ENO2 and neoplasm: Serum tumor markers such as sIL-2R (soluble interleukin-2 receptor) and TK (thymidine kinase) were elevated to 2870 U/ml and 15 U/L, respectively, but CEA (Carcinoembryonic Antigen), CA 19-9 (Carbohydrate Antigen 19-9) and NSE (Neuron-specific enolase) were normal.