title: The effect of eradicating helicobacter pylori on the development of gastric cancer in patients with peptic ulcer disease.
abstract: OBJECTIVE
  Infection with Helicobacter pylori is a risk factor for the development of gastric cancer. However, it is not known whether eradication therapy can prevent the development of gastric cancer in persons in whom the cancer is not yet established. In the present study, we investigated whether the eradication of H. pylori in patients with peptic ulcer disease reduces the likelihood of their developing gastric cancer.
  
  
  METHODS
  Prospective posteradication evaluations were conducted in 1,342 consecutive patients (1,191 men and 151 women; mean age: 50 yr) with peptic ulcer diseases who had received H. pylori eradication therapy. After confirmation of eradication, endoscopy and a urea breath test were performed yearly.
  
  
  RESULTS
  A total of 1,120 patients completed more than 1-yr follow-up and were followed for up to 8.6 yr (a mean of 3.4 yr). Gastric cancer developed in 8 of 944 patients cured of infection and 4 of 176 who had persistent infection (p= 0.04; log-rank test). All the gastric cancer developed in patients with gastric ulcer, but none in patients with duodenal ulcer (p= 0.005; Fisher's exact test). In patients with gastric ulcer, persistent infection was identified as a significant factor for the risk of developing gastric cancer (hazard ratio: 3.35; 95% confidence interval: 1.00-11.22; p= 0.04; Cox's proportional-hazards model).
  
  
  CONCLUSIONS
  H. pylori eradication may reduce their risk of developing gastric cancer in patients with gastric ulcer. Large-scale studies in additional populations of this important international public-health issue are warranted.
authors.affiliation: Department of Internal Medicine, Nippon Kokan Fukuyama Hospital, Daimon-cho, Fukuyama, Japan.
authors.forename: Susumu
authors.initials: S
authors.lastname: Take
authors.forename: Motowo
authors.initials: M
authors.lastname: Mizuno
authors.forename: Kuniharu
authors.initials: K
authors.lastname: Ishiki
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Nagahara
authors.forename: Tomowo
authors.initials: T
authors.lastname: Yoshida
authors.forename: Kenji
authors.initials: K
authors.lastname: Yokota
authors.forename: Keiji
authors.initials: K
authors.lastname: Oguma
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Okada
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Shiratori
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000658:Amoxicillin / Q000627:therapeutic use; D000900:Anti-Bacterial Agents / Q000627:therapeutic use; D000897:Anti-Ulcer Agents / Q000627:therapeutic use; D001944:Breath Tests; D004381:Duodenal Ulcer / Q000188:drug therapy / Q000382:microbiology*; D005260:Female; D005500:Follow-Up Studies; D005773:Gastroscopy; D016481:Helicobacter Infections / Q000188:drug therapy*; D016480:Helicobacter pylori / Q000187:drug effects*; D006801:Humans; D008297:Male; D008875:Middle Aged; D016016:Proportional Hazards Models; D011446:Prospective Studies; D054328:Proton Pump Inhibitors; D012307:Risk Factors; D013274:Stomach Neoplasms / Q000517:prevention & control*; D013276:Stomach Ulcer / Q000188:drug therapy / Q000382:microbiology*; D014508:Urea / Q000032:analysis
chemical_list: D000900:Anti-Bacterial Agents; D000897:Anti-Ulcer Agents; D054328:Proton Pump Inhibitors; D000658:Amoxicillin; D014508:Urea