EXHIBIT 10.1

          Confidential Materials omitted and filed separately with the
        Securities and Exchange Commission. Asterisks denote omissions.


                             MANUFACTURING AGREEMENT


     MANUFACTURING  AGREEMENT,  dated September 10, 2004, by and between CYTOGEN
CORPORATION,  a Delaware  corporation  ("Cytogen")  and LAUREATE  PHARMA L.P., a
Delaware limited partnership ("Laureate").

                              W I T N E S S E T H :

     WHEREAS,  Cytogen  wishes to engage the  services  of  Laureate  to produce
Filled   ProstaScint   Product  and  Filled  Sodium  Acetate  Product  (each  as
hereinafter defined) in accordance with the provisions hereof.

     NOW, THEREFORE, it is agreed as follows:

     1.  Definitions.  The following terms shall have the meanings  specified in
         -----------
this paragraph 1. Other terms are defined in this Agreement and, throughout this
Agreement,  those terms shall have the meanings  respectively  ascribed to them.

         (a) "Affiliate"  means,  with  respect  to a party,  any  individual or
entity which  controls,  is controlled  by or is under common  control with such
party.  For  purposes of this  definition,  "control"  means an equity or income
interest  of fifty  percent  (50%) or more in, or the  possession,  directly  or
indirectly, of the power to cause the direction of the management, activities or
policies of such  individual or entity,  whether through the ownership of voting
securities or other equity interest, by contract or otherwise.

         (b) "Batch"  means (i) with respect to CYT-351,  the specific  quantity
of CYT-351 which is produced as a result of the performance of [**] hollow-fiber
runs;  (ii) with respect to CYT-356,  the specific  quantity of CYT-356 which is
produced from the conjugation



of a Batch of CYT-351, or the conjugation of a specified identified portion of a
Batch of CYT-351 or the  conjugation of combined  batches of CYT-351;  and (iii)
with respect to sodium acetate buffer solution,  the specific quantity of sodium
acetate buffer  solution  produced  during the course of a single  manufacturing
run.

         (c) "Bulk Sodium  Acetate"  means sodium acetate prior  to being filled
into vials.

         (d) "Cytogen  SOPs"   means  Cytogen's   written   standard   operating
procedures to be utilized in connection  with the  manufacture,  production  and
in-process release testing of CYT-351,  CYT-356,  Filled ProstaScint Product and
Filled Acetate Product, true and complete copies of which have been delivered to
Laureate.

         (e) "Cytogen Supplied Materials"  means (i) the CYT-351 [**] Cell Line,
(ii) [**] linker chelator, and (iii) Product-Dedicated  Equipment chromatography
columns,  multi-use  resins and filtration  cassettes,  components and supplies,
required in  connection  with the  production  by  Laureate  of CYT-351,  Filled
ProstaScint Product or Filled Sodium Acetate Product, provided at Cytogen's sole
cost and expense.

         (f) "CYT-351" means the monoclonal  antibody intermediate product which
is used in manufacturing  ProstaScint.

         (g) "CYT-356" means  the immunoconjugated form  of  CYT-351  (sometimes
referred to in the course of manufacture  and  production of Filled  ProstaScint
Product as bulk ProstaScint).

         (h) "Facility"  means  Laureate's manufacturing  and  filling  premises
located in  Princeton,  New Jersey.



         (i) "FDA"  means the  United States  Food and Drug  Administration  and
shall  include  any  division or center  thereof.

         (j) "Filled  Sodium Acetate  Product" means  vials filled  with  sodium
acetate  solution from an  identified  Lot which are in a form ready for release
and shipment from the Facility.

         (k) "Filled  ProstaScint Product"  means the vials  filled with CYT-356
from an  identified  Lot which are in a form ready for release and shipment from
the  Facility.

         (l) "cGMP"  means  current   Good   Manufacturing  Practices  for   the
manufacture and testing of pharmaceutical materials, as specified in the Code of
Federal  Regulations and associated  regulatory  agency  guidelines as currently
interpreted  and  practiced  by  Laureate  at the  Facility.

         (m) "Hollow-Fiber Bioreactor  Run" means  cells grown for approximately
[**] in the [**]  bioreactor  using [**].

         (n) "Incoming Acceptance Tests"  means, with  respect  to each  Cytogen
Supplied  Material,  the  analysis  or testing  thereof  supplied to Laureate by
Cytogen  pursuant to  paragraph  6(b) hereof and to be  performed by Laureate in
order to determine  whether or not such Cytogen Supplied Product conforms to the
applicable approved Specifications.

         (o) "Laureate   SOPs"  means  Laureate's  written   standard  operation
procedures utilized by Laureate in connection with its operational activities at
the  Facility.

         (p) "Lot" means a Batch or a specific identified portion of a  Batch of
CYT-351,  CYT-356 or sodium  acetate,  as  applicable,  which is produced in the
course of Laureate's  performance of a single manufacturing  production run.



         (q) "Manufacturing   Procedures"   means  the  activities,   processes,
procedures,  instructions  and batch  records  provided  to  Laureate by Cytogen
pursuant  to  paragraph  6(a)  hereof  and to be  utilized  by  Laureate  in the
production of CYT-351,  CYT-356,  Filled  ProstaScint  Product and Filled Sodium
Acetate Product.

         (r) "Product Dedicated  Equipment"  shall mean columns,  certain filter
housings and filling  components,  as specified in the  Specifications,  Cytogen
SOPs, Laureate SOPs, or Manufacturing Procedures,  as applicable,  that are only
used in the Manufacturing Procedures.

         (s) "Production Campaign" shall mean: (i) [**]  Hollow-Fiber Bioreactor
Runs, for  convenience  labeled runs [**],  with the runs being done [**],  such
that [**] would be staggered approximately [**] or less apart, and [**] would be
similarly  time-staggered;  (ii) [**] purifications,  each of the combination of
[**] of the [**]  Hollow-Fiber  Bioreactor  Runs, to generate  CYT-351;  (iii) a
total of [**] conjugations of the CYT-351 to generate [**] Lots of CYT-356. Only
[**] conjugations  would be carried out in this initial campaign.  The remaining
CYT-351  shall be stored by Laureate up to [**] or until  Cytogen  requests that
this remaining  CYT-351 be  conjugated;  (iv) a total of [**] lots of conjugated
antibody in vials, approximately [**] vials per lot; and (v) [**] sodium acetate
fills,  each fill  utilizing  a volume  of sodium  acetate  buffer  solution  as
specified in the Batch Record including all Services  required to supply Cytogen
with Filled Sodium Acetate Product.

