CD44 and infiltrating bladder urothelial carcinoma: High‐grade invasive urothelial carcinoma of the bladder, size 3.2 × 2.5 × 1.5 cm, infiltrating the whole layer of bladder wall, nerve (–), vessel (–), sending ureteral margin (–), immunohistochemistry: CK7 (+), CK20 (–), S100P (+), p53 (+), CD44 (+), CK5/6 (+), GATA3 (–), Ki‐67 (60%)