FGFR3 and renal pelvis/ureter urothelial carcinoma: Specifically, 9/12 (75%) of the patients showed high FGFR3 expression in UTUC metachronous MIBC, while 13 (22.4%) out of 58 patients showed high FGFR3 expression in bladder primary MIBC (p < 0.001; Figure 3b,c).