Laboratory analysis revealed normal serum levels of β-human chorionic gonadotropin (β-hCG; < 1.2 IU/L) and tumor markers, including carbohydrate antigen 125 (CA 125), carcinoembryonic antigen (CEA), CA 19-9, CA 15-3, and α-fetoprotein; all of these biomarkers had consistently negative values. The gene discussed is CEACAM5; the disease is neoplasm.