Immunohistochemical study revealed tumor cells positive for cytokeratin 7 (CK7) (Fig. 2c), cytokeratin 20 (CK20) (Fig. 2d), p63 (Fig. 3f), epithelial membrane antigen (EMA), uroplakin III (Fig. 3e), and GATA-3. The gene discussed is KRT20; the disease is neoplasm.