CEACAM5 and neoplasm: Concentrations of all tumor markers were also determined and showed an alpha-fetoprotein (AFP) level of 1.65 ng/mL (normal range: 0–9 ng/mL), a carbohydrate antigen 19–9 (CA 19–9) level of 5.59 U/mL (normal range: 0–27 U/mL), and a carcinoembryonic antigen (CEA) level of 0.28 ng/mL (normal range: 0–5 ng/mL).