title: Association between interleukin-1 gene polymorphisms and Helicobacter pylori infection in gastric carcinogenesis in a Chinese population.
abstract: OBJECTIVE
  Helicobacter pylori is a major cause of chronic gastritis and peptic ulcer disease and a definite carcinogen for gastric adenocarcinoma. However, the underlying pathogenic mechanisms are not fully understood. Interleukin-1 (IL-1) is a key cytokine involved in H. pylori-induced gastric inflammation. The present study aimed to determine polymorphisms of IL-1B and IL-1 receptor antagonist (IL-1RN) genes and their association with H. pylori infection and gastroduodenal diseases in Chinese patients.
  
  
  METHODS
  Three hundred and ninety-nine patients with gastroduodenal diseases (129 chronic gastritis, 127 duodenal ulcer and 143 non-cardiac gastric cancer) and 264 healthy controls were genotyped for IL-1B-511 and IL-1RN gene polymorphisms by the PCR-RFLP method. H. pylori infection status was determined by a validated serological test.
  
  
  RESULTS
  The frequency of IL-1B-511 T allele was significantly higher in H. pylori positive patients with non-cardiac gastric cancer than in both H. pylori negative patients with non-cardiac gastric cancer (60%vs 46%, P = 0.0342, OR = 1.666, 95% confidence interval [CI]: 1.045-2.656) and in healthy controls (60%vs 48%, P = 0.0071, OR = 1.665, 95%CI: 1.149-2.412). However, the polymorphism was not associated with chronic gastritis and duodenal ulcer. Multivariate logistic regression analyses identified that IL-1B-511 T/T carrier status was an independent risk factor for non-cardiac gastric cancer in the presence of H. pylori infection (adjusted OR = 3.01, 95%CI: 1.27-7.11, P = 0.01), and the frequency of IL-1B-511 T allele was an increased risk factor for developing gastric cancer (P = 0.03, adjusted OR = 2.29, 95%CI: 1.08-4.86). There was no association between IL-1RN gene polymorphisms and H. pylori infection and other gastroduodenal diseases.
  
  
  CONCLUSIONS
  IL-1B-511 T allele is associated with H. pylori infection in non-cardiac gastric cancer in a Chinese population. The IL-1B-511 gene polymorphism appears to play an important role in gastric carcinogenesis in Chinese patients with H. pylori infection.
authors.affiliation: Department of Internal Medicine and Geriatrics, Zhongnan Hospital, Wuhan University School of Medicine, Wuhan, China.
authors.forename: Chun
authors.initials: C
authors.lastname: Li
authors.forename: Harry Hua-Xiang
authors.initials: HH
authors.lastname: Xia
authors.forename: Wei
authors.initials: W
authors.lastname: Xie
authors.forename: Zhengguo
authors.initials: Z
authors.lastname: Hu
authors.forename: Mei
authors.initials: M
authors.lastname: Ye
authors.forename: Jin
authors.initials: J
authors.lastname: Li
authors.forename: Hong
authors.initials: H
authors.lastname: Cheng
authors.forename: Xiaolian
authors.initials: X
authors.lastname: Zhang
authors.forename: Bing
authors.initials: B
authors.lastname: Xia
mesh_terms: D002681:China; D002908:Chronic Disease; D004381:Duodenal Ulcer / Q000150:complications / Q000209:etiology; D005260:Female; D005756:Gastritis / Q000150:complications / Q000209:etiology; D016481:Helicobacter Infections / Q000150:complications* / Q000235:genetics*; D016480:Helicobacter pylori; D006801:Humans; D053590:Interleukin 1 Receptor Antagonist Protein / Q000235:genetics*; D053583:Interleukin-1beta / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D011110:Polymorphism, Genetic; D013274:Stomach Neoplasms / Q000209:etiology*
chemical_list: C507763:IL1RN protein, human; D053590:Interleukin 1 Receptor Antagonist Protein; D053583:Interleukin-1beta