CEACAM5 and squamous cell carcinoma: Blood samples were collected, and the results were as follows: alpha-fetoprotein (AFP), 2.45 ng/mL; carcinoembryonic antigen (CEA), 0.83 ng/mL; CA-125, 103.20 U/mL; CA-199, 4.85 U/mL; and squamous cell carcinoma (SCC), 1.10 ng/mL.