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Bone cancer is a malignant growth that can be found in any part of the bone, in any bone of the body. The cancer may originate in the bone itself (primary bone cancer) or - more commonly - it may be a result of a cancer that has spread (metastasized) from elsewhere in the body (secondary bone cancer). Most bone cancers are called sarcomas, cancers that develop predominantly from bone, cartilage, muscle, fibrous tissue, fatty tissue, or nerve tissue. Bone cancer originating in the bone itself is known as primary bone cancer, and may be malignant (cancerous) or benign. As bone tumors grow, they compress, absorb or replace healthy bone tissue with abnormal tissue, causing a number of symptoms, including bone pain, swelling, and bone weakness. Treatments for bone cancer are increasingly successful; even for the more aggressive cancers, survival rates are improving considerably.
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