ENZON INC
10-K, 2000-09-28
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, 2000                      File Number 0-12957


                          [GRAPHIC OMITTED] 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 18, 2000 was approximately $2,696,273,000. There is no market
for the Series A Cumulative Convertible Preferred Stock, the only other class of
stock outstanding.

     As of September 18, 2000, there were 41,108,120 shares of Common Stock, par
value $.01 per share, outstanding.

     The Index to Exhibits appears on page 41.

                       Documents Incorporated by Reference

     The  registrant's  definitive  Proxy  Statement  for the Annual  Meeting of
Stockholders  scheduled  to be held on  December  5, 2000,  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.

                          2000 Form 10-K Annual Report

                                TABLE OF CONTENTS

                                                                            Page
                                                                            ----

                                     PART I
Item 1.  Business                                                              3
Item 2.  Properties                                                           22
Item 3.  Legal Proceedings                                                    22
Item 4.  Submission of Matters to a Vote of Security Holders                  22

                                     PART II

Item 5.  Market for the Registrant's Common Equity and Related
            Stockholder Matters                                               23
Item 6.  Selected Financial Data                                              24
Item 7.  Management's Discussion and Analysis of Financial                    24
            Condition and Results of Operations
Item 7a. Quantitative and Qualitative Disclosures About Market Risk           39
Item 8.  Financial Statements and Supplementary Data                          39
Item 9.  Changes in and Disagreements With Accountants on Accounting and      39
            Financial Disclosure

                                    PART III

Item 10. Directors and Executive Officers of the Registrant                   40
Item 11. Executive Compensation                                               40
Item 12. Security Ownership of Certain Beneficial Owners and Management       40
Item 13. Certain Relationships and Related Transactions                       40

                                     PART IV

Item 14. Exhibits, Financial Statement Schedules and Reports on Form 8-K      41

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


ADAGEN(R),  ONCASPAR(R) and  PROTHECAN(R) are our registered  trademarks.  Other
trademarks  and trade names used in this annual report are the property of their
respective owners.


Information   contained  in  this  Annual   Report   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 the section  entitled Risk Factors,  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.

<PAGE>


                                     PART I

Item 1. BUSINESS

Overview

     We  are  a  biopharmaceutical  company  that  develops  and  commercializes
enhanced  therapeutics for life-threatening  diseases through the application of
our two proprietary platform technologies:  PEG and single-chain antibodies.  We
apply our PEG, or  polyethylene  glycol,  technology  to improve  the  delivery,
safety and  efficacy  of proteins  and small  molecules  with known  therapeutic
efficacy. We apply our single-chain antibody, or SCA, technology to discover and
produce  antibody-like  molecules that offer many of the therapeutic benefits of
monoclonal antibodies while addressing some of their limitations.

     PEG-INTRON is a PEG-enhanced version of Schering-Plough's  alpha interferon
product,  INTRON A. We have designed  PEG-INTRON to have an improved side effect
profile, to yield greater efficacy as compared to INTRON A and to allow once per
week  dosing as  compared  to three  times per week for INTRON A. Our  worldwide
partner for PEG-INTRON, Schering-Plough, received approval in the European Union
for the treatment of adult  patients  with chronic  hepatitis C during May 2000.
Schering-Plough  has also filed an application in the United States for approval
of PEG-INTRON for the treatment of adult  patients with chronic  hepatitis C. In
February 2000, the FDA accepted  Schering-Plough's December 1999 application for
PEG-INTRON for standard review, which typically takes 12 months from the date of
its filing.  Schering-Plough  is also  conducting a Phase III clinical  trial of
PEG-INTRON  as  combination  therapy with REBETOL for  hepatitis C and Phase III
clinical trials of PEG-INTRON for the treatment of chronic myelogenous  leukemia
and malignant  melanoma.  Earlier stage clinical  trials of PEG-INTRON are being
conducted for other indications, including the treatment of HIV, hepatitis B and
multiple sclerosis.  Schering-Plough's  worldwide sales of INTRON A and REBETRON
Combination Therapy for all indications in 1999 totaled $1.1 billion.

     PROTHECAN  is a  PEG-enhanced  version of  camptothecin,  a compound in the
class of molecules called topoisomerase inhibitors.  Camptothecin has been shown
in clinical  testing to be potent against certain tumor types,  but it possesses
limited clinical utility due to significant side effects and poor solubility. We
have shown in  pre-clinical  studies  that  PROTHECAN  has reduced  side effects
compared to other  topoisomerase  inhibitors and  preferentially  accumulates in
tumors.  We have  initiated  Phase I clinical  trials of  PROTHECAN  in treating
various  types of cancers  and expect to initiate  Phase II  clinical  trials in
2001. Two  topoisomerase  inhibitors,  topotecan and  irinotecan,  are currently
approved  and  marketed for the  treatment  of ovarian and  colorectal  cancers,
respectively.   Total  1999   worldwide   sales  of  these  two  products   were
approximately $550 million. We have other PEG-enhanced product candidates, which
are currently in pre-clinical development.

     We have commercialized two products based on our PEG technology: ADAGEN for
the treatment of a congenital enzyme  deficiency  disease called Severe Combined
Immunodeficiency  Disease  or SCID  and  ONCASPAR  for the  treatment  of  acute
lymphoblastic  leukemia.  Each of these products is a PEG-enhanced  version of a
naturally  occurring  enzyme.  Both products have been on the market for several
years  and  have  demonstrated  the safe and  effective  application  of our PEG
technology.

     SCAs  are  genetically  engineered  proteins,  which  possess  the  binding
specificity and affinity of monoclonal  antibodies and are designed to expand on
the therapeutic and diagnostic applications possible with monoclonal antibodies.
Preclinical  studies have shown that SCAs allow for greater  tissue  penetration
and faster  clearance  from the body.  We intend to use our strong  intellectual
property  position for our SCAs to issue  additional  licenses to third  parties
developing  SCAs.  We also  intend  to  develop  PEG-enhanced  therapeutic  SCAs
internally,  focusing  initially on cancer and cardiovascular  therapeutics.  To
date, 11 SCAs have been or are being tested in early stage clinical trials.  The
most clinically advanced SCAs based on our technology are being developed by our
licensee,   Alexion   Pharmaceuticals,    for   complications   arising   during
cardiopulmonary  bypass and myocardial  infarction.  This product has been given
fast track review status by the FDA for bypass surgery.


                                       3
<PAGE>

     We intend  to  continue  to  commercialize  our  proprietary  products  and
technologies both internally and in cooperation with our strategic partners.  We
have  more  than  15  strategic  alliances  and  license  relationships  for the
development of products using our proprietary technologies.

PEG Technology

     Our  proprietary  PEG  technology  involves  chemically  attaching  PEG  to
therapeutic proteins or small molecules for the purpose of enhancing therapeutic
value. PEG is a relatively non-reactive and non-toxic polymer that is frequently
used in food and  pharmaceutical  products.  We have  demonstrated,  both in our
marketed products and our products under development, that for some proteins and
small molecules,  we can impart  significant  pharmacologic  advantages over the
unmodified  forms  of the  compound  by  modifying  a  compound  using  our  PEG
technology.

     These advantages include:

     o    extended circulating life,

     o    lower toxicity,

     o    increased drug stability, and

     o    enhanced drug solubility.

                               [GRAPHIC OMITTED]

                    A depiction of a PEG-enhanced molecule.

     For  many  years,  we  have  applied  our PEG  technology  to  enhance  the
pharmacologic  characteristics  of potential or existing  protein  therapeutics.
When we modify proteins with our PEG technology,  it often causes these proteins
to have properties,  such as improved  circulating  life and reduced  toxicities
that significantly improve their therapeutic performance. In some cases, PEG can
render a protein therapeutically  effective,  where the unmodified form had been
ineffective.   For  example,   proteins  are  often  limited  in  their  use  as
therapeutics because they frequently induce an immunologic response. When PEG is
attached,  it disguises  the compound and reduces  recognition  by the patient's
immune system. As a result, many of the favorable  characteristics  listed above
are achieved. Given such improvement, frequency of dosing can be reduced without
diminishing  potency,  or higher  doses can be given to achieve a more  powerful
therapeutic impact.

     We recently  developed a next  generation PEG technology  that allows us to
apply PEG to small molecules. Like proteins, many small molecules of potentially
significant  therapeutic value possess undesired  pharmacologic  characteristics
such as poor  solubility,  limited  half-life  and the  propensity  to induce an
immunologic  response.  The  attachment  of  PEG to  small  molecules  not  only
disguises the molecule,  thereby lowering potential immunogenicity and extending
its  circulatory  life,  but also  greatly  increases  the  solubility  of these
compounds.  We attach PEG to small molecules by means of a covalent bond that is
designed to


                                       4
<PAGE>

temporarily  inactivate the compound,  and then deteriorate over time, releasing
the  compound in the  proximity of targeted  tissue.  By  inactivating  and then
reactivating  the  compound  in the body we  create a Pro Drug  version  of such
compounds.  These attributes may significantly  enhance the therapeutic value of
new  chemicals,  drugs  already  marketed  by others and  off-patent  drugs with
otherwise limited utility.  We believe that this technology has broad usefulness
and that it can be applied to a wide range of small molecules, such as:

     o cancer chemotherapy agents,

     o antibiotics,

     o anti-fungals, and

     o immunosuppressants.

We also  believe that we will be able to use this PEG  technology  to impart Pro
Drug attributes to proteins and peptides, including enzymes and growth factors.

     We have significant  expertise and intellectual  property in the methods by
which PEG can be attached to a compound,  the selection of appropriate  sites on
the compound to which PEG is attached,  and the amount and type of PEG used.  If
PEG is attached to the wrong site on the protein, it can result in a loss of the
protein's activity or therapeutic effect.  Similarly,  inappropriate  linkers or
the incorrect type or amount of PEG applied to a compound will typically fail to
produce the desired outcome. Given our expertise,  we are able to tailor the PEG
technology to produce the desired  results for the  particular  substance  being
modified.

PEG Products

PEG-INTRON

     PEG-INTRON  is a  PEG-enhanced  version  of  Schering-Plough's  recombinant
alpha-interferon product called INTRON A. We have modified the INTRON A compound
by  attaching  PEG to it,  with the  goal of  imparting  upon the drug  enhanced
characteristics,  such as reduced  toxicity,  extended  circulating life and the
ability to administer higher doses without causing  additional side effects.  We
have developed PEG-INTRON in conjunction with  Schering-Plough.  Schering-Plough
currently  markets  INTRON A for 16 major  antiviral  and  oncology  indications
worldwide.  The  largest  indications  for INTRON A are  hepatitis C and certain
types  of  cancer.  Schering-Plough  has  been  conducting  clinical  trials  of
PEG-INTRON  in  hepatitis  C  and  cancer,  as  well  as  some  other  potential
indications.  During May 2000, Schering-Plough received approval in the European
Union for the  treatment  of adult  patients  with  chronic  hepatitis C and has
submitted  an  application  for  marketing  approval  in  the  U.S.  for  use of
PEG-INTRON as a stand-alone therapy in treating hepatitis C.

     In late 1998, Schering-Plough began selling INTRON A in combination therapy
with REBETOL for the treatment of hepatitis C. Schering-Plough has reported that
the  1999  worldwide  sales  of  INTRON  A,  as a  stand-alone  therapy  for all
indications and as combination  therapy with REBETOL,  were  approximately  $1.1
billion.  Sales of  INTRON  A as a  stand-alone  therapy  for the  treatment  of
hepatitis C  represent  a portion of these  combined  sales.  To date,  the only
application filed by Schering-Plough  for marketing approval of PEG-INTRON is as
a stand-alone therapy for the treatment of hepatitis C.

     Hepatitis C

     According to an article  published in the New England  Journal of Medicine,
approximately  3.9 million  people in the U.S. are infected with the hepatitis C
virus.  Approximately  2.7 million of these people are  characterized  as having
chronic  hepatitis C infection.  We believe  that the number of people  infected
with the hepatitis C virus in Europe is comparable to that in the U.S. According
to the World Health Organization,


                                       5
<PAGE>

there were  approximately 170 million chronic cases of hepatitis C worldwide.  A
substantial number of people in the U.S. who were infected with hepatitis C more
than 10 years  ago are  thought  to have  contracted  the  virus  through  blood
transfusions. Prior to 1992, the blood supply was not screened for the hepatitis
C virus. In addition, the majority of people infected with the virus are thought
to be unaware of the infection because the hepatitis C virus can incubate for up
to 10 years before  patients  become  symptomatic.  We estimate  that fewer than
100,000 patients are currently being treated in the U.S. for hepatitis C.

     The current standard of care for hepatitis C infection is  alpha-interferon
administered  three times per week for one year in combination  with  ribavirin,
another antiviral drug. The alpha-interferon plus ribavirin therapy was approved
in the U.S. for the  treatment of  hepatitis C in December  1998.  Prior to such
approval,  hepatitis C infection  was  typically  treated with  alpha-interferon
alone. In clinical studies,  alpha-interferon  stand-alone  therapy for 48 weeks
has reduced  viral loads below the  detectable  levels in 10% to 15% of patients
treated.  In clinical  studies,  alpha-interferon  plus ribavirin in combination
therapy  has  reduced  viral  loads  below  detectable  levels  in 31% to 38% of
patients  treated.  The  clinical  efficacy  of  alpha-interferon,   both  as  a
stand-alone  or combination  therapy,  has been limited by serious side effects,
which include flu-like symptoms,  gastro-intestinal disorders and depression, in
addition to undesirable dosing requirements.  The requirement of three times per
week  dosing  for  the  treatment  of  hepatitis  C  has  also  limited  patient
compliance.

     PEG-INTRON  has  shown in  clinical  trials  that it is at  least  twice as
effective and has allowed for less  frequent  dosing when compared to unmodified
INTRON A. We expect  that  PEG-INTRON  will be  administered  once per week,  as
opposed to up to three times per week for current hepatitis C regimens utilizing
unmodified INTRON A.

     In May  2000,  Schering-Plough  announced  that it had  received  Marketing
Authorization,  from  the  European  Agency  for  the  Evaluation  of  Medicinal
Products, or EMEA, for PEG-INTRON (PEG-interferon alfa-2b) Powder for Injection.
This  approval  of  PEG-INTRON  allows   Schering-Plough  to  market  PEG-INTRON
throughout the European  Union.  In December 1999,  Schering-Plough  submitted a
Biologics License Application, or BLA, to the FDA seeking marketing approval for
PEG-INTRON  Powder for  Injection  for the  treatment of chronic  hepatitis C in
patients 18 years of age or older with  compensated  liver disease.  In February
2000, the FDA accepted Schering-Plough's BLA for PEG-INTRON for standard review.
Under the  Prescription  Drug Users Fee Act,  the FDA is  required to act on the
application  within 12 months from the date of its filing on December  23, 1999.
According to  Schering-Plough,  the BLA proposes  administration  of  PEG-INTRON
Powder by injection once weekly for one year.

     Under our  licensing  agreement  with  Schering-Plough,  we are entitled to
milestone  payments and royalties on worldwide  sales of  PEG-INTRON.  The FDA's
acceptance  in  February  2000 of the BLA filing  submitted  by  Schering-Plough
entitled  us to a $1.0  million  milestone  payment.  Schering-Plough  has  been
responsible for the clinical development of PEG-INTRON.

     Schering-Plough  is also  continuing  its  development  of  PEG-INTRON as a
combination therapy with REBETOL (ribavirin, USP) for the treatment of hepatitis
C. In January 1999, Schering-Plough announced the initiation of a multi-national
Phase III clinical trial for this combination therapy.

     Cancer

     INTRON A is also used  extensively  in the  treatment of cancer.  Of the 16
indications  for which INTRON A is approved  throughout the world, 12 are cancer
indications.  Currently,  INTRON A is  approved  in the U.S.  for  three  cancer
indications and used in some cases for other indications on an off-label basis.

     Schering-Plough  is currently  conducting two Phase III clinical  trials of
PEG-INTRON  for  two  cancer   indications,   malignant   melanoma  and  chronic
myelogenous  leukemia.  In addition,  Schering-Plough  is conducting early stage
trials of PEG-INTRON  for various solid tumors and other forms of leukemia.  The
following  is a list of approved  and  potential  cancer  indications  for which
INTRON A may be prescribed in the U.S.


                                       6
<PAGE>

         Cancer Type                         Status       Annual U.S. Incidence
         -----------                         ------       ---------------------
Malignant melanoma (Stage II, III, IV)      Approved              44,200
Follicular NHL (low grade)                  Approved              11,000
Chronic myelogenous leukemia                Approved               4,300
AIDS-related Kaposi's sarcoma               Approved               3,200
Bladder cancer                              Potential             54,200
Renal cell carcinoma                        Potential             31,000

     If the  ongoing  Phase III  clinical  trials  of  PEG-INTRON  in  malignant
melanoma and chronic myelogenous  leukemia demonstrate not only that the product
is effective,  but also that it has an improved side effect profile  compared to
unmodified  INTRON A, we anticipate that higher doses of PEG-INTRON may be used,
as compared to unmodified  INTRON A. The ability to  administer  higher doses of
alpha-interferon  could lead to increased efficacy, as well as permit the use of
PEG-INTRON  for additional  indications or usage.  Published data from a Phase I
clinical  trial of PEG-INTRON in various  cancer types showed that some patients
who previously  did not respond to unmodified  INTRON A treatment did respond to
PEG-INTRON.  In that trial, PEG-INTRON was administered once per week as opposed
to up to  five  times  per  week,  which  is a  typical  therapy  regimen  using
unmodified  INTRON A, and we expect that the once per week dosing regimen may be
used in treating various cancer types.

     Potential Other Indications

     We believe  that  PEG-INTRON  may be applied in  treating  other  diseases,
including HIV, hepatitis B and multiple  sclerosis.  A Phase I clinical trial of
PEG-INTRON has been conducted for HIV. In this study, 58% of the 30 patients had
substantial reductions in their levels of HIV after adding a weekly injection of
PEG-INTRON to their combination treatments.

PROTHECAN

     PROTHECAN  is  a   PEG-enhanced   version  of  a  small   molecule   called
camptothecin,  which is an  anticancer  compound  in the  class of drugs  called
topoisomerase  inhibitors.  Camptothecin,  which was originally developed at the
National  Institutes of Health and is now off patent, is believed to be a potent
topoisomerase inhibitor.

     For many years camptothecin has been known to be a very effective oncolytic
agent  but its drug  delivery  problems  have  limited  its use.  Recently,  two
camptothecin  derivatives,  topotecan and irinotecan,  have been approved by the
FDA for the treatment of ovarian and  colorectal  cancers,  respectively.  While
these two new products are more soluble than  camptothecin,  their efficacy rate
is  relatively  low.  Despite  their  limitations,  these two products  together
achieved 1999 worldwide sales of approximately $550 million.

     We  believe  that  by  adjusting  the  way PEG is  covalently  attached  to
camptothecin,  the PEG attachment can be used to inactivate the compound's toxic
mechanism,  which allows it to circulate in the  bloodstream for long periods of
time.  This allows the compound to  accumulate  in the proximity of tumor sites.
Preliminary  animal  tests have shown that  camptothecin  modified  with our PEG
technology  preferentially  accumulates  in tumors.  The  covalent  bond used in
PROTHECAN  to attach PEG to the  camptothecin  is designed to  deteriorate  over
time,  resulting in the PEG falling off and allowing the compound  once again to
become active.

     We are  currently  conducting  Phase I  clinical  trials  of  PROTHECAN  in
treating  various  types of cancers  and expect to  commence  Phase II  clinical
trials in 2001.


                                       7
<PAGE>

ADAGEN

     ADAGEN,  our first  FDA-approved  PEG  product,  is used to treat  patients
afflicted with a type of Severe Combined Immunodeficiency Disease, or SCID, also
known as the Bubble Boy Disease,  which is caused by the chronic  deficiency  of
the adenosine  deaminase  enzyme, or ADA. ADAGEN represents the first successful
application of enzyme replacement therapy for an inherited disease. SCID results
in children being born without fully  functioning  immune systems,  leaving them
susceptible  to a  wide  range  of  infectious  diseases.  Currently,  the  only
alternative  to ADAGEN  treatment  is a  well-matched  bone  marrow  transplant.
Injections of unmodified ADA are not effective  because of its short circulating
life (less than 30 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.

     We are marketing  ADAGEN on a worldwide  basis and selling it in the United
States. A European firm is distributing  ADAGEN in Europe and Japan.  Currently,
65 patients in eight  countries are receiving  ADAGEN  therapy.  We believe many
newborns with  ADA-deficient  SCID go undiagnosed and we are therefore  focusing
our  marketing  efforts for ADAGEN on new patient  identification.  Our sales of
ADAGEN  for the  fiscal  years  ended  June 30,  2000,  1999 and 1998 were $12.2
million, $11.2 million and $10.1 million, respectively.