         (t) "ProstaScint"  means the compound  capromab pendetide formulated by
conjugating  the  murine  monoclonal  antibody  CYT-351  to the  linker-chelator
[**] (CYT-063).



         (u) "Quality  Agreement"  means  a detailed  agreement  specifying  the
quality and regulatory  procedures and responsibilities of the parties hereunder
with respect to the production of bulk CYT-351,  CYT-356,  Bulk Sodium  Acetate,
Filled  ProstaScint  Products and Filled Sodium  Acetate  Products to be entered
into  contemporaneously  with, or shortly after, this Agreement.

         (v) "Services" means  the  activities  undertaken  by  Laureate  in the
course of  Laureate's  performance  of the  Production  Campaign and  associated
activities  and  testing,  or  any  part  thereof.

         (w) "Specifications"  means  Cytogen's   approved  specifications  with
respect  to  CYT-351,   CYT-356,  Bulk  Sodium  Acetate,  the  Cytogen  Supplied
Materials,  Filled  ProstaScint  Product and Filled Sodium Acetate  Product,  as
applicable,  provided to  Laureate.  Specifications  may be amended from time to
time by mutual written agreement of Laureate and Cytogen subject to the approval
by the FDA of each amendment,  if necessary.

     2.  Commencement;  Orders;  Options; Expiration.  (a) This Agreement  shall
         -------------------------------------------
commence on the date hereof.

         (b) Cytogen  hereby orders from  Laureate the  Services required to  be
performed by Laureate in connection  with  Laureate's  conduct of the Production
Campaign.

         (c) Subject to  the provisions  hereof,  this Agreement shall expire on
such date  as when Laureate has completed  the Production  Campaign for all [**]
Lots of conjugated  antibody and the Filled  ProstaScint  Product and the Sodium
Acetate  Product  resulting  therefrom  have been  shipped  from the Facility in
accordance with paragraph 10 hereof, subject to release by Cytogen of the Filled
ProstaScint Product and the Filled Sodium Acetate Product in



accordance with the terms of the Quality Agreement.  The parties anticipate that
the completion of the [**] Lot shall be on or before [**].

     3.  Consideration and Payment.  In consideration  of Laureate's performance
         -------------------------
of Services  hereunder,  Cytogen agrees to pay to Laureate the  development  and
service fees listed in Appendix 1 (the "Service Fees") to perform the Production
Campaign  and  Services.  Customer  shall  pay  Laureate  the  Service  Fees  in
accordance  with the payment  schedule  set forth in Appendix 1.  Laureate  will
invoice the Customer for Product-Dedicated  Equipment,  resins and supplies that
Laureate purchases for the Production  Campaign.  An administrative fee equal to
[**] of Laureate's actual cost of such materials and equipment purchased for the
Production  Campaign will be added to the invoices.  Payments and non-refundable
deposits  are due thirty  (30) days from the date of  invoice,  except  that the
Service  Fees'  payments  are due at the times  indicated  in  Appendix  1. Late
payments  are subject to an interest  charge of [**].  Cytogen  shall  receive a
credit  against the Service  Fees in the amount of [**] that has been prepaid by
Cytogen  against  the  Service  Fees  for  materials  and  preparation  of  cGMP
documentation  purchased by Cytogen prior to the date hereof.  Such credit shall
be  applied  against  amounts  owed by Cytogen  on the first  invoices  that are
received from Laureate under the terms of this Agreement.

     4.  Liquidated  Damages.  Subject  to the  provisions  hereof, in the event
         -------------------
Cytogen  does not order,  or cancels  the order for,  [**]  hollow  fiber  runs,
Cytogen  agrees to pay  Laureate  liquidated  damages  of [**].  In such  event,
Cytogen shall pay Laureate [**] of this  liquidated  damages [**] to Laureate no
later than [**]. The [**] of the  liquidated  damages [**] will be paid no later
than [**].



     5.  Performance of Services; Other Assistance;  FDA Fees. (a) All  Services
         ----------------------------------------------------
shall be  performed  by Laureate at  Laureate's  facility  in  Princeton,  NJ in
accordance  with the  Quality  Agreement.

         (b) Any FDA fee with  respect  to the licensing of  facilities at which
commercial manufacture of Cytogen marketed  pharmaceutical products occurs shall
be  borne  and  paid  for  by  Cytogen   ("Establishment  Fee").  Laureate  will
immediately   inform   Cytogen  of  any  and  all  FDA   approved  and  marketed
pharmaceutical  products  manufactured  by Laureate in the  Facility for a third
party in addition to Laureate's manufacturing services hereunder. Laureate shall
have the  right to  perform  manufacturing  services  for third  parties  at the
Facility.

     6.  Manufacturing  and Testing;  Approvals; SOPs. (a)  Cytogen has provided
         --------------------------------------------
Laureate in writing with the  Manufacturing  Procedures  which shall include all
requisite   technical   specifications,   manufacture  and  production   process
information,  batch records,  instructions  and procedures,  testing and quality
control instructions and procedures, formulae, storage instructions with respect
to the  manufacture of Sodium  Acetate,  CYT-351,  CYT-356,  Filled  ProstaScint
Product,  Filled Sodium Acetate Product or  intermediates  of any nature and all
such  other  information,  knowledge,  data  and  know-how  as would  allow  one
reasonably  practiced  in the art to produce  and  manufacture  Sodium  Acetate,
CYT-351,  CYT-356, Filled ProstaScint Product and Filled Sodium Acetate Product.

         (b) Cytogen  has  provided   Laureate  in writing  with  the   Incoming
Acceptance  Tests which  shall  include all  requisite  analyses  and tests with
respect to each Cytogen Supplied Material, the methodology of each such analysis
and test,  the sample size of the  applicable  Cytogen  Supplied  Material to be
utilized in connection  with the  performance of the applicable  analyses and/or
tests and the  period following Laureate's receipt of such Cytogen



Supplied  Material at the Facility during which the applicable analyses or tests
are to be conducted.

