A Study of Nivolumab or Nivolumab Plus Experimental Medication BMS-986205 With or Without Bacillus Calumette-Guerin (BCG) in BCG Unresponsive Bladder Cancer That Has Not Invaded Into the Muscle Wall of the Bladder

Inclusion Criteria

• Pathologically demonstrated BCG-unresponsive, carcinoma in situ (CIS)-containing high-risk non-muscle-invasive bladder cancer (NMIBC) defined as CIS with or without papillary component
• Participants must have CIS to be eligible.
• Predominant histologic component (> 50%) must be urothelial (transitional cell) carcinoma
• Eastern Cooperative Oncology Group (ECOG) performance status 0-1

Exclusion Criteria

• Sign of locally advanced disease or metastatic bladder cancer
• Urothelial cancer (UC) in the upper genitourinary tract (kidneys, renal collecting systems, ureters) within 24 months of enrollment
• Prior immuno-oncology therapy Other protocol-defined inclusion/exclusion criteria apply