IMMUNOMEDICS INC
S-3, 1998-12-30
IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES
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As filed with the Securities and Exchange Commission on December 30, 1998
Registration No. 333-_____


                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                   ----------


                                    FORM S-3

             REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933
                                  ------------

                               IMMUNOMEDICS, INC.
             (Exact name of registrant as specified in its charter)

                  Delaware                                61-1009366
         (State or other jurisdiction of               (I.R.S. Employer
         incorporation or organization)                Identification No.)

                                300 American Road
                         Morris Plains, New Jersey 07950
                                 (973) 605-8200
                   (Address, including zip code, and telephone
                         number, including area code, of
                    registrant's principal executive offices)
                                              
                                  ------------

                               Robert J. DeLuccia
                      President and Chief Executive Officer
                               Immunomedics, Inc.
                                300 American Road
                         Morris Plains, New Jersey 07950
                                 (973) 605-8200
 (Name, address, including zip code, and telephone number, including area code,
                              of agent for service)
                                                           
                                  ------------

                          Copies of all communications,
                          including all communications
                              sent to the agent for
                           service, should be sent to:
                            Michael D. Schwamm, Esq.
                             Warshaw Burstein Cohen
                             Schlesinger & Kuh, LLP
                                555 Fifth Avenue
                            New York, New York 10017
                                 (212) 984-7700

Approximate  date of commencement  of proposed sale to the public:  From time to
time after the effective date of this Registration Statement.

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:  [ ]

<PAGE>
<TABLE>
<CAPTION>

====================================================================================================================================
                         CALCULATION OF REGISTRATION FEE
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                              <C>                    <C>                          <C>                           <C>
    Title of Each Class of       Amount of Shares to        Proposed Maximum         Proposed Maximum Aggregate         Amount of
 Securities to be Registered        be Registered       Offering Price Per Share           Offering Price           Registration Fee
- ------------------------------------------------------------------------------------------------------------------------------------
Common Stock, $.01 par
   value per share(1)             10,000,000 Shares            $3.09375(2)                 $30,937,500(2)                $8,601
- ------------------------------------------------------------------------------------------------------------------------------------

</TABLE>

(1)      Consists  of  shares  of  common  stock  issuable  upon  conversion  of
         outstanding  shares  of  the  Company's  Series F Convertible Preferred
         Stock.

(2)      Pursuant to Rule 457(c),  the proposed maximum offering price per share
         and proposed maximum  aggregate  offering price have been calculated on
         the  basis  of the  average  of the high  and low  sale  prices  of the
         Company's  common  stock as reported on The Nasdaq  National  Market on
         December 24, 1998

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.

<PAGE>



The  information in this Prospectus is subject to completion and may be changed.
The selling  stockholders  may not sell these  securities until the registration
statement  filed with the  Securities  and  Exchange  Commission  (of which this
Prospectus  is a part) is  effective.  This  Prospectus  is not an offer to sell
these securities, and is not soliciting an offer to buy these securities, in any
state where such offer or sale is not permitted


PROSPECTUS                Subject to Completion,         dated December 29, 1998


                               IMMUNOMEDICS, INC.

                        10,000,000 Shares of Common Stock


THE COMPANY

Immunomedics.  Inc.
300 American Road
Morris Plains, New Jersey 07950
(973) 605-8200

THE SELLING STOCKHOLDERS

The selling  stockholders  are offering to sell shares of common stock that they
may acquire  upon  conversion  of shares of our Series F  Convertible  Preferred
Stock  that we  issued to them on  December  9, 1998  pursuant  to a  Securities
Purchase  Agreement.  Additional  information  concerning our agreement with the
selling  stockholders  is set forth  under  the  caption  "The  Company - Recent
Financing Arrangement."

TRADING SYMBOL

Nasdaq National Market -  "IMMU"

THE OFFERING

The selling  stockholders  may sell shares of our common stock from time to time
on the Nasdaq  National  Market at the  prevailing  market  price or in private,
negotiated  transactions.  The shares will be sold at prices  determined  by the
selling  stockholders.  We will not  receive any part of the  proceeds  from the
sale.  We are paying the expenses in  connection  with the  registration  of the
shares with the SEC.

A Purchase of Shares  Involves a High Degree of Risk. You Should Purchase Shares
Only If You Can Afford a Complete Loss of Your  Investment.  See "Risk  Factors"
Beginning on Page 9.

Neither  the  Securities  and  Exchange  Commission  nor  any  state  securities
commission  has approved or disapproved  these  securities or determined if this
Prospectus  is truthful or  complete.  Any  representation  to the contrary is a
criminal offense.

                                                               ___________, 1999


<PAGE>



                                TABLE OF CONTENTS

WHERE YOU CAN FIND MORE INFORMATION............................................3

THE COMPANY....................................................................4
    Description of Our Business................................................4
    Recent Financing Arrangement...............................................5

SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS. ............................7

RISK FACTORS...................................................................8
    History of Operating Losses................................................8
    Limited Number of Approved Products; Lack of Significant Product Revenues..8
    Uncertainty of Product Development.........................................8
    Unpredictability of Preclinical and Clinical Trials and Patient
    Enrollment ................................................................9
    Need for Additional Capital................................................9
    Limited Marketing and Sales Experience and Capability......................9
    Dependence on Third Parties for Distribution of Products..................10
    Limited Manufacturing Capability..........................................10
    Dependence on Fluids Produced in Mice ....................................10
    Dependence on The Center for Molecular Medicine and Immunology............10
    Potential Conflicts of Interest with The Center
    for Molecular Medicine and Immunology ....................................11
    Extensive Government Regulation...........................................11
    Uncertainty of Health Care Reimbursement..................................12
    Dependence on Key Personnel...............................................12
    Possible Inability to Successfully Compete................................12
    Impact of Rapid Technological Change......................................12
    Limited Protection of Intellectual Property Rights........................12
    Specific Patent Issues Involving CEA-Scan.................................13
    Product Liability.........................................................13
    Control by Existing Principal Stockholder.................................13
    Substantial Dilution; Potential for Issuance of Significant
    Number of Shares of Common Stock..........................................14
    Potential Adverse Impact on Market Price of Common Stock..................14
    Stock Price Volatility....................................................15
    Effect of Certain Anti-Takeover Provisions................................15
    Year 2000 Compliance......................................................15
    No Expectation that We will Pay Dividends.................................16

USE OF PROCEEDS...............................................................17

SELLING STOCKHOLDERS..........................................................18

PLAN OF DISTRIBUTION..........................................................20
    Manner of Sales; Broker-Dealer Compensation...............................20
    Filing of Supplement to Prospectus In Certain Instances...................20
    Certain Persons Deemed to be Underwriters.................................20
    Regulation M..............................................................20

LEGAL MATTERS.................................................................21

EXPERTS.......................................................................21


                                        2

<PAGE>



                       WHERE YOU CAN FIND MORE INFORMATION

         We file annual,  quarterly and special  reports,  proxy  statements and
other information with the SEC. You may read and copy any document which we file
at the SEC's  Public  Reference  Rooms in  Washington,  D.C.,  New York City and
Chicago.  Please call the SEC at 1-800-SEC-0330  for further  information on the
public   reference   rooms.   The  SEC   maintains   a   internet   website   at
http://www.sec.gov where certain of our publicly filed information may be found.

         This  Prospectus is part of a registration  statement we filed with the
SEC. The registration  statement  contains more information than this Prospectus
regarding  us  and  our  common  stock,   including  supplemental  exhibits  and
schedules.  You can get a copy of the registration statement from the SEC at the
address listed above or from its internet website.

         The SEC allows us to  "incorporate  by reference"  into this Prospectus
the  information we file with it. This means that we are deemed to be disclosing
such information to you by referring you to those documents. This information is
important and should be reviewed.  The information  incorporated by reference is
considered to be part of this  Prospectus,  and later  information  that we file
with the SEC will  automatically  update and supercede the  information  in this
Prospectus.

         We incorporate by reference into this  Prospectus the documents  listed
below and any future filings we make with the SEC under Sections  13(a),  13(c),
14 or 15(d) of the Securities Exchange Act of 1934:

   *   Annual Report on Form 10-K for the fiscal year ended June 30, 1998

   *   Quarterly Reports on Form 10-Q for the fiscal quarter ended September 30,
       1998;

   *   Current Report on Form 8-K, filed on December 15, 1998;

   *   Proxy Statement, dated October 2,  1998,  with respect to our 1998 annual
       meeting of stockholders; and

   *   Description  of  the common stock contained in Item 1 of our Registration
       Statement on Form 8-A, dated May 7, 1984.

         You may request a copy of these filings  (excluding all exhibits unless
we have  specifically  incorporated  an exhibit by  reference),  at no cost,  by
writing or telephoning us at:

                  Immunomedics, Inc.
                  300 American Road
                  Morris Plains, New Jersey 07950
                  (973) 605-8200
                  Attention: Investor Relations


         You  should  rely  on the  information  incorporated  by  reference  or
provided in this Prospectus or any supplement.  We have not authorized anyone to
provide  you  with  different  information.  You  should  not  assume  that  the
information  in this  Prospectus  or any  supplement  is accurate as of any date
other than the date on the front of such document. We are not making an offer of
our shares in any state where the offer is not permitted.


