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*Abbreviated ''MSI cancers''. | *Abbreviated ''MSI cancers''. | ||
===General=== | ===General=== | ||
*May be seen in [[Lynch syndrome]]. | |||
Features:<ref name=pmid20420947>{{cite journal |author=Boland CR, Goel A |title=Microsatellite instability in colorectal cancer |journal=Gastroenterology |volume=138 |issue=6 |pages=2073–2087.e3 |year=2010 |month=June |pmid=20420947 |doi=10.1053/j.gastro.2009.12.064 |url=}}</ref> | Features:<ref name=pmid20420947>{{cite journal |author=Boland CR, Goel A |title=Microsatellite instability in colorectal cancer |journal=Gastroenterology |volume=138 |issue=6 |pages=2073–2087.e3 |year=2010 |month=June |pmid=20420947 |doi=10.1053/j.gastro.2009.12.064 |url=}}</ref> | ||
*Prognosis: slightly better than other [[CRC]] without MSI. | *Prognosis: slightly better than other [[CRC]] without MSI. | ||
*Treatment implication: different response to chemotherapy. | *Treatment implication: different response to chemotherapy. | ||
====MSI classification==== | ====MSI classification==== | ||
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**[[Signet ring cell carcinoma|Signet ring]]. | **[[Signet ring cell carcinoma|Signet ring]]. | ||
**Medullary.<ref name=pmid18283560>{{cite journal |author=Truta B, Chen YY, Blanco AM, ''et al.'' |title=Tumor histology helps to identify Lynch syndrome among colorectal cancer patients |journal=Fam. Cancer |volume=7 |issue=3 |pages=267–74 |year=2008 |pmid=18283560 |doi=10.1007/s10689-008-9186-8 |url=}}</ref> | **Medullary.<ref name=pmid18283560>{{cite journal |author=Truta B, Chen YY, Blanco AM, ''et al.'' |title=Tumor histology helps to identify Lynch syndrome among colorectal cancer patients |journal=Fam. Cancer |volume=7 |issue=3 |pages=267–74 |year=2008 |pmid=18283560 |doi=10.1007/s10689-008-9186-8 |url=}}</ref> | ||
===Molecular=== | |||
Commonly associated abnormalities in the genes: | |||
#MLH1. | |||
#PMS2. | |||
#MSH2. | |||
#MSH6. | |||
Less common abnormalities: | |||
#PMS1. | |||
#MLH3. | |||
#MSH3. | |||
===IHC=== | ===IHC=== |
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