Intraoperative Radiation for Breast Cancer

When a woman has early-stage breast cancer, doctors usually remove just the lump,  not the whole breast. This is called lumpectomy. After surgery, most patients need weeks of radiation therapy. They drive to the hospital Monday through Friday for three to six weeks. Each session takes time, energy, and patience. For someone who lives far from a cancer center, has young children, or works full time, this schedule can feel impossible.

Worse, traditional radiation does not just target cancer cells. It also hits healthy tissue like the heart, lungs, and ribs. Over time, this can cause breathing problems, heart disease, or skin damage.

Intraoperative radiation therapy, or IORT, solves both problems at once. Here is how it works. Right after the surgeon removes the breast lump, while the patient is still asleep on the operating table, a special round device is placed inside the empty space where the tumor used to be. That device delivers a single, strong dose of radiation directly to the area most likely to have leftover cancer cells. The whole thing takes about twenty to thirty extra minutes. Then the surgeon closes the incision, and the patient wakes up. No daily trips to the hospital. No weeks of treatment. No radiation passing through the heart or lungs.

The largest study on this technique is called TARGIT-A. Researchers followed patients for more than twelve years. They found that women who received IORT had just as good cancer control as women who got traditional whole breast radiation. But there was an important extra benefit. Fewer women in the IORT group died from causes other than breast cancer. That is likely because their hearts and lungs were spared unnecessary radiation. IORT is not for everyone. It works best for women who are over sixty, have small tumors that are hormone sensitive, and have no cancer in their lymph nodes. Younger women or those with more aggressive cancer types usually still need traditional radiation. Some patients receive IORT as a "boost",  a extra punch to the tumor bed, followed by shorter, lower‑dose whole‑breast radiation.

For the right patient, IORT removes a huge burden. Instead of rearranging work, finding daily childcare, or temporarily moving closer to a hospital, a woman can have her surgery and radiation all in one morning. She spends the rest of her recovery at home with the people she loves.Intraoperative radiation therapy is not science fiction,  it is a proven option available in many cancer centers today. It offers excellent cancer control, fewer side effects, and far less disruption to daily life.

Written by Nathan Clemente at Incisionary

References

Das, A., et al. (2025). The evolution of targeted intraoperative radiotherapy in early breast cancer. Journal of Cancer Research and Clinical Oncology, 151(9), 249.

Kolberg, H. C. (2025). TARGIT‑IORT in early breast cancer — real world evidence for a risk‑adapted approach. Translational Breast Cancer Research.

Intraoperative radiotherapy in elderly patients with breast cancer: Long‑term follow‑up results of the prospective phase II trial TARGIT‑E. (2025). BMC Cancer, 25, 1862.