http://www.liferaftgroup.org/faqs.html
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This page presents frequently asked questions about Gastrointestinal Stromal Tumor. GIST is a rare cancer of the GI track. It belongs to the general class of cancers called sarcomas. Sarcomas are a group of rare cancers that occur in connective tissues, bones, and muscle tissues. Sarcomas are derived from "mesenchymal cells", which are a general class of cells that includes fibroblasts, muscle cells, blood vessel lining cells (=endothelial cells).