Analysis of clinical results obtained in carcinoma of the body of the uterus has revealed two factors of fundamental importance in the treatment of operable cases. The first is that hysterectomy alone is inadequate treatment for certain types of clinically operable patients. The second point is that average results can be improved by combining radiation with surgery. Several authors have demonstrated a close relationship between microscopic appearance of tumor and end results. Collected statistics for hysterectomy alone given in an earlier publication show a greater percentage of five year cures among the well differentiated lesions than in the more anaplastic varieties.1More recent data presented by Scheffey and Thudium,2Ward and Sackett,3Healy and Brown4and others illustrate the importance of combining radiation with surgery in the attempt to improve clinical results, particularly among lesions of histologic types known to have a less favorable prognosis. For