title: [Association of tumor necrosis factor alpha 308 G/A gene promoter polymorphism with the presence of chronic obstructive pulmonary disease: a meta-analysis].
abstract: OBJECTIVE
  To investigate the association between the polymorphism of tumor necrosis factor alpha 308 gene (TNF-alpha-308) promoter and the risk of chronic obstructive pulmonary disease (COPD) using the method of meta-analysis.
  
  
  METHODS
  The database of Medline and the Chinese biomedicine disc (CBM) were searched for published case-control studies of the association between the polymorphism of TNF-alpha-308 gene promoter and COPD. Data were extracted using a standardized form and the meta-analysis was performed.
  
  
  RESULTS
  Eighteen case-control studies, comprising 1606 patients with COPD and 2551 controls (the oriental population: 666 patients with COPD and 898 controls; the Caucasian: 940 patients with COPD and 1653 controls) were included in the meta-analysis. Using a fixed effect model, the pooled result in the oriental population showed that the TNF2 allele was associated with the susceptibility to COPD [odds ratio (OR) = 2.62, 95% confidence interval (95% CI) 2.00 to 3.43]. The OR for COPD susceptibility in TNF1/2 population was significantly increased at 2.44 (95% CI 1.79 to 3.33) compared to the TNF1/1 population. The OR for COPD susceptibility in the TNF1/2 plus TNF2/2 population was significantly increased at 2.78 (95% CI 2.06 to 3.75) compared to the TNF1/1 population. When adjusted for smoking, the result was similar. However, in the Caucasian population, the TNF2 allele was not associated with the susceptibility to COPD (OR = 0.97, 95% CI 0.84 to 1.14). There was no association between the genotype of TNF-alpha-308 and COPD (OR = 0.96, 95% CI 0.79 to 1.16, and OR = 1.03, 95% CI 0.86 to 1.25), compared between the TNF1/2 population, the TNF1/2 plus the TNF2/2 population and the TNF1/1 population respectively. When adjusted for smoking, the result was similar.
  
  
  CONCLUSIONS
  In the oriental population, the TNF2 allele confers a significant risk for developing COPD. There is no association between the polymorphism of TNF-alpha-308 gene promoter and COPD in the Caucasian population.
authors.affiliation: Guangzhou Institute of Respiratory Diseases, the First Affiliated Hospital, Guangzhou Medical College, Guangzhou 510120, China.
authors.forename: Guo-ping
authors.initials: GP
authors.lastname: Hu
authors.forename: Gong-yong
authors.initials: GY
authors.lastname: Peng
authors.forename: Jin-xing
authors.initials: JX
authors.lastname: Hu
authors.forename: Pi-xin
authors.initials: PX
authors.lastname: Ran
mesh_terms: D000483:Alleles; D044466:Asian People / Q000235:genetics; D016022:Case-Control Studies; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease / Q000208:ethnology / Q000235:genetics; D005838:Genotype; D006801:Humans; D015810:Linkage Disequilibrium; D011110:Polymorphism, Genetic; D011401:Promoter Regions, Genetic / Q000235:genetics*; D029424:Pulmonary Disease, Chronic Obstructive / Q000208:ethnology / Q000235:genetics*; D012307:Risk Factors; D012907:Smoking; D014409:Tumor Necrosis Factor-alpha / Q000235:genetics*; D044465:White People / Q000235:genetics
chemical_list: D014409:Tumor Necrosis Factor-alpha