BACKGROUND/AIMS: 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.
BACKGROUND/AIMS: 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. pyloriinfection 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: Kylie L Gorringe; Suet-Feung Chin; Paul Pharoah; Joanne M Staines; Carla Oliveira; Paul A W Edwards; Carlos Caldas Journal: Carcinogenesis Date: 2005-01-27 Impact factor: 4.944
Authors: Jane Bayani; Shamini Selvarajah; Georges Maire; Bisera Vukovic; Khaldoun Al-Romaih; Maria Zielenska; Jeremy A Squire Journal: Semin Cancer Biol Date: 2006-10-26 Impact factor: 15.707
Authors: R J Schlemper; M Itabashi; Y Kato; K J Lewin; R H Riddell; T Shimoda; P Sipponen; M Stolte; H Watanabe Journal: Cancer Date: 1998-01-01 Impact factor: 6.860
Authors: Soo Young Park; Seong Woo Jeon; Min Kyu Jung; Chang Min Cho; Won Young Tak; Young Oh Kweon; Sung Kook Kim; Yong Hwan Choi Journal: Eur J Gastroenterol Hepatol Date: 2008-10 Impact factor: 2.566