Radiation Therapy for Cancer - Topic Overview

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What is radiation therapy?
Radiation therapy uses high doses of radiation to destroy cancer cells (tumors). Radiation damages the genetic material of cells in the area being treated, leaving the cells unable to continue to grow. Although radiation damages normal cells as well as cancer cells, the normal cells usually can repair themselves and function, while the cancer cells cannot.

Radiation therapy is used for many different types of cancers, such as bladder cancer, endometrial cancer, and prostate cancer.