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Sarcoma

Tumors that originate in the bone itself are known as primary bone cancer. The most common type of primary bone cancer is osteosarcoma, where tumors typically develop in bones of the arms, legs, or pelvis. In most cases of bone cancer, however, tumors originate not in the bone itself but in other parts of the body and subsequently spread to the bone. These cases of bone cancer are known as metastatic cancer (or secondary bone cancer) and occur in patients with advanced cancers, for example, breast cancer, prostate cancer, and lung cancer. In soft tissue sarcoma, cancer cells form in the soft tissues of the body, such as fat, muscles, tendons, blood and lymph vessels, nerves, deep skin tissues, and synovial tissues (i.e., tissues around joints). Soft tissue sarcomas can be found in any part of the body. Bone sarcomas are more common among children, whereas soft tissue sarcomas are more common in adults.