Sarcoma vs. Carcinoma, what’s the difference?
Sarcomas happen when cells from the musculoskeletal system (muscles, tendons, ligaments, bones and joints and associated tissues) become malignant. These cancers can also arise from mesenchymal ( a kind of connective tissue) tissue like bone muscle and fat. Sarcomas usually affect younger people and adults.
Most cancers (like around 90% ) are carcinomas. Carcinomas happen when epithelial cells (cells that line the cavities of the body and may form glands) become malignant. Older people tend to get these cancers.
Some info from: http://www.georgetownuniversityhospital.org/body_dept.cfm?id=1155