Vadim Koshkin, MD, UCSF Helen Diller Family Comprehensive Cancer Center, San Francisco, CA, discusses the use of TERT promoter (TERTp) mutations as prognostic markers in patients with advanced urothelial carcinoma who have received treatment with immune checkpoint inhibitors (ICIs). Reliable prognostic factors are lacking for locally advanced or metastatic urothelial cancer (aUC). A retrospective analysis of 78 patients with aUC who had previously been treated with ICIs found that the presence of a TERTp mutation was an independent predictor of overall survival in patients with aUC who are treated with ICIs. This interview took place during the 2021 Genitourinary Cancers Symposium.