Selective Lymph Node Dissection for cT1N0M0 Invasive NSCLC With CTR>0.5 Located in the Apical Segment (ECTOP-1018)

Inclusion Criteria: 1. Patients who sign the informed consent form and are willing to complete the study according to the plan; 2. Aged from 18 to 80 years old; 3. ECOG equals 0 or 1; 4. Not receiving lung cancer surgery before; 5. Resectable peripheral cT1N0M0 tumors with CTR\>0.5 located in the apical segment; 6. Non-lepidic predominant invasive NSCLC dignosed by frozen section; 7. Not receiving chemotherapy or radiotherapy before. Exclusion Criteria: 1. Not cT1N0M0; 2. Nodules not located in the apical segment or CTR≤0.5; 3. Pre-invasive lung adenocarcinoma, lepidic predominant adenocarcinoma, or not lung adenocarcinoma diagnosed cytologically or pathologically; 4. Receiving lung cancer surgery before; 5. Receiving radiotherapy or chemotherapy.