Serum levels of tumor markers such as carbohydrate antigen 19-9 (25.7 U/ml, normal range < 37 U/ml) and neuron-specific enolase (9.4 ng/ml, normal range < 16.3 ng/ml) were within the normal ranges, while the carcinoembryonic antigen level was slightly increased (5.6 ng/ml, normal range < 5.0 ng/ml). Here, ENO2 is linked to neoplasm.