FGFR3 and renal pelvis/ureter urothelial carcinoma: On the other hand, in a study comparing high-grade UTUC (n = 59) with UBUC (n = 102), overall landscape of genetic alterations was similar in both groups, although FGFR3 were more frequently altered in UTUC than in UBUC (36% vs. 22%, respectively) [22].