title: Associations between TNF-α polymorphisms and susceptibility to rheumatoid arthritis and vitiligo: a meta-analysis.
abstract: We investigated whether the tumor necrosis factor-a (TNF-α) promoter -238 A/G and -308 A/G polymorphisms are associated with rheumatoid arthritis (RA) and vitiligo susceptibility. MEDLINE and EMBASE databases and a manual search were used to identify articles in which TNF-α polymorphisms were determined in RA or vitiligo patients and controls. Meta-analysis was used to examine the associations between the TNF-α -238 A/G polymorphism and RA and vitiligo using the allelic contrast and dominant models. Fifteen studies (10 RA and 5 vitiligo) involving 3678 cases and 4400 controls were considered. We observed an association between the TNF-α -238 A allele and RA when all subjects were considered [odds ratio (OR) = 0.686, 95% confidence interval (CI) = 0.476-0.968, P = 0.043]. After stratification by ethnicity, we found no association between the TNF-α -238 A allele and RA in European or Asian populations. We observed no association between the TNF-α -308 A allele and vitiligo (OR = 1.787, 95%CI = 0.894-3.573, P = 0.101). However, the adjusted OR by the trim-and-fill technique was significant (OR = 2.064, 95%CI = 1.138- 3.743). After stratification by geographic continent, the TNF-α -308 A allele was significantly associated with vitiligo in Middle Eastern populations (OR = 1.569, 95%CI = 1.224-2.013, P = 3.8 x 10(-5)). The TNF-α -238 A/G polymorphism was associated with RA susceptibility, and the TNF-α -308 A/G polymorphism may be a significant risk factor for vitiligo in Middle Eastern populations.
authors.affiliation: Division of Rheumatology, Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea lyhcgh@korea.ac.kr.
authors.forename: Y H
authors.initials: YH
authors.lastname: Lee
authors.affiliation: The Hospital for Rheumatic Diseases, Hanyang University Medical Center, Seoul, Korea.
authors.forename: S C
authors.initials: SC
authors.lastname: Bae
mesh_terms: D000483:Alleles; D001172:Arthritis, Rheumatoid / Q000235:genetics* / Q000473:pathology; D044466:Asian People / Q000235:genetics; D056726:Genetic Association Studies; D020022:Genetic Predisposition to Disease; D006801:Humans; D020641:Polymorphism, Single Nucleotide; D011401:Promoter Regions, Genetic; D012307:Risk Factors; D014409:Tumor Necrosis Factor-alpha / Q000235:genetics*; D014820:Vitiligo / Q000235:genetics* / Q000473:pathology; D044465:White People / Q000235:genetics
chemical_list: D014409:Tumor Necrosis Factor-alpha