Phio Pharmaceuticals Corp., a a clinical stage biotechnology company, engages in the development of immuno-oncology therapeutics in the United States. The company is developing PH-762, an INTASYL compound in Phase 1b dose-escalating clinical trials to reduce the expression of cell death protein 1 (PD-1), a protein that inhibits T cells’ ability to kill cancer cells; and PH-762 treated double positive tumor infiltrating lymphocytes, which is in Phase 1 clinical trials to treat advanced melanoma and other advanced solid tumors. It is also developing PH-894, an INTASYL compound in IND enabling studies to silence BRD4, a protein that controls gene expression in both T cells and tumor cells, effecting the immune system and the tumor. The company was formerly known as RXi Pharmaceuticals Corporation and changed its name to Phio Pharmaceuticals Corp.