CYP2A13 and nasopharyngeal carcinoma: While no association between polymorphism of CYP2A13 and NPC susceptibility was found in a Taiwan cohort [62] and Cantonese population [63], polymorphism of CYP2E1 was found to be linked to NPC risk in several studies, including a case–control study conducted in Taiwan [64,65,66,67,68].