                                        3

<PAGE>



                                   THE COMPANY

Description of Our Business

         We are a biopharmaceutical  company,  which develops,  manufactures and
markets  products for the detection and treatment of cancers and other diseases.
These products, which are based on the Company's monoclonal antibody technology,
are designed to deliver radioisotopes,  chemotherapeutic agents, toxins, dyes or
other substances to a specific disease site or organ system.

         We have received  approval from the respective  regulatory  agencies in
the United States,  the 15 member  countries of the European  Union,  Canada and
certain  other  countries  to market and sell CEA-  Scan(R)  (arcitumomab),  our
imaging  product for the  detection of recurrent  and/or  metastatic  colorectal
cancer.

         We  also  have  received  approval  to  market  and  sell  LeukoScan(R)
(sulesomab),  our imaging  product for detection and diagnosis of  osteomyelitis
(bone  infection) in long bones and in diabetic foot ulcer  patients,  in the 15
member  countries of the European Union.  We have filed an application  with the
FDA in the U.S. and the comparable  regulatory  agency in Canada for approval to
market  LeukoScan  for  osteomyelitis  as well as for the  diagnosis  of  acute,
atypical appendicitis.

         Marketing, Sales and Distribution

         CEA-Scan is marketed  and sold in the U.S.  directly by our sales force
of  approximately  20 sales  representatives  and 3 regional  managers,  who are
deployed in major metropolitan  areas. Our skilled nuclear medicine  technicians
work with this  sales  force  and  provide  technical  support  directly  to our
customers.  We have entered into a  distribution  arrangement  in the U.S.  with
Integrated   Commercialization   Solutions,   a  division  of  Bergen   Brunswig
Corporation to provide  product support  services  including  customer  service,
order management, distribution, invoicing and collection.

         Our European  operations,  headquartered in Hillegom,  The Netherlands,
include European management, sales and marketing,  medical/regulatory,  customer
service and administration  (including  invoicing and collection).  We also have
established  sales  representation  in most major  European  markets,  including
Germany,  France, Italy and The United Kingdom. We service other markets through
the appointment of local distributors who provide sales and marketing support as
well as  local  product  distribution.  We  have an  agreement  with  Eli  Lilly
Deutschland GmbH to package and distribute our products throughout the 15 member
countries of the European Union and other countries.

         Imaging Products

         Our imaging  products  involve  injecting a patient with a radioisotope
attached to an  antibody  fragment.  An antibody is a protein  that can find and
attach  itself to a specific  substance  called an antigen.  Such  antigens  are
present  on tumor  cells,  white  blood  cells that  accumulate  at the sites of
infections,   and  other  disease  entities.   A  radioisotope   attached  to  a
disease-targeting  antibody is delivered to a disease site for imaging.  A gamma
camera (standard  nuclear  medicine  equipment used for imaging) is then used to
detect and display radioisotope concentrations, revealing the presence, location
and approximate size of the site of disease.

         The antibody fragment in CEA-Scan is directed against  carcinoembryonic
antigen  ('CEA'),  which is abundant at the site of virtually all cancers of the
colon or rectum (both primary tumors and metastases) and also is associated with
many other cancers.  We are conducting  phase IV clinical trials to evaluate the
product  following  re-administration.  We also are performing  clinical  trials
using CEA-Scan for imaging lung cancer and breast cancer.  We are discussing the
results of these clinical trials with the FDA and comparable European regulatory
authorities  to  determine  whether  such data will  support the  submission  of
applications for marketing approval.  In addition, we are continuing our efforts
in developing cancer detection  applications with CEA-Scan  utilizing  hand-held
radiation-detecting probes for use in colorectal cancer surgery.



                                        4

<PAGE>



         LeukoScan is a monoclonal antibody fragment, which seeks out, and binds
to granulocytes  (white blood cells) associated with a potentially wide range of
infectious and inflammatory diseases.

         We are studying the following three other imaging products  pursuant to
Investigational  New Drug  applications  that we have filed or plan to file with
the FDA and we have ongoing clinical trials in Europe:

         LymphoScan(R), for non-Hodgkin's B-cell lymphomas.

         AFP-Scan(R),  for liver cancer and germ-cell  tumors of the ovaries and
testes.

         MyeloScan(TM),  for imaging of bone marrow for  detection of metastatic
marrow disease.

         Therapeutic Products

         We are applying our expertise in antibody  selection,  modification and
chemistry  to cancer  therapeutics,  using  monoclonal  antibodies  labeled with
therapeutic  radioisotopes  or conjugated with drugs.  The Company is engaged in
developing   anti-cancer   products,   principally   with  a  technique   called
radioimmunotherapy.  This technique may deliver radiolabeled  therapeutic agents
to tumor sites more selectively  than current  radiation  therapy  technologies,
while minimizing debilitating side effects.

         Research Programs

         In addition to concentrating  on our products in clinical  development,
we conduct ongoing research in many related areas. We conduct research  in-house
and in collaboration  with The Center for Molecular Medicine and Immunology also
known as the Garden State Cancer Center and other academic and research centers.
During 1998, we executed a letter of intent to form a joint venture with Beckman
Coulter to develop the next generation of cancer  therapeutics using bi-specific
antibodies.  We believe our  ongoing  research  efforts  will  identify  new and
improved products and techniques for diagnosing and treating various cancers and
infectious diseases.

         Our research  efforts are focused in various  areas related to our core
technology,  including  antibody  engineering  and the  identification  of other
antibody-directed  approaches  to  cancer  therapy.  We  have  made  significant
progress in  humanizing  certain  mouse  antibodies  and have  reengineered  the
humanized antibodies with improved  characteristics.  We are continuing our work
on  selective  coupling  of  therapeutic  site  specific  agents  onto  antibody
fragments  which  will  offer the  advantage  of  loading  multiple  therapeutic
compounds  onto  antibodies  at a particular  disease  site. We also continue to
investigate  pretargeting whereby an antibody is administered first, followed by
a radionuclide administration.

         We also  are  continuing  our  research  into  the  use of  alternative
radioisotopes, such as Yttrium-90 in place of Iodine-131. Our research indicates
that  Yttrium-90 is retained by lymphoma cells for longer periods after antibody
metabolism,  and shows greater  efficacy  against  larger  tumors.  We also have
developed a  proprietary  technology  using a compound  called "DOTA" to tightly
bind Yttrium-90 to antibodies.

         We are also continuing our efforts to scale-up our  proprietary  method
for technetium-99m radiolabeling of peptides, using single-vial kits.

Recent Financing Arrangement

         On December 9, 1998,  we completed a private  placement of 1,250 shares
of Series F Convertible Preferred Stock to the selling stockholders and received
gross proceeds of $12,500,000.

         Each share of Series F Stock has an initial  stated  value of  $10,000,
which  increases  at the rate of 4  percent  per  annum.  The  Series F Stock is
convertible  at the  option of the  selling  stockholders,  in whole or in part,
beginning on June 8, 1999,  subject to  acceleration in certain  instances.  The
number of shares of common  stock  issuable  upon  conversion  of each  share of
Series F Stock will be  determined  by dividing the stated value of $10,000 plus
an accretion of 4 percent per annum, by the conversion price then in effect.


                                        5

<PAGE>



         The conversion price is equal to:

         *   the Variable Price, if such Variable Price is less than the Trigger
             Price;

         *   the  Trigger Price,  if the Variable Price  is equal  to or greater
             than the Trigger Price and
             less than 150 percent of the Trigger Price; or

         *   the Trigger Price plus one-half of the amount, if any, by which the
             Variable  Price  exceeds  150 percent of the Trigger Price,  if the
             Variable Price is greater that 150 percent of the Trigger Price.

          The "Trigger  Price" will be equal to 125 percent of the Initial Fixed
Price.  The "Initial Fixed Price" will be equal to the average closing bid price
of our common  stock  during  the 20  trading  days  ending  June 6,  1999.  The
"Variable  Price"  will be equal to the  average  of the 15 lowest  closing  bid
prices for our common stock  during the 45 trading  days  preceding a conversion
date.

         The selling  stockholders  have agreed to certain  restrictions  on the
amount of Series F Stock that can be converted  during the first several  months
after the Series F Stock would  otherwise be  convertible to the extent that the
Series F Stock  would be  convertible  at a price  less than 90  percent  of the
Initial Fixed Price.

         In  addition,  at any time  during  the  90-day  period  commencing  on
December 1, 1999, we may, require the selling  stockholders to purchase up to an
additional $7.5 million (750 shares) our of Series F Stock. Our right to require
the  selling  stockholders  to  purchase  this  additional  amount is subject to
certain  conditions and limitations,  including that the Variable Price has been
at least equal to the Initial Fixed Price for a specified  period of time. Under
certain  circumstances  and at certain prices, we may elect to redeem any shares
of  Series F Stock and under  certain  circumstances  may  require  the  selling
stockholders  to convert  their  Series F Stock.  We have  granted  the  selling
stockholders  certain  participation rights if we issue any future floating rate
convertible securities.

