or with others,  must  successfully
develop,  introduce and market its products.  No assurance can be given that any
of the Company's  product  development  efforts will be successfully  completed,
that required  regulatory  approvals  can be obtained or that any  products,  if
developed,  will be successfully  manufactured  or marketed or achieve  customer
acceptance.

     History of  Operating  Losses and  Accumulated  Deficit.  The  Company  has
experienced  significant  operating  losses in each year since its inception due
primarily to substantial research and development expenditures.  As of September
30, 1997, the Company had an accumulated  deficit of approximately $113 million.
The Company expects to incur significant  additional  operating losses over each
of the next several years.

   
     Cash Requirements;  Need for Additional  Funding.  The Company has expended
and will  continue to expend in the future  substantial  funds to  continue  the
research and  development  of its  products,  conduct  preclinical  and clinical
trials, establish  clinical-scale and commercial-scale  manufacturing in its own
facilities or in the facilities of others, and market its products.

     The  Company  expects to incur  substantial  funding  requirements  for the
expansion of operations,  including (i) the expansion of the clinical  trials of
C225 and the related  manufacturing  program to support these trials and (ii) in
an effort to develop new  product  


                                       8
<PAGE>

candidates the expansion of research and development  activities including among
other  things,  increased  staffing,  the  acquisition  of  equipment,  and  the
consummation of new outside research agreements. In addition,  $2,200,000 of the
Industrial   Development  Revenue  Bonds  issued  by  the  New  York  Industrial
Development  Agency  ("NYIDA")  in 1990  scheduled  to become  due in 2004 shall
become due upon the termination of the lease (the "Lease") for the Company's New
York facility. The Lease is scheduled to expire in March 1999 and the Company is
currently  in  discussions   regarding  its  extension  and  considering   other
alternatives.  Assuming the extension of the Lease, the Company expects that its
capital  resources,  including  the ongoing  research  support of its  corporate
partners,  will be sufficient to fund its operations for  approximately the next
two and one-half years.  The receipt of certain of such ongoing research support
is subject to attaining  research and development  milestones,  certain of which
have not yet been  achieved.  No  assurance  can be given  that there will be no
change  in  projected  research  support  (including  research  and  development
milestones), or in other expenses that would lead to the Company's capital being
consumed at a faster  rate than  currently  expected,  or that the Lease will be
extended.  The Company will require significant levels of additional capital and
intends to raise the necessary  capital  through  additional  arrangements  with
corporate partners, equity or debt financings or from other sources. There is no
assurance  that  the  Company  will  be  successful  in  consummating  any  such
arrangements or financings.

     The Company has entered into  preliminary  discussions  with several  major
pharmaceutical  companies concerning the funding of research and development for
certain of its products in research.  No assurance can be given that the Company
will be successful in pursuing any such alternatives.  In addition,  the Company
is in preliminary  discussions with several major pharmaceutical  companies with
respect  to a  strategic  alliance  for  the  development  of its  lead  product
candidate,  C225.  Such a strategic  alliance  could include an up-front  equity
investment and technology  access fees plus milestone fees and revenue  sharing.
There can be no assurance  that the Company will be successful in achieving such
an  alliance,  nor can the  Company  predict  the amount of funds which might be
available  to it if it entered  into such an  alliance or the time at which such
funds would be made available.
    

     Pursuant  to the  terms of the  Company's  Series A  Preferred  Stock,  the
holders of the Series A Preferred  Shares are entitled to receive,  out of funds
legally available therefor, cumulative dividends at the annual rate of $6.00 per
share, compounded annually. Dividends are payable on the then outstanding Series
A Preferred  Shares in cash upon the earlier of (i) annually on December 31st of
each year  beginning on December 31, 1999;  or (ii) at the time of conversion or
redemption of the Series A Preferred Shares on which the dividend is being paid.
Dividends on the Series A Preferred  Shares  accumulate and accrue from December
15, 1997 (the date of original issuance) and accrue  thereafter,  whether or not
earned or declared. As of January 30, 1998, dividends aggregating  approximately
$309,000 had accrued on the Series A Preferred Shares.

   
     Dilution.  Warrants to purchase  2,313,650  shares of the Company's  Common
Stock (which includes 1,331,650 warrants held by directors,  officers, employees
and consultants),  at an average exercise price of approximately $2.76 per share
(subject to adjustment)  and stock options to purchase  2,810,595  shares of the
Company's  Common Stock (which includes  2,360,595  options 


                                       9
<PAGE>

granted to employees and consultants  under the Company's stock option plans and
the  Options)  at an average  exercise  price of  approximately  $6.17 per share
(subject to  adjustment)  were  outstanding  as of January 30, 1998.  The shares
underlying  such options and warrants  (except for the Options which are covered
by the  Registration  Statement  of  which  this  prospectus  forms a part)  are
covered,  or will be  covered  prior  to  exercise,  by  effective  registration
statements  on file  with  the  Commission.  For the  life of such  options  and
warrants, the holders thereof are given an opportunity to benefit from a rise in
the market price of the Common  Stock with a resulting  dilution of the interest
of other stockholders. The exercise of such options and warrants is likely to be
undertaken  at a time  when  the  Company,  in  all  probability,  could  obtain
additional  equity  capital from the public on terms more  favorable  than those
provided for pursuant to the options and warrants. The exercise of a significant
number of  options  and  warrants  at any one time or the sale of a  substantial
number of shares of Common Stock  acquired  upon exercise of options or warrants
could  adversely  affect the market price of the Company's  Common Stock and the
Company's ability to raise additional equity capital.
    
