Breast cancer - radiation therapy; Carcinoma of the breast - radiation therapy; External beam radiation - breast; Intensity-modulated radiation therapy - breast cancer; Radiation - whole breast; WBRT; Breast radiation - adjuvant; Breast radiation
Whole breast radiation therapy uses high-powered x-rays to kill breast cancer cells. With this type of directed radiation therapy, the whole breast (or chest wall if the breast was removed) receives the radiation treatment.
Cancer cells multiply faster than normal cells in the body. Because radiation is most harmful to quickly growing cells, radiation therapy damages cancer cells more than it damages the slower growing normal cells. This prevents the cancer cells from growing and dividing, and leads to cancer cell death.
This type of radiation is delivered by an x-ray machine that delivers a precise area of radiation either to the whole breast, or the chest wall (if done after mastectomy). Sometimes, radiation will also target the lymph nodes in the armpit or neck area or under the breast bone.
You may receive radiation treatment either in a hospital or in a private outpatient radiation center. You will go home after each treatment. A typical course of treatment is given 5 days a week for 3 to 6 weeks. During treatment, the treatment beam is on for only a few minutes. Often each treatment is scheduled the same time each day for your convenience. You are not radioactive after treatment.
Before you have any radiation treatment, you will meet with the radiation oncologist. This is a doctor who specializes in radiation therapy.
Before radiation is delivered there is a planning process called a "simulation" where the cancer and normal tissues are mapped. Sometimes the doctor will recommend small skin marks called "tattoos" to help line you up and improve the accuracy of the radiation therapy.
During each treatment session:
After surgery, cancer cells may remain in the breast tissue or lymph nodes. Radiation can help kill the remaining cancer cells. When radiation is delivered after surgery is performed, it is called adjuvant (additional) treatment.
Adding radiation therapy can kill the remaining cancer cells and lower the risk of the cancer growing back.
Whole breast radiation therapy may be given for several different cancer types:
Tell your health care provider what medicines you are taking.
Wear loose-fitting clothes to the treatments. You may be asked to wear a special bra.
You are not radioactive after radiation treatments. It is safe to be around others, including babies or children. As soon as the machine stops, there is no more radiation in the room.
Radiation therapy, like any cancer therapy, can also damage or kill healthy cells. The death of healthy cells can lead to side effects. These side effects depend on the dose of radiation and how often you have the therapy.
Side effects can develop early during treatment (within a few weeks) and be short-lived, or they may be more lasting long-term side effects. Late side effects can happen months or years later.
Early side effects that can begin 1 to 3 weeks after your first treatment may include:
Most of these changes should go away about 4 to 6 weeks after the radiation treatment is over.
Your provider will explain care at home during and after radiation treatment.
Late (long-term) side effects may include:
Whole breast radiation therapy following breast-conserving surgery reduces the risk of cancer coming back and reduces the risk of death from breast cancer.
Alluri P, Jagsi R. Postmastectomy radiotherapy. In: Bland KI, Copeland EM, Klimberg VS, Gradishar WJ, eds. The Breast: Comprehensive Management of Benign and Malignant Diseases. 5th ed. Philadelphia, PA: Elsevier; 2018:chap 49.
National Cancer Institute website. Breast cancer treatment (Adult) (PDQ) - health professional version. www.cancer.gov/types/breast/hp/breast-treatment-pdq. Updated February 9, 2023. Accessed February 28, 2023.
National Cancer Institute website. Radiation therapy and you: support for people who have cancer. www.cancer.gov/publications/patient-education/radiation-therapy-and-you. Updated April 2021. Accessed November 18, 2022.
BACK TO TOPReview Date: 7/23/2022
Reviewed By: David Herold, MD, Radiation Oncologist in Jupiter, FL. Review provided by VeriMed Healthcare Network. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team. Editorial update 02/28/2023.
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