ENZON INC
10-K, 1998-09-28
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

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

                                    FORM 10-K

                Annual Report Pursuant to Section 13 or 15(d) of
                       The Securities Exchange Act of 1934

                             -----------------------
                                                             Commission
     For the fiscal year ended June 30, 1998                 File Number 0-12957


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

              Delaware                                            22-2372868
  (State or other jurisdiction of                             (I.R.S. Employer
  incorporation or organization)                             Identification No.)

  20 Kingsbridge Road, Piscataway, New Jersey                       08854
  (Address of principal executive offices)                        (Zip Code)

  Registrant's telephone number, including area code: (732) 980-4500

  Securities registered pursuant to Section 12(b) of the Act: None

  Securities registered pursuant to Section 12(g) of the Act:

                          Common Stock, $.01 par value
                                (Title of class)

     Indicate  by check mark  whether the  registrant  (1) has filed all reports
required to be filed by Section 13 or 15(d) of the  Securities  Exchange  Act of
1934  during  the  preceding  12 months  (or for such  shorter  period  that the
registrant was required to file such reports),  and (2) has been subject to such
filing requirements for the past 90 days. Yes _X_ No___

     Indicate by check mark if disclosure of delinquent  filers pursuant to item
405 of Regulation S-K is not contained herein, and will not be contained, to the
best of registrant's  knowledge,  in definitive proxy or information  statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K. _X_

     The aggregate  market value of the Common Stock,  par value $.01 per share,
held by  non-affiliates  based upon the  reported  last sale price of the Common
Stock on September 11, 1998 was approximately  $150,277,000.  There is no market
for the Series A Cumulative Convertible Preferred Stock, the only other class of
voting stock.

     As of September 11, 1998, there were 35,359,384 shares of Common Stock, par
value $.01 per share, outstanding.

     The Index to Exhibits appears on page 28.

                       Documents Incorporated by Reference

     The  registrant's  definitive  Proxy  Statement  for the Annual  Meeting of
Stockholders  scheduled  to be held on  December  1, 1998,  to be filed with the
Commission  not later than 120 days after the close of the  registrant's  fiscal
year, has been  incorporated  by reference,  in whole or in part,  into Part III
Items 10, 11, 12 and 13 of this Annual Report on Form 10-K.


<PAGE>


                                   ENZON, INC.

                          1998 Form 10-K Annual Report

                                TABLE OF CONTENTS

                                                                           Page
                                                                           ----

                                     PART I
Item 1.   Business                                                           3
Item 2.   Properties                                                        19
Item 3.   Legal Proceedings                                                 19
Item 4.   Submission of Matters to a Vote of
                        Security Holders                                    20

                                     PART II

Item 5.   Market for the Registrant's Common Equity and
                        Related Stockholder Matters                         21
Item 6.   Selected Financial Data                                           22
Item 7.   Management's Discussion and Analysis of Financial
                        Condition and Results of Operations                 22
Item 8.   Financial Statements and Supplementary Data                       25
Item 9.   Changes in and Disagreements With Accountants
                        on Accounting and Financial Disclosure              26

                                    PART III

Item 10.  Directors and Executive Officers of the Registrant                27
Item 11.  Executive Compensation                                            27
Item 12.  Security Ownership of Certain Beneficial Owners
                        and Management                                      27
Item 13.  Certain Relationships and Related Transactions                    27

                                     PART IV

Item 14.  Exhibits, Financial Statement Schedules and
                        Reports on Form 8-K                                 28

                                   ----------


     The following  trademarks  and service marks appear in this Annual  Report:
     ADAGEN(R)  and  ONCASPAR(R)  are  registered  trademarks  of  Enzon,  Inc.;
     PROTHECAN(TM)  is a  trademark  of  Enzon,  Inc.;  SCA(R)  is a  registered
     trademark of Enzon Labs Inc.;  Elspar(R) is a registered trademark of Merck
     &  Co.,  Inc;   INTRON(R)  A  registered   trademarks  of   Schering-Plough
     Corporation;  Hycamtin(TM)  is  a  trademark  of  SmithKline  Beecham  plc;
     Camptosar(R)   is   a   registered   trademark   of   Rhone-Poulenc   Rorer
     Pharmaceuticals  Inc.;  Roferon(R) is a registered trademark of Hoffmann-La
     Roche. REBETOL(R) is a registered trademark of ICN Pharmaceuticals, Inc.


                                       2
<PAGE>


                                     PART I

Item 1. BUSINESS

Overview

     Enzon, Inc. ("Enzon" or the "Company") is a biopharmaceutical  company that
develops,  manufactures and markets enhanced  therapeutics for  life-threatening
diseases  through  the  application  of its two  proprietary  technologies:  (i)
polyethylene glycol ("PEG")  Modification and (ii) single-chain  antigen-binding
SCA(R) proteins. Enzon is focusing its research activities primarily in the area
of oncology and is applying its  proprietary  technologies to compounds of known
therapeutic efficacy in order to enhance the performance of these compounds. The
Company is commercializing  its proprietary  technologies by developing products
internally and in cooperation with strategic partners.  To date, the Company and
its partners have  successfully  commercialized  two products,  ONCASPAR(R)  and
ADAGEN(R)  (described  below).  The Company  currently  has two  products  under
development  internally and has established more than 20 strategic alliances and
license  relationships  for the  development  of  products  using the  Company's
proprietary technologies.  The Company believes that its partners are dedicating
substantial  resources to the development of products which incorporate  Enzon's
proprietary technologies. These efforts include the development of PEG-Intron A,
a PEG  modified  version of  Schering-Plough  Corporation's  ("Schering-Plough")
product,   INTRON(R)   A   (interferon   alfa  2b),   a   genetically-engineered
anticancer-antiviral  drug, for which  Schering-Plough  is currently  conducting
Phase III clinical trials.

PEG Technology

     The  PEG  process   involves   chemically   attaching   PEG,  a  relatively
non-reactive  and non-toxic  polymer,  to proteins,  chemicals and certain other
pharmaceuticals  for the purpose of enhancing their  therapeutic value (the "PEG
Process" or "PEG  Modification").  The  attachment  of PEG helps to disguise the
compound  and reduce  the  recognition  of the  compound  by the immune  system,
generally  lowering  potential  immunogenicity  and  extending  the life of such
compounds  in the  circulatory  system.  The  PEG  Process  also  increases  the
solubility of the modified  compound  which  enhances the delivery of the native
compound.  To date, Enzon's  commercialized  products are PEG modified proteins.
Through  enhancements,  Enzon is  seeking  to apply its PEG  technology  to more
traditional organic compounds.

     The Company has made significant  improvements to the original PEG Process,
collectively referred to as "Second Generation PEG Technology",  and has applied
for  and  received  certain  patents  covering  some  improvements.  One  of the
components of the Second  Generation PEG  Technology is new linker  chemistries;
the chemical binding of PEG to unmodified proteins. These new linkers provide an
enhanced  binding of the PEG to the protein  resulting in a more stable compound
with increased  circulation life and may result in more activity of the modified
protein.

     The Company also has developed a Third  Generation PEG  Technology  that is
designed to enable the  technology to be expanded to certain  organic  compounds
and would  give such PEG  modified  compounds  "Pro  Drug"  attributes.  This is
accomplished  by attaching PEG to a compound by means of a covalent bond that is
designed to break down over time, thereby releasing the active ingredient in the
proximity  of  the  targeted  tissues.   The  Company  believes  that  the  "Pro
Drug/Transport Technology" has much broader usefulness in that it can be applied
to a wide  range  of  small  molecules,  such  as  cancer  chemotherapy  agents,
antibiotics,  anti-fungals  and  immunosuppressants,  as well as to proteins and
peptides,  including  enzymes  and  growth  factors,  although  there  can be no
assurance that such application will result in safe, effective,  or commercially
viable pharmaceutical products.

Marketed PEG Products

     The Company has received marketing approval from the United States Food and
Drug  Administration  ("FDA") for two First Generation PEG technology  products:
(i) ONCASPAR, the PEG formulation of L-asparaginase, for the indication of acute
lymphoblastic leukemia ("ALL") in patients who are hypersensitive to


                                       3
<PAGE>


native forms of L-asparaginase and (ii) ADAGEN, the PEG formulation of adenosine
deaminase  ("ADA"),  the first  successful  application  of  enzyme  replacement
therapy  for an  inherited  disease  to  treat a rare  form of  Severe  Combined
Immunodeficiency Disease ("SCID"), commonly known as the "Bubble Boy Disease."

     ADAGEN is marketed by Enzon on a worldwide  basis.  ONCASPAR is marketed in
the U.S. and Canada by Rhone-Poulenc Rorer Pharmaceuticals,  Inc. and certain of
its  affiliated  entities  ("RPR")  and in Europe by Medac GmbH  ("Medac").  The
Company has also granted  exclusive  licenses to RPR to sell  ONCASPAR in Mexico
and the Pacific Rim region,  specifically,  Australia,  New Zealand, Japan, Hong
Kong,  Korea,  China,  Taiwan,  Philippines,   Indonesia,  Malaysia,  Singapore,
Thailand and Viet Nam, (the "Pacific Rim"). The Company is entitled to royalties
on the sales of  ONCASPAR  in North  America  by RPR,  as well as  manufacturing
revenue from the production of ONCASPAR.  The Company's  agreements with RPR for
the Pacific Rim and with Medac  require the partners to purchase  ONCASPAR  from
the Company at a set price which increases over the term of the  agreements.  In
addition,  the agreements provide for minimum purchase  quantities.  The Company
manufactures  both  ADAGEN  and  ONCASPAR  in its South  Plainfield,  New Jersey
facility.

PEG Products under Development

     The Company  currently has three products that utilize its Second and Third
Generation  PEG  Technology  in clinical and  preclinical  trials.  The first is
PEG-Intron  A, a PEG modified  version of  Schering-Plough's  product,  INTRON A
(interferon alfa 2b), a  genetically-engineered  anticancer-antiviral  drug, for
which  Schering-Plough is currently conducting Phase III clinical trials for use
in the treatment of hepatitis C and malignant melanoma. The second product under
development   is   PEG-hemoglobin,   a   proprietary   bovine   hemoglobin-based
oxygen-carrier  being  developed  for the  radiosensitization  of solid  hypoxic
tumors,  for which the Company recently concluded a Phase Ib clinical trial. The
third product under  development is  PROTHECAN(TM),  a  PEG-modified  version of
camptothecin,  a potent topoisomerase-1  inhibitor,  for use in certain cancers,
which is currently in preclinical studies.

     PEG-Intron   A  was   developed   by  the  Company  in   conjunction   with
Schering-Plough  to have longer  lasting  properties  and the  potential  for an
enhanced  safety  profile   compared  to  currently   marketed  forms  of  alpha
interferon.  PEG-Intron A is currently in Phase III clinical trials in hepatitis
C patients in the United  States and Europe and has recently  entered  Phase III
clinical trials for malignant melanoma.  Other indications being pursued include
chronic  myelogenous  leukemia,  solid tumors, as well as combination  treatment
with Schering-Plough's product, REBETOL(R), for the treatment of hepatitis C. It
is expected that PEG-Intron A will be administered once a week,  compared to the
current  regimen for unmodified  INTRON A of three times a week.  Moreover,  the
Company  believes that  PEG-Intron A may provide an improved side effect profile
and an improved therapeutic index for hepatitis C patients.

     Pursuant to an  agreement  with  Schering-Plough,  the Company will receive
royalties on worldwide sales of PEG-Intron A, as well as milestone payments. The
Company also has the option to be the exclusive manufacturer of PEG-Intron A for
the U.S. market.  Schering-Plough's  sales of INTRON A were  approximately  $598
million in 1997 for all approved  indications.  The  worldwide  market for alpha
interferon  products is estimated to be in excess of $1 billion for all approved
indications.  The Company's  PEG  technology  patents  which cover  PEG-Intron A
extend until at least 2015.

SCA Technology

     The  Company  also  has an  extensive  licensing  program  for  its  second
proprietary  technology,  SCA protein  technology.  SCA proteins are genetically
engineered  proteins designed to overcome the problems  hampering the diagnostic
and therapeutic use of conventional  monoclonal antibodies.  Preclinical studies
have shown that certain SCA proteins  target and  penetrate  tumors more readily
than  conventional  monoclonal  antibodies.  In  addition  to these  advantages,
because SCA proteins are developed at the gene level, they are better suited for
targeted delivery of gene therapy vectors;  also fully-human SCA proteins can be
isolated  directly,  with no  need  for  costly  "humanization"  procedures.  In
addition,  many gene therapy  methods  require  that  proteins be produced in an
active


                                       4
<PAGE>


form inside cells. SCA proteins can be produced through intracellular expression
(inside cells) more readily than monoclonal antibodies.

     Currently,  there are ten SCA proteins that have either completed or are in
Phase I or II clinical trials by various corporations and institutions. Three of
these corporations and institutions have existing licenses with the Company with
respect to SCA  proteins and others are  expected to require  similar  licenses.
Some of the areas being explored are cancer therapy,  cardiovascular indications
and AIDS.  The  Company has granted  non-exclusive  SCA  licenses to more than a
dozen  companies,  including  Bristol-Myers  Squibb Company,  Baxter  Healthcare
Corporation,  Eli Lilly & Co.,  Alexion  Pharmaceuticals  Inc.,  and the Gencell
division  of  RPR.  These  licenses  generally  provide  for  upfront  payments,
milestone payments and royalties on sales of FDA approved products.

     Information  contained in this Annual Report,  including without limitation
the discussion of year 2000 compliance in "Management's  Discussion and Analysis
of Financial  Condition and Results of  Operations",  contains  "forward-looking
statements"  which can be identified by the use of  forward-looking  terminology
such as "believes,"  "expects,"  "may," "will," "should" or "anticipates" or the
negative thereof or other variations  thereon or comparable  terminology,  or by
discussions  of  strategy.  No  assurance  can be given that the future  results
covered by the  forward-looking  statements  will be  achieved.  The matters set
forth in Exhibit  99.0 hereto and  elsewhere  in this Annual  Report  constitute
cautionary  statements  identifying  important  factors  with  respect  to  such
forward-looking  statements,  including  certain risks and  uncertainties,  that
could cause actual results to vary materially from the future results  indicated
in such  forward-looking  statements.  Other  factors  could also  cause  actual
results  to  vary  materially   from  the  future  results   indicated  in  such
forward-looking statements.

Products on the Market

     The Company has received U.S. marketing approval from the FDA for two First
Generation PEG Technology  products,  ONCASPAR and ADAGEN.  The Company received
approval  from the FDA for  ONCASPAR  in  February  1994 and for ADAGEN in March
1990.

ONCASPAR

     ONCASPAR,  the  enzyme  L-asparaginase  modified  by the  PEG  Process,  is
currently  approved  in the  United  States,  Canada  and  Germany,  for  use in
conjunction  with other  chemotherapeutics  to treat  patients  with ALL who are
hypersensitive  (allergic)  to  native  (unmodified)  forms  of  L-asparaginase.
ONCASPAR  is also  approved  in Russia for  therapeutic  use in a broad range of
cancers.  ONCASPAR is  marketed  in the U.S.  and Canada by RPR and in Europe by
MEDAC.

     L-asparaginase  is an enzyme which  depletes the amino acid  asparagine,  a
non-essential  amino acid upon which  certain  leukemic  cells are dependent for
survival.  Accordingly,  the depletion of plasma asparagine  levels  selectively
starves  these  leukemic  cells.  L-asparaginase  is  a  component  of  standard
pediatric  ALL  remission  induction  therapies.  Unmodified  L-asparaginase  is
currently marketed in the U.S. as Elspar(R).

     The  therapeutic  value of  unmodified  L-asparaginase  is  limited  by two
inherent  aspects of the enzyme.  First, its short half-life in blood (less than
1.5 days) requires  every-other-day  injections,  causing significant discomfort
and inconvenience to patients.  Secondly, the enzyme's non-human source makes it
inherently  immunogenic,  resulting in a high  incidence of allergic  reactions,
some  of  which  may  be  severe,   necessitating  the   discontinuance  of  the
L-asparaginase therapy.

     Through  PEG  Modification,  Enzon  believes  ONCASPAR  offers  significant
therapeutic   advantages   over  unmodified   L-asparaginase.   ONCASPAR  has  a
significantly  increased  half-life in blood (greater than five days),  allowing
every-other-week administration,  making its use more tolerable to patients than
unmodified


                                       5
<PAGE>


L-asparaginase.  PEG  Modification  also disguises the enzyme's  foreign nature,
generally reducing its immunogenicity,  and enabling its use in patients who are
allergic to unmodified L-asparaginase.

     In addition to pediatric ALL, native L-asparaginase sold by other companies
is used in Europe to treat adult ALL and non-Hodgkins lymphoma. RPR is currently
conducting clinical trials to expand the use of ONCASPAR in ALL treatment beyond
the  hypersensitive  label  indication,  and in  other  additional  indications,
including  non-Hodgkin's  lymphoma.  These indications  represent larger patient
populations and revenue potential than the limited current approved  indication.
The Company expects MEDAC to initiate similar trials in the near future.

     RPR Agreements

     ONCASPAR  was launched in the United  States by RPR during March 1994.  The
Company has granted RPR an  exclusive  license (the  "Amended  RPR U.S.  License
Agreement")   in  the   United   States   to  sell   ONCASPAR,   and  any  other
PEG-asparaginase  product (the  "Product")  developed by Enzon or RPR during the
term of the Amended RPR U.S. License Agreement.  Under this agreement, Enzon has
received  licensing  payments  totaling  $6,000,000  and is  entitled  to a base
royalty of 23.5% until 2008 on net sales of ONCASPAR up to agreed upon  amounts.
Additionally,  the  Amended  RPR U.S.  License  Agreement  provides  for a super
royalty of 43.5% until 2008 on net sales of ONCASPAR which exceed certain agreed
upon amounts,  with the limitation that the total royalties  earned for any such
year shall not exceed 33% of net sales. The Amended RPR U.S.  License  Agreement
also  provides  for a payment  of  $3,500,000  in advance  royalties,  which was
received in January 1995.

     The payment of base  royalties to Enzon under the Amended RPR U.S.  License
Agreement will be offset by an original credit of $5,970,000,  which  represents
the royalty advance plus  reimbursement  of certain amounts due to RPR under the
original RPR U.S. License Agreement and interest  expense.  Super royalties will
be paid to the Company when earned.  The royalty advance is shown as a long term
liability,  with the corresponding  current portion included in accrued expenses
on the  Consolidated  Balance  Sheets as of June 30, 1998 and 1997.  The royalty
advance will be reduced as base royalties are recognized under the agreement.

     The  Amended  RPR U.S.  License  Agreement  prohibits  RPR from  selling  a
competing PEG-asparaginase product anywhere in the world during the term of such
agreement and for five years  thereafter.  The agreement  terminates in December
2008, subject to early termination by either party due to a default by the other
or by RPR  at any  time  upon  one  year's  prior  notice  to  Enzon.  Upon  any
termination all rights under the Amended RPR U.S.  License  Agreement  revert to
Enzon.

     During  December  1997,  RPR  received  marketing  approval for ONCASPAR in
Canada. Under a separate license, the Company granted RPR the exclusive right to
sell ONCASPAR in Canada and Mexico.  These agreements  provide for RPR to obtain
marketing  approval  of  ONCASPAR  in Canada and  Mexico and for the  Company to
receive  royalties on sales of ONCASPAR in these  countries,  if any. A separate
supply  agreement  with RPR  requires  RPR to  purchase  from Enzon all  Product
requirements for sales in North America.

     During May 1998, the Company entered into an additional  license  agreement
with  RPR for the  Pacific  Rim.  The  agreement  provides  for RPR to  purchase
ONCASPAR  for the  Pacific Rim from the  Company at certain  established  prices
which increase over the ten year term of the agreement. Under the agreement, RPR
is  responsible  for  obtaining  additional  approvals  and  indications  in the
licensed   territories.   The  agreement  also  provides  for  minimum  purchase
requirements for the first four years of the agreement.


                                       6
<PAGE>


     MEDAC Agreement

     The Company has also granted an exclusive license to MEDAC to sell ONCASPAR
in Europe and Russia. The agreement provides for MEDAC to purchase ONCASPAR from
the Company at certain  established  prices which increase over the initial five
year  term of the  agreement.  Under the  agreement,  MEDAC is  responsible  for
obtaining  additional  approvals and  indications  in the licensed  territories,
beyond the currently approved  hypersensitive  indication in Germany.  Under the
agreement, MEDAC is required to meet certain minimum purchase requirements.

ADAGEN

     ADAGEN,  the Company's first FDA approved product,  is currently being used
to treat 53 patients in seven countries.  ADAGEN represents the first successful
application of enzyme replacement therapy for an inherited disease.  ADAGEN, the
enzyme ADA modified  through the PEG Process,  was  developed by the Company for
the treatment of ADA  deficiency  associated  with SCID,  commonly  known as the
"Bubble Boy  Disease".  SCID is a  congenital  disease  that results in children
being born without fully functioning immune systems, leaving them susceptible to
a wide range of infectious  diseases.  Injections of unmodified ADA would not be
effective  because of its short  circulating life (less than thirty minutes) and
the  potential  for  immunogenic  reactions  to  a  bovine-sourced  enzyme.  The
attachment  of PEG to ADA allows ADA to achieve its full  therapeutic  effect by
increasing  its  circulating  life  and  masking  the ADA to  avoid  immunogenic
reactions.

     ADAGEN is being marketed on a worldwide basis and sold in the United States
by Enzon.  Distribution  of ADAGEN in  Europe  and Japan is being  handled  by a
European  firm.  Enzon  believes  many  newborns  with   ADA-deficient  SCID  go
undiagnosed  and is therefore  focusing its marketing  efforts for ADAGEN on new
patient  identification.  The Company's  marketing  efforts include  educational
presentations  and  publications  designed  to  encourage  early  diagnosis  and
subsequent ADAGEN treatment.

     Sales of ADAGEN for the fiscal  years  ended June 30,  1998,  1997 and 1996
were $10,107,000, $8,935,000 and $8,696,000,  respectively.  Currently, the only
alternative  to ADAGEN  treatment  is a well  matched  bone  marrow  transplant.
Patients  who are unable to  receive  successful  bone  marrow  transplants  are
expected to require  ADAGEN  injections  for the rest of their  lives.  Sales of
ADAGEN  are  expected  to  continue  to be  limited  due  to the  small  patient
population worldwide.

Research and Development

     The Company's  primary source of new products is its internal  research and
development  activities.  Research and development expenses for the fiscal years
ended June 30, 1998, 1997 and 1996 were approximately $8,654,000, $8,520,000 and
$10,124,000, respectively.

     The  Company's  research  and  development  activities  during  fiscal 1998
concentrated   primarily  on  the  continued   development  of   PEG-hemoglobin,
preclinical work on  PEG-camptothecin,  the Company's first product to use Third
Generation Pro Drug/Transport Technology, and continued research and development
of the Company's proprietary technologies.

Technologies and Capabilities

     The Company's  technologies  are focused in the area of drug delivery.  The
Company's   PEG   Modification   technology  is  able  to  lower  the  potential
immunogenicity,  extend  the  circulating  life and  enhance  solubility  of the
modified  compound.   The  Company  believes  its  SCA  and  Pro  Drug/Transport
Technologies  may be able to achieve  targeting  of the  modified  compound to a
desired site in the body.  It is believed that this will result in less toxicity
to  the  surrounding  tissue  and  increased  therapeutic  effect  due to a high
concentration of the compound in the targeted


                                       7
<PAGE>


tissue.  The Company is currently  applying its  technologies  to compounds with
known therapeutic efficacy that suffer from delivery problems.  This encompasses
undeveloped compounds as well as products already on the market.

PEG Modification

     Enzon's  proprietary  technology,  PEG  Modification  or the  PEG  Process,
involves chemically  attaching PEG to therapeutic proteins or chemical compounds
that are difficult to deliver.  PEG is a relatively  non-reactive  and non-toxic
polymer that is used in many food and pharmaceutical products. Attachment of PEG
disguises the protein and reduces its recognition by the immune system,  thereby
generally lowering potential  immunogenicity and extending its circulating life,
in some cases from minutes to days. Chemical compounds have an added drawback in
that they are typically  water-insoluble,  which makes delivery difficult, or in
some cases,  impossible.  The Company believes the attachment of PEG to chemical
substances  not  only  disguises  the  chemical,   thereby  lowering   potential
immunogenicity  and extending its circulatory  life, but also greatly  increases
the solubility of these compounds. Enzon believes that compounds modified by the
PEG Process may offer significant  advantages over their unmodified forms. These
advantages  include:  (i) extended  circulating  life, (ii) reduced incidence of
allergic  reactions,  (iii) reduced  dosages with  corresponding  lower toxicity
without diminished efficacy, (iv) increased drug stability and (v) enhanced drug
solubility.  Modification  of proteins  with the PEG Process  often causes these
proteins to have  characteristics  that significantly  improve their therapeutic
performance,  and in some cases enables proteins to be therapeutically effective
which, in their unmodified forms, have proven to be non-efficacious.

     The Company has developed proprietary know-how, collectively referred to as
Second Generation PEG Technology,  which significantly  improves the PEG Process
over that described in the original broad patent covering this technology  which
expired in late 1996. This  proprietary  know-how  enables the Company to tailor
the PEG  Process in order to produce  the  desired  results  for the  particular
substance  being  modified.   This  know-how   includes,   among  other  things,
proprietary linkers for the attachment of PEG to compounds, the selection of the
appropriate  attachment sites on the surface of the compound, and the amount and
type of PEG used. These improvements allow PEG to bind to different parts of the
molecules, which may result in more activity of the modified protein. Attachment
of PEG to the wrong site on the protein can result in a loss of its  activity or
therapeutic  effect.  The main  objective  of the  First and  Second  Generation
technology is to permanently  attach PEG to the unmodified  protein.  Currently,
there are two Second  Generation  products in clinical  trials,  including a PEG
modified version of  Schering-Plough's  INTRON A, which is in Phase III clinical
trials. See "Strategic Alliances and License Agreements - Schering". The Company
has  received  patents  for  numerous  improvements  to  the  PEG  Process.  See
"Patents".

Pro Drug/Transport Technology

     The Company  recently has developed a Third  Generation PEG technology that
gives  PEG-modified  compounds "Pro Drug"  attributes.  This is  accomplished by
attaching  PEG to a compound  by means of a covalent  bond that is  designed  to
deteriorate over time, thereby releasing the therapeutic moiety in the proximity
of  the  target  tissue.  These  attributes  could  significantly   enhance  the
therapeutic value of new chemicals, as well as drugs already marketed by others.
The Company  believes that this technology has broad  usefulness and that it can
be  applied  to a wide  range of  drugs,  such as  cancer  chemotherapy  agents,
antibiotics,  anti-fungals  and  immunosuppressants,  as well as to proteins and
peptides,  including enzymes and growth factors. The markets for these drugs and
biologicals have large potential patient populations.

     The Company is currently  applying  its Pro  Drug/Transport  Technology  to
cancer chemotherapy agents and anti-fungals.  One such compound,  a PEG-modified
version  of  camptothecin,  a topo-1  inhibitor,  is in  preclinical  studies in
preparation  for an anticipated  Investigational  New Drug  Application  ("IND")
filing during the second half of calendar year 1998.  The Company  believes that
the covalent attachment of PEG can inactivate the drug's toxic mechanisms, while
allowing the drug to circulate in the  bloodstream  for longer  periods of time,
thereby allowing the


                                       8
<PAGE>


compound to accumulate in the  proximity of the tumor site.  Preliminary  animal
studies have shown that a compound  modified with the Company's Third Generation
PEG Technology  accumulates in tumors.  The covalent bond used to attach the PEG
to the drug in the Third  Generation  Peg  Technology is designed to deteriorate
over time,  resulting in the PEG falling off and allowing the compound to resume
its activity. Animal studies conducted by the Company thus far have demonstrated
increases in the  therapeutic  index of compounds  modified by the Company's Pro
Drug/Transport  Technology.  However,  there  can  be no  assurance  that  these
advantages can be attained in humans or that drugs based on this technology will
be approved by the FDA.

     The  Company  has  several   patent   applications   relating  to  its  Pro
Drug/Transport  Technology  that have  been  issued  or are  under  review.  See
"Patents".