         (c) Cytogen  has provided  Laureate in writing  with the Specifications
for each of Sodium Acetate,  CYT-351,  CYT-356,  Filled ProstaScint  Product and
Filled Sodium Acetate Product.

         (d) Laureate  will provide  to Cytogen the  Laureate SOPs for approval.
Such  Laurate  SOPs shall be provided by Laureate  and  reviewed and approved by
Cytogen (such approval not to be unreasonably withheld or delayed) in accordance
with the Target Project Timeline (as hereinafter  defined).

         (e) Within ten (10) days after  execution  of this Agreement,  Laureate
shall notify Cytogen in writing of any  additional  information,  processes,  or
procedures  needed by Laureate in order to complete the  Production  Campaign or
Services.

         (f) In the  event that Laureate gives notice pursuant to paragraph 6(e)
of its need for  additional  information,  processes or procedures  necessary in
order to complete  the  Production  Campaign or  Services,  Laureate and Cytogen
shall  mutually  prepare an action plan (the  "Plan")  with  respect to enabling
Laureate to perform the Production  Campaign and to provide Services as required
herein. Each of Laureate and Cytogen agrees to undertake  reasonable  commercial
efforts  to  implement  the  Plan  to the end of  providing  Laureate  with  the
capability  of rendering  Services and  performing  the  Production  Campaign in
conformance with this Agreement.

         (g) Laureate  shall commence  and complete  the Production  Campaign in
accordance with the Target Project  Timeline  attached hereto as Appendix 2 (the
"Target  Project  Timeline") and  acknowledges  that time is of the essence with
respect to the production



and delivery of CYT-351,  CYT-356,  Filled ProstaScint Product and Filled Sodium
Acetate  Product.

         (h) Cytogen has provided to Laureate the  Cytogen  SOPs, Specifications
and Batch documentation in writing.

     7.  Materials  Delivery; Testing.
         ----------------------------

         (a) All  costs and  expenses  of any  nature  or kind  whatsoever  with
respect to Cytogen  Supplied  Materials or the shipment and delivery  thereof to
the Facility shall be borne and paid by Cytogen in accordance with the terms and
conditions  agreed to by Cytogen with the vendor and/or carrier,  as applicable,
following receipt of the vendor's or carrier's invoice.

         (b) Title to all Cytogen  Supplied  Materials  shall  remain in Cytogen
notwithstanding  the storage and Laureate's  possession thereof at the Facility.
Laureate  shall  use  reasonable  care to  maintain  any such  Cytogen  Supplied
Materials stored at Laureate's  facility in accordance with all applicable laws,
rules, procedures and regulations including, but not limited to, cGMPs.

         (c) Cytogen  agrees to deliver or cause to be delivered to the Facility
such of the Cytogen Supplied Materials as are necessary to perform or complete a
process or activity part of the Manufacturing  Procedures not less than [**] nor
more than [**] prior to the scheduled  performance  of such process or activity,
subject to the timely notification by Laureate of the need for such materials.

         (d) Following  receipt of a Cytogen  Supplied Material at the Facility,
Laureate shall perform the applicable  analysis thereof or test thereon provided
for in the  Incoming  Acceptance  Tests.  Laureate  shall  promptly  provide the
written results of such tests to



Cytogen.  Cytogen shall promptly review the test results to determine conformity
to the  Specifications  of the Cytogen  Supplied  Material.  Laureate  shall not
release the Cytogen  Supplied  Materials for  performance  of the Services until
Cytogen has notified Laureate,  in writing,  that the Cytogen Supplied Materials
meet the Specifications based upon the results of such testing.

         (e) In  the  event  that  either  party  determines  that  the  Cytogen
Supplied Material does not meet  Specifications  or is otherwise  unsuitable for
use in connection  with the  production  of Sodium  Acetate,  CYT-351,  CYT-356,
Filled  ProstaScint  Product or Filled Sodium Acetate Product,  such party shall
promptly notify the Cytogen Contact  Individual or Laureate  Contact  Individual
(each as hereinafter defined), as the case may be, of such determination and the
results of the  applicable  analyses or tests  performed.

         (f) In  the event  that either  party provides  notice under  paragraph
7(e),  Cytogen shall promptly inform Laureate in writing of the action it wishes
Laureate to take with  respect to the  Cytogen  Supplied  Material in  question,
including  reanalysis,  retesting,  disposal,  return  or such  other  action as
otherwise specified by Cytogen.  Costs incurred by Laureate under this paragraph
7(e) shall be invoiced to Cytogen in accordance with paragraph 3 hereof.

         (g) Cytogen shall use its reasonable  commercial  efforts to deliver or
cause to be delivered to the Facility,  Cytogen Supplied Material in replacement
of any material which does not meet Specifications or is otherwise unsuitable in
the production of CYT-351,  CYT-356, Filled ProstaScint Product or Filled Sodium
Acetate  Product to the end that the date  scheduled  by Laureate for the use of
such  Cytogen   Supplied  Product  in  connection  with  the  performance  of  a
Manufacturing  Procedure  is  maintained.



         (h) In   the  event   a  Cytogen  Supplied   Material  fails   to  meet
Specifications  and Cytogen is unable to timely deliver or cause to be delivered
to the Facility the applicable Cytogen Supplied Material in replacement  thereof
so as to maintain the date  scheduled by Laureate (as notified to Cytogen  under
paragraph 7(c)) for use of such Cytogen  Supplied Product in connection with the
performance of a Manufacturing  Procedure,  then Laureate may, in its discretion
and  without  liability  for any delay in the  manufacture  of  Sodium  Acetate,
CYT-351,  CYT-356, Filled ProstaScint Product and Filled Sodium Acetate Product,
revise the Target Project  Timeline and give notice of such revised  schedule to
Cytogen to the end that Laureate may perform any commitment Laureate may have to
any third party or  Affiliate  with  respect to  utilization  of the Facility as
permitted  under this  Agreement;  provided,  however,  that  Laureate  will use
commercially reasonable efforts to attempt to negotiate to defer the performance
of any such  commitment  to a third party or Affiliate to the end that  Laureate
may  perform  the  Services  required  with  respect to  Laureate's  order under
paragraph 2(b) on a priority  basis.  Notwithstanding  the  foregoing,  when the
Cytogen  Supplied  Materials or Product  Dedicated  Equipment that are compliant
with the  Specifications  have been  provided to  Laureate,  Laureate  shall use
commercially   reasonable  efforts  to  complete  the  Production   Campaign  in
accordance with the Target Project Timeline  (appropriately  adjusted to account
for any delays).

