Laboratory examination findings on admission revealed elevated serum tumor marker levels: carcinoembryonic antigen (CEA) level of 21.4 ng/mL (normal range: 0–5.0) and carbohydrate antigen 19-9 (CA19-9) level of 804.0 U/mL (normal range: 0–37.0). The gene discussed is CEACAM5; the disease is neoplasm.