IMCLONE SYSTEMS INC/DE
S-3, 1997-10-30
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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              As filed with the Securities and Exchange Commission
                               on October 30, 1997

                            Registration No. 333-___

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

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

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

                                    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.[ ]
<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------------------------
                                               Proposed             Proposed           
        Title of             Amount            Maximum              Maximum              Amount of 
         Shares              to be          Offering Price         Aggregate           Registration
    to be Registered       Registered       Per Share (1)      Offering Price (1)           Fee    
- ----------------------------------------------------------------------------------------------------
<S>                        <C>                  <C>                <C>                      <C> 
    Common Stock,          450,000 (2)          $6.82              $3,069,000               $930
    $.001 par value
- ----------------------------------------------------------------------------------------------------
</TABLE>

(1)  Estimated  solely  for the  purpose of  calculating  the  registration  fee
     pursuant  to Rule  457(c),  based upon the average of the high and low sale
     prices for the Common  Stock on October  27, 1997 as reported by the Nasdaq
     National Market.

(2)  To  be  offered  and  sold  by  a  Selling  Stockholder  upon  exercise  of
     outstanding  Options  (the  "Options").  Pursuant  to Rule  416  under  the
     Securities   Act,   this   Registration   Statement   also  relates  to  an
     indeterminate  number of  additional  shares of Common  Stock  which may be
     issuable upon exercise of the Options to prevent  dilution  resulting  from
     stock splits, stock dividends and similar transactions.

     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 Section 8(a), may
determine.


                                       2
<PAGE>

                 SUBJECT TO COMPLETION - DATED October 30, 1997

     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 October 28, 1997 the closing  sale price for the
Common Stock as reported by the Nasdaq National Market was $6.375.

     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 $12,000.  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 October __, 1997


                                       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...............................................................16
SELLING STOCKHOLDER...........................................................16
PLAN OF DISTRIBUTION..........................................................17
LEGAL MATTERS.................................................................19
EXPERTS.......................................................................19
                                                                    
                                                                  
                                      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 April 14,  1997,  June 3, 1997,  February  25, 1997,
February 25, 1997 and October 15, 1997 (iii) the Company's  Quarterly Reports on
Form 10-Q for the fiscal  quarters  ended March 31, 1997 and June 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


                                       1
<PAGE>

amendment  to the  Registration  Statement  which  indicates  that all shares of
Common Stock 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.
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
1996. 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.
Three  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.  ImClone expects to initiate
Phase II/III  studies to evaluate the  potential of C225 in various tumor types.
Two of these tumor  targets  will  include  renal cell cancer where C225 will be
used alone,  and head and neck  cancers  where C225 will be used in  combination
with  chemotherapy.  The Company  produces  C225 for its clinical  trials at its
manufacturing facility in Somerset, New Jersey.

     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


                                       3
<PAGE>

in Phase I clinical trials at  Sloan-Kettering  against certain forms of cancer,
including  small-cell 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.  The Company has granted Merck KGaA (formerly E.
Merck) ("Merck"), a German-based  pharmaceutical  company, rights to manufacture
and market  BEC2  worldwide,  except in North  America,  in return for  research
support,  potential  milestone fees and royalties on future sales, if any. As of
June 30, 1997, the Company had earned in fiscal 1997 from its collaboration with
Merck  $1,500,000  in milestone  payments,  and $417,000 of research and support
payments which is the first of eight quarterly  payments  totaling $4.7 million.
ImClone  expects to initiate a Phase III  multinational  clinical trial for BEC2
for use in treatment in small cell lung  carcinoma in the fourth quarter of this
year.

     Interleukin-6  Mutein  ("IL-6m").  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.

     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
goals of the  FLK-2  monoclonal  antibody  program  are 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 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 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.  The  $1,000,000  in
milestone  payments and $75,000 in royalty payments  covering 1995 and 1996 were
received in 1997.

     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 Somerset, New Jersey manufacturing  facility. Of the Company's 108 full-time
personnel  on October 15,  1997,  47 were  employed in its product  development,
clinical and manufacturing  programs,  32 in research and 29 in  administration.
The  Company's  staff  includes 15 persons with Ph.D.  degrees and two with M.D.
degrees.

