CEACAM5 and neoplasm: Serum tumor marker analysis revealed a slight elevation in carbohydrate antigen 125 (CA125, 36.1 U/ml; reference range, 0-35 U/ml), while levels of carcinoembryonic antigen (CEA), carbohydrate antigen 19-9 (CA 19-9), alpha-fetoprotein (AFP), and beta-human chorionic gonadotropin (b-HCG) remained within normal limits.