title: Genetic instability in gastric epithelial neoplasias categorized by the revised vienna classification.
abstract: OBJECTIVE
  The aim of this study was to determine the structural chromosomal aberrations, such as loss of heterozygosity (LOH) and microsatellite instability (MSI), at multiple tumor suppressor gene loci in gastric epithelial neoplasia categorized by the revised Vienna classification.
  
  
  METHODS
  All tissue samples were excised by endoscopic mucosal resection. Sixty category 3 (low-grade adenoma) tissue samples and 51 category 4 samples (high-grade adenoma and intramucosal carcinoma with adenoma) were examined at the 7 sets of microsatellite loci linked to the tumor suppressor gene locus.
  
  
  RESULTS
  For category 3 and 4 tissue samples, there were no differences in the frequencies of LOH-positive chromosomes or the extent of chromosomal loss. The Helicobacter-pylori (H. pylori)-positive rate was significantly higher in MSI-positive category 4 samples than in category 3 samples (p=0.04). The frequency of MSI positivity was significantly higher in category 4 samples than in category 3 samples (p=0.003).
  
  
  CONCLUSIONS
  H. pylori infection is associated with genetic instability of the premalignant lesion. MSI occurs in the early stages of gastric carcinogenesis and its occurrence increases during malignant transformation. Detection of MSI in premalignant gastric lesions may be a surveillant of risk of malignant transformation.
authors.affiliation: Department of Internal Medicine, St. Vincent Hospital, The Catholic University of Korea, College of Medicine, Suwon, Korea.
authors.forename: Woo Chul
authors.initials: WC
authors.lastname: Chung
authors.forename: Sung Hoon
authors.initials: SH
authors.lastname: Jung
authors.forename: Kang Moon
authors.initials: KM
authors.lastname: Lee
authors.forename: Chang Nyol
authors.initials: CN
authors.lastname: Paik
authors.forename: Jae Wuk
authors.initials: JW
authors.lastname: Kwak
authors.forename: Ji Han
authors.initials: JH
authors.lastname: Jung
authors.forename: Jin Young
authors.initials: JY
authors.lastname: Yoo
authors.forename: Min Kyoung
authors.initials: MK
authors.lastname: Lee
authors.forename: In-Sik
authors.initials: IS
authors.lastname: Chung