Segmentectomy for Ground Glass-dominant Invasive Lung Cancer (ECTOP-1012)

This study is comparing two surgical approaches for a specific type of early lung cancer — a ground glass-dominant invasive lung tumor 2-3 cm in size: a more limited removal called segmentectomy (removing only the affected segment of the lung) versus the standard lobectomy (removing an entire lobe). The aim is to see if the smaller surgery is just as effective while preserving more lung function. **You may be eligible if...** - You are between 18 and 80 years old - You have an early-stage lung adenocarcinoma that appears as a "ground glass" nodule 2-3 cm in size with a low solid component ratio (CTR 0-0.5) on CT scan - You have not had prior lung cancer surgery or received prior chemotherapy or radiation for this cancer - The tumor can be completely removed surgically **You may NOT be eligible if...** - Your tumor's solid-to-total size ratio or size falls outside the study parameters - You have received prior lung cancer surgery, chemotherapy, or radiation - The tumor cannot be fully removed - Your tumor is not confirmed as lung adenocarcinoma Talk to your doctor to see if this trial is right for you.