CEACAM5 and neoplasm: Serum tumor marker studies showed elevated levels of carcinoembryonic antigen (CEA, 49.3 ng/mL; reference range, < 5.3 ng/mL), carbohydrate antigen 19-9 (CA19-9, 45.0 U/mL; reference range, < 35 U/mL), and alpha-fetoprotein (AFP, 173.2 ng/mL; reference range, < 10 n/mL).