Radiation therapy can harm normal tissue, so it needs to be carefully planned and precisely given. This helps ensure the radiation kills as many cancer cells as possible while doing as little damage as possible to other parts of your body.
Radiation therapy is planned specifically for your breast cancer and the shape of your body, so sessions cannot be split between different treatment centers. Your therapy plan is based on:
- Tumor size, type and location
- The number of lymph nodes that contain cancer
- The type of breast surgery (and lymph node surgery) you had
- The shape of your breast and your body
Your radiation oncologist oversees the radiation planning session. During the planning session, you will lie on a special table while the radiation oncologist decides the proper dose of radiation and the best areas to receive the radiation. He/she will use a CT scan to guide the radiation planning.
During the planning session, the radiation oncologist will put small marks (about the size of a pinhead) on your skin. These marks ensure you are correctly positioned for each treatment. They may be ink spots, or they may be tattoos. If they are ink spots, it is important not to wash them off until after you finish radiation therapy.
Radiation therapy sessions
Your radiation oncologist leads a team that includes technicians and nurses. The team will work with you at each radiation therapy session. During each session, you will lie on a special table. Most often, your entire breast will be given a dose of radiation. If lymph nodes removed during surgery were found to have cancer, often the area around the lymph nodes is also treated with radiation. Learn more about lymph nodes.
Each session lasts about 20 minutes. Most of this time is spent positioning your body to ensure the treatment is given exactly as planned. Treatment is usually given once a day, five days a week, for three to seven weeks. The schedule of radiation sessions is designed to treat your breast cancer and varies from person to person.
Accelerated, hypofractionated whole-breast irradiation
Some women may get a shortened course (only three to four weeks) of radiation therapy . This is called accelerated, hypofractionated whole-breast irradiation and is like standard radiation therapy except that it uses a slightly higher dose of radiation per session (hypofractionation). This reduces the number of treatment sessions (making this an accelerated therapy).
After your radiation therapy sessions end, you may have more radiation (called a boost) to the part of the breast that had the original tumor. This boost radiation is given to increase the amount of radiation therapy given to the area at highest risk for breast cancer recurrence. Your boost radiation session is similar to a regular session.
Things to remember while going through radiation therapy
- Do not wash the ink marks off your skin.
- Check with your radiation team before putting any lotions or powders on the affected area.
- Wear clothing that is easy to take off in case you need to change into a hospital gown.
- Use reliable birth control to prevent pregnancy (radiation can harm a fetus).
- Keep the treated area out of the sun.
- Tell your health care provider about any side effects (learn more). .
Adapted from the National Cancer Institute materials .
Transportation and lodging assistance
If you do not live near the radiation treatment center, it can be hard to get to and from therapy sessions. Sometimes, there are programs that offer help with local or long-distance transportation and lodging. Learn more about these programs.
Komen Support Resources
- Our breast care helpline 1-877 GO KOMEN (1-877-465-6636) provides free, professional support services and help finding local support groups and resources. Our trained and caring staff are available to you and your family Monday through Friday from 9:00 a.m. to 10:00 p.m. ET and from 6:00 a.m. to 7:00 p.m. PT.
- Our Message Boards offer online forums for breast cancer survivors, including a forum on radiation therapy, to share their experiences and advice with other breast cancer survivors.
- Our fact sheets, booklets and other education materials offer additional information for survivors.