ONCASPAR

     ONCASPAR,  our second FDA-approved  product, is a PEG-enhanced version of a
naturally  occurring enzyme called  L-asparaginase.  It is currently approved in
the  U.S.,   Canada  and  Germany,   and  is  used  in  conjunction  with  other
chemotherapeutics  to treat patients with acute  lymphoblastic  leukemia who are
hypersensitive,  or allergic, to native, or unmodified, forms of L-asparaginase.
Aventis  Pharmaceuticals  (formerly Rhone-Poulenc Rorer Pharmaceuticals) has the
exclusive license to market ONCASPAR in the U.S. and Canada,  and MEDAC GmbH has
the exclusive right to market ONCASPAR in Europe.

     L-asparaginase is an enzyme,  which depletes the amino acid asparagine upon
which certain leukemic cells are dependent for survival.  Other companies market
unmodified L-asparaginase in the U.S. for pediatric acute lymphoblastic leukemia
and in Europe to treat  adult acute  lymphoblastic  leukemia  and  non-Hodgkin's
lymphoma, as well as pediatric acute lymphoblastic leukemia.

     The therapeutic value of unmodified  L-asparaginase is limited by its short
half-life,  which  requires  every-other-day  injections,  and its propensity to
cause a high incidence of allergic  reactions.  We believe that ONCASPAR  offers
significant therapeutic advantages over unmodified L-asparaginase.  ONCASPAR has
a  significantly   increased  half-life  in  blood,  allowing   every-other-week
administration,  and it causes fewer allergic reactions.  Based upon the current
use of unmodified L-asparaginase,  we believe that ONCASPAR may be used in other
cancer indications, potentially including lymphoma.

Other PEG Products

     Our PEG technology may be applicable to other  potential  products.  We are
currently conducting pre-clinical studies for additional PEG-enhanced compounds.
We will continue to seek opportunities to develop other  PEG-enhanced  products.
In 1998,  we  concluded a second Phase I clinical  trial for a  hemoglobin-based
oxygen carrier,  PEG-hemoglobin,  for use as a  radiosensitizer,  in conjunction
with  radiation  treatment  of solid  hypoxic  tumors.  We intend to continue to
develop  this  product  only in  conjunction  with a partner  that will fund the
development  costs.  To date, we have been unable to conclude an agreement  with
such a partner.  We do not intend to conduct  any  further  clinical  trials for
PEG-hemoglobin on our own.


                                       8
<PAGE>

SCA Proteins

General

     Antibodies  are proteins  produced by the immune  system in response to the
presence  in the body of  bacteria,  viruses or other  disease  causing  agents.
Antibodies of identical  molecular  structure that bind to a specific target are
called  monoclonal  antibodies.  Over  the past few  years,  several  monoclonal
antibodies have been approved for therapeutic use and have achieved  significant
clinical and  commercial  success.  Much of the clinical  utility of  monoclonal
antibodies  results from the affinity  and  specificity  with which they bind to
their targets,  as well as a long circulating life due to their relatively large
size. Monoclonal antibodies, however, are not well suited for use in indications
where a short  half-life is advantageous or where their large size inhibits them
physically from reaching the area of potential therapeutic activity.

     SCAs  are  genetically  engineered  proteins  designed  to  expand  on  the
therapeutic and diagnostic  applications  possible with  monoclonal  antibodies.
SCAs have the binding specificity and affinity of monoclonal  antibodies and, in
their native form, are about  one-fifth to one-sixth of the size of a monoclonal
antibody,  typically  giving them very short half lives.  We believe  that human
SCAs offer the following benefits compared to most monoclonal antibodies:

     o    faster clearance from the body,

     o    greater tissue penetration for both diagnostic imaging and therapy,

     o    a  significant  decrease in  immunogenic  problems  when compared with
          mouse-based antibodies,

     o    easier  and  more  cost  effective  scale-up  for  manufacturing  when
          compared with monoclonal antibodies,

     o    enhanced  screening  capabilities  which  allow  for  the  more  rapid
          assessment  of  SCA  proteins  of  desired   specificity   using  high
          throughput screening methods, and

     o    a better opportunity to be used orally, intranasally, transdermally or
          by inhalation.

     Comparison of a standard monoclonal antibody and a single-chain antibody.

                               [GRAPHIC OMITTED]
                              Monoclonal Antobody

                               [GRAPHIC OMITTED]
                             Single-Chain Antibody

     In addition to these  benefits,  fully human SCAs can be isolated  directly
from  human  SCA  libraries  without  the need  for  costly  and time  consuming
humanization procedures. SCAs are also readily produced


                                       9
<PAGE>

through  intracellular  expression (inside cells) allowing for their use in gene
therapy  applications  where SCA  molecules  act as specific  inhibitors of cell
function.

     We, along with numerous other academic and  industrial  laboratories,  have
demonstrated through in vitro testing the binding specificity of dozens of SCAs.
We, in collaboration with the National Cancer Institute, have shown in published
preclinical  studies that SCAs localize to specific tumors and rapidly penetrate
the tumors.

SCAs Under Development

     We believe that we have a strong  patent  position in the area of SCAs.  We
also believe that all products made by or  incorporating  SCA-based  proteins or
genes will require a license  under our patents.  We have granted  licenses to a
number of corporations and intend to issue additional  licenses.  We also intend
to develop our own SCAs,  focusing  primarily on PEG-enhanced  SCAs. To date, we
have  granted  SCA  product  licenses  to  more  than  15  companies,  including
Bristol-Myers  Squibb,  Baxter  Healthcare and the Gencell  Division of Aventis.
These  product  licenses  generally  provide  for  upfront  payments,  milestone
payments and  royalties on sales of any SCA products  developed.  The  following
table sets forth a number of our licensees  and  summarizes  their  research and
development efforts to date:

Research Collaborator               Status         Indication/Use
---------------------               ------         --------------

Alexion Pharmaceuticals             Phase IIb      Cardiopulmonary bypass
                                                   and myocardial infarction
Cell Genesys                        Phase I/II     Colon cancer
Seattle Genetics                    Phase I        Cancer
MorphoSys                           Research       Phage display
Cambridge Antibody Technology       Research       Phage display
Baxter Healthcare Corporation       Research       Cancer
Bristol-Myers Squibb                Research       All therapeutics
Gencell Division of Aventis         Research       Gene therapy

     Currently,  there are 11 SCA proteins that have been or are being tested in
early stage clinical  trials by various  organizations,  including our licensees
and academic institutions.  Some of the areas being explored are cancer therapy,
cardiovascular  indications and AIDS. We believe that those  organizations  that
have not yet  licensed  this  technology  from us will need a license from us to
commercialize these products. However, we cannot assure you that this will prove
to be the case. Set forth below are some examples of research being conducted in
the SCA area.

     Alexion Pharmaceuticals.  Our licensee,  Alexion Pharmaceuticals,  Inc., is
developing an SCA directed against  complement  protein C5, which is a component
of the body's normal defense against foreign pathogens. Inappropriate complement
activation during  cardiopulmonary  bypass and myocardial infarction can lead to
clinical problems.  In Phase I trials during  cardiopulmonary  bypass,  this SCA
improved cardiac and neurological  function and reduced blood loss.  Alexion and
its partner,  Procter & Gamble,  are currently  conducting a 1,000 patient Phase
IIb study to evaluate  this SCA in patients  undergoing  cardiopulmonary  bypass
surgery and are  initiating  two  additional  1,000  patient  Phase II trials to
evaluate  this SCA in heart  attack  patients.  This product has been given fast
track review status by the FDA for bypass surgery.

     Cell Genesys.  Another  application of our SCA technology is in the area of
T-Bodies.  T-Body  technology  involves  the  expression  of an SCA protein in a
T-Cell that has been removed from the body and genetically modified.  T-Cells, a
type of lymphocyte cell,  represent an important  component of the immune system
responsible for  cell-mediated  immunity and represent one of the body's natural
defenses  against  foreign   materials  such  as  cancer  cells  and  infectious
organisms.  Using SCA  technology,  T-Cells  can be modified  through  molecular
biology  methods to express an SCA on the cell surface  that can then  recognize
and bind to a


                                       10
<PAGE>

specific  antigen,  thereby  targeting the T-Cell to a specific  location.  Cell
Genesys,  our  licensee,  has had  success in applying  T-Bodies in  preclinical
studies with a T-Body SCA directed to various forms of cancer.  In its completed
Phase I/II trial,  Cell  Genesys  reported  that the  treatment  could be safely
administered  in an  outpatient  setting  although  no  antitumor  activity  was
observed.

     Cambridge Antibody Technology and MorphoSys.  Cambridge Antibody Technology
Ltd., or CAT, and MorphoSys are using antibody  engineering,  with phage display
library  technology,  for the  isolation of high  specificity  antibody  binding
regions. Using phage display technology,  it is possible to conveniently isolate
a fully human  high-affinity  SCA specific to virtually any target antigen.  CAT
and  MorphoSys  are  leaders  in  the  development  of  combinatorial   antibody
libraries,  using  phage  display.  CAT and  MorphoSys  currently  have  several
licensing agreements with global  pharmaceutical and biotechnology  companies to
apply their  library to the  identification  and  isolation of high  specificity
antibody proteins.  Any companies working with CAT or MorphoSys will be required
to  negotiate  a  license  with  us  for  any  SCAs  that  they  might  wish  to
commercialize.

     Seattle Genetics. Seattle Genetics is developing a single-chain immunotoxin
targeted to cancers. It is in Phase I clinical trials in patients with carcinoma
using  its  lead  product   candidate   SGN-10,   a   single-chain   version  of
Bristol-Myers' monoclonal antibody called BR 96. Preclinical data indicates that
this SCA may have potent activity against a wide variety of solid tumor cancers.
Single-chain  immunotoxins  combine an SCA that has specificity for a particular
antigen on certain  types of cancer  cells with a toxin  protein  that would not
otherwise bind to those tumor cells. SGN-10 has an SCA component that binds with
high  specificity  to a  particular  carbohydrate  that is expressed on the cell
surface  of many  forms  of  solid  tumors,  including  breast,  lung,  ovarian,
prostate, colorectal and pancreatic cancers.

     Dana-Farber  Cancer Institute and University of Alabama.  Scientists at the
Dana-Farber  Cancer  Institute  and the  University  of Alabama  are  conducting
research  utilizing  SCA  proteins  called  intrabodies.  Intrabodies  are  SCAs
produced inside the cell via gene therapy.  The Dana-Farber  Cancer Institute is
studying  the  use  of a  very  specific  intrabody  for  the  treatment  of HIV
infection.  The  University  of Alabama is  studying  a separate  intrabody  for
ovarian cancer targeted to the erbB-2 receptor. Pre-clinical data generated from
these studies have revealed that SCAs produced through intracellular  expression
can provide an important  therapeutic  response.  The  University of Alabama has
completed  a Phase I trial  and the  Dana-Farber  Cancer  Institute  expects  to
initiate its trial shortly.  Because the  Dana-Farber  Cancer  Institute and the
University of Alabama are academic research  institutions,  we have not required
them to license our technologies.

Internal Development

     Internally,  our  research  staff are  currently  working on a SCA  protein
candidate,  as well as evaluating the feasibility of  in-licensing  SCA proteins
that are already in clinical  development.  We are also  developing  several new
technology platforms, which combine our proprietary SCA and PEG technologies. We
have shown that it is possible to increase  the half life of an SCA, by a factor
of two- to twenty-fold,  by attaching PEG to it. We can modify these  properties
of a PEG-SCA by varying the size of the PEG, the amount and shape of PEG and the
attachment  site. We intend to pursue the expansion of PEG-SCA  technologies and
develop  SCA   therapeutics   that  may  be  important   in  the   treatment  of
cardiovascular  disease,  cancer,  transplantation  and acute  phases of certain
chronic diseases such as arthritis.

Strategic Alliances and Licenses

     In addition to internal  product  development,  we seek to enter into joint
development   and  licensing   arrangements   with  other   pharmaceutical   and
biopharmaceutical  companies  to expand the pipeline of products  utilizing  our
proprietary PEG and SCA protein  technologies.  We believe that our technologies
can be used to improve products that are already on the market or that are under
development to produce therapeutic products that provide a safer, more effective
and more convenient therapy.  Currently,  our partners have two products in late
stages of the approval process,  PEG-INTRON and Human Serum Albumin,  as well as
several SCA compounds in Phase I and Phase II clinical  trials.  PEG-INTRON  was
approved in the European Union in May 2000.


                                       11
<PAGE>

Schering-Plough Agreement

     In November 1990, we entered into an agreement with Schering-Plough.  Under
this agreement,  Schering-Plough agreed to apply our PEG technology to develop a
modified form of Schering-Plough's  INTRON A. Schering-Plough is responsible for
conducting and funding the clinical studies,  obtaining  regulatory approval and
marketing  the  product  worldwide  on an  exclusive  basis and we will  receive
royalties on worldwide sales of PEG-INTRON.  The royalty  percentage to which we
are   entitled   will  be   lower   in  any   country   where   a   polyethylene
glycol/interferon-a  product is being  marketed by a third party in  competition
with PEG-INTRON, where such third party is not Hoffmann-La Roche.

     In June 1999, we amended our agreement with Schering-Plough, which resulted
in an  increase in the  effective  royalty  rate that we receive for  PEG-INTRON
sales.  In  exchange,  we  relinquished  our  option  to retain  exclusive  U.S.
manufacturing rights for this product. In addition, we granted Schering-Plough a
non-exclusive  license  under some of our PEG patents  relating to Branched,  or
U-PEG, technology.  This license gives Schering-Plough the ability to sublicense
rights  under  these  patents to any party  developing  a  competing  interferon
product.

     In February 2000, we earned a $1.0 million  milestone  payment when the FDA
accepted the BLA for PEG-INTRON filed by Schering-Plough.  We are entitled to an
additional $2.0 million  milestone  payment upon the approval of the BLA, if and
when such approval occurs. Our agreement with Schering-Plough  terminates,  on a
country-by-country basis, upon the later of:

     o    the termination of Schering-Plough's obligation to pay us royalties in
          such country  under the  agreement,  which  obligation  runs until the
          later  of the  date  the  last  patent  to  contain  a claim  covering
          PEG-INTRON  expires  in  the  country  or 15  years  after  the  first
          commercial sale of PEG-INTRON in such country, or

     o    the  expiration  of the last to  expire of our  U-PEG  patents  or the
          patents  owned or assigned to us under the  agreement,  including  any
          patent  extension or other  extension of market  exclusivity  obtained
          relating to the patents.

     Schering has the right to terminate  this  agreement at any time if we fail
to maintain the requisite liability insurance.

Aventis License Agreements

     We have  entered  into a license  agreement  with  Aventis  Pharmaceuticals
(formerly Rhone-Poulenc Rorer Pharmaceutical,  Inc.), as amended, under which we
granted  Aventis an exclusive  license to sell in the United States ONCASPAR and
any other  asparaginase or  PEG-asparaginase  product developed by us or Aventis
during the term of the amended license  agreement.  During July 2000, we further
amended our license  agreement with Aventis to increase the base royalty payable
to us on net sales of  ONCASPAR  from  23.5% to 27.5% on annual  sales up to $10
million and 25% on annual sales  exceeding $10 million.  These royalty  payments
will  include  Aventis'  cost of  purchasing  ONCASPAR  from us under our supply
agreement. The term of the agreement was also extended until 2016. Additionally,
the amended license agreement eliminated the super royalty of 43.5% on net sales
of ONCASPAR which exceed certain agreed-upon  amounts.  The amended Aventis 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 royalties to us under the amended license  agreement will be
offset by an original credit of $5.9 million, which represents a royalty advance
plus  reimbursement of certain amounts due to Aventis under the original license
agreement  and  interest  expense.  The royalty  advance is shown as a long term
liability,  with the corresponding  current portion included in accrued expenses
on our consolidated balance


                                       12
<PAGE>

sheets as of June 30,  2000 and 1999.  The  royalty  advance  will be reduced as
royalties are recognized under the agreement.

     The amended  license  agreement  prohibits  Aventis from  making,  using or
selling an  asparaginase  product in the U.S.  or a  competing  PEG-asparaginase
product anywhere in the world until the later of the expiration of the agreement
or, if the agreement is terminated  earlier,  five years after termination.  The
agreement  terminates in December 2016 but  automatically  renews for additional
one-year  periods  unless  either  party  notifies  the other in writing that it
intends not to renew the agreement at least three months prior to the end of the
current term.  It can be terminated  earlier by either party due to a default by
the other. In addition, Aventis may terminate the agreement at any time upon one
year's prior notice to us or if we are unable to supply product for more than 60
days under our separate supply agreement with Aventis.  When the amended license
agreement terminates,  all rights we granted to Aventis under the agreement will
revert to us.  Under its  supply  agreement  with us,  Aventis  is  required  to
purchase from us all of its product  requirements for sales of ONCASPAR in North
America.  If we are  unable to  supply  product  to  Aventis  under  the  supply
agreement for more than 60 days for any reason other than a force majeure event,
Aventis  may  terminate  the  supply  agreement  and  we  will  be  required  to
exclusively  license Aventis the know-how  required to manufacture  ONCASPAR for
the period of time  during  which the  agreement  would have  continued  had the
license agreement not been terminated.

     During  August 2000 we made a $1.5  million  payment to Aventis,  which was
accrued for at June 30, 2000, to settle a  disagreement  over the purchase price
of ONCASPAR  under the supply  agreement  and to settle  Aventis'  claim that we
should be responsible for its lost profits while ONCASPAR is under the temporary
labeling  and  distribution   modifications  described  in  "Raw  Materials  and
Manufacturing".  Further,  beginning in May 2000 and for each month that expires
prior to our receipt of FDA  approval to allow  marketing  and  distribution  of
ONCASPAR  without  such  labeling  and  distribution,  we shall  pay to  Aventis
$100,000. As of September 15, 2000 we have not received this approval.

     Under separate  license  agreements,  Aventis has exclusive  rights to sell
ONCASPAR in Canada and Mexico.  These agreements  provide for Aventis to seek to
obtain marketing approval of ONCASPAR in Canada and Mexico and for us to receive
royalties on net sales of ONCASPAR in these countries,  if any. These agreements
expire 10 years after the first commercial sale of ONCASPAR in each country, but
automatically renew for consecutive five-year periods unless either party elects
to terminate at least three months prior to the end of the current term. Aventis
may terminate these agreements on one year's prior notice to us.

     We also have a license  agreement  with Aventis for the Pacific Rim region,
specifically,  Australia,  New Zealand,  Japan, Hong Kong, Korea, China, Taiwan,
the Philippines,  Indonesia,  Malaysia, Singapore,  Thailand, Laos, Cambodia and
Vietnam.  Under the license  agreement,  Aventis is  responsible  for  obtaining
approvals for indications in the licensed territories.  Our supply agreement for
the Pacific Rim region provides for Aventis to purchase  ONCASPAR for the region
from us at  established  prices,  which increase over the term of the agreement.
The license  agreement also provides for minimum  purchase  requirements for the
first   four   years  of  the   agreement.   These   agreements   expire   on  a
country-by-country basis 10 years after the first commercial sale of ONCASPAR in
each country,  but automatically renew for consecutive  five-year periods unless
either  party  elects to terminate at least three months prior to the end of the
current term.  Aventis may terminate these agreements on one year's prior notice
to us.

MEDAC License Agreement

     We have also granted an exclusive license to MEDAC to sell ONCASPAR and any
PEG-asparaginase  product  developed  by us or  MEDAC  during  the  term  of the
agreement in Western Europe,  Turkey and Russia. Our supply agreement with MEDAC
provides for MEDAC to purchase ONCASPAR from us at certain  established  prices,
which  increase  over the initial  five-year  term of the  agreement.  Under the
license 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,


                                       13
<PAGE>

MEDAC is required  to meet  certain  minimum  purchase  requirements.  The MEDAC
license  terminates in October 2001,  but  automatically  renews for  successive
two-year  periods  unless  either party elects to terminate at least nine months
prior to the end of the current term.  MEDAC may  terminate the agreement  after
providing us with one year's prior notice.

Green Cross Agreements

     We have two license  agreements  with the Green Cross  Corporation  for the
development  of a recombinant  human serum  albumin,  or rHSA, as a blood volume
expander. Green Cross was acquired by Yoshitomi Pharmaceutical Industries,  Ltd.
in April  1998.  Green  Cross has  reported  that it filed for  approval of this
product in Japan in November 1997. The agreements,  which were assigned to us in
connection  with our acquisition of Genex  Corporation in 1991,  entitle us 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.  A binding  arbitration was concluded in February 2000
regarding the royalty rate required under the agreements.  Green Cross had filed
documents in the arbitration  taking the position that no royalty was due to us.
We  disputed  that  position,  and the  arbitrators  awarded  us a 1% royalty on
Yoshitomi sales of rHSA in Japan, South East Asia, India, China, Australia,  New
Zealand  and North and South  America  for a period of 15 years  after the first
commercial sale of Yoshitomi's rHSA following market approval of that product in
Japan or the United States.

