Cassava Sciences Inc is a clinical-stage biotechnology company engaged in developing a scientific approach for the treatment and detection of Alzheimer's disease. It is also developing an experimental biomarker diagnostic PTI-125 to detect Alzheimer's disease with the help of a blood test.Pain Therapeutics Inc is a biopharmaceutical company that develops novel drugs. The Company has four drug candidates in clinical programs, including Remoxy, Oxytrex, PTI-202 and a novel radio-labeled monoclonal antibody to treat metastatic melanoma.