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December 24/31, 2003

Exercise and Risk of Breast Cancer—ReplyExercise and Risk of Breast Cancer—Reply

Author Affiliations

Letters Section Editor: Stephen J. Lurie, MD, PhD, Senior Editor.

JAMA. 2003;290(24):3193. doi:10.1001/jama.290.24.3193-a

In Reply: We agree with Dr Burke that the optimal proof of the role of physical activity in the etiology of breast cancer would come from a randomized clinical trial. Short of that, randomized controlled trials of the effect of physical activity on biomarkers of breast cancer would be useful.1 Unfortunately, few such studies are available.2

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