Abstract
In this preclinical in vivo study, we measured antitumor response, local side effects and systemic toxicity of locally applied water-bath hyperthermia given alone or simultaneously with mitoxantrone (3 mg/kg b.w. i.v.; LD 10) on a human derived breast carcinoma (MX 1) or a human sarcoma (S 117) transplanted to female athymic (nude) mice. A single hyperthermia treatment at a tumor temperature up to 43°C for 1 hr caused in both tumor lines only minor tumor regressions and transient tumor growth delay. However, the antitumor effect of mitoxantrone was significantly enhanced by local hyperthermia at 42°C and particularly at 43°C. In both tumor lines complete tumor regressions were achieved only if mitoxantrone was combined with hyperthermia. Undesired side effects and drug toxicity were not enhanced by hyperthermia. According to in vitro data and the results of the present in vivo study mitoxantrone seems to be a good candidate for clinical trials in combination with locoregional hyperthermia.
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