This study is testing a treatment for **relapsed osteosarcoma**, a type of bone cancer that has returned and spread to the lungs. It combines a medicine called **Atezolizumab**, a type of immune therapy, with **Stereotactic Body Radiation Therapy (SBRT)**, which is a precise form of radiation, and surgery to remove lung tumors. The goal is to see if this combination is safe and if it helps patients better than other treatments.
- This study is for people whose cancer has come back only in the lungs and can be treated with surgery.
- Participants will receive both radiation therapy and surgery, and they need to be available for multiple visits.
- If eligible, participants must not have severe ongoing health issues and must agree to use birth control during and after the study.
Participants will need to sign a consent form. Women must have a negative pregnancy test, and everyone must agree to use birth control. The study aims to improve survival rates by using this new treatment method. If you're interested, talk to your doctor to see if this study might be a fit for you.
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