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Bone tumor
A bone tumor, (also spelled bone tumour), is a neoplastic growth of tissue in bone. Abnormal growths found in the bone can be either benign (noncancerous) or malignant (cancerous).
Average five-year survival in the United States after being diagnosed with bone and joint cancer is 67%.〔(【引用サイトリンク】url=http://seer.cancer.gov/statfacts/html/bones.html )〕
==Classification==
Bone tumors may be classified as "primary tumors", which originate in bone or from bone-derived cells and tissues, and "secondary tumors" which originate in other sites and spread (metastasize) to the skeleton. Carcinomas of the prostate, breasts, lungs, thyroid, and kidneys are the carcinomas that most commonly metastasize to bone. Secondary malignant bone tumors are estimated to be 50 to 100 times as common as primary bone cancers.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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