OXIGENE INC
S-3/A, 1998-07-23
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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              As filed with the Securities and Exchange Commission
                                on July 23, 1998

================================================================================


                       SECURITIES AND EXCHANGE COMMISSION
- --------------------------------------------------------------------------------

                   POST-EFFECTIVE AMENDMENT NO. 4 ON FORM S-3
- --------------------------------------------------------------------------------
                                       TO
- --------------------------------------------------------------------------------
                                    FORM S-1
- --------------------------------------------------------------------------------
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

                                  OXiGENE, INC.
- --------------------------------------------------------------------------------

             (Exact name of registrant as specified in its charter)

                                    Delaware
- --------------------------------------------------------------------------------

         (State or other jurisdiction of incorporation or organization)

                                   13-3679168
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                      (I.R.S. Employer Identification No.)

          One Copley Place, Suite 602, Boston, MA 02116, (617) 536-9500
- --------------------------------------------------------------------------------

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

        Mr. David Sherris, One Copley Place, Suite 602, Boston, MA 02116,
                                 (617) 536-9500
- --------------------------------------------------------------------------------

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

                                 With a copy to:

                             Gerald A. Eppner, Esq.
                          Cadwalader Wickersham & Taft
                                 100 Maiden Lane
                            New York, New York 10038
                                 (212) 504-6000

     Approximate date of commencement of proposed sale to the public:  From time
to time after the effective date of this post-effective amendment.

     If the only  securities  being  registered  on this Form are being  offered
pursuant to dividend or interest  reinvestment plans, please check the following
box.  [ ]


     If any of the securities being registered on this form are to be offered on
a delayed or continuous  basis  pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box. [X]

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

     If this form is a  post-effective  amendment  filed pursuant to Rule 462(c)
under the  Securities  Act,  check the following box and list the Securities Act
registration  statement number of the earlier effective  registration  statement
for the same offering. 33-64968

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

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

     The registrant  hereby amends this  registration  statement on such date or
dates as may be necessary to delay its effective date until the registrant shall
file a further  amendment  which  specifically  states  that  this  registration
statement shall  thereafter  become effective in accordance with section 8(a) of
the  Securities  Act of 1933 or until the  registration  statement  shall become
effective on such date as the Commission,  acting pursuant to said section 8(a),
may          determine.


<PAGE>

PROSPECTUS

906,541   Shares  of  Common   Stock   Underlying   Publicly   Traded   Warrants
================================================================================


                                  OXiGENE, INC.

     This Prospectus  relates to up to 906,541 shares of Common Stock, par value
$.01 per share  (the  "Common  Stock"),  of  OXiGENE,  Inc.  (the  "Company"  or
"OXiGENE"), that may be issued by the Company upon the exercise of warrants (the
"Warrants") which were included in the Units (the "Units")  originally issued by
the Company  pursuant to a  prospectus  dated  August 26, 1993 (the  "Separation
Date"),  of which 847,235  warrants  remain  outstanding  on July 17, 1998.  The
Warrant Agreement, dated August 26, 1993 (the "Warrant Agreement"),  between the
Company and American Stock  Transfer & Trust Company as Warrant Agent,  pursuant
to which the Warrants  were  issued,  provided  that each  Warrant  entitles the
holder  thereof to purchase one share of Common Stock for $7.00 during the first
year of  exercisability  ending on the first anniversary of the Separation Date,
with  the  exercise  price  thereafter   increasing  by  $2.00  on  each  annual
anniversary  of the Separation  Date.  The Warrant  exercise price is subject to
adjustment in the event of the  occurrence of certain  events,  including  stock
dividends,  stock  splits,  mergers  and  reclassifications  (the  "Antidilution
Provisions").  As a result of the Antidilution Provisions,  the current exercise
price of each Warrant is $14.35.

     On August 29, 1994,  the Company and the Warrant  Agent amended the Warrant
Agreement in certain respects.  As so amended,  the Warrant Agreement  currently
provides that each Warrant  entitles the holder thereof to acquire upon exercise
of the Warrant  1.07 shares of Common  Stock at an exercise  price of $14.35 per
share.  No  fractional  shares are to be issued.  Unless  extended,  unexercised
Warrants  were to expire by their  terms at the close of  business on August 26,
1998 (the "Original Expiration Date").

     On July 8, 1998,  the  Company and the  Warrant  Agent  amended the Warrant
Agreement  to provide  that (a) at 5:00  p.m.,  New York City time on August 26,
1998,  with no action  required to be taken by the holders of the Warrants,  the
Original  Expiration  Date will be extended (the  "Extension") to 5:00 p.m., New
York City time, on December 31, 1999 (the "Amended  Expiration  Date"), (b) each
Warrant shall be exercisable on and after August 26, 1998, and until the Amended
Expiration Date, for 1.07 shares of Common Stock at a price of $14.35 (i.e., the
exercise price currently in effect), subject only to the Antidilution Provisions
(the  "Price  Amendment"),  and  (c) the  Company  has  the  right,  but not the
obligation,  at any time after the Original  Expiration Date, to redeem,  at any
time or from time to time, any or all of the Warrants (the "Call" and,  together
with  the  Extension  and the  Price  Amendment,  the  "Amendments");  provided,
however, the Company may exercise the Call only if (i) the average trading price
of the shares of the Company's  Common Stock, as reported by the National Market
of The Nasdaq Stock Market, Inc.  ("Nasdaq"),  for any period of ten consecutive
trading  days (not  including  any days on which the Nasdaq is open for trading,
but there are no  purchases  or sales of Common  Stock),  has traded at not less
than  $16.00 per  share,  and (ii) the  Company  has given not less than 20 days
written notice to the holders of Warrants  indicating the Company's  election to
exercise the Call.  Following a Call,  any Warrants that were called that remain
unexercised  at the end of the 20-day  notice  period will be redeemed  promptly
thereafter at a redemption price of $.001 per Warrant, payable by the Company in
cash.

     The  holders  of  Warrants  need  take no  action  in  connection  with the
Amendments to the Warrant  Agreement,  which apply to all outstanding  Warrants.
The  holders of  Warrants  need not turn in their  certificates  evidencing  the
Warrants   that  do  not  reflect  the   Amendments   (the   "Original   Warrant
Certificates")  even after the  Original  Expiration  Date.  However,  after the
Original  Expiration  Date,  any holder of Warrants  has the right,  but not the
obligation,  at its election,  to surrender Original Warrant Certificates to the
Warrant  Agent which will  thereupon be replaced  with  certificates  evidencing
Warrants  containing the Amendments  (the "Revised  Warrant  Certificates").  In
addition, after the Original Expiration

<PAGE>

     Date,  Revised Warrant  Certificates  will be issued in connection with (a)
any transfer of Warrants  evidenced by Original  Warrant  Certificates  or (b) a
partial exercise of Warrants evidenced by Original Warrant Certificates.

     Other than the amendments to the Warrant  Agreement  specifically set forth
in  Post-Effective  Amendment  No.  4 on  Form  S-3  to  Form  S-1  Registration
Statement,  of which this  Prospectus is a part,  and other than as set forth in
Post-Effective  Amendment No. 2 on Form S-3 to Form S-1 Registration  Statement,
dated  September  30, 1994,  the Warrant  Agreement  has not been  amended.  The
Company will receive the full proceeds of the exercise of any Warrants.

     The shares of Common  Stock of the Company  are traded on Nasdaq  under the
symbol  "OXGN." The last reported  sale price of the  Company's  Common Stock as
reported by Nasdaq on July 6, 1998 was $11.8125.

     The  Securities  Offered  Hereby  Involve a High Degree of Risk.  See "Risk
Factors" beginning on page 7.

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

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

                  The date of this Prospectus is July 23, 1998.




<PAGE>



                            FORWARD-LOOKING STATEMENT

     Certain  statements in this  Prospectus  under the captions "The  Company,"
"Use  of  Proceeds,"  "Risk  Factors,"  "Plan  of  Distribution"  and  elsewhere
constitute  "forward-looking  statements"  within  the  meaning  of the  Private
Securities  Litigation  Reform  Act of  1995.  Such  forward-looking  statements
involve known and unknown risks,  uncertainties and other important factors that
could cause the actual  results,  performance or  achievements of the Company to
differ materially from any future results, performance or achievements expressed
or implied by such  forward-looking  statements.  Such risks,  uncertainties and
other important  factors  include,  among others:  general economic and business
conditions;  patent  protection,   enforcement  and  infringement;   proprietary
technology; industry trends; competition; ability to develop markets; changes in
business strategy or development  plans;  availability,  terms and deployment of
capital;  availability  of  qualified  personnel;  changes in, or the failure or
inability to comply with, government regulation; ability to develop and test its
technology  and  compounds;  ability to continue  its  clinical  trial  program,
research and  development  and  collaborative  arrangements;  and other  factors
referenced   in  the  "Risk   Factor"   section   of  this   Prospectus.   These
forward-looking  statements  speak only as of the date of this  Prospectus,  and
there is no assurance that the  forward-looking  information will be accurate or
that the  assumptions  on which  they are based will  prove to be  correct.  The
Company  expressly  disclaims any obligation or  undertaking to disseminate  any
updates  or  revisions  to any  forward-looking  statement  contained  herein to
reflect any change in the  Company's  expectations  with  regard  thereto or any
change in events,  conditions or  circumstances  on which any such  statement is
based.

                                   THE COMPANY

     OXiGENE,   Inc.   ("OXiGENE"  or  the   "Company")   is  an   international
biopharmaceutical   company  developing  a  portfolio  of  products  that  focus
primarily on combating  cancer.  The Company's  initial  product  development is
based on  proprietary  DNA repair  technology.  The Company  currently has three
product    candidates   in   clinical    development.    Neu-Sensamide(TM),    a
radiosensitizer,  is in a Phase III clinical  trial in patients  with  non-small
cell lung cancer and two Phase I studies in patients with glioblastoma.  Oxi-104
is being  developed  as a  chemosensitizer  in Phase I studies in patients  with
advanced stage cancers.  Cordycepin is a compound in Phase I studies in patients
with TdT positive  leukemia.  The Company is also developing  Combretastatin A-4
phosphate,  a  tumor  vascular  targeting  agent  that in  pre-clinical  studies
destroyed   the  blood  vessels  that  enable  a  tumor  to  survive  and  grow.
Combretastatin is expected to enter clinical trials in the second half of 1998.

