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