many experimental studies have shown that distant metastases shrink or disappear after local heat therapy for tumors. Tang Zhengxue et al. used electric heating needle to heat transplanted liver cancer in mice with a central temperature of 56 `C and a periphery below 45℃ for 10 minutes. The metastasis rate was 41

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2%-50% in the control group and 0%-10% in the heat therapy group. Another test: heating a mouse fibrosarcoma at 44