Adult Aged Aged 80 and over B7-H1 Antigen/genetics/*immunology Female Humans Immune Checkpoint Inhibitors/*administration & dosage *Immunotherapy Male Middle Aged Programmed Cell Death 1 Receptor/genetics/*immunology Progression-Free Survival Randomized Controlled Trials as Topic Treatment Outcome Urinary Bladder Neoplasms/genetics/immunology/mortality/*therapy efficacy immunotherapy meta-analysis safety urothelial cancer this study.