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A pilot experiment to compare regression of transplants of two different human tumors in athymic nude mice following single exposures to 60co radiation.

Human tumor transplants were grown in a thymus defective nude mouse mutant (nu/nu BALB/c/A/Bom). Procedures for local irradiation of the tumor with 60Co-radiation are described. An introductory test of the usefulness of these transplants in studies of radiation effects on human tumors is performed by investigation of the time course of regression of adenocarcinoma transplants in six mice following single exposures of 375, 750, 1180 and 1575 rd, respectively, and malignant melanoma transplants in two mice following single exposures to 1475 and 2420 rd, respectively. The higher radioresistance of the malignant melanomas relative to that of the ovarian tumor is expected on the basis of clinical experience and indicates that radiation effects on human tissue implants in nude mice mirror some of the fundamental features of the in situ situation.