Single-Chain Antigen-Binding (SCA) Proteins

     Enzon's  proprietary  SCA  proteins  are  genetically  engineered  proteins
designed  to overcome  the  problems  associated  with the  therapeutic  uses of
monoclonal antibodies. SCA proteins have the binding specificity and affinity of
monoclonal antibodies,  but Enzon believes that SCA proteins offer at least five
significant  advantages over  conventional  monoclonal  antibodies:  (i) greater
tumor   penetration   for  cancer  imaging  and  therapy,   (ii)  more  specific
localization  to target sites in the body,  (iii) a significant  decrease in the
immunogenic  problems associated with monoclonals due to the SCA protein's small
size and rapid  clearance  from the body,  (iv)  easier and more cost  effective
scale-up for manufacturing and (v) enhanced  screening  capabilities which allow
for the testing of SCA proteins for desired specificities using simple screening
methods. In addition to these advantages,  because SCA proteins are developed at
the gene level,  they are better  suited for  targeted  delivery of gene therapy
vectors and fully-human SCA proteins can be isolated directly,  with no need for
costly "humanization"  procedures.  Also, many gene therapy methods require that
proteins be produced in active form inside  cells.  SCA proteins can be produced
through  intracellular  expression  (inside cells) more readily than  monoclonal
antibodies.

     The binding  specificity of SCA proteins has been demonstrated  through the
preparation  and in vitro testing of more than a dozen different SCA proteins by
Enzon. In addition, the Company, in collaboration with Dr. Jeffrey Schlom of the
Laboratory  of Tumor  Immunology  and Biology at the National  Cancer  Institute
("NCI"),  has shown in published  preclinical studies that SCA proteins localize
to specific tumors and rapidly penetrate the tumors.

     Currently,  there are ten SCA proteins that have either completed or are in
Phase I or II clinical trials by various  organizations,  including licensees of
the Company and  academic  institutions.  Some of the areas being  explored  are
cancer therapy,  cardiovascular  indications and AIDS. The Company believes that
those  organizations  who have not yet  licensed  this  technology  will have to
obtain a license from Enzon to commercialize these products, but there can be no
assurance  that this will prove to be the case.  The following are some examples
of research being conducted in the SCA area:

          Scientists  at the  University  of  Alabama  are  conducting  research
     utilizing SCA proteins  produced inside the body at the cell level, in gene
     therapy for  ovarian  cancer.  SCA  proteins  produced in an  intracellular
     environment  (inside the cell) via gene  therapy are known as  intrabodies.
     Animal data  generated  from these  studies has revealed  that SCA proteins
     produced through intracellular expression increased the response of several
     prevalent  human  cancers  (e.g.,  breast,   lung,  ovarian,   stomach)  to
     chemotherapy. A clinical protocol has been published by these investigators
     for this application.

          The Company's licensee, Alexion Pharmaceuticals, Inc. has developed an
     SCA protein  application  using a monomeric  humanized SCA protein directed
     against complement protein C5, which causes inflammation in cardiopulmonary
     bypass and myocardial  infarction patients.  Alexion's compound is designed
     to block C5  production,  which causes  inflammation.  Alexion is currently
     conducting a Phase IIb clinical trial in coronary bypass patients.  Earlier
     Phase I/II trials


                                       9
<PAGE>


     showed that the drug was well  tolerated  and showed  biological  efficacy.

          Another  application of the Company's SCA technology is in the area of
     "T-Bodies".  T-Cells are one of the body's natural  defenses against cancer
     and infections.  T-Body technology is the adding of the gene code of an SCA
     protein to a T-cell which has been  removed from the body.  The T-Cells can
     be  modified  through  recombinant  technology  to have  the SCA  receptors
     targeting a certain antigen, thereby concentrating the T-Cell on a specific
     area. Cell Genesys, an Enzon licensee, has had success in applying T-Bodies
     in preclinical studies with the CC49 SCA protein.

          SCA proteins are also being used in antibody engineering,  through the
     use  of  phage  display  library  technology,  for  isolation  of  antibody
     specificities.   Using  phage  display   technology,   it  is  possible  to
     conveniently   isolate  a  human  high-affinity  SCA  protein  specific  to
     virtually any target antigen, including anti-self specificities.  Cambridge
     Antibody   Technology  Ltd.  ("CAT"),  a  pioneer  in  the  development  of
     combinatorial  antibody libraries (the "Phage Antibody System"),  currently
     has  several   licensing   agreements   with  global   pharmaceutical   and
     biotechnology  companies  for use of this  library.  Because  CAT  licenses
     Enzon's SCA technology for this library,  Enzon should receive royalties on
     any SCA protein products developed with this technology.

     The  Company  believes  it has a dominant  patent  position  in SCA protein
technology and has received numerous  patents,  the most recent of which expires
in 2013. See "Patents".

     The Company is currently evaluating the feasibility of licensing in several
SCA protein compounds for development  internally,  in addition to licensing the
technology to other companies.  To date, the Company has granted SCA licenses to
more than a dozen companies,  including Bristol-Myers Squibb, Baxter Healthcare,
Eli  Lilly  and  RPR/Gencell.  These  licenses  generally  provide  for  upfront
payments,  milestone  payments and royalties on sales of FDA approved  products.
See "Strategic Alliances and License Agreements".

Products Under Development

     There are currently  three  products that utilize the Company's  Second and
Third  Generation PEG Technology in clinical and  preclinical  development.  The
first is  PEG-Intron  A, a PEG modified  version of  Schering-Plough's  product,
INTRON A  (interferon  alfa 2b), a  genetically-engineered  anticancer-antiviral
drug,  for which  Schering-Plough  is  currently  conducting  Phase III clinical
trials for use in the  treatment of hepatitis C and has recently  entered  Phase
III clinical trials for malignant melanona. The second product under development
is PEG-hemoglobin,  a proprietary bovine  hemoglobin-based  oxygen-carrier being
developed  for the  radiosensitization  of solid hypoxic  tumors,  for which the
Company  recently  concluded a Phase Ib clinical trial.  The third product under
development  is PROTHECAN,  a  PEG-modified  version of  camptothecin,  a potent
topoisomerase-1  inhibitor,  for use in certain  cancers,  which is currently in
preclinical studies.

PEG-Intron A

     PEG-Intron   A  was   developed   by  the  Company  in   conjunction   with
Schering-Plough  to have longer  lasting  properties  and the  potential  for an
enhanced  safety  profile   compared  to  currently   marketed  forms  of  alpha
interferon.  PEG-Intron A is currently in Phase III clinical trials in hepatitis
C patients and has recently  entered  Phase III  clinical  trials for  malignant
melanoma.  Other indications being pursued include chronic myelogenous leukemia,
solid tumors,  as well as trials of PEG-Intron A in combination with REBETOL for
hepatitis C. It is expected that PEG-Intron A will be administered  once a week,
compared to the current  regimen for unmodified  INTRON A of three times a week.
Moreover,  the Company  believes that in addition to the more convenient  dosing
schedule,  the  product  may  provide an  improved  side  effect  profile and an
improved therapeutic index for hepatitis C patients.


                                       10
<PAGE>


     Schering-Plough's sales of INTRON A were approximately $598 million in 1997
for all approved indications. The worldwide market for alpha interferon products
is  estimated to be in excess of $1 billion for all  approved  indications.  The
Company's PEG technology  patents which cover PEG-Intron A extend until at least
2015.

Hemoglobin-Based Oxygen-Carrier

     The Company is  currently  developing  a  hemoglobin-based  oxygen-carrier,
PEG-hemoglobin,  for use as a  radiosensitizer,  in  conjunction  with radiation
treatment of solid hypoxic  tumors.  Over the last three years,  the Company has
focused its  development on those  indications  for which donated whole blood is
not effective.  This is due to the relative safety, adequate supply and low cost
of the current donated blood supply.

     Preclinical  studies conducted at Enzon, the University of Wisconsin School
of  Veterinary  Medicine  and  Dana  Farber  Cancer  Institute,   indicate  that
PEG-hemoglobin  may be useful  in  treating  solid  tumors  which are  generally
hypoxic or under-oxygenated.  These studies suggest that PEG-hemoglobin delivers
oxygen to solid  hypoxic  tumors,  thereby  enhancing  the effects of  radiation
therapy  and  significantly  decreasing  the size of these  tumors.  Preclinical
studies at Dana Farber Cancer Institute have suggested that  PEG-hemoglobin  may
also sensitize solid hypoxic tumors to chemotherapy.

     The Company has  recently  concluded a Phase Ib,  multi-dose,  multi-center
clinical  trial  of  PEG-hemoglobin  in  cancer  patients  receiving   radiation
treatment. Patients received once-a-week infusions of PEG-hemoglobin followed by
five days of  radiation  treatment.  The  protocol for this study called for the
regimen to be repeated for three weeks. The primary purpose of this trial was to
evaluate  safety  related to  multiple  doses of  PEG-hemoglobin  and  radiation
therapy.  The trial  demonstrated  that the compound  was well  tolerated by the
majority of the 34 patients.  The patients in this trial  received  three weekly
infusions  at doses  ranging  from  2ml/kg to  8ml/kg.  The 8ml/kg  exceeds  the
expected efficacious dose based on the Company's  preclinical animal studies. It
is estimated that approximately  800,000 cases of solid hypoxic tumors,  such as
head and neck, lung, mammary, colon, prostate, bladder, fibrous histiocytoma and
glioma are diagnosed each year in the United States.

     The  Company   believes  that  one  of  the  significant   advantages  that
PEG-hemoglobin  has over other products  currently  being  developed is its long
circulating life. The Company believes that hemoglobin, modified through its PEG
Process,  will  overcome  the  well-documented  problems of  toxicity  and short
circulating life associated with other forms of hemoglobin-based oxygen-carriers
that  have  been  developed.  The  Company's  Phase Ia trial  demonstrated  that
PEG-hemoglobin,  in its active form,  circulates in the blood for  approximately
eleven days. The extended  circulating  life  demonstrated in the Phase I safety
study  should  enable  PEG-hemoglobin  to be  administered  once a week  for the
radiation  treatment  protocol.  Enzon  has  chosen  to  develop  PEG-hemoglobin
utilizing bovine hemoglobin, based upon its superior oxygen-carrying properties,
relative stability, availability and low cost.

     Enzon presently produces  PEG-hemoglobin in a recently upgraded pilot plant
at its  facility  in South  Plainfield,  New  Jersey.  This plant is expected to
supply the  quantities  of  PEG-hemoglobin  needed for all ongoing  research and
development through Phase III clinical trials.

     The Company  estimates that  development of a  PEG-hemoglobin  product will
take several years and require  substantial  additional  funds.  There can be no
assurance  that a  PEG-hemoglobin  product  can be  successfully  developed  and
brought to market.  Due to the significant costs associated with the development
and  marketing of this product,  the Company is currently  looking for a medical
institution  or commercial  partner to bring this product into Phase II clinical
trials.  To date,  no such  agreements  have been  concluded and there can be no
assurance that any such agreements will be consummated.  Furthermore,  there can
be no assurance of market  acceptability  of a  hemoglobin-based  oxygen-carrier
produced from bovine hemoglobin.


                                       11
<PAGE>


PEG-camptothecin

     PEG-camptothecin  or  PROTHECAN(TM)  is the first  product to  utilize  the
Company's Third  Generation-Pro/Drug  Transport Technology.  The compound, a PEG
modified version of camptothecin,  a topo-1 inhibitor,  is being developed as an
oncolytic. Camptothecin, which was originally developed at the NIH and no longer
has patent protection, is believed be the most potent of the topo-1 inhibitors.

     For  many  years  camptothecin  has  been  known  to be a very  efficacious
oncolytic agent with drug delivery problems. Recently, camptothecin derivatives,
Hycamtin(TM)  and  Camptosar(R),  have been approved by the FDA. While these two
products  improved the solubility of camptothecin,  their efficacy is relatively
low. The Company believes that camptothecin  modified by its Pro  Drug/Transport
Technology has additional  delivery  advantages and increased  therapeutic value
over the camptothecin compounds on the market.

     The Company  believes  that the covalent  attachment  of PEG can be used to
inactivate the compound's toxic mechanism, while allowing it to circulate in the
bloodstream  for  long  periods  of  time,  thereby  allowing  the  compound  to
accumulate in the proximity of tumor sites.  Preliminary animal tests have shown
that Third Generation PEG modified compounds  accumulate in tumors. The covalent
bond used to attach PEG to  camptothecin  is  designed  to break down over time,
resulting in the PEG falling off the  compound,  allowing the compound to resume
its activity.

     The Company plans to file an IND on this product  during the second half of
calendar 1998.

Single-Chain Antigen-Binding (SCA) Proteins

     The Company is currently  evaluating  the  feasibility of licensing in, for
internal development, several SCA compounds currently under development.

     Currently,  there are ten SCA proteins that have either completed or are in
Phase  I or  II  clinical  trials  by  various  corporations  and  institutions,
including  a  product  developed  by  one of the  Company's  licensees,  Alexion
Pharmaceuticals,  Inc. which is in a Phase IIb clinical trial. Some of the areas
being explored with SCA's are cancer  therapy,  cardiovascular  indications  and
AIDS.

Strategic Alliances and License Agreements

     In addition to internal  product  development,  the Company  utilizes joint
development   and  licensing   arrangements   with  other   pharmaceutical   and
biopharmaceutical  companies,  to expand the pipeline of products  utilizing its
proprietary  PEG  and  SCA  protein   technologies.   Enzon  believes  that  its
technologies  can be used to improve products which are already on the market or
that are under  development,  thus  producing  therapeutic  products  which will
provide a safer,  more effective and more  convenient  therapy.  Currently,  the
Company's  partners  have two products in late stages of the approval  progress,
PEG-Intron A and a recombinant Human Serum Albumin ("rHSA"),  as well as several
SCA compounds in Phase I and Phase II clinical trials.

Schering Agreement

     The  Company  and  Schering  Corporation  ("Schering"),   a  subsidiary  of
Schering-Plough,  entered  into an  agreement  in November  1990 (the  "Schering
Agreement")  to apply the  Company's  PEG Process to develop a modified  form of
Schering-Plough's  INTRON  A  (interferon  alfa  2b),  a  genetically-engineered
anticancer and antiviral drug with longer  activity.  A PEG-modified  version of
INTRON A is  currently  in Phase III  clinical  trials for  hepatitis  C and has
recently  entered  Phase III  clinical  trials  for  malignant  melanona.  It is
expected that PEG-Intron A will be  administered  once a week as compared to the
current regimen for unmodified INTRON A of three times a week. Other indications
currently being pursued by Schering include


                                       12
<PAGE>


chronic myelogenous  leukemia,  solid tumors, as well as combination trials with
REBETOL for the  treatment of Hepatitis C.  PEG-Intron A utilizes the  Company's
Second Generation PEG Technology.

     INTRON A is  currently  approved  in the  United  States for use in chronic
hepatitis B, chronic hepatitis C, AIDS-related Kaposi's sarcoma, venereal warts,
hairy cell leukemia and malignant melanoma.  It is marketed worldwide for use in
16 major disease  indications.  Schering-Plough  reported 1997 INTRON A sales of
$598 million worldwide.

     Under the license  agreement,  which was amended in 1995,  the Company will
receive  royalties  on  worldwide  sales of  PEG-Intron  A, if any.  Schering is
responsible  for  conducting  and  funding  the  clinical   studies,   obtaining
regulatory  approval and marketing the product  worldwide on an exclusive basis.
Enzon  also has the  option  to  become  Schering's  exclusive  manufacturer  of
PEG-Intron A for the United States market upon FDA approval of such product.

     Enzon is also entitled to receive future  sequential  payments,  subject to
the  achievement  of certain  milestones in the product's  development  program.
During  August  1997,  Enzon  received  $2,500,000  in milestone  payments  from
Schering as a result of the product moving into Phase III clinical trials. Enzon
is entitled to an additional  $3,000,000 in payments from  Schering,  subject to
the achievement of certain additional milestones in the product's development.

     The Schering Agreement terminates,  on a country-by-country basis, upon the
expiration  of the last to expire of any future  patents  covering  the  product
which may be issued to Enzon,  or 15 years  after the  product is  approved  for
commercial  sale,  whichever  shall be the later to  occur.  This  agreement  is
subject to Schering's  right of early  termination  if the product does not meet
specifications,  if Enzon  fails to obtain or  maintain  the  requisite  product
liability insurance, or if Schering makes certain payments to Enzon. If Schering
terminates the agreement because the product does not meet specifications, Enzon
may be required to refund certain of the milestone payments.

Green Cross Agreement

     The Company has a license  agreement with Green Cross  Corporation  ("Green
Cross") (which was recently acquired by Yoshitomi Pharmaceutical,  Inc.) for the
development  of a recombinant  Human Serum Albumin  ("rHSA"),  as a blood volume
expander.  Green Cross has reported that it filed for marketing approval of this
product in Japan in November 1997. The agreement,  which the Company acquired as
part of the  acquisition  of  Genex  Corporation  in 1991,  entitles  Enzon to a
royalty  on sales  of an rHSA  product  sold by Green  Cross in much of Asia and
North and South America.  Currently, Green Cross is only developing this product
for the Japanese  market.  The royalty is payable  under the  agreement  for the
first  fifteen  years  of  commercial   sales.  The  parties  are  currently  in
arbitration  to resolve a dispute  regarding  the royalty rate called for in the
agreement.  Green Cross has filed papers in the arbitration  taking the position
that no royalty will be due to Enzon. Enzon does not believe that the provisions
in the license  agreement  support  such a position  and  intends to  vigorously
pursue its claim to a royalty in the arbitration. There can be no assurance that
Enzon will prevail in the arbitration.


                                       13
<PAGE>


SCA Protein Technology Licenses

     The Company's SCA protein licenses are primarily on a non-exclusive  basis,
and in most cases,  provide for the partner to pay for all development costs and
to market the products.  Enzon receives a royalty on the sale of any SCA protein
product developed,  as well as, in most cases, payments based on the achievement
of certain  milestones in the  development of the product.  The Company has more
than 15 non-exclusive SCA protein  licenses.  The following is a partial list of
the Company's SCA protein licenses.

<TABLE>
<CAPTION>
Corporate Partner                      Agreement Date                 Product                 Disease or Indication   Program Status
- -----------------                      --------------                --------                 ---------------------   --------------
<S>                                    <C>                           <C>                        <C>                       <C>
Alexion Pharmaceuticals, Inc.          May 1996                      Complement                 Cardiopulmonary           Phase IIb
                                                                     Protein C5                 bypass and myocar-
                                                                                                 dial infarction

Baxter Healthcare Corporation          November 1992                 SCA proteins               Cancer                    Research

Bristol-Myers Squibb Company           September 1993/July 1994      SCA proteins               All Therapeutics          Research
    Seattle Genetics                   September 1998*               BR96                       Cancer                     Phase I

Cambridge Antibody Technology Ltd.     September 1996                Phage Display Library      All Therapeutics          Research

Cell Genesys, Inc.                     November 1993                 SCA/Receptor Technology    Colon Cancer              Phase I/II

Eli Lilly and Co.                      December 1992                 SCA proteins               Undetermined              Research

Gencell Division of RPR                December 1995                 SCA proteins               Gene Therapy              Research
</TABLE>


*Bristol-Myers Squibb sublicensed BR96 SCI to Seattle Genetics. This is the only
compound that is sublicensed under the Bristol-Myers Agreement.


Marketing

     Other than  ADAGEN,  which the Company  markets on a  worldwide  basis to a
small patient  population,  the Company does not engage in the direct commercial
marketing  of any of its  products and  therefore  does not have an  established
sales force.  For certain of its  products,  the Company has provided  exclusive
marketing  rights to its  corporate  partners in return for  royalties on sales.
With respect to ONCASPAR, the Company has granted exclusive marketing rights to,
(i) RPR for North  America and the Pacific Rim, (ii) MEDAC for Europe and Russia
and (iii) Tzamal Pharma Ltd. for Israel, pursuant to the agreements described in
"Products on the Market - ONCASPAR".

     The Company  expects to evaluate  whether to create a sales force to market
certain  products in the United  States or to continue to enter into license and
marketing  agreements  with others for the United  States and  foreign  markets.
These  agreements  generally  provide that all or a  significant  portion of the
marketing of these  products  will be conducted  by the  Company's  licensees or
marketing  partners.  In  addition,  under  certain  of  these  agreements,  the
Company's licensee or marketing  partners may have all or a significant  portion
of the development and regulatory approval responsibilities.

Raw Materials and Manufacturing

     In the manufacture of its products,  the Company couples activated forms of
PEG to the unmodified proteins.  In the case of PEG, the Company does not have a
long-term  supply  agreement,  but maintains  what it believes to be an adequate
inventory which should provide the Company  sufficient time to find an alternate
supplier of PEG, in the event it becomes necessary,  without material disruption
of its business.

     The  Company  manufactures  its  two  FDA  approved  products,  ADAGEN  and
ONCASPAR,  in its South Plainfield,  New Jersey facility. On a continuing basis,
the Company's facility is inspected by two branches of the


                                       14
<PAGE>


FDA, the Center for Drugs  Evaluation  and Research and the Center for Biologics
Evaluation   and  Research,   for   compliance   with  the  FDA's  current  Good
Manufacturing  Practices.  The facility has also been  inspected by the Canadian
Health  Protection Branch and the German Federal Institute for Drugs and Medical
Devices,  the  equivalent  of the  FDA in  those  countries.  The  manufacturing
facility was granted an establishment license by the FDA in February 1994.

     Except for PEG-hemoglobin,  the Company purchases the unmodified  compounds
utilized in its approved  products and products under  development  from outside
suppliers.  The Company has a supply  contract with an outside  supplier for the
unmodified   ADA  used  in  the   manufacture   of  ADAGEN  and  the  unmodified
L-asparaginases  used in the manufacture of ONCASPAR.  The Company purchases the
unmodified  L-asparaginase  used in the  production of ONCASPAR for the European
market from a different supplier than that used for the U.S. market.

     Recently the Company's quality assurance  department has observed increased
levels of  particulates  in certain  batches of ONCASPAR which it  manufactures.
These batches were not shipped and the Company's  recent  rejection rate for the
manufacture  of  this  product  is   significantly   higher  than  it  has  been
historically. The Company is engaged in an extensive review of its manufacturing
procedures  for this  product  and  believes  that the problem may be related to
certain  materials which are used in the filling process,  although this has not
yet been determined.  The Company has been in discussions with the FDA regarding
this problem and expects to have further discussions shortly with the FDA. It is
possible  that the FDA may not allow the  Company  to ship  ONCASPAR  until this
problem is resolved.  However,  it is also  possible that the FDA may permit the
Company to ship units of  ONCASPAR  which the Company  determines  are free from
particulates,  including  units  currently on hand. This problem may result in a
temporary or extended  disruption in the  distribution of ONCASPAR.  An extended
disruption could have a material adverse impact on future ONCASPAR sales.

     The Company  currently  obtains its raw  hemoglobin  from a small colony of
animals which are isolated and receive regular veterinary care and testing. This
should insure that the animals  remain  disease free. In addition to keeping the
animals  disease free,  the  Company's  manufacturing  process  provides or will
provide virus removal,  inactivation and filtration steps. Enzon believes it can
supply the potential market demand for PEG-hemoglobin through a relatively small
number of animals.

     Schering is required  under the  Schering  Agreement to provide the Company
with  unmodified  INTRON A if the Company  exercises  its option to  manufacture
PEG-Intron A for the United States market.

     Delays in obtaining or an inability to obtain any unmodified compound which
the Company does not produce, including unmodified ADA or L-asparaginase,  could
have a  material  adverse  effect on the  Company.  In the event the  Company is
required to locate an alternate supplier for an unmodified  compound utilized in
a product which is being sold commercially or which is in clinical  development,
the Company will likely be required to do additional testing,  which could cause
delay and  additional  expense,  to  demonstrate  that the alternate  supplier's
material is biologically  and chemically  equivalent to the unmodified  compound
previously  used.  Such  evaluations  could include one or all of the following:
chemical,  preclinical and clinical  studies.  Requirements for such evaluations
would be determined by the stage of the product's  development and the reviewing
division  of the FDA.  If such  alternate  material  is not  demonstrated  to be
chemically  and  biologically  equivalent  to  the  previously  used  unmodified
compound,  the  Company  will  likely be  required  to repeat some or all of the
preclinical  and clinical  trials with such  compound.  The  marketing of an FDA
approved  drug could be disrupted  while such tests are  conducted.  Even if the
alternate material is shown to be chemically and biologically  equivalent to the
previously used compound,  the FDA may require the Company to conduct additional
clinical trials with such alternate material.

Government Regulation

     The manufacturing  and marketing of  pharmaceutical  products in the United
States  requires  the  approval  of the FDA under  the  Federal  Food,  Drug and
Cosmetic Act. Similar approvals by comparable agencies are required in


                                       15
<PAGE>


most foreign countries.  The FDA has established mandatory procedures and safety
standards  which apply to the clinical  testing,  manufacture  and  marketing of
pharmaceutical  products.  Obtaining FDA approval for a new therapeutic may take
several years and involve substantial expenditures. Pharmaceutical manufacturing
facilities are also regulated by state, local and other authorities.

     As an initial  step in the FDA  regulatory  approval  process,  preclinical
studies  are  conducted  in animal  models to  assess a drug's  efficacy  and to
identify  potential safety problems.  The results of these studies are submitted
to the FDA as a part of the IND,  which is filed  to  obtain  approval  to begin
human clinical  testing.  The human clinical  testing  program may involve up to
three  phases.  Data from human  trials are  submitted  to the FDA in a New Drug
Application  ("NDA")  or  Biologic  or  Product  License  Application   ("PLA").
Preparing an NDA or PLA involves considerable data collection,  verification and
analysis.

     ADAGEN was  approved by the FDA in March 1990.  ONCASPAR  was  approved for
marketing  in the U.S.  and Germany in 1994 and in Canada in  December  1997 for
patients with ALL who are hypersensitive to native forms of L-asparaginase,  and
in Russia in April 1993 for therapeutic use in a broad range of cancers.  Except
for these approvals, none of the Company's other products have been approved for
sale and use in  humans  in the  United  States or  elsewhere.  Difficulties  or
unanticipated  costs may be  encountered  by the  Company  or its  licensees  or
marketing partners in their respective efforts to secure necessary  governmental
approvals,  which  could  delay or  preclude  the  Company or its  licensees  or
marketing partners from marketing their products.

     With  respect  to  patented  products,  delays  imposed  by the  government
approval process may materially  reduce the period during which the Company will
have the exclusive right to exploit them. See "Patents".

Competition

     Many established  biotechnology and  pharmaceutical  companies with greater
resources than the Company are engaged in activities that are  competitive  with
those of Enzon and may develop products or technologies which compete with those
of the Company.  Although Enzon believes that the experience of its personnel in
biotechnology,  the patents which have been licensed by or issued to the Company
and  the  proprietary  know-how  developed  by the  Company  provide  it  with a
competitive  advantage in its field,  there can be no assurance that the Company
will be able to maintain any competitive advantage,  should it exist, in view of
the greater size and resources of many of the Company's competitors.

     Enzon  is  aware  that  other  companies  are  conducting  research  on and
developing  chemically modified  therapeutic proteins and that certain companies
are modifying  pharmaceutical  products,  including proteins,  by attaching PEG.
Other than the Company's products ONCASPAR and ADAGEN, the Company is unaware of
any PEG-modified therapeutic proteins which are currently available commercially
for therapeutic use, although it is aware of PEG-modified  therapeutic  proteins
currently in clinical trials. Nevertheless,  other drugs or treatment modalities
which are currently  available or that may be developed in the future, and which
treat the same  diseases as those which the  Company's  products are designed to
treat, may be competitive with the Company's products.

     Prior to the  development  of  ADAGEN,  the  Company's  first FDA  approved
product,  the only treatment  available to patients afflicted with ADA deficient
SCID was a bone marrow  transplant.  Completing a successful  transplant depends
upon finding a matched  donor,  the  probability of which is low. More recently,
researchers at the National  Institute of Health ("NIH") have been attempting to
treat SCID patients with gene therapy,  which if successfully  developed,  would
compete with, and could eventually  replace ADAGEN as a treatment.  The patients
in these  trials are also  receiving  ADAGEN  treatment  in addition to the gene
therapy. The theory behind gene therapy is that cultured  T-lymphocytes that are
genetically   engineered  and  injected  back  into  the  patient  will  express
permanently and at normal levels,  adenosine deaminase,  the deficient enzyme in
people  afflicted  with ADA deficient  SCID.  To date,  patients in gene therapy
clinical trials have not been able to stop ADAGEN  treatment and therefore,  the
trial has been inconclusive.


