title: Tissue staining for Helicobacter pylori in intestinal metaplasia: correlation with its extension and histochemical subtypes.
abstract: The role played by Helicobacter pylori (Hp) infection in the occurrence of non-cardial gastric adenocarcinoma is suggestive but still debated. This study aimed to evaluate: a) the prevalence of Helicobacter-like organisms in antral bioptic specimens of 291 patients with chronic gastritis with antral atrophy and different subtypes of intestinal metaplasia (IM); b) the presence of a possible different positive tissue staining for the bacteria in the complete and incomplete intestinal metaplasia. Of the 291 patients, 222 cases (76.3%) showed type I IM, 28 cases (9.6%) type II IM and 41 cases (14.1%) type III IM. Helicobacter-like organisms were found in 42.9% of cases and positive tissue staining rate appeared to be inversely related to the extension of IM (58.7% in IM extended in less than 30% of specimens, 30.2% in IM extended between 30% and 60%, 2.7% in IM exceeding 60% of the biopsed area). The inverse correlation between lower positive tissue staining for Helicobacter-like organisms and greater extension of IM was statistically significant (p < 0.001). Incomplete metaplasia appeared to be unrelated to age and associated with a lower positive tissue staining for Helicobacter-like organisms; among patients with type I metaplasia, 118/222 showed Hp-positive bioptic specimens, vs 7/69 of types II and III (p < 0.001).(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Istituto di Medicina Interna, Università degli Studi di Milano, Italy.
authors.forename: P
authors.initials: P
authors.lastname: Testoni
authors.forename: E
authors.initials: E
authors.lastname: Colombo
authors.forename: R
authors.initials: R
authors.lastname: Scelsi
authors.forename: L
authors.initials: L
authors.lastname: Cattani
authors.forename: F
authors.initials: F
authors.lastname: Bagnolo
authors.forename: F
authors.initials: F
authors.lastname: Lella
authors.forename: M
authors.initials: M
authors.lastname: Buizza
authors.forename: O
authors.initials: O
authors.lastname: Luinetti
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001706:Biopsy; D002908:Chronic Disease; D016099:Endoscopy, Gastrointestinal; D005260:Female; D005757:Gastritis, Atrophic / Q000382:microbiology* / Q000473:pathology; D016481:Helicobacter Infections / Q000382:microbiology* / Q000473:pathology; D016480:Helicobacter pylori / Q000302:isolation & purification*; D006801:Humans; D007422:Intestines / Q000382:microbiology* / Q000473:pathology; D008297:Male; D008679:Metaplasia / Q000382:microbiology / Q000473:pathology; D008875:Middle Aged; D013194:Staining and Labeling