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EBRT reduces risk of subsequent mastectomy in patients with invasive breast cancer
Date:1/29/2014

ntified from one year after diagnosis until December 31, 2009, which was the last date of follow-up. The five-year cumulative incidence of subsequent mastectomy for patients with invasive breast cancer was 4.7 percent for those treated with lumpectomy alone, 2.8 percent for those treated with lumpectomy followed by brachytherapy and 1.3 percent for those treated with lumpectomy followed by EBRT. In patients with DCIS, 2.2 percent underwent subsequent mastectomy during follow-up. The five-year cumulative incidence of subsequent mastectomy in patients with DCIS was 3.2 percent for those treated with lumpectomy alone, 4.6 percent for those treated with brachytherapy and 1.6 percent for those treated with EBRT.

In this study, brachytherapy was associated with a greater likelihood of breast preservation than lumpectomy alone, while EBRT showed more likelihood of breast preservation than brachytherapy. When stratified into the ASTRO-defined suitability groups, the study found suitable group patients were the least likely to undergo subsequent mastectomy and had the smallest absolute difference when comparing those treated with brachytherapy and those treated with EBRT. The small number of patients with DCIS treated with brachytherapy in this cohort does not allow definitive conclusions on the effectiveness of brachytherapy for these patients.

"Brachytherapy offered a breast preservation benefit, although in general this benefit was slightly less than the benefit derived from standard external beam radiation therapy," said Benjamin D. Smith, MD, a co-author of the study and associate professor in the Department of Radiation Oncology at The University of Texas MD Anderson Cancer Center. "Our findings suggest that certain patients with very favorable tumors do just as well with either brachytherapy or standard external beam radiation therapy, whereas other patients with higher risk tumors seem to do better with standard external beam radiation therapy."'/>"/>

Contact: Brittany Ashcroft
press@astro.org
703-839-7336
American Society for Radiation Oncology
Source:Eurekalert

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