Varies. Osteosarcoma survival rates depends on many factors, with age being the most important. Up to 65% of children are cured with surgery and chemotherapy. We are now in some cases curing patients with limited metastatic disease or diseas ein other sites like the lungs. Extensive metastatic disease and age over 40 are typically two bad prognostic signs. This is one i would directly ask your physician.
Depends. With appropriate therapy the overall survival for localized disease (non-metastatic) is about 70% and for disease that has spread (metastatic) about 25-30%.