REDWOOD CITY, Calif., June 7, 2010 (GLOBE NEWSWIRE) -- Threshold Pharmaceuticals, Inc. (Nasdaq:THLD) today announced results from Phase 1/2 clinical trials in various solid tumors related to its hypoxia-activated prodrug, TH-302. The results were presented during the American Society for Clinical Oncology (ASCO) Annual Meeting being held in Chicago, IL.