         Upon the occurrence of certain events that are within our control,  the
selling  stockholders may require us to redeem the Series F Stock at a price per
share equal to the greater of (i) 125 percent of the stated value of $10,000 per
share plus the  accretion  of 4 percent  per annum and (ii) the value of the our
common stock that would be issuable upon conversion of the Series F Stock.  Upon
the  occurrence of certain  events that are not within our control,  we have the
option to either redeem the Series F Stock or to readjust the  conversion  price
and/or to pay certain penalties.

         Each Investor has agreed that if it engages in short sales transactions
or other hedging  activities during the 45 trading days immediately  preceding a
conversion date which involve, among other things, sales of shares of our common
stock, the Investor will place its sale orders for common stock in the course of
such activities so as not to complete or effect any such sale on any trading day
during such  period at a price  which is lower than the lowest sale  effected on
such day by persons other than such Investor and its  affiliates.  Each Investor
also has agreed not to enter into any short  sales or other  hedging  activities
which involve,  among other things,  sales of shares of our common stock, during
the 25 trading days ending June 7, 1999.

         Under a related  registration rights agreement,  we have agreed to file
and  maintain   effectiveness  of  the  registration  statement  of  which  this
Prospectus is a part. If we fail to do so, the selling  stockholders may require
us to pay certain substantial penalties.

         In connection  with our agreements  with the selling  stockholders,  we
have  agreed to  reimburse  them for their  legal  expenses  in an amount not to
exceed $50,000.

         For more  information  concerning this transaction and the terms of the
Series F Stock,  we direct you to our Current  Report on Form 8-K which we filed
with the SEC on December  15,  1998,  which  provides  more details and contains
copies of the documents discussed above.


                                        6

<PAGE>



               SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS.

         We have made  statements  in this  Prospectus,  and in the documents we
incorporate by reference,  that are considered by the SEC to be "forward-looking
statements"  within the meaning of the Securities Act of 1933 and the Securities
Exchange Act of 1934.  Sometimes these  statements  contain words such as "may,"
"believe," "expect," "continue," "intend,"  "anticipate" or other similar words.
These statements are not guarantees of our future performance and are subject to
risks,  uncertainties and other factors that could cause our actual  performance
or achievements to be materially  different from those which we project. We have
no  obligation  to release  publicly  the result of any  revisions to any of our
"forward-looking statements" to reflect events or circumstances that occur after
the date of this Prospectus or to reflect the occurrence of other  unanticipated
events.

         The  following  factors,  among  others,  discussed  below  under "Risk
Factors" or in the documents  which we  incorporate  by  reference,  could cause
materially different results from those anticipated or projected:

         *   inherent  uncertainties  accompanying the marketing of CEA-Scan and
             LeukoScan

         *   inherent  uncertainties  involving  new  product  development   and
             marketing

         *   inability  to obtain  capital for continued product development and
             commercialization

         *   actions of regulatory authorities concerning product approval

         *   actions   of   government   and  private  organizations  concerning
             reimbursement of medical expenses

         *   impact of competitive products and pricing

         *   results of clinical trials

         *   loss of key employees

         *   changes in general economic and business conditions

         *   changes in industry trends


                                        7

<PAGE>



                                  RISK FACTORS

         Investing  in our common  stock  involves a high  degree of risk.  As a
result,  you should be able to sustain a complete  loss of your  investment.  In
addition  to the other  information  in this  Prospectus,  you should  carefully
consider the following factors before purchasing any of our common stock.

History of Operating Losses

         We have had  significant  operating  losses since our formation in 1992
and have not earned a profit since our  inception.  These  operating  losses and
failure to be profitable have been due mainly to the significant amount of money
that we have had to spend on research and development. As of September 30, 1998,
we had an  accumulated  deficit  of  approximately  $91  million.  We  expect to
continue to experience  operating  losses until such time, if at all, that it is
able to generate sufficient  revenues from sales of CEA-Scan,  LeukoScan and our
other proposed products.

Limited Number of Approved Products; Lack of Significant Product Revenues

         To date,  CEA-Scan(R) and  LeukoScan(R)  are the only products which we
are licensed to market and sell. To date, we have received only limited revenues
from the sale of these  products.  We cannot assure you that these products will
achieve  market  acceptance  or generate  significant  sales.  Unless we receive
substantial  revenues from these products,  future revenues will be dependent in
large part upon us receiving  payments from corporate  partners under  licensing
and research agreements or from government grants. However, we cannot assure you
that we will receive such payments in a timely manner, or at all.

         While we expect to  receive  approval  from the FDA to market  and sell
LeukoScan in the United States,  we cannot assure you that such approval will be
received  in a timely  manner,  if at all.  In  addition,  the FDA could  impose
conditions  on its approval,  which could  significantly  affect the  commercial
viability of the product or could require us to undertake significant additional
studies or otherwise expend additional  significant funds. If approval to market
and sell  LeukoScan in the United States is not received on a timely basis or if
the FDA  imposes  significant  conditions  or  restrictions,  our  business  and
operations could be significantly and adversely affected.

Uncertainty of Product Development

         We have a number of  diagnostic  and  therapeutic  products  in various
stages of development as well as new areas fro marketed products.  Before any of
our other  products  can be marketed  and sold,  we must  undertake  substantial
research and  development.  All new products face a high degree of  uncertainty,
including the following:

*        We may not receive regulatory approval to perform human clinical trials
         for the  products  we  currently  have  planned  or we may be unable to
         successfully complete our ongoing clinical trials.

*        We may be unable to obtain approval from the FDA and comparable foreign
         authorities  because we are unable to  demonstrate  that the product is
         safe and effective, or obtaining regulatory may take significantly more
         time and cost significantly more money than we currently anticipate.

*        We may discover that the product has  undesirable  or  unintended  side
         effects  or  other   characteristics   that  make  it   impossible   or
         impracticable  for us to  continue  development  or which may limit the
         product's commercial use.

*        We do not expect that any new product  which is  currently  in research
         and  development  will be  commercially  available for at least several
         years.

*        We  may  be  unable  to produce the product in commercial quantities at
         reasonable cost.

*        We may be unable  to  successfully  market  the  product  or to find an
         appropriate  corporate  partner,  if  necessary,  to  assist  us in the
         marketing of the product.

                                        8

<PAGE>




*        The product may not gain satisfactory market acceptance.

*        The product may be superceded by another product commercialized for the
         same indication(s).

         If  we  are  unable  to  continue  to  develop  products  that  we  can
successfully market, our business, financial condition and results of operations
will be significantly and adversely affected.

Unpredictability of Preclinical and Clinical Trials and Patient Enrollment

         Before obtaining regulatory approvals for the commercial sale of any of
our products under development,  we must demonstrate through preclinical studies
and  clinical  trials that the product is safe and  efficacious  for use for the
indication for which approval is sought.  The results from  preclinical  studies
and early clinical trials may not necessarily be indicative of results that will
be obtained  in  later-stage  testing  and we cannot  assure you that our future
clinical trials will  demonstrate the safety and efficacy of any of our products
or will result in  approval to market  products.  A number of  companies  in the
biotechnology  industry have suffered  significant setbacks in advanced clinical
trials, even after promising results in earlier trials.

         Our ability to timely  complete our clinical  trials is dependent  upon
many factors,  including our investigators' ability to recruit patients for such
trials. Patient enrollment is a function of many factors,, including the size of
the patient population, the nature of the protocol, the proximity of patients to
clinical  sites and the  eligibility  criteria for the study.  Delays in planned
patient  enrollment  may  result  in  increased  costs  and  delays,  which  may
significantly and adversely affect us.

Need for Additional Capital

         For the  foreseeable  future,  we will  require  significant  financial
resources  for us to  continue  our  budgeted  levels of  expenses  and  capital
expenditures, including for:

*        Ongoing pre-clinical and clinical trials of our existing products.

*        Research and development of new products.

*        Marketing and sales of CEA-Scan and LeukoScan.

*        Marketing  and  sales  for  our  other products if we receive necessary
         regulatory approvals.

*        Capital expenditures, including Year 2000 compliance upgrades

         While  we  believe  that  our  projected  financial  resources  will be
sufficient to fund our anticipated  operating expenses and capital  expenditures
through  calendar  1999,  unless  our  existing  products  generate  significant
revenues or we enter into corporate partnering arrangements,  thereafter we will
require additional  financial  resources in order to continue our planned levels
of research and  development  and clinical  trials of our proposed  products and
regulatory  filings  for  new  indications  of  existing  products.   Without  a
significant  increase in product revenues or other infusion of capital,  we will
be required to significantly reduce our operating expenses, including the amount
of resources  devoted to marketing and sales,  product  development and clinical
trials,  which  could have a  significant  and  adverse  effect on us. We cannot
assure you that any  additional  financing  will be available to us at all or on
terms we find  acceptable  or that the  terms of such  financing  will not cause
substantial dilution to our existing stockholders.

Limited Marketing and Sales Experience and Capability

         We  have  only  recently   established  our  own  sales  and  marketing
organization to market CEA-Scan and LeukoScan.  We cannot assure you that we can
successfully  maintain and continue to build such sales force.  If we are unable
to continue to build and maintain our sales force,  our financial  condition and
operating results may be significantly and adversely affected.

