Immunohistochemistry (IHC) tumor was positive to cytokeratin (CK) 7, CK20, CKAE1AE3, carcinoembryonic antigen (CEA), and negative to thyroid trancription factor 1(TTF1) and littoral cell angioma (LCA) (Figure 2). The gene discussed is CEACAM5; the disease is neoplasm.