S100P and urothelial carcinoma: Positive immunohistochemical markers GATA3, CK20, p63, and either high-molecular weight cytokeratin (HMWCK) or cytokeratin (CK)5/6 can be of value in the differential diagnosis of urothelial carcinoma, while GATA3, S-100P, CK7, CK20, HMWCK, and p63 can help in the diagnosis of the urothelial lineage of variant morphologies [12, 13].