title: Gastric non-Hodgkin lymphomas of mucosa-associated lymphoid tissue are not associated with more aggressive Helicobacter pylori strains as identified by CagA.
abstract: Primary gastric non-Hodgkin lymphoma of mucosa-associated lymphoid tissue (MALT-NHL) is strongly related to Helicobacter pylori (H pylori) infection. CagA positive H pylori strains appear to be more aggressive, as reflected by a greater degree of gastric inflammation and higher levels of Il-8 production. Using a polymerase chain reaction-based assay, cagA status was determined in H pylori strains of 12 patients with gastric MALT-NHL, 38 patients with peptic ulcer disease, and 39 patients with non-ulcer dyspepsia. CagA-positive H pylori strains were significantly more frequent in peptic ulcer disease than in non-ulcer dyspepsia (Fisher's exact test p <0.001). An increased frequency of CagA-positive strains was not identified in gastric MALT-NHL compared to non-ulcer dyspepsia patients (Fisher's exact test P <.3). Therefore, it can be concluded that infection with more aggressive strains is associated with the development of peptic ulcer disease, but plays a minor role, if any, in the development of gastric MALT-NHL.
authors.affiliation: Department of Pathology, the Netherlands Cancer Institute, Amsterdam.
authors.forename: D
authors.initials: D
authors.lastname: de Jong
authors.forename: R W
authors.initials: RW
authors.lastname: van der Hulst
authors.forename: G
authors.initials: G
authors.lastname: Pals
authors.forename: W C
authors.initials: WC
authors.lastname: van Dijk
authors.forename: A
authors.initials: A
authors.lastname: van der Ende
authors.forename: G N
authors.initials: GN
authors.lastname: Tytgat
authors.forename: B G
authors.initials: BG
authors.lastname: Taal
authors.forename: H
authors.initials: H
authors.lastname: Boot
mesh_terms: D000328:Adult; D000368:Aged; D000942:Antigens, Bacterial / Q000032:analysis / Q000235:genetics*; D001426:Bacterial Proteins / Q000032:analysis / Q000235:genetics*; D004415:Dyspepsia / Q000382:microbiology / Q000473:pathology; D005260:Female; D016481:Helicobacter Infections / Q000473:pathology*; D016480:Helicobacter pylori / Q000145:classification / Q000302:isolation & purification*; D006801:Humans; D018442:Lymphoma, B-Cell, Marginal Zone / Q000382:microbiology / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D010437:Peptic Ulcer / Q000382:microbiology / Q000473:pathology; D016133:Polymerase Chain Reaction / Q000379:methods; D013272:Stomach Diseases / Q000382:microbiology / Q000473:pathology*
chemical_list: D000942:Antigens, Bacterial; D001426:Bacterial Proteins; C080866:cagA protein, Helicobacter pylori