Marketing

     Other than ADAGEN,  which we market on a worldwide basis to a small patient
population,  we do not engage in the direct  commercial  marketing of any of our
products and therefore do not have an established  sales force.  For some of our
products,  we have provided exclusive marketing rights to our corporate partners
in return for royalties on sales.

     We expect to  evaluate  whether to create a sales  force to market  certain
products  in the  United  States or to  continue  to enter  into  licensing  and
marketing  agreements with others for United States and foreign  markets.  These
agreements  generally  provide that our  licensees or  marketing  partners  will
conduct all or a  significant  portion of the  marketing of these  products.  In
addition,  under these agreements,  our 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 our products,  we couple  activated forms of PEG with
unmodified  proteins.  We do not have a long-term  supply  agreement for the raw
polyethylene  glycol that we use to manufacture the PEG we require.  Instead, we
maintain a level of  inventory,  which we believe  should  provide us sufficient
time to find an  alternate  supplier of PEG, in the event it becomes  necessary,
without materially disrupting our business.

     During 1998, we began to experience  manufacturing problems with one of our
FDA-approved  products,  ONCASPAR.  The problems were due to increased levels of
white  particulates  in batches of  ONCASPAR,  which  resulted  in an  increased
rejection rate for this product. During November 1998, we agreed with the FDA to
temporary  labeling and distribution  modifications  for ONCASPAR and instituted
additional inspection and labeling procedures prior to distribution.  During May
1999,  the FDA  required  us to limit  distribution  of  ONCASPAR  to only those
patients who are hypersensitive to native L-asparaginase.  In November 1999, the
FDA withdrew this distribution restriction.

     In July 1999, the FDA conducted an inspection of our manufacturing facility
in connection  with our product license for ADAGEN.  Following that  inspection,
the FDA documented several deviations from Current Good Manufacturing Practices,
known as cGMP,  in a Form 483  report.  We  provided  the FDA with a  corrective
action plan. In November  1999,  the FDA issued a warning letter citing the same
cGMP deviations


                                       14
<PAGE>

listed in the July 1999 Form 483, but it also stated that the FDA was  satisfied
with our proposed  corrective  actions.  As a result of the deviations,  the FDA
decided not to approve  product  export  requests from us for ONCASPAR  until it
determines that all noted cGMP deviations have been corrected.  This restriction
was removed in August 2000.

     In January 2000, the FDA conducted another  inspection of our manufacturing
facility relating to the ONCASPAR product license and as a follow-up to the July
1999 inspection relating to ADAGEN.  Following this most recent inspection,  the
FDA issued a Form 483 report,  citing deviations from cGMP in the manufacture of
ONCASPAR and two cGMP deviations for ADAGEN. We have responded to the FDA with a
corrective action plan to the January 2000 Form 483.

Research and Development

     Our primary source of new products is our internal research and development
activities.  Research and  development  expenses for the fiscal years ended June
30, 2000, 1999 and 1998 were approximately  $8.4 million,  $6.8 million and $8.7
million, respectively.

     Our research and  development  activities  during fiscal 2000  concentrated
primarily on the Phase I clinical trial of PROTHECAN,  pre-clinical studies, and
continued research and development of our proprietary technologies.  As a result
of our clinical  trials for PROTHECAN and additional  clinical and  pre-clinical
studies, we expect our research and expenses for fiscal 2001 and beyond to be at
significantly higher levels then previous years.

Patents

     We have licensed, and been issued, a number of patents in the United States
and other  countries and have other patent  applications  pending to protect our
proprietary  technology.  Although we believe that our patents provide  adequate
protection  for the  conduct  of our  business,  we cannot  assure you that such
patents:

     o    will be of substantial protection or commercial benefit to us,

     o    will afford us adequate protection from competing products, or

     o    will not be challenged or declared invalid.

     We also cannot assure you that additional  United States patents or foreign
patent equivalents will be issued to us.

     The patent covering our original PEG technology, which we had licensed from
Research  Corporation  Technologies,  Inc.,  contained broad claims covering the
attachment of PEG to  polypeptides.  However,  this United States patent and its
corresponding  foreign  patents have expired.  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 patent,  subject
to other patents,  including those which we hold. We have obtained and intend to
continue to pursue patents with claims covering improved methods of attaching or
linking PEG to therapeutic compounds.  We also have obtained patents relating to
the specific  composition of the PEG-modified  compounds that we have identified
or  created.  We will  continue  to seek such  patents as we develop  additional
PEG-enhanced  products.  We cannot  assure  you that any of these  patents  will
enable  us  to  prevent  infringement  or  that  competitors  will  not  develop
competitive products outside the protection that may be afforded by our patents.

     We are 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.  Owners of any such patents
may seek to  prevent us or our  collaborators  from  selling  our  products.  In
January


                                       15
<PAGE>

2000,  Hoffmann-La  Roche  filed  lawsuits in both the U.S.  and France  against
Schering-Plough  alleging  that  PEG-INTRON  infringes  certain  patents held by
Hoffmann-La Roche. The validity and scope of Hoffmann-La Roche's patents in this
segment of the industry could be judicially determined during these proceedings.
If  Schering-Plough  does not prevail in this litigation,  Hoffmann-La Roche may
completely block  Schering-Plough from commercializing  PEG-INTRON.  Among other
things,  the outcome will likely  depend not only upon  whether the  Hoffmann-La
Roche patents are determined valid and infringed,  but upon the reasoning behind
such determinations. Prior to the commencement of this litigation we obtained an
opinion of patent counsel that the patent held by Hoffmann-La  Roche is invalid.
This opinion has been relied upon by us and  Schering-Plough  in  continuing  to
pursue development of this product;  however,  these opinions are not binding on
any court or the U.S. Patent and Trademark Office. We cannot assure you that the
patent  opinion  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 us or our
collaborator does not infringe such patents.

     We also believe that there are  PEG-modified  products  being  developed by
third  parties  that  infringe  on one or more  of our  current  PEG  technology
patents.  On  December  7, 1998,  we filed a patent  infringement  suit  against
Shearwater  Polymers  Inc., a company that  reportedly  has developed a Branched
PEG, or U-PEG,  used in  Hoffmann-La  Roche's  Pegasys  product,  a PEG-modified
version of its alpha-interferon product called Roferon-A. According to published
reports,  Pegasys utilizes a type of Branched PEG for which we have been granted
a patent in the U.S. and have a similar patent pending in Europe. Shearwater has
filed a counterclaim in this litigation alleging that our Branched PEG patent is
invalid and unenforceable. During September 2000 we filed a similar infringement
suit against Hoffman-LaRoche under a newly issued related patent.

     In the field of SCA  proteins,  we have 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.,  or Creative,  provoked an  interference  with this patent and on June 28,
1991,  the United States Patent and Trademark  Office entered  summary  judgment
terminating  the  interference  proceeding  and upholding  our 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, Creative signed  collaborative  agreements with us in the
field of our SCA protein technology and Creative's Biosynthetic Antibody Binding
Site 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 company 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.  We have 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 agreements also provide
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.

     The  degree  of  patent  protection  to  be  afforded  to  biotechnological
inventions is uncertain and our products are subject to this uncertainty. We are
aware of certain issued patents and patent applications,  and there may be other
patents and applications, containing subject matter which we or our licensees or
collaborators  may require in order to  research,  develop or  commercialize  at
least some of our products.  We cannot assure you that we will be able to obtain
a license to such subject matter on acceptable terms, or at all.

     In addition to the litigations described above, we expect that there may be
significant  litigation in the industry  regarding patents and other proprietary
rights  and,  to the  extent we become  involved  in such  litigation,  it could
consume a substantial  amount of our resources.  An adverse decision in any such
litigation  could subject us to significant  liabilities.  In addition,  we rely
heavily on our proprietary  technologies  for which pending patent  applications
have been filed and on unpatented know-how developed by us. Insofar as we rely


                                       16
<PAGE>

on  trade  secrets  and   unpatented   know-how  to  maintain  our   competitive
technological  position,  we cannot assure you that others may not independently
develop  the same or  similar  technologies.  Although  we have  taken  steps to
protect our trade secrets and unpatented know-how, third parties nonetheless may
gain access to such information.

Government Regulation

     The FDA and comparable regulatory agencies in state and local jurisdictions
and in  foreign  countries  impose  substantial  requirements  on  the  clinical
development,   manufacture  and  marketing  of  pharmaceutical  products.  These
agencies  and other  federal,  state and local  entities  regulate  research and
development activities and the testing,  manufacture,  quality control,  safety,
effectiveness,  labeling, storage, record keeping, approval and promotion of our
products.   All  of  our  products  will  require  regulatory   approval  before
commercialization. In particular, therapeutic products for human use are subject
to rigorous  pre-clinical  and clinical  testing and other  requirements  of the
Federal  Food,  Drug,  and  Cosmetic  Act and the  Public  Health  Service  Act,
implemented by the FDA, as well as similar statutory and regulatory requirements
of foreign  countries.  Obtaining  these  marketing  approvals and  subsequently
complying with ongoing statutory and regulatory  requirements is costly and time
consuming.  Any failure by us or our  collaborators,  licensors  or licensees to
obtain,  or any delay in  obtaining,  regulatory  approval or in complying  with
other  requirements,  could adversely affect the  commercialization  of products
that we are then  developing  and our  ability  to  receive  product  or royalty
revenues.

     The  steps  required  before  a new  drug  or  biological  product  may  be
distributed commercially in the United States generally include:

     o    conducting  appropriate  pre-clinical  laboratory  evaluations  of the
          product's chemistry,  formulation and stability, and animal studies to
          assess the potential safety and efficacy of the product,

     o    submitting  the  results  of these  evaluations  and tests to the FDA,
          along  with  manufacturing  information  and  analytical  data,  in an
          Investigational New Drug Application, or IND,

     o    making  the IND  effective  after  the  resolution  of any  safety  or
          regulatory concerns of the FDA,

     o    obtaining  approval  of  Institutional  Review  Boards,  or  IRBs,  to
          introduce  the drug or  biological  product  into  humans in  clinical
          studies,

     o    conducting  adequate and  well-controlled  human clinical  trials that
          establish  the safety and efficacy of the drug or  biological  product
          candidate  for the  intended  use,  typically in the  following  three
          sequential, or slightly overlapping stages:

               Phase  I. The  drug or  biologic  is  initially  introduced  into
               healthy  human  subjects or patients and tested for safety,  dose
               tolerance, absorption, metabolism, distribution and excretion,

               Phase II. The drug or biologic is studied in patients to identify
               possible  adverse  effects and safety  risks,  to determine  dose
               tolerance and the optimal dosage, and to collect initial efficacy
               data,

               Phase III. The drug or biologic is studied in an expanded patient
               population at multiple  clinical study sites, to confirm efficacy
               and safety at the optimized dose, by measuring a primary endpoint
               established at the outset of the study,


                                       17
<PAGE>

     o    submitting the results of preliminary research,  pre-clinical studies,
          and clinical studies as well as chemistry,  manufacturing  and control
          information on the drug or biological product to the FDA in a New Drug
          Application,  or NDA,  for a drug  product,  or BLA  for a  biological
          product, and

     o    obtaining FDA approval of the NDA or BLA prior to any commercial  sale
          or shipment of the drug or biological product.

     An  NDA or  BLA  must  contain,  among  other  things,  data  derived  from
nonclinical  laboratory and clinical studies which  demonstrate that the product
meets prescribed standards of safety, purity and potency, and a full description
of manufacturing methods. The biological product may not be marketed in the U.S.
until a biological license is issued.

     The  approval  process  can  take a  number  of years  and  often  requires
substantial financial resources. The results of pre-clinical studies and initial
clinical trials are not necessarily  predictive of the results from  large-scale
clinical trials, and clinical trials may be subject to additional costs,  delays
or  modifications  due to a number  of  factors,  including  the  difficulty  in
obtaining enough patients,  clinical  investigators,  drug supply,  or financial
support.  The FDA has issued  regulations  intended to  accelerate  the approval
process  for  the  development,  evaluation  and  marketing  of new  therapeutic
products intended to treat  life-threatening or severely debilitating  diseases,
especially where no alternative  therapies exist. If applicable,  this procedure
may shorten the traditional  product  development  process in the United States.
Similarly,  products  that  represent a  substantial  improvement  over existing
therapies may be eligible for priority review with a target lapsed approval time
of six  months.  Nonetheless,  approval  may be denied or  delayed by the FDA or
additional  trials  may be  required.  The FDA  also  may  require  testing  and
surveillance  programs to monitor the effect of approved products that have been
commercialized,  and the  agency  has the  power to  prevent  or  limit  further
marketing of a product  based on the results of these  post-marketing  programs.
Upon approval, a drug product may be marketed only in those dosage forms and for
those  indications  approved  in the  NDA or  BLA,  although  information  about
off-label indications may be distributed in certain circumstances.

     In addition to obtaining  FDA approval  for each  indication  to be treated
with each product, each domestic drug product  manufacturing  establishment must
register with the FDA, list its drug products with the FDA,  comply with Current
Good  Manufacturing  Practices  and  permit  and  pass  inspections  by the FDA.
Moreover,  the submission of  applications  for approval may require  additional
time  to  complete  manufacturing  stability  studies.   Foreign  establishments
manufacturing drug products for distribution in the United States also must list
their  products  with  the  FDA  and  comply  with  Current  Good  Manufacturing
Practices.  They also are subject to periodic  inspection by the FDA or by local
authorities under agreement with the FDA.

     Any products  manufactured  or  distributed by us pursuant to FDA approvals
are  subject  to  extensive   continuing   regulation  by  the  FDA,   including
record-keeping requirements and a requirement to report adverse experiences with
the  drug.  In  addition  to  continued   compliance  with  standard  regulatory
requirements,  the FDA also may require  post-marketing testing and surveillance
to monitor the safety and efficacy of the marketed product.  Adverse experiences
with the product must be reported to the FDA. Product approvals may be withdrawn
if compliance  with  regulatory  requirements  is not  maintained or if problems
concerning safety or efficacy of the product are discovered following approval.

     The Federal Food,  Drug,  and Cosmetic Act also mandates that drug products
be  manufactured  consistent  with  Current  Good  Manufacturing  Practices.  In
complying with the FDA's  regulations on Current Good  Manufacturing  Practices,
manufacturers  must  continue  to spend  time,  money and effort in  production,
record-keeping,  quality  control,  and  auditing  to ensure  that the  marketed
product  meets  applicable  specifications  and  other  requirements.   The  FDA
periodically inspects drug product manufacturing facilities to ensure compliance
with  Current  Good  Manufacturing  Practices.  Failure to comply  subjects  the
manufacturer to possible FDA action, such as:


                                       18
<PAGE>

     o    warning letters,

     o    suspension of manufacturing,

     o    seizure of the product,

     o    voluntary recall of a product,

     o    injunctive action, or

     o    possible civil or criminal penalties.

To the  extent  we rely on  third  parties  to  manufacture  our  compounds  and
products,  those third  parties  will be required  to comply with  Current  Good
Manufacturing Practices.

     Even after FDA  approval  has been  obtained,  and often as a condition  to
expedited approval,  further studies,  including  post-marketing studies, may be
required.  Results of  post-marketing  studies  may limit or expand the  further
marketing  of the  products.  If we propose any  modifications  to the  product,
including changes in indication,  manufacturing process,  manufacturing facility
or  labeling,  an NDA or BLA  supplement  may be required to be submitted to the
FDA.

     Products  manufactured in the United States for distribution abroad will be
subject to FDA regulations  regarding  export, as well as to the requirements of
the country to which they are shipped.  These latter  requirements are likely to
cover the conduct of clinical trials, the submission of marketing  applications,
and all aspects of product manufacture and marketing. Such requirements can vary
significantly  from country to country.  As part of our strategic  relationships
our collaborators may be responsible for the foreign regulatory approval process
of our products, although we may be legally liable for noncompliance.

     We are also  subject  to  various  federal,  state and local  laws,  rules,
regulations  and policies  relating to safe working  conditions,  laboratory and
manufacturing  practices,  the  experimental  use of  animals  and  the  use and
disposal of hazardous or potentially hazardous substances, including radioactive
compounds and infectious  disease  agents,  used in connection with our research
work.  Although we believe that our safety procedures for handling and disposing
of such  materials  comply with current  federal,  state and local laws,  rules,
regulations and policies,  the risk of accidental  injury or contamination  from
these materials cannot be entirely eliminated.

     We cannot  predict the extent of government  regulation  which might result
from future legislation or administrative  action. In this regard,  although the
Food and Drug  Administration  Modernization  Act of 1997  modified  and created
requirements  and standards under the Federal Food,  Drug, and Cosmetic Act with
the intent of facilitating  product development and marketing,  the FDA is still
in the  process  of  developing  regulations  implementing  the  Food  and  Drug
Administration  Modernization  Act of 1997.  Consequently,  the actual effect of
these developments on our business is uncertain and unpredictable.

     Moreover,  we anticipate that Congress,  state legislatures and the private
sector will continue to review and assess controls on health care spending.  Any
such proposed or actual changes could cause us or our  collaborators to limit or
eliminate  spending on  development  projects  and may  otherwise  impact us. We
cannot  predict  the  likelihood,  nature  or  extent  of  adverse  governmental
regulation that might result from future  legislative or administrative  action,
either in the  United  States or  abroad.  Additionally,  in both  domestic  and
foreign markets,  sales of our proposed  products will depend, in part, upon the
availability of reimbursement from third-party payors, such as government health
administration authorities,  managed care providers, private health insurers and
other   organizations.   Significant   uncertainty   often   exists  as  to  the
reimbursement  status of newly  approved  health  care  products.  In  addition,
third-party payors are increasingly challenging the price and cost-effectiveness
of medical  products and services.  There can be no assurance  that our proposed
products will


                                       19
<PAGE>

be considered  cost-effective or that adequate third-party reimbursement will be
available  to enable us to  maintain  price  levels  sufficient  to  realize  an
appropriate return on our investment in product research and development.

     ADAGEN was  approved by the FDA in March 1990.  PEG-INTRON  was approved in
Europe in May 2000 for  treatment of adult  patients  with chronic  hepatitis C.
ONCASPAR  was  approved  for  marketing  in the U.S.  and Germany in 1994 and in
Canada in December 1997 for patients with acute  lymphoblastic  leukemia 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 our other  products has been  approved for sale and use in humans in the
U.S. or elsewhere.

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

Competition

     Competition  in  the  biopharmaceutical   industry  is  intense  and  based
significantly on scientific and technological factors. These factors include the
availability  of patent and other  protection  of technology  and products,  the
ability to  commercialize  technological  developments and the ability to obtain
governmental approval for testing,  manufacturing and marketing. We compete with
specialized  biopharmaceutical firms in the United States, Europe and elsewhere,
as well as a growing number of large pharmaceutical  companies that are applying
biotechnology  to  their  operations.  These  companies,  as  well  as  academic
institutions,  governmental  agencies and private research  organizations,  also
compete  with  us  in  recruiting  and  retaining  highly  qualified  scientific
personnel and consultants.

     We are aware that other  companies  are  conducting  research on chemically
modified   therapeutic   proteins  and  that  certain  companies  are  modifying
pharmaceutical  products,  including  proteins,  by  attaching  PEG.  Other than
PEG-INTRON  and our  ONCASPAR  and  ADAGEN  products,  we are not  aware  of any
PEG-modified  therapeutic proteins that are currently available commercially for
therapeutic  use.  Nevertheless,  other drugs or  treatments  that are currently
available  or that may be  developed  in the  future,  and which  treat the same
diseases as those that our products are designed to treat,  may compete with our
products.

     Prior to the  development  of  ADAGEN,  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
Institutes of Health,  or 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 adenosine  deaminase,  the deficient
enzyme in people afflicted with  ADA-deficient  SCID,  permanently and at normal
levels. To date,  patients in gene therapy clinical trials have not been able to
stop ADAGEN treatment and, therefore, the trials have been inconclusive.

     Current standard  treatment of patients with acute  lymphoblastic  leukemia
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, our PEG-modified  L-asparaginase  product, is used to treat
patients with acute lymphoblastic  leukemia who are hypersensitive to unmodified
forms  of   L-asparaginase.   Currently,   there  is  one  unmodified   form  of
L-asparaginase  (Elspar) available in the United States and several available in
Europe.  We believe that ONCASPAR has two advantages over these unmodified forms
of  L-asparaginase:  increased  circulating  blood  life and  generally  reduced
immunogenicity.


                                       20
<PAGE>

     The  current  market for INTRON A,  Schering-Plough's  interferon  alpha-2b
product, is highly competitive,  with Hoffmann-La Roche, Amgen, Inc. and several
other companies  selling similar  products.  We believe that PEG-INTRON may have
several  potential  advantages  over the  interferon  products  currently on the
market, including:

     o    once per week dosing versus the current three times per week dosing,

     o    an improved side effect profile, and

     o    increased efficacy.

