The serum levels of tumor markers were as follows: carcinoembryonic antigen (CEA), 5.0 ng/mL; carbohydrate antigen 19‐9 (CA19‐9), <2.0 ng/mL; neuron‐specific enolase, 13.9 ng/mL; and progastrin‐releasing peptide, 52.1 pg/mL. Here, CEACAM5 is linked to neoplasm.