Routine laboratory testing revealed normal levels of tumor markers such as carcinoembryonic antigen (CEA), alpha-fetoprotein (AFP), carbohydrate antigen 19-9, carbohydrate antigen 12-5, and carbohydrate antigen 153, but an elevated level of neuron-specific enolase (21.03 ng/mL, normal: 0–16.3 ng/mL). The gene discussed is CEACAM5; the disease is neoplasm.