[Tumor hyperthermia using high frequency for increase of oncolysis by clostridium butyricum (M 55)]

In solid experimental tumors hypoxic cells preferably are inactivated by means of a short-termed radio-frequency treatment with eddy-current fields. Hence follows an increase of the necro-biotic areas. The presence of anoxic-necrobiotic areas is indispensable for the termination of certain anaerobic spores such as Clostridium butyricum s. oncolyticum (M 55). Local tumor hyperthermy is tested as a technique in altogether 861 mice bearing neck tumors, in order to enhance the germination of oncolytic Clostridia in tumors differing by their mode of formation and rate of growth. In all the three test systems used (Ehrlich solid carcinoma, Harding-Pasey-melanoma, fibrosarcoma induced by methylcholanthrene), the oncolysis being brought about by Clostridia can be intensified significantly by means of a short-termed warming of the tumor up to temperatures of 42 to 44 degress C using radio-frequency.