Pain Therapeutics, Inc. is a biopharmaceutical company that develops drugs. The Company has four drug candidates in clinical programs, including REMOXY, abuse-resistant hydromorphone, abuse-resistant hydrocodone and a radio-labeled monoclonal antibody to treat metastatic melanoma. It is also working on a new treatment for patients with hemophilia. It has collaboration agreement with King Pharmaceuticals, Inc. (King) develops and commercializes REMOXY and other opioid painkillers. The Company and King jointly managed a Phase III clinical program and New Drug Application (NDA) submission for REMOXY. It is also developing a pipeline of drug candidates in the area of oncology and hematology. It owns all commercial rights to its pipeline of drug candidates in oncology and hematology. As of December 31, 2010, it leased approximately 30,700 square feet of space in San Mateo, California and all of its operations are located in San Mateo.