Malignant bone tumors.
D000671:Amputation, Surgical; D001859:Bone Neoplasms / Q000628:therapy*; D003131:Combined Modality Therapy; D006801:Humans; D009362:Neoplasm Metastasis; D012516:Osteosarcoma / Q000628:therapy*; D012512:Sarcoma, Ewing / Q000628:therapy*