                                       16
<PAGE>


     Current  standard  treatment of patients  with ALL  includes  administering
unmodified  L-asparaginase  along  with the drugs  vincristine,  prednisone  and
daunomycin.  Studies have shown that  long-term  treatment  with  L-asparaginase
increases  the  disease  free  survival  in high risk  patients.  ONCASPAR,  the
Company's  PEG-modified  L-asparaginase  product, is used to treat patients with
ALL who are hypersensitive to unmodified forms of L-asparaginase.  The long-term
survival and cure of ALL patients generally depends upon achieving a sustainable
first  remission.  Currently,  there is one  unmodified  form of  L-asparaginase
available in the United  States  (Elspar) and several  available in Europe.  The
Company believes that ONCASPAR has two advantages over these unmodified forms of
L-asparaginase:   increased   circulating   blood  life  and  generally  reduced
immunogenicity.

     The current  market for INTRON A,  Schering  Plough's  interferon  alpha 2b
product,  is  highly  competitive,   with  Schering,   Hoffmann-La  Roche,  Inc.
("Hoffmann-La Roche") and Amgen, Inc. as well as several other companies selling
similar products.  The Company believes that its PEG modified INTRON A will have
several  potential  advantages  over the  interferon  products  currently on the
market,  principally  once a week dosing  versus the current  three times a week
dosing,  with an improved  side effect  profile.  It has also been reported that
Hoffmann-La  Roche  also  has  a  potentially  longer  lasting  version  of  its
interferon product, Roferon(R), in Phase III clinical trials.

     Several  companies  are  actively  pursuing  the  development  of agents to
increase the oxygen  level in solid  tumors and thereby  enhance the efficacy of
radiation and/or  chemotherapy that could compete with  PEG-hemoglobin.  Some of
these  agents  are also being  tested in  clinical  trials.  In  addition,  many
conventional  cytotoxic agents are currently used in combination with each other
and/or with radiation to give additive or synergistic anti-cancer effects.

     Compounds  that decrease the affinity of hemoglobin  for oxygen and thereby
increase  the level of free  oxygen in the blood  have been known for some time.
These "synthetic  allosteric  modifier" compounds are currently being studied in
clinical  trials for their  ability to  increase  the level of oxygen in tumors,
which could  enhance the  efficacy of  radiation  therapy  and/or  chemotherapy.
Compounds that inhibit the ability of cancer cells to repair radiation damage to
their DNA are also known, and one such compound is reportedly in clinical trials
as an adjunct to radiation therapy.

     Companies are also actively  pursuing the  development of  hemoglobin-based
oxygen-carriers  for use as a blood substitute and certain of these products are
currently being tested in clinical trials.  Currently, the Company believes that
none of the other companies developing hemoglobin-based oxygen-carriers as blood
substitutes are pursuing a radiosensitization  indication.  The Company believes
that PEG-hemoglobin,  due to its long circulating life, will deliver more oxygen
to hypoxic tumors than the products  currently under  development and therefore,
in combination  with  radiation,  should result in a greater  reduction in tumor
size.

     There are several technologies which compete with the Company's SCA protein
technology,   including  chimeric  antibodies,   humanized   antibodies,   human
monoclonal antibodies,  recombinant antibody Fab fragments, low molecular weight
peptides and mimetics.  These competing technologies can be categorized into two
areas:  (i) those  modifying the monoclonal  antibody to minimize  immunological
reaction to a foreign  protein,  which is the strategy  employed with chimerics,
humanized  antibodies  and human  monoclonal  antibodies and (ii) those creating
smaller  portions  of the  monoclonal  antibody  which are more  specific to the
target and have fewer side  effects,  as is the case with Fab  fragments and low
molecular  weight  peptides.  Enzon  believes  that the smaller  size of its SCA
proteins  should  permit  better  penetration  into the  tumor,  result in rapid
clearance  from the blood and cause a  significant  decrease in the  immunogenic
problems  associated  with  conventional  monoclonal  antibodies.  A  number  of
organizations  have active programs in SCA proteins.  The Company  believes that
its  patent  position  on SCA  proteins  will  require  companies  that have not
licensed  its SCA  protein  patents  to obtain  licenses  from Enzon in order to
commercialize their products, but there can be no assurance that this will prove
to be the case.


                                       17
<PAGE>


Patents

     The  Company  has  licensed,  and been  issued,  a number of patents in the
United States and other countries and has other patent  applications  pending to
protect its  proprietary  technology.  Although  the Company  believes  that its
patents provide adequate protection for the conduct of its business there can be
no assurance that such patents will be of  substantial  protection or commercial
benefit  to the  Company,  will  afford the  Company  adequate  protection  from
competing  products,  will  not be  challenged  or  declared  invalid,  or  that
additional United States patents or foreign patent equivalents will be issued to
the Company.  The degree of patent protection to be afforded to biotechnological
inventions  is  uncertain  and  the  Company's  products  are  subject  to  this
uncertainty.  The  Company  is  aware  of  certain  issued  patents  and  patent
applications,  and  there  may be other  patents  and  applications,  containing
subject matter which the Company or its licensees or  collaborators  may require
in order to research,  develop or  commercialize  at least some of the Company's
products.  There can be no assurance  that  licenses  under such patents will be
available  on  acceptable  terms.  In certain  cases,  the Company has  obtained
opinions of patent  counsel  that  certain of such  patents,  including  patents
relevant to PEG  hemoglobin  held by Biopure  Inc.  and patents  relevant to PEG
alpha interferon held by Hoffmann-La Roche, are not infringed by the products of
the Company or its  collaborators or would not be held to be valid if litigated.
Such  opinions  have been relied upon by the  Company and its  collaborators  in
continuing to pursue  development of the subject product.  Such opinions are not
binding on any court and there can be no assurance that such opinions will prove
to be correct and that a court  would find any of the claims of such  patents to
be invalid or that the product developed by the Company or its collaborator does
not infringe such  patents.  The Company  expects that there may be  significant
litigation in the industry  regarding patents and other proprietary  rights and,
if  Enzon  were to  become  involved  in such  litigation,  it could  consume  a
substantial amount of the Company's resources.  In addition,  the Company relies
heavily on its proprietary  technologies  for which pending patent  applications
have been filed and on unpatented know-how developed by the Company.  Insofar as
the Company  relies on trade  secrets and  unpatented  know-how to maintain  its
competitive  technological  position,  there can be no assurance that others may
not independently develop the same or similar technologies. Although the Company
has  taken  steps  to  protect  its  trade  secrets  and  unpatented   know-how,
third-parties nonetheless may gain access to such information.

     The  original  PEG  Process  patent,   which  was  licensed  from  Research
Technologies  Corp.,  expired in December 1996. The Company has made significant
improvements  to the  original  PEG Process  and has  applied  for and  received
numerous  patents  for such  improvements.  The Company  believes,  based on new
patents received and applications  pending,  that the expiration of the original
PEG Process patent will not have a material impact on its business.

     In the field of SCA  proteins,  the Company has several  United  States and
foreign patents and pending patent  applications,  including a patent granted in
August  1990  covering  the  genes  needed  to  encode  SCA  proteins.  Creative
BioMolecules,  Inc. ("Creative") provoked an interference with the patent and on
June 28, 1991,  the United States Patent and Trademark  Office  entered  summary
judgment  terminating  the  interference  proceeding and upholding the Company's
patent.  Creative  subsequently  lost its appeal of this  decision in the United
States Court of Appeals and did not file a petition for review of this  decision
by the United States Supreme Court within the required time period.

     In November 1993, Enzon and Creative signed collaborative agreements in the
field of Enzon's SCA protein  technology  and Creative's  Biosynthetic  Antibody
Binding Site (BABS(TM)) protein technology.  Under the agreements,  each company
is free, under a non-exclusive,  worldwide license, to develop and sell products
utilizing  the  technology  claimed  by  both  companies'  antibody  engineering
patents,  without  paying  royalties  to the other.  Each is also free to market
products in  collaboration  with third  parties,  but the third  parties will be
required  to pay  royalties  on products  covered by the  patents  which will be
shared by the companies,  except in certain  instances.  Enzon has the exclusive
right to market licenses under both companies'  patents other than to Creative's
collaborators. In addition, the agreements provide for the release and discharge
by each company of the other from any and all claims based on past  infringement
of the technology which is the subject of the agreements. The


                                       18
<PAGE>


agreement also provides for any future disputes between the companies  regarding
new  patents in the area of  engineered  monoclonal  antibodies  to be  resolved
pursuant to agreed upon procedures.

Employees

     As of June 30, 1998, Enzon employed 83 persons,  of whom 33 were engaged in
research and development  activities,  32 were engaged in manufacturing,  and 18
were engaged in administration and management.  As of June 30, 1998, the Company
had 14 employees who hold Ph.D.  degrees.  The Company believes that it has been
successful in attracting skilled and experienced scientific personnel;  however,
competition for such personnel is intensifying.  None of the Company's employees
are covered by a collective bargaining agreement. All of the Company's employees
are covered by confidentiality  agreements.  Enzon considers  relations with its
employees to be good.

Item 2. Properties

     The Company owns no real property.  The following are all of the facilities
that Enzon currently leases:

<TABLE>
<CAPTION>
                                                                  Approx.          Approx.
                                       Principal                  Square           Annual                   Lease
      Location                         Operations                 Footage           Rent                  Expiration
      --------                         ----------                 -------           ----                  ----------
<S>                                 <C>                           <C>             <C>                    <C> 
  20 Kingsbridge Road               Research & Development        56,000          $496,000(1)            June 15, 2007
   Piscataway, NJ                   and Administrative

  40 Cragwood Road                  Warehousing                   88,000           446,000(2)            December 31, 1998
   S. Plainfield, NJ

  300 Corporate Ct.                 Manufacturing                 24,000           183,000               March 31, 2007
   S. Plainfield, NJ
</TABLE>

(1)  Under the terms of the lease, annual rent increases over the remaining term
     of the lease from $496,000 to $581,000.

(2)  Amount  represents  the rent due for the period  from July 1, 1998  through
     termination of the lease on December 31, 1998, net of sub-rental  income of
     $110,000. The sublease is for approximately 27,412 square feet. The Company
     has  consolidated  the  operations  of this facility into its remaining two
     facilities and does not intend to renew this lease.

     The Company  believes that its facilities are well maintained and generally
adequate for its present and future anticipated needs.

Item 3. Legal Proceedings

     The  Company is being sued,  in the United  States  District  Court for the
District of New Jersey,  by a former financial  advisor,  LBC Capital  Resources
Inc.  ("LBC"),  which is asserting  that under the May 2, 1995 letter  agreement
("Letter  Agreement") between Enzon and LBC, LBC was entitled to a commission in
connection  with the  Company's  January  and  March  1996  private  placements,
comprised of $500,000 and warrants to purchase  1,000,000 shares of Enzon Common
Stock at an exercise price of $2.50 per share.  LBC has also asserted that it is
entitled to an  additional  fee of  $175,000  and  warrants to purchase  250,000
shares of Enzon Common Stock when and if any of the warrants  obtained  pursuant
to  the  private  placements  are  exercised.  LBC  has  claimed  $3,000,000  in
compensatory  damages,  plus  punitive  damages,  counsel fees and costs for the
alleged  breach of the  Letter  Agreement.  The  Company  believes  that no such
commission was due under the Letter Agreement and denies any liability under the
Letter Agreement. The Company intends to defend this lawsuit vigorously.


                                       19
<PAGE>


     There is no other  pending  material  litigation  to which the Company is a
party or to which any of its property is subject.


Item 4. Submission of Matters to a Vote of Security Holders

            None.


                                       20
<PAGE>


                                     PART II


Item 5. Market for the Registrant's Common Equity and
        Related Stockholder Matters                   

     The Company's Common Stock is traded in the over-the-counter  market and is
quoted on the NASDAQ National Market under the trading symbol "ENZN".

     The following  table sets forth the high and low sale prices for the Common
Stock for the years  ended June 30,  1998 and 1997,  as  reported  by the NASDAQ
National  Market.  The quotations  shown represent  inter-dealer  prices without
adjustment for retail markups, markdowns or commissions, and may not necessarily
reflect actual transactions.

                                                            High        Low
                                                            ----        ---
            Year Ended June 30, 1998
              First Quarter                                 5 3/16      2
              Second Quarter                                7 1/4       4 3/4
              Third Quarter                                 7 3/16      5 1/8
              Fourth Quarter                                6 7/8       4 9/16

            Year Ended June 30, 1997
              First Quarter                                 3 1/2       2 1/16
              Second Quarter                                3 1/4       2 1/8
              Third Quarter                                 3 1/2       2 3/8
              Fourth Quarter                                3 1/16      2 1/8

     As of September  11, 1998 there were 2,573  holders of record of the Common
Stock.

     The Company has paid no dividends  on its Common Stock since its  inception
and  does not  plan to pay  dividends  on its  Common  Stock in the  foreseeable
future.  Except as may be utilized  to pay  dividends  payable on the  Company's
outstanding Series A Cumulative Convertible Preferred Stock ("Series A Preferred
Shares" or "Series A  Preferred  Stock"),  any  earnings  which the  Company may
realize will be retained to finance the growth of the Company.  In addition,  no
dividends  may be paid or set apart for payment on the Common  Stock  unless the
Company shall have paid in full, or made  appropriate  provision for the payment
in full of, all dividends which have then  accumulated on the Series A Preferred
Shares.


                                       21
<PAGE>


Item 6. Selected Financial Data

     Set forth below is the selected financial data for the Company for the five
fiscal years ended June 30, 1998.


<TABLE>
<CAPTION>
Consolidated Statement of Operations Data:
                                                                        Year Ended June 30,
                                           --------------------------------------------------------------------------------------
                                           1998                 1997                1996                 1995                1994
                                           ----                 ----                ----                 ----                ----
<S>                                     <C>                 <C>                 <C>                 <C>                <C>        
Revenues                                $14,644,032         $12,727,052         $12,681,281         $15,826,437         $14,797,499
Net Loss                                $(3,617,133)        $(4,557,025)        $(5,175,279)        $(6,291,491)       $(16,495,226)
Net Loss per Share                           $(0.12)             $(0.16)              $(.20)              $(.26)              $(.71)
Dividends on
  Common Stock                                 None                None                None                None                None

<CAPTION>
Consolidated Balance Sheet Data:
                                                                               June 30,
                                           --------------------------------------------------------------------------------------
                                           1998                 1997                1996                 1995                1994
                                           ----                 ----                ----                 ----                ----
<S>                                     <C>                 <C>                 <C>                 <C>                 <C>        
Total Assets                            $13,741,378         $16,005,278         $21,963,856         $19,184,042         $20,543,252
Long-Term
 Obligations                            $      --           $      --                $1,728              $4,076            $115,733
</TABLE>


Item 7. Management's Discussion and Analysis of Financial
        Condition and Results of Operations            

Results of Operations

Fiscal Years Ended June 30, 1998, 1997 and 1996

     Revenues.   Revenues  for  the  year  ended  June  30,  1998  increased  to
$14,644,000  as compared to  $12,727,000  for fiscal  1997.  The  components  of
revenues  are  sales,  which  consist  of sales of the  Company's  products  and
royalties on the sale of such products by others, and contract  revenues.  Sales
increased by 6% to  $12,313,000  for the year ended June 30, 1998 as compared to
$11,596,000  for the prior year.  The  increase was due to an increase in ADAGEN
sales of  approximately  13%,  resulting from an increase in patients  receiving
ADAGEN treatment. Net sales of ADAGEN, which is marketed by Enzon, for the years
ended June 30,  1998 and 1997 were  $10,107,000  and  $8,935,000,  respectively.
ONCASPAR,  the Company's  other  approved  product,  is marketed in the U.S. and
Canada by RPR and in  Europe  by  MEDAC.  ONCASPAR  revenues  are  comprised  of
manufacturing  revenues,  as well as  royalties  on  sales of  ONCASPAR  by RPR.
ONCASPAR revenues decreased due to a decline in manufacturing  revenue resulting
from  difficulties  encountered  in  the  Company's  manufacturing  process,  as
described below.  The decrease in manufacturing  revenue was partially offset by
increased royalties due to an increase in sales of ONCASPAR by RPR.

     Recently the Company's quality assurance  department has observed increased
levels of  particulates  in certain  batches on ONCASPAR which it  manufactures.
These batches were not shipped and the Company's  recent  rejection rate for the
manufacture  of  this  product  is   significantly   higher  than  it  has  been
historically. The Company is engaged in an extensive review of its manufacturing
procedures  for this  product  and  believes  that the problem may be related to
certain  materials which are used in the filling process,  although this has not
yet been determined.  The Company has been in discussions with the FDA regarding
this problem and expects to have further discussions shortly with the FDA. It is
possible  that the FDA may not allow the  Company  to ship  ONCASPAR  until this
problem is resolved.  However,  it is also  possible that the FDA may permit the
Company to ship units of  ONCASPAR  which the Company  determines  are free from
particulates,  including  units  currently on hand. This problem may result in a
temporary or extended  disruption in the  distribution of ONCASPAR.  An extended
disruption could have a material adverse impact on future ONCASPAR sales.


                                       22
<PAGE>


     The Company  expects  sales of ADAGEN to increase  at  comparable  rates as
those achieved during the last two years as additional patients are treated. The
Company also  anticipates  moderate growth of ONCASPAR sales to its partners and
increased  royalties  on RPR  sales  of  ONCASPAR  for  the  currently  approved
indication.  RPR and MEDAC are conducting  clinical  trials to expand the use of
ONCASPAR  beyond its  current  approved  indication  which  could also result in
additional  revenues  from this  product,  subject  to the  manufacturing  issue
discussed  in the  preceeding  paragraph.  There  can be no  assurance  that any
particular  sales  levels of ONCASPAR or ADAGEN will be achieved or  maintained.

     Contract  revenue for the year ended June 30, 1998 increased to $2,331,000,
as compared to $1,131,000 for fiscal 1997. The increase was  principally  due to
an  increase  in  milestone  payments  received  under the  Company's  licensing
agreement for PEG-Intron A with Schering-Plough Corporation ("Schering-Plough").
During  the year ended June 30,  1998,  the  Company  recognized  $2,200,000  in
milestone payments received as a result of Schering-Plough  advancing PEG-Intron
A  into  a  Phase  III  clinical  trial.  PEG-Intron  A is a  modified  form  of
Schering-Plough's  INTRON(R) A (interferon alfa-2b,  recombinant),  developed by
Enzon to have  longer-acting  properties.  INTRON A is a genetically  engineered
anticancer   and  antiviral   agent,   developed   and  marketed   worldwide  by
Schering-Plough. Sales of INTRON A by Schering-Plough were $598 million in 1997.
The  worldwide  market for alpha  interferon  is estimated to be in excess of $1
billion. Under the Company's licensing agreement, Enzon is entitled to royalties
on  product  sales  and has the  option to  become  Schering-Plough's  exclusive
manufacturer  of PEG-Intron A for the U.S.  market.  During the prior year,  the
Company  received  a  $1,000,000  milestone  payment  under  the same  licensing
agreement with  Schering-Plough.  During the years ended June 30, 1998 and 1997,
the Company had export sales of $2,641,000  and  $2,377,000,  of these  amounts,
sales in Europe were $2,117,000 and $1,937,000, respectively.

     Revenues  for the year ended June 30,  1997  increased  to  $12,727,000  as
compared to $12,681,000  for fiscal 1996.  Sales increased by 10% to $11,596,000
for the year ended June 30, 1997 as compared to $10,502,000  for the prior year.
The  increase  was due to an increase in  ONCASPAR  revenues  and an increase in
ADAGEN  sales of  approximately  3%,  resulting  from an  increase  in  patients
receiving ADAGEN treatment. Net sales of ADAGEN, which is marketed by Enzon, for
the  years  ended  June 30,  1997  and  1996  were  $8,935,000  and  $8,696,000,
respectively. ONCASPAR, the Company's other approved product, is marketed in the
U.S.  by RPR and in Europe  by  MEDAC.  ONCASPAR  revenues  increased  due to an
increase in sales of ONCASPAR by RPR as well as an increase in the royalty  rate
under the RPR  agreement  during the  second  half of fiscal  1996,  to 23.5% as
compared  to the  former  rate  of  10.0%.  The  increase  was  also  due to the
commencement  of  shipments  during  fiscal  1997 of  ONCASPAR  to MEDAC for the
European market.  Contract revenue for the year ended June 30, 1997 decreased by
48% to  $1,131,000,  as compared to $2,179,000 for fiscal 1996. The decrease was
principally due to the one-time gain, in fiscal 1996, related to the exercise of
warrants  received  from  Neoprobe   Corporation  and  sale  of  the  underlying
securities. The warrants were consideration related to a licensing agreement for
the Company's SCA protein  technology.  During the years ended June 30, 1997 and
1996,  the Company  had export  sales of  $2,377,000  and  $2,270,000,  of these
amounts, sales in Europe were $1,937,000 and $1,858,000, respectively.

     Cost of Sales.  Cost of sales,  as a percentage of sales,  decreased to 30%
for the year  ended  June 30,  1998 as  compared  to 33% for  fiscal  1997.  The
decrease was  primarily due to the prior year's  expense of excess  ONCASPAR raw
material and purchase  commitments related to the Company's supply agreement for
this material.  During the fiscal year ended January 1998,  the Company  amended
its supply  agreement for this material which extended the period  available for
the Company to accept  delivery of its  remaining  purchase  commitment  through
1999, in exchange for a $1,300,000  advance  payment of the  remaining  purchase
commitment. (See Note 3 to the Consolidated Financial Statements).

     Cost of sales,  as a  percentage  of sales,  decreased  to 33% for the year
ended June 30, 1997 as compared to 34% for fiscal 1996.  The decrease was due to
a reduction in the  write-off of excess raw material  used in the  production of
ONCASPAR.  While it is possible that the Company may incur similar losses on its
remaining purchase commitments under the amended supply agreement (see Note 3 to
the  Consolidated  Financial  Statements),  the Company does not  consider  such
losses  probable,  nor can the amount of any loss which may be  incurred  in the
future  presently be  estimated  due to a number of factors,  including  but not
limited to potential increased demand for


                                       23
<PAGE>


ONCASPAR from RPR or expansion into additional markets outside the U.S.

     Research and  Development.  Research and development  expenses for the year
ended June 30, 1998 remained  relatively  unchanged at $8,654,000 as compared to
$8,520,000 for fiscal 1997. The Company's research and development  efforts were
focused on the continued  development of its Third Generation Pro Drug/Transport
Technology,  which included preclinical activities in preparation for the filing
of an Investigational New Drug Application (IND) for  PEG-camptothecin,  as well
as a clinical trial for PEG-hemoglobin.

     Research and development  expenses decreased by 16% for the year ended June
30, 1997 as compared to the prior year.  The decrease was  primarily  due to (i)
reductions in personnel made during fiscal 1996, principally in the clinical and
research  administration  areas,  and related  costs,  such as payroll taxes and
benefits and (ii) other cost containment  measures  resulting from the narrowing
of the Company's  research  efforts to focus on  technologies  and products with
large revenue potential.

     Selling,  General  and  Administrative   Expenses.   Selling,  general  and
administrative  expenses  for the year ended June 30, 1998  increased  by 16% to
$6,426,000  as compared to $5,528,000  fiscal 1997.  The increase was due to (i)
increased  investor and public  relations  activities,  and (ii) consulting fees
related to the  development  of a strategic  business plan for the Company's SCA
protein technology.

     Selling,  general and  administrative  expenses for the year ended June 30,
1997 decreased by 8% to $5,528,000 from $6,011,000 for fiscal 1996. The decrease
was due to (i) reductions in personnel and related costs,  such as payroll taxes
and benefits, and (ii) other cost containment measures taken by the Company.

     Other  Income/Expense.   Other  income/expense  decreased  by  $141,000  to
$464,000 for the year ended June 30, 1998 as compared to $605,000 last year. The
decrease was due  principally to a decline in interest  income due to a decrease
in interest bearing investments.

     Other income/expense decreased by $1,218,000 to $605,000 for the year ended
June 30, 1997 as compared to  $1,823,000  for the year ended June 30, 1996.  The
decrease was due to the recognition of approximately  $1,313,000 as other income
during the year ended  June 30,  1996.  The  $1,313,000  represented  the unused
portion of an advance  received under a development  and license  agreement with
Sanofi Winthrop.

     In June 1997, the Financial Accounting Standards Board issued Statements of
Financial  Accounting  Standards  No. 130 (SFAS 130),  "Reporting  Comprehensive
Income" and No. 131 (SFAS 131), "Disclosures about Segments of an Enterprise and
Related  Information."  In accordance with the effective dates, the Company will
adopt  SFAS 130 and SFAS 131 for the  fiscal  year  ending  June 30,  1999.  The
Company is currently  evaluating the impact of the disclosure  requirements  for
SFAS 130 and SFAS 131.  These  statements  are not  expected  to have a material
impact on the Company's Consolidated Financial Statements.

Liquidity and Capital Resources

     Total cash  reserves,  including  cash and cash  equivalents as of June 30,
1998 were  $6,478,000.  The Company  completed a private  placement  during July
1998,  in which the Company  sold  3,983,000  shares of Common  Stock to a small
group of investors resulting in net proceeds of approximately $17,600,000. Total
cash  reserves,  as of June 30,  1998,  after  giving  proforma  effect  to this
financing, were approximately  $24,078,000.  The Company invests its excess cash
in  a  portfolio  of  high-grade   marketable   securities   and  United  States
government-backed securities.

     The Company's  Amended RPR U.S. License Agreement for ONCASPAR provides for
a payment of  $3,500,000  in advance  royalties  which was received  from RPR in
January 1995. Royalties due under the Amended RPR U.S. License Agreement will be
offset against an original  credit of $5,970,000,  which  represents the royalty

                                       24
<PAGE>


advance  plus  reimbursement  of  certain  amounts  due RPR under  the  previous
agreement  and interest  expense,  before cash  payments  will be made under the
agreement.  The  royalty  advance is shown as a  long-term  liability,  with the
corresponding  current portion  included in accrued expenses on the consolidated
balance  sheets  and will be  reduced  as  royalties  are  recognized  under the
agreement.  Through June 30,  1998,  an  aggregate  of  $4,256,000  in royalties
payable by RPR has been offset against the original credit.

     As of June 30, 1998,  942,808 shares of Series A Preferred  Shares had been
converted  into  3,097,955  shares of Common  Stock.  Accrued  dividends  on the
converted  Series A Preferred Shares in the aggregate of $1,824,000 were settled
by the  issuance  of  235,231  shares  of Common  Stock.  The  Company  does not
presently intend to pay cash dividends on the Series A Preferred  Shares.  As of
June 30, 1998,  there were accrued and unpaid dividends  totaling  $1,770,000 on
the Series A Preferred  Shares.  These  dividends  are payable in cash or Common
Stock at the Company's  option and accrue on the outstanding  Series A Preferred
Shares at the rate of $214,000 per year.

     To date, the Company's sources of cash have been the proceeds from the sale
of its stock through public and private  placements,  sales of ADAGEN,  sales of
ONCASPAR,  sales of its products for research  purposes,  contract  research and
development fees, technology transfer and license fees and royalty advances. The
Company's  current  sources of  liquidity  are its cash,  cash  equivalents  and
interest  earned on such cash  reserves,  proceeds  from the recently  completed
private placement of Common Stock, sales of ADAGEN, sales of ONCASPAR,  sales of
its products for research  purposes and license  fees.  Based upon its currently
planned  research and  development  activities and related costs and its current
sources of liquidity,  the Company anticipates its current cash reserves will be
sufficient to meet its capital and operational  requirements for the foreseeable
future.

     Upon  exhaustion  of the  Company's  current cash  reserves,  the Company's
continued  operations will depend on its ability to realize significant revenues
from the commercial sale of its products,  raise additional funds through equity
or debt  financing,  or obtain  significant  licensing,  technology  transfer or
contract  research and  development  fees.  There can be no assurance that these
sales, financings or revenue generating activities will be successful.

