title: CYP2E1 polymorphisms and nasopharyngeal carcinoma risk: a meta-analysis.
abstract: The cytochrome P450 2E1 (CYP2E1) polymorphisms have been implicated in susceptibility to nasopharyngeal carcinoma (NPC). However, the results are inconsistent. The aim of this meta-analysis is to evaluate the association between the CYP2E1 polymorphisms and NPC risk. All eligible case-control studies published up to April 4, 2016 were identified by searching PubMed, Web of Science, CNKI, Wanfang and Weipu databases. The NPC risk associated with the CYP2E1 polymorphism was estimated for each study by odds ratios (OR) together with its 95 % confidence interval (CI), respectively. Seven case-control studies were included. Of those, there were seven studies (1302 cases and 1319 controls) for RsaI/PstI polymorphism and three studies (732 cases and 642 controls) for DraI polymorphism. Overall, a significant association was found for RsaI/PstI polymorphism under recessive and homozygote comparison models (OR = 2.72, 95 % CI 1.73-4.25; OR = 2.64, 95 % CI 1.68-4.16, respectively), while there was no significant association for RsaI/PstI polymorphism under other two genetic models. When stratified by ethnicity, similar results were observed between them. As for DraI polymorphism, we also observed a significant association under recessive and homozygote comparison models, but not for the other two models. This meta-analysis suggests that the CYP2E1 polymorphisms contributed to the susceptibility of NPC, especially in Asian populations.
authors.affiliation: Department of Otolaryngology, Liaocheng People's Hospital, 67 Dongchangxi Road, Liaocheng, 252000, Shandong, China.
authors.forename: Keqing
authors.initials: K
authors.lastname: Yao
authors.affiliation: Department of Otolaryngology, Liaocheng People's Hospital, 67 Dongchangxi Road, Liaocheng, 252000, Shandong, China.
authors.forename: Haiping
authors.initials: H
authors.lastname: Qin
authors.affiliation: Department of Otolaryngology, Liaocheng People's Hospital, 67 Dongchangxi Road, Liaocheng, 252000, Shandong, China. sdlcgongll@163.com.
authors.forename: Lili
authors.initials: L
authors.lastname: Gong
authors.affiliation: Department of Ophthalmology, Liaocheng People's Hospital, Liaocheng, 252000, Shandong, China.
authors.forename: Ran
authors.initials: R
authors.lastname: Zhang
authors.affiliation: Department of Otolaryngology, Liaocheng People's Hospital, 67 Dongchangxi Road, Liaocheng, 252000, Shandong, China.
authors.forename: Lianqing
authors.initials: L
authors.lastname: Li
mesh_terms: D044466:Asian People / Q000235:genetics; D002277:Carcinoma; D019392:Cytochrome P-450 CYP2E1 / Q000235:genetics*; D005819:Genetic Markers; D020022:Genetic Predisposition to Disease; D006801:Humans; D000077274:Nasopharyngeal Carcinoma; D009303:Nasopharyngeal Neoplasms / Q000208:ethnology / Q000235:genetics*; D016017:Odds Ratio; D011110:Polymorphism, Genetic; D012306:Risk
chemical_list: D005819:Genetic Markers; D019392:Cytochrome P-450 CYP2E1
keywords: CYP2E1; Meta-analysis; Nasopharyngeal carcinoma; Polymorphism