CEACAM5 and neoplasm: Biochemical blood examinations did not reveal abnormalities, and the levels of the tumor markers carcinoembryonic antigen (CEA), squamous cell carcinoma antigen, Cyfra21-1/cytokeratin 19 fragment, and pro-gastrin-releasing peptide were 3.0 ng/ml, 1.9 ng/ml, 2.1 ng/ml, and 30.9 pg/ml, respectively.