     In  management's  opinion,  the effect of inflation on the  Company's  past
operations has not been significant.

Year 2000

     The Company has completed a review of its business  systems,  including its
computer systems and manufacturing  equipment, and has queried its customers 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.  Based on this review,  the Company has
implemented a plan to achieve year 2000 compliance. The Company believes that it
will achieve year 2000 compliance no later than September 1999 in a manner which
will be non-disruptive to its operations. In addition, the Company has commenced
work on various types of contingency planning to address potential problem areas
with internal systems and with suppliers and other third parties,  although such
plans  have not yet been  determined.  Year 2000  compliance  should  not have a
material  adverse  effect on the  Company,  including  the  Company's  financial
condition,  results of operations or cash flow.  The Company  estimates the cost
(including   historical   costs  to  date)  of  its  year  2000  efforts  to  be
approximately $400,000. The total cost estimate is based on management's current
assessment and is subject to change.

     However,  the Company may encounter  problems with suppliers and or revenue
sources which could adversely affect the Company's financial condition,  results
of operations or cash flow. The Company cannot accurately predict the occurrence
and or  outcome  of any such  problems,  nor can the  dollar  amount of any such
problem be estimated. In addition, there can be no assurance that the failure to
ensure year 2000  compliance by a third party would not have a material  adverse
effect on the Company.


                                       25
<PAGE>


Item 7A. Quantitative and Qualitative Disclosure About Market Risk

     Not applicable.

Item 8. Financial Statements and Supplementary Data

     The response to this item is submitted as a separate section of this report
commencing on Page F-1.


Item 9. Changes in and Disagreements With Accountants
        on Accounting and Financial Disclosure       

     Not applicable.


                                       26
<PAGE>


                                    PART III

     The information  required by Item 10 - Directors and Executive  Officers of
the Registrant;  Item 11 - Executive Compensation;  Item 12 - Security Ownership
of Certain Beneficial Owners and Management; and Item 13 - Certain Relationships
and Related  Transactions is incorporated into Part III of this Annual Report on
Form 10-K by reference to the Company's  Proxy  Statement for the Annual Meeting
of Stockholders scheduled to be held on December 1, 1998.



                                       27
<PAGE>


                                     PART IV

Item 14. Exhibits, Financial Statement Schedules,
         and Reports on Form 8-K               

     (a)(1) and (2).  The  response to this portion of Item 14 is submitted as a
separate section of this report commencing on page F-1.

     (a)(3)  and  (c).  Exhibits  (numbered  in  accordance  with  Item  601  of
Regulation S-K).

<TABLE>
<CAPTION>
                                                                                              Page Number or 
     Exhibit                                                                                 Incorporation By
     Number            Description                                                              Reference      
     ------            -----------                                                           ----------------
<S>         <C>                                                                                <C>    
      3(i)  Certificate of Incorporation, as amended                                                    ^

     3(ii)  By-laws, as amended                                                                    *(4.2)

    3(iii)  Certificate of Designations, Preferences and Rights of 
              Series D Convertible Preferred Stock                                             ^^^^3(iii)

     3(iv)  Amendment to Certificate of Incorporation dated January 5, 1998                      ###3(iv)

      10.0  Employment Agreement dated March 25, 1994 with Peter G. Tombros                      #(10.17)

      10.1  Form of Change of Control Agreements dated as of January 20, 1995 
              entered into with the Company's Executive Officers                                  ~(10.2)

      10.2  Lease - 300-C Corporate Court, South Plainfield, New Jersey                         ***(10.3)

      10.4  Lease Termination Agreement dated March 31, 1995 for
              20 Kingsbridge Road and 40 Kingsbridge Road, Piscataway, New Jersey                 ~(10.6)

      10.5  Option Agreement dated April 1, 1995 regarding 20 Kingsbridge Road,
              Piscataway, New Jersey                                                              ~(10.7)

      10.6  Form of Lease - 40 Cragwood Road, South Plainfield, New Jersey                     ****(10.9)

      10.7  Lease 300A-B Corporate Court, South Plainfield, New Jersey                         +++(10.10)

      10.8  Stock Purchase Agreement dated March 5, 1987 between the Company and
              Eastman Kodak Company                                                            ****(10.7)

      10.9  Amendment dated June 19, 1989 to Stock Purchase Agreement between the
              Company and Eastman Kodak Company                                                 **(10.10)

     10.10    Form of Stock  Purchase  Agreement  between the Company and
              the purchasers of the Series A Cumulative
              Convertible Preferred Stock                                                        +(10.11)

     10.11  Amendment to License Agreement and Revised License Agreement
              between the Company and RCT dated April 25, 1985                                 ++++(10.5)

     10.12  Amendment dated as of May 3, 1989 to Revised License Agreement
              dated April 25, 1985 between the Company and Research Corporation                 **(10.14)

     10.13  License Agreement dated September 7, 1989 between the Company and
              Research Corporation Technologies, Inc.                                           **(10.15)

     10.14  Master Lease Agreement and Purchase Leaseback Agreement dated
              October 28, 1994 between the Company and Comdisco, Inc.                           ##(10.16)

     10.15  Employment Agreement with Peter G. Tombros dated as of
              April 5, 1997                                                                   ^^^^(10.15)

     10.16  Stock Purchase Agreement dated as of June 30, 1995                                 ~~~(10.16)

     10.17  Securities Purchase Agreement dated as of January 31, 1996                         ~~~(10.17)

     10.18  Registration Rights Agreements dated as of January 31, 1996                        ~~~(10.18)
</TABLE>


                                       28
<PAGE>


<TABLE>
<S>         <C>                                                                                <C> 
     10.19  Warrants dated as of February 7, 1996 and issued pursuant to the 
              Securities Purchase Agreement dated as of January 31, 1996                       ~~~(10.19)

     10.20  Securities Purchase Agreement dated as of March 15, 1996                             ^(10.20)

     10.21  Registration Rights Agreement dated as of March 15, 1996                             ^(10.21)

     10.22  Warrant dated as of March 15, 1996 and issued pursuant to the 
            Securities Purchase Agreement dated as of March 15, 1996                             ^(10.22)

     10.23  Amendment dated March 25, 1994 to License Agreement dated
              September 7, 1989 between the Company and Research Corporation
              Technologies, Inc.                                                                ^^(10.23)

     10.24  Independent Directors' Stock Plan                                                   ^^(10.24)

     10.25  Stock Exchange Agreement dated February 28, 1997, by and between the
              Company and GFL Performance Fund Ltd.                                            ^^^(10.25)

     10.26  Agreement Regarding Registration Rights Under Registration Rights 
              Agreement dated March 10, 1997, by and between the Company and 
              Clearwater Fund IV LLC                                                           ^^^(10.26)

     10.27  Common Stock Purchase Agreement dated June 25, 1998                               ^^^^(10.27)

     10.28  Placement Agent Agreement dated June 25, 1998 with SBC Warburg 
              Dillon Read Inc.                                                                          o

      21.0  Subsidiaries of Registrant.                                                                 o

      23.0  Independent Auditor's Consent                                                               o

      27.0  Financial Data Schedule                                                                     o

      99.0  Factors to Consider in Connection with Forward-Looking Statements                           o
</TABLE>


o         Filed herewith.

*         Previously filed as an exhibit to the Company's Registration Statement
          on Form S-2 (File No. 33-34874) and  incorporated  herein by reference
          thereto.

**        Previously  filed as exhibits to the  Company's  Annual Report on Form
          10-K for the fiscal year ended June 30, 1989 and  incorporated  herein
          by reference thereto.

***       Previously filed as an exhibit to the Company's Registration Statement
          on  Form  S-18  (File  No.  2-88240-NY)  and  incorporated  herein  by
          reference thereto.

****      Previously filed as exhibits to the Company's  Registration  Statement
          on  Form  S-1  (File  No.  2-96279)  filed  with  the  Commission  and
          incorporated herein by reference thereto.

+         Previously filed as an exhibit to the Company's Registration Statement
          on Form  S-1  (File  No.  33-39391)  filed  with  the  Commission  and
          incorporated herein by reference thereto.

+++       Previously  filed as an exhibit to the Company's Annual Report on Form
          10-K for the fiscal year ended June 30, 1993 and  incorporated  herein
          by reference thereto.

++++      Previously  filed as an exhibit to the Company's Annual Report on Form
          10-K for the fiscal year ended June 30, 1985 and  incorporated  herein
          by reference thereto.

#         Previously filed as an exhibit to the Company's Current Report on Form
          8-K dated April 5, 1994 and incorporated herein by reference thereto.

##        Previously  filed as an exhibit to the Company's  Quarterly  Report on
          Form 10-Q for the quarter  ended  December  31, 1994 and  incorporated
          herein by reference thereto.


                                       29
<PAGE>


###       Previously  filed as an exhibit to the Company's  Quarterly  Report on
          Form 10-Q for the quarter  ended  December  31, 1997 and  incorporated
          herein by reference thereto.

~         Previously  filed as an exhibit to the Company's  Quarterly  Report on
          Form 10-Q for the quarter ended March 31, 1995 and incorporated herein
          by reference thereto.

