Radiation therapy uses high energy x-rays to destroy cancer cells. A radiation oncologist will customize the treatment dose for individual needs. The goal is to try and kill as much cancer while minimizing harm to healthy tissue. Radiation therapy is generally most effective when used in combination with other treatments, such as surgery and chemotherapy. Radiation therapy for breast cancer is often used after surgery to target any possible remaining cancer cells. It may also be used to shrink large tumors that are causing symptoms.
There are different types of radiation therapy, but external beam radiation is more commonly used to treat breast cancer.
In external beam radiation therapy, radiation is produced by a machine positioned outside the body. Short bursts of x-rays are directed at the cancer to affect as much cancer as possible. The radiation oncologist will determine how many treatments you will receive.
In general, radiation therapy is recommended:
Newer types of 3-dimensional (3-D) technology include intensity modulated treatment (IMRT) and conformal radiation therapy. The beams surround all sides of the tumor. This allows for more intense radiation to be delivered to the tumor. It also decreases the amount of damage to surrounding healthy tissue and has fewer side effects. These therapies are still being studied and may not be available in all areas.
Generally, external beam radiation only takes a few minutes, and the total treatment time can range from 5-8 weeks, depending on the total dose required. In most cases, radiation is given 5 days a week. For some, an accelerated treatments may be an option. This approach is known as hypofractionated radiation therapy and allows for more intense radiation less days per week for a shorter duration of time.
Brachytherapy, or internal radiation therapy delivers radiation directly to the cancer. The radioactive material is implanted inside the body near or in the cancer tumor.
Brachytherapy options include:
Complications of radiation therapy to the chest may include:
A variety of treatments are available to help manage side effects of radiation therapy, such as dry, irritated skin, nausea, vomiting, diarrhea, and fatigue due to anemia. Sometimes adjustments to treatment doses may also be possible. The earlier side effects are addressed, the more likely they will be controlled with a minimum of discomfort.
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Breast cancer. Merck Manual Professional Version website. Available at: http://www.merckmanuals.com/professional/gynecology-and-obstetrics/breast-disorders/breast-cancer. Updated September 2013. Accessed October 28, 2015.
Breast cancer in women. EBSCO DynaMed Plus website. Available at: http://www.dynamed.com/topics/dmp~AN~T113654/Breast-cancer-in-women. Updated September 14, 2016. Accessed October 3, 2016.
Intensity-modulated radiation therapy (IMRT). Radiological Society of America Radiology Info website. Available at: http://www.radiologyinfo.org/en/info.cfm?pg=imrt. Updated June 25, 2015. Accessed October 28, 2015.
Radiation therapy for breast cancer. EBSCO DynaMed Plus website. Available at: http://www.dynamed.com/topics/dmp~AN~T901113/Radiation-therapy-for-breast-cancer. Updated December 22, 2015. Accessed October 3, 2016.
Treatment option overview. National Cancer Institute website. Available at: http://www.cancer.gov/types/breast/patient/breast-treatment-pdq#section/_185. Updated October 22, 2015. Accessed October 28, 2015.
What is 3D conformal radiation therapy? University of Pittsburgh Medical Center website. Available at: http://www.upmccancercenter.com/radonc/conformal.cfm. Accessed October 28, 2015.
7/26/2010 DynaMed Plus Systematic Literature Surveillance: http://www.dynamed.com/topics/dmp~AN~T113654/Breast-cancer-in-women. Vaidya JS, Joseph DJ, Tobias JS, et al. Targeted intraoperative radiotherapy versus whole breast radiotherapy for breast cancer (TARGIT-A trial): an international, prospective, randomised, non-inferiority phase 3 trial. Lancet. 2010;376(9735):91-102.
Last reviewed December 2014 by Mohei Abouzied, MD
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.