CYTOGEN CORP
425, 2000-07-10
IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES
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                                       Filed by Cytogen Corporation
                                       Pursuant   to   Rule   425   under   the
                                       Securities  Act of 1933 and deemed filed
                                       pursuant   to   Rule   14a-12   of   the
                                       Securities Exchange Act of 1934.

                                       Subject Company: Advanced Magnetics, Inc.
                                       Commission File No. 0-14732

ON JULY 10, 2000,  CYTOGEN  CORPORATION,  A DELAWARE  CORPORATION,  AND ADVANCED
MAGNETICS,  INC., A DELAWARE  CORPORATION,  JOINTLY  FILED THE  FOLLOWING  PRESS
RELEASE:

                                                                               1

Contacts:
Richard W. Krawiec                       Jerome Goldstein
Cytogen Corporation                      Advanced Magnetics, Inc.
Vice President, Investor Relations       Chairman and Chief Executive Officer
and Corporate Communications             617-497-2070 ext. 3030
609-750-8289


                      CYTOGEN TO ACQUIRE ADVANCED MAGNETICS

          STRATEGIC MERGER STRENGTHENS CYTOGEN'S ONCOLOGY PRESENCE, AS
                 WELL AS PROVIDING PRODUCT, TECHNOLOGY AND CASH
                                    RESOURCES

Princeton,  NJ and Cambridge,  Ma - July 10, 2000 - Cytogen Corporation (Nasdaq:
CYTO) and Advanced Magnetics, Inc. (AMEX: AVM) today jointly announced that they
have entered into a definitive merger agreement under which Cytogen will acquire
Advanced Magnetics,  a developer of novel diagnostic  pharmaceuticals for use in
magnetic  resonance  imaging (MRI). The transaction  represents a strategic step
for  Cytogen to broaden  its  oncology  franchise,  which it intends to leverage
through its  proteomics  business  and the  development  of  products  using its
prostate specific membrane antigen (PSMA) technology.  The two companies believe
that this stock-for-stock transaction,  which includes products, technology, and
cash assets,  is in the best interests of the shareholders of both companies and
provides the combined company with the following benefits:

o  The acquisition  broadens Cytogen's medical oncology presence and strengthens
   its position in the area of cancer  staging and  detection,  in which Cytogen
   currently  markets two products,  ProstaScint(R),  a prostate  cancer imaging
   agent,  and OncoScint  CR/OV(R),  an imaging agent for ovarian and colorectal
   cancers.

o  Advanced Magnetics' near-term product,  Combidex(R), a MRI contrast agent for
   the  detection  of lymph node  metastases,  has produced  promising  clinical
   results and creates the potential for an enhanced  revenue  stream.  The U.S.
   Food and Drug Administration  (FDA) recently issued an approvable letter with
   respect to Combidex, following a priority review.

o  The combined company plans to utilize Cytogen's  oncology sales and marketing
   organization for the expected launch of Combidex in the first half of 2001.

o  At  March  31,  2000,  Advanced  Magnetics  had  $19.5  million  in cash  and
   marketable  securities.  The  enhanced  cash  position  created by the merger
   secures  development  resources  and provides  leverage to other areas of the
   combined  business,  including  prostate cancer  diagnostics and therapeutics
   based  on  PSMA  technology  and  Cytogen's  AxCell  Biosciences   proteomics
   subsidiary.


<PAGE>

                                                                               2


o  The combined  development  teams,  which have been responsible for a total of
   five FDA approved  products to date,  will apply their expertise to obtaining
   and  maintaining   regulatory   approvals  and  accelerating  the  commercial
   introduction  of  product  candidates  in  the  pipeline.  One  such  product
   candidate is Advanced  Magnetics'  next-generation  imaging agent, Code 7228,
   which is  scheduled to enter Phase II clinical  development  later this year.
   Code 7228 is being developed for oncology and magnetic resonance  angiography
   applications.

o  Cytogen gains cutting-edge,  iron oxide-based imaging technology as well as a
   state-of-the-art manufacturing facility, and a patent portfolio consisting of
   25 U.S. patents and additional U.S. and foreign pending patent  applications.
   Cytogen  plans  to use  Advanced  Magnetics'  Cambridge,  Massachusetts,  GMP
   facility for fill,  finish,  and  distribution  of two of Cytogen's  existing
   products, ProstaScint and OncoScint CR/OV imaging agents.

