CEACAM5 and neoplasm: Tumor marker concentrations were carbohydrate antigen (CA) 19-9: 12.1 U/mL (normal range: ≤37.0 U/mL); carcinoembryonic antigen (CEA): 4.1 ng/mL (normal range: ≤5.0 U/mL); and serum soluble interleukin-2 receptor: 312 U/mL (normal range: 122–496 U/mL).