3 Weeks of Breast Radiation Had Similar Reconstruction Complications as 5 Weeks

For women with breast cancer who need radiation after a mastectomy and want breast reconstruction, a shorter course of radiation was as safe for the reconstruction as the standard, longer course. The results of the phase 3 RT CHARM trial (Alliance A221505) were published online Oct. 12, 2026, in the Journal of Clinical Oncology.

Women who received about three weeks of radiation had reconstruction complications at a similar rate to those who received five weeks: 12.3% vs. 10.2%. Cancer returned near the chest in very few women in either group.

Who Was in the Trial?

The trial, run by the National Cancer Institute-funded Alliance for Clinical Trials in Oncology, enrolled 898 women from 2018 to 2021 at centers in the United States and Canada. All had invasive cancer in one breast, had a mastectomy, needed radiation to the chest wall and nearby lymph nodes (postmastectomy radiation), and planned breast reconstruction, either right away (immediate) or later (delayed).

According to results first presented at the American Society for Radiation Oncology (ASTRO) meeting in 2024, most women had either a tumor larger than 5 centimeters without lymph node spread, or a smaller tumor that had spread to one to nine lymph nodes. Their median age was 46. Some had implant-based reconstruction, and others had reconstruction using their own tissue (called autologous reconstruction), sometimes combined with an implant.

What the Trial Tested

Women were randomly assigned to one of two radiation schedules:

• Shorter course (hypofractionated): 16 treatments over about three weeks, with a slightly larger dose per treatment.
• Standard course: 25 treatments over five weeks.

The main goal was to see whether the shorter schedule was no worse for the reconstruction. Researchers counted complications within 24 months, including wound-healing problems, hospital readmission, hardening of scar tissue around an implant (capsular contracture), unplanned additional surgery and loss of the reconstruction.

What It Found

Of 825 women whose results were available for this analysis, 52 of 422 (12.3%) in the shorter-course group and 41 of 403 (10.2%) in the standard group had a reconstruction complication. That difference fell within the limit the researchers set in advance, so the shorter course was judged "noninferior," meaning not meaningfully worse.

Cancer control was similar. At three years, cancer had come back in the chest wall or nearby lymph nodes in 1.5% of women who had the shorter course and 2.2% of those who had the standard course, a difference that was not statistically significant. Median follow-up was 3.9 years.

The type of reconstruction mattered more than the radiation schedule. Women who had implant-only reconstruction had more complications than women whose reconstruction used their own tissue, regardless of which schedule they received.

The authors concluded that "a 16-fraction course of hypofractionated PMRT is safe and noninferior to conventional PMRT in women undergoing breast reconstruction after mastectomy."

Side Effects

Short-term and long-term radiation side effects, such as skin irritation, were not statistically different between the two groups, according to the published summary.

What It Means for You

Shorter radiation schedules are already standard for many women after lumpectomy, and CURE recently reported on 10-year results showing three weeks of radiation after mastectomy worked as well as five. Doctors have been more cautious about shortening treatment when a reconstruction is in place. This trial adds strong evidence that a three-week course is a reasonable option in that setting, which can mean 9 fewer trips to the radiation center and less time away from work and family.

Radiation schedules are chosen with your radiation oncologist and plastic surgeon together, based on your cancer, your type of reconstruction and your timing.

What's Still Unknown

Follow-up so far is about four years, and the trial was not designed mainly to compare cancer recurrence or survival, so longer follow-up will help confirm the results. The trial included women with cancer in one breast only, and complication rates were lower than researchers expected in both groups.

Questions to Ask Your Care Team

• Am I a candidate for a three-week radiation course after mastectomy?
• How does my type of reconstruction, implant or my own tissue, affect my risk of complications with radiation?
• Should my reconstruction be done before or after radiation?
• What skin and reconstruction changes should I watch for during and after radiation?

References

1. "Randomized Trial of Hypofractionated Postmastectomy Radiation Therapy in Women With Breast Reconstruction (RT CHARM, Alliance A221505)." Poppe MM, et al. Journal of Clinical Oncology. Oct. 12, 2026.
2. "Post-mastectomy radiation therapy can be shortened by nearly half for patients planning breast reconstruction." American Society for Radiation Oncology. Sept. 30, 2024.