Under  the  terms  of the  agreement,  Cytogen  will  acquire  all  of  Advanced
Magnetics'  outstanding  stock  in  a  tax-free,   stock-for-stock   transaction
structured  as a pooling of interests.  Advanced  Magnetics'  shareholders  will
receive $60 million in shares of Cytogen common stock. Each outstanding Advanced
Magnetics  common  share will be  converted  into $8.75  market value of Cytogen
common shares,  subject to a collar on the price of Cytogen common stock ranging
from $8.55 to  $11.56.  The  transaction  is subject  to  approval  by  Advanced
Magnetics' shareholders and is expected to close in the third quarter of 2000.

"By growing Cytogen via a strategic,  synergistic acquisition,  we are aiming to
leverage the value of our existing assets and expertise to increase  shareholder
value," said H. Joseph Reiser, Ph.D.,  Cytogen's Chief Executive Officer.  "This
acquisition  fits well with our  continuing  strategy to  introduce  specialized
cancer  products  that aid  physicians  in the  diagnosis and staging of various
cancers using novel physiological  targeting  approaches.  Since lymph nodes are
often the first  sites to which  cancer  spreads  from the primary  tumor,  such
staging  information  is critical in making the best  treatment  decisions.  The
Advanced  Magnetics  acquisition  goes hand in glove with our  present  prostate
cancer product and related  development  efforts,  and their near-term  product,
Combidex,  could allow us to build a leading company in lymph-node-based  cancer
staging and diagnosis.  We estimate that in the broader oncology field there are
over  800,000  cancer  patients in the United  States who may benefit from lymph
node imaging."

"Advanced  Magnetics'  working capital should provide the combined  company with
ready funding for the commercialization of Combidex,  assuming final approval is
granted," added Dr. Reiser.  "With the combined  expertise of the two management
teams,  we believe that we could be in a stronger  position to accelerate  other
corporate goals related to the development of  immunotherapies,  the acquisition
of new products,  and the further  acceleration of our proteomics  initiative at
our wholly owned subsidiary, AxCell BioSciences."

"Cytogen provides a logical strategic fit for Advanced  Magnetics'  products and
personnel,"  said Jerome  Goldstein,  Chairman  and CEO of  Advanced  Magnetics.
"Advanced  Magnetics'  technology  and  products  have the  potential to achieve
greater  market  penetration  under  the  Cytogen  umbrella  than they do alone.
Therefore,  I believe that the  combination  of the two companies is in the best
interests  of both  groups of


<PAGE>

                                                                               3


shareholders.  In addition, the timing of this transaction is ideal. We recently
received an initial action letter from the FDA indicating  that our Combidex MRI
contrast agent for imaging of metastatic lymph nodes was  `approvable,'  subject
to certain  conditions being satisfied.  We believe the combined company will be
well  positioned  to  launch  and  market  this  product  to  oncologists   upon
anticipated  final  approval,  given our  combined  experience  in the  oncology
marketplace with metastatic  cancer detection and Cytogen's recent deployment of
a dedicated oncology sales force."

UBS  Warburg  LLC and SG Cowen  Securities  Corporation  acted as the  financial
advisors to Cytogen Corporation and Advanced Magnetics, respectively.

Cytogen  Corporation is an established  biopharmaceutical  company in Princeton,
NJ, with two principal lines of business,  proteomics and oncology.  The Company
is extending  its  expertise in  antibodies  and  molecular  recognition  to the
development of new products and a proteomics-driven drug discovery platform. The
Company  has  established  a  pipeline  of  product   candidates  based  on  its
proprietary   antibody  and  prostate  specific   membrane  antigen,   or  PSMA,
technologies.  The Company, with Progenics  Pharmaceuticals,  Inc., has formed a
joint venture  focusing on the  development of cancer  immunotherapies  based on
PSMA technology.  The Company's cancer management  franchise currently comprises
three marketed FDA-approved products:  ProstaScint(R),  used to image the extent
and spread of prostate cancer;  OncoScint  CR/OV(R),  a diagnostic imaging agent
for  colorectal  and  ovarian  cancer;  and  Quadramet(R),  for  the  relief  of
cancer-related  bone  pain.  The  Company's  wholly  owned  subsidiary,   AxCell
Biosciences Corporation, is developing a proprietary protein pathway database as
a drug discovery and development tool for the  pharmaceutical  and biotechnology
industries. For additional information on Cytogen, visit the Company's web sites
at www.cytogen.com and www.axcellbio.com.

