TARRYTOWN, N.Y. & ORLANDO, Fla.--(BUSINESS WIRE)--Progenics Pharmaceuticals, Inc. (Nasdaq: PGNX) today reported positive preliminary data from an ongoing phase 1 study of PSMA ADC, an antibody-drug conjugate (ADC) designed to selectively deliver chemotherapy to cells that express prostate-specific membrane antigen (PSMA). Antitumor activity, as reflected by clinical and/or laboratory measures, was observed in four of nine patients treated at the highest tested dose of 1.8 mg/kg. PSMA ADC was generally well tolerated in patients treated to date, and patient enrollment continues at a higher dose. Findings were presented at the 2011 Genitourinary Cancers Symposium, a meeting co-sponsored by the American Society of Clinical Oncology (ASCO), the American Society for Radiation Oncology (ASTRO) and the Society of Urologic Oncology (SUO).