The serum tumor markers Carcinoembryonic antigen (CEA), Neuron-specific enolase (NSE), Cancer antigen 125 (CA 125), Human epididymis protein 4 (HE4) and Carbohydrate antigen (CA 19–9) were analyzed retrospectively and clinical follow-up data were collected from patient charts. The gene discussed is ENO2; the disease is neoplasm.