     
     As of January 30, 1998, 400,000 Series A Preferred Shares were outstanding.
The Series A Preferred  Shares have a stated value of $100. Up to 100,000 Series
A  Preferred  Shares  were  convertible  commencing  on  December  15, 1997 (the
"Issuance  Date");  up to an additional  100,000  Series A Preferred  Shares are
convertible on or after January 1, 2000 (the "Second  Anniversary  Date"); up to
an additional  100,000  Series A Preferred  Shares are  convertible  on or after
January 1, 2001 (the "Third Anniversary  Date"); and up to an additional 100,000
Series A  Preferred  Shares  are  convertible  on or after  January 1, 2002 (the
"Fourth Anniversary Date").  Series A Preferred Shares converted on or after the
Issuance Date and before the Second  Anniversary  are convertible at a per share
conversion price of $12.50;  Series A Preferred Shares converted on or after the
Second Anniversary Date and before the Third Anniversary Date are convertible at
a per share  conversion  price equal to the Average  Market  Price of the Common
Stock for the five (5) consecutive  trading days ending one trading day prior to
the Second Anniversary Date; Series A Preferred Shares converted on or after the
Third Anniversary Date and before the Fourth Anniversary Date are convertible at
a per share  conversion  price equal to the Average  Market  Price of the Common
Stock for the five (5) consecutive  trading days ending one trading day prior to
the Third  Anniversary Date; Series A Preferred Shares converted on or after the
Fourth  Anniversary  Date and before  January 1, 2003 are  convertible  at a per
share  conversion  price equal to 88% of the Average  Market Price of the Common
Stock for the five (5) consecutive  trading days ending one trading day prior to
the Fourth Anniversary Date; and Series A Preferred Shares converted on or after
January 1, 2003 are  convertible  at a per share  conversion  price equal to the
Average  Market Price of the Common Stock for the five (5)  consecutive  trading
days  ending one  trading day prior to the receipt by the Company of a notice of
conversion.  For purposes of computing the  conversion  price,  "Average  Market
Price" of the Common  Stock for any period is the average of the closing  prices
for the Common  Stock for each  trading  day in such  period as  reported by the
Nasdaq  National Market or any trading system on which the Common Stock may then
be quoted.  The conversion price is subject to adjustment in the case of certain
dilutive  events.  Further,  in the event the Average Market Price of the Common
Stock for the five (5) consecutive  trading days ending one trading day prior to
any  trading  day during  which any Series A  Preferred  Shares are  outstanding
exceeds 150% of the conversion  price then in effect,  the Company has the right
to  require  the  holder of the Series A  Preferred  Shares to convert  all such
shares as may then be convertible. In connection with the 


                                       10
<PAGE>

issuance  of  the  Series  A  Preferred   Shares,   Merck  was  granted  certain
registration  rights  with  respect to the  underlying  shares of Common  Stock.
Because,  commencing after the Second  Anniversary Date, the number of shares of
Common Stock into which the Series A Preferred Shares are convertible is related
to the fair  market  value of the Common  Stock,  to the extent the fair  market
value of the  Common  Stock  decreases,  the  number  of  shares  issuable  upon
conversion of the Series A Preferred  Shares will increase.  The conversion of a
significant  number of Series A Preferred Shares,  particularly in circumstances
where  the fair  market  value of the  Common  Stock is  relatively  low,  could
adversely affect the market price of the Common Stock and the Company's  ability
to raise additional equity capital.

     Limited Manufacturing Experience. To be successful,  the Company's products
must be  manufactured  in commercial  quantities in compliance  with  regulatory
requirements  and at  acceptable  costs.  Although  the  Company  has  developed
products in the laboratory and in some cases has produced sufficient  quantities
of materials for  pre-clinical  animal trials and early stage  clinical  trials,
production in late stage clinical or commercial  quantities may create technical
challenges  for the Company.  The Company  owns a facility  which is used as its
clinical-scale  manufacturing  facility. If it commercializes its products,  the
Company  plans  to  adapt  this   facility  for  use  as  its   commercial-scale
manufacturing   facility.   However,  the  Company  has  limited  experience  in
clinical-scale    manufacturing   and   no   experience   in    commercial-scale
manufacturing,  and no  assurance  can be given that the Company will be able to
make the transition to late stage clinical or commercial production.  The timing
and any additional  costs of adapting the facility for commercial  manufacturing
will depend on several  factors,  including  the  progress  of products  through
clinical trials, and are not yet determinable.

   
     Establishing Sales and Marketing Capability.  As a research and development
company,  the  Company  does not  have  significant  experience  in  selling  or
marketing new  products.  The Company's  current  strategy does not  necessarily
include marketing products on its own, as it intends to do so initially through,
or in conjunction with, its corporate partners. See "Risk  Factors-Dependence on
Certain  Contractual  Agreements  with Corporate  Partners." At such time as the
Company  seeks to market  directly  a new  product,  the  Company  will  require
expertise in sales and  marketing.  There can be no  assurance  that the Company
will be able to retain qualified or experienced sales and marketing personnel or
that any efforts  undertaken by such  personnel  will be  successful.  Under the
Company's  Amended  Agreement with Merck, the Company has the right to co-market
BEC2 in North America in the event BEC2 is approved for sale in North America.
    

