Exhibit 99.1


                                  Certification

         Pursuant to 18 U.S.C. ss. 1350, the undersigned officer of Progenics
Pharmaceuticals, Inc. (the "Company"), hereby certifies, to such officer's
knowledge, that the Company's Quarterly Report on Form 10-Q for the quarter
ended June 30, 2002 (the "Report") fully complies with the requirements of
Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934
and that the information contained in the Report fairly presents, in all
material respects, the financial condition and results of operations of the
Company.




Dated:   August 14, 2002                  /s/ PAUL J. MADDON
                                          ---------------------------
                                          Paul J. Maddon
                                          Chairman and Chief Executive Officer