     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


                                       5
<PAGE>

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 Somerset, 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 and  supporting  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  October  15,  1997  the  Company  had
                                   24,197,830    shares    of    Common    Stock
                                   outstanding. Assuming that all of the Options
                                   are  exercised  and no other shares of Common
                                   Stock are issued  subsequent  to October  15,
                                   1997,  the  Company  would  have   24,647,830
                                   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 June 30,
1997, the Company had an accumulated deficit of approximately $109 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,  the  entire
$561,000 of  outstanding  debt to Pharmacia is payable  ratably  throughout  the
period ending February 1998 and $2,113,000 of the Industrial Development Revenue
Bonds (the "1986 Bonds") issued by the New York  Industrial  Development  Agency
("NYIDA") on behalf of the Company  becomes due in December 1997. The Company is
currently  negotiating  the  extension  of the  due  date  for the  1986  Bonds.
Additionally,  the  1986  Bonds  may,  and  the  $2,200,000  of  the  Industrial
Development  Revenue  Bonds  issued by 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 due date of the 1986 Bonds and
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 twenty months.  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 1986  Bonds or the  Lease  will be
extended.  Upon  exhaustion of its capital  resources,  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.

     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
may seek to enter into a significant strategic partnership with a pharmaceutical
company  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.

     Dilution.  Warrants to purchase  2,414,145  shares of the Company's  Common
Stock (which includes 1,431,955 warrants held by directors,  officers, employees
and consultants),  at an average exercise price of approximately $2.71 per share
(subject to adjustment)  and stock options to purchase  2,080,395  shares of the
Company's  Common Stock (which includes  1,630,395  options granted to employees
and  consultants  under the Company's  stock option plans and the Options) at an
average exercise price of approximately  $6.21 per share (subject to adjustment)
were  outstanding  as of October  15,  1997.  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


                                       9
<PAGE>

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.

     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
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.

     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,
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


                                       10
<PAGE>

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 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 presently uncertain.


                                       11
<PAGE>

     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,  except in
North  America,  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.

     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


                                       12
<PAGE>

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  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 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


                                       13
<PAGE>

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
noncompetitive.  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 required FDA 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 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


                                       14
<PAGE>

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 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.


                                       15
<PAGE>

     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.  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.

                                 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 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


                                       16
<PAGE>

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 continues to serve on the board as a director.

     In connection  with the  registration  of the Shares  offered  hereby,  the
Company will supply prospectuses to the Selling Stockholder.

                           SELLING STOCKHOLDER'S TABLE

                                                                   Percentage of
                                                    Number of       Outstanding
                  Number of                        Shares to be     Shares to be
                   Shares                          Owned after     Owned after
Selling         Beneficially   Number of Shares   Completion of   Completion of
Stockholder        Owned        Offered Hereby    the Offering     the Offering
- --------------------------------------------------------------------------------
High River        450,000         450,000(1)           0               0
Limited
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


                                       17
<PAGE>

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 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.


                                       18
<PAGE>

                                  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 100 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.


                                       19
<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*                                      $ 1,870
                                                             -------
         Total*                                              $12,000

- -------
*Estimated

Item 15. Indemnification of Directors and Officers

     The Company's  Certificate of Incorporation  sets 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  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.  The  Company's  Certificate  of
Incorporation  gives  the  Board of  Directors  the  authority  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)


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,  individually or in the aggregate,
     represent  a  fundamental  change  in the  information  set  forth  in this
     Registration Statement. Notwithstanding the foregoing, any increase or


                                      II-2
<PAGE>

     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
has been  settled by  controlling  precedent,  submit to a court of  appropriate
jurisdiction the question


                                      II-3
<PAGE>

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 29th day of October, 1997.

                                       IMCLONE SYSTEMS INCORPORATED

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


                                      II-5
<PAGE>

                                POWER OF ATTORNEY

     Each person whose  individual  signature  appears  below hereby  authorizes
Samuel D. Waksal,  Harlan W. Waksal and John B. Landes,  or any one of them,  to
execute  in the name of each  such  person  and to file  any amen  dment to this
Registration  Statement and appoints Samuel D. Waksal, Harlan W. Waksal and John
B.  Landes,  or any one of  them,  as  attorney-in-fact  to  sign on his  behalf
individually  and in each  capacity  stated below and to file any  amendments to
this Registration Statement, including any and all post-effective amendments.

     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
                                                          
/s/Robert F. Goldhammer           Chairman of the Board         October 29, 1997
- -----------------------------     and Director
(Robert F. Goldhammer)            
                                  
/s/ Samuel D. Waksal              President, Chief Executive    October 29, 1997
- -----------------------------     Officer and Director
(Samuel D. Waksal)                (Principal Executive Officer)
                                                     
/s/ Harlan W. Waksal              Executive Vice President,     October 29, 1997
- -----------------------------     Chief Operating Officer
(Harlan W. Waksal)                and Director

/s/ Carl S. Goldfischer           Vice President, Finance and   October 29, 1997
- -----------------------------     and Chief Financial Officer
(Carl S. Goldfischer)             (Principal Financial Officer)

/s/ Richard Barth                 Director                      October 29, 1997
- -----------------------------
(Richard Barth)

/s/ Jean Carvais                  Director                      October 29, 1997
- -----------------------------
(Jean Carvais)

/s/ Vincent T. DeVita, Jr.        Director                      October 29, 1997
- -----------------------------
(Vincent T. DeVita, Jr.)

