CEACAM5 and neoplasm: Serum tumor marker testing revealed elevated CEA (8.1 ng/mL) level but normal CA19-9 (33.5 U/mL) level, squamous cell carcinoma antigen (2.3 ng/mL), neuron-specific enolase (15.4 ng/mL), cytokeratin fragment (1.4 ng/mL), and pro-gastrin-releasing peptide (40.5 pg/mL).