We retrospectively analyzed medical records of patients with mUC who received an investigational therapy at the phase 1 clinic...Patients harboring a TP53 alt, compared to no alt, had a shorter median PFS of 3.2m vs 9.6 m (HR = 2.738 [1.247 - 6.011], p = 0.0121). On the contrary, median PFS was longer in FGFR alt, compared to no alt, 6.3m vs 3.2m (HR = 0.4662 [0.224 - 0.971], p = 0.0415).