UNITED STATES

                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549

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


                                    FORM 8-K

                                 CURRENT REPORT

                     PURSUANT TO SECTION 13 OR 15(D) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

            Date of report (Date of earliest event reported): May 4, 2004
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                              CYTOGEN CORPORATION
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               (Exact Name of Registrant as Specified in Charter)

           Delaware                     000-14879                 22-2322400
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(State or Other Jurisdiction    (Commission File Number)      (I.R.S. Employer
      of Incorporation)                                      Identification No.)

650 College Road East, CN 5308, Suite 3100, Princeton, NJ           08540
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         (Address of Principal Executive Offices)                (Zip Code)

       Registrant's telephone number, including area code: (609) 750-8200
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          (Former Name or Former Address, if Changed Since Last Report)




ITEM 12.  RESULTS OF OPERATIONS AND FINANCIAL CONDITION.

         On May 4, 2004, Cytogen Corporation announced its financial results for
the quarter  ended  March 31,  2004,  and  reaffirmed  its  previously  provided
financial  guidance  for 2004.  The full text of the May 4, 2004  press  release
issued in connection  with the  announcement is attached as Exhibit 99.1 to this
Current Report on Form 8-K.

         The information in this Form 8-K and the exhibit  attached hereto shall
not be deemed "filed" for purposes of Section 18 of the Securities  Exchange Act
of 1934 (the  "Exchange  Act") or otherwise  subject to the  liabilities of that
section,  nor shall it be deemed  incorporated  by reference in any filing under
the Securities Act of 1933 or the Exchange Act, except as expressly set forth by
specific reference in such a filing.





                                   SIGNATURES



         Pursuant to the  requirements  of the Securities  Exchange Act of 1934,
the  Registrant  has duly  caused  this report to be signed on its behalf by the
undersigned hereunto duly authorized.

                                 CYTOGEN CORPORATION



                                 By:  /s/ Michael D. Becker
                                      --------------------------------------
                                      Michael D. Becker
                                      President and Chief Executive Officer

Dated:  May 4, 2004






                                  EXHIBIT INDEX


                  Exhibit No.      Description
                  -----------      -----------

                     99.1          Press release dated May 4, 2004