     It has also been reported that  Hoffmann-La  Roche's  Pegasys  product is a
longer lasting version of its interferon  product,  Roferon-A.  Hoffman-La Roche
filed for U.S.  marketing approval for Pegasys in May 2000. We believe that this
product  infringes  a patent  which  covers  one of our  second  generation  PEG
technologies,  called  Branched  PEG.  We  have  initiated  patent  infringement
litigation  against Hoffman-La Roche and the supplier of the PEG technology used
in Hoffmann-La  Roche's  Pegasys,  Shearwater  Polymers Inc., and are seeking to
block this product from entering the market in the United States.

     There  are  several   technologies  which  compete  with  our  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:

     o    those  modifying  monoclonal  antibodies  to  minimize   immunological
          reaction to a foreign  protein,  which is the strategy  employed  with
          chimerics, humanized antibodies and human monoclonal antibodies, and

     o    those creating  smaller portions of monoclonal  antibodies,  which are
          more  specific  to the target and have fewer side  effects,  as is the
          case with Fab fragments and low molecular weight peptides.

     We believe that the smaller size of our 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.  We believe  that our patent  position  on SCA  proteins  will  likely
require  companies  that have not  licensed  our SCA  protein  patents to obtain
licenses from us in order to commercialize  their products,  but there can be no
assurance that this will prove to be the case.

Employees

     As of June 30,  2000,  we employed 90 persons,  including  17 persons  with
Ph.D.  degrees.  At that  date,  45  employees  were  engaged  in  research  and
development activities, 26 were engaged in manufacturing, and 19 were engaged in
administration and management. None of our employees are covered by a collective
bargaining  agreement.  All of our  employees  are  covered  by  confidentiality
agreements. We consider our relations with our employees to be good.


                                       21
<PAGE>


Item 2. Properties

     We own no real property.  The following are all of the  facilities  that we
currently lease:

<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

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.

     We believe that our facilities are well  maintained and generally  adequate
for our present and future anticipated needs.

Item 3. Legal Proceedings

     In December 1998, we filed a patent  infringement  suit against  Shearwater
Polymers Inc., a company that has reportedly developed a Branched PEG, or U-PEG,
used in Hoffmann-La  Roche's  Pegasys  product,  a  PEG-modified  version of its
alpha-interferon  product called  Roferon-A.  We believe that Pegasys utilizes a
type of  Branched  PEG for which we have been  granted a patent in the U.S.  and
have similar patents pending in Europe, Japan and Canada. Shearwater has filed a
counter-claim  in this  litigation  alleging  that our  Branched  PEG  patent is
invalid  and   unenforceable.   During   September  2000,  we  filed  a  similar
infringement suit in Federal Court in New Jersey against  Hoffman-La Roche under
a newly issued related patent.

     In January  2000,  Hoffmann-La  Roche filed  lawsuits in both the U.S.  and
France  against  Schering-Plough  alleging  that  PEG-INTRON  infringes  certain
patents held by Hoffmann-La Roche. The validity and scope of Hoffmann-La Roche's
patents in this segment of the industry  could be judicially  determined  during
these  proceedings.  If  Schering-Plough  does not  prevail in this  litigation,
Hoffmann-La  Roche may completely  block  Schering-Plough  from  commercializing
PEG-INTRON.  Among other  things,  the outcome will likely  depend not only upon
whether  the  patents  are  determined  valid and  infringed,  but also upon the
reasoning behind such determinations.  We are presently unable to predict either
the effect or degree of effect this  litigation  will have on our  business  and
financial condition.

     There is no other pending material litigation to which we are a party or to
which any of our property is subject.

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

         None.


                                       22
<PAGE>


                                     PART II

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

     Our 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 our Common
Stock for the years  ended June 30,  2000 and 1999,  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, 2000
            First Quarter                         34.63         20.08
            Second Quarter                        46.25         26.63
            Third Quarter                         70.50         37.69
            Fourth Quarter                        47.63         25.69

           Year Ended June 30, 1999
            First Quarter                          7.13          3.97
            Second Quarter                        13.94          5.13
            Third Quarter                         16.69         13.25
            Fourth Quarter                        20.56         11.50


     As of September  18, 2000 there were 1,937  holders of record of our Common
Stock.

     We have never  declared or paid any cash  dividends on our common stock and
do not  anticipate  paying any cash  dividends  in the  foreseeable  future.  We
currently intend to retain future earnings to fund the development and growth of
our business.  Holders of our Series A preferred stock are entitled to an annual
dividend of $2.00 per share, payable semiannually, but only when and if declared
by our board of directors,  out of funds legally available.  As of June 30, 2000
there were 7,000  shares of Series A  preferred  stock  issued and  outstanding.
Dividends  on the  Series A  preferred  stock  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 our then
current  financial  condition.  No  dividends  are to be paid or set  apart  for
payment on our common stock,  nor are any shares of common stock to be redeemed,
retired or otherwise acquired for valuable  consideration unless we 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 stock.


                                       23
<PAGE>


Item 6. Selected Financial Data

     Set forth below is our  selected  financial  data for the five fiscal years
ended June 30, 2000.

Consolidated Statement of Operations Data:

<TABLE>
<CAPTION>
                                               Year Ended June 30
                       ----------------------------------------------------------------------------
                          2000              1999           1998             1997            1996
                          ----              ----           ----             ----            ----
<S>                    <C>           <C>             <C>             <C>             <C>
Revenues               17,017,797    $ 13,158,207    $ 14,644,032    $ 12,727,052    $ 12,681,281
Net Loss               (6,306,464)   $ (4,919,208)   $ (3,617,133)   $ (4,557,025)   $ (5,175,279)
Net Loss per Share          (0.17)   $      (0.14)   $      (0.12)   $      (0.16)   $      (0.20)
Dividends on
Common Stock                 None            None            None            None            None
</TABLE>


Consolidated Balance Sheet Data:
<TABLE>
<CAPTION>
                                                         June 30,
                        -------------------------------------------------------------------------

                           2000            1999            1998             1997             1996
                           ----            ----            ----             ----             ----
<S>                     <C>            <C>            <C>            <C>            <C>
Total Assets            $130,252,250   $ 34,916,315   $ 13,741,378   $ 16,005,278   $ 21,963,856
Long-Term Obligations   $         --   $         --   $         --   $         --   $      1,728
</TABLE>


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

Results of Operations

Fiscal Years Ended June 30, 2000, 1999 and 1998

Revenues.  Revenues for the year ended June 30, 2000 increased to $17,018,000 as
compared to  $13,158,000  for fiscal 1999. The components of revenues are sales,
which  consist  of our  sales  of  products  and  royalties  on the sale of such
products by others, and contract revenues. Sales increased by 21% to $15,591,000
for the year ended June 30, 2000 as compared to  $12,856,000  for the prior year
due to increased  ONCASPAR and ADAGEN sales.  ONCASPAR  sales for the year ended
June 30,  2000  increased  due to the  lifting in  November  1999 of some of the
temporary  labeling and distribution  restrictions which were placed on ONCASPAR
by the FDA as a result of certain difficulties  encountered in our manufacturing
process  discussed  below.  The  increase  was also due to an increase in ADAGEN
sales of  approximately  8%,  resulting  from an increase in patients  receiving
ADAGEN treatment. Net sales of ADAGEN, which we market, for the years ended June
30, 2000 and 1999 were  $12,159,000  and  $11,246,000,  respectively.  We market
ADAGEN  internally  and ONCASPAR  through  marketing  agreements in the U.S. and
Canada with Aventis Pharmaceuticals and in Europe with MEDAC GmbH.

     During 1998, we began to experience  manufacturing  problems with ONCASPAR.
The problems were due to an increase in the levels of particulates in batches of
ONCASPAR which resulted in an increased rejection rate for this product.  During
fiscal 1999, as a result of these manufacturing problems, we agreed with the FDA
to temporary  labeling  and  distribution  restrictions  for  ONCASPAR.  Aventis
stopped distributing ONCASPAR and we took over distribution of ONCASPAR directly
to patients on an as-needed basis. We also instituted  additional inspection and
labeling  procedures prior to distribution of the product.  In addition,  during
May 1999, the FDA required us to limit distribution of the product to only those
patients who are hypersensitive to native L-asparaginase.  In November 1999, the
FDA lifted this distribution restriction.

     We have been able to manufacture several batches of ONCASPAR, which contain
acceptable  levels of  particulates,  and have  submitted  modifications  to our
manufacturing process to the FDA. We


                                       24
<PAGE>

anticipate a final  resolution of the problem during fiscal 2001. It is expected
that Aventis will resume distribution of ONCASPAR at that time. We cannot assure
you that this  solution  will be  acceptable  to the FDA or  Aventis.  If we are
unable  to  resolve  this  problem  the FDA may not  permit  us to  continue  to
distribute ONCASPAR. An extended disruption in the marketing and distribution of
ONCASPAR may have a material adverse effect on future sales of the product.

     We expect sales of ADAGEN to increase at rates comparable to those achieved
during the last two years as additional patients are treated. We also anticipate
ONCASPAR sales will remain at reduced levels until we resolve the  manufacturing
problem and Aventis resumes normal distribution of the product. We cannot assure
you that any  particular  sales levels of ADAGEN or ONCASPAR will be achieved or
maintained.  During  June  2000,  we  began  recording  royalties  on  sales  of
PEG-INTRON by Schering-Plough.  PEG-INTRON  received marketing  authorization in
the European  Union in May 2000 and was launched in several  European  countries
during June 2000.  Launches in  additional  European  countries  are expected to
occur during the next quarter.

     During the years  ended  June 30,  2000 and 1999,  we had  export  sales of
$4,104,000 and $3,075,000,  respectively. Of these amounts, sales in Europe were
$3,584,000  and  $2,559,000  for  the  years  ended  June  30,  2000  and  1999,
respectively.

     Contract revenues for the year ended June 30, 2000 increased by $1,124,000,
as compared to the prior year. The increase in contract revenues was principally
due  to  a  $1,000,000  milestone  payment  from  our  development  partner  for
PEG-INTRON, Schering-Plough. The payment was a result of the FDA's acceptance in
January 2000 of  Schering-Plough's  U.S.  marketing  application  for the use of
PEG-INTRON in the treatment of chronic hepatitis C.

     Revenues  for the year ended June 30,  1999  decreased  to  $13,158,000  as
compared  to  $14,644,000  for the year ended June 30, 1998 due to a decrease in
contract  revenue.  Our sales  increased by 4% to $12,856,000 for the year ended
June 30, 1999 as compared to  $12,313,000  for the year ended June 30, 1998. The
increase was due to an increase in ADAGEN sales of approximately  11%, resulting
from an increase in patients  receiving ADAGEN  treatment.  Net sales of ADAGEN,
which  we  market,  were  $11,246,000  for the  year  ended  June  30,  1999 and
$10,107,000  for the year ended  June 30,  1998.  We market  our other  approved
product,  ONCASPAR,  through  marketing  agreements  in the U.S. and Canada with
Aventis  and  in  Europe  with  MEDAC.   ONCASPAR   revenues  are  comprised  of
manufacturing  revenues,  as well as  royalties on sales of ONCASPAR by Aventis.
ONCASPAR  revenues for fiscal 1999  decreased due to a decline in  manufacturing
and  royalty   revenues   resulting   from   difficulties   encountered  in  our
manufacturing process and the resulting changes in labeling and distribution.

     Contract revenue for the year ended June 30, 1999 decreased to $302,000, as
compared  to  $2,331,000  for the year ended June 30,  1998.  The  decrease  was
principally  due to the fact that we received  milestone  payments in 1998 under
our  licensing  agreement for  PEG-INTRON  with  Schering-Plough  and we did not
receive  any such  payments  in 1999.  During the year ended June 30,  1998,  we
recognized  $2,200,000 in milestone  payments we received  when  Schering-Plough
advanced PEG-INTRON into a PHASE III clinical trial.

     Cost of Sales.  Cost of sales, as a percentage of sales, for the year ended
June 30, 2000 was 31% as compared to 34% in 1999. During each of the years ended
June 30, 2000 and 1999, we recorded a charge  related to a write-off of ONCASPAR
finished  goods  on  hand.  The  write-offs  of  ONCASPAR  finished  goods  were
attributable to the manufacturing  problems previously discussed.  The write-off
recorded in the fourth  quarter of fiscal  2000  represents  certain  batches of
ONCASPAR   which  will  become   obsolete  if  the  FDA  approves  our  proposed
manufacturing  modification for ONCASPAR.  This  manufacturing  modification was
designed to correct the previously discussed ONCASPAR manufacturing problems.

     Cost of sales,  as a  percentage  of sales,  increased  to 34% for the year
ended June 30,  1999 as


                                       25
<PAGE>


compared to 30% for the year ended June 30, 1998. The increase was primarily due
to a charge taken in the first  quarter of fiscal 1999 related to a write-off of
ONCASPAR  finished goods on hand and in the  distribution  pipeline,  as well as
increased  ONCASPAR  production  costs.  The  increased  write-off  of  ONCASPAR
finished  goods  was  attributable  to  the  manufacturing  problems  previously
discussed.

     Research and  Development.  Research and development  expenses for the year
ended June 30, 2000  increased by 23% to $8,383,000 as compared to $6,836,000 in
1999.  The  increase in  research  and  development  expenses  resulted  from an
increase  in  expenses   related  to  the  clinical   development  of  PROTHECAN
(PEG-Camptothecin) and other PEG products in pre-clinical development. We expect
research  and  development  expense to  continue to  increase  significantly  as
PROTHECAN  advances to Phase II clinical  trials,  an  additional  PEG  compound
enters Phase I clinical trials and increased  pre-clinical testing on additional
products under development.

     Research  and  development  expenses  for the  year  ended  June  30,  1999
decreased by 21% to $6,836,000 from $8,654,000 for the year ended June 30, 1998.
The decrease in research and  development  expenses  resulted from a decrease in
facility  costs  resulting  from the  elimination  of a leased  facility and the
consolidation  of research and development  operations and a decline in clinical
trial costs. The decrease in clinical trial costs was a result of the completion
of a Phase Ib clinical trial for PEG-hemoglobin in 1998.

     Selling,  General  and  Administrative   Expenses.   Selling,  general  and
administrative  expenses  for the year ended June 30, 2000  increased  by 59% to
$12,956,000,  as compared to $8,133,000 in 1999. The increase in selling general
and administrative cost was principally due to a net charge to earnings recorded
in the third quarter included in selling, general and administrative expenses of
$2,600,000.  This net  charge was the  result of a  $6,000,000  payment we made,
pursuant to a binding  arbitration in a previously  disclosed lawsuit brought by
LBC Capital Resources Inc., a former financial advisor,  for fees related to our
1996  private  placement,  partially  offset by the  reversal  of certain  other
contingency  reserves.  The  increase  was also due to an increase in legal fees
associated with patent filing and defense costs.

     Selling,  general and  administrative  expenses for the year ended June 30,
1999  increased by 27% to  $8,133,000,  as compared to  $6,426,000  for the year
ended June 30, 1998.  The increase was primarily due to an increase in marketing
and  distribution  costs  for  ONCASPAR.  Due to  the  changes  in  distribution
previously discussed, we were responsible for all marketing and distribution for
this product in 1999. During the prior year, these costs were the responsibility
of Aventis.

     Other  Income/Expense.  Other  income/expense  increased by  $1,702,000  to
$2,903,000  for the year ended June 30, 2000, as compared to $1,201,000 for last
year. The increase was  attributable to an increase in interest income due to an
increase in interest bearing investments.

     Other income/expense increased by $737,000 to $1,201,000 for the year ended
June 30, 1999,  as compared to $464,000  for the year ended June 30, 1998.  This
increase  was due to an  increase  in  interest  income  due to an  increase  in
interest bearing investments.

Liquidity and Capital Resources

     Our total cash reserves,  including cash and interest bearing  investments,
as of June 30, 2000 were $118,413,000, as compared to $24,674,000 as of June 30,
1999.  The increase in total cash reserves was due to the completion of a public
offering during March 2000, in which we sold 2,300,000 shares of Common Stock at
a gross  offering  price of  $44.50  per  share  resulting  in net  proceeds  of
$95,670,000.  We invest our excess cash in a portfolio of high-grade  marketable
securities and United States government-backed securities.

     Our Aventis  License  Agreement,  as amended,  for ONCASPAR  provided for a
payment of


                                       26
<PAGE>


$3,500,000 in advance royalties which was received from Aventis in January 1995.
Royalties  due under the amended  agreement  will be offset  against an original
credit of $5,970,000, which represents the royalty advance plus reimbursement of
certain amounts due Aventis 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 to be reduced as
royalties  are  recognized  under  the  agreement.  Through  June 30,  2000,  an
aggregate of $4,313,000 in royalties  payable by Aventis has been offset against
the original credit.

     As of June 30, 2000, 1,043,000 shares of Series A Preferred Shares had been
converted  into  3,325,000  shares of Common  Stock.  Accrued  dividends  on the
converted  Series A Preferred Shares in the aggregate of $3,770,000 were settled
by the  issuance  of  235,000  shares  of  Common  Stock  and cash  payments  of
$1,947,000.  As of June 30,  2000,  there  were  accrued  and  unpaid  dividends
totaling  $144,000 on the 7,000  shares of Series A Preferred  Shares  currently
outstanding.  These  dividends are payable in cash or Common Stock at our option
and accrue on the outstanding  Series A Preferred  Shares at the rate of $14,000
per year.

     During August 2000,  we made a $1.5 million  payment to Aventis to settle a
disagreement  over the purchase price of ONCASPAR under the supply agreement and
to settle  Aventis'  claim that we should be  responsible  for its lost  profits
while ONCASPAR is under the temporary  labeling and  distribution  modifications
previously discussed.

     To date,  our sources of cash have been the  proceeds  from the sale of our
stock  through  public and private  placements,  sales and  royalties of ADAGEN,
ONCASPAR and PEG-INTRON,  sales of our products for research purposes,  contract
research and development fees,  technology transfer and license fees and royalty
advances.  Our current sources of liquidity are our cash,  cash  equivalents and
interest earned on such cash reserves,  sales and royalties of ADAGEN,  ONCASPAR
and  PEG-INTRON,  sales of our products for research  purposes and license fees.
Based upon our currently planned research and development activities and related
costs and our current  sources of  liquidity,  we  anticipate  our current  cash
reserves will be sufficient to meet our capital and operational requirements for
the foreseeable future.

     We may seek  additional  financing,  such as through  future  offerings  of
equity or debt securities or agreements with  collaborators  with respect to the
development and  commercialization  of products,  to fund future operations.  We
cannot assure you,  however,  that we will be able to obtain additional funds on
acceptable terms, if at all.

Year 2000

     In 1999, we completed a review of our business systems,  including computer
systems and manufacturing equipment, and queried our customers and vendors as to
their  progress in identifying  and  addressing  problems that their systems may
face in correctly  interrelating  and  processing  date  information in the year
2000. To date, we have not experienced any significant  problems  related to the
year 2000  problem,  either in our  systems  or the  systems  of our  vendors or
customers.

Recently Issued Accounting Standards

     In June 1998, the Financial Accounting Standards Board issued SFAS No. 133,
Accounting for Derivative  Instruments and Hedging Activities,  and subsequently
amended  by SFAS  No.  138.  This  statement  standardizes  the  accounting  for
derivative  instruments  including certain  derivative  instruments  embedded in
other  contracts.  The effective date of SFAS No. 133 was delayed to fiscal year
2001 by the issuance of SFAS No. 137. We will adopt this statement as of July 1,
2000. We have  determined  this statement will not have a material impact on our
Consolidated Financial Statements.

Risk Factors

We have a history of losses and we may never be profitable.

     We have incurred  substantial  losses since our  inception.  As of June 30,
2000, we had an accumulated  deficit of approximately $130 million. We expect to
incur operating losses for the foreseeable future. The size of these losses will
depend primarily on the receipt and timing of regulatory  approval of PEG-INTRON
and Schering-Plough's  effective marketing of PEG-INTRON, as well as on the rate
of growth in our other product sales or royalty  revenue and on the level of our
expenses.  Our two FDA-approved products are not generating significant revenues
because neither product has become widely used due to a small patient population
base and limitations on their  indicated uses. Our ability to achieve  long-term
profitability will depend upon our or


                                       27
<PAGE>


our licensees'  ability to obtain  regulatory  approvals for additional  product
candidates.  Even if our product  candidates  receive  regulatory  approval,  we
cannot  assure you that our products will achieve  market  acceptance or will be
commercialized successfully or that our operations will be profitable.

Our near term success is heavily  dependent on FDA  approval of  PEG-INTRON  and
Schering-Plough's effective marketing of PEG-INTRON.

