A sarcoma (from the Greek sarx meaning "flesh") is a cancer that arises from transformed cells in one of a number of tissues that develop from embryonic mesoderm. Thus, sarcomas include tumors of bone, cartilage, fat, muscle, vascular, and hematopoietic tissues. (This is in contrast to carcinomas, which originate from epithelial cells and thus give rise to more common malignancies, such as breast, colon, and lung cancer.)
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