Free radicals play an important role in the genesis of cancer. By removing the metallic anions from the blood stream, EDTA helps the cells to remain healthy and helps the damaged cells to heal. Research has shown a decrease in the incidence of death by cancer after EDTA treatment. We don't know the mechanism of action. In some forms of cancer, the use of EDTA was found to strip the tumor cells of their protective coat, allowing other mechanisms (such as protein digesting enzymes) to destroy the tumors.