RecruitingPhase 2Drug trialA Trial of Durvalumab (MEDI4736) Plus Monalizumab in Non-Muscle-Invasive Bladder CancerThis is a phase 2 open-label two cohort study of durvalumab plus monalizumab in patients with BCG-unresponsive or BCG-exposed CIS NMIBC. Arm A will enroll 43 participants who have cancer in situ (CIS) with or without high grade papillary urothelial cancer. Arm B will enroll 17 participants who do not have cancer in situ (CIS) but do have high grade papillary urothelial cancer. Eligible patients will be enrolled to receive up to 13 cycles of monthly combination of monalizumab and durvalumab. Both monalizumab and durvalumab will be administered intravenously (IV) every 28 days.