     Dependence on Certain Contractual  Agreements with Corporate  Partners.  To
date,  the Company has derived  substantially  all,  and the Company  expects to
continue to derive over the next several  years a  substantial  portion,  of its
revenues  related to research and  development  funding and license fee revenues
from agreements with corporate partners.  These agreements typically provide the
corporate  partner with certain rights to  manufacture  and/or market in certain
geographic  areas  specified  products  which are developed  using the Company's
proprietary technology, subject to an obligation to pay royalties to the Company
based on future product sales, if any. Certain of these  agreements  provide for
funding by corporate partners of research  activities  performed by the Company,
and in some  cases for  payments  to the  Company of license  fees  either  upon
entering  into  such  agreements  or upon  achievement  of  specified  research,


                                       11
<PAGE>

regulatory and  commercialization  milestones,  or both. The Company's  revenues
from these agreements are not received at regular intervals,  have fluctuated in
the past and are expected to continue to  fluctuate  in the future.  In general,
the agreements from which the Company derives such revenues are subject to early
termination at the election of the corporate partner. In the past, some of these
arrangements  have been  terminated.  There is no assurance  that  revenues from
these  sources  will be  maintained,  or that the  Company  will  enter into any
additional agreements of a similar nature.

     Under most of these agreements, the corporate partner, at least for certain
territories,  controls  and  is  responsible  for  the  design  and  conduct  of
pre-clinical and clinical trials, seeking and obtaining of regulatory approvals,
establishing  clinical  and  commercial-scale   manufacturing  capabilities  and
manufacturing  and  marketing of products in those  territories.  The amount and
timing of' funding and the investment of other  resources  under such agreements
is controlled by such other parties and also is subject to the risk of financial
or other  difficulties  that may befall such other  parties.  In  addition,  the
corporate partners or their affiliates may be pursuing  alternative  products or
technologies  addressing the same purposes as those which are the subject of the
collaboration  with the  Company.  While  the  Company  believes  its  corporate
partners have or will have an economic motivation to succeed in performing their
obligations under such agreements,  there can be no assurance that the corporate
interests and motivations of these partners will remain consistent with those of
the Company.

     Uncertainties  as to  Patents  and  Proprietary  Technologies.  The  patent
position  of  biopharmaceutical  companies  generally  is highly  uncertain  and
involves complex legal and factual questions. The Company's success will depend,
in part, on its ability to obtain patents on its own products,  obtain  licenses
to use third parties'  technologies,  protect trade secrets, and operate without
infringing the proprietary  rights of others. If the Company is unable to obtain
patents that  adequately  protect its own  products,  or if any of the Company's
proprietary  technologies  were to  conflict  with the  rights  of  others,  the
Company's  ability to commercialize  products using such  technologies  could be
materially and adversely affected.

     The Company  currently is the  exclusive  licensee or assignee of 42 issued
patents worldwide,  24 of which are issued United States patents. The Company is
the  assignee  or  exclusive  licensee  of  approximately  35 families of patent
applications  in the  United  States and in foreign  countries  directed  to its
proprietary  technology.  There can be no assurance that patents will issue as a
result of any of such  applications.  Nor can there be any assurance that issued
patents would be of substantial  protection or commercial benefit to the Company
or would afford the Company  adequate  protection from competing  products.  For
example,  issued  patents may be challenged and declared  invalid.  In addition,
under many of its license agreements with third parties, the Company is required
to meet  specified  milestone or diligence  requirements  in order to retain its
license to such third  party  patents and patent  applications.  There can be no
assurance that the Company will satisfy any of these requirements.

     The  Company  holds  rights  under  certain  third  party  patents  that it
considers  necessary for the  development of its  technology.  It is anticipated
that,  in order to  commercialize  certain of the  products  that the Company is
developing  or may  develop,  the Company  may be required to 


                                       12
<PAGE>

obtain additional licenses to patents from third parties. However, the extent to
which such licenses may be required,  the  availability of such licenses and the
cost of such licenses, if they are available, are uncertain, at present.

     The Company is aware that other parties have filed patent  applications  in
various countries in several areas in which the Company is developing  products.
Some of these  patent  applications  have issued as patents,  and some are still
pending. There can be no assurance that the pending patent applications will not
issue as patents.  Issued  patents are entitled to a rebuttable  presumption  of
validity under the laws of the United States and certain other countries.  These
issued  patents  may  adversely  affect the  ability  of the  Company to develop
commercial products it is attempting to develop. If licenses to such patents are
needed,  there can be no assurance that any such licenses would be obtainable on
acceptable terms.

     The following are some of the areas which may be adversely  affected by the
patents and patent applications of others:

   

     The  Company  has an  exclusive  license to an issued  U.S.  patent for the
murine form of C225, the Company's EGFr antibody product. The Company's licensor
did not seek  patent  protection  outside  the United  States on this  antibody.
Outside  the  United  States,  the  Company  is  relying,  in  part,  on  patent
applications  exclusively  licensed from a major pharmaceutical  company,  which
claim the use of an EGFr antibody in conjunction with  chemotherapeutic  agents.
The  Company  is  currently  prosecuting  these  applications.  There  can be no
assurance that the Company will be successful in these efforts.
    

     The  EGFr  antibodies  being  developed  by the  Company  are  "chimerized"
monoclonal antibodies. Patents have been issued to other biotechnology companies
that cover the  chimerization of antibodies,  and the Company may be required to
obtain  licenses  under these patents in order to  commercialize  its chimerized
monoclonal  antibodies.  There can be no assurance that the Company will be able
to obtain such licenses in the territories where it proposes commercialization.

   
     The  Company  is aware that  third-party  patents  have been  issued in the
United States and Europe covering anti-idiotypic antibodies and/or their use for
the treatment of tumors. Such patents, if valid, could be construed to cover the
Company's BEC2 monoclonal antibody and certain uses thereof in the United States
and most of  Europe.  Merck,  the  Company's  licensee  of BEC2  worldwide,  has
informed the Company that it has obtained a non-exclusive,  worldwide license to
such patent in order to market BEC2 in its territory.  No assurance can be given
that such license  would be available to the Company in other parts of the world
on commercially acceptable terms, if at all.
    

