131 patients of non-small cell lung cancer treated with irradiation at Yonsei Cancer Center from Jan. 1971 to Dec. 1980 were Retrospectively analyzed. Overall 5-ear survival rate was 7% in 117 cases, treated with radiotherapy alone and 33% in 14 Cases, Treated with surgery & postoperative radiotherapy. Their median survival was 9.6 months in the former, while 11.1 months in the latter. The patients treated with radical aim achieved 10% in 5 YSR and with palliative aim, 0%. Also, survival according to Histological classification and staging was obtained. Treatment failure was mostly distant failure (40 cases/49 cases), and within 6 months (34 cases/49 cases).