Tumor marker levels were also within the normal range: carcinoembryonic antigen (CEA) concentration was 1.3 ng/mL [normal range < 5.0 ng/mL] and carbohydrate antigen 19–9 (CA19-9) level was 14.7 U/mL [normal range < 37.0 ng/mL]. Here, CEACAM5 is linked to neoplasm.