title: [Meta-analysis of association of tumor necrosis factor alpha-308 gene promoter polymorphism with gastric cancer].
abstract: OBJECTIVE
  To assess the association between tumor necrosis factor-alpha (TNF-alpha) gene promoter region -308 gene polymorphisms and gastric cancer (GC) susceptibility.
  
  
  METHODS
  Published work about TNF-alpha-308 and GC from PubMed, EMBASE, Cochrane library in English and from Wanfang, CBM in Chinese were searched for relevant articles published by the end of July, 2009. Thirty-nine relevant articles were selected and 26 of them met the criteria. The correlated index was extracted for aggregate analysis in RevMan 4.2.
  
  
  RESULTS
  There were 5225 GC patients and 8473 controls for TNF-alpha-308 in 26 papers. Overall, allele contrast (G:A and AA:GG) genotype of TNF-alpha-308 polymorphisms produced significant results in worldwide populations, the OR values were 0.85 (95%CI: 0.76 - 0.96, P = 0.01) and 1.19 (95%CI: 1.01 - 1.39, P = 0.03). Subgroup analysis showed that OR values of G:A and AA:GG in west population were 0.79 (95%CI: 0.70 - 0.89, P < 0.01) and 1.26 (95%CI: 1.04 - 1.52, P = 0.02), while in east populations subgroup analysis, the OR was 0.97 (95%CI: 0.75 - 1.26, P = 0.84). No significant association was observed in non-cardia GC and Helicobacter pylori positive GC, the OR values were 0.90 (95%CI: 0.79 - 1.02, P = 0.10) and 1.08 (95%CI: 0.62 - 1.88, P = 0.79).
  
  
  CONCLUSIONS
  TNF-alpha-308 A allele and AA genotype were associated with a statistically significant increased risk of gastric cancer in western people.
authors.affiliation: Department of General Surgery, Wuxi People's Hospital of Nanjing Medical University, Wuxi 214023, China. lphty1_1@yahoo.com.cn
authors.forename: Pei-hua
authors.initials: PH
authors.lastname: Lu
authors.forename: Yun
authors.initials: Y
authors.lastname: Tang
authors.forename: Chen
authors.initials: C
authors.lastname: Li
authors.forename: Wei
authors.initials: W
authors.lastname: Shen
authors.forename: Lü
authors.initials: L
authors.lastname: Ji
authors.forename: Yu-jiang
authors.initials: YJ
authors.lastname: Guo
authors.forename: Guo-qing
authors.initials: GQ
authors.lastname: Tao
mesh_terms: D044466:Asian People / Q000235:genetics; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006801:Humans; D011110:Polymorphism, Genetic; D013274:Stomach Neoplasms / Q000235:genetics*; D014409:Tumor Necrosis Factor-alpha / Q000235:genetics*
chemical_list: D014409:Tumor Necrosis Factor-alpha