Purpose: To explore associations of CYP2E1 and NAT2 polymorphisms with lung cancer susceptibilityamong Mongolian and Han populations in the Inner Mongolian region. Materials and
Methods: CYP2E1 andNAT2 polymorphisms were detected by PCR-RFLP in 930 lung cancer patients and 1000 controls.
Results: (1)Disequilibrium of the distribution of NAT2 polymorphism was found in lung cancer patients among Han andMongolian populations (p=0.031). (2) Lung cancer risk was higher in individuals with c1, D allele of CYP2E1RsaI/PstI, DraI polymorphisms and slow acetylation of NAT2 (c1 compared with c2, OR=1.382, 95%CI: 1.178-1.587, p=0.003; D compared with C, OR=1.241, 95%CI: 1.053-1.419, P<0.001; slow acetylation compared withrapid acetylation, OR=1.359, 95%CI:1.042-1.768, p=0.056) (3) Compared with c2/c2 and rapid acetylation, c1/c1together with slow acetylation synergetically increased risk of lung cancer 2.83 fold. (4) Smokers with CYP2E1c1/c1, DD, and NAT2 slow acetylation have 2.365, 1.916, 1.841 fold lung cancer risk than others with c2/c2, CCand NAT2 rapid acetylation, respectively. (5) Han smokers with NAT2 slow acetylation have 1.974 fold lungcancer risk than others with rapid acetylation.
Conclusions: Disequilibrium distribution of NAT2 polymorphismwas found in lung cancer patients among Han and Mongolian populations. Besides, Han smokers with NAT2slow acetylation may have higher lung cancer risk compared with rapid acetylation couterparts. CYP2E1 c1/c1, DD and NAT2 slow acetylation, especially combined with smoking, contributes to the development of lungcancer. CYP2E1 c1/c1 or DD genotype and NAT2 slow acetylation have strong synergistic action in increasinglung cancer risk.