This is because normal cells heal from X-ray damage better than many cancer cells. X-rays, or radiation therapy, have become a very important part of treating many types of cancer, including breast cancer. Radiation therapy is especially important in treating early-stage invasive cancers. Years ago, breast cancer almost always meant the doctor had to take off the entire breast. This treatment also leaves a woman with a much better appearance.
Radiation therapy is almost painless.
Many women and their doctors choose it to help treat their breast cancer.