title: Helicobacter pylori strain and the pattern of gastritis among first-degree relatives of patients with gastric carcinoma.
abstract: BACKGROUND
  Relatives of gastric cancer patients have an increased risk of gastric cancer, possibly related to genetically-related strains of Helicobacter pylori or a common environment.
  
  
  METHODS
  The pattern of gastritis and H. pylori from gastric cancer patients and their first-degree relatives were compared using detailed DNA fingerprints and vacA, cagA, and iceA genotyping.
  
  
  RESULTS
  Sixteen index cases from Korea, the US, or Colombia and their 38 first-degree relatives (brothers, sisters, sons and daughters) were studied. No definite, or consistent, relationship between the pattern of gastritis and the relatedness of the H. pylori strain was observed (i.e. relatives could have an identical or a totally different pattern of gastritis regardless if they were infected with identical or highly similar organisms). For example, three elderly siblings of an index case with atrophic pangastritis had identical H. pylori isolates and environments in childhood and yet two had antral predominant nonatrophic gastritis, which is typically associated with duodenal ulcer instead of gastric cancer.
  
  
  CONCLUSIONS
  The results of this study are not consistent with the hypothesis that specific virulence factors or similar H. pylori strains correlate with a specific histologic pattern or outcome even among those sharing the same environment in childhood.
authors.affiliation: Veterans Affairs Medical Center and Baylor College of Medicine, Houston, Texas 77030, USA.
authors.forename: Li
authors.initials: L
authors.lastname: Li
authors.forename: Robert M
authors.initials: RM
authors.lastname: Genta
authors.forename: Mae F
authors.initials: MF
authors.lastname: Go
authors.forename: Oscar
authors.initials: O
authors.lastname: Gutierrez
authors.forename: Jong G
authors.initials: JG
authors.lastname: Kim
authors.forename: David Y
authors.initials: DY
authors.lastname: Graham
mesh_terms: D000328:Adult; D000368:Aged; D000942:Antigens, Bacterial; D001425:Bacterial Outer Membrane Proteins / Q000235:genetics / Q000378:metabolism; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism; D016172:DNA Fingerprinting; D004269:DNA, Bacterial / Q000032:analysis; D005190:Family; D005756:Gastritis / Q000382:microbiology / Q000473:pathology*; D016481:Helicobacter Infections / Q000382:microbiology / Q000473:pathology; D016480:Helicobacter pylori / Q000145:classification* / Q000235:genetics* / Q000302:isolation & purification; D006801:Humans; D008297:Male; D008875:Middle Aged; D016133:Polymerase Chain Reaction; D012307:Risk Factors; D013274:Stomach Neoplasms / Q000382:microbiology*
chemical_list: D000942:Antigens, Bacterial; D001425:Bacterial Outer Membrane Proteins; D001426:Bacterial Proteins; D004269:DNA, Bacterial; C074689:VacA protein, Helicobacter pylori; C080866:cagA protein, Helicobacter pylori; C063113:ice nucleation protein