This research study is looking at how well combining radiotherapy and an investigational medication works for people with a specific type of lung cancer called oligometastatic lung adenocarcinoma. This type of cancer has spread to a few small areas (1-5 spots) and does not have certain known gene changes (negative driver genes).

Participants will receive radiotherapy, a type of treatment using high-energy rays, and then start the investigational medication given through an IV. This happens every 3 weeks until the cancer gets worse or side effects are too much. The study will last as long as the treatment is effective or until it's stopped for other reasons.

• Who can join? People 18 and older with lung adenocarcinoma and no certain gene changes.
• Time commitment: Treatment every 3 weeks; regular check-ups to monitor progress.
• Important: Cannot join if you have certain health conditions like severe heart issues, uncontrolled high blood pressure, or recent major surgery.

This study aims to understand the safety and effectiveness of this treatment combination. If you or a loved one has this type of lung cancer, consider discussing participation with your doctor.