Using focused radiofrequency or microwave energy, the tumor is heated to approximately 108°F. Heat can kill cancer cells at levels that are safe for normal cells, and can be used to attack cancer in four major ways.
First, heat kills or weakens the cells of the tumor. Second, heat increases blood flow through the weakened tumor, which can allow therapies to permeate the tumor, not just attack it from the outside. Third, increased blood flow raises oxygen levels in tumors so that the cancer can be more effectively treated by radiation therapy. Fourth, when the body senses fever it stimulates the natural immune system, attacking the cancerous cells. For these reasons, hyperthermia is usually used in combination with radiation therapy.
The results inspire hope. When coupled with existing treatments, studies show that, for some tumors, hyperthermia therapy may double the success rate when compared to using radiation therapy alone.*
