6Hildesheim A, Levine PH. Etiology of nasopharyngeal carcinoma: a review [J]. Epidemiol Rev, 1993, 15: 466-485.
7Yoo JSH, Guengerich FP, Yang CS. Metabolism of N-nitrosodialkylamines by human liver microsomes [ J]. Cancer Res, 1988,48:1499-504.
8Koop DR. Oxidative and reductive metabolism by cytochrome P450 2El [J]. FASEBJ, 1992, 6(2) : 724-730.
9Botto F, Seree E, el Khyari S, et al. Tissue-specific expression and methylation of the human CYP2El gene [J]. Biochem Pharmacol, 1994, 48: 1095-103.
10Chen ZC, Pan SC, Yao KT. Chemical transformation of human embryonic nasopharyngeal epithelial cells in vitro [J]. IARC SciPubl, 1991, (105) : 434-438.