     OXiGENE's  principal  products,  Neu-Sensamide(TM)  and  Oxi-104  (proposed
generic  name  declopramide),  are  sensitizers,  drugs  that make a tumor  more
susceptible to damage by radiation or  chemotherapy.  Both products are based on
the Company's  proprietary  knowledge of the processes by which certain  enzymes
repair damaged DNA sites, a function essential to a cell's survival.  The cell's
enzymes that normally  repair DNA damage to the tumor cell counter the cytotoxic
(cell-killing)  effects of radiation  and  chemotherapy  by repairing  the tumor
cell's DNA that has been damaged by either of those therapies. When administered
in accordance with its prescribed regimen, the Company believes, on the basis of
its clinical studies, that  Neu-Sensamide(TM)  should make cancerous tumor cells
more  sensitive to radiation by  inhibiting  DNA repair  activity,  consequently
increasing tumor damage from radiation therapy in those cells. Accordingly,  the
Company  expects that patient  response to radiation  therapy should be improved
and may result in increased  tumor  shrinkage,  reduced side  effects,  or both.
Based on the  results of  preclinical  animal  studies,  OXiGENE  believes  that
Oxi-104 alone may induce tumor growth-inhibiting and tumor-killing effects.

     Neu-Sensamide(TM)  is  a  proprietary  reformulation  of  Sensamide,(TM)  a
prototype drug in which  metoclopramide is the active  ingredient.  In September
1997,  the Company  announced  the first  preliminary  results of its  European,
randomized,   controlled   Phase  II/III  clinical  trial  of  Sensamide(TM)  in
combination  with radiation  therapy in 218 patients with  inoperable  non-small
cell lung cancer  ("NSCLC"),  which indicated an increased  median survival time
for those patients who received a full dosage of  Sensamide(TM)  plus radiation.
In March 1998, the Company  supplemented  those  preliminary  results with tumor
response  data.  The  additional  study data  indicate  that more  patients with
squamous  cell  carcinoma  (the most common form of lung cancer) and a Karnofsky
score (a  benchmark  for  assessing  the  degree of illness  or  terminally  ill
patients)  of  90  or  higher,  when  receiving  Sensamide(TM)  plus  radiation,
experienced  tumor  response.   Forty-seven  percent  (47%)  of  those  patients
experienced complete or partial (complete is 100% and partial is 50% or greater)
tumor  response,  compared to 30% for patients who  received  radiation  only. A
significant  number of patients  did not complete  the  Sensamide(TM)  treatment
because of either the Central Nervous System (CNS) side effects  associated with
metoclopramide  (approximately  25%) or the progressive  deterioration  of their
health   (approximately  20%).  These  CNS  side  effects  (sedation,   anxiety,
restlessness and depression), however, are reversible, have been well documented
in the clinical  literature  for more than 30 years,  and were not unexpected by
the Company.  The Company believes those results constitute  sufficient proof of
the theory underlying its principal scientific concept to provide a basis for it
to continue  advanced  clinical  studies  with  respect to its later  generation
drugs,  which,  the Company  believes,  have  reduced  side  effects  from those
experienced with Sensamide(TM) (as described above).

     In the fourth quarter of 1996, OXiGENE commenced an additional  randomized,
controlled   Phase  III  clinical   trial  in  226  patients  with  NSCLC  using
Neu-Sensamide(TM),  the Company's  second-generation  sensitizer  drug. Based on
preliminary  preclinical  studies  and a Phase I  clinical  trial,  the  Company
believes  that  Neu-Sensamide(TM)  will show a reduced CNS side  effect  profile
compared to  Sensamide,(TM)  resulting  in an increase of the number of patients
completing   treatment.   The  Company   intends  to  use  the  results  of  the
Sensamide(TM)   study  to   support   a  New  Drug   Application   ("NDA")   for
Neu-Sensamide(TM)  as a radiation  sensitizer for the treatment of patients with
NSCLC.

     In the fourth quarter of 1997, a 15-patient,  open-label,  Phase I study of
Neu-Sensamide(TM)  in patients with  glioblastoma,  a highly  malignant  form of
brain  cancer,   commenced  in  the  United  States.  The  European  Phase  I/II
counterpart of this study was initiated in Sweden in the second quarter of 1996.

     After the filing of an  Investigational  New Drug ("IND")  application with
the U.S.  Food and Drug  Administration  ("FDA")  in  March  1997,  the  Company
commenced Phase I/II clinical tests of Oxi-104,  the Company's third  generation
sensitizer, in combination with 5-FU and Cisplatin  (chemotherapeutic agents) in
patients with advanced stages of cancer.  Oxi-104 is an N-substituted  benzamide
but,  unlike   Sensamide(TM)   and   Neu-Sensamide,(TM)   it  is  not  based  on
metoclopramide  (an N-substituted  benzamide).  Oxi-104 has been designed with a
molecular  structure that, the Company  believes,  may reduce side effects while
maintaining the sensitizing properties of other N-substituted benzamides.

     The first of the Company's products being developed,  under a collaborative
arrangement,  as a direct treatment of cancer is Cordycepin.  A Phase I clinical
study of Cordycepin in combination  with Pentostatin in patients with refractory
TdT-positive  acute lymphoid  leukemia  started in the first quarter of 1997, in
collaboration  with Boston  Medical Center  Corporation,  an affiliate of Boston
University  Medical  Center  ("BMC"),  and the National  Cancer  Institute.  The
collaboration  with BMC was expanded  with the  appointment  of Dr. Ronald Pero,
OXiGENE's  Chief  Scientific  Officer,  as  a  professor  and  member  of  BMC's
scientific staff and the creation of an OXiGENE-sponsored research facility that
will conduct  research  into,  among other  things,  the  potential  therapeutic
synergies between N-substituted benzamides and Cordycepin and related compounds.
OXiGENE  has an option to  acquire  an  exclusive,  world-wide,  royalty-bearing
license  with  respect  to  any  invention  or  product,  including  Cordycepin,
conceived in the course of work performed under the BMC agreement.

     In  May  1997,  OXiGENE  entered  into  an  agreement  with  Arizona  State
University  ("ASU")  to  develop  and  test  certain  Combretastatin  compounds,
including  Combretastatin  A-4  Prodrug  (hereinafter  generally  referred to as
"Combretastatin"). Combretastatins are naturally-occurring substances, that were
identified and isolated by Dr. George R. Pettit, Regents Professor of Chemistry,
and  his   colleagues  at  ASU,  from  the  South   African   bushwillow   tree.
Combretastatin  is  believed to block the growth of new blood  vessels  into the
tumor and to destroy recently-formed blood vessels within the tumor. OXiGENE has
an option to acquire an  exclusive,  world-wide,  royalty-bearing  license  with
respect to the commercial rights to Combretastatin.

     The Company has also  developed  proprietary  assays  (tests)  that measure
levels of the DNA repair  enzyme PARP (Poly (ADP Ribose)  Polymerase)  in blood,
thereby  suggesting DNA repair activity that the Company believes  correlates to
immune function and status, and has identified a mixture of compounds, Nicoplex,
that it believes may be capable of stimulating DNA repair.  Based on preclinical
studies to date, OXiGENE has commenced the clinical development of these product
areas.

     There can be no assurance that the Company's  existing and planned  product
development efforts and clinical trials for Sensamide,(TM)  Neu-Sensamide(TM) or
any other  compounds,  will be successful or completed  within  anticipated time
frames,  or at all;  that  regulatory  approvals  will be obtained or will be as
broad as sought;  or that any  products,  if  introduced,  will  achieve  market
acceptance. In addition, there can be no assurance that the Company's technology
will prove  effective,  that the  Company  will be able to enter into  strategic
alliances or joint  ventures or that the terms  thereof will be favorable to the
Company, or that the Company will be profitable.

     The Company was  incorporated  in New York in 1988,  and  subsequently  was
re-incorporated  in  Delaware  in  1992.  The  Company   established  a  Swedish
subsidiary,  OXiGENE  Europe  AB, in  December  1994.  The  Company's  principal
executive  office is located at One Copley Place,  Suite 602,  Boston,  MA 02116
(phone   no.:   617-536-9500;   fax  no.:   617-536-4700,   and  in   Sweden  at
Blasieholmsgatan  2C, S-111 48 Stockholm,  Sweden (phone no.: 011 46 8 678 8720;
fax no.:  011 46 8 678  8605)  and at  Scheelevagen  17,  S-223 70 Lund,  Sweden
(telephone  no.: 011 46 46 16 8860; fax no.: 011 46 46 16 8866).  Any references
in this  Prospectus to "OXiGENE" or the "Company"  shall mean OXiGENE,  Inc. and
its wholly-owned Swedish subsidiary, OXiGENE Europe AB.




<PAGE>




                                  RISK FACTORS

     An investment in the shares of Common Stock offered hereby is  speculative,
involves a high  degree of risk and should  only be made by persons or  entities
capable to afford a loss of their  entire  investment.  In addition to the other
information  included elsewhere or incorporated by reference in this Prospectus,
the  following  risk factors  should be  considered  carefully in  evaluating an
investment in the shares of Common Stock offered hereby.

     This   Prospectus   contains,   in  addition  to  historical   information,
forward-looking   statements   that   involve   known  and  unknown   risks  and
uncertainties  that may cause the  Company's  actual  results or  outcomes to be
materially  different from those anticipated and discussed herein.  Factors that
could cause or contribute to such  differences  include those discussed below as
well as those discussed elsewhere in this Prospectus.