                                        9

<PAGE>




         Our  commercial  sale of our proposed  products  may be dependent  upon
entering our into arrangements with corporate  partners and we cannot assure you
that  we  will  be  successful  in  forming  such  relationships  or  that  such
relationships, even if formed, will be successful.

Dependence on Third Parties for Distribution of Products

         We  currently  do not have the  resources  to  internally  develop  and
maintain the operating  procedures  required by the FDA and  comparable  foreign
regulatory  authorities to oversee distribution of our products. As a result, we
have entered into  arrangements  with third parties to perform such function for
the foreseeable future. If these agreements are terminated,  we will be required
to enter into arrangements with other approved third parties in order to be able
to distribute our products. If we are unable to have a distribution  arrangement
in place with a  FDA-approved  distributor  prior to  termination of an existing
arrangement,  we will be unable to continue to distribute  our products until an
acceptable  alternative is identified and our business may be significantly  and
adversely effected.

Limited Manufacturing Capability

         While  we  have  the  capacity  to  manufacture   all  of  our  current
requirements for CEA-Scan and LeukoScan,  if demand for these product  increases
significantly,  we cannot  assure you that we will continue to have the capacity
to manufacture  commercial quantities  successfully.  In addition, if any of our
other products are approved for marketing and sale, we cannot assure you that we
will  continue to have the capacity  and  expertise  to  manufacture  commercial
quantities of multiple products successfully or with acceptable profit margins.

         We rely on a single third party to perform certain  end-stage  portions
of the manufacturing process for CEA-Scan and LeukoScan. While we have qualified
a second entity in the event a second  end-stage  manufacturer  is required,  we
cannot assure that we will be able to negotiate an agreement with such entity on
terms we consider acceptable, if at all.

Dependence on Fluids Produced in Mice

                  CEA-Scan and certain of our other  imaging  agents are derived
from  ascites  fluid  produced  in mice,  which are  provided  by a  third-party
supplier.  Regulatory  authorities,   particularly  in  Europe,  have  expressed
concerns  about  the  use  of  mice  fluid  for  the  production  of  monoclonal
antibodies.  While we believe that our current quality control procedures ensure
the purity of the fluid we use, we cannot assure you that regulatory authorities
will agree that these procedures will be adequate for future products.  While we
are  continuing  our  development  efforts to produce  certain of our monoclonal
antibodies  using cell culture methods,  this process  constitutes a substantial
production change, which will require additional manufacturing equipment and new
regulatory  approval.  We cannot  assure you that we will have the  resources to
acquire the  additional  manufacturing  equipment  and resources or that we will
receive the required  regulatory  approval on a timely basis, if at all. We have
also contracted with a third party for the development and production of certain
humanized  antibodies,  however  we  cannot  assure  that such  efforts  will be
successful.

Dependence on The Center for Molecular Medicine and Immunology

         Our product  development has involved,  to varying degrees,  The Center
for Molecular Medicine and Immunology,  a not-for-profit cancer research center.
CMMI performs  pilot and  pre-clinical  trials in product areas of importance to
us. CMMI also conducts  basic  research and patient  evaluations  in a number of
areas of potential interest to us, the results of which are made available to us
pursuant to a collaborative research and license agreement. We cannot assure you
that CMMI will be successful in its research  activities or that it will develop
any potential products which can be licensed by us.

         In  addition,  if CMMI were no  longer to  conduct  such  research  and
patient  evaluations,  we would have to make arrangements with third parties for
the performance of this aspect of our clinical  research,  which may prolong and
increase  expenses  associated with  pre-clinical  testing and initial  clinical
trials.


                                       10

<PAGE>



Potential Conflicts of Interest with The Center
for Molecular Medicine and Immunology

         Dr.  David M.  Goldenberg,  our  Chairman of the Board and former Chief
Executive  Officer,  is the  founder,  President  and a member  of the  Board of
Trustees of CMMI. Dr. Goldenberg  devotes more of his time working for CMMI than
for us. In addition, other key personnel currently have responsibilities both to
CMMI  and us.  While  we have put in place  certain  procedural  safeguards  and
mechanisms  relating to the  allocation  of research  projects and  licensing of
proprietary rights between CMMI and us, due to Dr. Goldenberg's and other of our
key employees  relationships  with both entities,  the potential for conflict of
interest exists.

Extensive Government Regulation

         Regulation by governmental authorities in the United States and foreign
countries  is a  significant  factor in the  manufacture  and  marketing  of our
presently marketed and proposed products as well as our research and development
activities.  All of our proposed  products will require  regulatory  approval by
governmental  agencies prior to commercialization  and our products must undergo
rigorous   preclinical  and  clinical  testing  and  other  premarket   approval
procedures by the FDA and similar authorities in foreign countries. In addition,
since  certain  of  our  potential  products  involve  the  application  of  new
technologies,  regulatory  approvals may take longer than for products  produced
using  more  conventional  methods.  Once we  begin  clinical  trials  for a new
diagnostic or  therapeutic  product,  it may take five to ten years (or more) to
receive the required regulatory approval to commercialize that product and begin
to market it to the public.  Various federal and, in some cases,  state statutes
and regulations also govern or influence the  manufacturing,  safety,  labeling,
storage,  record keeping and marketing of such products.  The lengthy process of
seeking these approvals,  and the subsequent compliance with applicable statutes
and regulations,  will require us to expend substantial resources. If we fail to
obtain  or  are  otherwise   substantially  delayed  in  obtaining,   regulatory
approvals,  our business and  operations  could be  significantly  and adversely
affected.

         In  responding  to  a  new  drug  application,  or a  biologic  license
application,   the  FDA  may  grant  marketing  approvals,   request  additional
information or further  research,  or deny the application if it determines that
the application does not satisfy its regulatory approval criteria. Approvals may
not be granted on a timely basis, if at all, or if granted may not cover all the
clinical   indications  for  which  we  are  seeking  approval  or  may  contain
significant   limitations   in   the   form   of   warnings,    precautions   or
contraindications with respect to conditions of use.

         In  addition to laws and  regulations  enforced by the FDA, we are also
subject to regulation  under the various other federal,  state or local laws and
regulations.  Our  research  and  development  involves  the  controlled  use of
hazardous  materials,  chemicals,  viruses  and various  radioactive  compounds.
Although we believe our safety  procedures  for handling  and  disposing of such
materials comply with the standards prescribed by state and federal regulations,
the risk of accidental  contamination  or injury from these materials  cannot be
completely  eliminated.  If an accident occurs,  we could be held liable for any
damages that result and any such liability could exceed our resources.

         Our facilities are subject to inspection by the FDA. A separate license
from the FDA is required for commercial  manufacture of any product.  Failure to
maintain  such  licenses  or to meet the  inspection  criteria  of the FDA would
result in disruption to our manufacturing processes and could have a significant
and adverse affect on our business and operations.

         For  marketing  outside  the United  States,  we are subject to foreign
regulatory  requirements  governing human clinical trials and marketing approval
for drugs and  devices.  The  requirements  governing  the  conduct of  clinical
trials,  product licensing,  pricing and reimbursement vary greatly from country
to country.  Failure to comply with such regulatory  requirements or obtain such
approvals  could  impair our ability to develop  these  markets and could have a
significant and adverse affect on our business and operations.


                                       11

<PAGE>



Uncertainty of Health Care Reimbursement

         Our ability to successfully  commercialize  our products will depend in
part on the  extent to which  reimbursement  for the cost of such  products  and
related  treatment  will be  available  from  government  health  administration
authorities,  private health insurers and other organizations.  Such third-party
payers are increasingly  challenging the price of medical products and services.
Several proposals have been made that may lead to a government-directed national
health care system.  Adoption of such a system could further limit reimbursement
for  medical  products,  and we  cannot  assure  you that  adequate  third-party
coverage will be available to enable us to maintain  price levels  sufficient to
realize an  appropriate  return on our  investment  in product  development.  In
addition,  we also cannot assure you that the U.S. government will not implement
a system of price controls.  Any such system might adversely  affect our ability
to market our products profitably.

Dependence on Key Personnel

         The  continued  development  of our business and  operations  is highly
dependent upon the talents of Dr. Goldenberg and certain key executive  officers
and scientific  personnel.  If Dr.  Goldenberg or any of our other key personnel
leave our employ, our operations could be significantly and adversely  affected.
In addition,  we have an ongoing  need to expand our  management  personnel  and
support staff.  Competition  for qualified  personnel in the  biotechnology  and
pharmaceutical  industries  is intense and we cannot  assure you that we will be
successful in our  recruitment  efforts.  If we are unable to attract and retain
additional qualified  personnel,  our operations also could be significantly and
adversely affected.

Possible Inability to Successfully Compete

         The biotechnology  industry is highly competitive,  particularly in the
area of cancer diagnostic and therapeutic  products.  We are likely to encounter
significant  competition  with respect to our  existing  products as well as our
products  currently  under  development.  A number of companies,  including IDEC
Pharaceuticals,   Genenitech,  Smithkilne  Beecham,  Nycomed-Amersham,   Coulter
Pharamceuticals,  are engaged in the biotechnology  field, and in particular the
development  of  cancer  diagnostic  and  therapeutic  products.  Many of  these
companies  have  significantly   greater  financial,   technical  and  marketing
resources  significantly than us. In addition,  many of these companies may have
more  established  positions  in the  pharmaceutical  industry and may be better
equipped than us to develop, refine and market their products.