         (i) The  applicable  provisions  of  the  Quality  Agreement  shall  be
complied  with in the event  Laureate  utilizes  the services of any third party
sub-contractors  in connection  with  Laureate's  performance of this Agreement.
Cytogen shall pre-approve, in writing, any such third party sub-contractors, who
have not previously been approved by Cytogen, to be utilized by Laureate.



         (j) Cytogen shall own all data relating to the Services and  Production
Campaign  performed  by Laureate  pursuant  to the terms  hereof.  All  original
documents for the Production  Campaign will remain with  Laureate,  with Cytogen
receiving photocopies thereof.

     8.  Payment Dates; Late Payments. (a) Invoices by Laureate with  respect to
         ----------------------------
amounts due in respect of  paragraph  3 or 4 shall be payable  upon such term as
are set forth in paragraphs 3 and 4, respectively,  hereof.

         (b) Invoices  due  for Services  performed in  accordance  with Quality
Agreement  due  pursuant  hereto and not timely paid shall bear  interest at the
rate of [**] on the unpaid  balance thereof.

         (c) Time is  of the essence  with  request to payments  due  hereunder.
Unless otherwise  specified  herein, in the event that an invoice remains unpaid
for [**] following written notice by Laureate to Cytogen of such failure to pay,
Laureate may, in addition to its rights under  paragraph 16 hereof,  (i) suspend
the performance of its obligations  hereunder with respect to the manufacture of
Sodium  Acetate,  CYT-351,  CYT-356,  Filled  ProstaScint  Product and/or Filled
Acetate Product until such time as payment is made and (ii) in the event of such
suspension,  Laureate may exercise its right, as provided for in paragraph 7(i),
to revise the Target Project Timeline.

     9.  Regulatory  Matters and Approvals; Order Dates.  (a) Laureate agrees to
         ----------------------------------------------
use its  commercially  reasonable  efforts  to the  end  that  Laureate  has the
capability  to perform  the  Services  and the  Manufacturing  Procedures  to be
utilized in connection with the performance of Production  Campaign with respect
to the end of producing the first Batch of  ProstaScint  not later than the date
specified in the Target Project Timeline.



         (b) Cytogen  agrees  that  it shall  not, with  respect  to an order of
Filled ProstaScint Product or Filled Sodium Acetate Product,  specify a date for
the  fulfillment  of all or part  of such  order  inconsistent  with  Laureate's
capability  to perform at the Facility a  Manufacturing  Procedure  necessary in
connection  with the  fulfillment  thereof prior to the date provided for in the
Target Project Timeline.

         (c) In    connection   with    this   Agreement   the   parties    have
contemporaneously  entered into and delivered a Quality Agreement,  with respect
to the quality and  regulatory  procedures and  responsibilities  of the parties
hereunder  with respect to the  production  of Filled  ProstaScint  Products and
Filled Sodium Acetate Products.  The Quality Agreement does, inter alia, provide
for, among other things, Cytogen's responsibility for approving the release from
storage  and use of each  Cytogen  Supplied  Material  in  connection  with  the
production of Filled ProstaScint Product and Filled Sodium Acetate Product,  any
intermediate   compounds  produced  in  the  course  of  the  performance  of  a
Manufacturing  Procedure, the release for shipping of Filled ProstaScint Product
and  Filled   Sodium   Acetate   Product  from  the   Facility,   and  Cytogen's
responsibility for all regulatory approval or activities necessary in connection
with the Manufacturing Procedures,  and shall further specify Cytogen's right to
inspect the Facility,  the obligations of the parties upon any FDA inspection of
the  Facility,  all records to be  maintained  by each party with respect to the
manufacture  and  production of Filled  ProstaScint  Product and Filled  Acetate
Product, including without limitation, Batch production records, in-process test
data,  environmental monitoring data, testing data by Lot for Filled ProstaScint
Product,  Filled  Sodium  Acetate  Product  or  intermediates  and  such  of the
foregoing as shall appear on invoices with respect to Filled ProstaScint Product
or Filled Sodium Acetate Product  released for shipment by Cytogen.



         (d) Cytogen acknowledges that  the  [**] Process ("[**]  Process"),  is
not currently approved by FDA as part of the ProstaScint  manufacturing process.
Cytogen will take appropriate  actions to provide for the proper notification to
FDA  regarding  this  process  change,  and  will  provide  copies  of any  such
notifications sent by Cytogen to FDA, to Laureate. Cytogen acknowledges that the
[**] Process is the process Cytogen has specified Laureate to perform as part of
the  Manufacturing  Procedures to be supplied by Cytogen to Laureate pursuant to
this  Agreement.  Laureate  shall  have  no  liability  of any  nature  or  kind
whatsoever  by reason of its  performance  of its  obligations  hereunder  which
arises from, or is the result of, Laureate's  utilization of the [**] Process as
a  Manufacturing  Procedure  in  connection  with the  manufacture  of  CYT-351,
CYT-356,  Filled ProstaScint Product or Filled Sodium Acetate Product.  Laureate
shall  maintain  the [**] in working  order and in  compliance  in all  material
respects with all applicable laws, rules and regulations.

