title: Has the impact of Helicobacter pylori therapy on ulcer recurrence in the United States been overstated? A meta-analysis of rigorously designed trials.
abstract: OBJECTIVE
  The aim of this study was to assess the effect of H. pylori eradication on ulcer recurrence in North American duodenal ulcer patients by examining only treatment studies that met rigorous methodologic criteria.
  
  
  METHODS
  Data sources were computerized bibliographic searches from 1983, review of reference lists, communication with companies that manufacture medications used for H. pylori therapy in the U.S., and H. pylori investigators, review of open presentations to the Food and Drug Administration, and review of abstracts from annual scientific meetings. Criteria for study inclusion were double blind, randomized North American trials of H. pylori therapy for duodenal ulcer, scheduled endoscopic follow-up exams for > or = 6 months, and H. pylori cure documented > or = 4 wk after completion of therapy by at least two endoscopic biopsy tests. Seven relevant trials were identified. Data were abstracted independently and disagreement was resolved by consensus. We obtained missing data and identified erroneous assessments through contact with an author or sponsor of all studies.
  
  
  RESULTS
  The common odds ratio for ulcer recurrence was 0.20 (95% CI, 0.13-0.31) and 2.8 patients would need to be successfully treated to prevent one ulcer recurrence at 6 months. The pooled ulcer recurrence rate at 6 months in patients with H. pylori eradication was 20%.
  
  
  CONCLUSIONS
  Results of North American studies of highest methodological quality confirm that H. pylori eradication markedly decreases ulcer recurrence. Nevertheless, 20% of patients in these studies had ulcer recurrence within 6 months, despite successful cure of infection and no reported use of NSAIDs. Non-H. pylori, non-NSAID ulcers may be more common in the U.S. than previously believed.
authors.affiliation: Division of Gastrointestinal and Liver Diseases, U.S.C. School of Medicine, Los Angeles, California 90033, USA.
authors.forename: L
authors.initials: L
authors.lastname: Laine
authors.forename: R J
authors.initials: RJ
authors.lastname: Hopkins
authors.forename: L S
authors.initials: LS
authors.lastname: Girardi
mesh_terms: D004311:Double-Blind Method; D004381:Duodenal Ulcer / Q000188:drug therapy* / Q000382:microbiology; D016481:Helicobacter Infections / Q000188:drug therapy*; D016480:Helicobacter pylori; D006801:Humans; D016017:Odds Ratio; D016032:Randomized Controlled Trials as Topic / Q000592:standards; D012008:Recurrence