CEACAM5 and neoplasm: Regarding tumor markers, among those with available data, 50.6% had carcinoembryonic antigen (CEA) levels ≥ 4.36 ng/mL (n = 180), and 49.4% had carbohydrate antigen 19-9 (CA19-9) levels ≥ 20.90 U/mL (n = 174).