Inclusion Criteria:

1. Histologically or transbronchoscopic cytologically confirmed non-small cell lung
cancer

2. Stage IA with images within 28 days

3. No other intrathoracic lesions

4. Dose constraints of the organs at risk seem to be limited within range

5. Operable (Standard or Limited surgery) or Inoperable

6. Age>=20

7. No previous thoracic radiation

8. No previous chemotherapy

9. ECOG PS=0-2

10. Respiratory function (<=14 days) PaO2>=60 torr FEV1.0>=700 ml

11. Written informed consent

Exclusion Criteria:

1. No apparent radiation pneumonitis and fibrosis

2. No active tuberculosis without oral drugs

3. No double cancer

4. No pregnancy

5. No psychiatric disorder

6. No steroid administration