Ovarian cancer may be caused by a build-up of genetic defects, or damaged genes within the cells of the body. Because the genes are damaged, the body is unable to produce a group of proteins called cytokines which are used by the immune system to fight cancer and some infections. The investigational gene transfer agent EGEN-001 (phIL-12-005/PPC) contains the human gene for interleukin-12 [IL-12] (a cytokine) in a special carrier system designed to enter the cells and help the body produce cytokines.