Combination of Ipi/Nivo Plus Sacituzumab Govitecan in Metastatic Cisplatin Ineligible Urothelial Carcinoma Patients

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.