CEACAM5 and neoplasm: However, tumor markers were elevated: the carcinoembryonic antigen (CEA) level was 2.50 ng/mL (3 months earlier 2.43 ng/mL), and the carbohydrate antigen 19-9 (CA19-9) level was 50.61 U/mL (3 months earlier 33.51 U/mL).