     History of Losses and Anticipated Future Financial Results;  Uncertainty of
Future  Profitability.  The Company,  as a  development  stage  enterprise,  has
experienced  net losses every year since its  inception  and, as of December 31,
1997, had a deficit  accumulated  during the development  stage of approximately
$25.5 million. The Company anticipates incurring  substantial  additional losses
over at least the next several  years due to, among other  factors,  the need to
expend  substantial  amounts on its continuing  clinical  trials and anticipated
research and development activities and the general and administrative  expenses
associated with those  activities.  The Company has not commercially  introduced
any product and its products are in varying stages of  development  and testing.
The Company's ability to attain  profitability will depend upon, inter alia, its
ability to develop  products  that are  effective and  commercially  viable,  to
obtain  regulatory  approval for the manufacture and sale of its products and to
license or otherwise market its products successfully. There can be no assurance
that the Company  will ever  achieve  profitability  or that  profitability,  if
achieved, can be sustained on an ongoing basis.

     Early  Stage of Product  Development;  Uncertainties  of  Clinical  Trials;
Unproven  Safety and Efficacy.  The Company's  products are in an early stage of
development.  In order to achieve  profitable  operations on a continuing basis,
the Company,  alone or in collaboration with others, must successfully  develop,
manufacture,  introduce  and market its  products.  The time frame  necessary to
bring a product to market is long and uncertain.  The products  currently  under
development  by the Company will  require  significant  additional  research and
development and extensive  preclinical and clinical testing prior to application
for   commercial   use.  A  number  of  companies  in  the   biotechnology   and
pharmaceutical industries have suffered significant setbacks in clinical trials,
even after showing promising results in earlier studies or trials.  Although the
Company  has  obtained  favorable  results to date in  preclinical  studies  and
clinical  trials of certain of its products,  such results may not be indicative
of results  that will  ultimately  be obtained in or  throughout  such  clinical
trials, and there can be no assurance that clinical testing will show any of the
Company's  products  to be safe or  efficacious.  Additionally,  there can be no
assurance  that the Company will not encounter  problems in its clinical  trials
that will cause the Company to amend, delay, suspend or terminate those clinical
trials.  There can also be no assurance  that the Company's  research or product
development efforts or those of its collaborative  partners will be successfully
completed, that any compounds currently under development by the Company will be
successfully  developed into drugs, or that any products will receive regulatory
approval on a timely basis, if at all. If any such problems  occur,  the Company
could be materially and adversely affected.

     Need for Additional  Funds;  Uncertainty of Future  Funding.  The Company's
operations to date have consumed substantial amounts of cash. Negative cash flow
from the  Company's  operations  is expected to continue and even to  accelerate
over at least the next several years. The Company's  capital  requirements  will
depend on numerous factors,  including:  the progress of preclinical testing and
clinical  trials;  the  progress  of  the  Company's  research  and  development
programs;  the time and costs  required  to  obtain  regulatory  approvals;  the
resources  devoted to  manufacturing  methods  and  advanced  technologies;  the
ability to obtain licensing arrangements;  the cost of filing,  prosecuting and,
if necessary,  enforcing patent claims; the cost of commercialization activities
and  arrangements;  and  the  demand  for the  Company's  products  if and  when
approved.  The  Company  will  have to  raise  substantial  additional  funds to
complete  development  of any product or bring  products to market.  Issuance of
additional equity securities by the Company, for these or other purposes,  could
result in dilution to then existing stockholders. There can be no assurance that
additional  financing  will be  available  on  acceptable  terms,  if at all. If
adequate  funds are not  available  on  acceptable  terms,  the  Company  may be
required  to  delay,  scale  back  or  eliminate  one or  more  of  its  product
development  programs or obtain funds through  arrangements  with  collaborative
partners or others that may require the Company to relinquish  rights to certain
of its technologies or products that the Company would not otherwise relinquish,
which may have a material adverse effect on the Company.

     Dependence  on  Others  for  Clinical  Development  and  Manufacturing  and
Marketing.  The  Company  has  limited  experience  in  drug  development,   the
regulatory approval process,  manufacturing and marketing. Other than Dr. Ronald
W. Pero,  Ph.D., the Company's Chief Scientific  Officer,  and Bjorn Nordenvall,
M.D. and Ph.D., the Company's Chief Executive  Officer,  Chairman and President,
the  Company  does not  directly  employ  any  scientists  or  other  laboratory
personnel and all of its preclinical tests and clinical trials are subcontracted
to and  performed  at the  University  of Lund,  Sweden and at other  centers in
Europe and the United  States,  with the  assistance of research and  consulting
firms.  Accordingly,  OXiGENE  has  depended,  and in the  future  is  likely to
continue to depend, on others for assistance in many areas,  including research,
conducting  preclinical  testing and clinical  trials,  the regulatory  approval
process,  manufacturing  and  marketing.  Although  the  Company  considers  its
relations  with  existing  collaborative  partners to be  satisfactory,  all its
current arrangements are short term in nature. Funding requirements, competitive
factors or  prioritization  of other  opportunities may lead the Company to seek
additional  arrangements with third parties.  While OXiGENE is likely to explore
license and development opportunities for its technologies with other companies,
there can be no assurance  that the Company will be successful  in  establishing
and maintaining  collaborative  agreements or licensing  arrangements;  that any
collaborative   partner  will  not  be  pursuing  alternative   technologies  or
developing  alternative  compounds  either on its own or in  collaboration  with
others,  directed at the same  diseases as those  involved in its  collaborative
arrangements with the Company; that any such collaborative  partners will devote
resources to the Company's technologies or compounds on a basis favorable to the
Company;  that any such arrangements  will be on terms favorable to OXiGENE;  or
that,   if   established,   such  future   licensees   will  be   successful  in
commercializing products.  Finally, if the Company's collaboration  arrangements
are  terminated  prior to  their  expiration  or if the  other  parties  to such
arrangements  fail  to  adequately  perform,  there  can  be no  assurance  that
submission of product  candidates for  regulatory  approval will not be delayed.
See information in the Annual Report under the caption  "Business--Research  and
Development and Collaborative Arrangements",  which is incorporated by reference
herein.

     Clinical  Trials;  Government  Regulation  and Health Care Reform;  Managed
Care. The Company's research and development activities, preclinical testing and
clinical trials, and the manufacturing and marketing of its products are subject
to  extensive  regulation  by numerous  governmental  authorities  in the United
States and other  countries.  See information in the Company's  Annual Report in
Form  10-K  for  the  year  ended   December   31,   1997,   under  the  caption
"Business--Product  Development Government and Regulatory  Processes",  which is
incorporated by reference  herein.  Preclinical  testing and clinical trials and
manufacturing  and  marketing of OXiGENE's  products are and will continue to be
subject to the  rigorous  testing and  approval  processes  of the Food and Drug
Administration,  the Swedish  Medical  Products  Agency and other  corresponding
foreign  regulatory  authorities.  Clinical  testing and the regulatory  process
generally take many years and require the expenditure of substantial  resources.
In  addition,  delays or  rejections  may be  encountered  during  the period of
product  development,  clinical  testing  and  FDA  regulatory  review  of  each
submitted  application.  Similar  delays  may  also be  encountered  in  foreign
countries.   There  can  be  no  assurance   that,  even  after  such  time  and
expenditures, regulatory approval will be obtained for any products developed by
OXiGENE or that a product, if approved in one country, will be approved in other
countries.   See   information   in  the  Annual   Report   under  the   caption
"Business--Product  Development Government and Regulatory  Processes",  which is
incorporated by reference herein.  Moreover, if regulatory approval of a product
is granted, such approval may entail limitations on the indicated uses for which
that  product may be  marketed.  Further,  even if such  regulatory  approval is
obtained, a marketed product, its manufacturer and its manufacturing  facilities
are subject to continual review and periodic inspections, and later discovery of
previously unknown problems (such as previously  undiscovered side effects) with
a product,  manufacturer or facility may result in restrictions on such product,
manufacturer  or facility,  including a possible  withdrawal of the product from
the market.  Failure to comply with the applicable regulatory  requirements can,
among  other  things,  result in fines,  suspensions  of  regulatory  approvals,
product recalls,  operating restrictions,  injunctions and criminal prosecution.
Additionally,  further  government  regulation  may be  established  which could
prevent or delay regulatory  approval of the Company's  products.  Further,  the
U.S. Congress continues to debate various health care reform proposals which, if
adopted, may have a material adverse effect on the Company. Moreover,  continued
cost control  initiatives by health care maintenance  organizations  and similar
programs may affect the financial  ability and willingness of patients and their
health care providers to utilize certain therapies.

     Competition and Risk of Technological Obsolescence.  The Company is engaged
in a rapidly evolving field.  Competition from other  pharmaceutical  companies,
biotechnology  companies and research and academic  institutions  is intense and
expected  to  increase.   Many  of  those   companies  and   institutions   have
substantially greater financial, technical and human resources than the Company.
Those companies and institutions also have  substantially  greater experience in
developing  products,  in conducting  clinical trials,  in obtaining  regulatory
approval  and  in   manufacturing   and   marketing   pharmaceutical   products.
Accordingly,  competitors may succeed in obtaining regulatory approval for their
products  more  rapidly  than  the  Company.  The  Company  also  competes  with
universities  and other research  institutions  in the  development of products,
technologies and processes.  Competitors have developed or are in the process of
developing  technologies  that  are,  or in the  future  may be,  the  basis for
competitive  products.  Some of those  products  may have an entirely  different
approach or means of accomplishing the desired  therapeutic effect than products
being  developed by the Company.  See information in the Annual Report under the
caption  "Competition." There can be no assurance that the Company's competitors
will not succeed in developing technologies and products that are more effective
and/or cost  competitive than those being developed by the Company or that would
render the Company's  technology and products less competitive or even obsolete.
In  addition,  one or more of the  Company's  competitors  may  achieve  product
commercialization  or patent  protection  earlier than the Company,  which could
materially adversely affect the Company.

     Dependence  on  Patents  and  Proprietary  Technology.  To date,  OXiGENE's
principal  products,  Sensamide(TM)  and  Neu-Sensamide(TM),  have been based on
certain available compounds that are produced by others. The Company anticipates
that products it develops hereafter may include or be based on the same or other
compounds  owned or  produced  by  unaffiliated  parties,  as well as  synthetic
compounds  it  may  discover.  Although  the  Company  expects  to  seek  patent
protection  for any  compounds  it  discovers  and/or for any  specific  uses it
discovers for new or previously known compounds,  there is no assurance that any
or all of them will be subject to  effective  patent  protection.  Further,  the
development  of  regimens  for  the  administration  of  pharmaceuticals,  which
generally  involve  specifications  for the  frequency,  timing  and  amount  of
dosages, has been, and the Company believes may continue to be, important to the
Company's efforts, although those processes, as such, may not be patentable.