~~        Previously  filed as an exhibit to the Company's Annual Report on Form
          10-K for the fiscal year ended June 30, 1995 and  incorporated  herein
          by reference thereto.

~~~       Previously  filed as an exhibit to the Company's  Quarterly  Report on
          Form 10-Q for the quarter  ended  December  31, 1995 and  incorporated
          herein by reference thereto.

^         Previously  filed as an exhibit to the Company's  Quarterly  Report on
          Form 10-Q for the quarter ended March 31, 1996 and incorporated herein
          by reference thereto.

^^        Previously  filed as an exhibit to the Company's  Quarterly  Report on
          Form 10-Q for the quarter  ended  December  31, 1996 and  incorporated
          herein by reference thereto.

^^^       Previously  filed as an exhibit to the Company's  Quarterly  Report on
          Form 10-Q for the quarter ended March 31, 1997 and incorporated herein
               by reference thereto.

^^^^      Previously  filed as an exhibit to the Company's Annual Report on Form
          10-K for the year  ended  June 30,  1997 and  incorporated  herein  by
          reference thereto.

^^^^^     Previously filed as an exhibit to the Company's Registration Statement
          on Form  S-3  (File  No.  333-58269)  filed  with the  Commission  and
          incorporated herein by reference thereto.


     (b) Reports on Form 8-K

     On June 30, 1998, the Company filed with the Commission a Current Report on
Form  8-K  dated  April  14,  1998  related  to the  following  items:  (i)  the
appointment of Richard P. Voss to the newly created  position of Vice President,
Business  Development,  (ii)  arbitration  proceedings  between  the Company and
Yoshitomi  Pharmaceuticals  Industries,  Ltd.  ("Yoshitomi"),   related  to  the
resolution of a dispute over the extent of royalties  payable to the Company for
a research and license  agreement for the  development  of a  recombinant  Human
Serum Albumin ("rHSA"), and (iii) a Notice of Allowance from the U.S. Patent and
Trademark Office for a patent on the Company's Pro Drug/Transport Technology.


                                       30
<PAGE>


                                   Signatures

     Pursuant  to the  requirements  of  Section  13 or 15(d) of the  Securities
Exchange Act of 1934, the registrant has duly caused this report to be signed on
its behalf by the undersigned, thereunto duly authorized.

                                                    ENZON, INC.


Dated: September 28, 1998                           /s/ Peter G. Tombros  
                                                   -----------------------
                                                   By: Peter G. Tombros
                                                   President and Chief
                                                   Executive Officer


     Pursuant to the  requirements of the Securities  Exchange Act of 1934, this
Annual  Report has been signed below by the  following  persons on behalf of the
Registrant and in the capacities and on the dates indicated:

<TABLE>
<CAPTION>
            Name                           Title                             Date
            ----                           -----                             ----
<S>                                <C>                                  <C> 
  /s/ Peter G. Tombros             President, Chief Executive           September 28, 1998
- ---------------------------        Officer and Director          
Peter G. Tombros                   (Principal Executive Officer) 
                                   

 /s/ Kenneth J. Zuerblis           Vice President, Finance              September 28, 1998
- ---------------------------        and Chief Financial Officer 
Kenneth J. Zuerblis                (Principal Financial and    
                                   Accounting Officer)         
                                   

  /s/ Randy H. Thurman             Chairman of the Board                September 28, 1998
- ---------------------------
Randy H. Thurman

 /s/ Rolf A. Classon               Director                             September 28, 1998
- ---------------------------
Rolf A. Classon

  /s/ Rosina B. Dixon              Director                             September 28, 1998
- ---------------------------
Rosina B. Dixon

  /s/ David W. Golde               Director                             September 28, 1998
- ---------------------------
David W. Golde

  /s/ Robert LeBuhn                Director                             September 28, 1998
- ---------------------------
Robert LeBuhn

 /s/  A.M. "Don" MacKinnon         Director                             September 28, 1998
- ----------------------------
A.M. "Don" MacKinnon
</TABLE>


<PAGE>


                          ENZON, INC. AND SUBSIDIARIES



                                      Index

                                                                            Page
                                                                            ----

Independent Auditors' Report                                                 F-2

Consolidated Financial Statements:
   Consolidated  Balance  Sheets - June 30, 1998  and  1997                  F-3
   Consolidated Statements of Operations - Years ended
     June 30, 1998, 1997 and 1996                                            F-4
   Consolidated Statements of Stockholders' Equity -
    Years ended June 30, 1998, 1997 and 1996                                 F-5
   Consolidated Statements of Cash Flows - Years ended
     June 30, 1998, 1997 and 1996                                            F-7
   Notes to Consolidated Financial Statements - Years
     ended June 30, 1998, 1997 and 1996                                      F-8



                                      F-1
<PAGE>


                          INDEPENDENT AUDITORS' REPORT


The Board of Directors and Stockholders
Enzon, Inc.:

We have  audited  the  consolidated  financial  statements  of Enzon,  Inc.  and
subsidiaries as listed in the accompanying  index. These consolidated  financial
statements   are  the   responsibility   of  the   Company's   management.   Our
responsibility  is  to  express  an  opinion  on  these  consolidated  financial
statements based on our audits.

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

In our opinion, the consolidated  financial statements referred to above present
fairly,  in all material  respects,  the financial  position of Enzon,  Inc. and
subsidiaries  as of June 30, 1998 and 1997, and the results of their  operations
and their cash flows for each of the years in the  three-year  period ended June
30, 1998, in conformity with generally accepted accounting principles.


                                                           KPMG Peat Marwick LLP



Short Hills, New Jersey
September 8, 1998


                                      F-2
<PAGE>


                          ENZON, INC. AND SUBSIDIARIES
                           CONSOLIDATED BALANCE SHEETS
                             June 30, 1998 and 1997

<TABLE>
<CAPTION>
                                                                                                     1998                  1997
                                                                                                 -------------        -------------
<S>                                                                                              <C>                  <C>          
ASSETS
 Current assets:
  Cash and cash equivalents                                                                      $   6,478,459        $   8,315,752
  Accounts receivable                                                                                2,300,046            2,433,762
  Inventories                                                                                        1,022,530              859,873
  Prepaid expenses and other current assets                                                            447,952               87,732
                                                                                                 -------------        -------------

     Total current assets                                                                           10,248,987           11,697,119
                                                                                                 -------------        -------------
Property and equipment                                                                              15,134,075           15,676,525
  Less accumulated depreciation and amortization                                                    13,368,330           12,923,802
                                                                                                 -------------        -------------
                                                                                                     1,765,745            2,752,723
                                                                                                 -------------        -------------
Other assets:
  Investments                                                                                           69,002               78,293
  Deposits and deferred charges                                                                        464,747               34,575
  Patents, net                                                                                       1,192,897            1,442,568
                                                                                                 -------------        -------------
                                                                                                     1,726,646            1,555,436
                                                                                                 -------------        -------------
     Total assets                                                                                $  13,741,378        $  16,005,278
                                                                                                 =============        =============



LIABILITIES AND STOCKHOLDERS' EQUITY

Current liabilities:
   Accounts payable                                                                              $   1,711,856        $   1,910,737
   Accrued expenses                                                                                  4,375,822            3,504,966
                                                                                                 -------------        -------------
      Total current liabilities                                                                      6,087,678            5,415,703
                                                                                                 -------------        -------------
 Accrued rent                                                                                          727,160              870,012
 Royalty advance - RPR                                                                                      --            1,177,682
                                                                                                 -------------        -------------
                                                                                                       727,160            2,047,694
                                                                                                 -------------        -------------
Commitments and contingencies

Stockholders' equity:
  Preferred stock-$.01  par  value, authorized  3,000,000 shares; issued and
   outstanding 107,000 shares in 1998 and 109,000 in 1997 (liquidation
   preferences aggregating $2,675,000 in 1998
   and $2,725,000 in 1997)                                                                               1,070                1,090
  Common stock-$.01 par value, authorized 60,000,000 shares;
   issued and outstanding 31,341,353 shares in 1998 and
   30,797,735 shares in 1997                                                                           313,414              307,977
  Additional paid-in capital                                                                       123,453,874          121,426,159
  Accumulated deficit                                                                             (116,841,818)        (113,193,345)
                                                                                                 -------------        -------------
     Total stockholders' equity                                                                      6,926,540            8,541,881
                                                                                                 -------------        -------------
     Total liabilities and stockholders' equity                                                  $  13,741,378        $  16,005,278
                                                                                                 =============        =============
</TABLE>


              The accompanying notes are an integral part of these
                       consolidated financial statements.


                                      F-3
<PAGE>


                          ENZON, INC. AND SUBSIDIARIES
                      CONSOLIDATED STATEMENTS OF OPERATIONS
                    Years ended June 30, 1998, 1997 and 1996

<TABLE>
<CAPTION>
                                                                  1998                  1997                 1996
                                                              ------------          ------------          ------------
<S>                                                           <C>                   <C>                   <C>         
Revenues:
  Sales                                                       $ 12,312,730          $ 11,595,985          $ 10,501,985
  Contract revenue                                               2,331,302             1,131,067             2,179,296
                                                              ------------          ------------          ------------
     Total revenues                                             14,644,032            12,727,052            12,681,281
                                                              ------------          ------------          ------------
Costs and expenses:
  Cost of sales                                                  3,645,281             3,840,198             3,545,341
  Research and development expenses                              8,653,567             8,520,366            10,123,525
  Selling, general and administrative expenses                   6,426,241             5,528,174             6,010,639
                                                              ------------          ------------          ------------
     Total costs and expenses                                   18,725,089            17,888,738            19,679,505
                                                              ------------          ------------          ------------
     Operating loss                                             (4,081,057)           (5,161,686)           (6,998,224)
                                                              ------------          ------------          ------------
Other income (expense):
  Interest and dividend income                                     460,922               584,384               449,855
  Interest expense                                                 (13,923)              (14,891)              (12,886)
  Other                                                             16,925                35,168             1,385,976
                                                              ------------          ------------          ------------
                                                                   463,924               604,661             1,822,945
                                                              ------------          ------------          ------------
     Net loss                                                 ($ 3,617,133)         ($ 4,557,025)         ($ 5,175,279)
                                                              ============          ============          ============
Basic and diluted loss per common share                       ($      0.12)         ($      0.16)         ($      0.20)
                                                              ============          ============          ============
Weighted average number of common
  shares outstanding during the period                          31,092,369            29,045,605            26,823,142
                                                              ============          ============          ============
</TABLE>

              The accompanying notes are an integral part of these
                       consolidated financial statements.


                                      F-4
<PAGE>


                          ENZON, INC. AND SUBSIDIARIES
                 CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
                    Years ended June 30, 1998, 1997 and 1996

<TABLE>
<CAPTION>
                                                         Preferred stock                             Common Stock
                                               ----------------------------------      --------------------------------------
                                                  Amount      Number of       Par       Amount         Number of         Par
                                                per share      Shares        Value     per share         Shares          Value     
                                                ---------      ------        -----     ---------         ------          -----     
<S>                                             <C>            <C>           <C>         <C>            <C>            <C>          
Balance, July 1, 1995                               --         109,000       $1,090                     26,328,874     $263,289     
Common stock issued for exercise of
 non-qualified stock options                        --              --           --      $2.54              15,980          160     
Issuance of common stock warrants                   --              --           --         --                  --           --     
Proceeds from Private Placement,
 January 1996                                  $100.00          40,000          400       2.74           1,094,890       10,949     
Proceeds from Private Placement,
 March 1996                                     100.00          20,000          200       3.75             266,667        2,666     
Consulting expense for issuance of stock
 options                                            --              --           --         --                  --           --     
Donation of common stock                            --              --           --         --                 (15)          --     
Net loss                                            --              --           --         --                  --           --     
                                                               -------       ------                     ----------     --------     
Balance, June 30, 1996                                         169,000       $1,690                     27,706,396     $277,064     
Common stock issued for exercise of                                                                                                 
 non-qualified stock options                        --              --           --       2.36              11,219          112     
Common stock issued for Independent                                                                                                 
 Directors' Stock Plan                              --              --           --       2.97              25,903          259     
Consulting expense for issuance of stock                                                                                            
 options                                            --              --           --         --                  --           --     
Common stock issued on conversion of                                                                                                
 Series B Preferred Stock                         1.95         (40,000)        (400)      1.95           2,038,989       20,390     
Common stock issued on conversion of                                                                                               
 Series D Preferred Stock                         1.97         (20,000)        (200)      1.97           1,015,228       10,152     
Net loss                                            --              --           --         --                  --           --     
                                                               -------       ------                     ----------     --------     
     Balance, June 30, 1997, carried forward                   109,000       $1,090                     30,797,735     $307,977     
                                                                                                                                  
<CAPTION>
                                                   Additional
                                                     paid-in             Accumulated
                                                     capital               Deficit                 Total
                                                     -------               -------                 -----
<S>                                              <C>                   <C>                     <C>        
Balance, July 1, 1995                            $111,494,180          ($103,461,041)          $8,297,518
Common stock issued for exercise of
 non-qualified stock options                           40,376                     --               40,536
Issuance of common stock warrants                     246,000                     --              246,000
Proceeds from Private Placement,
 January 1996                                       6,661,006                     --            6,672,355
Proceeds from Private Placement,
 March 1996                                         2,768,920                     --            2,771,786
Consulting expense for issuance of stock
 options                                               61,542                     --               61,542
Donation of common stock                                   --                     --                   --
Net loss                                                   --             (5,175,279)          (5,175,279)
                                                 ------------          -------------           -----------
Balance, June 30, 1996                           $121,272,024          ($108,636,320)         $12,914,458
Common stock issued for exercise of              
 non-qualified stock options                           26,499                     --               26,611
Common stock issued for Independent             
 Directors' Stock Plan                                 76,598                     --               76,857
Consulting expense for issuance of stock       
 options                                               80,984                     --               80,984
Common stock issued on conversion of                 
 Series B Preferred Stock                             (19,993)                    --                   (3)
Common stock issued on conversion of           
 Series D Preferred Stock                              (9,953)                    --                   (1)
Net loss                                                   --             (4,557,025)          (4,557,025)
                                                 ------------          -------------           -----------
     Balance, June 30, 1997, carried forward     $121,426,159          ($113,193,345)          $8,541,881
</TABLE>


              The accompanying notes are an integral part of these
                       consolidated financial statements.
                                                                     (continued)



                                      F-5
<PAGE>


                          ENZON, INC. AND SUBSIDIARIES
           CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (continued)
                    Years ended June 30, 1998, 1997 and 1996

<TABLE>
<CAPTION>
                                                            Preferred stock                             Common Stock
                                                  ----------------------------------       --------------------------------------
                                                   Amount      Number of        Par         Amount       Number of         Par
                                                  per share      Shares        Value       per share       Shares          Value    
                                                  ---------      ------        -----       ---------       ------          -----    
<S>                                                 <C>         <C>           <C>           <C>         <C>               <C>       
Balance, June 30, 1997, brought forward                         109,000       $1,090           --       30,797,735        $307,977  
Common stock issued for exercise of non-
 qualified stock options                               --            --           --          2.23         505,072           5,051  
Common stock issued on conversion of
 Preferred Stock                                    25.00        (2,000)         (20)        11.00           4,544              45  
Dividends issued on Preferred stock                    --            --           --         11.00           2,848              29  
Common stock issued for Independent
 Directors' Stock Plan                                 --            --           --          4.11          16,904             169  
Common stock issued to consultants                     --            --           --          4.77          14,259             143  
Consulting expense for issuance of stock
 options                                               --            --           --            --              --              --  
Donation of Common Stock                               --            --           --            --              (9)             --  
Net loss                                               --            --           --            --              --              --  
                                                                -------       ------                    ----------        --------  
     Balance, June 30, 1998                                     107,000       $1,070                    31,341,353        $313,414  
                                                                =======       ======                    ==========        ========  
                                                                                                                          

<CAPTION>
                                                   Additional
                                                     paid-in             Accumulated
                                                     capital               Deficit            Total
                                                     -------               -------            -----
Balance, June 30, 1997, brought forward            $121,426,159       ($113,193,345)       $8,541,881
Common stock issued for exercise of non-
 qualified stock options                              1,653,557                  --         1,658,608
Common stock issued on conversion of
 Preferred Stock                                            (42)                 --               (17)
Dividends issued on Preferred stock                      31,300             (31,340)              (11)
Common stock issued for Independent
 Directors' Stock Plan                                   69,231                  --            69,400
Common stock issued to consultants                       67,854                  --            67,997
Consulting expense for issuance of stock
 options                                                205,815                  --           205,815
Donation of Common Stock                                     --                  --               --
Net loss                                                     --          (3,617,133)       (3,617,133)
                                                   ------------       -------------        ----------
     Balance, June 30, 1998                        $123,453,874       ($116,841,818)       $6,926,540
                                                   ============       =============        ==========
                                                  
</TABLE>


              The accompanying notes are an integral part of these
                       consolidated financial statements.

                                      F-6
<PAGE>


                          ENZON, INC. AND SUBSIDIARIES
                      CONSOLIDATED STATEMENTS OF CASH FLOWS
                    Years Ended June 30, 1998, 1997 and 1996

<TABLE>
<CAPTION>
                                                                              1998            1997             1996
                                                                          ------------    ------------    ------------
<S>                                                                        <C>             <C>             <C>         
Cash flows from operating activities:
   Net loss                                                                ($3,617,133)    ($4,557,025)    ($5,175,279)
   Adjustments to reconcile net loss to net cash used in
    operating activities:
        Decrease in liability recognized pursuant to Sanofi Agreement               --              --      (1,312,829)
        Depreciation and amortization                                        1,217,423       1,653,331       2,051,735
        Loss (gain) on retirement of assets                                     97,037         (35,168)         69,444
        Non-cash expense for issuance of common stock and stock options
           options                                                             343,212         157,841          61,542
        Changes in assets and liabilities, excluding acquisition items:
           Decrease (increase) in accounts receivable                          133,716        (310,071)        238,586
           (Increase) decrease in inventories                                 (162,657)        125,505        (192,925)
           (Increase) decrease in prepaid expenses and other current
            assets                                                            (360,220)        346,586        (249,092)
           (Increase) decrease in other assets                                (430,172)         21,370          (8,995)
           (Decrease) increase in accounts payable                            (198,881)       (168,187)        516,956
           Increase  (decrease) in accrued expenses                            796,403        (522,761)        102,700
           Decrease in accrued rent                                           (142,852)       (110,896)        (25,600)
           Decrease in royalty advance - RPR                                (1,101,501)       (780,081)       (867,922)
           Decrease in other liabilities                                            --          (1,728)         (2,348)
                                                                          ------------    ------------    ------------
              Net cash used in operating activities                         (3,425,625)     (4,181,284)     (4,794,027)
                                                                          ------------    ------------    ------------
 Cash flows from investing activities:
   Capital expenditures                                                       (160,940)       (873,754)       (136,789)
   Proceeds from sale of equipment                                              83,129         680,481          11,283
   Decrease in investments                                                       9,291              --              -- 
                                                                          ------------    ------------    ------------
              Net cash used in investing activities                            (68,520)       (193,273)       (125,506)
                                                                          ------------    ------------    ------------
 Cash flows from financing activities:
   Proceeds from issuance of common stock, preferred stock
    and warrants                                                             1,658,580          26,607       9,484,677
   Principal payments of obligations under capital leases                       (1,728)         (2,348)         (2,083)
                                                                          ------------    ------------    ------------
              Net cash provided by financing activities                      1,656,852          24,259       9,482,594
                                                                          ------------    ------------    ------------
              Net (decrease) increase in cash and cash equivalents          (1,837,293)     (4,350,298)      4,563,061
   Cash and cash equivalents at beginning of period                          8,315,752      12,666,050       8,102,989
                                                                          ------------    ------------    ------------
   Cash and cash equivalents at end of period                               $6,478,459      $8,315,752     $12,666,050
                                                                          ============    ============    ============
</TABLE>

              The accompanying notes are an integral part of these
                       consolidated financial statements.


                                      F-7
<PAGE>


                          ENZON, INC. AND SUBSIDIARIES
                   Notes to Consolidated Financial Statements

                    Years ended June 30, 1998, 1997 and 1996

(1)  Company Overview

     Enzon, Inc. ("Enzon" or the "Company") is a biopharmaceutical  company that
develops,  manufactures and markets enhanced  therapeutics for  life-threatening
diseases  through the application of its proprietary  technologies.  The Company
was originally incorporated in 1981. To date, the Company's sources of cash have
been the  proceeds  from the sale of its  stock  through  public  offerings  and
private  placements,  sales of  ADAGEN(R),  sales of  ONCASPAR(R),  sales of its
products  for  research  purposes,   contract  research  and  development  fees,
technology  transfer and license fees, and royalty  advances.  The manufacturing
and  marketing  of  pharmaceutical  products in the United  States is subject to
stringent governmental regulation, and the sale of any of the Company's products
for use in humans in the United  States will  require the prior  approval of the
United States Food and Drug Administration ("FDA"). To date, ADAGEN and ONCASPAR
are the only  products of the Company  which have been approved for marketing by
the FDA.

(2)  Summary of Significant Accounting Policies

     Consolidated Financial Statements

     The consolidated  financial  statements include the accounts of the Company
and its wholly-owned  subsidiaries.  All intercompany  transactions and balances
have been eliminated in consolidation.  The preparation of financial  statements
in conformity with generally accepted accounting  principles requires management
to make estimates and assumptions that affect the reported amounts of assets and
liabilities  and disclosure of contingent  assets and liabilities at the date of
the  financial  statements  and the  reported  amounts of revenues  and expenses
during the reporting period. Actual results could differ from those estimates.

Investments

     Cash  equivalents  include  investments  which  consist  primarily  of debt
securities and time deposits. The Company invests its excess cash in a portfolio
of marketable  securities of  institutions  with strong credit  ratings and U.S.
Government backed securities.

     The Company  classifies  its  investment  securities  as  held-to-maturity.
Held-to-maturity  securities  are those  securities  which the  Company  has the
ability and intent to hold to maturity. Held-to-maturity securities are recorded
at cost which  approximates  the fair value of the  investments at June 30, 1998
and 1997.

Inventory Costing and Idle Capacity

     Inventories  are stated at the lower of cost or market.  Cost is determined
using the  first-in,  first-out  method and includes the cost of raw  materials,
labor and overhead.

     Costs associated with idle capacity at the Company's manufacturing facility
are charged to cost of sales as incurred.


                                      F-8
<PAGE>


                          ENZON, INC. AND SUBSIDIARIES
              Notes to Consolidated Financial Statements, Continued



Patents

     The  Company  has  licensed,  and been  issued,  a number of patents in the
United States and other countries and has other patent  applications  pending to
protect its  proprietary  technology.  Although  the Company  believes  that its
patents provide adequate  protection for the conduct of its business,  there can
be no  assurance  that  such  patents  will  be  of  substantial  protection  or
commercial benefit to the Company,  will afford the Company adequate  protection
from competing products,  or will not be challenged or declared invalid, or that
additional United States patents or foreign patent equivalents will be issued to
the Company.  The degree of patent protection to be afforded to biotechnological
inventions  is  uncertain,  and  the  Company's  products  are  subject  to this
uncertainty.

     Patents  related to the  acquisition  of Enzon Labs  Inc.,  formerly  Genex
Corporation,  were recorded at their fair value at the date of  acquisition  and
are being amortized over the estimated  useful lives of the patents ranging from
8 to 17  years.  Accumulated  amortization  as of June  30,  1998  and  1997 was
$956,000 and $875,000, respectively.

     Costs related to the filing of patent applications related to the Company's
products and technology are expensed as incurred.

Property and Equipment

     Property and equipment are carried at cost.  Depreciation is computed using
the straight-line  method. When assets are retired or otherwise disposed of, the
cost and related accumulated depreciation are removed from the accounts, and any
resulting gain or loss is recognized in operations  for the period.  The cost of
repairs  and  maintenance  is charged to  operations  as  incurred;  significant
renewals and betterments are capitalized.

Long-lived Assets

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

Revenue Recognition

     Reimbursement  from  third  party  payors  for  ADAGEN  is  handled  on  an
individual  basis  due to  the  high  cost  of  treatment  and  limited  patient
population.  Because  of the  uncertainty  of  reimbursement  and the  Company's
commitment  of supply to the  patient  regardless  of whether or not the Company
will  be  reimbursed,  revenues  for the  sale of  ADAGEN  are  recognized  when
reimbursement from third party payors becomes likely.



                                      F-9
<PAGE>


                          ENZON, INC. AND SUBSIDIARIES
              Notes to Consolidated Financial Statements, Continued


     Revenues from the sale of the Company's  other  products are  recognized at
the time of shipment, and provision is made for estimated returns.

     Contract revenues are recorded as the earnings process is completed.

     Royalties under the Company's  license agreement with  Rhone-Poulenc  Rorer
Pharmaceuticals,  Inc. ("RPR") (See Note 11), related to the sale of ONCASPAR by
RPR, are recognized when earned.

Research and Development

     Research and development costs are expensed as incurred.

Stockholders' Equity

     The Company maintains a Non-Qualified  Stock Option Plan (the "Stock Option
Plan") for which it applies  Accounting  Principles Board ("APB") Opinion No. 25
,"Accounting  for Stock Issued to  Employees,"  and related  interpretations  in
accounting  for the Stock Option Plan.  Stock  options  issued to employees  are
granted with an exercise price equal to the market price and in accordance  with
APB No. 25, compensation expense is not recognized.

Cash Flow Information

     The Company considers all highly liquid securities with original maturities
of three months or less to be cash equivalents.

     During the year ended June 30,  1998,  2,000  shares of Series A Cumulative
Convertible  Preferred Stock ("Series A Preferred  Stock" or "Series A Preferred
Shares") were  converted to 4,544 shares of Common Stock.  Accrued  dividends of
$31,000 on the Series A Preferred  Shares that were  converted  were  settled by
issuing  2,848  shares  of  Common  Stock and cash  payments  totalling  $28 for
fractional shares. There were no conversions of Series A Preferred Stock for the
years ended June 30, 1997 and 1996.

     Cash payments for interest were approximately $14,000,  $15,000 and $13,000
for the years ended June 30, 1998,  1997 and 1996,  respectively.  There were no
income tax payments made for the years ended June 30, 1998, 1997 and 1996.

     As part of the commission due to the real estate broker in connection  with
the  termination  of the Company's  lease at 40  Kingsbridge  Road,  the Company
issued  150,000  five-year  warrants to purchase the  Company's  Common Stock at
$2.50 per share during the year ended June 30, 1996.  Also, in  connection  with
the Company's private placements of Common Stock, Series B Convertible Preferred
Stock ("Series B Preferred  Shares" or "Series B Preferred  Stock") and Series C
Convertible  Preferred Stock ("Series C Preferred Shares" or "Series C Preferred
Stock"),  the  Company  issued an  aggregate  of 50,000  five-year  warrants  to
purchase  the  Company's  Common  Stock,  at $4.11 per share as a finder's  fee,
during the year ended June 30, 1996. These  transactions are non-cash  financing
activities.


                                      F-10
<PAGE>


                          ENZON, INC. AND SUBSIDIARIES
              Notes to Consolidated Financial Statements, Continued


     Upon  exhaustion  of the  Company's  current  cash  reserve  including  its
financing  in July 1998 (see note),  the  Company's  continued  operations  will
depend on its ability to realize  significant  revenues from the commercial sale
of its products,  raise  additional  funds through equity or debt financing,  or
obtain  significant  licensing,  technology  transfer or contract  research  and
development  fees.  There can be no assurance  that these sales,  financings  or
revenue generating activities will be successful.

Net Loss Per Common Share

     Basic and  diluted  loss per common  share is based on the net loss for the
relevant period,  adjusted for cumulative,  undeclared  Series A Preferred Stock
dividends of $216,000,  $218,000 and $218,000 for the years ended June 30, 1998,
1997 and 1996,  respectively,  divided by the weighted  average number of shares
