Moreover, numerous studies have been conducted on several tumor markers related to neuroblastoma, including neuron-specific enolase (NSE) [7, 8], vanillylmandelic acid (VMA) [9, 10], lactate dehydrogenase (LDH) [11], homovanillic acid (HVA) [12, 13] and ferritin [14, 15]. The gene discussed is ENO2; the disease is neoplasm.