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| {{Gastrointestinal stromal tumor}} | | {{Gastrointestinal stromal tumor}] |
| {{CMG}}
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| ==Biopsy==
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| * A [[biopsy]] sample will be investigated under the [[light microscopy|microscope]]. The [[histopathology|histopathologist]] identifies the characteristics of GISTs (spindle cells in 70-80%, epitheloid aspect in 20-30%). Smaller tumors can usually be found to the muscularis propria layer of the intestinal wall. Large ones grow, mainly outward, from the bowel wall until the point where they outstrip their blood supply and necrose (die) on the inside, forming a cavity that may eventually come to communicate with the bowel lumen.
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| * When GIST is suspected—as opposed to other causes for similar tumors—the histopathologist can use [[immunohistochemistry]] (specific [[antibody|antibodies]] that stain the molecule [[CD117]] (also known as ''c-kit'') —see below). 95% of all GISTs are CD117-positive (other possible markers include CD34, desmin, vimentin and others). Other cells that show CD117 positivity are [[mast cell]]s.
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| * Some tumors of the stomach and small bowel referred to as [[leiomyosarcoma]]s (malignant tumor of [[smooth muscle]]) would most likely be reclassified as GISTs today on the basis of immunohistochemical staining.
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| ==References==
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| {{reflist|2}} | | {{reflist|2}} |
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| [[Category:Types of cancer]] | | [[Category:Types of cancer]] |
| [[Category:Disease]] | | [[Category:Disease]] |
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| {{WikiDoc Help Menu}} | | {{WikiDoc Help Menu}} |
| {{WikiDoc Sources}} | | {{WikiDoc Sources}} |
Revision as of 17:09, 4 September 2015
{{Gastrointestinal stromal tumor}]
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