title: Numerical chromosomal abnormality in gastric MALT lymphoma and diffuse large B-cell lymphoma.
abstract: BACKGROUND
  We investigated numerical chromosomal abnormalities, using the fluorescence in situ hybridization (FISH) method, in gastric mucosa-associated lymphoid tissue (MALT) lymphoma and diffuse large B-cell lymphoma (DLBL). We also compared the histopathological findings, including the presence or absence of Helicobacter pylori infection, with the analytical results.
  
  
  METHODS
  Sixteen patients who underwent operation for malignant gastric lymphoma in our department were divided into three groups: patients with low-grade gastric MALT lymphoma (l-MALT; n = 5), those with high-grade gastric MALT lymphoma (h-MALT; n = 8), and those with DLBL (n = 3). Numerical abnormalities of chromosomes 8, 9, 12, and 17 were investigated by the FISH method, and the presence or absence of H. pylori infection was microscopically examined.
  
  
  RESULTS
  Numerical abnormality was observed in chromosome 12 in 11 patients (68.8%), in chromosome 8 in 10 (62.5%), and in chromosome 17 in 5 (31.3%), showing a high frequency. H. pylori infection was detected in 80% and 50% of patients with l-MALT and h-MALT, respectively, but no H. pylori infection was observed in patients with DLBL.
  
  
  CONCLUSIONS
  A new biological characteristic of gastric MALT lymphoma was obtained, i.e., a high frequency of numerical abnormalities of chromosomes 12, 8, and 17. There was no correlation between the numerical chromosomal abnormalities and the clinicopathological findings.
authors.affiliation: Second Department of Surgery, Juntendo University, School of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113-8421, Japan.
authors.forename: Ikuo
authors.initials: I
authors.lastname: Watanobe
authors.forename: Shigeru
authors.initials: S
authors.lastname: Takamori
authors.forename: Kuniaki
authors.initials: K
authors.lastname: Kojima
authors.forename: Masaki
authors.initials: M
authors.lastname: Fukasawa
authors.forename: Tomoe
authors.initials: T
authors.lastname: Beppu
authors.forename: Shunji
authors.initials: S
authors.lastname: Futagawa
authors.forename: Shu
authors.initials: S
authors.lastname: Hirai
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002869:Chromosome Aberrations; D002881:Chromosomes, Human, Pair 12 / Q000235:genetics; D002886:Chromosomes, Human, Pair 17 / Q000235:genetics; D002898:Chromosomes, Human, Pair 8 / Q000235:genetics; D002899:Chromosomes, Human, Pair 9 / Q000235:genetics; D005260:Female; D016481:Helicobacter Infections / Q000235:genetics / Q000382:microbiology / Q000473:pathology; D016480:Helicobacter pylori / Q000302:isolation & purification; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D016393:Lymphoma, B-Cell / Q000235:genetics* / Q000382:microbiology / Q000473:pathology*; D018442:Lymphoma, B-Cell, Marginal Zone / Q000235:genetics* / Q000382:microbiology / Q000473:pathology*; D016403:Lymphoma, Large B-Cell, Diffuse / Q000235:genetics* / Q000382:microbiology / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D013274:Stomach Neoplasms / Q000235:genetics* / Q000382:microbiology / Q000473:pathology*