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Microsatellite instability (MSI) is regarded as reflecting defective DNA mismatch repair (MMR). MMR defects lead to an increase in point mutations, as well as repeat instability, on the genome. However, despite the highly unstable microsatellites, base substitutions in representative oncogenes or tumor suppressors are extremely infrequent in MSI-positive tumors. Recently, the heterogeneity in MSI-positive...
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