     Under our agreement with Schering-Plough,  pursuant to which we applied our
PEG technology to develop a modified form of Schering-Plough's INTRON A, we will
receive royalties on worldwide sales of PEG-INTRON,  if any.  Schering-Plough is
responsible  for  conducting  and  funding  the  clinical   studies,   obtaining
regulatory  approval and marketing the product  worldwide on an exclusive basis.
In May  2000,  Schering-Plough  announced  that  it  had  received  a  Marketing
Authorization from the European Agency for the Evaluation of Medicinal Products,
or EMEA,  for PEG-INTRON in the European Union for the treatment of hepatitis C.
In December 1999,  Schering-Plough  completed  submission of a Biologics License
Application, or BLA, to the FDA seeking marketing approval of PEG-INTRON for the
treatment of hepatitis C.  Schering-Plough  had requested priority review status
from the FDA of this BLA. In February 2000,  the FDA accepted  Schering-Plough's
BLA for PEG-INTRON for standard review,  rather than priority  review.  Standard
review typically takes 12 months from the date of filing. We have not had access
to  Schering-Plough's  BLA,  nor  have  we been  able  to  review  the  BLA.  If
Schering-Plough  does not receive  marketing  approval  from the FDA in a timely
manner,  or at all,  it will have a  material  adverse  effect on our  business,
financial condition and results of operation.

     Schering-Plough  currently  markets  INTRON  A  together  with  REBETOL  as
combination  therapy  for  the  treatment  of  hepatitis  C  and  INTRON  A as a
stand-alone  treatment  for  hepatitis  C. If the current BLA is approved by the
FDA,  Schering-Plough will be able to market PEG-INTRON only as a stand-alone or
monotherapy treatment for hepatitis C. Schering-Plough is conducting a Phase III
clinical trial of PEG-INTRON as combination therapy with REBETOL for hepatitis C
and Phase III  clinical  trials  of  PEG-INTRON  for the  treatment  of  chronic
myelogenous  leukemia and malignant  melanoma.  If those trials are  successful,
PEG-INTRON  may be the subject of future BLAs for those  indications.  We cannot
assure you that  Schering-Plough  will seek or obtain marketing approval to sell
PEG-INTRON for these additional indications or for combination therapy. Although
Schering-Plough  is obligated  under our agreement to use commercial  efforts to
market PEG-INTRON,  we cannot assure you that Schering-Plough will be successful
in  marketing  PEG-INTRON  or that  Schering-Plough  will not continue to market
INTRON  A,  either as a  stand-alone  product  or in  combination  therapy  with
REBETOL,  even if  PEG-INTRON  receives FDA  approval.  The amount and timing of
resources  dedicated by  Schering-Plough  to the  development  and  marketing of
PEG-INTRON is not within our control. If Schering-Plough  breaches or terminates
its agreement  with us, or fails to work  diligently  toward FDA approval of the
product for additional indications, the commercialization of PEG-INTRON could be
slowed or blocked  completely.  Our  revenues  will be  negatively  affected  if
Schering-Plough  continues to market INTRON A in competition  with PEG-INTRON or
if it cannot meet the manufacturing  demands of the market.  If  Schering-Plough
does not use commercial efforts to market  PEG-INTRON,  or it otherwise breaches
the agreement, a dispute may arise between us. A dispute would be both expensive
and   time-consuming   and  may  result  in  delays  in  the   development   and
commercialization  of  PEG-INTRON,  which would  likely have a material  adverse
effect on our business, financial condition and results of operations.

There is currently  patent  litigation,  which could have a significant  adverse
impact on our business.

     Hoffmann-La  Roche  has  sued  Schering-Plough  and  claimed  that  the PEG
technology used in PEG-INTRON  infringes a patent held by Hoffmann-La Roche. The
litigation is at a very early stage, and we cannot predict its outcome. Prior to
the  commencement  of this  litigation we obtained an opinion of patent  counsel
that the patent held by Hoffmann-La Roche is invalid.  However,  this opinion is
not  binding on any court or the U.S.  Patent and  Trademark  Office.  We cannot
assure you that the  patent  opinion  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 us or our


                                       28
<PAGE>


collaborator does not infringe such patents.  If this litigation is not resolved
favorably for  Schering-Plough  and  Schering-Plough is prevented from marketing
PEG-INTRON,  we would not receive any  royalties  on sales of  PEG-INTRON.  This
would have a material  adverse effect on our business,  financial  condition and
results of operations.

     In December 1998, we filed a patent  infringement  suit against  Shearwater
Polymers, a company that has reportedly developed a Branched PEG, or U-PEG, used
in  Hoffmann-La   Roche's  Pegasys  product,  a  PEG-modified   version  of  its
alpha-interferon  product called  Roferon-A.  We believe that Pegasys utilizes a
type of  Branched  PEG,  for which we have been  granted a patent in the  United
States and have similar patents pending in Europe, Japan and Canada.  Shearwater
has filed a  counterclaim  in this  litigation  alleging  that our  Branched PEG
patent is invalid and unenforceable. In September 2000 we filed a similar patent
infringement   suit  against   Hoffman-La  Roche  in  New  Jersey  under  a  new
continuation in part patent related to our original  Branched PEG patent.  While
an adverse  outcome in this  litigation  will not prevent  Schering-Plough  from
commercializing  PEG-INTRON,  if we are not successful in our infringement suits
or if our  patent  is  held  to be  invalid,  we may  not be  able  to  preclude
Shearwater  from  selling its Branched  PEG or preclude  Hoffmann-La  Roche from
commercializing  Pegasys if it obtains regulatory approval.  If we are unable to
enforce our patent  rights in this area against  others,  it may have a material
adverse effect on our business, financial condition and results of operations.

     During the course of our litigation  proceedings  with Shearwater  Polymers
and Hoffman-La Roche and  Schering-Plough's  litigation with Hoffmann-La  Roche,
interim  information  about  the  status  of each of  these  litigations  may be
released.   Although   these   interim   releases  may  differ  from  the  final
determinations  in these  litigations,  such  information  may  have a  material
adverse effect on the market price of our common stock.

We are subject to extensive regulation. Compliance with these regulations can be
costly, time consuming and subject us to unanticipated  delays in developing our
products.

     The manufacturing  and marketing of  pharmaceutical  products in the United
States and abroad are subject to stringent governmental regulation.  The sale of
any of our  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 that apply to the clinical  testing,  manufacture and marketing
of pharmaceutical products. Obtaining FDA approval for a new therapeutic product
may take several years and involve substantial expenditures. ADAGEN was approved
by the FDA in 1990. ONCASPAR was approved in the United States and in Germany in
1994, and in Canada in 1997, in each case for patients with acute  lymphoblastic
leukemia who are hypersensitive to native forms of L-asparaginase.  ONCASPAR was
approved  in  Russia  in April  1993  for  therapeutic  use in a broad  range of
cancers.  PEG-INTRON  was approved in Europe for the treatment of hepatitis C in
May 2000.  Except  for these  approvals,  none of our  other  products  has been
approved for sale and use in humans in the United States or elsewhere.

     We cannot assure you that we or our licensees will be able to obtain FDA or
other relevant  marketing  approval for any of our other products.  In addition,
any  approved  products  are  subject  to  continuing  regulation.  If we or our
licensees fail to comply with applicable requirements it could result in:

     o    criminal penalties,

     o    civil penalties,

     o    fines,

     o    recall or seizure,

     o    injunctions requiring suspension of production,


                                       29
<PAGE>


     o    orders requiring ongoing supervision by the FDA, or

     o    refusal by the government to approve marketing or export  applications
          or to allow us to enter into supply contracts.

     If we or our licensees  fail to obtain or maintain  requisite  governmental
approvals  or fail to obtain or maintain  approvals of the scope  requested,  it
will delay or preclude us or our licensees or marketing  partners from marketing
our products.  It could also limit the commercial use of our products.  Any such
failure  or  limitation  may have a  material  adverse  effect on our  business,
financial condition and results of operations.

We  have  experienced   problems   complying  with  the  FDA's  regulations  for
manufacturing our products, and we may not be able to resolve these problems.

     Manufacturers  of drugs  also  must  comply  with the  applicable  FDA good
manufacturing  practice  regulations,  which include quality control and quality
assurance  requirements as well as the corresponding  maintenance of records and
documentation.   Manufacturing   facilities  are  subject  to  ongoing  periodic
inspection by the FDA and corresponding  state agencies,  including  unannounced
inspections, and must be licensed as part of the product approval process before
they  can be used in  commercial  manufacturing.  We or our  present  or  future
suppliers  may be  unable  to  comply  with the  applicable  good  manufacturing
practice regulations and other FDA regulatory requirements.

     During 1998, we began to experience  manufacturing problems with one of our
FDA-approved  products,  ONCASPAR.  The problems were due to increased levels of
white  particulates  in batches of  ONCASPAR,  which  resulted  in an  increased
rejection  rate for this product.  During fiscal 1999, we agreed with the FDA to
temporary  labeling and  distribution  restrictions  for ONCASPAR and instituted
additional inspection and labeling procedures prior to distribution.  During May
1999,  the FDA  required  us to limit  distribution  of  ONCASPAR  to only those
patients who are hypersensitive to native L-asparaginase.  In November 1999, the
FDA withdrew this distribution restriction.

     In July 1999, the FDA conducted an inspection of our manufacturing facility
in connection  with our product license for ADAGEN.  Following that  inspection,
the FDA documented several deviations from Current Good Manufacturing Practices,
known as cGMP,  in a Form 483  report.  We  provided  the FDA with a  corrective
action plan. In November  1999,  the FDA issued a warning letter citing the same
cGMP  deviations  listed in the July 1999 Form 483,  but it also stated that the
FDA was  satisfied  with our  proposed  corrective  actions.  As a result of the
deviations,  the FDA decided not to approve  product export requests from us for
ONCASPAR until it determines that all noted cGMP deviations have been corrected.
This restriction was removed in August 2000.

     In January 2000, the FDA conducted another  inspection of our manufacturing
facility relating to the ONCASPAR product license and as a follow-up to the July
1999 inspection relating to ADAGEN.  Following this most recent inspection,  the
FDA issued a Form 483 report,  citing deviations from cGMP in the manufacture of
ONCASPAR and two cGMP deviations for ADAGEN. We have responded to the FDA with a
corrective action plan to the January 2000 Form 483.  However,  we cannot assure
you that the FDA will not issue a warning letter with respect to the manufacture
of ONCASPAR or that the FDA will approve  product  export  requests  that we may
make in the future.

     While we expect  to  resolve  these  manufacturing  problems  by the end of
fiscal 2001,  we cannot be certain that the solution  will be  acceptable to the
FDA. If we cannot satisfactorily  resolve these problems, the FDA may not permit
us to  continue  to  distribute  ONCASPAR  or  ADAGEN.  If we cannot  market and
distribute  ONCASPAR  or ADAGEN  for an  extended  period,  future  sales of the
products may suffer, which could adversely affect our financial results.


                                       30
<PAGE>


     Schering-Plough will be responsible for the manufacture of PEG-INTRON.

Our clinical trials could take longer to complete and cost more than we expect.

     We will need to conduct clinical studies of all of our product  candidates.
These studies are costly,  time consuming and  unpredictable.  Any unanticipated
costs or delays in our  clinical  studies  could  harm our  business,  financial
condition and results of operations.

     Schering-Plough   is  conducting   clinical  trials  of  our  lead  product
candidate,  PEG-INTRON, which is in Phase III trials as combination therapy with
REBETOL for treatment of hepatitis C and as  stand-alone  therapy for two cancer
indications. We are currently conducting early stage clinical trials of our next
PEG product,  PROTHECAN.  Clinical trials can be very costly and time-consuming.
The rate of completion of clinical  trials depends upon many factors,  including
the rate of  enrollment  of  patients.  If we or  Schering-Plough  are unable to
accrue  sufficient  clinical  patients  in  our  respective  trials  during  the
appropriate period, such trials may be delayed and will likely incur significant
additional costs. In addition, FDA or institutional review boards may require us
to delay,  restrict,  or  discontinue  our clinical  trials on various  grounds,
including  a finding  that the  subjects  or  patients  are being  exposed to an
unacceptable health risk.

     The cost of human clinical trials varies  dramatically based on a number of
factors, including:

     o    the order and timing of clinical indications pursued,

     o    the  extent  of  development  and  financial  support  from  corporate
          collaborators,

     o    the number of patients required for enrollment,

     o    the  difficulty  of  obtaining   clinical   supplies  of  the  product
          candidate, and

     o    the  difficulty  in  obtaining   sufficient  patient  populations  and
          clinicians.

     All statutes and  regulations  governing the conduct of clinical trials are
subject to change in the  future,  which could  affect the cost of our  clinical
trials. Any unanticipated costs or delays in our clinical studies could harm our
business, financial condition and results of operations.

     In some cases, we rely on corporate  collaborators or academic institutions
to  conduct  some or all  aspects  of  clinical  trials  involving  our  product
candidates. We will have less control over the timing and other aspects of these
clinical  trials than if we conducted them entirely on our own. We cannot assure
you that these  trials will  commence or be  completed as we expect or that they
will be conducted successfully.

If pre-clinical and clinical trials do not yield positive results,  our products
will fail.

     If  pre-clinical  and  clinical  testing  of one  or  more  of our  product
candidates  do  not   demonstrate   the  safety  and  efficacy  of  the  desired
indications,  those potential products will fail. Numerous unforeseen events may
arise during, or as a result of, the testing process, including the following:

     o    the results of pre-clinical  studies may be inconclusive,  or they may
          not be indicative  of results that will be obtained in human  clinical
          trials,

     o    potential  products  may not  have  the  desired  effect  or may  have
          undesirable  side  effects  or  other  characteristics  that  preclude
          regulatory approval or limit their commercial use if approved,


                                       31
<PAGE>


     o    results  attained in early human clinical trials may not be indicative
          of results that are obtained in later clinical trials, and

     o    after reviewing test results,  we or our corporate  collaborators  may
          abandon  projects  which  we  might  previously  have  believed  to be
          promising.

     Clinical  testing is very  costly and can take many  years.  The failure to
adequately  demonstrate  the safety and efficacy of a therapeutic  product under
development would delay or prevent  regulatory  approval,  which could adversely
affect our business and financial performance.

     Even if we obtain  regulatory  approval for our  products,  they may not be
accepted in the marketplace.

     The commercial success of our products will depend upon their acceptance by
the  medical   community   and   third-party   payors  as   clinically   useful,
cost-effective  and safe. Even if our products obtain  regulatory  approval,  we
cannot  assure you that they will achieve  market  acceptance  of any kind.  The
degree of market acceptance will depend on many factors, including:

     o    the receipt, timing and scope of regulatory approvals,

     o    the timing of market entry in comparison with potentially  competitive
          products,

     o    the availability of third-party reimbursement, and

     o    the  establishment  and  demonstration in the medical community of the
          clinical safety,  efficacy and  cost-effectiveness of drug candidates,
          as  well  as  their   advantages   over  existing   technologies   and
          therapeutics.

     If any of our  products do not achieve  market  acceptance,  we will likely
lose our entire investment in that product.

We depend on our collaborative  partners. If we lose our collaborative  partners
or they do not apply  adequate  resources  to our  collaborations,  our  product
development and financial performance may suffer.

     We rely  heavily  and will depend  heavily in the future on  collaborations
with corporate partners,  primarily pharmaceutical companies, for one or more of
the research, development,  manufacturing, marketing and other commercialization
activities  relating  to  many  of  our  product  candidates.  If  we  lose  our
collaborative  partners,  or if  they do not  apply  adequate  resources  to our
collaborations, our product development and financial performance may suffer.

     The amount and timing of resources  dedicated by our collaborators to their
collaborations with us is not within our control.  If any collaborator  breaches
or  terminates  its  agreements  with us, or fails to conduct its  collaborative
activities in a timely manner, the  commercialization  of our product candidates
could  be  slowed  or  blocked  completely.   We  cannot  assure  you  that  our
collaborative   partners  will  not  change  their  strategic  focus  or  pursue
alternative  technologies  or  develop  alternative  products  as  a  means  for
developing treatments for the diseases targeted by these collaborative programs.
Our collaborators  could develop competing products.  In addition,  our revenues
will be affected by the effectiveness of our corporate partners in marketing any
successfully developed products.

     We cannot assure you that our collaborations  will be successful.  Disputes
may arise between us and our collaborators as to a variety of matters, including
financing  obligations  under  our  agreements  and  ownership  of  intellectual
property rights. These disputes may be both expensive and time-consuming and may
result in delays in the development and commercialization of products.


                                       32
<PAGE>


We are  dependent  upon a single  outside  supplier  for each of the crucial raw
materials  necessary  to the  manufacture  of each of our  products  and product
candidates.

     We  cannot  assure  you  that  sufficient  quantities  of our raw  material
requirements will be available to support the continued research, development or
manufacture of our products.  We purchase the unmodified  compounds  utilized in
our approved products and products under development from outside suppliers.  We
may be  required to enter into  supply  contracts  with  outside  suppliers  for
certain  unmodified  compounds.  We do  not  produce  the  unmodified  adenosine
deaminase  used  in the  manufacture  of  ADAGEN  or  the  unmodified  forms  of
L-asparaginase  used in the  manufacture of ONCASPAR.  We have a supply contract
with an outside supplier for the supply of each of these  unmodified  compounds.
If we  experience a delay in  obtaining  or are unable to obtain any  unmodified
compound, including unmodified adenosine deaminase or unmodified L-asparaginase,
on reasonable  terms, or at all, it could have a material  adverse effect on our
business, financial condition and results of operations.

     If we are required to obtain an alternate source for an unmodified compound
utilized in a product,  the FDA and relevant  foreign  regulatory  agencies will
likely  require  that we  perform  additional  testing to  demonstrate  that the
alternate  material is biologically and chemically  equivalent to the unmodified
compound  previously  used in our clinical  trials.  This testing could delay or
stop development of a product, limit commercial sales of an approved product and
cause  us to  incur  significant  additional  expenses.  If  we  are  unable  to
demonstrate   that  the  alternate   material  is  chemically  and  biologically
equivalent  to the  previously  used  unmodified  compound,  we will  likely  be
required to repeat some or all of the pre-clinical and clinical trials conducted
for the 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 that we conduct  additional
clinical trials with the alternate material.

The United States and foreign patents upon which our original PEG technology was
based have expired. We depend on patents and proprietary rights, which may offer
only limited  protection  against potential  infringement and the development by
our competitors of competitive products.

     Research  Corporation  Technologies,  Inc.  held the patent  upon which our
original  PEG  technology  was based and had  granted  us a license  under  such
patent.  Research  Corporation's  patent  contained  broad  claims  covering the
attachment of PEG to  polypeptides.  However,  this United States patent and its
corresponding  foreign  patents have expired.  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 patent,  subject
to other  patents,  including  those  which we hold.  We have  obtained  several
patents  with claims  covering  improved  methods of attaching or linking PEG to
therapeutic  compounds.  We cannot  assure  you that any of these  patents  will
enable  us  to  prevent  infringement  or  that  competitors  will  not  develop
alternative  methods of  attaching  PEG to  compounds  potentially  resulting in
competitive products outside the protection that may be afforded by our patents.
We are 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.  We cannot assure that the
expiration of the Research  Corporation  patent or other patents  related to PEG
that have been granted to third parties will not have a material  adverse effect
on our business, financial condition and results of operations.

     The  pharmaceutical  industry places  considerable  importance on obtaining
patent and trade secret protection for new technologies, products and processes.
Our success  depends,  in part,  on our ability to develop and maintain a strong
patent position for our products and technologies  both in the United States and
in other countries.  We have been licensed, and been issued, a number of patents
in the United States and other countries,  and we have other patent applications
pending to protect our  proprietary  technology.  Although  we believe  that our
patents provide certain  protection from competition,  we cannot assure you that
such patents will be of substantial protection or commercial benefit to us, will
afford us adequate protection from competing products, or will not be challenged
or declared invalid. In addition we cannot assure you that additional United


                                       33
<PAGE>


States patents or foreign patent  equivalents will be issued to us. The scope of
patent claims for  biotechnological  inventions is uncertain and our patents and
patent applications are subject to this uncertainty.

     To facilitate  development of our proprietary  technology base, we may need
to obtain licenses to patents or other proprietary rights from other parties. If
we are unable to obtain such licenses,  our product  development  efforts may be
delayed or blocked.

     We are aware that certain  organizations  are engaging in  activities  that
infringe  certain of our PEG and SCA  technology  patents.  We cannot assure you
that we will be able to  enforce  our  patent  and  other  rights  against  such
organizations.

