We showed that CXCL13 was independently associated with both prolonged survival (HR = 0.8, 95% CI [0.68-0.94]) and objective response (p < 0.0001) in patients treated with ICI, at the difference of others immunological signatures...These results support that CXCL13 expression, as a surrogate for tumour TLS, is a relevant candidate predictive biomarker of response to ICI for patients with advanced-stage bladder cancer.