Nivolumab and ipilimumab are antibodies (a type of human protein) that work to stimulate your body's immune system to fight tumor cells. The FDA (the U.S. Food and Drug Administration) has approved nivolumab as a treatment option for this disease; however, the FDA has not approved the way nivolumab and ipilimumab are being administered in this study. Ipilimumab is FDA approved for the treatment of melanoma (skin cancer) and has been previously studied in renal cell cancer.