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Osteosarcoma is the most common cancerous (malignant) bone tumor in youth. The average age at diagnosis is 15. Boys and girls have a similar incidence of this tumor until late adolescence, at which time boys are more commonly affected.
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All cancers are caused when a mutation occurs in a gene that is involved in the control of cell division. This mutation can occur during normal DNA reproduction and be inherited by future generations, or it can be caused by a virus, radiation, or ...
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