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

Fairfax, Va., January 29, 2014 Standard external beam radiation therapy (EBRT) provided a higher breast preservation rate than brachytherapy in women age 66 and older with invasive breast cancer, according to a study published in the February 1, 2014 print edition of the International Journal of Radiation Oncology • Biology • Physics (Red Journal), the official scientific journal of the American Society for Radiation Oncology (ASTRO).

Brachytherapy after lumpectomy is an increasingly popular treatment protocol for breast cancer; however, there is conflicting data regarding its effectiveness. Additionally, published suitability criteria directing patient selection for brachytherapy have not been empirically validated. This study compares the long-term likelihood of breast preservation, risks of post-operative complications and local toxicities, and validity of suitability categories of three treatment strategies after lumpectomy: EBRT, brachytherapy and no radiation.

This study used the Surveillance, Epidemiology and End Results (SEER)-Medicare linked database to identify 35,947 women, age 66 and older, diagnosed with invasive breast cancer (79.9 percent) or ductal carcinoma in situ (DCIS) (20.1 percent) from 2002 to 2007 and treated with lumpectomy alone (23 percent), lumpectomy followed by brachytherapy (3.6 percent) or lumpectomy followed by EBRT (73.4 percent). Patients with invasive breast cancer were also classified as suitable (34.7 percent), cautionary (17.6 percent) or unsuitable (35.2 percent) for brachytherapy based on ASTRO's Accelerated Partial Breast Irradiation Consensus Statement. Twelve-and-a-half percent of patients were unclassified. The patients with DCIS in this study were analyzed separately. For this study, patients age 70 or older were classified as "older suitable."

The median follow-up for patients was 3.5 years. For this study, subsequent mastectomy is defined as a claim for mastectomy ide
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Contact: Brittany Ashcroft
press@astro.org
703-839-7336
American Society for Radiation Oncology
Source:Eurekalert

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