EXHIBIT 99.1



                                  CERTIFICATION


     I, Michael D. Becker, certify that:

1)       I have reviewed this annual report on Form 10-K of Cytogen Corporation;

2)       Based on my  knowledge,  this annual report does not contain any untrue
         statement of a material fact or omit to state a material fact necessary
         to make the statements made, in light of the circumstances  under which
         such  statements  were made, not misleading  with respect to the period
         covered by this annual report;

3)       Based on my knowledge,  the financial  statements,  and other financial
         information  included  in this  annual  report,  fairly  present in all
         material  respects the financial  condition,  results of operations and
         cash flows of the  registrant as of, and for, the periods  presented in
         this annual report;

4)       The registrant's  other  certifying  officers and I are responsible for
         establishing  and  maintaining  disclosure  controls and procedures (as
         defined in Exchange Act Rules 13a-14 and 15d-14) for the registrant and
         have:

                    a) designed  such  disclosure  controls  and  procedures  to
                    ensure that material information relating to the registrant,
                    including its consolidated subsidiaries, is made known to us
                    by others  within those  entities,  particularly  during the
                    period in which this annual report is being prepared;

                    b)  evaluated   the   effectiveness   of  the   registrant's
                    disclosure  controls and  procedures  as of a date within 90
                    days prior to the filing  date of this  annual  report  (the
                    "Evaluation Date"); and

                    c) presented in this annual report our conclusions about the
                    effectiveness  of the  disclosure  controls  and  procedures
                    based on our evaluation as of the Evaluation Date;

5)       The registrant's other certifying officers and I have disclosed,  based
         on our most recent  evaluation,  to the  registrant's  auditors and the
         audit  committee  of  registrant's   board  of  directors  (or  persons
         performing the equivalent function):

                    a) all  significant  deficiencies in the design or operation
                    of  internal  controls  which  could  adversely  affect  the
                    registrant's  ability  to  record,  process,  summarize  and
                    report   financial   data  and  have   identified   for  the
                    registrant's  auditors any material  weaknesses  in internal
                    controls; and

                    b)  any  fraud,  whether  or  not  material,  that  involves
                    management or other employees who have a significant role in
                    the registrant's internal controls; and

6)       The registrant's other certifying officers and I have indicated in this
         annual report whether or not there were significant changes in internal
         controls or in other factors that could  significantly  affect internal
         controls  subsequent  to  the  date  of  our  most  recent  evaluation,
         including   any   corrective   actions   with  regard  to   significant
         deficiencies and material weaknesses.




                                       By:  /s/ Michael D. Becker
                                           -------------------------------------
     Date:     March 28, 2003              Michael D. Becker
                                           President and Chief Executive Officer




<PAGE>


                                  CERTIFICATION


     I, Thu A. Dang, certify that:

1)       I have reviewed this annual report on Form 10-K of Cytogen Corporation;

2)       Based on my  knowledge,  this annual report does not contain any untrue
         statement of a material fact or omit to state a material fact necessary
         to make the statements made, in light of the circumstances  under which
         such  statements  were made, not misleading  with respect to the period
         covered by this annual report;

3)       Based on my knowledge,  the financial  statements,  and other financial
         information  included  in this  annual  report,  fairly  present in all
         material  respects the financial  condition,  results of operations and
         cash flows of the  registrant as of, and for, the periods  presented in
         this annual report;

4)       The registrant's  other  certifying  officers and I are responsible for
         establishing  and  maintaining  disclosure  controls and procedures (as
         defined in Exchange Act Rules 13a-14 and 15d-14) for the registrant and
         have:

                    a) designed  such  disclosure  controls  and  procedures  to
                    ensure that material information relating to the registrant,
                    including its consolidated subsidiaries, is made known to us
                    by others  within those  entities,  particularly  during the
                    period in which this annual report is being prepared;

                    b)  evaluated   the   effectiveness   of  the   registrant's
                    disclosure  controls and  procedures  as of a date within 90
                    days prior to the filing  date of this  annual  report  (the
                    "Evaluation Date"); and

                    c) presented in this annual report our conclusions about the
                    effectiveness  of the  disclosure  controls  and  procedures
                    based on our evaluation as of the Evaluation Date;

5)       The registrant's other certifying officers and I have disclosed,  based
         on our most recent  evaluation,  to the  registrant's  auditors and the
         audit  committee  of  registrant's   board  of  directors  (or  persons
         performing the equivalent function):

                    a) all  significant  deficiencies in the design or operation
                    of  internal  controls  which  could  adversely  affect  the
                    registrant's  ability  to  record,  process,  summarize  and
                    report   financial   data  and  have   identified   for  the
                    registrant's  auditors any material  weaknesses  in internal
                    controls; and

                    b)  any  fraud,  whether  or  not  material,  that  involves
                    management or other employees who have a significant role in
                    the registrant's internal controls; and

6)       The registrant's other certifying officers and I have indicated in this
         annual report whether or not there were significant changes in internal
         controls or in other factors that could  significantly  affect internal
         controls  subsequent  to  the  date  of  our  most  recent  evaluation,
         including   any   corrective   actions   with  regard  to   significant
         deficiencies and material weaknesses.




                                       By:  /s/ Thu A. Dang
                                            ------------------------------------
     Date:     March 28, 2003               Thu A. Dang
                                            Vice President, Finance
                                            Principal Financial Officer