On examining the serum levels of tumor markers, normal carcinoembryonic antigen (CEA) (3.0 ng/mL; normal range, −5.0 ng/mL) and elevated carbohydrate antigen 19-9 (CA19-9) (269 kU/mL; normal level, −37 kU/mL) levels were observed as shown in Table 1. This evidence concerns the gene CEACAM5 and neoplasm.