ENO2 and Burkitt lymphoma: Burkitt lymphoma was suspected; however, levels of AFP (alpha-fetoprotein), HCG (human chorionic gonadotropin), and NSE (neuron-specific enolase) showed no significant elevation: AFP 1.84 ng/mL (normal range: <12 ng/mL), HCG <0.1 mIU/mL (normal range: <5 mIU/mL), and NSE 22.9 ng/mL (normal range: 12.5-25 ng/mL).