title: Assessment of markers for the identification of microsatellite instability phenotype in gastric neoplasms.
abstract: We tested three mononucleotide, 45 dinucleotide, and five tetranucleotide repeats in 30 gastric adenomas and 30 gastric carcinomas for microsatellite instability (MSI) in order to evaluate which microsatellites might indicate the MSI status in gastric neoplasms. Along with the increase in tested markers, the proportion of low-frequency MSI (MSI-L) tumors increased. On immunohistochemistry, MSI-L gastric neoplasms did not show any alteration in hMLH1 or hMSH2 protein expression, while most of the high-frequency MSI (MSI-H) tumors did show alterations in the above mismatch repair proteins. The above findings suggested that MSI-L tumors cannot be distinguished from microsatellite stable tumors. Two mononucleotides, BAT25 and BAT26, were sufficient for the screening of MSI. An additional three dinucleotides, D17S786, D6S105 and D19S188, were also highly sensitive and specific in identifying MSI phenotype tumors.
authors.affiliation: Department of Pathology, Seoul National University College of Medicine, Seoul, South Korea.
authors.forename: H S
authors.initials: HS
authors.lastname: Kim
authors.forename: B L
authors.initials: BL
authors.lastname: Lee
authors.forename: D K
authors.initials: DK
authors.lastname: Woo
authors.forename: S I
authors.initials: SI
authors.lastname: Bae
authors.forename: W H
authors.initials: WH
authors.lastname: Kim
mesh_terms: D048868:Adaptor Proteins, Signal Transducing; D000236:Adenoma / Q000235:genetics / Q000378:metabolism; D002277:Carcinoma / Q000235:genetics / Q000378:metabolism; D002352:Carrier Proteins; D004268:DNA-Binding Proteins; D005753:Gastric Mucosa / Q000378:metabolism; D016158:Genes, p53 / Q000235:genetics; D006801:Humans; D007150:Immunohistochemistry; D018895:Microsatellite Repeats; D000070957:MutL Protein Homolog 1; D051718:MutS Homolog 2 Protein; D009363:Neoplasm Proteins / Q000096:biosynthesis; D009687:Nuclear Proteins; D009711:Nucleotides / Q000378:metabolism; D010641:Phenotype; D011518:Proto-Oncogene Proteins / Q000096:biosynthesis; D012680:Sensitivity and Specificity; D013274:Stomach Neoplasms / Q000235:genetics* / Q000378:metabolism; D019680:Trinucleotide Repeat Expansion
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D002352:Carrier Proteins; D004268:DNA-Binding Proteins; C501486:MLH1 protein, human; D009363:Neoplasm Proteins; D009687:Nuclear Proteins; D009711:Nucleotides; D011518:Proto-Oncogene Proteins; C497172:MSH2 protein, human; D000070957:MutL Protein Homolog 1; D051718:MutS Homolog 2 Protein