         We also expect to face increasing  competition  from  universities  and
other  non-profit  research  organizations.   These  institutions  carry  out  a
significant  amount of research and  development in the field of  antibody-based
technology.  These  institutions  are  becoming  increasingly  more aware of the
commercial  value of their  findings and more active in seeking patent and other
proprietary rights, as well as licensing revenues.

Impact of Rapid Technological Change

         We are  pursuing an area of product  development  in which there is the
potential for extensive technological  innovation in relatively short periods of
time. We cannot assure you that our  competitors  will not succeed in developing
products that are safer or more effective than our products. Rapid technological
change or developments  by others may result in our current  products as well as
those in development becoming non-competitive or obsolete.

Limited Protection of Intellectual Property Rights

         Our  commercial  success is highly  dependent  upon  patents  and other
proprietary  rights  that we own or  license.  While  we  actively  seek  patent
protection both in the United States and abroad for our proprietary  technology,
we  cannot  assure  you that our key  patents  will not be  invalidated  or will
provide  us  protection  that has  commercial  significance.  Litigation  may be
necessary  to  protect  our  patent  positions,  which  could be costly and time
consuming. If any of our key patents that we own or license are invalidated, our
business may be significantly and adversely affected.


                                       12

<PAGE>



         While we believe  that the  protection  of patents is  important to our
business,  we also rely on trade  secrets,  unpatented  know-how and  continuing
technological  advancement to establish and maintain our  competitive  position.
Other companies may  independently  develop similar trade secrets or know-how or
obtain access to our trade secrets,  know-how or proprietary  technology,  which
could significantly and adversely affect our business.  Other companies may have
filed   applications  for  or  have  been  issued  patents  and  obtained  other
proprietary  rights to technology  which may be potentially  useful to us. If we
determine  that the  inventions  covered by such patents are necessary or useful
for us, we may attempt to license  such rights.  We cannot  assure you that such
rights will be available at all or even upon terms we consider acceptable. If we
are unable to obtain  such  rights,  our  business  could be  significantly  and
adversely affected.

Specific Patent Issues Involving CEA-Scan

         We  have  sued  F.   Hoffmann-LaRoche  and  its  Roche  subsidiary  and
affiliates  in the  Netherlands  for what we believe to be  infringement  of our
European patent covering  specific  anti-CEA  antibodies.  They have denied that
they are  infringing our patents and  counter-sued  seeking to nullify our Dutch
and German patents.  A trial was held on our infringement claim before the Dutch
Patent  Court,  resulting  in dismissal of the action based in part on the trial
judge's inability to resolve validity issues without a full trial of the nullity
action.  While we have appealed the  dismissal,  we cannot assure you we will be
successful. In addition, while the trial on the Dutch nullity action resulted in
dismissal of that action and  maintenance  of all our patent  claims,  Roche has
appealed  and we cannot  assure you that the appeal  court will also rule in our
favor.  The trial in the German  nullity  action has been concluded in our favor
but we do not know if Roche will appeal or, if they do, that the appellate court
also will rule in our favor.

         We believe that affirmation of the validity of this patent is important
because its claims  also  protect the  antibody  we use in our  CEA-Scan  cancer
imaging product and our CEA-Cide cancer therapy  product,  as well as the use of
highly specific anti-CEA antibodies for a number of other uses. While we believe
that our  European  patents are valid and that  Hoffmann-LaRoche  has  infringed
them, and that an unfavorable outcome in the infringement and nullity actions is
unlikely,   if  we  receive  an  unfavorable  outcome,  our  business  could  be
significantly and adversely affected.

Product Liability

         The  clinical  testing,  marketing  and  manufacturing  of our products
necessarily  involves the risk of product  liability.  While we  currently  have
product  liability  insurance,  we cannot  assure that we will be able to obtain
such  insurance  in the future at an  acceptable  cost,  if at all. If we cannot
maintain our existing or  comparable  liability  insurance,  our ability to test
clinically and market our products may be significantly impaired.  Moreover, the
amount and scope of our insurance coverage or indemnification  arrangements with
any  distributor  or other third party upon which we rely may be  inadequate  to
protect us in the event of a successful product liability claim.

Control by Existing Principal Stockholder

         As of December 29, 1998,  Dr.  Goldenberg  controlled the right to vote
over approximately 35 percent of over common stock (including those shares which
he is  entitled  to vote by powers of  attorney  or proxy  granted to him by his
children and his former wife). As a result of such holdings,  Dr. Goldenberg may
have the  ability to  determine  the  election of all of our  directors,  direct
policies and control the outcome of  substantially  all matters which may be put
to a vote of our stockholders.

Potential Redemption of Series F Stock or Penalty Payments;

         The  Series F Stock is  subject  to  redemption  at the  option  of the
holders under certain circumstances,  including,  if a consolidation,  merger or
other business combination is completed or a purchase,  tender or exchange offer
is  accepted  by holders of our common  stock that is  approved  by our Board of
Directors. In addition, if certain other events occur, we may be required to pay
significant  penalties  (which  could be as much as 15  percent  per year of the
stated value of the Series F Stock)  and/or reduce the  conversion  price of the
Series F Stock. These events include:


                                       13

<PAGE>



*        If a consolidation,  merger or other business  combination  occurs or a
         purchase,   tender  or  exchange  offer  is  accepted  by  a  specified
         percentage of the holders of the Common Stock, that was not approved by
         our Board of Directors.

*        If we do not file the registration  statement (of which this Prospectus
         is a part)  with the SEC by  January  23,  1999,  if such  registration
         statement does not become  effective by May 8, 1999, or, if, after such
         registration statement becomes effective,  it ceases to be available to
         the selling  stockholders  for the resale of their shares for more than
         10 consecutive days.

*        If our common stock is delisted from the Nasdaq National Market.

*        If we fail to hold a Special Meeting of Stockholders on or before March
         23, 1999,  to seek  approval of the issuance of any shares in excess of
         7,577,617  of common stock  issuable  upon  conversion  of the Series F
         Stock (as  required by the rules of The Nasdaq Stock  Market,  Inc.) or
         the proposal is not approved by stockholders.

         If any of the foregoing  events occur,  and, as a result  thereof,  the
holders of the Series F Stock  exercise  their rights of redemption or rights to
receive the penalty payments, we may not have the financial ability to make such
payments. Even we have the financial ability to redeem the Series F Stock or pay
the required  penalties,  such payment could  significantly and adversely affect
our financial condition and deplete our cash resources

Substantial Dilution; Potential for Issuance of
Significant Number of Shares of Common Stock

         The  Series  F   Preferred   Shares  that  we  issued  to  the  selling
stockholders  generally  will become fully  converted  into shares of our common
stock beginning on June 8, 1999.  Because the conversion  price for the Series F
Preferred Shares is not fixed, we may be required to issue to them a significant
number  of  shares  of  our  common  stock  (although  we are  only  registering
10,000,000  shares  for  resale  by them at this  time).  The  conversion  price
generally will be determined  under a formula based upon the average closing bid
price of our  common  stock over the  lowest 15 days  during  the 45-day  period
immediately  prior to a conversion date. Had the Series F Stock been immediately
convertible, as of December 24, 1998, the conversion price would have been $2.84
per  share and we would  have been  required  to issue  approximately  4,402,000
shares of our common stock had the holders converted all of their Series F Stock
on such date.

         Given that the  conversion  price is based on the average of the lowest
closing price during a specified  period, it is likely that the market price for
our common stock will be significantly greater than the conversion price for the
Series F Preferred  Shares in effect at the time of conversion.  In such a case,
the conversion of a significant  number of Series F Preferred Shares into common
stock during that period would dilute our other stockholders.

         In addition, the resale by the selling stockholders of the common stock
could depress the market price of our common stock.  Moreover, as all the common
stock to be sold to the selling  stockholders  generally  will be available  for
immediate  resale by them on and after June 8, 1999,  the mere  prospect of such
sales could further adversely affect the market price for our common stock.

          For  more  information  about  the  Series F Stock, see "The Company -
Recent Financing Arrangement."

Potential Adverse Impact on Market Price of Common Stock

         As of December 29, 1998, we had a total of 37,888,090  shares of common
stock  issued  and  outstanding,   of  which  29,580,102  shares  were  held  by
non-affiliates and are freely tradeable in the public market without restriction
under the Securities Act of 1933.  The remaining  8,307,988  shares were held by
our directors and executive officers and are considered "restricted  securities"
subject to the resale  limitations  of Rule 144 under the  Securities  Act.  The
prospect of the ability to publicly resell these restricted shares may adversely
affect prevailing market prices for the common stock.

                                       14

<PAGE>




Stock Price Volatility

         We believe  that a variety of factors  have caused the market  price of
our common stock to fluctuate  substantially,  and that they will continue to do
so in the future. These factors include:

*        actual or anticipated fluctuations in our operating results;

*        the status of our products in development;

*        new  products  or  technical  innovations  by  us or by our existing or
         potential competitors;

*        the  formation  or  termination   of   our   corporate   alliances  and
         distribution arrangements;

*        prolonged periods of  regulatory review of new products or new uses for
         existing products

*        determinations regarding our patent applications and those of others;

*        trading  strategies  occurring  in the market place with respect to our
         common stock; and

*        general market conditions and  other factors unrelated to us or outside
         our control.