     The  Company's  success  will  depend,  in part,  on its  ability to obtain
patents,  protect  its trade  secrets  and  operate  without  infringing  on the
proprietary  rights of others.  As of July 16, 1998, the Company is the assignee
of four granted U.S.  patents,  seven pending U.S. patent  applications,  and of
granted  patents  and/or  pending   applications  in  other  countries   (and/or
international  applications  designating other countries) corresponding to three
of the  granted  U.S.  patents  and five of the pending  U.S.  applications.  In
addition,  the  Company  will  be the  assignee  of  international  and  foreign
counterparts of the other two pending U.S. applications,  which counterparts are
expected  to be  filed  within  the  next 12  months.  The  patent  position  of
pharmaceutical  and  biotechnology  companies  like OXiGENE  generally is highly
uncertain and involves complex legal and factual questions, resulting in both an
apparent  inconsistency  regarding the breadth of claims allowed in U.S. patents
and general  uncertainty as to their legal  interpretation  and  enforceability.
Accordingly,  there can be no assurance that the Company's  patent  applications
will result in patents  being issued,  that any issued  patents will provide the
Company with competitive protection or will not be challenged by others, or that
the  patents  of others  will not have an adverse  effect on the  ability of the
Company to do business.  Moreover,  since some of the basic research relating to
one or more of the Company's patent applications and/or patents was performed at
various universities and/or funded by grants,  particularly in Sweden, there can
be no assurance that one or more  universities,  employees of such  universities
and/or  grantors will not assert that they have certain  rights in such research
and any  resulting  products,  although  the  Company  is not  aware of any such
assertions or any basis  therefor.  Furthermore,  there can be no assurance that
others will not independently  develop similar products,  will not duplicate any
of the  Company's  products or, if patents are issued to the  Company,  will not
design around such patents.  In addition,  the Company may be required to obtain
licenses to patents or other  proprietary  rights of others. No assurance can be
given that any licenses  required under any such patents or  proprietary  rights
would be made  available on terms  acceptable to the Company,  if at all. If the
Company  does not obtain such  licenses,  it could  encounter  delays in product
market  introductions  while it attempts to design around such patents, or could
find  that the  development,  manufacture  or sale of  products  requiring  such
licenses is foreclosed.  In addition,  the Company could incur substantial costs
in defending itself in suits brought against it or in connection with patents to
which it holds a license  or in  bringing  suit to  protect  the  Company's  own
patents  against   infringement.   The  Company  generally  requires  employees,
Scientific  Advisory  Board  members  and  the  institutions  that  perform  its
preclinical  and clinical tests (though not the employees of such  institutions)
to enter into  confidentiality  agreements  with the Company.  Those  agreements
provide  that  all  confidential  information  developed  or made  known  to the
individual  during the course of the relationship with the Company is to be kept
confidential  and not to be  disclosed  to third  parties,  except  in  specific
circumstances.  In the case of employees,  the agreements  also provide that all
inventions  conceived by such employees  shall be the exclusive  property of the
Company.  There  can be no  assurance,  however,  that any such  agreement  will
provide  meaningful   protection  for  the  Company's  trade  secrets  or  other
confidential  information in the event of unauthorized use or disclosure of such
information.   See   information   in  the  Annual   report  under  the  caption
"Business--Patents and Trade Secrets."

     Dependence  on Certain  Officers  and  Directors  and  Others.  The Company
believes  that its  success  is,  and will  likely  continue  to be,  materially
dependent  upon its  ability to retain the  services  of certain of its  current
officers and directors,  particularly Dr. Bjorn Nordenvall,  its Chief Executive
Officer,  Chairman and  President,  and Dr.  Ronald Pero,  its Chief  Scientific
Officer.  The loss of the  services  of any of these  individuals  could  have a
material adverse effect on the Company. In addition, the Company has established
relationships   with   universities,   hospitals   and  research   institutions,
particularly  the  University of Lund,  Lund,  Sweden,  which have  historically
provided,  and  continue  to  provide,  the  Company  with  access  to  research
laboratories,  clinical trials, facilities and patients. Dr. Pero is a Professor
of  Molecular  Ecogenetics  at the  University  of Lund.  The  Company  benefits
indirectly  from certain  research  grants  received by Dr. Pero. The Company is
materially dependent on the research and development efforts of Dr. Pero and his
various relationships and affiliations,  the loss of which could have a material
adverse effect on the Company's  business.  Additionally,  the Company  believes
that it may, at any time and from time to time, be  materially  dependent on the
services of consultants and other unaffiliated third parties.

     Product  Liability  Exposure;  Limited Insurance  Coverage.  The use of the
Company's products in clinical trials and for commercial  applications,  if any,
may expose the Company to liability  claims,  in the event such  products  cause
injury,  disease  or result  in  adverse  effects.  These  claims  could be made
directly by health care institutions,  contract laboratories, patients or others
using such  products.  Although  the Company has  obtained  liability  insurance
coverage for its ongoing  clinical  trials,  there can be no assurance that such
coverage will be in amounts  sufficient to protect the Company against claims or
recalls that could have a material adverse effect on the financial condition and
prospects of the Company.  Further, adverse product and similar liability claims
could negatively impact the Company's  ability to obtain or maintain  regulatory
approvals for its technology and products.

     Price  Volatility of the Common Stock. The market price of the Common Stock
has been,  and likely will continue to be, highly  volatile as frequently is the
case  with  the  publicly-traded   securities  of  pharmaceutical  research  and
development companies. Factors such as results of clinical trials, announcements
of  research  developments  and results by the  Company or its  competitors  and
government regulatory action affecting the Company's products in both the United
States and foreign  countries  have had, and may continue to have, a significant
effect on the Company's business and on the market price of the Common Stock. As
of March 31, 1998, an aggregate of 49,612 Stock  appreciation  rights  ("SARs"),
with a weighted  average  exercise  price of $7.19 per SAR,  had been granted to
certain clinical  investigators and consultants.  The Company is not required to
make any cash  payments  upon  exercise  of any such SAR. If and when the spread
between the market price of the Company's Common Stock and the exercise price of
the SARs changes,  the charge for financial  reporting  purposes to research and
development will be adjusted to reflect an increase or decrease, as the case may
be,  in  the  market  price  of  the  Company's   Common  Stock.   In  addition,
substantially  all of the  shares of Common  Stock  issuable  upon  exercise  of
outstanding options, SARs and warrants have been registered and may be sold from
time to time  hereafter.  Such sales, as well as future sales of Common Stock by
existing stockholders, or the perception that sales could occur, could adversely
affect the market  price of the Common  Stock.  The price and  liquidity  of the
Common Stock may also be  significantly  affected by trading activity and market
factors  related to the Nasdaq  and  Stockholm  Stock  Exchange  markets,  which
factors and the effects thereof may differ between those markets.

     No Dividends.  The Company has not declared or paid dividends on its Common
Stock since its inception and does not intend to declare or pay any dividends to
its stockholders in the foreseeable future.

     Year 2000  Compliance.  Many currently  installed  computer systems are not
capable of  distinguishing  21st  century  dates from 20th century  dates.  As a
result,  in less than two years,  the computer systems and software used by many
companies  may need to be updated to comply with such "Year 2000"  requirements.
The Company believes its accounting and management  information systems are Year
2000  compliant.  The ability of third  parties with whom the Company  transacts
business  to  address  adequately  their  Year 2000  compliance  is  beyond  the
Company's control.  The failure of such third parties to address adequately Year
2000 compliance could have a material adverse effect on the Company's  business,
results of operations and financial conditions.


                              PLAN OF DISTRIBUTION

     Shares  of Common  Stock  will be  issued  upon  exercise  of  Warrants  as
evidenced by the  surrender of the Warrant  certificate  or  certificates  on or
prior to the  expiration  date of such Warrants at the offices of American Stock
Transfer & Trust Company, as warrant agent (the "Warrant Agent"),  with the form
of  "Election  to  Purchase"  on the  reverse  side of the  Warrant  certificate
completed and executed as indicated, accompanied by payment of the full exercise
price for each Warrant being exercised.  No soliciting agent has been engaged by
the Company for the purpose of soliciting the exercise of the Warrants.


                                INFORMATION AGENT

     The  Company  has  engaged  the  services  of  Innisfree  M&A  Incorporated
("Innisfree")  to  serve as  information  agent  for the  purpose  of  answering
inquiries  from holders of Warrants.  Additional  copies of this  Prospectus may
also be obtained from Innisfree. Innisfree's address and telephone number are:

                           Innisfree M&A Incorporated
                           501 Madison Avenue, 20th Floor
                           New York, NY  10022
                           (888) 750-5834 in the U.S. or
                           (212) 750-5834 from outside the U.S.


                 CERTAIN U.S. FEDERAL INCOME TAX CONSIDERATIONS

     The  following  is a summary  of the  principal  U.S.  federal  income  tax
considerations  relevant to a holder of Warrants in connection with the adoption
of the  Amendments  and the  ownership,  disposition  and exercise or lapse of a
Warrant following  adoption of the Amendments.  This summary deals only with the
beneficial owner of a Warrant that is for U.S. federal income tax purposes (i) a
citizen or resident of the United  States,  (ii) a  corporation,  partnership or
other  business  entity  created or organized in or under the laws of the United
States or any State or political  subdivision thereof (including the District of
Columbia),  (iii) an estate  the  income of which is  subject  to United  States
federal income taxation  regardless of its source,  or (iv) a trust with respect
to  which a  court  within  the  United  States  is  able  to  exercise  primary
supervision over its administration,  and one or more United States persons have
the  authority  to  control  all of its  substantial  decisions  (each,  a "U.S.
Holder").

