Abstract
1. The incidence, ætiology, pathology, symptomatology and diagnosis of carcinoma of the bronchus are briefly described, and the extreme importance of early diagnosis emphasised. 2. Although pneumonectomy is the treatment of choice in suitable cases, it is pointed out that the number of operable cases is small, not more than about 10 per cent. 3. The contradictory opinions as to the value of radiotherapy are referred to. 4. The techniques of treatment by deep X-rays, which I have employed, are described, and the value of penicillin during the course of treatment stressed. 5. A series of 213 cases of carcinoma of the bronchus, seen in Mount Vernon Hospital during the years 1942–6, is analysed. 6. The results of radiotherapy are evaluated under the headings of possibility of cure, prolongation of life, and relief of symptoms.

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