ERBB2 and urothelial carcinoma: The histological analysis of a retroperitoneal lymph node led to the diagnosis of urothelial carcinoma, with immunohistochemical staining positive for GATA3, CK7, and CK20 (CK20+/), a negative expression of estrogen receptor and HER2 (HER2 0), and a PDL1 level at 15% (Figure 2A–F).