Effect of Certain Anti-Takeover Provisions

         Our Board of Directors has the  authority,  without any further vote by
our stockholders,  to issue up to 10,000,000 shares of preferred stock in one or
more series and to determine the designations, powers, preferences and relative,
participating,  optional or other rights  thereof,  including  the dividend rate
(and whether dividends are cumulative), conversion rights, voting rights, rights
and terms of redemption,  redemption price and liquidation preference.  Issuance
of preferred stock could have the effect of delaying,  deterring or preventing a
change in control of our Company,  or could impose various  procedural and other
requirements  that could make it more  difficult for holders of our common stock
to effect certain corporate actions,  including the ability to replace incumbent
directors  and to  accomplish  transactions  opposed by the  incumbent  Board of
Directors.  The rights of the  holders of our common  stock would be subject to,
and may be  adversely  affected  by, the rights of the holders of any  preferred
stock that may be issued in the future.

         Further,  pursuant to the terms of our stockholder rights plan, we have
distributed  as a dividend for each  outstanding  shares of our common stock,  a
preferred stock purchase right.  This right will cause  substantial  dilution to
the  ownership  of a person or group  that  attempts  to acquire us on terms not
approved  in  advance  by our  Board of  Directors  and may have the  effect  of
deterring hostile takeover attempts.

Year 2000 Compliance

         Computer systems may experience problems handling dates beyond the year
1999 because many computer  programs use only two digits to identify a year in a
date  field.  We are in the  process  of  conducting  a review  of our  business
systems,  including our computer systems and  manufacturing  equipment.  We also
have sent written  inquiries to our  customers,  distributors  and vendors as to
their  progress in identifying  and  addressing  problems that their systems may
face in correctly  interpreting and processing date information as the year 2000
approaches and is reached.  We expect that our review will be completed by March
1999.  Based on this review,  we intend to implement a plan to achieve year 2000
compliance.  However,  we cannot  assure  that our review will be  completed  as
schedule or that our  compliance  program will be implemented on a timely basis.
While we believe  that we will achieve  year 2000  compliance  in a manner which
will be non-disruptive to our operations,  unforeseen  complications could arise
that could disrupt our operations.  In addition, while we have commenced work on
various types of contingency  planning to address  potential  problem areas with
internal systems,  suppliers and other third parties,  we cannot assure you that
we will be able to implement our contingency plan in a timely manner, if at all.

                                       15

<PAGE>




         While  we do  not  believe  that  Year  2000  compliance  will  have  a
significant  affect on our business or operations,  we could encounter  problems
with supplier and or revenue sources which could adversely  affect us. We cannot
accurately  predict the occurrence and or outcome of any such problems,  nor can
we currently  estimate the dollar  amount of such problem , which may or may not
be  significant.  In addition,  we cannot  assure you that the failure to ensure
year 2000  compliance by a third party would not have a significant  and adverse
affect on our business and operations.

No Expectation that We will Pay Dividends

         We have never paid any dividends and, for the  foreseeable  future,  we
expect to retain  earnings,  if any, to finance the expansion and development of
our business.  Any future  payment of dividends will be within the discretion of
our Board of Directors and will depend upon a variety of factors,  including our
earnings,  capital  requirements,  and  operating and  financial  condition.  In
addition,  we are required to obtain the approval of the holders of the Series F
Stock prior to the payment of any dividends on our common stock.


                                       16

<PAGE>



                                 USE OF PROCEEDS

         We will not receive any  proceeds  from the sale of our common stock by
the selling stockholders.  However, we did receive net proceeds of approximately
$12,350,000 from the issuance of the Series F Stock to the selling stockholders.

         We will  use  the net  proceeds  we  received  from  the  sales  of our
preferred  securities for general  corporate  purposes,  including  research and
development,  clinical trials, regulatory filings, manufacturing,  marketing and
sales,  general and administrative and other expenses,  acquisitions of products
and  technologies,   license,  milestone,  royalty  and  similar  payments,  and
strategic and other acquisitions.

                                       17

<PAGE>



                              SELLING STOCKHOLDERS

         The table below presents the following  information:  (1) the number of
shares of Series F Stock  owned by each  selling  stockholder  (2) the number of
shares of common stock beneficially owned by each selling  stockholder as of the
date of this Prospectus,  (3) the number of shares that such selling stockholder
is  offering  under  this  Prospectus,  and (4) the  number of shares  that such
selling stockholder will beneficially own after the completion of this offering.

         None of the selling  stockholders has had a material  relationship with
us within the past three  years,  other  than as a result of their  purchase  of
shares of our Series F Stock. As of the date hereof, no selling stockholder owns
any shares of our common  stock  other than the  shares  they may  acquire  upon
conversion of the Series F Stock.

<TABLE>
<CAPTION>


                                                                   Shares of                          Shares of
                                                    Shares of     Common Stock       Shares of       Common Stock
                                                    Preferred     Beneficially     Common Stock      Beneficially
                                                      Stock      Owned Prior to        Being         Owned After
Selling Stockholder                                   Owned     the Offering (1)    Offered (2)      Offering(3)
- --------------------                                  -----     ----------------    -----------      -----------
<S>                                                 <C>         <C>                <C>               <C>
AG Super Fund International Partners, L.P.(4)              20              70,442           70,442            0
Fisher Capital Ltd.(5)                                    195             686,813          686,813            0
GAM Arbitrage investments, Inc.(4)                         20              70,442           70,442            0
HFTP Investment L.L.C.(6)                                 650           2,289,378        2,289,378            0
Leonardo, L.P.(4)                                         200             704,424          704,424            0
Ramius Fund, Ltd.(4)                                       40             140,885          140,885            0
Raphael, L.P.(4)                                           20              70,442           70,442            0
Wingate Capital Ltd.(5)                                   105             369,823          369,823            0

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

         Based upon 37,888,090 shares of common stock outstanding as of December
         29, 1998.  Except as otherwise noted herein,  the number and percentage
         of shares  beneficially  owned is determined  in  accordance  with Rule
         13d-3 of the  Exchange  Act,  and the  information  is not  necessarily
         indicative of beneficial  ownership for any other  purpose.  Under such
         rule,  beneficial  ownership  includes  any  shares  as  to  which  the
         individual has sole or shared voting power or investment power and also
         any shares which the individual has the right to acquire within 60 days
         of the date of this Prospectus through the exercise of any stock option
         or other  right.  Unless  otherwise  indicated in the  footnotes,  each
         person has sole voting and investment  with respect to the shares shown
         as beneficially owned.

         The number of shares of our common stock shown as beneficially owned by
         the selling stockholders prior to the offering represents shares of our
         common stock issuable to them assuming  conversion,  as of December 24,
         1998,  of all  shares of Series F Stock  with  respect  to the  $10,000
         stated value of the Series F Stock plus an  accretion  of 4 percent per
         year. The number of shares was calculated  using an assumed  conversion
         price of $2.84, which representing the average of the 15 lowest closing
         bid prices for the Common Stock during the 45 consecutive trading  days
         ending on December 24, 1998. Based upon the conversion price provisions
         of the Series F Stock, the conversion price will fluctuate from time to
         time based on changes in the  market  price of our common  stock.  This
         Prospectus  also  covers  the  resale of such  presently  indeterminate
         number of additional  shares as may be issuable upon  conversion of the
         Series F Stock  based upon  fluctuations  in the  conversion  price and
         certain  antidilution  provisions.  As  described  in the section  "The
         Company - Recent  Financing  Arrangement"  above,  the actual number of
         shares of our common stock  issuable  upon  conversion  of the Series F
         Stock is based

                                       18

<PAGE>



         upon the  market  price  of  common  stock  at the time of  conversion;
         therefore.  Therefore,  the actual number of shares of common stock may
         be less than or greater than the number shown as beneficially  owned by
         the selling stockholders or pf the number covered by this Prospectus.

(2)      The  number  of  shares  of Common  Stock  registered  pursuant  to the
         Registration  Statement on behalf of the selling  stockholders  and the
         number of Shares offered hereby by such holders have been determined by
         agreement between the selling  stockholders and us.. Because the number
         of shares that will  ultimately be issued upon conversion of the Series
         F Stock is dependent, subject to certain limitations,  upon the average
         of certain  closing bid prices of our common stock prior to  conversion
         as discussed above,  such number of shares (and therefore the number of
         shares offered hereby) cannot be determined at this time.

         Pursuant to the terms of a Registration Rights Agreement dated December
         9, 1998, we are required to register for resale at least 200 percent of
         the number of shares of common stock that would be issuable  if all the
         Series F Stock were converted as of the date of this Prospectus.

