The phase I component of this study will evaluate fixed doses of ipilimumab and nivolumab (3 mg/kg and 1 mg/kg, respectively) IV every 3 weeks x 4 cycles combined with a starting dose of sacituzumab govitecan Level 1 of 8 mg/kg IV days 1,8 every 3 weeks (1 cycle) x 4 cycles. One dose escalation to 10 mg/kg and one dose reduction to dose level minus 1 of sacituzumab govitecan 6 mg/kg days 1,8 every 3 weeks is allowed.~The phase II component will be conducted as two-stage trial enrolling 34 patients with a futility interim analysis after stage 1 (13 patients). After 4 cycles, patients will continue maintenance nivolumab 360 mg IV every Q 21 days along with RP2 dose of SG D1,8 Q21 days till progression of disease or intolerable toxicities or patient decision. Radiographic imaging is performed every 12 weeks to assess response.
The purpose of this study is to see how well the study drugs called Ipilimumab plus Nivolumab (IPI-NIVO) work when added to another study drug called Sacituzumab Govitecan for people who have metastatic bladder cancer.