[Prospects for using the cryogenic factor in the radiation therapy of tumors].

Experimental studies with 640 mongrel male rats with transplants of Guerin carcinoma and DMBA-induced tumours were performed. Separate groups of animals were subjected to isolated effects of cryodestruction, radiation therapy with total doses of 60 or 30 Gy and combined cryoradiation treatment by different schedule. The study revealed that an enhanced efficiency of combined treatment is achieved essentially by a two-fold decrease in the total irradiation dose in combination with tumour focal cryodestruction.