     The   Company   maintains   a   proprietary   position   with   respect  to
anti-angiogenic  therapeutics,  as  well  as  therapeutic  methods  of  treating
angiogenic  disease,  through  patents  and  patent  applications  filed  by the
Company.  The Company is aware that third parties have filed patent applications
that  could   affect  the   ability  of  the   Company  to   commercialize   its
anti-angiogenic therapeutics or therapeutic treatments.


                                       13
<PAGE>

      The Company's  proprietary  position with respect to its IL-6m is based on
patents and patent  applications  filed by the Company.  The Company is aware of
patents  issued  to a third  party in the  United  States  and  Europe  covering
cysteine-depleted  proteins.  Patent  applications by this third party also have
been filed in other  countries.  The issued  U.S.  and  European  patents may be
construed to cover use of the  Company's  IL-6m in the United  States and Europe
and, assuming such patents are valid,  enforceable and infringed,  could require
the  Company to obtain a license to the  patents in order to  commercialize  the
Company's  product in the U.S.  and Europe,  including  Great  Britain,  France,
Germany,  Sweden and Italy.  Similar licenses might have to be obtained in order
to market the product in other  countries if similar patents are issued in those
jurisdictions.

     The Company is also aware that United  States  patents  have been issued to
third  parties  relating to a general  process for  purifying  proteins that the
Company  may  use in  producing  its  IL-6m  and to the  use of  IL-6  to  treat
thrombocytopenia.  The Company may be required to or decide to seek a license to
some or all of these patents.

   
     In  addition,  the  Company  is aware of  third-party  patents  for  native
recombinant  IL-6 and  methods  for its  production.  The  Company is aware of a
European patent for the DNA encoding for human  recombinant IL-6 and methods for
its production,  which has been  exclusively  licensed on a worldwide basis to a
pharmaceutical company. The Company has entered into a settlement agreement with
the pharmaceutical  company whereby the pharmaceutical company has agreed not to
enforce its patent  against the Company  based on the Company's use of its IL-6m
patent or patent applications.
    

     The Company is also aware of U.S.  patents  that cover  various  aspects of
IL-6. The U.S.  patents are licensed to the same  pharmaceutical  company as the
European patent  mentioned  above.  They may be construed to cover the Company's
IL-6m.

   
     The Company is aware that third parties have filed patent  applications  in
areas  that  could  affect  the  ability  of the  Company  or its  licensee  for
diagnostics,  Abbott, to commercialize the Company's diagnostic products.  These
areas could include target  amplification  technology  and signal  amplification
technology.  Third  party  patents  have  already  issued in the field of target
amplification such as polymerase chain reaction technology (also known as PCR).
    

     There has been  significant  litigation in the  biopharmaceutical  industry
regarding  patents and other  proprietary  rights.  Such litigation has consumed
substantial  resources for the parties involved.  If the Company became involved
in similar  litigation  regarding its intellectual  property rights, the cost of
such litigation could be substantial and could have a material adverse effect on
the Company.

     Certain  proprietary trade secrets and unpatented know-how are important to
the Company in conducting its research and development activities.  There can be
no  assurance  that  others may not  independently  develop  the same or similar
technologies.  Although the Company has taken  steps,  including  entering  into
confidentiality  agreements with its employees and third parties, to 


                                       14
<PAGE>

protect its trade secrets and unpatented know-how, third parties nonetheless may
gain access to such information.

     Reliance on and Attraction and Retention of Key Personnel and  Consultants.
The  Company's  ability  to  successfully  develop  marketable  products  and to
maintain a  competitive  position  will  depend in large part on its  ability to
attract and retain highly qualified  scientific and management  personnel and to
develop and  maintain  relationships  with  leading  research  institutions  and
consultants.  The Company is highly dependent upon the principal  members of its
management, scientific staff and Scientific Advisory Board. Competition for such
personnel and  relationships is intense,  and there can be no assurance that the
Company will be able to continue to attract and retain such personnel.

     Technological   Change   and  Risk  of   Obsolescence;   Competition.   The
biopharmaceutical  industry  is subject to rapid and  significant  technological
change. The Company has numerous competitors, including major pharmaceutical and
chemical  companies,  specialized  biotechnology  firms,  universities and other
research institutions.  These competitors may succeed in developing technologies
and products that are more effective  than any which are being  developed by the
Company or which would render the Company's technology and products obsolete and
non-competitive.  Many of these competitors have substantially greater financial
and technical  resources and  production  and  marketing  capabilities  than the
Company.  In addition,  many of the  Company's  competitors  have  significantly
greater  experience than the Company in pre-clinical  testing and human clinical
trials of new or improved pharmaceutical products and in obtaining Food and Drug
Administration  ("FDA") and other  regulatory  approvals  on products for use in
health  care.  The Company is aware of various  products  under  development  or
manufactured  by  competitors  that are used for the  prevention,  diagnosis  or
treatment of certain diseases the Company has targeted for product  development,
some of which use therapeutic  approaches that compete  directly with certain of
the  Company's  product  candidates.  The  Company  has  limited  experience  in
conducting and managing  pre-clinical testing necessary to enter clinical trials
required to obtain government approvals and has limited experience in conducting
clinical trials. Accordingly, the Company's competitors may succeed in obtaining
FDA approval for products more rapidly than the Company,  which could  adversely
affect the Company's ability to further develop and market its products.  If the
Company commences significant  commercial sales of its products, it will also be
competing with respect to manufacturing  efficiency and marketing  capabilities,
areas in which the Company has limited or no experience.

