This study looks at two different ways to treat a type of lung cancer called **Stage I Non-Small Cell Lung Cancer (NSCLC)**. One way is surgery, where doctors cut out the cancer, and the other is **Stereotactic Body Radiation Therapy (SBRT)**, which uses strong X-rays to target the cancer. People who join this study will have their health checked for three years to see how well the treatment works and how they feel about it.

**Key Points:**

• The study lasts for 3 years with health checks over this time.
• Participants must be at least 18 years old and healthy enough for either treatment.
• Involvement requires understanding and agreeing to the treatment plan and study terms.

To be part of the study, you must have Stage I NSCLC and be able to understand and sign a consent form. You should not have had other cancers that could affect the study, or previous treatments for lung cancer. The study excludes people with certain medical conditions, like serious heart problems or other cancers. This study helps doctors learn the best ways to treat lung cancer.