     10. Stability  Testing;   Shipping.  Laureate  shall   deliver  the  Filled
         ------------------------------
ProstaScint  Product and the Filled Sodium Acetate Product EXW (Incoterms  2000)
at the  Facility  to a carrier  designated  by  Cytogen.  Cytogen  shall pay all
shipping charges associated with the delivery of the Filled ProstaScint  Product
and the Filled Sodium Acetate Product. Title to the CYT-351,  Filled ProstaScint
Product and Filled Sodium Acetate  Product shall pass to Cytogen upon Laureate's
release, and Cytogen's acceptance,  of the forgoing materials.  Unless otherwise
agreed, Cytogen agrees to take all commercially  reasonable actions necessary to
the end that Filled  ProstaScint  Product and Filled Sodium Acetate  Product are
shipped from the Facility not later than thirty (30) days  following the release
by Cytogen of the  Filled  ProstaScint  Product  and the Filled  Sodium  Acetate
Product for shipment  under the terms of the Quality  Agreement.  Any extensions
are to be agreed  upon in writing  with  Cytogen's  recognition  that it will be
assessed



Laureate's  listed storage fees which are set forth in Appendix 1. Laureate will
perform  stability  testing on behalf of Cytogen  according to Cytogen's written
instructions.

     11. Cytogen's Covenants, Representation and Warranties.  Cytogen covenants,
         --------------------------------------------------
represents  and warrants to and with Laureate as follows:

         (a) Cytogen shall use its  commercially reasonable efforts to dutifully
and timely perform its obligations and  responsibilities  hereunder,  including,
without  limitation,  any  obligation  or  responsibility  provided  for  in the
Manufacturing  Procedures,  Incoming Acceptance Tests and the Quality Agreement.

         (b) Cytogen  shall use  its commercially  reasonable efforts  to assure
that all Cytogen  Supplied  Materials,  when received at the  Facility,  (i) are
approved  by Cytogen  for use in  connection  with the  manufacture  of CYT-351,
CYT-356,  Filled  ProstaScint  Product  and  Filled  Sodium  Acetate  Product in
accordance with cGMP, (ii) meet  Specifications  and are suitable for use in the
manufacture of Sodium Acetate,  CYT-351,  CYT-356, Filled ProstaScint Product or
Filled Sodium Acetate Product, (iii) comply with Cytogen's quality standards and
(iv) each such Cytogen  Supplied  Material which is subject to the provisions of
the Food,  Drug and Cosmetics Act, 21 USCS Section 301, et seq. ("FDC Act"),  as
and when received at the Facility,  is not adulterated or misbranded  within the
meaning of the FDC Act or any applicable  state law in which the  definitions of
adulteration of misbranding are substantially the same as those contained in the
FDC Act, or an article  which may not,  under the  provisions of the FDC Act, be
introduced  into  interstate  commerce.

         (c)  Cytogen  shall not authorize for shipment from the Facility Filled
ProstaScint  Product or Filled Sodium Acetate  Product subject to the provisions
of the FDC Act, which is adulterated or misbranded within the meaning of the FDC
Act or any applicable state



law in which the definitions of adulteration  and misbranding are  substantially
the same as those  contained in the FDC Act, or an article which may not,  under
the provisions of the FDC Act, be introduced  into interstate  commerce.

         (d) To  the  best of  Cytogen's  knowledge,  Laureate's manufacture and
production of Sodium Acetate,  CYT-351,  CYT-356,  Filled ProstaScint Product or
Filled Acetate Product, including, without limitation, Laureate's performance of
its Services  hereunder in conformity  with the  Manufacturing  Procedures,  the
Incoming  Acceptance  Tests and the Quality  Agreement and Cytogen's  marketing,
sale, distribution and promotion of Filled ProstaScint Product and Filled Sodium
Acetate Product do not infringe or violate the  intellectual  property rights of
any third party.

         (e) Cytogen  has all  requisite  corporate power and authority to enter
into this Agreement and perform its obligations and responsibilities  hereunder,
including,   without  limitation,  all  such  obligations  and  responsibilities
provided for in the Manufacturing Procedures,  Incoming Acceptance Tests and the
Quality Agreement.

     12. Laureate's   Covenants,   Representations   and   Warranties;   Limited
         -----------------------------------------------------------------------
Liability.  (a) Laureate covenants,  represents and warrants to and with Cytogen
- ---------
as follows:

         (i)   Laureate's  maintenance   of  the  Facility  and  performance  of
     manufacturing   and   other   services  hereunder  shall   conform  in  all
     material  respects  with   all   applicable  cGMPs  and  Cytogen's  written
     instructions.

         (ii)  Laureate  shall not ship any Filled  ProstaScint Product,  Filled
     Sodium Acetate  Product or any  intermediate manufactured  or formed in the
     course of  production of  Filled  ProstaScint  Product  and  Filled  Sodium
     Acetate



     Product unless the release for shipment  and subsequent  shipment have been
     authorized in writing by Cytogen.

         (iv)  Laureate has all requisite power and authority to enter into this
     Agreement  and  perform  its  obligations  hereunder,  including,   without
     limitation, all such obligations and   responsibilities   provided  for  in
     the  Manufacturing Procedures,  Incoming Acceptance  Tests and the  Quality
     Agreement.

         (v)  Laureate shall use  commercially reasonable efforts to perform (in
     accordance  with   the  Target  Project   Timeline)  its   obligations  and
     responsibilities hereunder, including without limitation, any obligation or
     responsibility  provided  for  in  the  Manufacturing  Procedures, Incoming
     Acceptance Tests and the Quality Agreement.

         (b) EXCEPT  AS  PROVIDED  IN  PARAGRAPH 12(a), LAUREATE  MAKES NO OTHER
REPRESENTATION  AND  WARRANTY  OF  ANY  KIND,   EXPRESSED  OR  IMPLIED,   AS  TO
MERCHANTABILITY, FITNESS FOR PARTICULAR PURPOSE OR ANY OTHER MATTER WITH RESPECT
TO FILLED  PROSTASCINT  PRODUCT  AND/OR  FILLED  SODIUM  ACETATE  PRODUCT OR ANY
INTERMEDIATE  FORMED IN THE COURSE OF MANUFACTURE OF FILLED PROSTASCINT  PRODUCT
AND/OR FILLED SODIUM ACETATE PRODUCT, OR ANY OTHER MATTER WITH RESPECT TO FILLED
PROSTASCINT  PRODUCT OR FILLED SODIUM ACETATE  PRODUCT  WHETHER USED ALONE OR IN
COMBINATION WITH OTHER  SUBSTANCES.