     This discussion is based on interpretations of the Internal Revenue Code of
1986, as amended (the "Code"),  regulations issued  thereunder,  and rulings and
decisions  currently  in effect  (or in some cases  proposed),  all of which are
subject  to  change.  Any  such  change  may be  applied  retroactively  and may
adversely affect the U.S. federal income tax consequences described herein.

     This summary does not purport to be a  comprehensive  description of all of
the tax  considerations  that may be relevant in respect of the  adoption of the
Amendments or a decision to hold,  buy,  sell,  exercise or let lapse a Warrant.
This summary  addresses only U.S. Holders that own Warrants and any Common Stock
received upon exercise thereof as capital assets and does not discuss all of the
tax  consequences  that may be relevant to particular  investors or to investors
subject to special  treatment  under the U.S.  federal  income tax laws (such as
insurance  companies,   financial  institutions,   retirement  plans,  regulated
investment companies, securities dealers, or investors whose functional currency
is not the U.S.  dollar),  and  persons  that will  hold a Warrant  as part of a
"straddle"  or  "conversion  transaction"  for  federal  income tax  purposes or
otherwise  as part of an  integrated  transaction.  No ruling from the  Internal
Revenue  Service ("IRS") will be sought with respect to the Warrants and the IRS
could take a contrary view with respect to the matters described below.

ALL HOLDERS OF THE  WARRANTS  SHOULD  CONSULT  THEIR TAX ADVISORS AS TO THE U.S.
FEDERAL,  STATE, LOCAL AND OTHER TAX CONSEQUENCES TO THEM OF THE ADOPTION OF THE
AMENDMENTS,  THE OWNERSHIP,  DISPOSITION  AND EXERCISE OR LAPSE OF THE WARRANTS,
AND OF THE OWNERSHIP OF ANY COMMON STOCK RECEIVED UPON EXERCISE OF THE WARRANTS.

Adoption of the Amendments

     A U.S. Holder generally should not recognize gain or loss upon the adoption
of the Amendments, should have a tax basis in the Warrants after the adoption of
the Amendments (the "Amended Warrants") equal to that U.S. Holder's tax basis in
the  Warrants  prior  to the  adoption  of the  Amendments  (the  "Pre-Amendment
Warrants"),  and  should  have a holding  period in the  Amended  Warrants  that
includes that U.S. Holder's holding period in the Pre-Amended Warrants. However,
if the Company pays a dividend or makes a distribution  to its  shareholders  or
holders  of  warrants  (other  than  the  Warrants),  or  pays  interest  on any
convertible  debt  that  may be  outstanding,  each  within  a 36  month  period
beginning on the effective  date of the adoption of the Amendments or subsequent
to such 36 month period if pursuant to a plan,  the  adoption of the  Amendments
could be treated as a taxable distribution.  The Company does not anticipate the
payment of  dividends  or any other such  distributions  or payments  within the
36-month  period  beginning  on  the  effective  date  of  the  adoption  of the
Amendments and does not plan otherwise to make such a distribution or payment.

     Under section 305(c) of the Code, certain adjustments to the exercise price
of the Amended Warrants or the number of shares of Common Stock purchasable upon
exercise of the Amended Warrants that occur pursuant to the terms of the Amended
Warrants could result in a deemed distribution to U.S. Holders or to the holders
of Common  Stock,  which  could be  taxable  to such U.S.  Holders or holders of
Common Stock.

Sale, Exchange, or Redemption of Amended Warrant

     A sale, exchange, or redemption of an Amended Warrant will generally result
in taxable gain or loss equal to the difference  between the amount realized and
the U.S.  Holder's tax basis in the Amended  Warrant.  Such gain or loss will be
long-term  capital  gain or loss if the  U.S.  Holder's  holding  period  in the
Amended  Warrant  exceeds  one  year.  In the  case of a U.S.  Holder  that is a
noncorporate taxpayer, any such long-term capital gain will generally be subject
to U.S.  federal  income tax at a maximum  rate of (i) 20%, if the  noncorporate
U.S.  Holder's  holding period in respect of the Amended Warrant is more than 18
months at the time of such  disposition,  or (ii) 28%, if the noncorporate  U.S.
Holder's holding period in respect of the Amended Warrant is more than one year,
but not more than 18 months,  at the time of such  disposition.  Certain pending
legislation  would reduce the holding  period for the maximum 20% rate from more
than 18 months  to more than one year.  The  ability  to use  capital  losses to
offset ordinary income in determining taxable income generally is limited.

Exercise of Amended Warrant

     In  general,  no gain or loss will be  recognized  on the receipt of Common
Stock pursuant to an exercise of an Amended Warrant, except to the extent a U.S.
Holder  receives cash in lieu of fractional  shares of stock.  The tax basis for
the Common Stock  received  upon such  exercise  will be equal to the sum of the
U.S. Holder's tax basis in the Amended Warrant exercised (reduced by the portion
of such tax  basis  allocable  to any  fractional  shares  paid in cash) and the
exercise price.  The holding period for any Common Stock received on exercise of
an Amended Warrant will begin on the date the Amended Warrant is exercised.

Lapse of Amended Warrant

     If an Amended  Warrant lapses  unexercised,  the U.S. Holder will recognize
loss in an amount equal to the U.S.  Holder's tax basis in the Amended  Warrant.
Such loss will be long-term  capital loss if the U.S.  Holder's  holding  period
exceeds one year.

Sale, Exchange, or Redemption of Common Stock Received on Exercise of Amended
Warrant

     A sale, exchange, or redemption of Common Stock received on the exercise of
an Amended  Warrant  generally  will result in taxable gain or loss equal to the
difference  between the amount  realized and the U.S.  Holder's tax basis in the
Common  Stock.  Such gain or loss will be long-term  capital gain or loss if the
U.S.  Holder's  holding period in the Common Stock exceeds one year. In the case
of a U.S.  Holder that is a noncorporate  taxpayer,  any such long-term  capital
gain will  generally be subject to U.S.  federal income tax at a maximum rate of
(i) 20%, if the  noncorporate  U.S.  Holder's  holding  period in respect of the
Common  Stock is more than 18 months  at the time of such  disposition,  or (ii)
28%, if the noncorporate  U.S.  Holder's holding period in respect of the Common
Stock is more than one year,  but not more than 18  months,  at the time of such
disposition. Certain pending legislation would reduce the holding period for the
maximum 20% rate from more than 18 months to more than one year.  The ability to
use capital  losses to offset  ordinary  income in  determining  taxable  income
generally is limited.

Backup Withholding

     A U.S.  Holder may be subject to backup  withholding tax at the rate of 31%
with  respect to  dividends  paid on or the  proceeds  of a sale,  exchange,  or
redemption of a share of Common Stock or an Amended Warrant unless (i) such U.S.
Holder is a corporation  or comes within  certain other exempt  categories  and,
when required, demonstrates this fact or (ii) provides a taxpayer identification
number,  certifies  as to no loss of  exemption  from  backup  withholding,  and
otherwise complies with applicable backup  withholding  rules. The Company,  its
agent,  a broker or a paying  agent,  as the case may be,  will be  required  to
deduct and withhold any such backup  withholding tax. Backup  withholding is not
an additional tax and may be credited against the taxpayer's U.S. federal income
tax liability, provided that the required information is furnished.


                            DESCRIPTION OF SECURITIES

     Common  Stock.  The Company is  authorized  to issue  60,000,000  shares of
Common Stock,  par value $.01 per share,  of which  10,204,049  shares of Common
Stock are  outstanding  as of July 6,  1998.  The  holders  of Common  Stock are
entitled to one vote for each share held of record on all matters to be voted on
by stockholders.  There is no cumulative  voting with respect to the election of
directors.  As a consequence,  the holders of more than 50% of the shares voting
for the election of directors can elect all the directors.  The By-Laws  provide
that only a majority of the issued and  outstanding  shares of Common Stock need
to be  represented  for a quorum,  and to transact  business at a  stockholders'
meeting.  The holders of Common Stock are entitled to receive dividends when, as
and if declared by the Board of  Directors  out of the funds  legally  available
therefor.  The Company has no present plans to pay dividends with respect to the
shares of Common Stock. In the event of liquidation,  dissolution or the winding
up of the Company,  the holders of Common Stock are entitled to share ratably in
all assets remaining available for distribution after payment of liabilities and
after provision has been made for each class of stock, if any, having preference
over the Common  Stock.  Holders  of shares of Common  Stock,  as such,  have no
conversion, preemptive or other subscription rights, and there are no redemption
provisions  applicable to the Common Stock. All the outstanding shares of Common
Stock are, and the shares of Common Stock  underlying the Warrants,  when issued
in accordance  with the terms of the Warrants,  will be, validly  authorized and
issued, fully paid and nonassessable.

     Warrants.  In August 1993, the Company completed an initial public offering
of 1,605,000  Units (the  "Units").  Each Unit  consisted of one share of Common
Stock,  par value  $.01 per share  (the  "Common  Stock"),  and one  Warrant  to
purchase  one share of Common Stock (the  "Warrants").  The Common Stock and the
Warrants included in the Units became separately transferable on August 26, 1993
(the  "Separation  Date").  The Warrant  Agreement,  dated  August 26, 1993 (the
"Warrant  Agreement"),  between the Company and the Warrant  Agent,  pursuant to
which the Warrants were issued  provides  that each Warrant  entitles the holder
thereof to purchase one share of Common Stock for $7.00 during the first year of
exercisability  ending on the first anniversary of the Separation Date, with the
exercise price thereafter  increasing by $2.00 on each annual anniversary of the
Separation  Date.  The Warrant  exercise  price is subject to  adjustment in the
event of the occurrence of certain  events,  including  stock  dividends,  stock
splits,  mergers and  reclassifications  (the "Antidilution  Provisions").  As a
result  of the  Antidilution  Provisions,  the  current  exercise  price of each
Warrant is $14.35.

