Radiation Therapy: Purpose

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The purpose of radiation therapy is to kill or damage cancer cells. Radiation therapy is a common form of cancer therapy. It is used in more than half of all cancer cases. Radiation therapy can be used:

• alone to kill cancer
• before surgery to shrink a tumor and make it easier to remove
• during surgery to kill cancer cells that may remain in surrounding tissue after the surgery (called intraoperative radiation)
• after surgery to kill cancer cells remaining in the body
• to shrink an inoperable tumor in order to and reduce pain and improve quality of life
• in combination with chemotherapy

For some kinds of cancers such as early-stage Hodgkin's disease, non-Hodgkin's lymphoma, and certain types of prostate, or brain cancer, radiation therapy alone may cure the disease. In other cases, radiation therapy used in conjunction with surgery, chemotherapy, or both, increases survival rates over any of these therapies used alone.

— Lorraine Lica