Serum tumor markers were as follows: alpha-fetoprotein (AFP), 8.51 ng/mL; carcinoembryonic antigen (CEA), 5.79 ng/mL; neuron-specific enolase (NSE), 34.40 ng/mL; and pro-gastrin-releasing peptide (ProGRP), 76.50 ng/mL. Here, GRP is linked to neoplasm.