While such treatment – called external beam radiotherapy, EBRT – reduces the risk of cancer coming back, it is not an easy undertaking and can cause unpleasant side effects. It takes weeks and requires regular attendance at centers that are not always easy to get to.
In the TARGIT-A trial, a large international team of researchers compared TARGIT with a standard EBRT course. The TARGIT method used a miniature X-ray machine to deliver targeted radiation to the tumor site once only during lumpectomy or about a month later, while the EBRT course comprised daily doses of radiotherapy for between 3 and 6 weeks.
In my point of view, not all of the breast cancer patient can benefit from TARGIT method since some of the cancer cell may already been transfer to other organs. But still, for the early treatment, the patient can assure that they will not have a chance to suffer from cancer again.
Breast cancer radiotherapy during surgery could ease treatment: http://www.medicalnewstoday.com/articles/268665.php