         (c) In  the event of any  failure of Laureate  to perform in conformity
with its covenants, representations and warranties hereunder, Laureate shall, at
its sole cost and expense,  replace such quantity of Filled ProstaScint  Product
and/or Filled Sodium Acetate Product which Cytogen does not release for shipment
consistent  with  Cytogen's  covenant,   representation  and  warranty  made  in
paragraph 11(c) hereof because of such failure as promptly as practicable  after
receiving  the  Cytogen  Supplied   Materials   necessary  to  manufacture  such
replacement quantity. The cost of such Cytogen Supplied Materials, including the
cost and expense of Cytogen's  delivering or causing the same to be delivered to
the Facility  may be deducted by Cytogen from amounts due under this  Agreement.
In the event  that no amount is then due under  this  Agreement  by  Cytogen  to
Laureate,  then  Cytogen  may  invoice  Laureate  for the  cost of such  Cytogen
Supplied Material,  including without limitation,  any costs incurred by Cytogen
with respect to the shipping and delivery  thereof.  Time is of the essence with
respect to Laureate's payment of invoices rendered by Cytogen in accordance with
this  paragraph  12(c).  THE  FOREGOING  SHALL  BE  CYTOGEN'S  EXCLUSIVE  REMEDY
HEREUNDER IN THE EVENT OF ANY FAILURE BY LAUREATE TO PERFORM IN CONFORMITY  WITH
ITS COVENANTS, REPRESENTATIONS, AND WARRANTIES HEREUNDER.

         (d) Laureate   shall   not  be   liable  for,   and   Cytogen   assumes
responsibility  for, all personal injury and property damage  resulting from the
handling,  possession  or use of Filled  ProstaScint  Product and Filled  Sodium
Acetate Product following  Cytogen's release of same for shipment and Laureate's
placement of same with a carrier for shipment. In no event shall either party be
liable to the other party for special,  incidental or  consequential  damages or
loss of profits  whether  the claim  giving  rise to the same is for breach of a
covenant,  warranty  or  representation,  is  in  contract,  negligence,  strict
liability  or  otherwise.



         (e) It is  understood  and  agreed  that  Laureate's  obligations  with
respect to  performance  of any [**]  hollow  fiber  runs,  purification  of the
material  so  produced,   conjugated   and  filled   (collectively,   "Fiber-Run
Procedures")  are to  perform  the same in  conformance  with the  Manufacturing
Procedures and test for conformance to Specifications as provided in the Quality
Agreement.  Laureate  shall be liable for any failure of its  performance of the
Fiber-Run Procedures to yield CYT-351 of any specific quality specification,  or
a reasonable  quantity of CYT-351 (defined as  approximately  [**] purified in a
single  purification  from  [**]  hollow-fiber  reactor  runs)  or a  reasonable
quantity of Filled ProstaScint Product (defined as approximately [**] vials from
a single conjugation Batch of CYT-351) only in the event Laureate's  performance
of the  Fiber-Run  Procedures  was not in  conformance  with  the  Manufacturing
Procedures. In such event, the provisions of paragraph 12(c) shall apply.

     13. Indemnities. (a) Cytogen agrees to indemnify and hold Laureate harmless
         -----------
from  any  damages,  liabilities,   losses  and  expenses  (including,   without
limitation,  reasonable attorneys' fees in seeking indemnification  hereunder or
any claim by a third person) and amounts paid in settlement of any claim or suit
of any nature or kind whatsoever  which may be sustained or suffered by Laureate
arising with  respect to paragraph  9(d) hereof or arising out of, based upon or
by reason of, any Cytogen  Supplied  Material not  Conforming  to the  covenant,
representation  and warranty  made by Cytogen in paragraph  11(b) at the time of
receipt at the Facility.

         (b) In   the  event  a   Cytogen  Supplied   Material  does   not  meet
Specifications  or is otherwise  unsuitable for use in the manufacture of Sodium
Acetate,  CYT-351,  CYT-356, Filled ProstaScint Product or Filled Sodium Acetate
after the  receipt  thereof  at the  Facility  by reason of any  action,  act or
activity  by  Laureate  which  does  not



conform to the Cytogen's approved  Specifications,  Laureate SOPs, Cytogen SOPs,
cGMP, the Manufacturing Procedures, the Incoming Acceptance Tests or the Quality
Agreement  (or  Laureate's  failure  to  act  in  conformity  with  any  of  the
foregoing), Laureate's obligation hereunder shall be [**].

         (c) Cytogen  agrees to  defend, indemnify  and hold  Laureate  harmless
from any and all claims by third  persons  or  governmental  entities,  damages,
liabilities,  losses and expenses  (including,  without  limitation,  reasonable
attorney's fees in seeking indemnification hereunder or defending any claim by a
third person or a  governmental  entity) and amounts paid in  settlement  of any
claim  or suit of any  nature  or kind  whatsoever  relating  to the sale of the
Filled ProstaScint Product or Filled Sodium Acetate Product.

         (d) The obligations of the indemnifying  party under this paragraph  13
are conditioned upon the delivery of written notice to the indemnifying party of
any potential claim arising under this paragraph 13 ("Claim") promptly after the
indemnified  party becomes  aware of such claim.  The  indemnifying  party shall
manage  and  control,  at its sole  expense,  the  defense  of the Claim and its
settlement.  The indemnified  party shall cooperate with the indemnifying  party
and may,  at its  option  and  expense,  be  represented  in any such  action or
proceeding.  The indemnifying party shall not be liable for any litigation costs
or expenses incurred by the indemnified party without indemnifying party's prior
written  authorization.  In  addition,  the  indemnifying  party  shall  not  be
responsible for any liability resulting from any settlement or compromise by the
indemnified  party made without the indemnifying  party's prior written consent.

     14. Contact  Individuals.  Each of Laureate  and  Cytogen  shall  designate
         --------------------
an individual ("Laureate Contact Individual" or "Cytogen Contact Individual," as
applicable) who



shall be  responsible  for the day-to-day  contacts  between the parties and who
shall receive  copies of all written  correspondence,  notices and the like with
respect  to a  party's  performance  of  its  obligations  and  responsibilities
hereunder.

