Bone cancer
     Bone tumor is an inexact term, which can be used for both benign and malignant abnormal growths found in bone, but is most commonly used for primary tumors of bone, such as osteosarcoma (or osteoma). It is less exactly applied to secondary, or metastatic tumors found in bone.
Definition of bone cancer: Primary bone cancer is cancer that forms in cells of the bone. Some types of primary bone cancer are osteosarcoma, Ewing's sarcoma, malignant fibrous histiocytoma, and chondrosarcoma. Secondary bone cancer is cancer that spreads to the bone from another part of the body (such as the prostate, breast, or lung).

Estimated new cases and deaths from cancer of the bones and joints in the United States in 2007: