CEACAM5 and neoplasm: Serum thyroglobulin and pro-gastrin-releasing peptide were elevated (93.2ng/mL and 75.2pg/mL, respectively), whereas other tumor markers, including carcinoembryonic antigen (CEA), carbohydrate antigen 19–9 (CA19-9), sialyl Lewis X and neuron-specific enolase, were all negative.