issued and outstanding  during the period.  For purposes of the diluted loss per
share  calculation,  the exercise or conversion of all dilutive potential common
shares is not  included,  due to the net loss  recorded for the years ended June
30, 1998, 1997 and 1996. As of June 30, 1998, the Company had 6,788,000 dilutive
potential common shares outstanding that could potentially dilute future diluted
earnings per share calculations.

Reclassifications

     Certain  prior  year  balances  were  reclassified  to  conform to the 1998
presentation.

(3)  Commitments and Contingencies

     The Company has a long-term supply agreement for unmodified L-asparaginase,
one of the raw materials used in ONCASPAR  produced for the U.S.  market,  under
which the  Company  is  required  to  purchase  minimum  quantities  of this raw
material on an annual basis.  Under the  agreement,  the Company was required to
purchase $1,300,000 of raw material for the year ended December 31, 1997. During
the  fiscal  years  ended  June  30,  1997  and  1996,   the  Company   expensed
approximately $592,000 and $701,000,  respectively,  related to the satisfaction
of the minimum purchase  requirements for unmodified  L-asparaginase  under this
supply  contract.  During the year ended June 30, 1998, the parties amended this
agreement.  The amendment extended the term of the supply agreement and the time
for the  Company  to  fulfill  the  remaining  $1,300,000  of  minimum  purchase
commitments  until December 31, 1999. In  consideration  for the extension,  the
Company paid  $75,000,  and made an advance  payment for the  remaining  minimum
purchase  commitment  of  $1,300,000.  During the year ended June 30, 1998,  the
Company made purchases of approximately $621,000, which were applied against the
advance  payment.  The remaining  advance  payment is shown as a long term other
asset with the corresponding current portion included in other current assets in
the  accompanying  consolidated  balance sheet as of June 30, 1998. The supplier
will deliver the prepaid inventory at the Company's request through December 31,
1999.  Any inventory  that is not taken by the Company by December 31, 1999 will
be forfeited.  While it is possible that the Company may incur similar losses on
its remaining purchase commitments under this supply agreement, the Company does
not consider such losses  probable,  nor can the amount of any loss which may be
incurred  in the  future  presently  be  estimated  due to a number of  factors,
including, but not limited to, potential increased demand for ONCASPAR from RPR,
expansion into additional  markets outside the U.S. and the possibility that the
Company could renegotiate the level of required purchases.


                                      F-11
<PAGE>


                          ENZON, INC. AND SUBSIDIARIES
              Notes to Consolidated Financial Statements, Continued


     The Company has  agreements  with certain  members of its upper  management
that provide for payments following a termination of employment  occurring after
a change in control of the  Company.  The Company  also has a 3-year  employment
agreement, dated April 5, 1997, with President and Chief Executive Officer which
provides for severance  payments in addition to the change in control provisions
discussed above.

     The  Company  is being  sued by a former  financial  advisor,  LBC  Capital
Resources  Inc.  ("LBC"),  which is asserting  that under a May 2, 1995,  letter
agreement ("Letter  Agreement") between Enzon and LBC Capital Resources ("LBC"),
LBC was entitled to a commission  in connection  with the Company's  January and
March 1996  private  placements,  comprised of $500,000 and warrants to purchase
1,000,000  shares of Enzon common stock at an exercise price of $2.50 per share.
LBC has also asserted  that it is entitled to an additional  fee of $175,000 and
warrants to purchase 250,000 shares of Enzon common stock when and if any of the
warrants  obtained  pursuant to the private  placements are  exercised.  LBC has
claimed $3,000,000 in compensatory damages, plus punitive damages,  counsel fees
and costs for the alleged breach of the Letter  Agreement.  The Company believes
that no such  commission  was due under the  Letter  Agreement  and  denies  any
liability under the Letter Agreement. The Company intends to defend this lawsuit
vigorously.

     In the course of normal operations, the Company is subject to the marketing
and manufacturing regulations as established by the Food and Drug Administration
(FDA).  Recently,  the  Company's  quality  assurance  department  has  observed
increased  levels of  particulates  in  certain  batches  of  ONCASPAR  which it
manufactured.  These batches were not shipped and the Company's recent rejection
rate for the  manufacture  of this product is  significantly  higher than it has
been  historically.  The  Company  is  engaged  in an  extensive  review  of its
manufacturing  procedures  of this product and believes  that the problem may be
related to certain materials which are used in the filling process. Accordingly,
the Company has been in  discussions  with the FDA  regarding  this  problem and
expects  to have  further  discussions  with the FDA.  The  Company is unable to
predict  what,  if any,  impact  this  matter  will  have on  future  sales  and
manufacturing of ONCASPAR.

(4)  Inventories

     Inventories consist of the following:

                                                     June 30,
                                            --------------------------
                                             1998                 1997
                                             ----                 ----
     Raw materials                         $510,000             $269,000
     Work in process                        398,000              269,000
     Finished goods                         115,000              322,000
                                         ----------           ----------
                                         $1,023,000             $860,000
                                         ==========           ==========
             
(5)  Property and Equipment

     Property and equipment consist of the following:

                                             June 30,
                                   ----------------------------      Estimated
                                       1998             1997        useful lives
                                   -----------      -----------     ------------
     Equipment                      $8,647,000       $9,108,000      3-7 years
     Furniture and fixtures          1,501,000        1,530,000      7 years
     Vehicles                           29,000           29,000      3 years
     Leasehold improvements          4,957,000        5,010,000      3-15 years
                                   -----------      -----------
                                   $15,134,000      $15,677,000
                                   ===========      ===========

     Depreciation and amortization  charged to operations,  relating to property
and equipment, totaled $1,063,000, $1,499,000 and $1,891,000 for the years ended
June 30, 1998, 1997 and 1996, respectively.


                                      F-12
<PAGE>

                          ENZON, INC. AND SUBSIDIARIES
              Notes to Consolidated Financial Statements, Continued


(6)  Stockholders' Equity

     In July 1998, the Company sold 3,983,000  shares of Common Stock to a small
group of investors resulting in gross proceeds of approximately  $18,919,000 via
a private placement. Net proceeds of approximately  $17,600,000 were received by
the Company.

     In January  1996,  the Company  completed a private  placement of 1,094,890
shares of Common Stock and 40,000 Series B Preferred  Shares  resulting in gross
proceeds of $7,000,000. In March 1996, the Company completed a private placement
of 266,667 shares of Common Stock and 20,000 Series C Preferred Shares resulting
in gross proceeds of $3,000,000. The two private placements resulted in net cash
proceeds of  approximately  $9,444,000  after payment of related  expenses and a
finder's fee.

     In connection with the January 1996 and March 1996 private placements,  the
Company issued five-year  warrants to purchase 638,686 shares of Common Stock at
$4.11  per  share  and  200,000  shares  of  Common  Stock at $5.63  per  share,
respectively.  The  Company  paid a finder's  fee in cash and  issued  five-year
warrants to purchase 50,000 shares of Common Stock at $4.11 per share related to
the 1996 private placements.

     During the year  ended  June 30,  1997,  all of the  outstanding  shares of
Series B Preferred Stock were converted into Common Stock.  The 40,000 shares of
Series B  Preferred  Stock  which were  converted  resulted  in the  issuance of
2,038,989 shares of Common Stock.

     During  March 1997,  all of the  outstanding  Series C Preferred  Stock was
exchanged  for newly  issued  Series D Preferred  Stock.  The Series D Preferred
Stock  contained the same provisions as the Series C Preferred  Stock,  with the
exception of the  elimination  of a restriction  on the maximum number of shares
which could be held by the holding  institution.  During March 1997,  all of the
outstanding Series D Preferred Stock was converted into Common Stock. The 20,000
shares of Series D Preferred Stock which were converted resulted in the issuance
of 1,015,228 shares of Common Stock.

Series A Preferred Stock

     The Company's  Series A Preferred  Shares are convertible into Common Stock
at a  conversion  rate of $11 per  share.  The value of the  Series A  Preferred
Shares  for  conversion  purposes  is $25 per  share.  Holders  of the  Series A
Preferred  Shares are  entitled to an annual  dividend of $2 per share,  payable
semiannually,  but only when and if declared by the Board of  Directors,  out of
funds  legally  available.  Dividends  on the  Series  A  Preferred  Shares  are
cumulative and accrue and accumulate but will not be paid, except in liquidation
or upon  conversion,  until  such  time  as the  Board  of  Directors  deems  it
appropriate  in light of the  Company's  then current  financial  condition.  No
dividends are to be paid or set apart for payment on the Company's Common Stock,
nor are any shares of Common Stock to be redeemed, retired or otherwise acquired
for  valuable  consideration  unless  the  Company  has  paid  in  full  or made
appropriate  provision for the payment in full of all dividends  which have then
accumulated on the Series A Preferred Shares.  Holders of the Series A Preferred
Shares  are  entitled  to one vote per share on  matters to be voted upon by the
stockholders of the Company.  As of June 30, 1998 and 1997,  undeclared  accrued
dividends  in arrears  were  $1,770,000  or $16.54 per share and  $1,585,000  or
$14.54 per  share,  respectively.  All  Common  Shares are junior in rank to the
Series A Preferred  Shares,  with respect to the  preferences  as to  dividends,
distributions  and payments upon the  liquidation,  dissolution or winding up of
the Company.


                                      F-13
<PAGE>


                          ENZON, INC. AND SUBSIDIARIES
              Notes to Consolidated Financial Statements, Continued


     During the year ended June 30,  1998,  2,000  shares of Series A  Preferred
Shares were  converted to 4,544  shares of Common  Stock.  Accrued  dividends of
$31,000 were settled by issuing  2,848 shares of Common Stock and cash  payments
totaling  $28 for  fractional  shares.  There  were no  conversions  of Series A
Preferred Shares during the years ended June 30, 1997 or 1996.

Common Stock

     Holders  of shares of Common  Stock are  entitled  to one vote per share on
matters to be voted upon by the stockholders of the Company.

     As of June 30, 1998, the Company has reserved its common shares for special
purposes as detailed below:

Shares issuable upon conversion of
      Series A Preferred Shares                                          404,000
Shares issuable upon exercise of outstanding warrants                  1,039,000
Shares issuable for private placement                                  3,983,000
Non-Qualified Stock Option Plan                                        5,345,000
                                                                      ----------
                                                                      10,771,000
                                                                      ==========

Common Stock Warrants

     During the year ended June 30, 1996, as part of the  commission  due to the
real estate broker in connection  with the  termination of the Company's  former
lease at 40 Kingsbridge Road, the Company issued 150,000  five-year  warrants to
purchase the Company's Common Stock at $2.50 per share.

Series B and C Preferred Stock Warrants

     As of June 30, 1998 and 1997, warrants to purchase 688,686 shares of common
stock at $4.11 and 200,000 shares of common stock at $5.63, issued in connection
with the private  placements of Series B and C Preferred  Shares,  respectively,
were outstanding.

(7)  Independent Directors' Stock Plan

     On  December  3, 1996,  the  stockholders  voted to approve  the  Company's
Independent  Directors'  Stock Plan, which provides for compensation in the form
of quarterly  grants of Common  Stock to  independent  directors  serving on the
Company's  Board of Directors.  Each  independent  director is granted shares of
Common Stock  equivalent  to $2,500 per quarter plus $500 per Board of Directors
meeting attended.  The number of shares issued is based on the fair market value
of Common Stock on the last trading day of the  applicable  quarter.  During the
years ended June 30, 1998 and 1997,  the Company issued 16,904 and 25,903 shares
of Common  Stock,  respectively,  to  non-executive  directors,  pursuant to the
Independent Directors' Stock Plan.



                                      F-14
<PAGE>


                          ENZON, INC. AND SUBSIDIARIES
              Notes to Consolidated Financial Statements, Continued


(8)  Non-Qualified Stock Option Plan

     In November 1987, the Company's Board of Directors  adopted a Non-Qualified
Stock Option Plan (the "Stock  Option  Plan").  As of June 30,  1998,  5,345,000
shares of Common Stock were reserved for issuance  pursuant to options which may
be granted to employees,  non-employee  directors or consultants to the Company.
The  exercise  price of the  options  granted  must be at least 100% of the fair
market  value of the stock at the time the  option is  granted.  Options  may be
exercised  for a period of up to ten years from the date they are  granted.  The
other terms and conditions of the options  generally are to be determined by the
Board of Directors,  or an option committee appointed by the Board of Directors,
at their discretion.

     The Company has adopted the  disclosure-only  provisions  of  Statement  of
Financial  Accounting  Standards  No.  123  ("SFAS No.  123"),  "Accounting  for
Stock-Based Compensation".  The Company continues to use APB No. 25, "Accounting
for Stock  Issued to  Employees,"  to account  for the Stock  Option  Plan.  All
options  granted  under the Stock Option Plan are granted with  exercise  prices
which equal or exceed the fair  market  value of the stock at the date of grant,
accordingly,  there is no compensation expense recognized for options granted to
employees.  The Company records compensation expense equal to the value of stock
options   granted   for   consulting   services   rendered  to  the  Company  by
non-employees.  The value of the options granted to  non-employees is determined
using the Black-Scholes option-pricing model.

     The  following  pro forma  financial  information  shows the effect and the
Company's net loss and loss per share, had compensation  expense been recognized
consistent with the fair value method prescribed by SFAS No. 123.

<TABLE>
<CAPTION>
                                          1998             1997              1996
                                     -------------    -------------    -------------
<S>                                    <C>              <C>              <C>         
     Net loss - as reported            ($3,617,000)     ($4,557,000)     ($5,175,000)
     Net loss - pro forma              ($5,638,000)     ($5,927,000)     ($5,645,000)
     Loss per share - as reported           ($0.12)          ($0.16)          ($0.20)
     Loss per share - pro forma             ($0.19)          ($0.21)          ($0.22)
</TABLE>

     The pro forma  effect  on the loss for each of the years in the  three-year
period ended June 30, 1998 is not necessarily indicative of the pro forma effect
on  earnings  in future  years  since it does not take into effect the pro forma
compensation  expense  related  to grants  made prior to the year ended June 30,
1996.  The fair value of each option  granted  during the three years ended June
30,  1998  is   estimated   on  the  date  of  grant  using  the   Black-Scholes
option-pricing model with the following  assumptions:  (i) dividend yield of 0%,
(ii) expected term of five years, (iii) expected volatility of 84%, 82% and 78%,
and (iv) a risk-free interest rate of 5.57%, 6.45% and 6.09% for the years ended
June 30, 1998, 1997, and 1996, respectively.  The weighted average fair value at
the date of grant for options granted during the years ended June 30, 1998, 1997
and 1996 was $5.85, $2.78 and $3.51 per share, respectively.



                                      F-15
<PAGE>


                          ENZON, INC. AND SUBSIDIARIES
              Notes to Consolidated Financial Statements, Continued


     The  following is a summary of the activity in the  Company's  Stock Option
Plan:

<TABLE>
<CAPTION>
                                                                Weighted
                                                                Average
                                                                Exercise     Range of
                                                  Shares         Price         Prices
                                                  ------         -----         ------
<S>                                              <C>              <C>      <C>            
Outstanding at July 1, 1995                      3,603,000       $4.95     $1.88 to $14.88
Granted at exercise prices which exceeded the
  fair market value on the date of grant             4,000        3.38     $3.38
Granted at exercise prices which equaled the
   fair market value on the date of grant          763,000        3.51     $2.38 to $4.75
Exercised                                          (16,000)       2.54     $2.09 to $2.81
Cancelled                                         (796,000)       4.50     $2.09 to $11.00
                                                 ---------
Outstanding at June 30, 1996                     3,558,000        4.75     $1.88 to $14.88

Granted at exercise prices which exceeded the
  fair market value on the date of grant             3,000        2.81     $2.81
Granted at exercise prices which equaled the
 fair market value on the date of grant          1,469,000        2.78     $2.31 to $3.41
Exercised                                          (11,000)       2.37     $2.00 to $2.63
Cancelled                                         (822,000)       6.26     $2.00 to $14.25
                                                 ---------
Outstanding at June 30, 1997                     4,197,000        3.77     $1.88 to $14.88

 Granted at exercise prices which equaled the
  fair market value on the date of grant           719,000        5.85     $2.03 to $6.56
 Exercised                                        (305,000)       2.73     $2.06 to $5.13
 Cancelled                                        (189,000)       6.69     $2.09 to $14.88
                                                 ---------
 Outstanding at June 30, 1998                    4,422,000        4.06     $1.88 to $10.88
                                                 =========
</TABLE>

     As of June 30,  1998,  the Stock  Option Plan had options  outstanding  and
exercisable by price range as follows:

<TABLE>
<CAPTION>
                                    Weighted
                                     Average      Weighted                    Weighted
    Range of                        Remaining     Average                      Average
    Exercise            Options    Contractual    Exercise     Options        Exercise
     Prices           Outstanding     Life         Price      Exercisable      Price  
     ------           -----------     ----         -----      -----------      -----  
<S>                     <C>           <C>          <C>         <C>             <C>  
 $1.88  to  $2.56       570,000       7.46         $2.26       461,000         $2.19
 $2.63  to  $2.75       663,000       7.34         $2.68       563,000         $2.68
 $2.81  to  $2.94       845,000       8.13         $2.86       389,000         $2.85
 $2.95  to  $4.00       556,000       6.91         $3.51       535,000         $3.51
 $4.06  to  $5.38       675,000       5.83         $4.73       672,000         $4.73
 $5.44  to  $6.00       643,000       8.88         $5.88        31,000         $5.85
 $6.13  to $10.88       470,000       2.48         $7.50       404,000         $7.70
                      ---------                              ---------       
 $1.88  to $10.88     4,422,000       6.93         $4.06     3,055,000         $3.92
                      =========                              =========    
</TABLE>


                                      F-16
<PAGE>

                          ENZON, INC. AND SUBSIDIARIES
              Notes to Consolidated Financial Statements, Continued


(10) Income Taxes

The Company  accounts for income taxes in accordance with Statement of Financial
Accounting  Standards  No. 109 (SFAS No. 109),  "Accounting  for Income  Taxes".
Under the asset and  liability  method of SFAS No. 109,  deferred tax assets and
liabilities   are   recognized  for  the  estimated   future  tax   consequences
attributable to differences  between  financial  statement  carrying  amounts of
existing  assets and liabilities  and their  respective tax bases.  Deferred tax
assets and liabilities are measured using enacted tax rates expected to apply to
taxable income in the years in which those temporary differences are expected to
be recovered  or settled.  Under SFAS No. 109, the effect on deferred tax assets
and  liabilities  of a change in tax rates is recognized in income in the period
that includes the enactment date.

     At June 30, 1998 and 1997,  the tax effects of temporary  differences  that
give rise to the  deferred  tax  assets  and  deferred  tax  liabilities  are as
follows:

<TABLE>
<CAPTION>
                                                                              1998            1997
                                                                          ------------    ------------
<S>                                                                         <C>             <C>       
Deferred tax assets:
   Inventories                                                                $111,000         $50,000
   Investment valuation reserve                                                 86,000          86,000
   Contribution carryover                                                       19,000          17,000
   Compensated absences                                                        115,000         111,000
   Excess of financial statement over tax depreciation                         827,000         627,000
   Royalty advance - RPR                                                       402,000         842,000
   Non-deductible expenses                                                     543,000         301,000
   Federal and state net operating loss carryforwards                       42,133,000      40,385,000
   Research and development and investment tax credit carryforwards          7,447,000       6,912,000
                                                                          ------------    ------------

       Total gross deferred tax assets                                      51,683,000      49,331,000
                                                
       Less valuation allowance                                            (50,977,000)    (48,625,000)
                                                                          ------------    ------------
                                                
       Net deferred tax assets                                                 706,000         706,000
                                                                          ------------    ------------
                                                
Deferred tax liabilities:               
   Step up in basis of assets related to acquisition of Enzon Labs Inc.       (706,000)       (706,000)
                                                                          ------------    ------------

       Total gross deferred tax liabilities                                   (706,000)       (706,000)
                                                                          ------------    ------------
       Net deferred tax                                                             $0              $0
                                                                          ============    ============
</TABLE>

     A valuation allowance is provided when it is more likely than not that some
portion or all of the deferred  tax assets will not be realized.  The net change
in the total valuation  allowance for the years ended June 30, 1998 and 1997 was
an increase of $2,221,000 and $2,218,000,  respectively. The tax benefit assumed
using  the  Federal  statutory  tax rate of 34% has been  reduced  to an  actual
benefit  of zero due  principally  to the  aforementioned  valuation  allowance.
Subsequently  recognized tax benefits as of June 30, 1998 of $1,071,000 relating
to the  valuation  allowance  for  deferred  tax  assets  will be  allocated  to
additional paid-in capital.


                                      F-17
<PAGE>

                          ENZON, INC. AND SUBSIDIARIES
              Notes to Consolidated Financial Statements, Continued


     At June 30, 1998, the Company had federal net operating loss  carryforwards
of approximately  $107,313,000 for tax reporting  purposes,  which expire in the
years 1998 to 2013. The Company also has investment tax credit  carryforwards of
approximately  $10,000 and research and development tax credit  carryforwards of
approximately  $6,292,000  for tax reporting  purposes which expire in the years
1998 to 2013.

     As part of the  Company's  acquisition  of Enzon  Labs  Inc.,  the  Company
acquired the net operating loss  carryforwards of Enzon Labs Inc. As of June 30,
1998,  the Company had a total of  $61,493,000  acquired  Enzon Labs,  Inc.  net
operating loss carryforwards, which expire between December 31, 1998 and October
31,  2006.  As a result of the change in  ownership,  the  utilization  of these
carryforwards is limited to $613,000 per year. If utilized,  the benefit will be
recorded as a reduction in the carrying value of patents, net.

(11) Significant Agreements

     Schering Agreement

     The  Company  and  Schering  Corporation  ("Schering"),   a  subsidiary  of
Schering-Plough  Corporation,  entered into an  agreement in November  1990 (the
"Schering  Agreement")  to apply the Company's PEG Process to develop a modified
form of Schering's  INTRON(R) A (interferon  alfa 2b), a  genetically-engineered
anticancer and antiviral drug with longer lasting activity.

     Under  the  license  agreement,  which was  amended  in 1995,  the  Company
transferred  proprietary  manufacturing  rights for PEG-Intron A to Schering for
$3,000,000,  of which  $2,000,000  was paid on June 30, 1995 and  $1,000,000 was
paid during the year ended June 30, 1997. In connection with the amendment,  the
Company  also sold to Schering  847,000  shares of  unregistered,  newly  issued
Common  Stock for  $2,000,000  in gross  proceeds.  Under the  current  Schering
Agreement,  Enzon retained an option to become Schering's exclusive manufacturer
of PEG-Intron A for the United States market upon FDA approval of such product.

     Under the  Schering  Agreement,  Enzon is  entitled  to receive  sequential
payments,  totaling  approximately  $5,500,000,  subject to the  achievement  of
certain milestones in the product's  development  program, of which two payments
totaling  $2,500,000 were received in August 1997 related to the commencement of
a Phase III clinical trial. The Company will also receive royalties on worldwide
sales of PEG-Intron A, if any.  Schering will be responsible  for conducting and
funding the clinical studies,  obtaining  regulatory  approval and marketing the
product worldwide on an exclusive basis.

     The Schering Agreement terminates,  on a country-by-country basis, upon the
final  expiration of any future patents covering the product which may be issued
to Enzon,  or 15 years  after the  product  is  approved  for  commercial  sale,
whichever  shall be the later to occur.  This agreement is subject to Schering's
right of early  termination if the product does not meet  specifications,  or if
Enzon fails to obtain or maintain the requisite product liability insurance,  or
if  Schering  makes  certain  payments  to Enzon.  If  Schering  terminates  the
agreement  because  the  product  does not  meet  specifications,  Enzon  may be
required to refund certain of the milestone payments.


                                      F-18
<PAGE>


                          ENZON, INC. AND SUBSIDIARIES
              Notes to Consolidated Financial Statements, Continued


Rhone-Poulenc Rorer Agreement

     The Company has granted RPR an exclusive  license ("the Amended RPR License
Agreement") in the United States to sell ONCASPAR and any other PEG-asparaginase
product (the "Product") developed by Enzon or RPR during the term of the License
Agreement.  Under this agreement,  Enzon received  licensing  payments  totaling
$6,000,000 and was entitled to a base royalty of 10% for the year ended December
31, 1995 and will earn 23.5% thereafter, until 2008, on net sales of ONCASPAR up
to agreed upon amounts. Additionally, the Amended RPR License Agreement provides
for a super  royalty of 23.5% for the year  ended  December  31,  1995 and 43.5%
thereafter,  until 2008 on net sales of  ONCASPAR  which  exceed the agreed upon
amounts,  with the limitation that the total royalties  earned for any such year
shall not  exceed 33% of net sales.  The  Amended  RPR  License  Agreement  also
provides for a payment of $3,500,000 in advance royalties, which was received in
January 1995.

     Base  royalties due under the amended  agreement  will be offset  against a
credit of $5,970,000 (which represents the royalty advance plus reimbursement of
certain  amounts due to RPR under the previous  agreement and interest  expense)
before cash payments for base  royalties will be made.  Super  royalties will be
paid to the Company  when  earned.  The royalty  advance is shown as a long term
liability,  with the corresponding  current portion included in accrued expenses
on the  Consolidated  Balance  Sheets as of June 30, 1998 and 1997.  The royalty
advance will be reduced as base royalties are recognized under the agreement.

     The Amended RPR License  Agreement  prohibits  RPR from selling a competing
PEG-asparaginase  product  anywhere in the world  during the term of the License
Agreement and for five years  thereafter.  The Agreement  terminates in December
2008, subject to early termination by either party due to a default by the other
or by RPR at any time on one year's prior notice to Enzon. Upon any termination,
all rights under the License Agreement revert to Enzon.

     The Company has also  granted RPR  exclusive  licenses to sell  ONCASPAR in
Canada and Mexico. These agreements provide for RPR to obtain marketing approval
of  ONCASPAR in Canada and Mexico and for the  Company to receive  royalties  on
sales of ONCASPAR in these  countries,  if any. A separate supply agreement with
RPR  requires  RPR to  purchase  from  Enzon all of RPR's  requirements  for the
Product for sales in North America.

     During May 1998, the Company entered into an additional  license  agreement
with RPR for the Pacific  Rim  region,  specifically,  Australia,  New  Zealand,
Japan,  Hong Kong,  Korea,  China,  Taiwan,  Philippines,  Indonesia,  Malaysia,
Singapore,  Thailand and Viet Nam, (the "Pacific Rim").  The agreement  provides
for RPR to  purchase  ONCASPAR  for the  Pacific Rim from the Company at certain
established prices which increase over the ten year term of the agreement. Under
the  agreement,  RPR is  responsible  for  obtaining  additional  approvals  and
indications in the licensed territories. The agreement also provides for minimum
purchase requirements for the first four years of the agreement.


                                      F-19
<PAGE>


                          ENZON, INC. AND SUBSIDIARIES
              Notes to Consolidated Financial Statements, Continued


MEDAC Agreement

     During  October  1996,  the  Company  entered  into  an  exclusive  license
agreement with Medac GmbH  ("MEDAC") to sell ONCASPAR in Europe and Russia.  The
agreement  provides for MEDAC to purchase  ONCASPAR  from the Company at certain
established  prices  which  increase  over the  initial  term of the  five  year
agreement.  Under the agreement,  MEDAC is responsible for obtaining  additional
approvals  and  indications  in the licensed  territories,  beyond the currently
approved hypersensitive  indication,  in Germany. Under the agreement,  MEDAC is
required to meet certain minimum purchase requirements.

(12) Leases

     The Company  has  several  leases for  office,  warehouse,  production  and
research   facilities   and   equipment.   Future  minimum  lease  payments  for
noncancellable  operating leases with initial or remaining lease terms in excess
of one year as of June 30, 1998 are as follows:

         Year ending                                          Operating
           June 30,                                             leases  
         -----------                                           ---------
         1999                                                  1,505,000
         2000                                                    979,000
         2001                                                    952,000
         2002                                                    819,000
         2003                                                    765,000
         Later years, through 2007                             2,935,000
                                                              ----------
         Total minimum lease payments                         $7,955,000
                                                              ==========

     Rent expense  amounted to  $1,768,000,  $1,608,000  and  $1,469,000 for the
years ended June 30, 1998, 1997 and 1996, respectively.

     The Company currently subleases a portion of its facilities.  For the years
ended June 30, 1998,  1997 and 1996,  rent expense is net of sublease  income of
$221,000, $233,000 and $249,000, respectively.

(13) Retirement Plans

     The  Company  maintains a defined  contribution,  401(k)  pension  plan for
substantially  all its  employees.  The  Company  currently  matches  50% of the
employee's contribution of up to 6% of compensation, as defined. Prior to August
9, 1996, the Company's match was 25% of the employee's  contribution of up to 6%
of compensation,  as defined.  Effective January 1, 1995, the Company's match is
invested solely in a fund which purchases the Company's Common Stock in the open
market. Total company  contributions for the years ended June 30, 1998, 1997 and
1996 were $100,000, $105,000 and $63,000, respectively.


                                      F-20
<PAGE>


                          ENZON, INC. AND SUBSIDIARIES
              Notes to Consolidated Financial Statements, Continued


(14) Accrued Expenses

                        Accrued expenses consist of:
                                                               June 30,         
                                                       ------------------------ 
                                                       1998               1997
                                                       ----               ----

Accrued wages and vacation                           $695,000           $484,000
Accrued Medicaid rebates                            1,083,000            989,000
Current portion of royalty
 advance - RPR                                      1,006,000            930,000
Accrual for commitments                                    --            340,000
Other                                               1,592,000            762,000
                                                   ----------         ----------
                                                   $4,376,000         $3,505,000
                                                   ==========         ==========

(15) Sales Information

     During the years ended June 30, 1998, 1997 and 1996, the Company had export
sales of $2,641,000,  $2,377,000  and  $2,105,000,  of these  amounts,  sales to
Europe represented $2,117,000, $1,937,000 and $1,858,000, respectively.

     ADAGEN sales represent  approximately  82% of the Company's total net sales
for the year ended June 30, 1998.  ADAGEN's  Orphan Drug  designation  under the
Orphan Drug Act expired in March 1997.  The Company  believes the  expiration of
ADAGEN's Orphan Drug designation will not have a material impact on the sales of
ADAGEN.  Approximately  48%, 54% and 46% of the  Company's  ADAGEN sales for the
years ended June 30, 1998,  1997 and 1996,  respectively,  were made to Medicaid
patients.

(16) Other Income

     During the year ended June 30, 1996, the Company recognized as other income
approximately  $1,313,000 representing the unused portion of an advance received
under a development and license agreement with Sanofi Winthrop, Inc. ("Sanofi").
Under the agreement with Sanofi,  Enzon transferred all  responsibility  for the
development  and  regulatory  approval in the United  States for  PEG-superoxide
dismutase ("PEG-SOD") in return for 40% of the net profits from sales of PEG-SOD
in the United  States.  During  October  1995,  the Company  learned that Sanofi
intended to cease  development  of PEG-SOD  (Dismutec(TM))  due to the product's
failure to show a  statistically  significant  difference  between the treatment
group and the control  group in a pivotal  Phase III trial.  Due in part to this
product failure,  the Company believes it has no further  obligations  under its
agreement with Sanofi with respect to the $1,313,000 advance and therefore,  the
Company has recognized as other income the amount due Sanofi previously recorded
as a current liability.


                                      F-21
<PAGE>


                                  EXHIBIT INDEX


Exhibit                                                                    Page
Numbers         Description                                               Number

 10.28          Placement Agent Agreement dated June 25, 1998                 E1
  21.0          Subsidiaries of Registrant                                   E22
  23.0          Consent of KPMG Peat Marwick LLP                             E23
  27.0          Financial Data Schedule                                      E24
  99.0          Additional Exhibits                                          E25




                                       E-1



                                   ENZON, INC.

                                4,000,000 Shares

                          Common Stock, $0.01 Par Value

                            PLACEMENT AGENT AGREEMENT


                                  June 25, 1998


SBC Warburg Dillon Read Inc.
535 Madison Avenue
New York, New York  10022

Ladies and Gentlemen:

     The  undersigned,  Enzon,  Inc., a Delaware  corporation  (the  "Company"),
hereby confirms its agreements with SBC Warburg Dillon Read Inc. (the "Placement
Agent") as follows:

     1.  Description  of the Shares.  The Company has  authorized by appropriate
corporate  action  and  proposes  to sell  in the  manner  contemplated  by this
Placement  Agent  Agreement  (the  "Agreement")  up  to  4,000,000  shares  (the
"Shares") of its Common Stock, $0.01 par value (the "Common Stock").

     2.  Closing.  The  closing  of the  purchase  and sale of the Shares to the
Purchasers  (as such  term is  defined  in the  form of  Common  Stock  Purchase
Agreement  attached  as Appendix A to the  Offering  Memorandum  (the  "Purchase
Agreement")),  pursuant to the Purchase  Agreement (the "Closing") shall be held
at the offices of Dorsey & Whitney  LLP,  250 Park  Avenue,  New York,  New York
10177 at or before 10:00 a.m.,  New York time,  on the date that is two business
days after the date on which the Registration Statement on Form S-3 contemplated
by the Purchase Agreement  (including all amendments thereto,  the "Registration
Statement") is declared effective or at such other time and place as the Company
and the Placement  Agent may agree (the  "Closing  Date").  At the Closing,  the
Purchasers  shall  deliver to the  Placement  Agent wire  transfers in the gross
amount due to the Company for the Shares being  purchased by each  Purchaser and
the  Placement  Agent shall  deliver to the  Company a wire  transfer in the net
amount due to the Company (after deducting the Placement Agent Fee (as


<PAGE>


defined in Section  4(b) for such  Shares to the extent (and only to the extent)
that payments have been  delivered to the Placement  Agent by the Purchasers for
such Shares (it being understood that the Company will not be obligated to issue
any  Shares  for which full  payment  of the gross  purchase  price has not been
received).

     3.  Representations  and Warranties of the Company.  The Company represents
and warrants to and agrees with the Placement Agent that:

          (a) The  Private  Placement  Offering  Memorandum  dated  June 4, 1998
     (including  appendices  thereto,   information  incorporated  by  reference
     therein and the  financial  statements of the Company and the related notes
     thereto  included  therein),  as  amended  and  supplemented  prior  to the
     execution  hereof,  and all amendments and supplements  thereto  (including
     appendices thereto,  information  incorporated by reference therein and the
     financial  statements of the Company and the related notes thereto included
     therein)  delivered to the Purchasers  prior to the Closing  (collectively,
     the "Offering  Memorandum") at the date hereof does not, and at the Closing
     will not,  contain any untrue statement of a material fact or omit to state
     a material  fact  required to be stated  therein or  necessary  to make any
     statements  therein, in the light of the circumstances under which they are
     made, not misleading;  provided,  however, that none of the representations
     and warranties  contained in this  subparagraph  shall apply to information
     that relates to the plan of  distribution or to the Placement Agent that is
     included in the Offering  Memorandum  in reliance  upon,  and in conformity
