ABSTRACT
Hyperthermia can depress the invasion and metastasis of cancer by changing the expressions of the vascular endothelial growth factors, matrix metalloproteinase, fibrinolysin, and adhesion factors. The biological characteristics of the cancer tissue are the basis of cancer hyperthermia. Cancer hyperthermia adopts mainly electric field and magnetic field heat effects. High-frequency magnetic field aims mainly to heat the muscles or other tissues with small resistance, without fat being overheated. Microwave heating on the tissues relies mainly on molecular friction and secondary on tissue electrolyte effect; it has selectable heating effect on water and water-containing substances that can absorb microwave energy. Under the radio-frequency electromagnetic waves, both normal and cancer tissues can absorb the energy of the electromagnetic waves. Magnetic induction heating aims to cause tissue heating through eddies present in the tissue, which are formed by alternating magnetic field produced by the induction coils.
