Radiation therapy is the use of high-energy radiation from X ray, cobalt, radium, and other sources in order to destroy the malignant cells.

Radiation therapy is really a burning process that destroys all the cells it touches. However, it can be focused on the exact area of the tumor. Nevertheless, one authority says that “radiation therapy has been strongly implicated in causing later cancers.” This presents a trade-off situation in which the patient must decide.