The Varied And numerous reports on the efficacy of radiation therapy in bronchogenic carcinoma have prompted the author to record the results of accurate beam-directed radiotherapy administered in high dosage to a group of patients with proved inoperable bronchogenic carcinoma. A review of the literature revealed no two reports with comparable selection of cases, methods of treatment, or grouping of cases that would permit satisfactory comparative analysis. One of the most comprehensive statistical reviews is that of Overholt and Schmidt (6). In their series, 1932–1948, the survival period was calculated from the time of diagnosis to death from the disease. The average survival period of 148 patients not explored was 4.4 months. The average survival period of 102 patients in whom the tumor was found to be inoperable on exploration was 7.0 months, and of those with resection, but with gross extension or lymph node involvement, 10 months. In the entire series no patient who died of the disease lived longer ...