     On August 29, 1994,  the Company and the Warrant  Agent amended the Warrant
Agreement  to  provide  that,  for a  period  of 65 days  from  the  date of the
Prospectus  related thereto (the "Reduced Exercise Price Period"),  each Warrant
would  entitle the  registered  holder  thereof to purchase  one share of Common
Stock,  at a price of $7.00 per  share.  From and  after the end of the  Reduced
Exercise  Price  Period and until August 26,  1995,  the  exercise  price of the
Warrants was $9.00 per share,  with the exercise  price  increasing  by $2.00 on
each annual anniversary of the Separation Date thereafter. Unless exercised, the
Warrants were automatically set to expire under the current Warrant Agreement at
5:00 p.m. New York City time on August 26, 1998.

     The holders of the Warrants  have no right to vote on matters  submitted to
the stockholders of the Company,  have no right to receive  dividends,  and have
none of the other rights conferred upon stockholders of the Company. The holders
of the  Warrants  are not  entitled to share in the assets of the Company in the
event of liquidation, dissolution or the winding up of the Company's affairs.

     On July 8, 1998,  the  Company and the  Warrant  Agent  amended the Warrant
Agreement  to provide  that (a) at 5:00  p.m.,  New York City time on August 26,
1998,  with no action  required to be taken by the holders of the Warrants,  the
Original  Expiration  Date will be extended (the  "Extension") to 5:00 p.m., New
York City time,  December 31, 1999 (the  "Amended  Expiration  Date"),  (b) each
Warrant shall be exercisable on and after August 26, 1998, and until the Amended
Expiration Date, for 1.07 shares of Common Stock at a price of $14.35 (i.e., the
exercise price currently in effect), subject only to the Antidilution Provisions
(the  "Price  Amendment"),  and  (c) the  Company  has  the  right,  but not the
obligation,  at any time after the Original  Expiration Date, to redeem,  at any
time or from time to time, any or all of the Warrants (the "Call" and,  together
with  the  Extension  and the  Price  Amendment,  the  "Amendments");  provided,
however, the Company may exercise the Call only if (i) the average trading price
of the shares of the Company's  Common Stock, as reported by the National Market
of The Nasdaq Stock Market, Inc.  ("Nasdaq"),  for any period of ten consecutive
trading  days (not  including  any days on which the Nasdaq is open for trading,
but there are no  purchases  or sales of Common  Stock),  has traded at not less
than  $16.00 per  share,  and (ii) the  Company  has given not less than 20 days
written notice to the holders of Warrants  indicating the Company's  election to
exercise the Call.  Following a Call,  any Warrants that were called that remain
unexercised  at the end of the 20-day  notice  period will be redeemed  promptly
thereafter at a redemption price of $.001 per Warrant, payable by the Company in
cash.

     The  holders  of  Warrants  need  take no  action  in  connection  with the
Amendments to the Warrant  Agreement,  which apply to all outstanding  Warrants.
The  holders  of  Warrants  need not  turn in the  certificates  evidencing  the
Warrants   that  do  not  reflect  the   Amendments   (the   "Original   Warrant
Certificates")  even after the  Original  Expiration  Date.  However,  after the
Original  Expiration  Date,  any holders of Warrants has the right,  but not the
obligation,  at its election,  to surrender Original Warrant Certificates to the
Warrant  Agent which will  thereupon be replaced  with  certificates  evidencing
Warrants  containing the Amendments  (the "Revised  Warrant  Certificates").  In
addition,  after the Original Expiration Date, Revised Warrant Certificates will
be issued in connection with (a) any transfer of Warrants  evidenced by Original
Warrant Certificates or (b) a partial exercise of Warrants evidenced by Original
Warrant Certificates.


                                 USE OF PROCEEDS

     The  Company  will  use  the  net  proceeds  of any  exercise  of  Warrants
(approximately  $12,118,322 if all Warrants are exercised,  after  deducting the
expenses of this offering  estimated to be $39,500,  all of which are payable by
the  Company)  to finance  its  ongoing  clinical  trials for drugs and  assays,
regulatory  applications,  research  and  development  and  working  capital and
general corporate purposes.  The exact allocation of the net proceeds for any of
such  purposes  and the  timing of such  expenditures  will  depend  on  various
factors, including primarily the exact number of Warrants exercised at any given
time,  the Company's  timing of its regulatory  applications  and the timing and
results of research and development activities. The net proceeds of the exercise
of the Warrants may also be used to finance  OXiGENE's  participation in certain
research  and  development  projects  with third  parties  or to acquire  new or
additional   technologies  or  companies  that  complement  OXiGENE's  business,
although no such transactions are presently being discussed or negotiated.

     The Company anticipates that it may need additional  financing to carry out
its activities  until such time as (i) it can  commercialize  its  technologies,
either through  licensing  arrangements or through the sale of products based on
its  technology,  and (ii)  revenues  from  such  commercial  activities  become
sufficient  to cover the  Company's  expenditures.  The amount and timing of the
Company's  financing  requirements is highly uncertain,  and no guarantee can be
given that  additional  financing  will be available on terms  acceptable to the
Company, if at all.

     Pending  application of the net proceeds of this offering in the manner set
forth  above,   the  Company  will  invest  the  net  proceeds  in   short-term,
interest-bearing  obligations  issued by the U.S.  Government,  its  agencies or
instrumentalities.


                      MARKET FOR REGISTRANT'S COMMON EQUITY
                         AND RELATED STOCKHOLDER MATTERS

     Effective  November  19,  1996,  the  Company's  Common  Stock and Warrants
commenced trading on Nasdaq under the symbols "OXGN" and "OXGNW,"  respectively.
Prior thereto,  since the completion of the Company's initial public offering in
August  1993,  the  Company's  securities  had been listed for  quotation on the
Nasdaq Small-Cap Market. The Company's shares of Common Stock are also traded on
the Stockholm Stock Exchange in Sweden.  The following table sets forth the high
and low per share and per  warrant  prices for the  Company's  Common  Stock and
Warrants for each quarterly period within the two most recent fiscal years.

                                         Common Stock        Warrants

Calendar Year                           High     Low       High      Low

1996
First Quarter                          $23.38   $ 9.25    $15.50   $ 2.88
Second Quarter                          32.63    17.63     24.00    10.25
Third Quarter                           27.00    17.00      8.00     8.63
Fourth Quarter                          26.70    22.00     15.50    11.00

1997
First Quarter                          $36.25   $22.63    $26.25   $12.25
Second Quarter                          35.00    26.25     25.25    15.56
Third Quarter                           41.88    24.00     29.25    15.25
Fourth Quarter                          29.25    15.25     18.50     6.50

1998
First Quarter                          $18.75   $14.25     $9.38    $5.00
Second Quarter                          19.88     9.50      7.00     2.38
Third Quarter (through July 6, 1998)    12.88    11.75      3.00     2.50

     On July 6, 1998, the last sale price for the Warrants was $2.50 per Warrant
and the last sale  price for the Common  Stock was  $11.8125  per share,  all as
reported by Nasdaq.

     As of July 6, 1998, there were 41 holders of record of the Company's Common
Stock  and  three  holders  of record of the  Company's  Warrants.  The  Company
believes,  based  on the  number  of  proxy  statements  and  related  materials
distributed  in connection  with its 1997 Annual Meeting of  Stockholders,  that
there are more than 9,000 beneficial owners of its Common Stock.

     The Company has not declared  any cash  dividends on its Common Stock since
its  inception  in 1988,  and  does not  intend  to pay  cash  dividends  in the
foreseeable future. The Company presently intends to retain future earnings,  if
any, to finance the growth and development of its business.


                              AVAILABLE INFORMATION

     The Company is subject to the informational  requirements of the Securities
Exchange  Act of 1934,  as  amended  (the  "Exchange  Act"),  and in  accordance
therewith files reports,  proxy and information statements and other information
with the Securities and Exchange Commission (the "SEC"). Copies of such reports,
proxy and  information  statements  and other  information  can be inspected and
copied at the public  reference  facilities  maintained  by the SEC at Judiciary
Plaza,  450 Fifth  Street,  N.W.,  Washington,  D.C.  20549 and at the following
Regional Offices of the SEC: Suite 1400,  Northwestern  Atrium Center,  500 West
Madison  Street,  14th Floor,  Chicago,  Illinois  60661;  and Seven World Trade
Center,  13th Floor,  New York,  New York 10048.  Copies of such material can be
obtained at prescribed rates from the Public  Reference  Section of the SEC, 450
Fifth  Street,  N.W.,  Washington,  D.C.  20549.  The SEC  maintains  a Web site
(http://www.sec.gov) that contains reports, proxy and information statements and
other  information  regarding  registrants,  such  as  the  Company,  that  file
electronically with the SEC.

     The Company has filed with the SEC a  post-effective  amendment on Form S-3
to a registration  statement  originally  filed on Form S-1  (collectively,  and
together with any amendments  thereto,  the "Registration  Statement") under the
Securities Act of 1933 (the  "Securities  Act"),  with respect to the securities
that are the subject of this Prospectus (the "Prospectus"), including the shares
of  Common  Stock  underlying  the  Warrants.  This  Prospectus  is  part of the
Registration Statement and does not contain all the information set forth in the
Registration Statement,  certain portions of which have been omitted pursuant to
the  rules  and  regulations  of the SEC.  Such  additional  information  may be
obtained  from  the  SEC's  principal  office  in  Washington,  D.C.  Statements
contained in this  Prospectus  or in any document  incorporated  by reference in
this Prospectus as to the contents of any contract or other document referred to
herein or therein are not necessarily  complete,  and in each instance reference
is made to the copy of such  contract or other  document  filed as an exhibit to
the  Registration  Statement or such other  document,  each such statement being
qualified in all respects by such reference.


                            INCORPORATED BY REFERENCE

     This Prospectus  incorporates by reference  certain  documents that are not
presented  herein or delivered  herewith.  These  documents are  available  upon
request from Mr. David  Sherris,  OXiGENE,  Inc.,  One Copley Place,  Suite 602,
Boston, MA 02116, telephone (617) 536-9500.

     The Company hereby  undertakes to provide,  without charge, to each person,
including  any  beneficial  owner,  to whom a copy of this  Prospectus  is being
delivered,  upon the written or oral request of any such  person,  a copy of any
and all of the documents referred to which are incorporated herein by reference,
other than exhibits to such  documents,  unless such  exhibits are  specifically
incorporated herein by reference. Requests for such documents should be directed
to the person indicated in the immediately preceding paragraph.