Advanced  Magnetics,  Inc.  is a  biopharmaceutical  company,  with  offices  in
Cambridge,   MA,  and  Princeton,   NJ,   dedicated  to  the   development   and
commercialization of pharmaceutical  products for the diagnosis and treatment of
cancer and other diseases. Feridex I.V.(R), the Company's contrast agent used in
MRI for the  detection of liver  lesions,  is  currently  marketed in the United
States,  Japan,  western  Europe,  Argentina,  Israel,  China and  South  Korea.
GastroMARK(R),  for use in conjunction  with MRI to distinguish the loops of the
bowel from other  abdominal  structures,  is marketed  in the United  States and
western  Europe.  An approvable  letter has been received from the U.S. Food and
Drug Administration for the Company's third product, Combidex, for use in MRI to
aid diagnosis of lymph node  disease.  The  Company's  Research and  Development
efforts  include  Code  7228  for  use in  oncology  applications  as well as MR
angiography.  For  additional  information  on  Advanced  Magnetics,  visit  the
Company's web site at www.advancedmagnetics.com.

This release contains certain "forward-looking statements" within the meaning of
the Private Securities Litigation Reform Act of 1995. These statements are based
on managements'  current expectations and are subject to uncertainty and changes
in  circumstances.  Actual  results may vary  materially  from the  expectations
contained in the forward-looking  statements.  The forward-looking statements in
this release include statements addressing the following subjects: expected date
of closing the acquisition;  future financial and operating results;  timing and
benefits of acquisition; expected


<PAGE>

                                                                               4


regulatory approval and marketing of Combidex;  and enhanced product development
efforts.

The  following  factors,  among  others,  could cause  actual  results to differ
materially from those described in the  forward-looking  statements:  failure of
the  Advanced  Magnetics'  shareholders  to adopt the  agreement  providing  for
Cytogen's  acquisition  of Advanced  Magnetics;  the risk that the businesses of
Cytogen and Advanced  Magnetics will not be integrated  successfully;  and other
economic,  business,  competitive  and/or regulatory  factors affecting Advanced
Magnetics'  and  Cytogen's  businesses,  the ability to satisfy  the  conditions
specified  for final  approval  of  Combidex  for  imaging of lymph nodes and to
resolve the final labeling for Combidex with the FDA.

More  detailed  information  about  these  factors  is  set  forth  in  Advanced
Magnetics' and Cytogen's  filings with the  Securities and Exchange  Commission,
including  Advanced  Magnetics'  Annual  Report on Form 10-K for the fiscal year
ended  September 30, 1999,  Cytogen's  Annual Report on Form 10-K for the fiscal
year ended December 31, 1999, their most recent  Quarterly  Reports on Form 10-Q
and Cytogen's  Current Reports on Form 8-K.  Advanced  Magnetics and Cytogen are
under no obligation to (and expressly disclaim any such obligation to) update or
alter their  forward-looking  statements whether as a result of new information,
future events or otherwise.

Investors    and   security    holders   are   advised   to   read   the   proxy
statement/prospectus  regarding the business combination  transaction referenced
in the foregoing information when it becomes available,  because it will contain
important  information.  The proxy  statement/prospectus  will be filed with the
Securities  and  Exchange  Commission  by Advanced  Magnetics,  Inc. and Cytogen
Corporation.  Investors and security holders may obtain a free copy of the proxy
statement/prospectus  (when  available)  and other  documents  filed by Advanced
Magnetics and Cytogen at the  Commission's web site at  http://www.sec.gov.  The
proxy  statement/prospectus  and such other  documents may also be obtained from
Advanced  Magnetics  or from  Cytogen by  directing  such  request  to  Advanced
Magnetics, Inc., Attention: Corporate Secretary, 61 Mooney Street, Cambridge, MA
02138, telephone:  (617) 497-2070; or Cytogen Corporation:  Corporate Secretary,
600 College Road East, CN 5308, Princeton, NJ 08540, telephone: (609) 750-8200.

Advanced  Magnetics and certain other persons referred to below may be deemed to
be  participants  in  the   solicitation  of  proxies  of  Advanced   Magnetics'
shareholders  to adopt the  agreement  providing for  Cytogen's  acquisition  of
Advanced  Magnetics.  The  participants  in the  solicitation  may  include  the
directors and executive officers of Advanced Magnetics, who may have an interest
in the  transaction,  including  as a result of  holding  shares or  options  of
Advanced  Magnetics.  A detailed  list of the names and  interests  of  Advanced
Magnetics'  directors and executive officers is contained in Advanced Magnetics'
Proxy  Statement  for its most  recent  Annual  Meeting,  which may be  obtained
without charge at the Commission's web site at http://www.sec.gov.

                                       ###




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