     with, written  information  furnished to the Company by the Placement Agent
     specifically for inclusion therein.

          (b) The Company has filed all the  documents  (collectively,  the "SEC
     Documents")  that the Company was required to file with the  Securities and
     Exchange Commission (the "Commission") under Section 13, 14 or 15(d) of the
     Securities and Exchange Act of 1934, as amended (the "Exchange  Act") since
     the effective date of the registration  statement filed with respect to its
     initial public offering.  The SEC Documents,  when they were filed with the
     Commission,  conformed in all material  respects to the requirements of the
     Securities  Act of 1933,  as amended  (the "Act") or the  Exchange  Act, as
     applicable,  and the rules,  regulations and instructions of the Commission
     thereunder,  and any  documents  so filed and included or  incorporated  by
     reference  in  the  Offering  Memorandum  or  the  Registration   Statement
     subsequent  to  the  date  hereof  will,  when  they  are  filed  with  the
     Commission,  conform in all material  respects to the  requirements  of the
     Exchange Act and the rules,  regulations and instructions of the Commission
     thereunder;  and when such documents were or are filed with the Commission,
     none of such documents  included or will include any untrue  statement of a
     material  fact or omitted or will omit to state any material  fact required
     to be stated  therein or necessary to make the statements  therein,  in the
     light of the circumstances under which they were made, not misleading.

          (c) The Company has been duly  incorporated and is validly existing as
     a  corporation  in good  standing  under  the laws of its  jurisdiction  of
     incorporation  with full power and authority  (corporate and other) to own,
     lease and operate its properties and conduct its


                                       2
<PAGE>


     business as described in the  Offering  Memorandum;  except as described in
     Schedule  3(c)  hereto,  the Company  does not own or control,  directly or
     indirectly any  corporation,  association  or other entity;  the Company is
     duly  qualified  to do  business  as a foreign  corporation  and is in good
     standing  in each  jurisdiction  in  which  the  ownership  or  leasing  of
     properties  or the conduct of its  business  requires  such  qualification,
     except  where the  failure  to be so  qualified  would not have a  material
     adverse  effect  on  the  condition  (financial  or  otherwise),  earnings,
     operations,  business  or business  prospects  of the  Company;  except for
     product   marketing   approvals   by  the  United   States  Food  and  Drug
     Administration and comparable foreign regulatory  agencies described in the
     Offering Memorandum required for the conduct of its business as proposed to
     be conducted in the future,  the Company is in  possession of and operating
     in compliance with all authorizations,  licenses,  certificates,  consents,
     orders and permits  from state,  federal and other  regulatory  authorities
     which are applicable to the conduct of its business as presently  conducted
     and proposed to be conducted,  all of which are valid and in full force and
     effect, except where the failure to so possess or so operate would not have
     a  material  adverse  effect on the  condition  (financial  or  otherwise),
     earnings,  operations,  business or business prospects of the Company;  the
     Company  is not in  violation  of its  respective  charter  or bylaws or in
     breach or default (nor has any event occurred  which with notice,  lapse of
     time, or both,  would constitute a breach or default) in the performance or
     observance  of any material  obligation,  agreement,  covenant or condition
     contained  in any  material  bond,  debenture,  note or other  evidence  of
     indebtedness  or  in  any  material  contract,  indenture,  mortgage,  loan
     agreement,  joint  venture or other  agreement or  instrument  to which the
     Company is a party or by which it or any of its  properties may be bound or
     in material violation of any law, order, rule, regulation, writ, injunction
     or decree of any government,  government instrumentality or court, domestic
     or foreign,  of which it has  knowledge,  except for violations or defaults
     which are not material to the Company.

          (d) The Company has full legal  right,  power and  authority  to enter
     into this  Agreement  with the  Placement  Agent and to enter into a Common
     Stock Purchase Agreement,  a form of which is attached as Appendix A to the
     Offering  Memorandum,  with each purchaser (a  "Purchaser")  of Shares (the
     "Purchase Agreement"),  and to perform the transactions contemplated hereby
     and  thereby.  This  Agreement  and the Purchase  Agreement  have been duly
     authorized,  executed and delivered by the Company,  and this Agreement and
     the Purchase Agreement,  upon their execution,  delivery and performance by
     the Company (assuming due execution,  delivery and performance by the other
     parties thereto),  will be valid and binding  agreements on the part of the
     Company,  enforceable in accordance  with their terms,  except as rights to
     indemnity  and  contribution  hereunder  and  thereunder  may be limited by
     applicable  law and except as the  enforcement  hereof and  thereof  may be
     limited by applicable bankruptcy, insolvency, reorganization, moratorium or
     other similar laws affecting  creditors'  rights  generally,  or by general
     equitable  principles;  the  performance of this Agreement and the Purchase
     Agreement  and the  consummation  of the  transactions  herein and  therein
     contemplated  will not result in a breach or  violation of any of the terms
     and  provisions  of, or  constitute  a default  under,  (i) any  indenture,
     mortgage, deed of trust, loan agreement, bond, debenture, note agreement or
     other evidence of  indebtedness,  or any material lease,  contract or other
     agreement


                                       3
<PAGE>


     or  instrument  to which the Company is a party or by which the property of
     the  Company is bound,  or (ii) the  charter or bylaws of the  Company,  or
     (iii) any law,  order,  rule,  regulation,  writ,  injunction,  judgment or
     decree of any court or governmental agency or body having jurisdiction over
     the  Company  or  over  the  properties  of the  Company;  and no  consent,
     approval,  authorization  or order of any court or  governmental  agency or
     body is required for the  consummation  by the Company of the  transactions
     herein  contemplated,  except  such as may be required  under the Act,  the
     Exchange Act or under state or other securities or Blue Sky laws.

          (e) There is not any  pending  or, to the  knowledge  of the  Company,
     threatened any action, suit, claim or proceeding against the Company or any
     of its  respective  officers or any of their  properties,  assets or rights
     before  any court or  governmental  agency or body or  otherwise  which (i)
     might result in any material adverse change in the condition  (financial or
     otherwise),  earnings,  operations,  business or business  prospects of the
     Company or might materially and adversely affect its properties,  assets or
     rights or (ii) might prevent consummation of the transactions  contemplated
     hereby which have not been accurately described in all material respects in
     the Offering Memorandum.

          (f) All  outstanding  shares of capital stock of the Company have been
     duly  authorized and validly  issued and are fully paid and  nonassessable,
     have been issued in compliance with all federal and state  securities laws,
     were not issued in  violation  of or subject  to any  preemptive  rights or
     other rights to subscribe for or purchase  securities,  and the  authorized
     and outstanding capital stock of the Company conforms,  as of the dates for
     which such information is given, in all material respects to the statements
     relating thereto contained in Exhibit G to the Purchase Agreement; there is
     no capital  stock  outstanding  as of such dates other than as described in
     Exhibit G to the Purchase Agreement;  and all issued and outstanding shares
     of capital  stock of the  Company  have been duly  authorized  and  validly
     issued and are fully paid and nonassessable.

          (g) Except as disclosed in or contemplated by the Offering Memorandum,
     the  Company  does not have  outstanding  any options to  purchase,  or any
     preemptive  rights or other  rights to subscribe  for or to  purchase,  any
     securities or obligations convertible into, or any contracts or commitments
     to issue or sell, shares of its capital stock or any such options,  rights,
     convertible securities or obligations. No stockholder of the Company, other
     than the  Purchasers,  has any right  (which has not been waived or has not
     expired by reason of lapse of time following  notification of the Company's
     intent to file the  Registration  Statement)  to  require  the  Company  to
     register the sale of any shares owned by such stockholder  under the Act in
     the Registration  Statement,  except  stockholders of the Company with such
     rights that are  eligible to sell all of such  securities  pursuant to Rule
     144(k) promulgated under the Act.

          (h) The  Shares  have been  duly  authorized,  and,  when  issued  and
     delivered  pursuant to the Purchase  Agreement,  will have been duly issued
     and delivered;  and the Shares will conform to the  description  thereof in
     Exhibit G to the Purchase Agreement in all material respects.


                                       4
<PAGE>


          (i) Except as disclosed in the Offering  Memorandum,  the Company owns
     or possesses sufficient rights to use all existing patents,  patent rights,
     inventions, trade secrets, know-how,  proprietary rights and processes that
     are  necessary  for the conduct  and  proposed  conduct of its  business as
     described in the Offering Memorandum (the "Company's  Proprietary  Rights")
     without any  conflict  with or  infringement  of the rights of others which
     would result in a material  adverse  effect on the condition  (financial or
     otherwise),  earnings,  operations,  business or business  prospects of the
     Company.  The Company  believes that there are no third parties who have or
     will  be able  to  establish  rights  to any of the  Company's  Proprietary
     Rights, except for (i) the ownership rights of the third party licensors to
     the Company's  Proprietary Rights which are licensed to the Company by such
     third party  licensors and (ii) the third party  licensees of the Company's
     Proprietary Rights. Except as disclosed in the Offering Memorandum,  to the
     knowledge of the Company,  there is no infringement by any third parties of
     any of  the  Company's  Proprietary  Rights.  Except  as  disclosed  in the
     Offering Memorandum, the Company has not received any notice of, and has no
     knowledge of any basis for, any  infringement  of or conflict with asserted
     rights of others with respect to any patent, patent right, invention, trade
     secret,  know-how or other proprietary rights that,  individually or in the
     aggregate, would have a material adverse effect on the condition (financial
     or otherwise),  earnings, operations, business or business prospects of the
     Company.

          (j) While there can be no  assurance  that FDA approval for any of the
     Company's  products  will be obtained  on a timely  basis,  or at all,  the
     Company  has  received no  communication  from the FDA  expressing  adverse
     comments, questions or concerns with regard to (i) any New Drug Application
     filed by the  Company  or (ii)  any  current  or  pending  clinical  trials
     relating to any of the Company's products,  other than comments,  questions
     or concerns to which the Company reasonably  believes it has responded,  or
     can respond,  to the satisfaction of the FDA without  unreasonable delay or
     expense and without  materially  impairing the  commercial  feasibility  of
     introducing  the  product in  question.  The  Company  has  applied for and
     obtained  from  the FDA an  Investigational  New  Drug  exemption  for each
     product with respect to which it has commenced human clinical  trials,  and
     all such  human  clinical  trials are being  conducted,  to the best of the
     Company's  knowledge,  in  compliance  in all  material  respects  with the
     protocols  submitted by the Company to the FDA and any conditions  relating
     thereto  imposed by the FDA.  The Company  has  received no notice from the
     FDA, and has no reason to believe,  that its  manufacturing  facilities  or
     processes are not in compliance  with current good  manufacturing  practice
     requirements.

          (k)  KPMG  Peat  Marwick  LLP,   which  has  examined  the   financial
     statements,  together with the related  schedules and notes, of the Company
     as of June  30,  1995,  1996 and 1997 and for the  years  then  ended,  are
     independent  accountants  within  the  meaning of the Act and the rules and
     regulations promulgated by the Commission thereunder; the audited financial
     statements of the Company,  together with the related  schedules and notes,
     and the  unaudited  financial  information  forming  part  of the  Offering
     Memorandum  fairly  present  the  financial  position  and the  results  of
     operations of the Company at the  respective  dates and for the  respective
     periods to which they apply; and all audited financial statements, together
     with the


                                       5
<PAGE>


     related schedules and notes, and the unaudited financial information,  have
     been prepared in accordance with generally accepted  accounting  principles
     consistently  applied  throughout  the  periods  involved  except as may be
     otherwise stated therein;  provided,  however, that the unaudited financial
     statements are subject to normal recurring year-end adjustments (which will
     in any case not be  material)  and do not  contain all  footnotes  required
     under generally  accepted  accounting  principles).  The selected financial
     data included in the Offering  Memorandum  present  fairly the  information
     shown therein and have been compiled on a basis consistent with the audited
     financial statements referred to above.

          (l) Except as described in the Offering Memorandum,  subsequent to the
     respective  dates  as  of  which  information  is  given  in  the  Offering
     Memorandum  through the date  hereof,  there has not been (i) any  material
     adverse change in the business,  properties or assets described or referred
     to in the  Offering  Memorandum,  or the results of  operations,  condition
     (financial  or  otherwise)  earnings,  operations,   business  or  business
     prospects,  of the Company,  (ii) any  transaction  that is material to the
     Company,  except transactions in the ordinary course of business and except
     as described  in the  Offering  Memorandum,  (iii) any  obligation  that is
     material to the  Company,  direct or  contingent,  incurred by the Company,
     except  obligations  incurred in the ordinary course of business,  (iv) any
     change in the capital  stock or  outstanding  indebtedness  of the Company,
     which is material to the Company,  except for the exercise of stock options
     disclosed as  outstanding,  or (v) any dividend or distribution of any kind
     declared, paid or made on the capital stock of the Company.

          (m) Except as set forth in the  Offering  Memorandum,  (i) the Company
     has good  and  marketable  title  to all  properties  and  material  assets
     described in the Offering  Memorandum as owned by it, free and clear of any
     pledge, lien, security interest,  encumbrance,  claim or equitable interest
     other than such as are not material to the  business of the  Company,  (ii)
     the  agreements  to which the Company is a party  described in the Offering
     Memorandum  are valid  agreements in full force and effect,  enforceable by
     the Company, except as the enforcement thereof may be limited by applicable
     bankruptcy,  insolvency,  reorganization,  moratorium or other similar laws
     affecting  creditors' rights generally or by general  equitable  principles
     and,  to the  knowledge  of the  Company,  the other  contracting  party or
     parties thereto are not in material breach or material default under any of
     such agreements, and (iii) the Company has valid and enforceable leases for
     the  properties  described in the Offering  Memorandum as leased by it with
     such  exceptions as are not material,  except as enforcement may be limited
     by applicable bankruptcy, insolvency,  reorganization,  moratorium or other
     similar laws  relating to or affecting  creditors'  rights  generally or by
     general equitable principles.

          (n) Except as disclosed in the Offering Memorandum, (i) the Company is
     in  compliance  in  all  material   respects  with  all  rules,   laws  and
     regulations, and has all necessary permits, relating to the use, treatment,
     storage and disposal of toxic  substances  and  protection of health or the
     environment  ("Environmental  Laws") which are  applicable to its business,
     (ii)  the  Company  has not  received  any  notice  from  any  governmental
     authority  or third party of an asserted  claim under  Environmental  Laws,
     (iii) to the knowledge of the Company, no facts


                                        6
<PAGE>


     currently  exist that will  require  the  Company to make  future  material
     capital  expenditures  to comply with  Environmental  Laws, and (iv) to the
     knowledge of the Company, no property which is or has been owned, leased or
     occupied by the Company has been designated as a Superfund site pursuant to
     the Comprehensive Environmental Response, Compensation and Liability Act of
     1980, as amended (42 U.S.C. ss. 9601, et seq.), or otherwise  designated as
     a contaminated site under applicable state or local law.

          (o) The Company has filed all  necessary  federal and state income and
     franchise  tax  returns  and has paid all taxes  due,  and there are no tax
     payment  or  filing  deficiencies  that  have  been  or,  to the  Company's
     knowledge, might be asserted against the Company that might have a material
     adverse  effect  on  the  condition  (financial  or  otherwise),  earnings,
     operations, business or business prospects of the Company considered as one
     enterprise; all tax liabilities are adequately provided for on the books of
     the Company, in all material respects.

          (p) The Company  maintains  insurance  of the types and in the amounts
     generally deemed adequate for its business,  including  without  limitation
     insurance  covering  real and  personal  property  owned or  leased  by the
     Company against theft, damage,  destruction,  acts of vandalism and, to the
     best of the  Company's  knowledge,  all  other  risks  customarily  insured
     against, all of which insurance is in full force and effect.

          (q) To the  knowledge  of the  Company,  no labor  disturbance  by the
     employees of the Company  exists or is imminent;  no collective  bargaining
     agreement exists with any of the Company's  employees and, to the knowledge
     of the Company, no such agreement is imminent.

          (r) The  Company has not been  advised,  and has no reason to believe,
     that it is not  conducting  business  in  compliance  with all of the laws,
     rules  and  regulations  of the  jurisdictions  in which  it is  conducting
     business  except  where  failure  to be so in  compliance  would not have a
     material  adverse  effect  on  the  condition   (financial  or  otherwise),
     earnings, operations, business or business prospects of the Company.

          (s) The Company has not distributed  and will not distribute  prior to
     the Closing Date or on any date on which Shares are to be purchased, as the
     case may be, any offering material in connection with the offering and sale
     of the Shares other than the Offering Memorandum.

          (t) The  Company  has not at any time  during  the last five years (i)
     made any unlawful  contribution  to any  candidate for foreign  office,  or
     failed to disclose fully any contribution in violation of law, or (ii) made
     any payment to any federal or state  governmental  officer or official,  or
     other person charged with similar public or quasi-public duties, other than
     payments  required  or  permitted  by the laws of the United  States of any
     jurisdiction thereof.


                                       7
<PAGE>


          (u) The  Company  has  not  taken  and  will  not  take,  directly  or
     indirectly,  any action  designed to, or that might be reasonably  expected
     to, cause or result in  stabilization  or  manipulation of the price of the
     Shares to facilitate the sale or resale of the Shares.

          (v) The Company is not an "investment  company"  within the meaning of
     the Investment Company Act of 1940, as amended.

     4. Appointment of Placement Agent; Agreements of Placement Agent.

          (a) Subject to the terms and conditions stated in this Agreement,  the
     Company  hereby  appoints the Placement  Agent its placement  agent for the
     purpose  of  offering  and  selling  the Shares in a private  placement  to
     "accredited investors" as defined in Rule 501(a) under the Act.

          (b) In connection with the offers and sales of the Shares, the Company
     will pay the  Placement  Agent a  placement  agent fee for its  services in
     acting as Placement  Agent for the Company in the sale of the Shares in the
     amount of $900,000,  provided  that in no event shall such fee exceed 6% of
     the  gross  proceeds  to the  Company  from  the  sale of the  Shares  (the
     "Placement Agent Fee").

          (c) The Placement  Agent will use diligent  efforts to sell the Shares
     on  behalf  of the  Company  at the price and on the terms set forth in the
     Offering Memorandum and the Purchase Agreement; provided, however, that the
     Company  understands  that the  Placement  Agent has no  obligation to find
     Purchasers.  The  Placement  Agent  will use  diligent  efforts  to  obtain
     performance  by  each  Purchaser,  but the  Placement  Agent  will  have no
     liability to the Company in the event any such purchase is not  consummated
     for any reason not related to the gross negligence or willful misconduct of
     the Placement  Agent. The Company also understands that the Placement Agent
     is under no obligation to purchase any Shares for its own account. While it
     is  contemplated   that  the  Placement  Agent  may  purchase  Shares  from
     Purchasers and resell such Shares in its capacity as a market-maker  or may
     act as agent  in the  resale  of  Shares  in  brokerage  transactions,  the
     Placement  Agent shall not act as an underwriter in connection with resales
     of the  Shares  or  participate  in any other  way in the  drafting  of the
     Registration Statement or the resale of the Shares.

          (d) The Placement  Agent agrees that in carrying out the  transactions
     contemplated by this Agreement, it has observed and will observe and comply
     with (i) all applicable securities laws, regulations,  rules and ordinances
     in any jurisdiction in which the Shares may be offered,  sold or delivered,
     including, without limitation, Rule 502 and Rule 506 under the Act and (ii)
     all  applicable  regulations  and  rules  of the  National  Association  of
     Securities Dealers,  Inc.; provided,  however,  that except as specifically
     provided  herein,  the Placement  Agent assumes no  responsibility  for the
     accuracy  or  completeness   of  information   contained  in  the  Offering
     Memorandum or provided to Purchasers  in connection  with their  investment
     decisions.


                                        8
<PAGE>


          (e) The  Placement  Agent agrees that (i) it will deliver the Offering
     Memorandum  to all  purchasers  prior to their  execution  of the  Purchase
     Agreement,  (ii) it will not deliver the Offering  Memorandum to any person
     that it does not reasonably  believe to be an "accredited  investor"  under
     Section 501(a) of the Act, (iii) promptly upon receipt of a notice pursuant
     to Section 5(d) hereto, it shall suspend offers for sale, and solicitations
     of purchases,  of the Shares and cease using the Offering  Memorandum until
     such time as the  Company  advises the  Placement  Agent that it may resume
     offers for sale, and solicitations of purchases,  of the Shares and (vi) it
     will not  deliver any  materials  regarding  the Company to the  purchasers
     other than the Offering Memorandum.

          (f) The Company will pay all  expenses,  fees and taxes in  connection
     with (i) the  preparation  and  printing and  reproducing  of copies of the
     Offering Memorandum and all amendments and supplements  thereto,  including
     in each case all  documents  incorporated  by reference  therein,  and this
     Agreement,  (ii) the delivery of the Shares,  (iii) the  qualification  for
     offer and sale of the Shares under securities laws as aforesaid  (including
     filing fees and reasonable fees and  disbursements of the Placement Agent's
     counsel in connection  therewith) and all registrations and listings of the
     Shares,  (iv) the furnishing of the opinions of counsel for the Company and
     other certificates referred to herein, (v) travel and related expenses with
     respect to Company  personnel in connection  with any road show and (vi) up
     to $50,000 of the expenses of the Placement  Agent in  connection  with the
     sale of the  Shares,  including  expenses  related to visits to the Company
     with  prospective  Purchasers  or any road show  expenses of the  Placement
     Agent and the reasonable  fees and costs of counsel for the Placement Agent
     in connection with the transactions  contemplated hereby or by the Purchase
     Agreement.

     5. Agreements of the Company. The Company agrees:

          (a) to use its best  efforts to qualify  the Shares for offer and sale
     as  contemplated  hereby in such  jurisdictions  as the Placement Agent may
     reasonably  designate and to continue such  qualifications in effect for so
     long as may be required in connection with the sale of the Shares; provided
     that the Company shall not be required to qualify as a foreign  corporation
     or dealer in securities or to a general consent to service of process or to
     file an annual report in any jurisdiction;

          (b) to  deliver  to the  Placement  Agent  without  charge  as soon as
     practicable  after each  supplement  to the Offering  Memorandum or amended
     Offering  Memorandum  has been  prepared,  as many  copies of the  Offering
     Memorandum  as then  amended or  supplemented  as the  Placement  Agent may
     reasonably  request  for  the  purposes  contemplated  by the  Act or  this
     Agreement;

          (c) to advise the Placement Agent promptly  (confirming such advice in
     writing)  of any  request  made by the  Commission  for  amendments  to any
     document  included or incorporated by reference in the Offering  Memorandum
     or the Registration Statement, or of the


                                        9
<PAGE>


     initiation  or  threatened  initiation  of  proceedings  for the purpose of
     entering a stop order with  respect to the  Registration  Statement  or for
     additional information with respect to any thereof;

          (d) for so long as sales  pursuant to this  Agreement and the Purchase
     Agreement are  continuing  and either (i) any event shall occur as a result
     of which the Offering  Memorandum  would include any untrue  statement of a
     material fact or omit to state any material fact necessary in order to make
     the statements  therein, in the light of the circumstances under which they
     were made,  when such Offering  Memorandum is delivered,  not misleading or
     (ii) for any other reason it shall be necessary to amend or supplement  the
     Offering  Memorandum  or to  file  under  the  Exchange  Act  any  document
     incorporated  by reference in the  Offering  Memorandum  in order to comply
     with the Act or the Exchange Act, to notify the Placement Agent promptly to
     suspend offers for sale and  solicitations of purchases of the Shares;  the
     Placement  Agent agrees that promptly  after the receipt of such notice the
     Placement Agent will suspend offers for sale and solicitations of purchases
     of the Shares and cease using the Offering  Memorandum;  and if the Company
     shall  determine so to amend or  supplement  the Offering  Memorandum or to
     file such  document  under the Exchange Act, the Company will so advise the
     Placement Agent and will promptly prepare an amendment or supplement to the
     Offering Memorandum or a document as required by the Exchange Act and will,
     in the case of a  document  required  under  the  Exchange  Act,  file such
     document with the  Commission  that will correct such statement or omission
     or effect such  compliance and will advise the Placement  Agent when it may
     resume offers for sale, and solicitations of purchases, of the Shares.

     6.  Conditions to Placement  Agent's  Obligations.  The  obligations of the
Placement Agent hereunder shall be subject, in its discretion,  to the following
conditions:

          (a)  All  representations,  warranties  and  other  statements  of the
     Company shall be at the Closing true and correct in all material respects.

          (b) The Company  shall have  performed  in all  material  respects its
     obligations hereunder.

          (c) No court or  administrative  order  prohibiting  the Closing shall
     have been issued and no  proceedings  for that purpose  shall be pending or
     threatened.

          (d) All  corporate  proceedings  and other legal matters in connection
     with this Agreement,  the Purchase  Agreement,  the Offering Memorandum and
     the  authorization,  issue, sale and delivery of the Shares shall have been
     reasonably satisfactory to counsel for the Placement Agent, and the Company
     shall have furnished to counsel for the Placement  Agent such documents and
     information  as it may have  requested  for the  purpose  of  enabling  the
     Placement Agent to pass upon the legal matters referred to above.


                                       10
<PAGE>


          (e) The  Placement  Agent shall have  received  an opinion  reasonably
     satisfactory  to the  Placement  Agent,  dated as of the Closing  Date,  of
     Dorsey & Whitney LLP, counsel to the Company,  substantially in the form of
     Exhibit A to this Agreement.

          (f) The  Placement  Agent shall have  received  an opinion  reasonably
     satisfactory  to the  Placement  Agent,  dated as of the Closing  Date,  of
     patent  counsel to the  Company,  with  respect to the matters set forth on
     Exhibit D to the Purchase Agreement.

          (g) The Company shall have furnished the Placement Agent a certificate
     of the Company,  dated as of the Closing Date and executed by the President
     of the Company,  stating that,  since the date as of which  information  is
     given in the  Offering  Memorandum,  (i) the Company has not  incurred  any
     liabilities or obligations,  contingent or otherwise,  that are material in
     the  aggregate  to the  Company,  taken as a whole,  except in the ordinary
     course of business,  (ii) there has been no material  adverse change in the
     condition or results of operations, financial or otherwise, of the Company;
     (iii)  there has been no document  required to be filed under the  Exchange
     Act and the rules and  regulations  thereunder  that has not been so filed,
     (iv) no order  preventing the Closing is in effect and no  proceedings  for
     that  purpose  are pending or  threatened  by the  Commission,  and (v) all
     representations  and  warranties  of the Company  herein are true as of the
     Closing.

          (h) The Registration Statement registering the resale of the Shares by
     the  Purchasers  shall have been filed with and  declared  effective by the
     Commission,  and no stop order suspending the effectiveness  thereof and no
     proceedings therefor shall be pending or threatened by the Commission.

          (i) Prior to the Closing Date, the shares to be issued and sold by the
     Company  shall have been duly  authorized  for listing by the Nasdaq  Stock
     Market.

          (j) The Company shall have furnished to the Placement Agent such other
     affidavits  and  certificates  as to the accuracy and  completeness  of any
     statement in the Offering  Memorandum  as of the Closing Date and as to any
     other matter in connection with the transactions  contemplated hereby or by
     the Purchase Agreement as the Placement Agent may reasonably request.

     All opinions, letters, certificates and affidavits above mentioned shall be
deemed to be in compliance with this Section 6 only if they shall be in form and
substance reasonably satisfactory to counsel for the Placement Agent.

     In case any of the conditions  specified  above in this Section 6 shall not
have been  fulfilled,  the  Placement  Agent shall have no obligation to proceed
with any offer for sale, or any solicitation of purchases, of the Shares.


                                       11
<PAGE>


     7. Indemnification.

          (a) The Company  agrees to  indemnify,  defend and hold  harmless  the
     Placement  Agent and any person who controls the Placement Agent within the
     meaning of Section  15 of the Act or  Section 20 of the  Exchange  Act (the
     "Placement  Agent  Affiliates"),   from  and  against  any  loss,  expense,
     liability or claim (including the reasonable cost of investigation)  which,
     jointly or  severally,  any such  Placement  Agent  Affiliates  controlling
     person may incur insofar as such loss,  expense,  liability or claim arises
     out of or is based upon any untrue statement or alleged untrue statement of
     a material  fact  contained  in the  Offering  Memorandum  or  Registration
     Statement,  or  arises  out of or is based  upon any  omission  or  alleged
     omission  to state a material  fact  required  to be stated in either  such
     Offering  Memorandum  or  Registration  Statement  necessary  to  make  the
     statements  made therein not  misleading,  except insofar as any such loss,
     expense,  liability  or claim  arises  out of or is based  upon any  untrue
     statement or alleged  untrue  statement of a material fact contained in and
     in conformity with information  furnished in writing by the Placement Agent
     or any Placement  Agent  Affiliates  to the Company  expressly for use with
     reference  to  such  Placement   Agent  in  such  Offering   Memorandum  or
     Registration Statement.

          If any action is brought  against  the  Placement  Agent or  Placement
     Agent  Affiliate in respect of which  indemnity  may be sought  against the
     Company  pursuant to the foregoing  paragraph,  the  Placement  Agent shall
     promptly  notify the Company in writing of the  institution  of such action
     and the Company  shall  assume the defense of such  action,  including  the
     employment of counsel and payment of expenses.  Such Placement Agent or any
     Placement  Agent  Affiliate shall have the right to employ its or their own
     counsel  in  any  such  case,   such  counsel  which  shall  be  reasonably
     satisfactory  to the  Company,  but the fees and  expenses of such  counsel
     shall be at the  expense of such  Placement  Agent or any  Placement  Agent
     Affiliate  unless the employment of such counsel shall have been authorized
     in writing by the Company in connection  with the defense of such action or
     the Company shall not have  employed  counsel to have charge of the defense
     of such action or such  indemnified  party or the  Placement  Agent or such
     Placement Agent Affiliate shall have reasonably concluded that there may be
     defenses  available to it or them which are different from or additional to
     those  available  to the Company (in which case the Company  shall not have
     the right to direct the defense of such action on behalf of the indemnified
     party or parties), in any of which events such reasonable fees and expenses
     shall be borne by the Company and paid as  incurred  (it being  understood,
     however, that the Company shall not be liable for the expenses of more than
     one separate  counsel in any one action or series of related actions in the
     same jurisdiction  representing the indemnified  parties who are parties to
     such action).  Anything in this paragraph to the contrary  notwithstanding,
     the  Company  shall not be liable for any  settlement  of any such claim or
     action effected without its written consent.

          (b) The Placement Agent agrees to indemnify,  defend and hold harmless
     the Company,  its directors  and officers,  and any person who controls the
     Company  within  the  meaning of Section 15 of the Act or Section 20 of the
     Exchange Act (the "Company Affiliates") 


                                       12
<PAGE>


     from and against  any loss,  expense,  liability  or claim  (including  the
     reasonable cost of investigation) which, jointly or severally,  the Company
     or any Company Affiliate may incur insofar as such loss, expense, liability
     or claim (i) arises out of or is based upon any untrue statement or alleged
     untrue  statement of a material fact  contained in and in  conformity  with
     information  furnished in writing by or on behalf of the Placement Agent to
     the Company  expressly for use with reference to the Placement Agent in the
     Offering Memorandum or Registration  Statement, or (ii) arises out of or is
     based upon the gross  negligence  or willful  misconduct  of the  Placement
     Agent with respect to this Agreement as determined in a final judgment by a
     Court of  competent  jurisdiction  from which no appeal can be or is taken.
     Neither the Placement  Agent nor any Placement  Agent  Affiliate shall have
     any liability (whether direct or indirect,  by statute, in contract or tort
     or otherwise)  to the Company or to any third party in connection  with the
     Registration Statement or the resale by the Purchasers of the Shares.

          If any action is brought against the Company or the Company Affiliates
     or any such person in respect of which  indemnity may be sought against the
     Placement  Agent pursuant to the foregoing  paragraph,  the Company or such
     Company  Affiliate  shall promptly notify the Placement Agent in writing of
     the  institution  of such action and the  Placement  Agent shall assume the
     defense of such action,  including the employment of counsel and payment of
     expenses.  The Company or such  Company  Affiliate  shall have the right to
     employ its own counsel in any such case,  but the fees and expenses of such
     counsel  shall be at the expense of the Company or such  Company  Affiliate
     unless (i) the  employment  of such counsel  shall have been  authorized in
     writing  by the  Placement  Agent in  connection  with the  defense of such
     action, (ii) or the Placement Agent shall not have employed counsel to have
     charge of the defense of such action,  (iii) or such  indemnified  party or
     the Company or such Company Affiliates shall have reasonably concluded that
     there may be defenses  available to it or them which are different  from or
     additional  to those  available to the  Placement  Agent (in which case the
     Placement  Agent  shall not have the right to direct  the  defense  of such
     action on  behalf of the  indemnified  party or  parties),  in any of which
     events such  reasonable  fees and expenses  shall be borne by the Placement
     Agent  and  paid as  incurred  (it  being  understood,  however,  that  the
     Placement  Agent  shall not be  liable  for the  expenses  of more than one
     separate counsel in any one action or series of related actions in the same
     jurisdiction  representing the indemnified  parties who are parties to such
     action).  Anything in this paragraph to the contrary  notwithstanding,  the
     Placement Agent shall not be liable for any settlement of any such claim or
     action effected without the written consent of the Placement Agent.

          (c)  If  the  indemnification  provided  for  in  this  Section  7  is
     unavailable to an indemnified  party under  subsections (a) and (b) of this
     Section 7 with  respect  of any  losses,  expenses,  liabilities  or claims
     referred to therein,  then each applicable  indemnifying  party, in lieu of
     indemnifying such indemnified party, shall contribute to the amount paid or
     payable by such  indemnified  party as a result of such  losses,  expenses,
     liabilities  or claims (i) in such  proportion as is appropriate to reflect
     the  relative  benefits  received  by the  Company  on the one hand and the
     Placement  Agent on the other hand from the  offering of the Shares or (ii)
     if the  allocation  provided  by  clause  (i)  above  is not  permitted  by
     applicable law, in such proportion


                                       13
<PAGE>


     as is appropriate to reflect not only the relative  benefits referred to in
     clause (i) above but also the relative fault of the Company on the one hand
     and of the Placement  Agent on the other in connection  with the statements
     or  omissions  which  resulted in such  losses,  expenses,  liabilities  or
     claims,  as  well  as any  other  relevant  equitable  considerations.  The
     relative benefits received by the Company on the one hand and the Placement
     Agent on the  other  shall be deemed  to be in the same  proportion  as the
     total proceeds from the offering (net of the Placement Agent Fee but before
     deducting  expenses)  received by the Company bear to the  Placement  Agent
     Fee. The relative fault of the Company on the one hand and of the Placement
     Agent on the other shall be determined by reference to, among other things,
     whether the untrue statement or alleged untrue statement of a material fact
