title: The association of Helicobacter pylori with gastric cancer and preneoplastic gastric lesions in Chiapas, Mexico.
abstract: BACKGROUND
  Helicobacter pylori recently was identified as a risk factor for gastric cancer. Its association with preneoplastic conditions of the stomach, however, is undocumented.
  
  
  METHODS
  Gastric biopsy specimens from 245 symptomatic patients were examined for neoplastic and preneoplastic lesions and for gastric H. pylori infection. The sera of 183 subjects were tested by enzyme-linked immunosorbent assay (ELISA) for anti-H. pylori immunoglobulin G.
  
  
  RESULTS
  Histologic H. pylori infection, usually accompanied by acute and chronic gastritis, was found in 85.7% of patients. There was a strong association between H. pylori in the tissue and atrophy (relative risk, 15.0; 95% confidence interval, 4.2-56.6), intestinal metaplasia (relative risk, 5.7; 95% confidence interval, 1.9-16.8), and dysplasia or cancer (relative risk, 4.0; 95% confidence interval, 1.1-14.8). The ELISA was 93.2% sensitive and 57.1% specific for histologic infection with a positive predictive value of 96.1%. The overall seroprevalence rate was 86.1%, with no significant difference in rates between patients with cancer precursors and those with normal stomachs.
  
  
  CONCLUSIONS
  In this high-risk population, precursor lesions for adenocarcinoma were associated universally with H. pylori infection.
authors.affiliation: Instituto Nacional de Cancerología, Tlalpan, Mexico.
authors.forename: J
authors.initials: J
authors.lastname: Guarner
authors.forename: A
authors.initials: A
authors.lastname: Mohar
authors.forename: J
authors.initials: J
authors.lastname: Parsonnet
authors.forename: D
authors.initials: D
authors.lastname: Halperin
mesh_terms: D000328:Adult; D000907:Antibodies, Bacterial / Q000032:analysis; D016481:Helicobacter Infections / Q000150:complications* / Q000453:epidemiology; D016480:Helicobacter pylori / Q000276:immunology; D006801:Humans; D007074:Immunoglobulin G / Q000032:analysis; D008800:Mexico / Q000453:epidemiology; D008875:Middle Aged; D011230:Precancerous Conditions / Q000453:epidemiology / Q000209:etiology* / Q000473:pathology; D013274:Stomach Neoplasms / Q000453:epidemiology / Q000209:etiology* / Q000473:pathology
chemical_list: D000907:Antibodies, Bacterial; D007074:Immunoglobulin G