title: [Diagnostic value of stomach biopsy in comparison with surgical specimen in gastric B-cell lymphomas of the MALT type].
abstract: Diagnostic und therapeutic management of gastric lymphomas of the mucosa-associated lymphoid tissue type (MALT-type lymphomas) is often based exclusively on the evaluation of biopsy material. To evaluate the diagnostic value of gastric biopsies in gastric MALT-type lymphomas, biopsies--on average six per patient--and subsequent surgical specimens of 64 patients were compared at the Institute of Pathology, University of Würzburg. Tumor diagnosis and tumor gradind were assessed. Using biopsy specimens, primary gastric MALT-type lymphomas were correctly diagnosed by local pathologists in 69% of cases, but correctly graded as low-grade, high-grade or secondary high-grade lymphomas in only 41%. When immunohistochemistry and molecular biological techniques were applied in addition to conventional histology, diagnosis of gastric MALT-type lymphoma was achieved in biopsies in 95% of cases at the Institute of Pathology Würzburg, but correct grading in only 73%. In secondary high-grade MALT-type lymphomas, both components--the high-grade and the low-grade component--were identified in gastric biopsies in only 33% of cases. Diagnostic accuracy in gastric lymphomas based on biopsies is limited by biopsy artefacts, but improved by using immunohistochemistry and molecular biological techniques. Particularly in secondary high-grade MALT-type lymphomas the correct diagnosis is often missed when using biopsies, due to a low number of biopsy specimens.
authors.affiliation: Pathologisches Institut, Universität Würzburg.
authors.forename: P
authors.initials: P
authors.lastname: Strecker
authors.forename: M
authors.initials: M
authors.lastname: Eck
authors.forename: A
authors.initials: A
authors.lastname: Greiner
authors.forename: M
authors.initials: M
authors.lastname: Kolve
authors.forename: B
authors.initials: B
authors.lastname: Schmausser
authors.forename: A
authors.initials: A
authors.lastname: Marx
authors.forename: W
authors.initials: W
authors.lastname: Fischbach
authors.forename: C
authors.initials: C
authors.lastname: Fellbaum
authors.forename: H K
authors.initials: HK
authors.lastname: Müller-Hermelink
mesh_terms: D014408:Biomarkers, Tumor / Q000032:analysis; D001706:Biopsy; D003937:Diagnosis, Differential; D005260:Female; D005753:Gastric Mucosa / Q000473:pathology; D006801:Humans; D008198:Lymph Nodes / Q000473:pathology; D018442:Lymphoma, B-Cell, Marginal Zone / Q000473:pathology* / Q000601:surgery; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D013274:Stomach Neoplasms / Q000473:pathology* / Q000601:surgery
chemical_list: D014408:Biomarkers, Tumor
vernacular_title: Diagnostische Aussagekraft der Magenbiopsie im Vergleich zum Resektat bei primären gastralen B-Zell-Lymphomen vom MALT-Typ.