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Reduced invasive recurrence after DCIS does not reduce mortality

Radiotherapy after breast-conserving surgery for ductal carcinoma in situ reduces the risk of ipsilateral invasive recurrence but does not reduce breast cancer mortality, new research shows.

Analysis of data from 108,196 women diagnosed with ductal carcinoma in situ (DCIS), who were included in the Surveillance, Epidemiology, and End Results (SEER) 18 registries database, showed radiotherapy significantly reduced the risk of ipsilateral invasive recurrence at 10 years (adjusted hazard, 0.47; 95% confidence interval, 0.42-0.53; P less than .001) but only achieved a nonsignificant reduction in breast cancer mortality (adjusted HR, 0.81; 95% CI, 0.63-1.04; P = .10).

“The finding of greatest clinical importance was that prevention of ipsilateral invasive recurrence did not prevent death from breast cancer,” wrote Dr. Steven A. Narod and his colleagues from the Women’s College Hospital and the University of Toronto.

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