/s/ David M. Kies                 Director                      October 29, 1997
- -----------------------------
(David M. Kies)

/s/ Paul B. Kopperl               Director                      October 29, 1997
- -----------------------------
(Paul B. Kopperl)

/s/ William R. Miller             Director                      October 29, 1997
- -----------------------------
(William R. Miller)


                                      II-6
<PAGE>

                                  EXHIBIT INDEX

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

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



                                                                       Exhibit 5
                                 LAW OFFICES OF
                                  BRIAN W PUSCH
                                ATTORNEYS AT LAW

                                 PENTHOUSE SUITE
                               29 WEST 57TH STREET
                               NEW YORK, NY 10019
                            TELEPHONE (212) 980-0408
                            FACSIMILE (212) 980-7055

                                                   October 29, 1997

ImClone Systems Incorporated
180 Varick Street
New York, New York  10014

                          IMCLONE SYSTEMS INCORPORATED
                        Registration of 450,000 Shares of
                    Common Stock, par value $.001 per share,
                       on Form S-3 Registration Statement

Ladies and Gentlemen:

     We are  acting as  special  counsel  to  ImClone  Systems  Incorporated,  a
Delaware  corporation  (the  "Company"),  in  connection  with the filing by the
Company  with  the U.S.  Securities  and  Exchange  Commission  pursuant  to the
Securities  Act of 1933, as amended (the  "Securities  Act"),  of a Registration
Statement on Form S-3 (the "Registration  Statement")  pursuant to which 450,000
shares (the "Shares") of the Company's  Common Stock, par value $.001 per share,
may be offered and sold from time to time by High River Limited  Partnership,  a
Delaware  limited  partnership  (the  "Selling  Stockholder").  The  Shares  are
issuable  upon  exercise  of  options  granted  by the  Company  to the  Selling
Stockholder prior to the date hereof (the "Options").

     This opinion is being furnished pursuant to the requirements  applicable to
Item 16 of Part II of the Registration Statement.

     In connection  with this opinion,  we have examined and relied on originals
or copies,  certified  or  otherwise  identified  to our  satisfaction,  of such
corporate  records,  documents,  agreements or other instruments of the Company,
orders,   rulings  and   certificates   of  public   officials,   officers   and
representatives of the Company and such other persons,  have made investigations
of law,  and have  discussed  with  officers  and other  representatives  of the
Company


<PAGE>

such  questions of fact,  as we have deemed  proper and necessary as a basis for
the  opinions  hereinafter  expressed.  As to certain  questions of fact we have
relied, without independent  verification,  on information provided to us by the
Company.  We have assumed the  genuineness  of all  signatures  appearing on the
documents  furnished  to or  reviewed  by us and we have also  assumed  that any
person purporting to execute any document in a representative capacity is a duly
authorized  representative  of the person  for whom such  person  executed  such
document.

     Based upon and subject to the  foregoing,  we are of the  opinion  that the
Shares are duly  authorized  and (1) when the  provisions of the  securities and
blue sky laws of certain  jurisdictions  shall have been complied  with, and (2)
when the Shares,  certificates  for which shall have been duly  executed,  shall
have been delivered against payment of the consideration  therefor in accordance
with the  Options and such  consideration  is not less than the par value of the
Shares, the Shares will be validly issued,  fully paid and non-assessable  under
the laws of the State of Delaware.

     We are  admitted  to  practice  in the State of New York and we  express no
opinion herein  concerning any laws other than the laws of the State of New York
and the General Corporation Law of the State of Delaware.

     We hereby  consent  to the  filing of this  opinion  as an  exhibit  to the
Registration  Statement. In giving such consent, we do not thereby admit that we
are in the category of persons whose consent is required  under Section 7 of the
Securities Act.

                                                        Very truly yours,

                                                        /s/ Brian W Pusch
                                                        Brian W Pusch

BWP:jsm



                                                                    Exhibit 23.2
                          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.

October 29, 1997                                     /s/ KPMG Peat Marwick LLP
                                                     -------------------------
                                                     KPMG PEAT MARWICK LLP



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