     The following documents, which have been filed with the SEC pursuant to the
Exchange Act, are hereby incorporated by reference herein:

     (a) OXiGENE's  Annual  Report on Form 10-K for the year ended  December 31,
1997 (including all amendments thereto) (the "Annual Report").

     (b)  OXiGENE's  Quarterly  Reports on Form 10-Q for the quarter ended March
31, 1998 (including all amendments thereto).

     All documents  filed by OXiGENE  pursuant to Sections  13(a),  13(c), 14 or
15(d) of the Exchange Act after the date hereof and prior to the  termination of
this offering,  shall be deemed to be incorporated herein by reference and to be
a part  hereof  from the  date of  filing  of such  documents.  All  information
appearing in this Prospectus or in any document incorporated herein by reference
is not necessarily  complete and is qualified in its entirety by the information
and financial  statements  (including notes thereto)  appearing in the documents
incorporated  by  reference  herein  and  should  be  read  together  with  such
information and documents.

     Any  statement  contained  in a  document  incorporated  or  deemed  to  be
incorporated  herein by reference  shall be deemed to be modified or  superseded
for purposes of this Prospectus to the extent that a statement  contained herein
or in any other  subsequently  filed document that is deemed to be  incorporated
herein by reference modifies or supersedes such statement. Any such statement so
modified or superseded shall not be deemed, except as so modified or superseded,
to constitute a part of this Prospectus.


                                  LEGAL MATTERS

     The validity of the shares of Common Stock offered hereby and certain other
matters  will be passed upon for the Company by  Cadwalader,  Wickersham & Taft,
New York, New York.


                                     EXPERTS

     The  consolidated  financial  statements  of the Company  appearing  in the
Company's  Annual  Report (Form 10-K) for the year ended  December 31, 1997 have
been audited by Ernst & Young LLP, independent  auditors,  as set forth in their
report  thereon  included  therein and  incorporated  herein by reference.  Such
consolidated  financial  statements  are  incorporated  herein by  reference  in
reliance  upon such report  given upon the  authority of such term as experts in
accounting and auditing.


<PAGE>

     No  dealer,  salesman  or any  other  person  is  authorized  to  give  any
information  or to make  any  representations  other  than  those  contained  or
incorporated  by  reference  in this  Prospectus,  and if given  or  made,  such
information  or  representations  should  not be  relied  upon  as  having  been
authorized.  This  Prospectus  does  not  constitute  an  offer  to  sell,  or a
solicitation  of an offer to buy the  shares of  Common  Stock  offered  by this
Prospectus,  by  anyone  in any  jurisdiction  in  which  such  offer to sell or
solicitation is not authorized,  or in which the person making such offer is not
qualified to do so or to any person to whom it is unlawful to make such offer or
sell  or   solicitation.   Neither  the  delivery  of  the  Prospectus  nor  any
distribution   of  shares  pursuant  to  this   Prospectus   shall,   under  any
circumstances,  create  any  implication  that  there  has been no change in the
information set forth or  incorporated by reference  herein or in the affairs of
the Company since the date of this Prospectus.

                                TABLE OF CONTENTS

                                                                            PAGE

THE COMPANY...................................................................3

RISK FACTORS..................................................................6

PLAN OF DISTRIBUTION.........................................................10

INFORMATION AGENT............................................................11

CERTAIN U.S. FEDERAL INCOME TAX CONSIDERATIONS...............................11

DESCRIPTION OF SECURITIES....................................................13

USE OF PROCEEDS..............................................................15

MARKET FOR REGISTRANT'S COMMON EQUITY AND RELATED STOCKHOLDER MATTERS........15

AVAILABLE INFORMATION........................................................16

INCORPORATED BY REFERENCE....................................................17

LEGAL MATTERS................................................................18

EXPERTS......................................................................18



<PAGE>

                                     PART II

Item 14.  Other Expenses of Issuance and Distribution.

     The fees  and  expenses  payable  by the  Company  in  connection  with the
issuance and  distribution  of the shares of Common Stock being  registered  are
estimated as follows:

                                                                          Amount
                                                                          ------

         Accounting Fees and Expenses.........................            $3,500
         Legal Fees and Expenses..............................            32,500
         Blue Sky Filing Fees and Expenses....................             1,000
         Miscellaneous  expenses,   including  the  Information
         Agent and Warrant Agent fees and expenses............             2,500
                                                                           -----


                  Total.......................................           $39,500
                                                                         -------



Item 15.  Indemnification of Directors and Officers.

     The Company is a Delaware corporation.  Reference is made to Section 145 of
the  Delaware  General  Corporate  Law  (the  "DGCL"),  which  provides  that  a
corporation  may  indemnify any person who was or is a party or is threatened to
be made a party to any threatened,  pending or completed  legal action,  suit or
proceeding, whether civil, criminal, administrative or investigative (other than
an action by or in the  right of such  corporation),  by reason of the fact that
such  person  is or  was  an  officer,  director,  employee  or  agent  of  such
corporation,  or is or was  serving  at the  request  of such  corporation  as a
director,  officer, employee or agent of another corporation or enterprise.  The
indemnity may include expenses (including attorneys' fees), judgments, fines and
amounts paid in settlement  actually and  reasonably  incurred by such person in
connection  with  such  action,  suit  or  proceeding,  provided  such  officer,
director,  employee or agent  acted in good faith and in a manner he  reasonably
believed to be in or not opposed to the  corporation's  best  interests and, for
criminal  proceedings,  had no reasonable  cause to believe that his conduct was
unlawful.  A Delaware  corporation  may  indemnify  officers and directors in an
action by or in the right of the corporation  under the same conditions,  except
that no indemnification is permitted without judicial approval if the officer or
director  is  adjudged  to be liable to the  corporation.  Where an  officer  or
director is  successful  on the merits or otherwise in the defense or any action
referred to above,  the corporation must indemnify him against the expenses that
such officer or director actually and reasonably incurred.

     Reference  is also made to  Section  102(b)7 of the DGCL,  which  enables a
corporation  in its  certificate  of  incorporation  to  eliminate  or limit the
personal  liability  of a director for monetary  damages for  violations  of the
director's  fiduciary duty,  except (i) for any breach of the director's duty of
loyalty to the corporation or its  stockholders,  (ii) for acts or omissions not
in good faith or which involve intentional  misconduct or a knowing violation of
law,  (iii)  pursuant to Section 174 of the DGCL  (providing  for  liability  of
directors  for  unlawful  payment of dividends  or unlawful  stock  purchases or
redemptions)  or (iv) for any  transaction  from  which a  director  derived  an
improper personal benefit.

     Article IX, Section 3 of the Company By-Laws provides as follows:

          "SECTION 3.  Indemnification.  The  Corporation  shall, to the fullest
     extent  permitted by the General  Corporation Law of the State of Delaware,
     indemnify  members  of the  Board  and may,  if  authorized  by the  Board,
     indemnify its  officers,  employees and agents and any and all persons whom
     it shall have power to indemnify against any and all expenses,  liabilities
     or other matters."

                  ARTICLE  NINTH  of  the  Company's  Restated   Certificate  of
Incorporation provides as follows:

          "To the fullest extent permitted by the General Corporation Law of the
     State of  Delaware,  no director  of the  Corporation  shall be  personally
     liable to the  Corporation  or its  stockholders  for monetary  damages for
     breach of fiduciary  duty as a director,  except for  liability (i) for any
     breach  of  the  director's  duty  of  loyalty  to the  Corporation  or its
     stockholders,  (ii) for acts or omissions not in good faith or that involve
     intentional  misconduct or a knowing  violation of law, (iii) under Section
     174 of the General  Corporation  Law of the State of Delaware,  or (iv) for
     any  transaction  from  which the  director  derived an  improper  personal
     benefit.   Any  repeal  or  modification  of  this  Article  Ninth  by  the
     stockholders  of the  Corporation  shall not adversely  affect any right or
     protection  of a director of the  Corporation  existing at the time of such
     repeal or modification with respect to acts or omissions occurring prior to
     such repeal or modification."

     The  Underwriting  Agreement  dated August 26, 1993 between the Company and
RAS Securities Corp. and ABD Securities  Corporation,  as representatives of the
several underwriters named in Schedule A thereto (the "Underwriters"),  contains
provisions under which the Company and the Underwriters have agreed to indemnify
each other  (including  officers and directors of the Company)  against  certain
liabilities under the Securities Act.

     Insofar as indemnification for liabilities arising under the Securities Act
may be  permitted  to  directors,  officers or persons  controlling  the Company
pursuant to the foregoing provisions,  the Company has been informed that in the
opinion of the  Securities  and  Exchange  Commission  such  indemnification  is
against  public  policy as  expressed  in the  Securities  Act and is  therefore
unenforceable.

     The Company has entered into  indemnification  agreements  with each of its
directors and executive officers.  The Company has obtained director and officer
liability insurance.

Item 16.  Exhibits

          4.1*    Form of Warrant Agreement between the Company and American
                  Stock Transfer Trust Company as Transfer Agent and Warrant
                  Registrant    ("AST")    (including    form   of   Warrant
                  Certificate).

          4.2**   Amendment to Warrant  Agreement  dated September 19, 1994,
                  between  the  Company   and  AST   amending   the  Warrant
                  Agreement.

          4.3***  Amendment to Warrant Agreement dated July 8, 1998, between
                  the Company and AST amending the Warrant Agreement.

          5.1     Legality Opinion of Cadwalader, Wickersham & Taft.

          23.1    Consent of Ernst & Young LLP, New York, New York.

          23.2    Consent of Cadwalader, Wickersham & Taft.

          24      Power of Attorney (included on the signature page of this
                  Registration Statement).

          99.1*** Form of Letter to Holders of Warrants.

          99.2*** Form of Questions and Answers about the Amendments of the
                  Warrants.

- ------------------
         *        Incorporated by reference to the Company's Registration
                  Statement on Form S-1 (File No.
                  33-64968) and any amendments thereto.
         **       Incorporated by reference to the Company's Post-Effective
                  Amendment No. 2 on Form S-3 to Form S-1 Registration
                  Statement, dated September 30, 1994.
         ***      Previously filed.


