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External beam RT for early-stage breast cancer does not increase mortality risks
Date:9/24/2013

Atlanta, September 24, 2013Early-stage breast cancer patients who receive external beam therapy (XRT) are not at higher risk for serious long-term side effects in the chest area, including increase in deaths from cardiac disease and secondary malignancies, according to research presented today at the American Society for Radiation Oncology's (ASTRO's) 55th Annual Meeting.

The study utilized patient information from the National Cancer Institute's Surveillance, Epidemiology and End Results (SEER) database. It evaluated women identified as having primary Stage T1aN0 breast cancer (tumor of 5mm or less that has not spread to the lymph nodes), who received surgery, with or without post-operative radiation therapy, between 1990 and 1997. The analysis was done to determine if XRT was associated with increased mortality due to breast cancer, secondary cancer in the chest area or cardiac conditions for these patients; only patients with breast cancer (BC) identified as the first malignancy were included. The women had a median age of 55-59 and were divided into two groups: 2,397 who received XRT after surgery, and 2,988 who did not receive XRT after surgery.

Cause of death (COD) codes were used to identify cardiac mortality, breast cancer mortality, and deaths from secondary chest cancers in order to assess overall survival (OS), breast cancer survival (BCS), second-tumor specific survival and cardiac-cause specific survival (CCS), and then compared between the XRT and non-XRT groups. The incidence of mortality was compared between the XRT and non-XRT groups utilizing the Chi-Square test; and, the relative risk (RR) and associated 95 percent confidence interval (CI) were calculated. Kaplan-Meier survival analysis and log-rank test were performed to assess OS, BCS, second-tumor specific survival and CCS.

At 10 years post-treatment, OS rates were 91.6 percent for the XRT patients and 87 percent for the non-XRT group; BCS rates were 97 perce
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Contact: Michelle Kirkwood
michellek@astro.org
703-286-1600
American Society for Radiation Oncology
Source:Eurekalert

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