   
     Extensive  Government  Regulation.   Research,   pre-clinical  development,
clinical  trials  and  the   manufacturing  and  marketing  of  therapeutic  and
diagnostic  products  under  development by the Company are subject to extensive
and rigorous  regulation by  governmental  authorities  in the United States and
other countries. Clinical trials and the manufacturing and marketing of products
will be subject to the testing and approval  processes of the FDA and comparable
foreign  regulatory   authorities.   The  process  of  obtaining  such  required
regulatory  approvals for the types of products under development by the Company
usually  takes  many  years  and is  expensive.  Development  of a new  biologic
therapeutic  or vaccine  product may take,  from  initiation of clinical  trials
until  FDA  approval,  on  average  five to ten  years or  more,  while in vitro
diagnostics  may take  approximately  two to six years or more  depending on the
requirements of the approval
    


                                       15
<PAGE>

process or clinical  data  requirements.  If the FDA requests  additional  data,
these time periods can be  substantially  increased.  Even after such additional
data are  submitted,  there can be no assurance of obtaining  FDA  approval.  In
addition,  product approvals may be withdrawn or limited for noncompliance  with
regulatory  standards or the occurrence of unforeseen problems following initial
marketing.  The Company has not sought or received  regulatory  approval for the
commercial  sale of any of its  products or for any  manufacturing  processes or
facilities.  The Company and its licensees may encounter  significant  delays or
excessive costs in their  respective  efforts to secure  necessary  approvals or
licenses.  Future federal, state, local or foreign legislative or administrative
acts could also  prevent or delay  regulatory  approval of the  Company's or its
licensees'  products.  There  can  be no  assurance  that  the  Company  or  its
collaborative  partners  will be able to  obtain  the  necessary  approvals  for
clinical testing,  manufacturing or marketing of the Company's  products or that
the  clinical  data they  obtain  in  clinical  studies  will be  sufficient  to
establish the safety and  effectiveness  of the  products.  Failure to obtain or
maintain requisite  governmental approvals or failure to obtain approvals of the
clinical  intended  uses  requested,  could delay or preclude the Company or its
licensees from further  developing  particular  products or from marketing their
products or could limit the  commercial  use of the  products and thereby have a
material adverse effect on the Company's liquidity and financial condition.

   
     Product Liability  Exposure.  The use of the Company's  product  candidates
during  testing or after  approval  entails an inherent risk of adverse  effects
which could  expose the  Company to product  liability  claims.  There can be no
assurance  that the  Company  would have  sufficient  resources  to satisfy  any
liability   resulting  from  these  claims.  The  Company  endeavors  to  obtain
indemnification  by its  corporate  partners  against  certain  of such  claims.
However,  there can be no assurance  that such  parties will honor,  or have the
financial  resources  to honor,  such  obligations.  The Company  currently  has
product  liability  insurance for products in pre-clinical and clinical testing.
There  can be no  assurance  that such  coverage  will be  adequate  in scope to
protect the Company in the event of a successful product liability claim.
    

     Hazardous  Materials;  Environmental  Matters.  The Company's  research and
development  activities  involve  the  controlled  use of  hazardous  materials,
chemicals,  viruses and various radioactive compounds. The Company is subject to
federal,  state and local laws and regulations  governing the use,  manufacture,
storage,  handling and disposal of such  materials and certain  waste  products.
Although  the Company  believes  that its safety  procedures  for  handling  and
disposing of such  materials  comply with the standards  prescribed by such laws
and  regulations,  the risk of  accidental  contamination  or injury  from these
materials cannot be completely eliminated. In the event of such an accident, the
Company could be held liable for any damages that result, and any such liability
could exceed the resources of the Company.  The Company may be required to incur
significant  costs to comply  with  environmental  laws and  regulations  in the
future.  The  Company's  operations,  business  or assets may be  materially  or
adversely affected by current or future environmental laws or regulations.

     Uncertainty of Health Care Reimbursement and Related Matters. The Company's
ability to earn  sufficient  returns on its  products  may depend in part on the
extent  to which  reimbursement  for the  costs  of such  products  and  related
treatments will be available from government health administration  authorities,
private health coverage insurers and other 


                                       16
<PAGE>

organizations. If purchasers or users of the Company's products are not entitled
to adequate  reimbursement for the cost of using such products,  they may forego
or  reduce  such use.  Significant  uncertainty  exists as to the  reimbursement
status of newly  approved  health care  products,  and there can be no assurance
that adequate third-party coverage will be available.

   
     Possible  Volatility of Stock Price. The Company believes that factors such
as the status of its products in  development,  announcements  of new  products,
formation or  termination  of corporate  alliances,  other  developments  by the
Company,  its competitors or the FDA,  determinations  in connection with patent
applications  of the Company or others and  variations  in  quarterly  operating
results  could  cause  the  market  price  for the  Common  Stock  to  fluctuate
substantially.  In addition,  the stock market has experienced extreme price and
volume  fluctuations that have  particularly  affected the market price for many
high  technology  and  healthcare-related  companies  and that have  often  been
unrelated to the operating  performance of these  companies.  These broad market
fluctuations may adversely affect the market price of the Common Stock.
    

   
     Limitations on Net Operating Loss Carryforwards.  At December 31, 1996, the
Company had net operating loss  carryforwards for federal income tax purposes of
approximately  $96 million which expire at various dates from 2000 through 2011.
Pursuant to Section 382 of the Internal  Revenue Code of 1986,  as amended,  the
annual  utilization  of the Company's net operating  loss  carryforwards  may be
limited if the Company experiences a change in ownership of more than 50% within
a three-year  period.  The Company  believes that one or more of such  ownership
changes  may  have  occurred   since  1986.   Therefore,   the  Company  may  be
significantly  limited in using its tax net operating loss carryforwards arising
before such ownership change(s) to offset future taxable income.
    

