Patient: diagnosed Now undergoing chemotherapy, wanting limb-preserving surgery. What is the current 5-year survival rate and 10-year survival rate for osteosarcoma in China, and what is the longest survival time you have seen? Thank you! Doctor: The treatment of osteosarcoma in our department is in line with international standards, with a survival rate of about 80% at 5 years and 60-70% at 10 years. Several early stage patients have survived for more than 20 years and are still healthy.