ARID1A and renal pelvis/ureter urothelial carcinoma: Mutations in UTUC and bladder UC differed only for HRAS, CDKN2B, TP53, RB1, and ARID1A when investigated in a set of 59 high‐grade UTUC and 102 high‐grade bladder UC (Sanford et al., 2015; Sfakianos et al., 2015).