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- W2592982749 abstract "Microsatellite-unstable colorectal cancers (CRC) that are due to deficient DNA mismatch repair (dMMR) represent approximately 15% of all CRCs in the United States. These microsatellite-unstable CRCs represent a heterogenous group of diseases with distinct oncogenesis pathways. There are overlapping clinicopathologic features between some of these groups, but many important differences are present. Therefore, determination of the etiology for the dMMR is vital for proper patient management and follow-up.Epigenetic inactivation of MLH1 MMR gene (sporadic microsatellite-unstable CRC) and germline mutation in an MMR gene (Lynch syndrome, LS) are the two most common mechanisms in the pathogenesis of microsatellite instability in CRC. However, in a subset of dMMR CRC cases that are identified by screening tests, no known LS-associated genetic alterations are appreciated by current genetic analysis. When the etiology for dMMR is unclear, it leads to patient anxiety and creates challenges for clinical management.It is critical to distinguish LS patients from other patients with tumors due to dMMR, so that the proper screening protocol can be employed for the patients and their families, with the goal to save lives while avoiding unnecessary anxiety and costs. This review summarizes the major pathogenesis pathways of dMMR CRCs, their clinicopathologic features, and practical screening suggestions. In addition, we include frequently asked questions for MMR immunohistochemistry interpretation." @default.
- W2592982749 created "2017-03-16" @default.
- W2592982749 creator A5017541508 @default.
- W2592982749 creator A5049172627 @default.
- W2592982749 creator A5061124226 @default.
- W2592982749 date "2017-03-04" @default.
- W2592982749 modified "2023-10-14" @default.
- W2592982749 title "Molecular genetics of microsatellite-unstable colorectal cancer for pathologists" @default.
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- W2592982749 doi "https://doi.org/10.1186/s13000-017-0613-8" @default.
- W2592982749 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5336657" @default.
- W2592982749 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/28259170" @default.
- W2592982749 hasPublicationYear "2017" @default.
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