Infinity Pharmaceuticals, Inc. engages in the discovery and development of medicines for the treatment of cancer and related conditions in the United States. Its lead product candidate includes IPI-504 (retaspimycin hydrochloride), an intravenously-administered small molecule inhibitor of heat shock protein 90 (Hsp90). The Company is conducting an international Phase II clinical trial of IPI-504 in combination with Herceptin in patients with HER2-positive metastatic breast cancer; a Phase II clinical trial of IPI-504 in patients with advanced non-small cell lung cancer; and a Phase I clinical trial of IPI-504 in combination with Taxotere in patients with advanced solid tumors. Its products under Phase I clinical trial comprise IPI-493, an orally-delivered inhibitor of Hsp90, in patients with advanced solid tumors; IPI-926 for patients with advanced and/or metastatic solid tumors; and IPI-940, an orally-delivered inhibitor of fatty acid amide hydrolase for the treatment of neuropathic and inflammatory pain.