The overall incidence of tumors of the musculoskeletal system is lower than many types of cancers. This is particularly true for primary cancers of the bones and joints, although bones and joints are frequently a site of secondary, or metastasized, cancers. The occurrence of cancers of the bones and joints affects all ages and is one of the primary cancers in young people. Myeloma, cancer of the bone marrow, is a disease of the elderly, with nearly two-thirds of cases found in people ages 65 years and older. Soft tissue cancers affect all ages, but the occurrence increases with age. (Reference Table 9B.7 PDF CSV)