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It has been gradually accepted that Far-infrared ray (FIR) with wavelengths ranging from 4 to 20 μm suppressed the growth of some cancer cells, since cancer cells and tumors are thermo-seusitive.As we developed a tissue culture incubator that can continuously irradiate cells with FIR of wavelengths between 4 and 20μm with a peak of 7 to 12μm,it was clarified that FIR energy radiation induced arrest of cell cycle and inhibition effect of metastasis onA431 (vulva),HSC3 (tongue) and Sa3 (gingiva) cells in our laboratory.