         Pursuant  to the  terms of the  Series F Stock,  no  holder of Series F
         Stock may  convert  the Series F Stock to the extent that the shares of
         our common  stock to be received  by such  holder upon such  conversion
         would cause such  holder to beneficially  own more than 4.99 percent of
         the outstanding shares of Common  Stock. In  addition, pursuant  to the
         regulations of The National Association of Securities Dealers, Inc., in
         the absence of stockholder approval,  the aggregate number of shares of
         our common  stock  issuable  to the  holders of the Series F Stock at a
         discount from  market  price  upon conversion of the Series F Stock may
         not equal  or  exceed 20 percent of  the  outstanding  shares of Common
         Stock on December 9, 1998  (i.e.,  approximately  7,577,617 shares). If
         stockholder  approval  is  not  obtained to  issue shares of our common
         stock to the holders  of the  Series F Stock in excess of such  amount,
         none of the holders will be entitled  to  acquire  by  conversion  more
         than its proportionate share of such maximum amount.

(3)      Assumes  that the selling  stockholder  has sold all of the sale of all
         the  shares of our  common  stock  which may be sold  pursuant  to this
         Prospectus.

(4)      Angelo,  Gordon & Co., L.P. is a general partner of Leonardo,  L.P., AG
         Super Fund  International  Partners,  L.P.  and Raphael,  L.P.,  and is
         investment advisor to GAM Arbitrage Investments,  Inc. and Ramius Fund,
         Ltd. and consequently has voting control and investment discretion over
         securities  held by such  entities.  The  ownership  for  each of these
         entities  does not  include  the  ownership  information  for the other
         entities.  Angelo,  Gordon  & Co.,  L.P.  and  each  of the  referenced
         entities disclaims  beneficial  ownership of any of our securities held
         by the  other  referenced  entities.  Mr.  John M.  Angelo,  the  Chief
         Executive  Officer of Angelo,  Gordon & Co.,  L.P.,  and Mr. Michael R.
         Gordon, the Chief Operating Officer of Angelo,  Gordon & Co., L.P., are
         the sole  general  partners  of AG  Partners,  L.P.,  which is the sole
         general  partner of Angelo,  Gordon & Co., L.P. As such, Mr. Angelo and
         Mr. Gordon may be considered beneficial owners of any of our securities
         deemed to be beneficially owned by Angelo, Gordon & Co., L.P.

(5)      Citadel  Limited  Partnership is the trading manager of Wingate Capital
         Ltd. and Fisher  Capital Ltd. and  consequently  has voting control and
         investment  discretion over  securities held by such entities.  Citadel
         Limited Partnership is indirectly controlled by Mr. Kenneth C. Griffin.
         The  ownership  for  each  entities  does  not  include  the  ownership
         information  for  the  other  referenced   entities.   Citadel  Limited
         Partnership and each of the referenced  entities  disclaims  beneficial
         ownership  of any of our  securities  held by the other  entities.  Mr.
         Griffin  disclaims  beneficial  ownership  of  any  of  our  securities
         beneficially  owned by Citadel  Limited  Partnership  or the referenced
         entities.

(6)      Promethean Investment Group  L.L.C.  is the investment advisor for HFTP
         Investment L.L.C.  and consequently  has voting  control and investment
         discretion over securities held by such entity.   Promethean Investment
         Group  L.L.C.  is  indirectly  controlled  by Mr. James F. O'Brien, Jr.
         Promethean Investment Group L.L.C.  disclaims  beneficial  ownership of
         any  of  our  securities  held  by  HFTP Investment L.L.C.  Mr. O'Brien
         disclaims  beneficial  ownership  of any of our securities beneficially
         owned by Promethean Investment Group L.L.C.

                                       19

<PAGE>



                              PLAN OF DISTRIBUTION

Manner of Sales; Broker-Dealer Compensation.

         The selling  stockholders may sell any shares of common stock that they
acquire when they convert shares of Series F Stock. The selling stockholders may
elect to sell any such shares in  privately  negotiated  transactions  or in the
over-the-counter  market through  brokers and dealers.  Such brokers and dealers
may act as agent or as principals.  They may receive compensation in the form of
discounts,  concessions or commissions from the selling stockholders or from the
purchasers of their shares of common stock for whom the  broker-dealers  may act
as agent or to whom the  broker-dealers  may  sell as  principal,  or both.  The
selling  stockholders  also may sell the shares in reliance  upon Rule 144 under
the  Securities  Act at such times as they are  eligible  to do so. We have been
advised by the selling stockholders that they have not made any arrangements for
the distribution of the shares of common stock.  Broker-dealers who effect sales
for  the  selling   stockholders  may  arrange  for  other   broker-dealers   to
participate.  Broker-dealers  engaged by the selling  stockholders  will receive
commissions  or  discounts  from them in amounts to be  negotiated  prior to the
sale.

Filing of Supplement to Prospectus In Certain Instances.

         If any selling stockholder  notifies us that he or she has entered into
a material arrangement (other than a customary brokerage account agreement) with
a broker or dealer for the sale of shares of common stock under this  Prospectus
through a block trade, purchase by a broker or dealer or similar transaction, we
will file a supplement to this Prospectus under Rule 424(c) under the Securities
Act. Such a supplement will disclose:

*        The name of each such broker-dealer.

*        The number of Shares involved.

*        The price at which those Shares were sold.

*        The commissions paid or discounts or concessions allowed to such broker
         -dealer(s).

*        If  applicable,   that  such   broker-dealer(s)  did  not  conduct  any
         investigation  to verify the  information  contained or incorporated by
         reference in this prospectus, as supplemented.

*        Any other facts material to the transaction.

Certain Persons Deemed to be Underwriters

         The selling  stockholders and any  broker-dealers who execute sales for
them may be deemed to be "underwriters" within the meaning of the Securities Act
because  of the  number of  shares of common  stock to be sold or resold by such
persons or entities or the manner of sale of such shares,  or both. If a 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 to be  underwriting
discounts and commissions under the Securities Act.

Regulation M

         We have informed the selling stockholders that Regulation M promulgated
under the Securities  Exchange Act may be applicable to them with respect to any
purchase  or sale of  shares  of  common  stock.  In  general,  Rule  102  under
Regulation M prohibits any person  connected with a  distribution  of our common
stock (a "Distribution")  from directly or indirectly bidding for, or purchasing
for any account in which it has a beneficial  interest,  any of our common stock
or any right to purchase  our common  stock,  for a period of one  business  day
before and after  completion of its  participation in the distribution (we refer
to that time period as the "Distribution Period").


                                       20

<PAGE>



         During the  Distribution  Period,  Regulation  M prohibits  the selling
stockholders and any other persons engaged in the Distribution  from engaging in
any  stabilizing  bid or  purchasing  our common stock except for the purpose of
preventing  or retarding a decline in the open market price of our common stock.
No such person may effect any stabilizing transaction to facilitate any offering
at the market.  Inasmuch  as the selling  stockholders  will be  reoffering  and
reselling  our common  stock at the market,  Regulation  M  prohibits  them from
effecting any  stabilizing  transaction  in  contravention  of Regulation M with
respect to our common stock.

         The selling stockholders may be entitled, under agreements entered into
with us, to  indemnification  against  liabilities  under the  Securities Act of
1933, the Securities Exchange Act of 1934 and otherwise.


                                  LEGAL MATTERS

         Warshaw Burstein Cohen  Schlesinger & Kuh, LLP will give its opinion on
the validity of the common  stock.  As of the date of this  Prospectus,  certain
partners of such firm  beneficially  own an  aggregate of 1,200 shares of common
stock.


                                     EXPERTS

         Our consolidated  financial statements as of June 30, 1998 and 1997 and
for each of the years in the  three-year  period  ended June 30,  1998 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.


                                       21

<PAGE>



                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

Item 14.   Other Expenses of Issuance and Distribution.

         The following is an itemized  statement of the estimated amounts of all
expenses  payable by the  Company in  connection  with the  registration  of the
Shares:

SEC registration fee.............................................     $    8,601
Nasdaq National Market listing fee...............................         17,500
Legal fees and expenses..........................................        100,000
Accounting fees and expenses.....................................         20,000
Miscellaneous expenses...........................................          3,899
                                                                      ----------

         Total  .................................................       $150,000
                              -------------------




Item 15.   Indemnification of Directors and Officers.

                  The Delaware General  Corporation Law provides,  in substance,
that Delaware corporations shall have the power, under specified  circumstances,
to indemnify their directors,  officers, employees and agents in connection with
actions  or suits by or in the right of the  corporation,  by reason of the fact
that they were or are such directors,  officers,  employees and agents,  against
expenses  (including  attorneys'  fees) and,  in the case of  actions,  suits or
proceedings brought by third parties,  against judgment,  fines and amounts paid
in  settlement  actually and  reasonably  incurred in any such  action,  suit or
proceeding.

                  The Company's  Certificate  of  Incorporation  provides that a
director shall not be personally  liable to the Company or its  stockholders for
monetary damages for breach of fiduciary duty as a director except for liability
(i)  for  breach  of the  director's  duty  of  loyalty  to the  Company  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's Bylaws also provide
that the Company may indemnify its directors, officers and legal representatives
to the fullest extent  permitted by Delaware law against all awards and expenses
(including attorneys' fees).

Item 16.   Exhibits.

Exhibit No.  Description

    4.1     -        Securities Purchase Agreement, dated as of December 9 1998,
                     by  and  among  the Company and the investors named therein
                     (incorporated  by  reference to Exhibit 10.1 to the Current
                     Report  on  Form 8-K,  filed by the Company on December 15,
                     1998).

