title: Association of tumor necrosis factor genetic polymorphism with chronic atrophic gastritis and gastric adenocarcinoma in Chinese Han population.
abstract: OBJECTIVE
  To investigate the association of TNF polymorphisms with chronic atrophic gastritis (CAG) and gastric adenocarcinoma in Chinese Han patients.
  
  
  METHODS
  The TNFa-e 5 microsatellites and 3 RFLP sites were typed using PCR technique, followed by high-voltage denaturing PAGE with silver staining and restriction enzyme digestion respectively in specimens from 53 patients with CAG and 56 patients with gastric adenocarcinoma and 164 healthy controls. The PCR products were cloned and sequenced.
  
  
  RESULTS
  The frequency of TNF-beta Ncol*1/2 genotype was higher in patients with chronic atrophic gastritis than in healthy controls, but no significant difference was observed (60.38% vs 46.34%, P=0.076). The frequency of TNa10 allele was significantly higher in patients with chronic atrophic gastritis than in healthy controls (19.81% vs 11.89%, P=0.04). However, it did not relate to age, gender, atrophic degree or intestinal metaplasia in patients with chronic atrophic gastritis. The frequency of TNF-beta Ncol*1/2 and d2/d6 genotypes were significantly higher in patients with gastric adenocarcinoma than in healthy individuals (P>0.05). However, TNF-beta Ncol*1/2 and d2/d6 genotypes did not relate to age, gender, grade of differentiation and clinicopathologic stage in patients with gastric adenocarcinoma. The frequency of TNFa6b5c1 haplotype homozygote was significantly lower in patients with gastric adenocarcinoma than in healthy controls (1.79% vs 15.85%, P=0.006).
  
  
  CONCLUSIONS
  TNFa10 allele may be a risk factor for chronic atrophic gastritis. TNF-beta Ncol*1/2 and d2/d6 genotypes are associated with the susceptibility to gastric adenocarcinoma, whereas TNFa6b5c1 haplotype homozygote may contribute to the resistance against gastric adenocarcinoma.
authors.affiliation: Department of Gastroenterology, Zhejiang Provincial People's Hospital, Hanzhou 310014, Zhejiang Province, China. feibaoying6924@tom.com
authors.forename: Bao-Ying
authors.initials: BY
authors.lastname: Fei
authors.forename: Bing
authors.initials: B
authors.lastname: Xia
authors.forename: Chang-Sheng
authors.initials: CS
authors.lastname: Deng
authors.forename: Xiao-Qing
authors.initials: XQ
authors.lastname: Xia
authors.forename: Min
authors.initials: M
authors.lastname: Xie
authors.forename: J Bart A
authors.initials: JB
authors.lastname: Crusius
authors.forename: A Salvador
authors.initials: AS
authors.lastname: Pena
mesh_terms: D000230:Adenocarcinoma / Q000453:epidemiology / Q000235:genetics*; D000328:Adult; D000368:Aged; D000483:Alleles; D002681:China / Q000453:epidemiology; D002908:Chronic Disease; D005260:Female; D005756:Gastritis / Q000453:epidemiology / Q000235:genetics*; D020022:Genetic Predisposition to Disease; D006801:Humans; D008297:Male; D008875:Middle Aged; D011110:Polymorphism, Genetic; D020033:Protein Isoforms / Q000235:genetics* / Q000378:metabolism; D017422:Sequence Analysis, DNA; D013274:Stomach Neoplasms / Q000453:epidemiology / Q000235:genetics*; D014409:Tumor Necrosis Factor-alpha / Q000235:genetics* / Q000378:metabolism
chemical_list: D020033:Protein Isoforms; D014409:Tumor Necrosis Factor-alpha