CEACAM5 and neoplasm: Interestingly, laboratory studies found high serum levels of tumor markers, including carcinoma antigen (CA) 125 (209.2 U/ml, normal range < 35 U/ml), CA199 (459.3 U/ml, normal range < 37 U/ml), CA 153 (35.95 U/ml, normal range < 25 U/ml), carcinoembryonic antigen (CEA, 48 ng/ml, normal range < 10 U/ml) and neuron-specific enolase (36.8 ng/ml, normal range < 16.3 U/ml).