Tumor marker levels were all within the reference values: carcinoembryonic antigen (CEA), 0.9 ng/mL (<5.0 ng/mL); cancer antigen 19-9, 2.6 U/mL (<37.0 U/mL); α-fetoprotein, 1.5 ng/mL (<10.0 ng/mL); sialyl Tn antigen, 17.6 U/mL (<45.0 U/mL); and cancer antigen 72-4, 2.1 U/mL (<6.9 U/mL). Here, CEACAM5 is linked to neoplasm.