    4.2     -        Registration Rights Agreement, dated as of December 9,1998,
                     by  and  among  the Company and the investors named therein
                     (incorporated  by  reference to Exhibit 10.2 to the Current
                     Report  on  Form  8-K, filed by the Company on December 15,
                     1998).

    4.3     -        Certificate  of  Designations,  Preferences  and  Rights of
                     Series  F  Convertible  Preferred  Stock  (incorporated  by
                     reference to Exhibit 3.1 to the Current Report on Form 8-K,
                     filed by the Company on December 15, 1998).

    5       -        Opinion of Warshaw Burstein Cohen Schlesinger & Kuh, LLP.



<PAGE>



   23.1     -        Consent of KPMG Peat Marwick LLP.

   23.2     -        Consent  of  Warshaw  Burstein Cohen Schlesinger & Kuh, LLP
                     (included in their opinion filed as Exhibit 5).

   24       -        Power of Attorney (included on page II-4).


Item 17.   Undertakings.

         The Company hereby  undertakes  that,  for purposes of determining  any
liability under the Securities Act of 1933, each filing of the Company's  annual
report pursuant to section 13(a) or section 15(d) of the Securities Exchange Act
of 1934 (and, where applicable, each filing of an employee benefit plan's annual
report pursuant to section 15(d) of the Securities Exchange Act of 1934) that is
incorporated by reference in the registration  statement shall be deemed to be a
new registration  statement relating to the securities offered therein,  and the
offering of such  securities at that time shall be deemed to be the initial bona
fide offering thereof.

         The Company undertakes that it will:

                  (1)  File,  during  any  period  in which it  offers  or sells
         securities,  a post-effective  amendment to this registration statement
         to:

                           (i)  Include any prospectus required by section 10(a)
                               (3) of the Securities Act;

                           (ii)  Reflect in the  prospectus  any facts or events
                  which,  individually  or  together,  represent  a  fundamental
                  change in the information in the registration statement.

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

                           (iii) Include any material  information  with respect
                  to the plan of  distribution  not previously  disclosed in the
                  registration   statement  or  any  material  changes  to  such
                  information in the registration statement.

                  provided,  however, that the Company does not need to give the
         statements  in paragraph  (a)(1)(i) and  (a)(1)(ii) if the  information
         required in a  post-effective  amendment is  incorporated  by reference
         from periodic reports filed by the Company under the Exchange Act.

                  (2) For determining  liability under the Securities Act, treat
         each  post-effective  amendment as a new registration  statement of the
         securities offered,  and the offering of the securities at that time to
         be the initial bona fide offering.

                  (3)  File  a   post-effective   amendment   to   remove   from
         registration any of the securities that remain unsold at the end of the
         offering.

         Insofar as indemnification for liabilities arising under the Securities
Act of 1933 (the "Act") may be permitted to directors,  officers and controlling
persons of the Company pursuant to the foregoing provisions,  or otherwise,  the
Company 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.


                                      II-2

<PAGE>



         In the event that a claim for indemnification  against such liabilities
(other  than the  payment  by the  Company  of  expenses  incurred  or paid by a
director, officer or controlling person of the Company 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
Company  will,  unless in the opinion of its counsel the matter has been settled
by  controlling  precedent,  submit to a court of appropriate  jurisdiction  the
question  whether  such  indemnification  by  it is  against  public  policy  as
expressed in the Securities  Act and will be governed by the final  adjudication
of such issue.

                                      II-3

<PAGE>



                                   SIGNATURES

         Pursuant  to the  requirements  of the  Securities  Act  of  1933,  the
Registrant  certifies that it has reasonable  grounds to believe it meets all of
the  requirements  for filing on Form S-3 and has duly caused this  Registration
Statement  to be  signed  on its  behalf  by  the  undersigned,  thereunto  duly
authorized,  in the City of Morris Plains,  State of New Jersey, on December 29,
1998.

                               IMMUNOMEDICS, INC.


                                                      By: /s/ Robert J. DeLuccia
                                                              Robert J. DeLuccia
                                           President and Chief Executive Officer
                                                   (Principal Executive Officer)

         Each person whose  signature  appears  below  constitutes  and appoints
David M.  Goldenberg,  Robert J. DeLuccia and Kevin Brophy and each of them, his
or her true and lawful  attorney-in-fact,  with full power of  substitution  and
resubstitution,  for him or her and in his or her name,  place and stead, in any
and all  capacities  to sign any and all  amendments,  including  post-effective
amendments,  to this  Registration  Statement,  and to file the  same,  with all
exhibits  thereto,  and  other  documents  in  connection  therewith,  with  the
Securities and Exchange  Commission  under the  Securities  Act of 1933,  hereby
ratifying and confirming all that said  attorneys-in-fact  or  substitutes,  may
lawfully do or cause to be done by virtue thereof.

         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.

Dated:
December 29, 1998                                        /s/ David M. Goldenberg
                   -------------------------------------------------------------
                                      David M. Goldenberg, Chairman of the Board
                                      and a Director


December 29, 1998                                         /s/ Robert J. DeLuccia
                   -------------------------------------------------------------
                                  Robert J. DeLuccia, President, Chief Executive
                              Officer and Director (Principal Executive Officer)

December 29, 1998                                       W. Robert Friedman, Jr.,
                   -------------------------------------------------------------
                                               W. Robert Friedman, Jr., Director


December 29, 1998                                            /s/ Marvin E. Jaffe
                   -------------------------------------------------------------
                                                       Marvin E. Jaffe, Director


December 29, 1998                                           Richard R. Pivirotto
                   -------------------------------------------------------------
                                                  Richard R. Pivirotto, Director


December 29, 1998                                        /s/ Richard C. Williams
                   -------------------------------------------------------------
                                                   Richard C. Williams, Director


December 29, 1998                                          /s/ Kevin X.F. Brophy
                   -------------------------------------------------------------
                                  Kevin X.F. Brophy, Vice President, Finance and
                           Administration and Chief Financial Officer (Principal
                                               Financial and Accounting Officer)


                                      II-4

<PAGE>



                                                                       EXHIBIT 5
                             WARSHAW BURSTEIN COHEN
                             SCHLESINGER & KUH, LLP
                                555 Fifth Avenue
                            New York, New York 10017
                            Telephone: (212) 984-7700
                            Facsimile: (212) 972-9150

                                                               December 29, 1998


Immunomedics, Inc.
300 American Road
Morris Plains, New Jersey 07950

Gentlemen and Ladies:

         You have requested our opinion,  as counsel for  Immunomedics,  Inc., a
Delaware  corporation  (the  "Company"),  in  connection  with the  Registration
Statement on Form S-3 (the "Registration Statement") under the Securities Act of
1933  (the  "Act"),  filed by the  Company  with  the  Securities  and  Exchange
Commission (the "Commission").

         The  Registration  Statement  relates to the  offering  by the  Selling
Stockholder of up to 10,000,000  shares of the Company's common stock,  $.01 par
value  per  share  (the  "Common  Stock"),  issuable  from  time to  time,  upon
conversion of shares of the Company's Series F Convertible  Preferred Stock (the
"Series F Stock").

         In the  preparation  of our opinion,  we have examined (1) the Restated
Certificate of Incorporation of the Company, as amended to date, (2) the By-Laws
of the  Company,  in effect on the date  hereof,  (3) minutes of meetings of the
Company's Board of Directors,  as made available to us by executive  officers of
the Company, (4) a certificate from an executive officer of the Company, (5) the
Registration Statement,  and (6) the Securities Purchase Agreement,  dated as of
December  9, 1998 (the  Agreement"),  including  the  exhibits  incorporated  by
reference therein.  In our examinations,  we have assumed the genuineness of all
signatures,  the authenticity of all documents submitted to us as originals, the
conformity  to the  originals of all  documents  submitted  to us as  certified,
photostatic or conformed  copies,  and the  authenticity of the originals of all
such latter documents.

         Based upon such  examination,  we are of the  opinion  that the Shares,
when issued and delivered in accordance with the terms of the Agreement, and the
Certificate of Designations,  Preferences and Rights of the Series F Stock, will
be validly issued, fully paid and non-assessable.

         We hereby  consent  to the  filing of our  opinion as an exhibit to the
Registration Statement and to the reference to our firm under the caption "Legal
Matters" in the prospectus included in the Registration  Statement. In so doing,
we do not admit that we are in the category of persons whose consent is required
under  Section  7 of the Act or the  rules  and  regulations  of the  Commission
promulgated thereunder.

         Certain  partners of our Firm  beneficially  own 1,200 shares of Common
Stock.



                                                                Sincerely yours,



                                                          WARSHAW BURSTEIN COHEN
                                                          SCHLESINGER & KUH, LLP


MDS/HMC

                                       E-1

<PAGE>




                                                                    EXHIBIT 23.1





                       CONSENT OF INDEPENDENT ACCOUNTANTS

The Board of Directors
Immunomedics, Inc.

We consent to the use of our report  incorporated herein by reference and to the
reference to our firm under the heading "Experts" in the Prospectus.


                                                           KPMG PEAT MARWICK LLP



Short Hills, New Jersey
December 29, 1998


                                       E-2

<PAGE>


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