     Dividend  Policy  and  Restrictions.  The  Company  has never paid any cash
dividends on its Common  Stock.  The Board of Directors  will  determine  future
dividend  policy  based  on  the  Company's  results  of  operations,  financial
condition,  capital requirements and other  circumstances.  The Company does not
anticipate  that any  dividends  will be  declared  on its  Common  Stock in the
foreseeable  future.  Except as may be utilized to pay the dividends  payable on
the  Company's  Series A Preferred  Stock,  any  earnings  which the Company may
realize will be retained to finance the growth of the Company. In addition,  the
terms of the Series A Preferred Stock restrict the payment of dividends on other
classes and series of stock.


                                       17
<PAGE>

                                 USE OF PROCEEDS

   
     The  Company  will not  receive  any  proceeds  from the sale of the Shares
offered herein by the Selling Stockholder.  If all of the Options are exercised,
the Company will  receive  estimated  proceeds of  approximately  $506,250.  The
Company  anticipates  utilizing  any proceeds  received from the exercise of the
Options (i) to continue to fund and expand its research and development programs
and (ii) for general corporate purposes, including working capital. There can be
no assurance that any of the Options will be exercised.
    

                               SELLING STOCKHOLDER

Stock Ownership

   
     The table below sets forth as of the date of this Prospectus, the number of
shares of Common Stock (i) owned beneficially by the Selling  Stockholder;  (ii)
being offered by the Selling Stockholder  pursuant to this Prospectus;  (iii) to
be  owned  beneficially  by the  Selling  Stockholder  after  completion  of the
offering,  assuming  that all of the Options are exercised and all of the Shares
are sold and (iv) the  percentage to be owned by the Selling  Stockholder  after
completion  of the  offering.  For  the  purposes  of  this  table  the  Selling
Stockholder is deemed to own  beneficially the shares of Common Stock underlying
the Options.

     In  January  1992,  the  Company  participated  in the  founding  of  Cadus
Pharmaceutical  Corporation ("Cadus") with scientists from Princeton University.
The Company  supported the initial growth and  development  of Cadus,  and as of
December 31, 1993 owned  approximately 28% of Cadus' common and preferred stock.
In December 1994, the Company completed the sale of one-half of its Cadus shares
for proceeds equaling $3 million to the Selling Stockholder.  In April 1995, the
Company  completed the sale of the  remaining  one-half of its shares of capital
stock of Cadus for $3 million to the  Selling  Stockholder.  The  Company  had a
right to  repurchase  all such shares of Cadus anytime up until October 27, 1996
for $5.25 per share which it did not exercise.  In exchange for such right,  the
Company granted the Selling  Stockholder the Options.  One Option is to purchase
150,000  shares at a price of $2.00  per  share,  subject  to  adjustment  under
certain  circumstances,  and the other Option is to purchase 300,000 shares at a
price of $0.6875 per share,  subject to adjustment under certain  circumstances.
Both Options  became  exercisable on April 27, 1995 and will expire on April 27,
2000.  Dr.  Samuel D. Waksal was the Chairman of the board of directors of Cadus
until July 1996 and continued to serve on the board as a director until November
1997.
    

                                       18
<PAGE>


                           SELLING STOCKHOLDER'S TABLE

                                                                   Percentage of
                                                   Number of        Outstanding 
                     Number of     Number of      Shares to be      Shares to be
                      Shares        Shares        Owned after       Owned after
Selling            Beneficially     Offered      Completion of     Completion of
Stockholder           Owned         Hereby          Offering        the Offering
- -----------           -----         ------          --------        ------------
                                                                  
High River Limited    450,000      450,000(1)          0                 0
Partnership                                                       
                                                               
(1) Consists of the Shares being offered pursuant to this Prospectus,  which are
issuable upon the exercise of the Options.
    

                              PLAN OF DISTRIBUTION

   

     Shares of Common Stock  issuable  upon  exercise of the Options may be sold
pursuant to this Prospectus by the Selling Stockholder. These sales may occur in
privately  negotiated  transactions  or in the  over-the-counter  market through
brokers and dealers as agents or to brokers  and dealers as  principals  who may
receive  compensation in the form of discounts,  concessions or commissions from
the Selling  Stockholder or from the purchasers of the Common Stock for whom the
broker-dealers may act as agent or to whom they may sell as principal,  or both.
After the passage of the requisite  period of time, the Selling  Stockholder may
also sell the Shares  pursuant  to Rule 144 under the 1933 Act.  The Company has
been advised by the Selling  Stockholder  that it has not made any  arrangements
relating to the distribution of the Shares.  In effecting sales,  broker-dealers
engaged by the  Selling  Stockholder  may arrange  for other  broker-dealers  to
participate.  Broker-dealers  will receive  commissions  or  discounts  from the
Selling Stockholder in amounts to be negotiated immediately prior to the sale.

     Upon  being  notified  by  the  Selling   Stockholder   that  any  material
arrangement  (other  than a  customary  brokerage  account  agreement)  has been
entered  into  with a broker or  dealer  for the sale of Shares  through a block
trade, purchase by a broker or dealer, or similar transaction,  the Company will
file a  supplemented  Prospectus  pursuant  to Rule  424(c)  under  the 1933 Act
disclosing  (a) the name of each such  broker-dealer,  (b) the  number of shares
involved, (c) the price at which such shares were sold, (d) the commissions paid
or discounts or concessions allowed to such broker-dealer(s), (e) if applicable,
that such  broker-dealer(s)  did not  conduct  any  investigation  to verify the
information  set  out  or  incorporated  by  reference  in  the  Prospectus,  as
supplemented, and (f) any other facts material to the transaction.
    