     or  omission or alleged  omission  relates to  information  supplied by the
     Company  or by the  Placement  Agent  and  the  parties'  relative  intent,
     knowledge, access to information and opportunity to correct or prevent such
     statement or omission. The amount paid or payable by a party as a result of
     the losses,  expenses,  liabilities  and claims  referred to above shall be
     deemed to include any legal or other fees or expenses  reasonably  incurred
     by such party in connection  with  investigating  or defending any claim or
     action. 

          (d) The  Company  and the  Placement  Agent agree that it would not be
     just  and  equitable  if  contribution  pursuant  to  this  Section  7 were
     determined by pro rata allocation or by any other method of allocation that
     does  not take  account  of the  equitable  considerations  referred  to in
     subsection (c) above. Notwithstanding the provisions of this Section 7, the
     Placement Agent shall not be required to contribute any amount in excess of
     the amount by which the total price at which the Shares  were sold  exceeds
     the amount of any damages  which the  Placement  Agent has  otherwise  been
     required  to pay by reason  of such  untrue  statement  or  alleged  untrue
     statement or omission or alleged  omission.  No person guilty of fraudulent
     misrepresentation shall be entitled to contribution from any person who was
     not guilty of such fraudulent misrepresentation.

          (e)  The  indemnity  and  contribution  agreements  contained  in this
     Section 7 and the covenants,  warranties and representations of the Company
     contained  in  this  Agreement  shall  remain  in  full  force  and  effect
     regardless of any investigation made by or on behalf of the Placement Agent
     or any  Placement  Agent  Affiliate,  or by or on behalf of the  Company or
     Company  Affiliate,  and shall survive any termination of this Agreement or
     the  issuance  and  delivery of the Shares.  The Company and the  Placement
     Agent  agree  promptly  to  notify  the  other of the  commencement  of any
     litigation  or  proceeding  against  it and,  in the  case of the  Company,
     against any of the  Company  Affiliates,  and in the case of the  Placement
     Agent, any Placement Agent  Affiliate,  in connection with the issuance and
     sale of the  Shares,  or in  connection  with the  Offering  Memorandum  or
     Registration Statement.

     8.  Survival of Certain  Provisions.  The  indemnity  and other  agreements
contained in Section 7 hereof and the  representations  and warranties and other
statements  of the  Company set forth in this  Agreement  or made by the Company
pursuant to this Agreement shall remain in full force and effect,  regardless of
(i) any  termination of this  Agreement,  (ii) any  investigation  made by or on
behalf


                                       14
<PAGE>


of the Placement Agent or any of its  controlling  persons or by or on behalf of
the Company or any of its officers,  directors or controlling  persons and (iii)
acceptance of delivery of and payment for Shares.

     9. Effective Time: Termination.

          (a) This Agreement shall become  effective at the earlier of (i) 10:00
     a.m., New York Time, on the first full business day following the execution
     hereof or (ii) the time of the initial offering of any of the Shares by the
     Placement Agent after the execution  hereof.  By giving notice as set forth
     in Section 10 hereof before the time this Agreement becomes effective,  the
     Placement  Agent or the Company may prevent this  Agreement  from  becoming
     effective  without  liability of any party to any other party,  except that
     the Company shall remain  obligated to pay costs and expenses to the extent
     provided in Section 4 of this Agreement.

          (b) The  Placement  Agent  shall  have  the  right to  terminate  this
     Agreement by giving notice as hereinafter specified at any time at or prior
     to the Closing Date, (i) if the Company shall have failed,  refused or been
     unable at or prior to the Closing Date to perform any agreement on its part
     to be performed,  or because any other  condition of the Placement  Agent's
     obligations  hereunder  required  to be  fulfilled  by the  Company  is not
     fulfilled,  or (ii) if trading in securities on the New York Stock Exchange
     shall have been suspended or minimum prices shall have been  established on
     the New York Stock Exchange,  by the New York Stock Exchange or by order of
     the Commission or any other governmental authority having jurisdiction,  or
     (iii) if a banking  moratorium  shall have been  declared by federal or New
     York  authorities,  or (iv) if on or prior to the Closing  Date the Company
     shall have sustained a loss by strike, fire, flood, earthquake, accident or
     other  calamity  of such  character  as to  interfere  materially  with the
     conduct of the business and operations of the Company regardless of whether
     or not such loss shall have been insured, or (v) if there shall have been a
     material adverse change in the general political or economic  conditions or
     financial markets in the United States as in the reasonable judgment of the
     Placement Agent makes it inadvisable or  impracticable  to proceed with the
     offering,  sale and  delivery of the Shares,  or (vi) if on or prior to the
     Closing Date there shall have been any material  outbreak or  escalation of
     hostilities or other national or  international  calamity or crisis of such
     magnitude in its effect on the  financial  markets of the United States as,
     in the reasonable  judgment of the Placement Agent,  makes it impracticable
     or inadvisable to market the Shares.  Any such termination shall be without
     liability  of any party to any other party except as provided in Sections 4
     and 7 hereof.

          If the Placement  Agent elects to prevent this Agreement from becoming
     effective or to terminate  this Agreement as provided in this Section 9, it
     shall promptly  notify the Company by telephone,  telecopy or telegram,  in
     each case  confirmed by letter.  If the Company shall elect to prevent this
     Agreement from becoming  effective,  the Company shall promptly  notify the
     Placement Agent by telephone,  telecopy or telegram, in each case confirmed
     by letter.

          (c) In the event that the Closing shall not have occurred on or before
     August 31, 1998, this Agreement shall terminate at the close of business on
     such date. Any such


                                       15
<PAGE>


     termination  shall be  without  liability  of any party to any other  party
     except as provided in Sections 4, 7 and 9(d) hereof.

          (d) In the event of any  termination of this Agreement for any reason,
     if  a  private  placement  of  securities  is  consummated  following  such
     termination on or before November 30, 1998 by the Company with a party that
     the Placement Agent has contacted  regarding the Company pursuant to and as
     part of its  engagement by the Company and that has been  identified to the
     Company in writing prior to or within ten days following such  termination,
     the  Placement  Agent shall be  entitled  to receive a placement  agent fee
     equal to 6% of the gross proceeds  received by the Company for such private
     placement, reimbursement of expenses, and all other amounts provided for in
     this Agreement, as if this Agreement had not been terminated.

     10.  Notice.   Except  as  otherwise   specifically  provided  herein,  all
statements,  requests,  notices and advice hereunder shall be in writing,  or by
telephone  or  telegram if  subsequently  confirmed  in writing,  and, if to the
Placement Agent, shall be sufficient in all respects if delivered or sent to the
Placement Agent at the address set forth in the Offering Memorandum,  and, if to
the  Company,  shall be  sufficient  in all respects if delivered or sent to the
Company  at the  address of its  principal  place of  business  set forth in the
Offering  Memorandum.  Notice shall be deemed given upon the date of delivery or
the date such notice is sent.

     11.  Successors  and  Assigns.  This  Agreement  shall inure  solely to the
benefit of the Company and the  Placement  Agent and, to the extent  provided in
Section  7 hereof,  to any  person or  entity  named in such  Section.  No other
person, partnership,  association or corporation shall acquire or have any right
under or by virtue of this Agreement.  The term  "successors"  shall not include
any  purchaser of any Shares merely  because of such  purchase.  The  respective
rights and  obligations of the Company and the Placement Agent hereunder may not
be assigned, transferred or contracted to another.

     12.  Governing  Law. This  Agreement  shall be governed by and construed in
accordance  with the internal laws of the State of New York,  without  regard to
conflicts of law principles.

     13. Entire  Agreement.  This Agreement is the complete and entire agreement
among  the  parties  with  respect  to the  offer  and  sale of the  Shares  and
supersedes  all prior  written and oral  communications  with  respect  thereto,
specifically  including  any  engagement  letter  with  respect  to the  matters
addressed herein between the Company and the Placement  Agent;  provided however
that the confidentiality agreement contained in the second sentence of Section 3
and in Section 8 of the engagement  letter dated May 4, 1998 between the Company
and the Placement Agent shall remain in full force and effect in accordance with
its  terms.  This  Agreement  may be  amended  only in a writing  signed by both
parties hereto.


                                       16
<PAGE>


     14.   Counterparts.   This  Agreement  may  be  executed  in  one  or  more
counterparts,  each of  which  shall be  deemed  an  original,  but all of which
together shall constitute one and the same instrument.


                                       17
<PAGE>


     Please  confirm  that the  foregoing  correctly  sets  forth the  agreement
between us by signing in the space provided below for that purpose.

                                                  Very truly yours,

                                                  ENZON, INC.




                                                  By:/s/ ILLEGIBLEs
                                                  ------------------------------
                                                  Its: Presidenrt and CEO
                                                  ------------------------------
AGREED AND ACCEPTED:

SBC WARBURG DILLON READ INC.


By:  /s/ ILLEGIBLE
     --------------------------------------
Its:  Executive Director 
     --------------------------------------


By:  /s/ ILLEGIBLE
     --------------------------------------
Its:  Associate Director
     --------------------------------------



                                                                    EXHIBIT 21.0

                           SUBSIDIARIES OF REGISTRANT




Symvex Inc. is a wholly-owned  subsidiary of the Registrant  incorporated in the
State of Delaware. Symvex Inc. did business under its own name.

Enzon Labs Inc. is a wholly-owned  subsidiary of the Registrant  incorporated in
the State of Delaware. Enzon Labs Inc. does business under its own name.

Enzon  GmbH is a  wholly-owned  subsidiary  of the  Registrant  incorporated  in
Germany.

                                      E-23


                                                                    EXHIBIT 23.0

                          INDEPENDENT AUDITORS' CONSENT



The Board of Directors
Enzon, Inc.:

We consent to  incorporation  by reference in the  Registration  Statements  No.
33-50904,  333-18051 and 33-19933 on Form S-8 and  Registration  Statements  No.
333-32093,  333-46117  and  333-58269  on Form S-3 of Enzon,  Inc. of our report
dated September 8, 1998,  relating to the consolidated  balance sheets of Enzon,
Inc. and subsidiaries as of June 30, 1998 and 1997, and the related consolidated
statements of operations,  stockholders'  equity, and cash flows for each of the
years in the three-year  period ended June 30, 1998, which report appears in the
June 30, 1998 annual report on Form 10-K of Enzon, Inc.


                                             /s/ KPMG Peat Marwick LLP
                                                 KPMG Peat Marwick LLP


Short Hills, New Jersey
September __, 1998


                                       E24


<TABLE> <S> <C>


<ARTICLE>                     5
<LEGEND>
This schedule contains summary financial  information  extracted from the Enzon,
Inc. and  Subsidiaries  Consolidated  Balance  Sheet as of June 30, 1998 and the
Consolidated  Statement  of  Operations  for the year ended June 30, 1998 and is
qualified in its entirety by reference to such financial statements.            
</LEGEND>
       
<S>                                            <C>
<PERIOD-TYPE>                                       12-MOS
<FISCAL-YEAR-END>                              JUN-30-1998
<PERIOD-END>                                   JUN-30-1998
<CASH>                                           6,478,459
<SECURITIES>                                             0
<RECEIVABLES>                                    2,300,046
<ALLOWANCES>                                             0
<INVENTORY>                                      1,022,530
<CURRENT-ASSETS>                                10,248,987
<PP&E>                                          15,134,075
<DEPRECIATION>                                  13,368,330
<TOTAL-ASSETS>                                  13,741,378
<CURRENT-LIABILITIES>                            6,087,678
<BONDS>                                                  0
                                    0
                                          1,070
<COMMON>                                           313,414
<OTHER-SE>                                       6,612,056
<TOTAL-LIABILITY-AND-EQUITY>                    13,741,378
<SALES>                                         12,312,730
<TOTAL-REVENUES>                                14,644,032
<CGS>                                            3,645,281
<TOTAL-COSTS>                                   18,725,089
<OTHER-EXPENSES>                                         0
<LOSS-PROVISION>                                         0
<INTEREST-EXPENSE>                                  13,923
<INCOME-PRETAX>                                 (3,617,133)
<INCOME-TAX>                                             0
<INCOME-CONTINUING>                             (3,617,133)
<DISCONTINUED>                                           0
<EXTRAORDINARY>                                          0
<CHANGES>                                                0
<NET-INCOME>                                    (3,617,133)
<EPS-PRIMARY>                                        (0.12)
<EPS-DILUTED>                                            0
                                                           
                                                

</TABLE>


                                                                    EXHIBIT 99.0


                    Certain Factors to Consider in Connection
                         with Forward Looking Statements


Accumulated  Deficit and  Uncertainty of Future  Profitability.  The Company was
originally  incorporated  in 1981. To date,  the Company's  sources of cash have
been the  proceeds  from the sale of its  stock  through  public  offerings  and
private  placements,   sales  of  its  FDA  approved  products,   ADAGEN(R)  and
ONCASPAR(R);  sales of its products for research purposes; contract research and
development fees; technology transfer and license fees; and royalty advances. At
June  30,  1998,  the  Company  had  an  accumulated  deficit  of  approximately
$116,842,000.  The Company expects to incur operating losses for the foreseeable
future.  To date, ADAGEN and ONCASPAR are the only products of the Company which
have been approved for  marketing in the United  States by the FDA,  having been
approved in March 1990 and February 1994,  respectively.  In addition,  ONCASPAR
has been  approved  for  marketing  in Canada,  Germany and Russia.  In order to
achieve profitable  operations on a continuing basis, the Company,  either alone
or through its  partners,  must  successfully  manufacture,  market and sell its
ADAGEN and ONCASPAR  products and develop,  manufacture and market the Company's
products  which are under  development.  These products are in various stages of
development,  and the period necessary to achieve regulatory approval and market
acceptance of any  individual  product is uncertain and  typically  lengthy,  if
achievable at all.  Potential  investors  should be aware of the  difficulties a
biopharmaceutical enterprise such as the Company encounters,  especially in view
of the intense  competition in the pharmaceutical  industry in which the Company
competes.  There  can be no  assurance  that the  Company's  plans  will  either
materialize or prove  successful,  that its products under  development  will be
successfully developed or that its products will generate revenues sufficient to
enable the Company to achieve profitability.

Raw Materials and Dependence  Upon  Suppliers.  Except for  PEG-hemoglobin,  the
Company purchases the unmodified compounds utilized in its approved products and
products under  development  from outside  suppliers.  There can be no assurance
that the purified bovine  hemoglobin  used in the manufacture of  PEG-hemoglobin
can be produced by the  Company in the amounts  necessary  to expand the current
clinical trials. The Company may be required to enter into supply contracts with
outside suppliers for certain unmodified compounds. The Company does not produce
the  unmodified  adenosine  deaminase  used in the  manufacture  of ADAGEN,  the
unmodified forms of  L-asparaginase  used in the manufacture of ONCASPAR and the
unmodified  camptothecin  used in the Company's  PROTHECAN(TM)  product which is
under  development  and has a supply  contract with an outside  supplier for the
supply  of each  of  these  unmodified  compounds.  Delays  in  obtaining  or an
inability to obtain any  unmodified  compound,  including  unmodified  adenosine
deaminase,  unmodified  L-asparaginase,  unmodified  bovine blood, or unmodified
camptothecin  on  reasonable  terms,  or at all,  could have a material  adverse
effect on the Company's business, financial condition and results of operations.
In the event the  Company  is  required  to obtain an  alternate  source  for an
unmodified  compound  utilized in a product which is being sold  commercially or
which  is in  clinical  development,  the FDA and  relevant  foreign  regulatory
agencies will likely require the Company to perform  additional  testing,  which
would cause delays and additional  expenses,  to demonstrate  that the alternate
material is biologically  and chemically  equivalent to the unmodified  compound
previously  used. Such  evaluations  could include  chemical,  pre-clinical  and
clinical  studies and could delay  development of a product which is in clinical
trials,  limit  commercial sales of an approved product and cause the Company to
incur  significant  additional  expenses.  If  such  alternate  material  is not
demonstrated to be chemically and biologically equivalent to the previously used
unmodified  compound,  the Company will likely be required to repeat some or all
of the  pre-clinical  and  clinical  trials  conducted  for such  compound.  The
marketing  of an FDA  approved  drug  could be  disrupted  while  such tests are
conducted.  Even  if the  alternate  material  is  shown  to be  chemically  and
biologically  equivalent to the previously  used  compound,  the FDA or relevant
foreign regulatory agency may require the Company to conduct additional clinical
trials with such alternate material.

Recently the  Company's  quality  assurance  department  has observed  increased
levels of  particulates  in certain  batches on ONCASPAR which it  manufactures.
These batches were not shipped and the Company's  recent  rejection rate for the
manufacture  of  this  product  is   significantly   higher  than  it  has  been
historically. The Company is engaged in an extensive review of its manufacturing
procedures for this product and believes that the problem


<PAGE>


may be related  to  certain  materials  which are used in the  filling  process,
although this has not yet been  determined.  The Company has been in discussions
with the FDA  regarding  this  problem and expects to have  further  discussions
shortly  with the FDA. It is possible  that the FDA may not allow the Company to
ship ONCASPAR until this problem is resolved.  However, it is also possible that
the FDA may permit  the  Company to ship  units of  ONCASPAR  which the  Company
determines are free from  particulates,  including units currently on hand. This
problem may result in a temporary or extended  disruption in the distribution of
ONCASPAR.  An extended disruption could have a material adverse impact on future
ONCASPAR sales.

Patents and Proprietary Technology. The Company has licensed, and been issued, a
number of patents in the United States and other  countries and has other patent
applications pending to protect its proprietary technology. Although the Company
believes that its patents provide certain protection from competition, there can
be no  assurance  that  such  patents  will  be  of  substantial  protection  or
commercial benefit to the Company,  will afford the Company adequate  protection
from competing  products,  will not be challenged or declared  invalid,  or that
additional United States patents or foreign patent equivalents will be issued to
the  Company.  The scope of patent  claims for  biotechnological  inventions  is
uncertain and the Company's patents and patent  applications are subject to this
uncertainty.  The  Company  is  aware  of  certain  issued  patents  and  patent
applications  belonging  to third  parties,  and there may be other  patents and
patent  applications,  containing  subject  matter  which  the  Company  or  its
licensees  or  collaborators  may  require  in order  to  research,  develop  or
commercialize at least some of the Company's products. There can be no assurance
that licenses  under such patents and patent  applications  will be available on
acceptable terms or at all. If the Company does not obtain such licenses,  it or
its partners could  encounter  delays in product market  introductions  while it
attempts  to design  around  such  patents or could  find that the  development,
manufacture or sale of products requiring such licenses could be foreclosed.  If
the Company does obtain such  licenses it will in all  likelihood be required to
make  royalty and other  payments to the  licensers,  thus  reducing the profits
realized by the Company from the products  covered by such licenses.  In certain
cases, the Company has obtained  opinions of patent counsel that certain of such
patents,  including patents relevant to PEG- hemoglobin held by Biopure Inc. and
patents  relevant to PEG-Intron A held by Hoffman La Roche, are not infringed by
the  products  of the  Company or its  collaborators  or would not be held to be
valid if  litigated.  Such opinions have been relied upon by the Company and its
collaborators in continuing to pursue  development of the subject product.  Such
opinions  are not binding on any court and there can be no  assurance  that such
opinions  will prove to be correct and that a court would find any of the claims
of such patents to be invalid or that the Company or its collaborators  does not
infringe  such  patents.  The Company is aware that  certain  organizations  are
engaging in activities that infringe certain of the Company's PEG technology and
SCA patents.  There can be no assurance that the Company will be able to enforce
its patent and other rights against such organizations. The Company expects that
there may be significant  litigation in the industry regarding patents and other
proprietary rights and, if Enzon were to become involved in such litigation,  it
could consume a substantial amount of the Company's resources.  In addition, the
Company relies heavily on its proprietary  technologies for which pending patent
applications  have  been  filed  and on  unpatented  know-how  developed  by the
Company.  Insofar as the Company relies on trade secrets and unpatented know-how
to maintain its competitive  technological  position,  there can be no assurance
that  others may not  independently  develop  the same or similar  technologies.
Although the Company has taken steps to protect its trade secrets and unpatented
know-how,  third-parties  nonetheless may gain access to such  information.  The
Company has two research and license agreements with The Green Cross Corporation
("Green  Cross")  regarding  rHSA.  The  Company  and  Yoshitomi  Pharmaceutical
Industries,  Ltd.  ("Yoshitomi"),  the successor to Green Cross'  business,  are
currently in arbitration to resolve the amount of royalties that will be due the
Company,  if any.  Yoshitomi has filed documents in such  arbitration  seeking a
declaratory  judgment that under its agreement with the Company no royalties are
payable.  Any adverse decision from such an arbitration  proceeding could result
in a  material  adverse  effect  to the  Company's  future  business,  financial
condition and results of operations.  Research  Corporation  Technologies,  Inc.
("Research  Corporation") held the original patent upon which the PEG Process is
based and had  granted  the  Company  a  license  under  such  patent.  Research
Corporation's  patent  for  the  PEG  Process  in  the  United  States  and  its
corresponding  foreign  patents have expired.  Although the Company has obtained
several improvement patents in connection with the PEG Process,  there can be no
assurance  that  any of  these  patents  will  enable  the  Company  to  prevent
infringement or that competitors will not develop  competitive  products outside
the protection that may be afforded by these patents.  The Company is aware that
others have also filed patent  applications and have been granted patents in the
United  States and other  countries  with respect to the  application  of PEG to
proteins  and  other  compounds.  Based  upon  the  expiration  of the  Research
Corporation  patent,  other  parties  will be  permitted  to make,  use, or sell
products covered by the claims of the Research  Corporation


<PAGE>


patent, subject to other patents, including those held by the Company. There can
be no assurance that the expiration of the Research  Corporation patent will not
have a material adverse effect on the business,  financial condition and results
of operations of the Company.

Limited Sales and Marketing Experience;  Dependence on Marketing Partners. Other
than ADAGEN,  which the Company  markets on a worldwide basis to a small patient
population,  the Company does not engage in the direct  commercial  marketing of
any of its products and therefore does not have significant  sales and marketing
experience.  For certain of its  products,  the Company has  provided  exclusive
marketing  rights to its  corporate  partners  in  return  for  royalties  to be
received on sales.  With respect to ONCASPAR,  the Company has granted exclusive
marketing  rights in North  America and the Pacific Rim to RPR.  The Company has
also granted  exclusive  marketing rights in Europe and Russia to Medac Gmbh and
in Israel  to Tzamal  Pharma  Ltd..  The  Company  expects  to retain  marketing
partners to market ONCASPAR in other foreign markets, principally South America,
and is currently pursuing arrangements in this regard. There can be no assurance
that such  efforts  will result in the  Company  concluding  such  arrangements.
Regarding the marketing of certain of the Company's other future  products,  the
Company  expects to evaluate  whether to create a sales force to market  certain
products in the United States or to continue to enter into license and marketing
agreements with others for United States and foreign  markets.  These agreements
generally  provide that all or a  significant  portion of the marketing of these
products will be conducted by the Company's licensees or marketing partners.  In
addition,  under  certain  of  these  agreements,  the  Company's  licensees  or
marketing partners may have all or a significant  portion of the development and
regulatory approval responsibilities. There can be no assurance that the Company
will be able to control the amount and timing of resources  that any licensee or
marketing  partner may devote to the Company's  products or prevent any licensee
or marketing  partner from pursuing  alternative  technologies  or products that
could result in the  development  of products  that  compete with the  Company's
products and the  withdrawal of support for the Company's  products.  Should the
licensee  or  marketing  partner  fail to develop a  marketable  product (to the
extent it is responsible  for product  development)  or fail to market a product
successfully,  if it is developed,  the Company's business,  financial condition
and results of operations may be adversely  affected.  There can be no assurance
that the Company's  marketing  strategy will be successful.  Under the Company's
marketing and license agreements, the Company's marketing partners and licensees
may have the right to  terminate  the  agreements  and  abandon  the  applicable
products at any time for any reason without significant payments. The Company is
aware that certain of its marketing  partners are pursuing parallel  development
of products on their own and with other collaborative partners which may compete
with the  licensed  products and there can be no  assurance  that the  Company's
other  current or future  marketing  partners will not also pursue such parallel
courses.

Reimbursement from Third-Party  Payors.  Sales of the Company's products will be
dependent in part on the availability of reimbursement from third-party  payors,
such as governmental health administration authorities,  private health insurers
and  other   organizations.   Government  and  other   third-party   payors  are
increasingly  sensitive to the containment of health care costs and are limiting
both coverage and levels of reimbursement for new therapeutic  products approved
for  marketing,  and are  refusing,  in some cases,  to provide any coverage for
indications for which the FDA and other national health  regulatory  authorities
have not  granted  marketing  approval.  There  can be no  assurance  that  such
third-party payor  reimbursement will be available or will permit the Company to
sell its products at price levels  sufficient  for it to realize an  appropriate
return on its  investment  in product  development.  Since  patients who receive
ADAGEN  will be  required  to do so for  their  entire  lives  (unless a cure or
another treatment is developed),  lifetime limits on benefits which are included
in most  private  health  insurance  policies  could  permit  insurers  to cease
reimbursement for ADAGEN. Lack of or inadequate  reimbursement by government and
other  third  party  payors  for the  Company's  products  would have a material
adverse  effect on the Company's  business,  financial  condition and results of
operations.

Government  Regulation.   The  manufacturing  and  marketing  of  pharmaceutical
products in the United  States and abroad is subject to  stringent  governmental
regulation  and the sale of any of the  Company's  products for use in humans in
the United States will require the prior approval of the FDA. Similar  approvals
by  comparable  agencies  are required in most  foreign  countries.  The FDA has
established  mandatory  procedures  and  safety  standards  which  apply  to the
clinical  testing,   manufacture  and  marketing  of  pharmaceutical   products.
Pharmaceutical  manufacturing  facilities are also regulated by state, local and
other authorities. Obtaining FDA approval for a new therapeutic may take several
years and involve  substantial  expenditures.  ADAGEN was approved by the FDA in
March 1990.  ONCASPAR  was approved by the FDA in February  1994,  in Germany in
November 1994 and in Canada in 1997 in


<PAGE>


each case for patients with acute lymphoblastic  leukemia who are hypersensitive
to  native  forms  of  L-asparaginase.  ONCASPAR  was  approved  in  Russia  for
therapeutic use in a broad range of cancers. Except for these approvals, none of
the  Company's  other  products have been approved for sale and use in humans in
the United States or elsewhere.  There can be no assurance that the Company will
be able to obtain FDA approval for any of its other products.  In addition,  any
approved products are subject to continuing regulation, and noncompliance by the
Company with applicable  requirements  can result in criminal  penalties,  civil
penalties,  fines,  recall  or  seizure,  injunctions  requiring  suspension  of
production,  orders requiring  ongoing  supervision by the FDA or refusal by the
government to approve  marketing or export  applications or to allow the Company
to enter  into  supply  contracts.  Failure  to  obtain  or  maintain  requisite
governmental  approvals or failure to obtain or maintain  approvals of the scope
requested,  will delay or preclude  the Company or its  licensees  or  marketing
partners from  marketing  their  products,  or limit the  commercial  use of the
products,  and  thereby  may have a  material  adverse  affect on the  Company's
business, financial condition and results of operations.

Intense  Competition and Risk of  Technological  Obsolescence.  Many established
biotechnology and pharmaceutical  companies with resources greater than those of
the Company are engaged in activities  that are  competitive  with the Company's
and may  develop  products  or  technologies  which  compete  with  those of the
Company.  The Company is aware that other companies are engaged in utilizing PEG
technology  in  developing  drug  products.  There can be no assurance  that the
Company's  competitors  will not  successfully  develop,  manufacture and market
competing  products  utilizing  PEG  technology  or  otherwise.  Other  drugs or
treatment  modalities which are currently  available or that may be developed in
the  future,  and which treat the same  diseases  as those  which the  Company's
products are designed to treat, may be competitive with the Company's  products.
There can be no assurance that the Company will be able to compete  successfully
against current or future  competitors or that such  competition will not have a
material  adverse  effect on the  Company's  business,  financial  condition and
results of operations.  Rapid technological  development by others may result in
the  Company's   products  becoming  obsolete  before  the  Company  recovers  a
significant portion of the research,  development and commercialization expenses
incurred with respect to those products.  The Company's success,  in large part,
depends  upon  developing  and   maintaining  a  competitive   position  in  the
development of products and  technologies in its area of focus.  There can be no
assurance  that  the  Company's  competitors  will  not  succeed  in  developing
technologies  or products that are more  effective than any which are being sold
or developed by the Company or which would render the Company's  technologies or
products  obsolete  or  noncompetitive.  The  Company's  failure to develop  and
maintain a competitive position with respect to its products and/or technologies
would have a material  adverse effect on its business,  financial  condition and
results of operations.

Uncertainty of Market Acceptance.  The Company's products,  ONCASPAR and ADAGEN,
have  been  approved  by the FDA to  treat  patients  with  acute  lymphoblastic
leukemia  and  a  rare  form  of  severe  combined   immunodeficiency   disease,
respectively.  Neither  product has become  widely used due to the small patient
population and limited  indications  approved by the FDA. The Company's  current
research  and   development   efforts  are  directed   towards   developing  new
technologies  to aid in drug  delivery.  Assuming  that the  Company  is able to
develop such  technologies  and secure the requisite FDA  approvals,  the market
acceptance of any such  products will depend upon the  acceptance by the medical
community of the use of such  technologies.  There can be no assurance  that any
additional  products  will be  approved  by the FDA or that,  if  approved,  the
medical  community will use them. In addition,  the use of any such new products
will  depend  upon the extent of third party  medical  reimbursement,  increased
awareness of the  effectiveness  of such  technologies  and sales efforts by the
Company or any marketing partner.  The Company's  proprietary PEG technology has
received  only  limited  market  acceptance  to date.  Failure of the Company to
develop new FDA approved  products  and to achieve  market  acceptance  for such
products  would  have a  material  adverse  effect  on the  Company's  business,
financial condition and results of operation.

Potential Product Liability. The use of the Company's products during testing or
after  regulatory  approval  entails an inherent  risk of adverse  effects which
could  expose the Company to product  liability  claims.  The Company  maintains
product  liability  insurance  coverage  in the total  amount of $10 million for
claims  arising  from the use of its  products in clinical  trials  prior to FDA
approval and for claims arising from the use of its products after FDA approval.
There can be no assurance that the Company will be able to maintain its existing
insurance  coverage or obtain  coverage for the use of its other products in the
future. There can be no assurance that such insurance coverage and the resources
of the Company  would be  sufficient  to satisfy any  liability  resulting  from
product

<PAGE>


liability  claims or that a product  liability  claim  would not have a material
adverse  effect on the  Company's  business,  financial  condition or results of
operations.

Future Capital Needs; Uncertainty of Additional Financing. The Company's current
sources of liquidity  are its cash  reserves,  and interest  earned on such cash
reserves,  sales of ADAGEN and  ONCASPAR,  sales of its  products  for  research
purposes,  and license fees.  There can be no assurance as to the level of sales
of the Company's FDA approved  products,  ADAGEN and ONCASPAR,  or the amount of
royalties  realized  from  the  commercial  sale  of  ONCASPAR  pursuant  to the
Company's  licensing  agreements.  Total  cash  reserves,  including  short term
investments,  as of June 30,  1998,  were  approximately  $6,478,000,  and after
giving effect to the  approximately  $17,600,000 of net proceeds received by the
Company from the private placement completed in July 1998, will be approximately
$24,078,000.   Based  upon  its  currently   planned  research  and  development
activities and related costs and its current  sources of liquidity,  the Company
anticipates its current cash reserves will be sufficient to meet its capital and
operational  requirements for the foreseeable future. The Company's future needs
and the adequacy of available funds will depend on numerous  factors,  including
without limitation, the successful  commercialization of its products,  progress
in its product  development  efforts,  the  magnitude and scope of such efforts,
progress with preclinical studies and clinical trials,  progress with regulatory
affairs  activities,  the cost of filing,  prosecuting,  defending and enforcing
patent claims and other intellectual  property rights,  competing  technological
and market  developments,  and the  development  of strategic  alliances for the
marketing of its products.  There can be no assurance  that the Company will not
require  additional  financing for its currently planned capital and operational
requirements.   In  addition,   the  Company  may  seek  to  acquire  additional
technology, enter into strategic alliances and engage in additional research and
development programs,  which may require additional financing.  The Company does
not have any  committed  sources of  additional  financing,  and there can be no
assurance that additional funding, if necessary, will be available on acceptable
terms,  if at all. To the extent the Company is unable to obtain  financing,  it
may be required to curtail its activities or sell additional  securities.  There
can be no  assurance  that any of the  foregoing  fund raising  activities  will
successfully  meet the Company's  anticipated  cash needs. If adequate funds are
not  available,  the  Company's  business,  financial  condition  and results of
operations will be materially and adversely affected.

Dividend  Policy and  Restrictions.  The  Company has paid no  dividends  on its
Common  Stock,  since its  inception  and does not plan to pay  dividends on its
Common  Stock in the  foreseeable  future.  Except as may be utilized to pay the
dividends  payable on the Company's  Series A Cumulative  Convertible  Preferred
Stock (the  "Series A  Preferred  Stock"),  any  earnings  which the Company may
realize will be retained to finance the growth of the Company. In addition,  the
terms of the Series A Preferred Stock restrict the payment of dividends on other
classes and series of stock.

Possible  Volatility  of Stock  Price.  Historically,  the  market  price of the
Company's  Common Stock has  fluctuated  over a wide range and it is likely that
the price of the  Common  Stock  will  fluctuate  in the  future.  Announcements
regarding technical innovations,  the development of new products, the status of
corporate collaborations and supply arrangements,  regulatory approvals,  patent
or proprietary  rights or other  developments  by the Company or its competitors
could have a  significant  impact on the market  price of the Common  Stock.  In
addition,  due to one or more of the  foregoing  factors,  in one or more future
quarters, the Company's results of operations may fall below the expectations of
securities  analysts  and  investors.  In that  event,  the market  price of the
Company's Common Stock could be materially and adversely affected.

Anti-takeover  Considerations.  The  Company  has the  authority  to issue up to
3,000,000  shares of Preferred Stock of the Company in one or more series and to
fix the powers,  designations,  preferences  and relative rights thereof without
any further vote of  shareholders.  The issuance of such  Preferred  Stock could
dilute the voting powers of holders of Common Stock and could have the effect of
delaying,  deferring or  preventing a change in control of the Company.  Certain
provisions of the Company's  Articles of  Incorporation  and By-laws,  including
those providing for a staggered Board of Directors, as well as Delaware law, may
operate in a manner that could discourage or render more difficult a takeover of
the  Company  or the  removal  of  management  or may limit  the  price  certain
investors may be willing to pay for shares of Common Stock.



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