     We expect that there will  continue  to be  significant  litigation  in the
biotechnology  and  pharmaceutical   industries   regarding  patents  and  other
proprietary  rights.  We have become involved in patent  litigation,  and we may
likely become  involved in additional  patent  litigation in the future.  We may
incur  substantial  costs in asserting any patent rights and in defending  suits
against  us  related  to  intellectual  property  rights.  Such  disputes  could
substantially delay our product development or commercialization activities, and
could have a material  adverse effect on our business,  financial  condition and
results of operations.  As discussed in "Business -- Legal  Proceedings,"  there
are three pending  litigation matters either involving or affecting our products
and  patents.  The  adverse  disposition  of  either of these  litigations  will
adversely affect our business, financial condition and results of operations.

     We also  rely on  trade  secrets,  know-how  and  continuing  technological
advancements  to  protect  our  proprietary  technology.  We have  entered  into
confidentiality  agreements  with  our  employees,   consultants,  advisors  and
collaborators.  However, these parties may not honor these agreements and we may
not be able to successfully  protect our rights to unpatented  trade secrets and
know-how.  Others may independently develop substantially equivalent proprietary
information  and  techniques  or otherwise  gain access to our trade secrets and
know-how.

We have limited sales and marketing experience,  which makes us dependent on our
marketing partners.

     Other than ADAGEN,  which we market on a worldwide basis to a small patient
population, we have not engaged in the direct commercial marketing of any of our
products and therefore we do not have significant experience in sales, marketing
or distribution.  For some of our products, we have provided exclusive marketing
rights to our corporate  partners in return for milestone payments and royalties
to be received on sales. To the extent that we enter into licensing arrangements
for the marketing and sale of our products,  any revenues we receive will depend
primarily on the efforts of these third parties.  We will not control the amount
and  timing  of  marketing  resources  that  such  third  parties  devote to our
products.  In addition, if we market products directly,  significant  additional
expenditures and management  resources would be required to increase the size of
our internal  sales force.  In any sales or marketing  effort,  we would compete
with many other  companies that currently have extensive and  well-funded  sales
operations.   Our   marketing  and  sales  efforts  may  be  unable  to  compete
successfully against other such companies.

We may need to obtain additional  financing to meet our future capital needs and
this financing may not be available when we need it.

     Our  current  development  projects  require  substantial  capital.  We may
require   substantial   additional   funds  to  conduct   research   activities,
pre-clinical  studies,  clinical  trials and other  activities  relating  to the
successful  commercialization of potential products. In addition, we may seek to
acquire additional  technologies.  We do not expect to achieve significant sales
or royalty revenue from our current FDA-approved products,  ADAGEN and ONCASPAR.
In  addition,  we cannot be sure that we will obtain  significant  revenue  from
PEG-INTRON in the near future, or ever.  Additional funds from other sources may
not be  available  on  acceptable  terms,  if at  all.  If  adequate  funds  are
unavailable from operations or additional sources of financing,


                                       34
<PAGE>


we may  have to  delay,  reduce  the  scope of or  eliminate  one or more of our
research or development programs which would materially and adversely affect our
business, financial condition and operations.

     While we believe that our cash, cash equivalents and  investments,  will be
adequate to satisfy our capital  needs for the  foreseeable  future,  our actual
capital requirements will depend on many factors, including:

     o    the level of revenues we receive  from our  FDA-approved  products and
          product candidates,

     o    continued progress of our research and development programs,

     o    our ability to establish additional collaborative arrangements,

     o    changes in our existing collaborative relationships,

     o    progress with pre-clinical studies and clinical trials,

     o    the time and costs involved in obtaining  regulatory clearance for our
          products,

     o    the costs involved in preparing, filing, prosecuting,  maintaining and
          enforcing patent claims,

     o    competing technological and market developments, and

     o    our ability to market and  distribute  our products and  establish new
          collaborative and licensing arrangements.

     We may seek to raise any necessary  additional funds through equity or debt
financings,  collaborative arrangements with corporate partners or other sources
which may be  dilutive to existing  stockholders.  We cannot  assure you that we
will be able to obtain  additional  funds on  acceptable  terms,  if at all.  If
adequate funds are not available, we may be required to:

     o    delay,  reduce the scope or eliminate  one or more of our  development
          projects,

     o    obtain  funds  through  arrangements  with  collaborative  partners or
          others  that may  require  us to  relinquish  rights to  technologies,
          product candidates or products that we would otherwise seek to develop
          or commercialize ourselves, or

     o    license  rights to  technologies,  product  candidates  or products on
          terms that are less favorable to us than might otherwise be available.

We depend on key  personnel  and may not be able to retain  these  employees  or
recruit additional qualified personnel, which would harm our business.

     Because of the specialized scientific nature of our business, we are highly
dependent upon qualified scientific,  technical and managerial personnel.  There
is intense  competition  for qualified  personnel in the  pharmaceutical  field.
Therefore,  we may not be able to attract  and retain  the  qualified  personnel
necessary  for the  development  of our  business.  The loss of the  services of
existing personnel, as well as the failure to recruit additional key scientific,
technical  and  managerial  personnel in a timely manner would harm our research
and development programs and our business.

The  failure of  computer  systems to be year 2000  compliant  could  negatively
impact our business.

     In 1999, we completed a review of our business systems,  including computer
systems and manufacturing equipment, and queried our customers and vendors as to
their  progress in identifying  and  addressing  problems that their systems may
face in correctly  interrelating  and  processing  date  information in the year
2000. To date, we have not experienced any significant  problems  related to the
year 2000  problem,  either in our  systems  or the  systems  of our  vendors or
customers.  The failure of our computer  systems to be year 2000 compliant could
negatively impact our business.


                                       35
<PAGE>


Risks Related To Our Industry

We face rapid technological change and intense competition, which could harm our
business and results of operations.

     The  biopharmaceutical  industry is  characterized  by rapid  technological
change.  Our future success will depend on our ability to maintain a competitive
position with respect to technological advances. Rapid technological development
by others may result in our products and technologies becoming obsolete.

     We  face   intense   competition   from   established   biotechnology   and
pharmaceutical companies, as well as academic and research institutions that are
pursuing  competing  technologies  and products.  We know that  competitors  are
developing or  manufacturing  various products that are used for the prevention,
diagnosis  or  treatment  of  diseases   that  we  have   targeted  for  product
development.  Many of our competitors  have  substantially  greater research and
development  capabilities and experiences and greater  manufacturing,  marketing
and financial  resources than we do.  Accordingly,  our  competitors may develop
technologies and products that are superior to those we or our collaborators are
developing   and  render  our   technologies   and  products  or  those  of  our
collaborators obsolete and noncompetitive.  In addition, many of our competitors
have much more experience than we do in pre-clinical  testing and human clinical
trials of new drugs, as well as obtaining FDA and other regulatory approval.  If
we cannot  compete  effectively,  our business and financial  performance  would
suffer.

We may be sued for product liability.

     Because  our  products  and product  candidates  are new  treatments,  with
limited, if any, past use on humans,  their use during testing or after approval
could  expose us to product  liability  claims.  We maintain  product  liability
insurance  coverage in the total amount of $10.0 million for claims arising from
the use of our products in clinical  trials prior to FDA approval and for claims
arising from the use of our products  after FDA  approval.  We cannot assure you
that we will be able to  maintain  our  existing  insurance  coverage  or obtain
coverage for the use of our other products in the future.  Also,  this insurance
coverage  and our  resources  may not be  sufficient  to satisfy  any  liability
resulting from product liability claims and a product liability claim may have a
material  adverse  effect on our  business,  financial  condition  or results of
operations.

Sales of our  products  could be  adversely  affected  if the  costs  for  these
products are not reimbursed by third-party payors.

     In recent years,  there have been  numerous  proposals to change the health
care system in the United States. Some of these proposals have included measures
that would limit or eliminate  payments for medical procedures and treatments or
subject the pricing of  pharmaceuticals  to  government  control.  In  addition,
government and private third-party payors are increasingly attempting to contain
health care costs by limiting  both the coverage and the level of  reimbursement
of  drug  products.  Consequently,  significant  uncertainty  exists  as to  the
reimbursement status of newly-approved health care products.

     Our ability to  commercialize  our products  will depend,  in part,  on the
extent  to  which  reimbursement  for  the  cost  of the  products  and  related
treatments  will  be  available  from  third-party  payors.  If we or any of our
collaborators  succeeds in bringing  one or more  products to market,  we cannot
assure you that  third-party  payors will  establish  and maintain  price levels
sufficient for realization of an appropriate return on our investment in product
development.  In addition,  lifetime limits on benefits included in most private
health plans may force patients to self-pay for treatment. For example, patients
who receive  ADAGEN are expected to require  injections  for their entire lives.
The cost of this  treatment may exceed certain plan limits and cause patients to
self-fund further treatment.  Furthermore,  inadequate  third-party coverage may
lead to reduced market  acceptance of our products.  Significant  changes in the
health  care  system in the  United  States or  elsewhere  could have a material
adverse effect on our business and financial performance.


                                       36
<PAGE>


Risks Related To Our Stock Price

The price of our common stock has been, and may continue to be, volatile.

     Historically,  the market price of our common stock has  fluctuated  over a
wide range and it is likely that the price of our common stock will fluctuate in
the future.  The market  price of our common  stock  could be impacted  due to a
variety of factors, including:

o    the  results  of  pre-clinical  testing  and  clinical  trials  by us,  our
     corporate partners or our competitors,

o    announcements of technical innovations or new products by us, our corporate
     partners or our competitors,

o    the status of corporate collaborations and supply arrangements entered into
     by us, our corporate partners or our competitors,

o    regulatory approvals of our products or those of our competitors,

o    changes in government regulation,

o    developments in the patents or other  proprietary  rights owned or licensed
     by us or our competitors,

o    public concern as to the safety and efficacy of products developed by us or
     others,

o    litigation, and

o    general market conditions in our industry.

     In  addition,  due to one or more of the  foregoing  factors in one or more
future  quarters,  our results of operations may fall below the  expectations of
securities analysts and investors. In that event, the market price of our common
stock could be materially and adversely affected.

     The  stock  market  has  recently  experienced  extreme  price  and  volume
fluctuations.  These  fluctuations have especially  affected the market price of
the  stock  of many  high  technology  and  healthcare-related  companies.  Such
fluctuations  have often been  unrelated to the operating  performance  of these
companies.  Nonetheless,  these broad market  fluctuations may negatively affect
the market price of our common stock.

Events  with  respect to our share  capital  could cause the price of our common
stock to decline.

     Sales of substantial amounts of our common stock in the open market, or the
availability of such shares for sale,  could  adversely  affect the price of our
common  stock.  As of June 30, 2000, we have  40,838,115  shares of common stock
outstanding,  excluding  shares  reserved  for  issuance  upon the  exercise  of
outstanding  stock  options and  warrants,  and the  conversion  of  outstanding
preferred  stock.  The following  securities  that may be exercised  for, or are
convertible  into,  shares of our common stock were issued and outstanding as of
June 30, 2000:

     o    Options.  Stock  options to  purchase  3,205,736  shares of our common
          stock at a weighted average exercise price of approximately  $7.35 per
          share; of this total, 2,662,958 were exercisable at a weighted average
          exercise price of $4.21 per share as of such date.

     o    Warrants.  Various  warrants to purchase  100,068 shares of our common
          stock, all of which were  exercisable,  at a weighted average exercise
          price of $5.92 per share as of such date.

     o    Series A  preferred  stock.  7,000  shares of our  Series A  preferred
          stock,  all of which were convertible into 15,909 shares of our common
          stock as of such date.

     The shares of our common  stock that may be issued  under the  warrants and
options are either currently registered with the SEC, or will be registered with
the SEC before  the shares are  purchased  by the  holders of the  warrants  and
options. The shares of common stock that may be issued upon conversion of the


                                       37
<PAGE>


Series A preferred  stock are eligible  for sale  without any volume  limitation
pursuant to Rule 144(k) under the Securities Act of 1933, as amended.

The exercise of  outstanding  registration  rights held by holders of our common
and  preferred  stock may have an  adverse  effect on the  market  price for our
common stock and may impair our ability to raise additional funds.

     As of June 30, 2000, there are demand and/or piggyback  registration rights
on an aggregate of 1,267,597  shares of our outstanding  common stock and common
stock underlying  outstanding  warrants.  We granted  Schering-Plough  piggyback
registration  rights  with  respect to 847,489  shares of our common  stock.  In
addition,  two persons  affiliated  with  Evolution  Capital have  piggyback and
demand  registration  rights  aggregating  160,239 shares with respect to common
stock and common stock  underlying  warrants to purchase our common  stock.  The
demand  rights  give these  warrant  holders a  one-time  right to require us to
register, upon their request, that number of shares underlying such warrants. We
granted the Carson Group, Inc. and two of its principals, piggyback registration
rights on a  aggregate  of  51,581  shares of  common  stock  and  common  stock
underlying warrants as consideration for finder's services that were provided to
us.  Transferees of Clearwater Fund IV were also granted piggyback  registration
rights  under  a  registration  rights  agreement  with us  with  respect  to an
aggregate  of  208,288  shares of  common  stock and  common  shares  underlying
warrants,  which are currently covered by an effective  registration  statement.
Absent any  contractual  limitations,  the holders of these rights could cause a
significant  number of shares of our common stock to be  registered  and sold in
the public market.  Such sales,  or the perception that these sales could occur,
may have an adverse  effect on the market  price for our common  stock and could
impair our ability to raise capital through an offering of equity securities.

     We originally  registered the resale of  approximately  3,983,000 shares of
our common stock owned by  stockholders  who purchased  such shares in a private
placement of our common stock that closed in July 1998.

     We originally  registered the resale of  approximately  4,122,317 shares of
our common stock owned by  stockholders  who purchased  such shares in a private
placement  of our common  stock that closed in January  and March  1996.  We are
required to maintain the effectiveness of this registration  statement until the
earlier of the date that all of the shares are sold or March 15, 2004.

     Our charter  documents  and Delaware  law may  discourage a takeover of our
company.

     Provisions of our  certificate  of  incorporation,  bylaws and Delaware law
could make it more difficult for a third party to acquire or merge with us, even
if doing so would be beneficial to our stockholders.

     Our board of directors has the authority to issue up to 3,000,000 shares of
our preferred  stock,  par value $0.01 per share, and to determine the price and
terms,  including  preferences  and  voting  rights,  of  those  shares  without
stockholder  approval.  Although  we have no current  plans to issue  additional
shares of our preferred stock, any such issuance could:

     o    have the  effect of  delaying,  deferring  or  preventing  a change in
          control of our company,

     o    discourage  bids for our  common  stock at a premium  over the  market
          price, or

     o    adversely  affect the market  price of and the voting and other rights
          of the holders of our common stock.

     In  addition,  certain  provisions  of  our  certificate  of  incorporation
establishing  a  classified  board of  directors,  and our  agreements  with our
executive officers that provide significant  payments to them following a change
in control of our company,  could each have the effect of discouraging potential
takeover attempts.


                                       38
<PAGE>


Item 7a. Quantitative and Qualitative Disclosures About Market Risk

     The  following  discussion  about our  exposure to market risk of financial
instruments  contains  forward-looking  statements.  Actual  results  may differ
materially from those described.

     Our holdings of financial instruments are comprised of debt securities, and
time  deposits.  All such  instruments  are  classified  as  securities  held to
maturity.  We do not invest in portfolio equity securities or commodities or use
financial  derivatives  for  trading  purposes.   Our  debt  security  portfolio
represents funds held temporarily pending use in our business and operations. We
manage these funds accordingly.  We seek reasonable assuredness of the safety of
principal  and market  liquidity by  investing in rated fixed income  securities
while at the same time seeking to achieve a favorable rate of return. Our market
risk exposure consists principally of exposure to changes in interest rates. Our
holdings  are also  exposed to the risks of  changes  in the  credit  quality of
issuers.  We typically invest the majority of our investments in the shorter-end
of the  maturity  spectrum,  and at June 30,  2000 all of our  holdings  were in
instruments maturing in two and a half years or less.

     The table below presents the principal amounts and related weighted average
interest rates by year of maturity for our  investment  portfolio as of June 30,
2000.

<TABLE>
<CAPTION>
                                  2001             2002          2003          Total        Fair Value
                             --------------    -----------    -----------   ------------   ------------
     <S>                     <C>               <C>            <C>            <C>            <C>
     Fixed Rate              $   35,668,000    $54,487,000             --    $90,155,000    $90,096,000
     Average Interest Rate             6.29%          6.69%            --           6.41%            --
     Variable Rate                       --      4,997,000     10,008,000     15,005,000     15,081,000
     Average Interest Rate               --           6.37%          6.44%          6.56%            --
                             --------------    -----------    -----------   ------------   ------------
                             $   35,668,000    $59,484,000    $10,008,000   $105,160,000   $105,177,000
                             ==============    ===========    ===========   ============   ============

</TABLE>


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.


                                       39
<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  Proxy  Statement  for our  Annual  Meeting  of
Stockholders scheduled to be held on December 5, 2000.


                                       40
<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
        Number     Description                                                                By Reference
        ------     -----------                                                                -------------
<S>                 <C>                                                                         <C>
          3(i)      Certificate of Incorporation as amended                                             ~~
         3(ii)      By laws, as amended                                                             *(4.2)
         3(iv)      Amendment to Certificate of Incorporation dated January 5, 1998                ##3(iv)
          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
                    August 10, 2000                                                                     @
         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)
         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)
</TABLE>


                                       41
<PAGE>

<TABLE>
<CAPTION>
<S>                 <C>                                                                         <C>
         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.                                                          ^^^^(10.28)
         10.29      Underwriting Agreement dated March 20,2000 with Morgan
                    Stanley & Co. Inc., CIBC World Markets Corp., and SG
                    Cowen Securities Corporation                                                  /(10.29)
          21.0      Subsidiaries of Registrant                                                          @
          23.0      Consent of KPMG LLP                                                                 @
          27.0      Financial Data Schedule                                                             @
</TABLE>

         @  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  Quarterly Report on
            Form 10-Q for the quarter ended  December 31, 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, 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.


                                       42
<PAGE>

         ~  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.

      ^^^^  Previously  filed as an exhibit to the  Company's  Annual  Report on
            Form 10-K for the year ended June 30, 1998 and  incorporated  herein
            by reference thereto.

         /  Previously  filed  as  an  exhibit  to  the  Company's  Registration
            Statement on Form S-3 (File No. 333-30818) filed with the Commission
            and incorporated herein by reference thereto.


(b)      Reports on Form 8-K.

     On June 7, 2000, we filed with the  Commission a Current Report on Form 8-K
dated May 30, 2000,  related to the European Union's  Commission of the European
Communities granting Schering-Plough  marketing authorization to PEG-INTRON as a
once-weekly monotherapy for adult patients with chronic hepatitis C.

     On May 12, 2000, we filed with the  Commission a Current Report on Form 8-K
dated May 1,  2000,  related  to  Schering-Plough's  results  of a Phase II dose
ranging study of PEG-INTRON(TM) combined with Ribavirin.

     On April 19, 2000,  we filed with the  Commission a Current  Report on Form
8-K dated  April 18,  2000,  related to the results  from a Phase III  clinical
trial  comparing  the  safety  and  efficacy  of  PEG-INTRON(TM)  Injection  and
INTRON(R) A Injection, as monotherapy for the treatment of hepatitis C.


                                       43
<PAGE>


                                   ENZON, INC.


Dated: September 28, 2000                         by:  /S/ Peter G. Tombros
                                                       ----------------------
                                                       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:


      Name                            Title                         Date
      ----                            -----                         ----
/S/ Peter G. Tombros       President, Chief Executive       September 28, 2000
------------------------   Officer and Director
Peter G. Tombros           (Principal Executive Officer)


/S/ Kenneth J. Zuerblis    Vice President, Finance,         September 28, 2000
------------------------   Chief Financial Officer and
Kenneth J. Zuerblis        Corporate Secretary
                           (Principal Financial and
                           Accounting Officer)


/S/ Randy H. Thurman       Chairman of the Board            September 28, 2000
-----------------------
Randy H. Thurman

                           Director
-----------------------
David S. Barlow

/S/ Rolf A. Classon        Director                         September 28, 2000
-----------------------
Rolf A. Classon

/S/ Rosina B. Dixon        Director                         September 28, 2000
-----------------------
Rosina B. Dixon

/S/ David W. Golde         Director
-----------------------
David W. Golde

/S/ Robert LeBuhn          Director                         September 28, 2000
-----------------------
Robert LeBuhn

/S/ A.M. "Don" MacKinnon   Director                         September 28, 2000
-----------------------
A.M. "Don" MacKinnon

<PAGE>



                          ENZON, INC. AND SUBSIDIARIES



                                      Index

                                                                            Page
                                                                            ----

Independent Auditors' Report                                                 F-2

Consolidated Financial Statements:
  Consolidated  Balance Sheets - June 30, 2000 and 1999                      F-3
  Consolidated Statements of Operations - Years ended
   June 30, 2000, 1999 and 1998                                              F-4
  Consolidated Statements of Stockholders' Equity -
   Years ended June 30, 2000, 1999 and 1998                                  F-5
  Consolidated  Statements of Cash Flows - Years ended
   June 30, 2000, 1999 and 1998                                              F-7
  Notes to Consolidated Financial Statements - Years
   ended June 30, 2000, 1999 and 1998                                        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 auditing standards generally accepted
in the  United  States of  America.  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, 2000 and 1999, and the results of their  operations
and their cash flows for each of the years in the  three-year  period ended June
30, 2000, in conformity with  accounting  principles  generally  accepted in the
United States of America.




