KRT7 and neoplasm: Submitted immunohistochemical stains were reviewed and show that the tumor cells in the biopsy specimen are positive for CK8/18 while negative for AE1/3, CD34, high molecular weight cytokeratin, CK20, RCC, desmin, myosin, smooth muscle actin (SMA), S100, Melan A, cytokeratin 7 (CK7), and GATA3.