     The Selling  Stockholder and any  broker-dealers  who execute sales for the
Selling Stockholder may be deemed to be "underwriters" within the meaning of the
1933 Act by virtue of the number of shares of Common  Stock to be sold or resold
by such  persons or  entities  or the manner of sale  thereof,  or both.  If the
Selling  Stockholder or any broker-dealer or other holders were determined to be
underwriters,  any discounts,  concessions or commissions received by 


                                       19
<PAGE>

them or by brokers or dealers acting on their behalf and any profits received by
them on the resale of their shares of Common Stock might be deemed  underwriting
discounts and commissions under the 1933 Act.


     The Selling Stockholder has represented to the Company that any purchase or
sale  of the  Common  Stock  by it  will  be in  compliance  with  Regulation  M
("Regulation M") promulgated under the Exchange Act. In general,  Rule 102 under
Regulation M prohibits any person connected with a distribution of the Company's
Common Stock (the  "Distribution")  from directly or indirectly  bidding for, or
purchasing  for any account in which he has a  beneficial  interest,  any Common
Stock or any right to purchase  Common  Stock,  for a period of one business day
prior to and subsequent to completion of his  participation  in the Distribution
(the "Distribution Period").


     During the  Distribution  Period,  Rule 104 ("Rule 104") under Regulation M
prohibits  the  Selling   Stockholder  and  any  other  person  engaged  in  the
Distribution from engaging in any stabilizing bid or purchasing the Common Stock
except for the purpose of  preventing  or retarding a decline in the open market
price of the Common Stock. No such person may effect any stabilizing transaction
to facilitate  any offering at the market.  Inasmuch as the Selling  Stockholder
will be  reoffering  and  reselling  the Common  Stock at the  market,  Rule 104
prohibits it from effecting any stabilizing transaction in contravention of Rule
104 with respect to the Common Stock.

                                  LEGAL MATTERS

   
     Certain legal  matters in connection  with the sale of the Shares have been
passed upon for the Company by the Law Offices of Brian W Pusch,  New York,  New
York. Brian Pusch owns 700 shares of Common Stock.
    

                                     EXPERTS

     The financial statements of ImClone Systems Incorporated as of December 31,
1996 and 1995, and for each of the years in the three-year period ended December
31, 1996,  have been  incorporated by reference  herein and in the  Registration
Statement  in reliance  upon the report of KPMG Peat  Marwick  LLP,  independent
certified  public  accountants,  incorporated  by reference  herein and upon the
authority of said firm as experts in accounting and auditing.


                                       20
<PAGE>


                                     PART II

Information Not Required in Prospectus

Item 14: Other expenses of Issuance and Distribution

     The  following  table sets  forth all  expenses  payable by the  Company in
connection with the sale of the Shares:

   
         SEC registration fee                                      $930
         Blue Sky fees and expenses*                               $200
         Legal fees and expenses*                                $5,000
         Accounting fees and expenses*                           $4,000
         Miscellaneous*                                          $3,870
                                                               --------
         Total*                                                 $14,000
    

- -------------------
*Estimated

Item 15.  Indemnification of Directors and Officers

     The Company's Certificate of Incorporation and Amended and Restated By-laws
set forth the  extent to which  officers  or  directors  of the  Company  may be
indemnified  against any liabilities which they may incur. The general effect of
such charter and by-law  provision is that any person made a party to an action,
suit or proceeding by reason of the fact that he is or was a director or officer
of the Company, or of another corporation or other enterprise which he served as
such at the request of the Company,  shall be indemnified by the Company against
expenses  (including  attorneys'  fees,  judgments,  fines and  amounts  paid in
settlement)  reasonably  incurred by him in connection with such action, suit or
proceeding,  to the  full  extent  permitted  under  the  laws of the  State  of
Delaware.  Authority  is  given  to  the  Board  of  Directors  to  extend  such
indemnification to employees and other agents of the Company as well.

     The general effect of the indemnification  provisions  contained in Section
145 of the Delaware General Corporation Law is as follows: A director or officer
who, by reason of such  directorship or officership,  is involved in any action,
suit or proceeding  (other than an action by or in the right of the corporation)
may be indemnified by the corporation  against  expenses  (including  attorneys'
fees),  judgments,  fines and amounts paid in settlement actually and reasonably
incurred by him in connection  with such action,  suit or proceeding if he acted
in good faith and in a manner he reasonably  believed to be in or not opposed to
the best interests of the corporation,  and, with respect to any criminal action
or proceeding, had no reasonable cause to believe that his conduct was unlawful.
A director or officer who, by reason of such  directorship  or  officership,  is
involved  in any  action  or suit by or in the right of the  corporation  may be
indemnified by the corporation  against  expenses  (including  attorneys'  fees)
actually and


                                      II-1
<PAGE>

reasonably  incurred by him in connection with the defense or settlement of such
action or suit if he acted in good faith and in a manner he reasonably  believed
to be in or not opposed to the best interests of the corporation, except that no
indemnification may be made in respect of any claim, issue or matter as to which
he shall have been adjudged to be liable to the  corporation  unless and only to
the  extent  that  a  court  of  appropriate  jurisdiction  shall  approve  such
indemnification.

