Veliparib and Radiation Therapy in Treating Patients With Advanced Solid Malignancies With Peritoneal Carcinomatosis, Epithelial Ovarian, Fallopian, or Primary Peritoneal Cancer

This phase I trial studies the side effects and best dose of veliparib when given together with radiation therapy in treating patients with advanced solid malignancies (abnormal cells divide without control and can invade nearby tissues) with peritoneal carcinomatosis, epithelial ovarian, fallopian, or primary peritoneal cancer. Veliparib may stop the growth of tumor cells by blocking some of the enzymes needed for cell growth. Radiation therapy uses high energy x rays to kill tumor cells. Giving veliparib with radiation therapy may kill more tumor cells.