     15. No Biohazards. The Laureate Contact  Individual and the Cytogen Contact
         -------------
Individual will establish a standard  operating  procedure to identify materials
that are or may be biohazardous. Materials so identified may not be brought into
the Facility and may not be a Cytogen Supplied Material.

     16. Termination.  (a)  In  addition  to  termination  resulting   from  the
         -----------
expiration of this Agreement in accordance  with paragraph 2, this Agreement can
be  terminated by Laureate for  nonpayment of any sums due hereunder  (remaining
unpaid for more than ninety (90) days following  receipt by Cytogen of notice by
Laureate),  or by either  party with at least sixty (60) days,  advance  written
notice:

         (i)   on account of a material  breach of this  Agreement  by the other
     party, unless the offending party cures the violation before  expiration of
     the notice period; or

         (ii)  when the  other party makes a general  assignment for the benefit
     of its creditors, has a custodian, receiver or any  trustee  appointed  for
     it or  a  substantial  part  of  its  assets  or  commences  any  voluntary
     proceeding under any bankruptcy law; or

         (iii) when a court having jurisdiction over the other party shall enter
     a decree or order for  relief  in any  involuntary  case  under  applicable
     bankruptcy  law and such decree  or order shall  continue  unstayed  and in
     effect for a period of ninety (90) days or more.



         (b) Termination for  any reason by either party under this paragraph 16
will not prejudice that party's remaining contractual rights, including, without
limitation,  rights to  damages,  nor  terminate  the  obligations  set forth in
paragraphs 3, 4, 14 and 18 hereof,  to the extent such  obligations have accrued
according to those terms.

     17. Insurance.  Throughout the term of this Agreement Cytogen shall  obtain
         ---------
and maintain in full force and effect product liability  insurance (issued by an
insurance  company  licensed  to do  business in the State of New Jersey) in the
amount of [**] and cause Laureate to be named as an additional  insured thereon.
Laureate now maintains general liability insurance and property damage liability
insurance in the amount of [**] for the Facility,  and shall cause Cytogen to be
named as an additional  insured  thereon.  Each party shall, at all times during
the term of this Agreement,  maintain in full force and effect and on deposit at
the  office of the other  party,  a  Certificate  of  Insurance  or a  duplicate
original of the  insurance  policy  required  above,  together  with evidence of
payment of all premiums  therefor.  Each such policy shall provide that it shall
not be cancelable without at least thirty (30) days, prior written notice to the
other party.

     18. Confidentiality.  All written information  provided by either  party to
         ---------------
the other hereunder including, but not limited to, volume requirements, pricing,
delivery schedules and process data formulae,  regulatory submissions,  know-how
and other information, including without limitation, proprietary information and
materials  (whether or not patentable)  regarding a party's  technology,  is the
disclosing party's  confidential  proprietary  information.  The receiving party
agrees not to disclose any such information or use such  information  except for
purposes of performance hereunder, for a period of [**] after the termination of
this Agreement with regard to business related information,  and for a period of
[**] with regard to technical information, provided that the receiving party may
use or disclose any such information that it can



demonstrate  through written records:  (1) is already known to it at the time of
disclosure to the receiving  party;  (2) becomes publicly known through no fault
of the receiving  party;  or (3) is disclosed to the receiving  party by a third
party who is free to make such  disclosure.  The  parties  each  agree that they
shall  provide  confidential  information  received from the other party only to
their respective employees,  consultants,  investors,  prospective investors and
advisors  who  have a need  to  know  and  have  an  obligation  to  treat  such
information and materials as confidential  under terms no less  restrictive than
those set forth herein. All confidential and proprietary  information  disclosed
hereunder shall be, at the option of the disclosing party,  immediately returned
to the  disclosing  party,  or destroyed (and such  destruction  certified by an
officer  of the  receiving  party)  upon  the  earlier  of  termination  of this
Agreement, or the request of the disclosing party.  Notwithstanding anything set
forth herein to the contrary, this paragraph 18 shall not prohibit the receiving
party from disclosing  confidential or proprietary information of the disclosing
party that is required to be  disclosed  by the  receiving  party to comply with
applicable  laws,   including  without  limitation  the  rules  and  regulations
promulgated by the FDA or the United States Securities and Exchange  Commission,
or to comply with  governmental  regulations,  provided that the receiving party
provides  prior written notice of such  disclosure to the  disclosing  party and
takes  reasonable and lawful actions to avoid and/or minimize the degree of such
disclosure. Any announcements or similar publicity with respect to the execution
of this  Agreement  shall be agreed upon  between the parties in advance of such
announcement.  The  parties  agree that any such  announcement  will not contain
confidential  business or technical  information  of the other party.  Except as
otherwise  expressly agreed between the parties in writing,  no right is granted
to a party to use in any manner the name of the other  party or any other  trade
name or trademark of the other party.



     19. Notices.  All notices  required to be given under this Agreement  shall
         -------
be deemed  given when  delivered  personally  or when  mailed by  registered  or
certified mail, return receipt requested,  or when sent by Federal Express or an
equivalent  overnight  delivery  service,  addressed  to the  parties  at  their
respective  addresses set forth below or to such other addresses at which notice
shall have been duly given.  It is understood  and agreed that this paragraph 19
is not  intended  to govern the  day-to-day  business  communications  necessary
between the parties in performing the duties, in due course,  under the terms of
this Agreement.

         IF TO CYTOGEN:

         William F. Goeckeler
         Senior Vice President, Operations
         Cytogen Corporation
         650 College Road East
         Princeton,  NJ 08540
         Fax No.: 1-609-452-2317


         WITH A COPY TO:

         William J. Thomas, Esq.
         Senior Vice President and General Counsel
         Cytogen Corporation
         650 College Road East
         Princeton, NJ 08540
         Fax No.:  1-609-452-2317


         IF TO LAUREATE:

         Robert J. Broeze, Ph.D.
         President

         Laureate Pharma L.P.
         201 College Road East
         Princeton, NJ  08540
         Fax No.:  1-609-520-3963


         WITH A COPY TO:

         Lowenstein Sandler PC
         65 Livingston Avenue



         Roseland, New Jersey 07068
         Attention:  John D. Hogoboom
         Telephone: (973) 597-2500
         Facsimile: (973) 597-2400

     20. Non-Exclusivity.  (a)  Laureate  may  render  manufacturing  and  other
         ---------------
services to any other  party and use the  Facility  and  Laureate  personnel  in
furtherance  of rendering  such  services  whether or not such third party is in
competition with Cytogen.  Nothing herein limits or restricts Cytogen from using
any other party in the  manufacture  and supply of any materials,  including the
materials to be supplied by Cytogen hereunder.

