Refining <scp>BCG</scp> ‐failure classifications in non‐muscle‐invasive bladder cancer

Under IBCG definitions, BCG-unresponsive and BCG-exposed NMIBC have similarly poor outcomes. A refined classification reveals prognostic heterogeneity, with late relapses after adequate BCG demonstrating outcomes comparable to BCG-unresponsive, and very late relapses conferring better prognosis.