title: [Staging gastritis with the OLGA system: prevalence of advanced stages of gastric atrophy in Mexican patients].
abstract: BACKGROUND
  Gastric adenocarcinoma of intestinal type is preceded by inflammation, which produces mucosal atrophy and intestinal metaplasia, progressing eventually to dysplasia and invasive cancer. Recently an international group, the Operative Link on Gastritis Assessment (OLGA) proponed a staging system for gastric biopsies.
  
  
  OBJECTIVE
  To recognize the distribution of advanced stages of gastric mucosal atrophy in Mexican patients with dyspepsia according to the OLGA system.
  
  
  METHODS
  We apply the OLGA system for cancer risk (Stages 0 to IV) to 322 gastric biopsies from consecutive patients with dyspepsia. Using the Sydney protocol, we recorded the presence of atrophy, dysplasia and the relationship with ulcer disease. We report the stage of atrophy for each region and the Helicobacter pylori infection status.
  
  
  RESULTS
  We documented 72 (22.4%) cases with atrophy, 50 of them (69.4%) were metaplastic-type. Overall, nine biopsies (2.78%) were stage III (all of them with metaplastic-type atrophy) and there was not stage IV cases. We did not find high-grade dysplasia or intramucosal carcinoma. In 8 of subjects with stage III, we observed low-grade dysplasia. We documented gastric ulcer in 5 patients with stage II, 60% of them with associated low-grade dysplasia. Five patients with duodenal ulcer were found in stages 0 and I.
  
  
  CONCLUSIONS
  We found low prevalence of advanced stages of mucosal gastric atrophy among patients with dyspepsia. However we recognized 9 patients with stage III according to OLGA system worthy of follow-up because the high risk for developing gastric cancer.
authors.affiliation: Servicio de Anatomía Patológica, Unidad Médica de Alta Especialidad. Centro MédicoNacional La Raza, IMSS. México, D.F. ramenpablo@hotmail.com
authors.forename: P
authors.initials: P
authors.lastname: Ramírez-Mendoza
authors.forename: S A
authors.initials: SA
authors.lastname: Ruiz-Castillo
authors.forename: C
authors.initials: C
authors.lastname: Maroun-Marun
authors.forename: O
authors.initials: O
authors.lastname: Trujillo-Benavides
authors.forename: P
authors.initials: P
authors.lastname: Baltazar-Montúfar
authors.forename: R
authors.initials: R
authors.lastname: Méndez del Monte
authors.forename: U
authors.initials: U
authors.lastname: Angeles-Garay
mesh_terms: D000293:Adolescent; D000328:Adult; D001284:Atrophy / Q000453:epidemiology; D001706:Biopsy; D018450:Disease Progression; D005260:Female; D005753:Gastric Mucosa / Q000473:pathology; D005757:Gastritis, Atrophic / Q000453:epidemiology* / Q000473:pathology*; D006801:Humans; D008297:Male; D008800:Mexico / Q000453:epidemiology; D008875:Middle Aged; D015995:Prevalence; D055815:Young Adult