Pembrolizumab and Carboplatin in Treating Patients With Relapsed or Refractory Ovarian, Fallopian Tube, or Primary Peritoneal Cancer

This phase I/II trial studies how well pembrolizumab and carboplatin work in treating patients with ovarian, fallopian tube, or primary peritoneal cancer that has come back (relapsed) or has not responded to previous treatment (refractory). Immunotherapy with monoclonal antibodies, such as pembrolizumab, may help the body's immune system attack the cancer, and may interfere with the ability of tumor cells to grow and spread. Drugs used in chemotherapy, such as carboplatin, work in different ways to stop the growth of tumor cells, either by killing the cells, by stopping them from dividing, or by stopping them from spreading. Giving pembrolizumab and carboplatin with platinum resistant chemotherapy may work better than platinum chemotherapy alone in treating patients with ovarian, fallopian tube, or primary peritoneal cancer.