KPMG LLP



Short Hills, New Jersey
September 5, 2000









                                       F-2


<PAGE>




                          ENZON, INC. AND SUBSIDIARIES
                           CONSOLIDATED BALANCE SHEETS
                             June 30, 2000 and 1999

<TABLE>
<CAPTION>
ASSETS                                                               2000             1999
                                                                -------------    -------------

<S>                                                             <C>              <C>
Current assets:
 Cash and cash equivalents                                      $  31,935,410    $  24,673,636
 Short-term investments                                            16,986,278               --
 Accounts receivable                                                5,442,455        4,604,847
 Inventories                                                          946,717        1,326,601
 Prepaid expenses and other current assets                          2,269,884        1,034,327
                                                                -------------    -------------

   Total current assets                                            57,580,744       31,639,411
                                                                -------------    -------------
Property and equipment                                             12,439,729       12,054,505
 Less accumulated depreciation and amortization                    10,650,859       10,649,661
                                                                -------------    -------------
                                                                    1,788,870        1,404,844
                                                                -------------    -------------
Other assets:
 Investments                                                       69,557,482           68,823
 Deposits and deferred charges                                        426,731          753,683
 Patents, net                                                         898,423        1,049,554
                                                                -------------    -------------
                                                                   70,882,636        1,872,060
                                                                -------------    -------------
   Total assets                                                 $ 130,252,250    $  34,916,315
                                                                =============    =============



LIABILITIES AND STOCKHOLDERS' EQUITY

Current liabilities:
 Accounts payable                                               $   2,465,360    $   1,716,089
 Accrued expenses                                                   5,706,811        6,261,640
                                                                -------------    -------------
   Total current liabilities                                        8,172,171        7,977,729
                                                                -------------    -------------
Accrued rent                                                          607,914          634,390
Royalty advance - Aventis                                             510,001          728,977
                                                                -------------    -------------
                                                                    1,117,915        1,363,367
                                                                -------------    -------------
Commitments and contingencies
Stockholders' equity:
 Preferred stock-$.01 par value, authorized 3,000,000 shares;
  issued and outstanding 7,000 shares in 2000 and 107,000
  shares in 1999
  (liquidation preference aggregating $319,000 in 2000 and
    $4,659,000 in 1999)                                                    70            1,070
 Common stock-$.01 par value, authorized 60,000,000 shares;
  issued and outstanding 40,838,115 shares in 2000 and
  36,488,684 shares in 1999                                           408,381          364,886
 Additional paid-in capital                                        50,567,774      146,970,289
 Accumulated deficit                                             (130,014,061)    (121,761,026)
                                                                -------------    -------------
   Total stockholders' equity                                     120,962,164       25,575,219
                                                                -------------    -------------
   Total liabilities and stockholders' equity                   $ 130,252,250    $  34,916,315
                                                                =============    =============
</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, 2000, 1999 and 1998

<TABLE>
<CAPTION>

                                                    2000            1999            1998
                                                ------------    ------------    ------------
<S>                                             <C>             <C>             <C>
Revenues:
 Sales                                          $ 15,591,488    $ 12,855,995    $ 12,312,730
 Contract revenue                                  1,426,309         302,212       2,331,302
                                                ------------    ------------    ------------
   Total revenues                                 17,017,797      13,158,207      14,644,032
                                                ------------    ------------    ------------
Costs and expenses:
 Cost of sales                                     4,888,357       4,309,956       3,645,281
 Research and development expenses                 8,382,772       6,835,521       8,653,567
 Selling, general and administrative expenses     12,956,118       8,133,366       6,426,241
                                                ------------    ------------    ------------
   Total costs and expenses                       26,227,247      19,278,843      18,725,089
                                                ------------    ------------    ------------
    Operating loss                                (9,209,450)     (6,120,636)     (4,081,057)
                                                ------------    ------------    ------------
Other income (expense):
 Interest and dividend income                      2,943,311       1,145,009         460,922
 Interest expense                                     (4,051)         (8,348)        (13,923)
 Other                                               (36,274)         64,767          16,925
                                                ------------    ------------    ------------

                                                   2,902,986       1,201,428         463,924
                                                ------------    ------------    ------------

   Net loss                                     ($ 6,306,464)   ($ 4,919,208)   ($ 3,617,133)
                                                ============    ============    ============
Basic and diluted net loss per common share          ($ 0.17)        ($ 0.14)        ($ 0.12)
                                                ============    ============    ============
Weighted average number of common
 shares outstanding                               38,172,515      35,699,133      31,092,369
                                                ============    ============    ============
</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, 2000, 1999 and 1998

<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, 1997                                        109,000          $1,090                    30,797,735       $307,977
  Common stock issued for exercise at
   non-qualified stock options                        --          --              --            2.23       505,072          5,051
  Common stock issued on conversion of
   Series A Preferred Stock                        25.00      (2,000)            (20)          11.00         4,544             45
  Dividends issued on Series A Preferred Stock        --          --              --           11.00         2,848             29
  Common stock issued for Independent
  Directors' Stock Plan                               --          --              --            4.11        16,904            169
  Common stock issued for consulting services         --          --              --            4.77        14,250            143
  Consulting expense for issuance of stock
   options                                            --          --              --              --            --             --
   Net Loss                                           --          --              --              --            --             --
                                                           ---------      ----------                  ------------    ------------
Balance, June 30, 1998                                       107,000          $1,070                    31,341,353        $313,414

 Common stock issued for exercise of
  non-qualified stock options                         --          --              --            4.40     1,000,919         10,009
 Common stock issued on exercise of
 Common stock warrants                                --          --              --            2.50       150,000          1,500
 Net proceeds from Private Placement,
  July 1998                                           --          --              --            4.75     3,983,000         39,830
 Common stock issued for Independent
  Directors' Stock Plan                               --          --              --            8.88         8,514             84
 Common stock options and warrants issued
  for consulting services                             --          --              --              --            --             --
 Common stock issued for consulting services          --          --              --            6.13         4,898             49
 Net loss                                             --          --              --              --            --             --
                                                           ---------      ----------                  ------------   ------------
Balance, June 30, 1999, carried forward                      107,000          $1,070                    36,488,684       $364,886

<CAPTION>

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

 Common stock issued for exercise of
  non-qualified stock options                        4,396,477               --       4,406,486
 Common stock issued on exercise of
 Common stock warrants                                 373,500               --         375,000
 Net proceeds from Private Placement,
  July 1998                                         17,510,265               --      17,550,095
 Common stock issued for Independent
  Directors' Stock Plan                                 75,539               --          75,623
 Common stock options and warrants issued
  for consulting services                            1,130,683               --       1,130,683
 Common stock issued for consulting services            29,951               --          30,000
 Net loss                                                   --       (4,919,208)     (4,919,208)
                                                 -------------    -------------    ------------
Balance, June 30, 1999, carried forward           $146,970,289    ($121,761,026)    $25,575,219
</TABLE>

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

                                      F-5


<PAGE>


                          ENZON, INC. AND SUBSIDIARIES
           CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (continued)
                    Years ended June 30, 2000, 1999 and 1998

<TABLE>
<CAPTION>
                                                       Preferred  stock                     Common stock
                                                       ----------------          --------------------------------      Additional
                                                   Amount  Number of    Par       Amount      Number of      Par         paid-in
                                                 per share   Shares    Value     per share      Shares      Value        capital
                                                 ---------   ------    -----     ---------      ------      -----        -------
<S>                                               <C>      <C>        <C>         <C>       <C>            <C>        <C>
Balance, June 30, 1999, brought forward                    107,000    $ 1,070               36,488,684     $364,886   $ 146,970,289
Common stock issued for exercise of
 non-qualified stock options                       --           --         --      4.25        807,181        8,072       3,286,246
Common stock issued on conversion of
 Series A Preferred Stock                         25.00   (100,000)    (1,000)    11.00        227,271        2,273          (1,273)
Dividends issued on Series A Preferred Stock       --           --         --        --             --           --              --
Common stock issued on exercise of
 common stock warrants                             --           --         --      4.57      1,012,116       10,121       4,395,803
Net Proceeds from Common stock offering                                           44.50      2,300,000       23,000      95,647,262
Common stock issued for Independent
 Directors' Stock Plan                             --           --         --     30.82          2,863           29          88,208
Consulting expense for issuance for stock
options                                            --           --         --        --             --           --         181,239
Net loss                                           --           --         --        --             --           --              --
                                                          --------    -------               ----------     --------   -------------

Balance, June 30, 2000                                       7,000    $    70               40,838,115     $408,381   $ 250,567,774
                                                          ========    =======               ==========     ========   =============

<CAPTION>

                                                   Accumulated
                                                     Deficit            Total
                                                     -------            -----
<S>                                               <C>              <C>
Balance, June 30, 1999, brought forward            ($121,761,026)   $  25,575,219
Common stock issued for exercise of
 non-qualified stock options                                  --        3,294,318
Common stock issued on conversion of
 Series A Preferred Stock                                     --               --
Dividends issued on Series A Preferred Stock          (1,946,571)      (1,946,571)
Common stock issued on exercise of
 common stock warrants                                        --        4,405,924
Net Proceeds from Common stock offering                       --       95,670,262
Common stock issued for Independent
 Directors' Stock Plan                                        --           88,237
Consulting expense for issuance for stock
options                                                       --          181,239
Net loss                                              (6,306,464)      (6,306,464)
                                                   -------------    -------------

Balance, June 30, 2000                             ($130,014,061)   $ 120,962,164
                                                   =============    =============
</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, 2000, 1999 and 1998

<TABLE>
<CAPTION>

                                                       2000             1999            1998
                                                   -------------    ------------    -----------
<S>                                                <C>              <C>             <C>
Cash flows from operating activities:
Net loss                                           ($  6,306,464)   ($ 4,919,208)   ($3,617,133)
Adjustments to reconcile net loss to net cash
 used in operating activities:
   Depreciation and amortization                         499,245         835,503      1,217,423
   Loss (gain) on retirement of assets                    36,274         (38,521)        97,037
Non-cash expense for issuance of common
   stock, warrants, and options                          269,476       1,236,306        343,212
   Changes in assets and liabilities:
(Increase) decrease  in accounts receivable             (837,608)     (2,304,801)       133,716
Decrease (increase) in inventories                       379,884        (304,071)      (162,657)
Increase in prepaid expenses and other
       current assets                                 (1,232,483)       (586,375)      (360,220)
Decrease (increase) in deposits and deferred
     charges                                             326,952        (288,936)      (430,172)
(Decrease) increase in accounts payable                  749,271           4,233       (198,881)
Increase (decrease) in accrued expenses                 (473,442)      2,691,353        796,403
Decrease in accrued rent                                 (26,476)        (92,770)      (142,852)
Decrease in royalty advance - Aventis                   (300,363)        (76,558)    (1,101,501)
                                                   -------------    ------------    -----------
       Net cash used in operating activities          (6,915,734)     (3,843,845)    (3,425,625)
                                                   -------------    ------------    -----------

Cash flows from investing activities:
Capital expenditures                                    (768,415)       (424,670)      (160,940)
Proceeds from sale of equipment                             --           131,932         83,129
 Purchase of investments                             (90,478,010)           --             --
 Maturities of investments                             4,000,000            --             --
 Decrease in long-term investments                          --               179          9,291
                                                   -------------    ------------    -----------

       Net cash used in investing activities         (87,246,425)       (292,559)       (68,520)
                                                   -------------    ------------    -----------

Cash flows from financing activities:
Proceeds from issuance of common stock and
     warrants                                        103,370,504      22,331,581      1,658,580
Preferred stock dividends paid                        (1,946,571)           --             --
Principal payments of obligations under
     capital lease                                          --              --           (1,728)
                                                   -------------    ------------    -----------
       Net cash provided by financing activities     101,423,933      22,331,581      1,656,852
                                                   -------------    ------------    -----------
       Net increase (decrease) in cash and cash
         equivalents                                   7,261,774      18,195,177     (1,837,293)
 Cash and cash equivalents at beginning of year       24,673,636       6,478,459      8,315,752
                                                   -------------    ------------    -----------

 Cash and cash equivalents at end of year          $  31,935,410    $ 24,673,636    $ 6,478,459
                                                   =============    ============    ===========

</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, 2000, 1999 and 1998


(1)  Company Overview

          Enzon, Inc. ("Enzon" or "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),  and
     ONCASPAR(R),  royalties on sales of  PEG-INTRON,  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.  PEG-INTRON  is  approved  for
     marketing in the European Union.

(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 are 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

          The Company  classifies its debt and marketable equity securities into
     held-to-maturity  or  available-for-sale  categories.  Debt  securities are
     classified as held-to-maturity  when the Company has the intent and ability
     to hold the securities to maturity.  Debt  securities for which the Company
     does not have the intent or ability to hold to maturity are  classified  as
     available  for sale.  Held-to-maturity  securities  are  recorded as either
     short-term or long-term on the balance sheet based on contractual  maturity
     date  and  are  stated  at  amortized  cost.  Debt  and  marketable  equity
     securities   not   classified  as   held-to-maturity   are   classified  as
     available-for-sale   and  are  carried  at  fair  market  value,  with  the
     unrealized gains and losses,  net of tax,  included in the determination of
     comprehensive income and reported in stockholders' equity.

          The fair value of substantially all securities is determined by quoted
     market  prices.  The estimated fair value of securities for which there are
     no quoted market  prices is based on similar  types of securities  that are
     traded in the market.  Gains or losses on securities  sold are based on the
     specific identification method.

     The amortized cost and fair value for securities  held to maturity by major
     security type at June 30, 2000 and 1999, were as follows:

<TABLE>
<CAPTION>
                                          June 30, 2000                June 30, 1999
                                          -------------                -------------
                                   Amortized      Fair Market    Amortized      Fair Market
                                      Cost           Value          Cost           Value
<S>                              <C>            <C>             <C>             <C>
     U.S. government debt        $  3,630,000   $  3,630,000    $ 7,431,000    $ 7,471,000
     U.S. corporate debt           87,881,000     87,984,000     15,267,000     15,230,000
     Foreign corporate debt        13,649,000     13,563,000

                                 ------------   ------------------------------------------
                                 $105,160,000   $105,177,000    $22,698,000    $22,701,000
                                 ============   ==========================================
</TABLE>

     Maturities  of debt  securities  classified  as held  to  maturity  were as
     follows at June 30, 2000:

     Years ended June 30,

                                        Amortized           Fair Market
                                           Cost                Value
          2001                       $ 35,668,000          $ 35,647,000
          2002                         59,484,000            59,474,000
          2003                         10,008,000            10,056,000
          2004                              --                    --
          2005 and thereafter               --                    --
                                     ------------          ------------
                                     $105,160,000          $105,177,000
                                     ============          ============

     Included in cash and cash  equivalents  were $18,681,000 of debt securities
     which mature prior to October 30, 2000.


                                       F-8


<PAGE>

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


     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.

     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 SCA Ventures,  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,
     2000 and 1999 was $1,230,000 and $1,099,000, 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


                                       F-9


<PAGE>


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


     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.

          Revenues from the sale of the Company's  other  products that are sold
     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  agreements with third parties
     are recognized when earned.

     Research and Development

          Research and development costs are expensed as incurred.

     Stock Compensation

          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.  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 by the Black-Scholes option-pricing model.


     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,  2000,  100,000  shares  of Series A
     Cumulative  Convertible  Preferred  Stock  ("Series A  Preferred  Stock" or
     "Series A Preferred  Shares")  were  converted to 227,271  shares of Common
     Stock.  Accrued  dividends of $1,947,000  on the Series A Preferred  Shares
     that were  converted,  were settled by cash  payments.  Additionally,  cash
     payments  totaling  $19 were  made for  fractional  shares  related  to the
     conversions.  There were no conversions of Series A Preferred Stock for the
     year ended June 30, 1999.

          During  the year  ended  June  30,  1998,  2,000  shares  of  Series A
     Preferred  Stock 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
     totaling $19 for fractional shares.

          Cash  payments  for interest  were  approximately  $4,000,  $8,000 and
     $14,000 for the years  ended June 30,  2000,  1999 and 1998,  respectively.
     There were no income tax  payments  made for the years ended June 30, 2000,
     1999 and 1998.


                                      F-10


<PAGE>


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


     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 $14,000,  $214,000 and $216,000 for the years ended June
     30, 2000,  1999 and 1998,  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
     potential  common shares is not included because the effect is antidilutive
     due to the net loss  recorded for the years ended June 30,  2000,  1999 and
     1998.  As of  June  30,  2000,  the  Company  had  approximately  5,364,000
     potentially  dilutive  common  shares  outstanding  that could  potentially
     dilute future earnings per share calculations.

     Comprehensive Income

          Effective  July 1, 1998,  the Company  adopted  Statement of Financial
     Accounting Standards No. 130 ("SFAS 130"), Reporting  Comprehensive Income.
     SFAS  130   establishes   new  rules  for  the  reporting  and  display  of
     comprehensive  income and its  components.  The adoption of SFAS 130 had no
     impact on the Company's  results of operations for the years ended June 30,
     2000,  1999 and 1998. The net loss is equal to the  comprehensive  loss for
     those periods.

(3)  Inventories

     Inventories consist of the following:

                                                    June 30,
                                          --------------------------
                                                 2000           1999
                                                 ----           ----
             Raw materials                   $283,000       $503,000
             Work in process                  504,000        548,000
             Finished goods                   160,000        276,000
                                          -----------   ------------
                                             $947,000     $1,327,000

(4)      Property and Equipment

         Property and equipment consist of the following:


<TABLE>
<CAPTION>
                                                     June 30,
                                                  ----------------            Estimated
                                                 2000           1999         useful lives
                                                 ----           ----         ------------
<S>                                        <C>            <C>                <C>
             Equipment                     $8,356,000     $8,024,000         3-7 years
             Furniture and fixtures         1,440,000      1,438,000         7 years
             Vehicles                          24,000         24,000         3 years
             Leasehold improvements         2,619,000      2,569,000         3-15 years
                                          -----------    -----------
                                          $12,439,000    $12,055,000
                                          ===========    ===========
</TABLE>

          During the years ended June 30,  2000 and 1999,  the  Company's  fixed
     asset disposals were approximately  $383,000 and $3,504,000,  respectively.
     The  disposals  in  1999  were  primarily  attributable  to  the  Company's
     consolidation  of research  operations  and the  elimination  of its leased
     facility at 40 Cragwood Road.


                                      F-11


<PAGE>


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


          Depreciation  and  amortization  charged  to  operations  relating  to
     property and equipment  totaled  $348,000,  $692,000 and $1,063,000 for the
     years ended June 30, 2000, 1999 and 1998, respectively.

(5)  Stockholders' Equity

          During the year ended June 30, 2000, the Company sold 2,300,000 shares
     of Common Stock in a public  offering at a gross  offering  price of $44.50
     per  share.  The  offering  resulted  in gross  proceeds  of  approximately
     $102,350,000 and net proceeds of approximately $95,670,000.

          During the year ended June 30, 1999, the Company sold 3,983,000 shares
     of Common Stock in a private  placement to a small group of investors.  The
     private placement  resulted in gross proceeds of approximately  $18,919,000
     and net proceeds of approximately $17,550,000.

          The board of  directors  has the  authority  to issue up to  3,000,000
     shares of preferred  stock, par value $0.01 per share, and to determine the
     price and terms,  including  preferences and voting rights, of those shares
     without stockholder approval.

     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, 2000 and 1999,  undeclared accrued dividends in
     arrears  were  $144,000  or $20.54  and  $1,984,000  or $18.54  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-12


<PAGE>


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


     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, 2000, the Company has reserved its common shares for special
     purposes as detailed below:


     Shares issuable upon conversion of
          Series A Preferred Shares                                       29,000
     Shares issuable upon exercise of outstanding warrants               100,000
     Non-Qualified Stock Option Plan                                   5,235,000
                                                                       ---------
                                                                       5,364,000
                                                                       =========

     Common Stock Warrants

          During  the year ended  June 30,  2000,  warrants  were  exercised  to
     purchase 1,012,000 shares of the Company's Common Stock at an average price
     of $4.57  per  share.  Of this  amount,  702,000  warrants  were  issued in
     connection with our January 1996 private  placement and 134,000 were issued
     during  the  year  ended  June  30,  1999 as  compensation  for  consulting
     services.  These  exercises  resulted in net  proceeds of  $4,406,000.  The
     exercise  price of and the number of shares  issuable  under these warrants
     were adjusted under standard  anti-dilution  provisions,  as defined in the
     warrants.

