CEACAM5 and neoplasm: Serum tumor marker analysis demonstrated negative results for carcinoembryonic antigen (CEA), alpha-fetoprotein (AFP), and carbohydrate antigen 19-9 (CA19-9), with all values within normal reference ranges (CEA = 1.7 ng/mL, AFP = 3.91 ng/mL, CA19-9 = 19.6 U/mL).