PD-1/PD-L1 inhibitor-related cystitis: clinical features, diagnostic exclusion, and outcomes in one definite and seven probable cases with an updated literature review - Wei Ding; Heqian Liu; Lin Li; Yingqing Liu; Jiawei Wang; Zhonglang Wang; Lingsong Tao; Xiansheng Zhang (Frontiers in Oncology, 2026)