     The Company's  Certificate of  Incorporation  provides that, to the maximum
extent permitted under the Delaware  General  Corporation Law, a director of the
Company  shall  not  be  personally  liable  to  the  Company  or to  any of its
stockholders  for monetary damages for breach of fiduciary duty as a director of
the Company. Section 102(b)(7) of the Delaware General Corporation Law permits a
corporation  to include in its  certificate  of  incorporation  a provision that
eliminates or limits the personal  liability of a director to the corporation or
its  stockholders  for  monetary  damages  for  breach  of  fiduciary  duty as a
director,  provided  that  such  provision  shall  not  eliminate  or limit  the
liability of a director (i) for any breach of the director's  duty of loyalty to
the  corporation  or its  stockholders,  (ii) for acts or omissions  not in good
faith or which involve  intentional  misconduct  or a knowing  violation of law,
(iii) under Section 174 of the Delaware General  Corporation Law or (iv) for any
transaction from which the director derived an improper personal benefit.

     The  Company  maintains  $5  million  in  insurance  for its  officers  and
directors in connection  with claims  against them in their capacity as officers
or directors.

Item 16. Exhibits

         5    - Opinion of Law Offices of Brian W Pusch*

         23.1 - Consent of Law Offices of Brian W Pusch (included in Exhibit 5)*

         23.2 - Consent of KPMG Peat Marwick LLP

   
         24   - Power of Attorney (included in signatures)
    

*  Previously filed as an exhibit hereto.

Item 17.  Undertakings

     (a) The undersigned Registrant hereby undertakes:

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

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

          (ii) To reflect in the  prospectus  any facts or events  arising after
     the  effective  date of this  Registration  Statement  (or the most  recent
     post-effective amendment thereof) which,  


                                      II-2
<PAGE>

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

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

provided,  however, that paragraphs (a)(l)(i) and (a)(1)(ii) do not apply if the
registration  statement  is on  Form  S-3,  Form  S-8,  or  Form  F-3,  and  the
information  required  to be  included in a  post-effective  amendment  by those
paragraphs  is  contained  in periodic  reports  filed with or  furnished to the
Commission by the Registrant  pursuant to Section 13 or l5 (d) of the Securities
Exchange Act of 1934 that are  incorporated  by  reference in this  Registration
Statement.

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

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

     (b) The  undersigned  Registrant  hereby  undertakes  that, for purposes of
determining  any liability  under the Securities Act of 1933, each filing of the
Registrant's  annual report pursuant to Section 13(a) or l3(d) of the Securities
Exchange Act of 1934 (and, where applicable,  each filing of an employee benefit
plan's  annual  report  pursuant to Section  l5(d) of the Exchange  Act) that is
incorporated  by reference in the  Registration  Statement shall be deemed to be
new registration  statement  relating to the securities  offered herein, and the
offering of such  securities at that time shall be deemed to be the initial bona
fide offering thereof.

     (c) Insofar as indemnification for liabilities arising under the Securities
Act of 1933 may be permitted to directors,  officers and controlling  persons of
the  Registrant  pursuant  to  the  foregoing  provisions,   or  otherwise,  the
Registrant  has been advised that in the opinion of the  Securities and Exchange
Commission such indemnification is against public policy as expressed in the Act
and is therefore,  unenforceable.  In the event that a claim for indemnification
against  such  liabilities  (other  than the  payment by the issuer 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


                                      II-3
<PAGE>

has been  settled by  controlling  precedent,  submit to a court of  appropriate
jurisdiction the question whether such  indemnification  by it is against public
policy as expressed in the Act and will be governed by the final adjudication of
such issue.

     (i) 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 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-4

<PAGE>

                                   SIGNATURES

     Pursuant to the  requirements of the Securities Act of 1933, the Registrant
has reasonable  grounds to believe that 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 New York, State of New
York, on the 9th day of February, 1998.

                                       IMCLONE SYSTEMS INCORPORATED       
                                      
                                       By: /s/ Samuel D. Waksal
                                           ---------------------------------- 
                                           Samuel D. Waksal
                                           President and Chief Executive Officer
                    

                                      II-5

<PAGE>

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

   
Signature                                Title                       Date

                  *                             
- --------------------------------  Chairman of the Board         February 9, 1998
(Robert F. Goldhammer)            and Director

                                  
    

/s/ Samuel D. Waksal              President, Chief Executive    February 9, 1998
- --------------------------------  Officer and Director
(Samuel D. Waksal)                (Principal Executive Officer)

   
                  *               Executive Vice President,     February 9, 1998
- --------------------------------  Chief Operating Officer
(Harlan W. Waksal)                and Director
    

   
                  *               
- --------------------------------  Vice President, Finance and   February 9, 1998
(Carl S. Goldfischer)             and Chief Financial Officer
                                  (Principal Financial Officer)
     
                                  

                  *               Director                      February 9, 1998
- --------------------------------
(Richard Barth)

                  *               Director                      February 9, 1998
- --------------------------------
(Jean Carvais)

                  *               Director                      February 9, 1998
- --------------------------------
(Vincent T. DeVita, Jr.)

                  *               Director                      February 9, 1998
- --------------------------------
(David M. Kies)

                  *               Director                      February 9, 1998
- --------------------------------
(Paul B. Kopperl)

________________________________  Director                      February _, 1998
(John Mendelsohn)

                  *               Director                      February 9, 1998
- --------------------------------
(William R. Miller)


*/s/ John B. Landes
- --------------------------------------
By: John B. Landes as attorney-in-fact


                                      II-6
<PAGE>
   
                                  EXHIBIT INDEX

Exhibit No.                Exhibit
- -----------                -------
    

23.2                       Consent of KPMG Peat Marwick LLP

<PAGE>

                          INDEPENDENT AUDITORS' CONSENT

The Board of Directors
ImClone System Incorporated

   
     We  consent  to the  use  of our  reports  incorporated  herein  and to the
reference to our firm under the heading "Experts" in the prospectus.
    

February 9, 1998                                     /s/ KPMG Peat Marwick LLP
                                                     -------------------------
                                                         KPMG PEAT MARWICK LLP



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