         (b) Neither  party  shall,  directly or  through  its  representatives,
solicit for  employment  any officer,  director,  employee or  consultant of the
other  party  during  the  term  of  this  Agreement  and  for  a period of [**]
thereafter.

     21. Entire  Agreement.  (a)  The  Manufacturing  Procedures,  the  Incoming
         -----------------
Acceptance Tests and the Quality Agreement are deemed to be part this Agreement.

         (b) This Agreement constitutes the entire agreement between the parties
in respect of the subject  matter of this  Agreement and supercedes all previous
oral  or  written  negotiations,   commitments,   agreements,   transactions  or
understandings with respect to the subject matter hereof. No modifications to or
supplementation  of this  Agreement,  whether  contained in any purchase  order,
confirmation or otherwise,  shall be effective unless made in writing and signed
by the party to be charged with modification.

     22. Governing Law. This Agreement shall be interpreted in  accordance  with
         -------------
the laws of New Jersey  where it is deemed to have been  executed and where each
party has a place of business.

     23. Assignment.  No right or obligation of either  party hereunder shall be
         ----------
assignable  without the prior written agreement of the other party,  which shall
not be



unreasonably withheld or delayed; otherwise this Agreement shall be binding upon
and inure to the benefit of the parties  hereto and their  respective  permitted
successors  and assigns.  For purposes of this Section 23, an  assignment  shall
include the merger or consolidation of any party with another entity or the sale
of all or substantially  all of such party's equity interests.

     24. Independent Contractors.  The parties  are independent contractors, and
         -----------------------
this Agreement shall not be construed to create between Laureate and Cytogen any
other  relationship such as, by way of example only, that of  employer-employee,
principal-agent,  joint-venturer,  co-partners or any similar relationship,  the
existence of which is expressly  denied by the parties hereto.

     25. No Waiver. A party's  failure to require  another  party to comply with
         ---------
any provision of this  Agreement  shall not be deemed a waiver of such provision
or any other provision of this Agreement.

     26. Force Majeure.  No party shall be liable for the failure to perform its
         -------------
obligations  under this Agreement if such failure is occasioned by a contingency
beyond such party's reasonable control,  including,  but not limited to, acts of
terrorism,  strikes or other labor disturbances,  lockouts,  riots, wars, fires,
floods or  storms.  A party  claiming a right to excuse  performance  under this
paragraph 26 shall  immediately  notify the other party in writing of the extent
of its inability to perform,  which notice shall specify the  occurrence  beyond
its  reasonable  control that prevents such  performance  and an estimate of the
time that the inability to perform is anticipated to last.

     27. Third  Parties.  No  person  not  a party  to  this  Agreement  not  an
         --------------
Affiliate  of a party to this  Agreement  shall  have or  acquire  any rights by
reason  of this Agreement, nor shall



any party to this  Agreement  have any  obligation or  liabilities to such other
person by reason of this  Agreement.

     28. Interpretation.  The  parties  hereto acknowledge  and agree that:  (i)
         --------------
each party and its counsel have reviewed and negotiated the terms and provisions
of this  Agreement  and  have  contributed  to its  revision;  (i)  the  rule of
construction  to the  effect  that any  ambiguities  are  resolved  against  the
drafting party shall not be employed in the  interpretation  of this  Agreement;
and (iii) the terms and provisions of this Agreement  shall be construed  fairly
as to all parties hereto and not in favor of or against any party, regardless of
which party was generally responsible for the preparation of this Agreement.

     29. Singular  Terms.  Except as  otherwise  expressly  provided  herein  or
         ---------------
unless the context  otherwise  requires,  all  references to the singular  shall
include the plural as well.

     30. Headings.  The headings herein are inserted as a  matter of convenience
         --------
only,  and do not define,  limit or describe the scope of this  Agreement or the
intent of the  provisions  hereof and shall not be used to interpret or construe
the terms and provisions of this Agreement.

     31. Counterparts. This Agreement may  be executed  simultaneously in two or
         ------------
more counterparts,  each of which shall be deemed an original, and all of which,
when taken together, shall constitute one and the same instrument. The signature
of any party to any  counterpart  shall be  deemed a  signature  to,  and may be
appended to, any other counterpart.

     32. Severability. This Agreement  is intended  to be  valid  and  effective
         ------------
under any applicable law and, to the extent  permissible  under  applicable law,
shall be construed in a manner to avoid  violation  of or  invalidity  under any
applicable  law.  Should any provisions of this Agreement be or become  invalid,
illegal or unenforceable under any applicable law, the



other  provisions  of this  Agreement  shall not be affected and shall remain in
full force and effect and, to the extent  permissible  under applicable law, any
such  invalid,  illegal  or  unenforceable  provision  shall be  deemed  amended
lawfully to conform with the intent of the parties. Nothing in this paragraph 32
shall   preclude  a  party  hereto  from  bringing  an  action  for  failure  of
consideration in the event a material  provision of this Agreement shall be held
invalid, illegal or unenforceable.

                                 * * * * * * * *





     IN WITNESS  WHEREOF,  the parties  hereto have caused this  Agreement to be
executed by their duly authorized representatives.


LAUREATE PHARMA L.P.                    CYTOGEN CORPORATION

By: Laureate Pharma Inc., its
      General Partner


By  /s/ Robert Broeze                   By /s/ Michael D. Becker
    ------------------------------         -------------------------------------
     Robert Broeze, PhD.                   Michael D. Becker
     President                             President and Chief Executive Officer






                                   Appendix 1
[**]



                                   Appendix II

[**]