• Endometrial carcinoma in six cases was treated by irradiation with x-rays and/or radium and later hysterectomy. In three of the cases the radiation was found not to have eradicated all the tumor cells. Since the delay between diagnosis and hysterectomy ranged from 9 to 17 weeks, the surviving tumor cells had ample time to multiply and metastasize before the uterus was actually removed.