Gastrointestinal stromal tumor causes: Difference between revisions

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{{Gastrointestinal stromal tumor}}
{{Gastrointestinal stromal tumor}}


{{CMG}}
{{CMG}}{{AE}}{{PSD}}


==Causes==
Although some families with [[genetic disorder|hereditary]] GISTs have been described, most cases are sporadic.


In GIST cells, the ''c-kit'' gene is mutated approximately 85% to 90% of the time.  35% of the GIST cells that do not have a mutated ''c-kit'' ("wild-type") do have a mutation in another gene, PDGFR-α (platelet derived growth factor receptor alpha), which is a related tyrosine kinase. Mutations in the [[exon]]s 11, 9 and rarely 13 and 17 of the ''c-kit'' gene are known to occur in GIST. D816V [[point mutation]]s in ''c-kit'' exon 17 are responsible for resistance to targeted therapy drugs like [[imatinib mesylate]]. Mutations in ''c-kit'' and ''PDGFrA'' are mutually exclusive[http://www.liferaftgroup.org/gist_genetics.html][http://www.liferaftgroup.org/LondnPPT/Fletcher/Fletcher_files/frame.htm].
==Overview==


==Causes==
Most GISTs are sporadic. Less than 5% occur as part of [[genetic disorder|hereditary]] familial or idiopathic multitumor syndromes. These include, in descending order of frequency, [[neurofibromatosis]] Recklinghausen (NF-1), [[Carney's triad]] (gastric GIST, [[pulmonary]] [[chondroma]] and extra-[[adrenal]] [[paraganglioma]]), [[germline]] [[Gain-of-function mutation|gain-of-function]] [[mutation]]s in [[c-Kit]]/[[PDGFRA]], and the [[Carney's triad#Carney-Stratakis syndrome|Carney-Stratakis syndrome]].<ref name="Agaimy2010" /> The Carney-Stratakis syndrome is a [[Dyad (Greek philosophy)|dyad]] of hereditary GIST and paraganglioma, that is caused by germline mutations in the [[mitochondria]]l [[tumor suppressor gene]] pathway involving the [[succinate dehydrogenase]] (SDH) subunits [[SDHD]], [[Succinate dehydrogenase complex subunit C|SDHC]] and [[SDHB]].<ref name="Stratakis2009" /> Carney's triad does not feature SDH mutations.<ref name="Stratakis2009" />
==References==
==References==
{{reflist|2}}
{{reflist|2}}
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[[Category:Gastroenterology]]
[[Category:Gastroenterology]]
[[Category:Types of cancer]]
[[Category:Types of cancer]]
[[Category:Needs content]]
[[Category:Disease]]
[[Category:Disease]]



Revision as of 14:34, 31 August 2015

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]Associate Editor(s)-in-Chief: Parminder Dhingra, M.D. [2]


Overview

Causes

Most GISTs are sporadic. Less than 5% occur as part of hereditary familial or idiopathic multitumor syndromes. These include, in descending order of frequency, neurofibromatosis Recklinghausen (NF-1), Carney's triad (gastric GIST, pulmonary chondroma and extra-adrenal paraganglioma), germline gain-of-function mutations in c-Kit/PDGFRA, and the Carney-Stratakis syndrome.[1] The Carney-Stratakis syndrome is a dyad of hereditary GIST and paraganglioma, that is caused by germline mutations in the mitochondrial tumor suppressor gene pathway involving the succinate dehydrogenase (SDH) subunits SDHD, SDHC and SDHB.[2] Carney's triad does not feature SDH mutations.[2]

References

  1. 2.0 2.1


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