title: Trisomy 3 in gastric lymphomas of extranodal marginal zone B-cell (mucosa-associated lymphoid tissue) origin demonstrated by FISH in intact paraffin tissue sections.
abstract: Some reports have indicated that trisomy 3 represents a characteristic chromosomal abnormality found in lymphomas arising in mucosa-associated lymphoid tissues (MALT)/extranodal marginal zone B-cells (MZBC). Traditional cytogenetic analysis of metaphase preparations is cumbersome and not always possible, especially in those situations in which the diagnosis in not suspected before a biopsy. Our aim is to use a relatively simple method to evaluate trisomy 3 in paraffin-embedded, formalin-fixed tissue, using fluorescence in situ hybridization (FISH) on intact tissue sections. Formalin-fixed, paraffin-embedded archival tissues from 30 cases (27 lymphoma and 3 chronic gastritis cases) were hybridized with a chromosome 3 specific alpha-satellite probe (ONCOR, Gaithersburg, MD). Three of four cases of gastric MZBC/MALT lymphoma revealed trisomy 3. Ten cases of lymphoma of possible or probable MZBC origin were examined, and four revealed trisomy 3. Five of 13 non-MZBC lymphomas revealed trisomy 3. None of the chronic gastritis cases nor normal tonsil cases revealed trisomy 3. Our results, using a different methodological approach, confirm the findings of others that trisomy 3 is an abnormality found in a significant proportion of lymphomas of MZBC origin. Our approach also makes possible interphase cytogenetic analysis (by FISH) of routinely processed formalin-fixed, paraffin-embedded tissues, without the need to disaggregate cells. It thus may facilitate genetic analysis on specimens previously deemed unsuitable for such analysis, particularly when tissue quantity is limited.
authors.affiliation: University of Cincinnati Medical College, OH, USA.
authors.forename: R
authors.initials: R
authors.lastname: Blanco
authors.forename: M
authors.initials: M
authors.lastname: Lyda
authors.forename: B
authors.initials: B
authors.lastname: Davis
authors.forename: M
authors.initials: M
authors.lastname: Kraus
authors.forename: C
authors.initials: C
authors.lastname: Fenoglio-Preiser
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002893:Chromosomes, Human, Pair 3; D005260:Female; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D018442:Lymphoma, B-Cell, Marginal Zone / Q000235:genetics* / Q000473:pathology; D008297:Male; D008875:Middle Aged; D016612:Paraffin Embedding; D013274:Stomach Neoplasms / Q000235:genetics* / Q000473:pathology; D014314:Trisomy