CEACAM5 and neoplasm: Serum level of the tumor marker carcinoembryonic antigen (CEA), 4.7 ng/ml, was within normal range (<5.0 ng/ml), while serum levels of the tumor markers carbohydrate antigen 19-9 (CA19-9), 51.1 U/ml (<37 U/ml), DUPAN-2, 53 U/ml (<25 U/ml), and SPAN-1, 45.9 U/ml (<10 U/ml), were slightly elevated.