Item 17.  Undertakings

     Insofar as indemnification for liabilities arising under the Securities Act
may be permitted to directors,  officers and controlling  persons of the Company
pursuant  to the  provisions  described  above in Item 15, the  Company has been
advised  that in the opinion of the  Securities  and  Exchange  Commission  such
indemnification  is against public policy as expressed in the Securities Act and
is,  therefore  unenforceable.  In the event  that a claim  for  indemnification
against  such  liabilities  (other  than the  payment by the Company of expenses
incurred or paid by a director,  officer or controlling person of the Company in
the  successful  defense of any action,  suit or proceeding) is asserted by such
director,  officer or controlling person in connection with the securities being
registered,  the Company  will,  unless in the opinion of its counsel the matter
has been  settled by  controlling  precedent,  submit to a court of  appropriate
jurisdiction  the  question  of whether  such  indemnification  by it is against
public  policy as  expressed in the  Securities  Act and will be governed by the
final adjudication of such issue.

                  The undersigned Company hereby undertakes:

          (1) To file,  during  any  period  in which  offers or sales are being
     made, a post-effective  amendment to this registration statement to include
     any  material  information  with  respect to the plan of  distribution  not
     previously  disclosed in the registration  statement or any material change
     to such information in the registration statement:

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

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

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

                  The undersigned Registrant hereby undertakes that:

          (1) For purposes of  determining  any liability  under the  Securities
     Act, the information  omitted from the form of prospectus  filed as part of
     this  registration  statement in reliance upon Rule 430A and contained in a
     form of prospectus  filed by the  Registrant  pursuant to Rule 424(b)(1) or
     (4) or 497(h) under the  Securities  Act shall be deemed to be part of this
     registration statement as of the time its was declared effective.

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



<PAGE>




                                   SIGNATURES

     Pursuant to the  requirements of the Securities Act of 1933, the registrant
certifies  that it has  reasonable  grounds to believe  that it meets all of the
requirements  for  filing  on Form S-3 and has  duly  caused  this  registration
statement  to be  signed  on its  behalf  by  the  undersigned,  thereunto  duly
authorized  in the City of  Stockholm,  Sweden or in the City of New  York,  New
York, on July 22, 1998.

                            OXiGENE, INC.


                            By:  /s/ Bjorn Nordenvall
                                 --------------------
                                     Bjorn Nordenvall
                                     President and Chief Executive Officer


                                POWER OF ATTORNEY

         Each person  whose  signature  appears  below  hereby  constitutes  and
appoints  Bjorn  Nordenvall  and Bo Haglund and each or either of them, his true
and  lawful  attorney-in-fact  and agent  with full  power of  substitution  and
resubstitution,  for  him  and in his  name,  place  and  stead,  in any and all
capacities (until revoked in writing), to sign any and all amendments (including
post-effective  amendments) to this registration statement and to cause the same
to be filed,  with all  exhibits  thereto  and  other  documents  in  connection
therewith, with the Securities and Exchange Commission,  hereby granting to said
attorneys-in-fact and agents, and each of them or their substitutes,  full power
and  authority  to do and  perform  each  and  every  act and  thing  whatsoever
requisite  or desirable  to be done in and about the  premises,  as fully to all
intents and  purposes  as the  undersigned  might or could do in person,  hereby
ratifying and  confirming  all acts and things that said  attorneys-in-fact  and
agents or either of them, or their substitutes or substitute, may lawfully do or
cause to be done by virtue hereof.


     Pursuant to the  requirements of the Securities  Exchange Act of 1934, this
report has been signed by the following  persons on behalf of the registrant and
in the capacities and on the dates indicated.

<TABLE>
<CAPTION>

                Signature                                 Title                                 Date

<S>                                      <C>                                                <C> 
                                         President, Chief Executive Officer                 July 22, 1998
/s/ Bjorn Nordenvall                     and Director (principal executive
- --------------------                                     officer)
Bjorn Nordenvall                                        

                                                 Chief Financial Officer                    July 22, 1998
/s/ Bo Haglund
- --------------------
Bo Haglund

                                                         Director                           July __, 1998
- --------------------
Marvin H. Caruthers

                                                         Director                           July __, 1998
- --------------------
Michael Ionata

                                                         Director                           July 22, 1998
/s/ Arthur Laffer
- --------------------
Arthur Laffer

                                                         Director                           July 22, 1998
/s/ Ronald W. Pero
- --------------------
Ronald W. Pero

                                                         Director                           July __, 1998
- --------------------
Per-Olof Soderberg

                                                         Director                           July 22, 1998
/s/ Gerald A. Eppner
 --------------------
Gerald A. Eppner
</TABLE>






                                                                     Exhibit 5.1
                                                                     -----------

                                   CADWALADER
                          Cadwalader, Wickersham & Taft

100 Maiden Lane                                                         New York
New York, NY 10038                                                    Washington
Tel: 212-504-6000                                                    Los Angeles
Fax: 212-504-6666                                                      Charlotte
                                                                          London






                                  July 6, 1998



OXiGENE, Inc.
One Copley Place
Suite 602
Boston, MA  02116

                  Re:   Shares of Common Stock
                        ----------------------

Ladies and Gentlemen:

     We have acted as counsel to  OXiGENE,  Inc.,  a Delaware  corporation  (the
"Company"),  in connection  with the  preparation  and filing of  Post-Effective
Amendment No. 3 to Registration  Statement on Form S-3 to Registration Statement
on Form S-1 (the  "Registration  Statement"),  pursuant  to  which  the  Company
proposes to register up to 847,135  shares of its Common Stock,  $0.01 par value
per share (the  "Shares"),  issuable  by the  Company  upon the  exercise of the
Warrants.  Capitalized  terms  used  but  not  defined  herein  shall  have  the
respective meanings given or ascribed thereto in the Registration Statement.

     For purposes of this letter,  we have  examined  originals or copies of the
following:

     1. The Registration  Statement,  as amended to date, in the form filed with
the Securities and Exchange Commission (the "Commission");

     2. Restated  Certificate of  Incorporation  of the Company,  as filed as an
exhibit to the Company's prior filings with the Commission;

     3. Certificate of Amendment of Certificate of Incorporation of the Company,
as filed as an exhibit to the Company's prior filings with the Commission;

     4. By-Laws of the Company,  as filed as an exhibit to the  Company's  prior
filings with the Commission;

     5. Form of Stock  Certificate  representing  shares of Common  Stock of the
Company,  as  filed  as an  exhibit  to the  Company's  prior  filings  with the
Commission;

     6.  Resolutions  of the Board of Directors of the Company  authorizing  the
filing of the Registration Statement and the amendments to the Warrant Agreement
as set forth in the Registration Statement; and

     7. Such other  documents  and records as we have  considered  necessary for
purposes of this opinion.

     We have assumed the  genuineness of the signatures on and the  authenticity
of all documents,  instruments and certificates submitted to us as originals and
the conformity to original documents,  instruments and certificates submitted to
us as  copies  and the  legal  capacity  to sign  of all  individuals  executing
documents.  We have relied on Company  records and have assumed the accuracy and
completeness  thereof. We have relied upon  representations of the Company as to
certain matters of fact relevant hereto.

     We are not  admitted  to the  practice of law in any  jurisdiction  but the
State of New York, and we express no opinion as to the laws of any  jurisdiction
other than those of the State of New York,  the federal law of the United States
of America, and the General Corporation Law of the State of Delaware. No opinion
is  expressed as to the effect that the law of any other  jurisdiction  may have
upon the subject matter of the opinion  expressed  herein under conflicts of law
principles, rules and regulations or otherwise.

     Based on the  foregoing,  it is our opinion  that the Shares have been duly
and validly  authorized and reserved for issuance upon exercise of the Warrants,
and when the Warrants are properly  exercised,  and in connection  therewith the
Shares are paid for and issued, in accordance with the terms of the Warrants and
the  Warrant  Agreement,  the  Shares  will be  validly  issued,  fully paid and
non-assessable.

     We hereby  consent  to the  filing of this  opinion  as an  exhibit  to the
Registration  Statement  and to the  references  to this firm under the  caption
"Legal  Matters"  in  the  prospectus,  which  is a  part  of  the  Registration
Statement.


                                 Very truly yours,



                                 /s/  Cadwalader, Wickersham & Taft



                                                                    Exhibit 23.1
                                                                    ------------

                         CONSENT OF INDEPENDENT AUDITORS


We  consent  to the  reference  to our  firm  under  the  caption  "Experts"  in
post-effective   amendment  No.  4  on  Registration  Statement  (Form  S-3)  to
Registration  Statement  (Form  S-1 No.  33-64968)  and  related  Prospectus  of
OXiGENE,  Inc.  for the  registration  of  shares  of  common  stock  underlying
outstanding warrants and to the incorporation by reference therein of our report
dated  January 12, 1998,  with respect to the  financial  statements of OXiGENE,
Inc.  included in its Annual Report (Form 10-K) for the year ended  December 31,
1997, filed with the Securities and Exchange Commission.



                                                       /s/  Ernst & Young LLP
                                                       ERNST & YOUNG LLP

New York, New York
July 16, 1998




                                                                    Exhibit 23.2
                                                                    ------------
                                   CADWALADER
                          Cadwalader, Wickersham & Taft

100 Maiden Lane                                                         New York
New York, NY 10038                                                    Washington
Tel: 212-504-6000                                                    Los Angeles
Fax: 212-504-6666                                                      Charlotte
                                                                          London





                    CONSENT OF CADWALADER, WICKERSHAM & TAFT



Cadwalader, Wickersham & Taft hereby consents to the reference to our firm under
the caption "Legal Matters" in the form of Prospectus included in Post-Effective
Amendment  No.  4 on Form  S-3 to Form  S-1  Registration  Statement  (File  No.
33-64968) of OXiGENE, Inc.


                                 /s/ Cadwalader, Wickersham & Taft
                                 ---------------------------------



New York, New York
July 16, 1998




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