Abstract
Canine appendicular osteosarcoma is a highly malignant primary bone cancer that closely resembles the same disease in humans. Although amputation alone usually controls local disease, metastatic cancer is common and is the cause of death or euthanasia in 90% of dogs by 1 year. Cisplatin (+/- doxorubicin) chemotherapy appears to improve survival time in dogs; however, metastatic cancer remains a problem. Pulmonary metastasectomy may prolong survival in carefully selected dogs. Limb-sparing, although involved and potentially fraught with complications, can result in local disease control and a functional, pain-free limb in selected dogs without adversely affecting their survival. Studies are ongoing to improve local disease control with limb-sparing and improve disease-free survival in dogs with appendicular osteosarcoma. In conclusion, dogs with osteosarcoma were previously thought to have a hopeless prognosis, but the outlook is beginning to appear more optimistic. Limb-sparing in dogs is still evolving; however, it is possible in selected cases to optimize survival and preserve limb function.
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