          During the year ended June 30, 1999,  150,000  warrants were exercised
     to  purchase  150,000  shares of the  Company's  Common  Stock at $2.50 per
     share.  These  warrants were issued during the year ended June 30, 1996, as
     part of the commission  due to a real estate broker in connection  with the
     termination of the Company's former lease at 40 Kingsbridge Road.

          As of June 30,  2000,  warrants to purchase  100,000  shares of Common
     Stock at an average exercise price of $5.92 per share were outstanding.

          During  the year ended  June 30,  1999,  the  Company  issued  200,000
     five-year  warrants to purchase  its Common  Stock at $6.50 per share,  the
     closing  price of the Common  Stock on the date of grant.  The warrants are
     consideration for consulting services to be rendered through February 2002.
     The estimated fair value of the warrants of approximately $917,000 is being
     amortized over the service period of three years.  The unamortized  portion
     is included as a component of other assets with the  corresponding  current
     portion included in other current assets on the consolidated  balance sheet
     as of June 30, 2000 and 1999.

(6)  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 non  executive,  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 Director's  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

                                      F-13


<PAGE>


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


     the years ended June 30, 2000,  1999 and 1998,  the Company  issued  3,000,
     9,000 and  17,000  shares of Common  Stock,  respectively,  to  independent
     directors, pursuant to the Independent Directors' Stock Plan.

(7)  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").  The number of
     shares  reserved for  issuance  under the  Company's  Stock Option Plan was
     increased from 6,200,000 to 7,900,000  during December 1999. As of June 30,
     2000,  5,235,000 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, 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 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 of SFAS No. 123.

<TABLE>
<CAPTION>
                                                         2000             1999              1998
                                                         ----             ----              ----
<S>                                                  <C>               <C>              <C>
                  Net loss - as reported              ($6,306,000)     ($4,919,000)     ($3,617,000)
                  Net loss - pro forma               ($10,008,000)     ($7,289,000)     ($5,638,000)
                  Loss per share - as reported             ($0.17)          ($0.14)          ($0.12)
                  Loss per share - pro forma               ($0.26)          ($0.21)          ($0.19)
</TABLE>

          The pro forma  effect on the loss for the three  years  ended June 30,
     2000 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,
     2000  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) volatility of 84%, 86% and 84%
     and (iv) a risk-free  interest rate of 6.19%, 5.06% and 5.57% for the years
     ended June 30, 2000, 1999 and 1998, respectively. The weighted average fair
     value at the date of grant for options  granted during the years ended June
     30,  2000,   1999  and  1998  was  $33.78,   $9.68  and  $5.85  per  share,
     respectively.






                                      F-14


<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, 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
 Canceled                                         (189,000)         6.69       $  2.09 to $14.88
                                                ----------
 Outstanding at June 30, 1998                    4,422,000          4.06       $  1.88 to $10.88

 Granted at exercise prices which equaled
  the fair market value on the date of grant       475,000          9.68       $  4.88 to $15.75
 Exercised                                      (1,001,000)         4.40       $  2.00 to $9.88
 Canceled                                         (172,000)         7.25       $ 2.81 to $14.50
                                                ----------
 Outstanding at June 30, 1999                    3,724,000          4.51       $ 1.88 to $15.75

 Granted at exercise prices which equaled
  the fair market value on the date of grant       302,000         33.78       $21.50 to $69.50
 Exercised                                        (809,000)        38.71       $20.06 to $70.75
 Canceled                                          (11,000)        20.53       $ 6.00 to $37.38
                                                ----------
 Outstanding at June 30, 2000                    3,206,000          7.35       $ 1.88 to $69.50
                                                ==========
</TABLE>

     As of June 30, 2000, the 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 - $2.69      682,000         5.89          $2.49        682,000          $2.49
           $2.75 - $2.94      626,000         5.73          $2.85        626,000          $2.85
           $3.06 - $3.56      280,000         5.37          $3.51        280,000          $3.51
           $3.75 - $5.50      509,000         4.33          $4.59        507,000          $4.59
           $5.88 - $6.50      607,000         7.73          $6.23        471,000          $6.15
           $7.50 - $22.31     311,000         8.25         $17.08         87,000         $13.83
          $24.00 - $51.56     184,000         9.02         $39.28         10,000         $32.88
          $61.00 - $69.50       7,000         9.70         $61.75             --             --
                            ---------                                  ---------      ---------
                            3,206,000         6.33          $7.35      2,663,000          $4.21
                            =========                                  =========      =========
</TABLE>

                                      F-15


<PAGE>


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


(8)  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, 2000 and 1999,  the tax effects of  temporary  differences
     that give rise to the deferred tax assets and deferred tax  liabilities are
     as follows:
<TABLE>
<CAPTION>
                                                                             2000              1999
                                                                             ----              ----
<S>                                                                      <C>             <C>
          Deferred tax assets:
            Inventories                                                  $    603,000    $    272,000
            Investment valuation reserve                                       86,000          86,000
            Contribution carryover                                             28,000          20,000
            Compensated absences                                              157,000         127,000
            Excess of financial statement over tax depreciation               924,000       1,031,000
            Royalty advance - Aventis                                         395,000         371,000
            Non-deductible expenses                                         1,025,000       1,497,000
            Federal and state net operating loss carryforwards             50,808,000      44,531,000
            Research and development and investment tax credit
              carryforwards                                                 8,860,000       8,176,000
                                                                         ------------    ------------

            Total gross deferred tax assets                                62,886,000      56,111,000

            Less valuation allowance                                      (62,180,000)    (55,405,000)
                                                                         ------------    ------------

                    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>


                                     F-16


<PAGE>



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


          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,
     2000 and 1999 was an increase of $6,775,000 and  $4,428,000,  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, 2000 of  $3,540,000  relating to the  valuation  allowance  for
     deferred tax assets will be allocated to additional paid-in capital.

          At  June  30,  2000,  the  Company  had  federal  net  operating  loss
     carryforwards  of approximately  $132,917,000  for tax reporting  purposes,
     which expire in the years 2001 to 2020. The Company also has investment tax
     credit  carryforwards of approximately  $3,200 and research and development
     tax credit  carryforwards  of  approximately  $7,159,000  for tax reporting
     purposes which expire in the years 2001 to 2020.  The Company's  ability to
     use such net operating  loss,  investment and research and  development tax
     credits  carryforwards are subject to certain  limitations due to ownership
     changes,  as  defined by rules  pursuant  to  Section  382 of the  Internal
     Revenue Code of 1986, and as amended.

          In  addition,  the net  operating  loss  carryfoward  of  $132,917,000
     includes  $47,864,000  from the  acquisition of Enzon,  Labs, Inc. which is
     subject to an annual limitation of $613,000.

(9)  Significant Agreements

     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(R)A     (interferon    alfa    2b),    a
     genetically-engineered  anticancer and antiviral drug with longer activity.
     During   December  1999,   Schering-Plough   submitted  a  U.S.   marketing
     application  to the  FDA  for the use of  PEG-INTRON  in the  treatment  of
     chronic  hepatitis  C.  In  May  2000,  PEG-INTRON  was  granted  marketing
     authorization  in the European  Union for the  treatment of adult  patients
     with  chronic  hepatitis  C.  Schering-Plough  is  conducting  a Phase  III
     clinical  trial of  PEG-INTRON  as  combination  therapy  with  REBETOL for
     hepatitis C and Phase III clinical  trials of PEG-INTRON  for the treatment
     of chronic  myelogenous  leukemia and  malignant  melanoma.  Earlier  stage
     clinical trials of PEG-INTRON are being conducted for various solid tumors,
     as well as HIV, hepatitis B, and multiple sclerosis.

          Under the license  agreement,  which was amended in 1995 and 1999, the
     Company will receive  royalties on worldwide  sales of PEG-INTRON,  if any.
     Schering is responsible  for  conducting and funding the clinical  studies,
     obtaining  regulatory  approval and marketing  the product  worldwide on an
     exclusive  basis.  During  1999,  the  Company  and  Schering  amended  the
     agreement  that  resulted in an increase in the  effective  royalty rate in
     return for Enzon's exclusive U.S.  manufacturing rights for the product and
     a license  under one of the  Company's  Second  Generation  PEG patents for
     Branched or U-PEG.  The license for Branched PEG gives Schering the ability
     to sublicense the patent for a competing interferon product.




                                      F-17


<PAGE>


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


          The  Company may be entitled  to  additional  payments  subject to the
     achievement of certain  milestones.  During  February 2000,  $1,000,000 was
     received and recognized as revenue,  related to the filing for FDA approval
     of PEG-INTRON.  Enzon may be entitled to an additional $2,000,000 milestone
     payment  from   Schering.   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 Enzon fails to obtain or  maintain  the  requisite  product
     liability insurance.

     Aventis Agreement

          Under the Company's Amended Aventis  Pharmaceuticals,  (formerly Phone
     Poulenc Rorer Pharmaceuticals,  Inc.) U.S. License Agreement, Enzon granted
     an  exclusive  license to Aventis to sell  ONCASPAR  in the U.S.  Enzon has
     received  licensing  payments  totaling   $6,000,000  and  is  entitled  to
     royalties  on net sales of ONCASPAR.  During July 2000 the Company  further
     amended the license  agreement  with  Aventis to increase  the base royalty
     payable  to the  Company  on net sales of  ONCASPAR  from 23.5% to 27.5% on
     annual  sales up to $10  million  and 25% on  annual  sales  exceeding  $10
     million.  These royalty payments,  will include Aventis' cost of purchasing
     ONCASPAR under the supply agreement.  The agreement was also extended until
     2016.  Additionally,  the amended  license  agreement  eliminated the super
     royalty of 43.5% on net sales of ONCASPAR which exceed certain  agreed-upon
     amounts.  The Amended  Aventis 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  royalties  to Enzon under the  Amended  Aventis  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
     Aventis  under the original  Aventis U.S.  License  Agreement  and interest
     expense.  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,  2000 and 1999.  The  royalty
     advance will be reduced as royalties are  recognized  under the  agreement.
     Through June 30, 2000 an aggregate of  $4,313,000  in royalties  payable by
     Aventis has been offset against the original credit.

          The amended license agreement prohibits Aventis from making,  using or
     selling an asparaginase product in the U.S. or a competing PEG-asparaginase
     product  anywhere  in the world  until the later of the  expiration  of the
     agreement  or, if the  agreement is  terminated  earlier,  five years after
     termination.  The agreement  terminates in December 2016 but  automatically
     renews for  additional  one-year  periods  unless either party notifies the
     other in writing that it intends not to renew the  agreement at least three
     months prior to the end of the current term.  It can be terminated  earlier
     by either  party due to a default by the other.  In  addition,  Aventis may
     terminate  the  agreement at any time upon one year's prior notice to us or
     if we are unable to supply product for more than 60 days under our separate
     supply  agreement  with  Aventis.   When  the  amended  license   agreement
     terminates,  all rights  granted to Aventis under the agreement will revert
     to Enzon.  Under a  separate  supply  agreement,  Aventis  is  required  to
     purchase from Enzon all of its product  requirements  for sales of ONCASPAR
     in North  America.  If the Company is unable to supply  product to Aventis,
     under the supply

                                      F-18


<PAGE>

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


     agreement  for more than 60 days for any reason other than a force  majeure
     event,  Aventis may terminate the supply  agreement and the Company will be
     required  to  exclusively   license   Aventis  the  know-how   required  to
     manufacture  ONCASPAR  for the period of time  during  which the  agreement
     would have continued had the license agreement not been terminated.

          During August 2000 the Company made a $1.5 million  payment to Aventis
     which  was  accrued  at June 30,  2000 to  settle a  disagreement  over the
     purchase  price of  ONCASPAR  under  the  supply  agreement  and to  settle
     Aventis' claim that Enzon should be  responsible  for Aventis' lost profits
     while   ONCASPAR  is  under  the   temporary   labeling  and   distribution
     modifications.

          Further  beginning in May 2000,  for each month that expires  prior to
     the Company's  receipt of FDA approval to allow marketing and  distribution
     of ONCASPAR  without such  labeling  and  distribution  modifications,  the
     Company  shall pay to Aventis  $100,000.  The Company had not received such
     approval as of September 15, 2000.

          Under  a  separate  license,  Aventis  has  exclusive  rights  to sell
     ONCASPAR  in Canada and  Mexico.  These  agreements  provide for Aventis 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. These  agreements  expire 10 years after the first  commercial sale of
     ONCASPAR in each country, but automatically renew for consecutive five-year
     periods unless either party elects to terminate at least three months prior
     to the end of the current term.  Aventis may terminate these  agreements on
     one year's prior notice to the Company.

          The Company also has a license  agreement with Aventis 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 Aventis 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,  Aventis  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.

     MEDAC Agreement

          The  Company  also  granted  an  exclusive  license  to  MEDAC to sell
     ONCASPAR and any  PEG-asparaginase  product developed by us or MEDAC during
     the term of the  agreement  in  Western  Europe,  Turkey  and  Russia.  The
     Company's  supply  agreement  with  MEDAC  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  license
     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.  The MEDAC license
     terminates  in  October  2001,  but  automatically  renews  for  successive
     two-year  periods  unless  either  party  elects to terminate at least nine
     months  prior to the end of the  current  term.  MEDAC  may  terminate  the
     agreement after providing the Company with one year's prior notice.




                                      F-19


<PAGE>

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


(10) Commitments and Contingencies

          In January 2000, Hoffmann-La Roche filed lawsuits in both the U.S. and
     France against  Schering-Plough  alleging that PEG-Intron infringes certain
     patents held by  Hoffmann-La  Roche.  The validity and scope of Hoffmann-La
     Roche's  patents  in this  segment  of the  industry  could  be  judicially
     determined during these proceedings.

          The  litigation  is at a very early  stage and the Company is not in a
     position to predict its  outcome.  If  Schering-Plough  does not prevail in
     this litigation,  Hoffmann-La  Roche may completely  block  Schering-Plough
     from  commercializing  PEG-INTRON  and the  Company  will not  receive  any
     royalties on the sales of  PEG-INTRON.  This would have a material  adverse
     effect on the  Company's  business,  financial  condition  and  results  of
     operations.

          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").  The Company has agreed with the FDA to  temporary
     labeling  and  distribution  modifications  for  ONCASPAR  due to increased
     levels of particulates  in certain  batches of ONCASPAR,  which the Company
     manufactured. The Company, rather than its marketing partner, Aventis, will
     temporarily  distribute  ONCASPAR  directly  to  patients,  on an as needed
     basis.  The  Company  will  conduct  additional   inspection  and  labeling
     procedures prior to distribution.

          The Company  anticipates  a final  resolution  of the  problem  during
     fiscal  2001.  It is expected  that  Aventis  will resume  distribution  of
     ONCASPAR at that time. There can be no assurance that this solution will be
     acceptable  to the FDA or  Aventis.  If the  Company  cannot  resolve  this
     problem it is possible  that the FDA may not permit the Company to continue
     to  distribute  this product.  An extended  disruption in the marketing and
     distribution  of ONCASPAR  could have a material  adverse  impact on future
     ONCASPAR sales.

          The Company maintains a separate supply agreement with Aventis,  under
     which  The  Company  is  responsible  for  the  supply  of all of  Aventis'
     requirements for ONCASPAR.

          During August 2000, the Company made a $1.5 million payment to Aventis
     which was accrued for at June 30 to settle a disagreement over the purchase
     price of ONCASPAR under the supply  agreement and to settle  Aventis' claim
     that the Company  should be  responsible  for Aventis'  lost profits  while
     ONCASPAR is under the  temporary  labeling and  distribution  modifications
     described  above.  Further  beginning  in May 2000 and for each  month that
     expires prior to the Company's  receipt of FDA approval to allow  marketing
     and  distribution  of ONCASPAR  without  such  labeling  and  distributions
     modifications,  the Company shall pay to Aventis $100,000.  The Company had
     not received such approval as of September 15, 2000.

          During April 2000, the Company agreed to binding arbitration to settle
     a lawsuit, filed by LBC Capital Resources,  Inc. ("LBC") a former financial
     advisor,  in the  United  States  District  Court for the  District  of New
     jersey. The arbitrator awarded LBC a $6,000,000  judgment.  In its suit LBC
     claimed  that  under a May 2, 1995  letter  agreement  between  LBC and the
     Company,  LBC was entitled to a commission in connection with the Company's
     January  and March 1996  private  placements,  comprised  of  $675,000  and
     warrants to purchase 1,250,000 shares of the Company's common


                                      F-20


<PAGE>

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


     stock  at an  exercise  price  of  $2.50  per  share.  As a  result  of the
     arbitration award, the Company recognized a net charge to selling,  general
     and  administrative  expenses of approximately  $2,600,000 during the third
     quarter of the year  ended June 30,  2000.  The charge  represents  the net
     profit and loss effect of the incremental  reserves  provided  specifically
     for  this  litigation,  offset  by the  reduction  during  the  quarter  of
     $2,900,000  of  other  contingency  accruals  that  were  deemed  to not be
     required for certain other contingencies.

          The  Company  has  agreements   with  certain  members  of  its  upper
     management which provide for payments following a termination of employment
     occurring after a change in control of the Company. The Company also has an
     employment  agreement,  dated  August 10,  2000,  with its Chief  Executive
     Officer which provides for severance  payments in addition to the change in
     control provisions discussed above.

(11) Leases

          The Company has several leases for office,  warehouse,  production and
     research facilities and equipment.

          Future minimum lease  payments,  net of subleases,  for  noncancelable
     operating  leases with  initial or  remaining  lease terms in excess of one
     year as of June 30, 2000 are:

                  Year ending                                Operating
                  June 30,                                     leases
                  --------                                     ------
                    2001                                      1,003,000
                    2002                                        834,000
                    2003                                        779,000
                    2004                                        765,000
                    2005                                        765,000
                  Later years, through 2007                   1,987,000
                                                            -----------
                  Total minimum lease payments               $6,133,000
                                                            ===========

          Rent expense amounted to $1,055,000, $1,394,000 and $1,768,000 for the
     years ended June 30, 2000, 1999 and 1998, respectively.

          For the years  ended June 30,  1999 and 1998,  rent  expense is net of
     subrental income of $110,000 and 221,000 respectively. As of June 30, 1999,
     the Company no longer subleases a portion of its facilities.

(12) 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.  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, 2000,  1999 and 1998 were  $128,000,  $115,000 and $100,000,
     respectively.



                                      F-21
<PAGE>

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


(13)     Accrued Expenses

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

                                                        2000             1999
                                                        ----             ----
                  Accrued wages and vacation         $1,238,000      $1,074,000
                  Accrued Medicaid rebates              962,000       1,114,000
                  Current portion of royalty
                    advance - Aventis                   854,000         200,000
                  Contract and legal accrual          1,500,000       3,328,000
                  Other                               1,153,000         546,000
                                                      ---------         -------
                                                     $5,707,000      $6,262,000
                                                     ==========      ==========


(14) Business and Geographical Segments

          The  Company is  managed  and  operated  as one  business.  The entire
     business  is  comprehensively  managed  by a single  management  team  that
     reports  to the Chief  Executive  Officer.  The  Company  does not  operate
     separate  lines of business or separate  business  entities with respect to
     any of its products or product  candidates.  In addition,  the Company does
     not  conduct  any  of  its   operations   outside  of  the  United  States.
     Accordingly,  the Company does not prepare discrete  financial  information
     with  respect to separate  product  areas or by location  and does not have
     separately reportable segments as defined by SFAS No. 131.

          During the years ended June 30, 2000,  1999 and 1998,  the Company had
     export sales of $4,104,000,  $3,075,000 and  $2,641,000,  respectively.  Of
     these  amounts,  sales to Europe  represented  $3,584,000,  $2,559,000  and
     $2,117,000   during  the  years  ended  June  30,  2000,   1999  and  1998,
     respectively. Included as a component of European sales are sales to France
     which were  $1,201,000,  $1,108,000  and  $994,000 and sales to Italy which
     were  $1,285,000,  $1,201,000,  $879,000 for the years ended June 30, 2000,
     1999 and 1998.

          ADAGEN sales represent approximately 78%, 90% and 82% of the Company's
     total  net  sales  for the  year  ended  June  30,  2000,  1999  and  1998,
     respectively.  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  46%, 49% and 48% of the Company's  ADAGEN sales for
     the years ended June 30, 2000,  1999 and 1998,  respectively,  were made to
     Medicaid patients.




                                      F-22


<PAGE>
                                  EXHIBIT INDEX


Exhibit                                                   Page
Numbers           Description                             Number
-------           -----------                             ------

10.15             Employment Agreement with                E1
                   Peter G. Tombros dated as of
                   August 10, 2000                        E24
 21.0             Subsidiaries of Registrant              E25
 23.0             Consent of KPMG LLP                     E26
 27.0             Financial Data Schedule                 E27












                                      F-23


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