Osteosarcoma is a type of cancer that produces immature bone. It is the most common type of cancer that arises in bones, and it is usually found at the end of long bones, often around the knee. Most people diagnosed with osteosarcoma are under the age of 25, and it is thought to occur more often in males than females.

Osteosarcomas range from low grade tumours that only require surgery to high grade tumors that require an aggressive treatment regimen. Patients with osteosarcoma are best treated at a cancer center where an expert sarcoma team and resources are available to provide specialized and responsive care.