Terminology: Forget the arcana of germ layers in cancer nomenclature. Sarcomas are cancers that have, for their cell of origin, a connective tissue cell -- bone, cartilage, undifferented mesenchyme, fat, smooth / striated muscle, endothelium. By convention, cancers arising from blood elements, lymphocytes and mesothelium are given non-sarcoma names.
Answered 7/23/2014
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