Adjuvant CCRT vs CT in Minimal N2 NSCLC

Inclusion Criteria: 1. Histologically confirmed diagnosis of stage IIIA(N2) NSCLC that was completely resected by lobectomy, bilobectomy, pneumonectomy, or sleeve lobectomy through any incision (thoracoscopic or video-assisted thorascopic surgery approaches were acceptable) 2. "Pathologic N2" disease (involvement of N2 nodes can only be determined at the time of surgical exploration or postoperative pathologic analysis) 3. Age ≥18years 4. No known residual disease (negative resection margin and no extracapsular invasion of lymph node metastasis) 5. ECOG performance status of 0 to 1 6. No previous chemotherapy or RT 7. Adequate organ function as evidenced by the following; Absolute neutrophil count \> 1.5 x 109/L; platelets \> 100 x 109/L; total bilirubin ≤1.5 UNL; AST and/or ALT \< 5 UNL; creatinine clearance ≥ 50mL/min 8. Written informed consent form Exclusion Criteria: 1. Patients with preoperative mediastinoscopic N2 positive disease 2. Uncontrolled systemic illness such as DM, CHF, unstable angina, hypertension or arrhythmia 3. Patients with post-obstructive pneumonia or uncontrolled serious infection 4. Pregnant or nursing women ( Women of reproductive potential have to agree to use an effective contraceptive method) 5. Prior history of malignancy within 5 years from study entry except for a adequately treated basal cell or squamous cell skin cancer or in situ cervical cancer, well-treated thyroid cancer