Physical Activity and Breast Cancer: Focusing on High-Risk Subgroups and Putting Recommendations in Context.

While it is well-established that physical activity is associated with a decreased risk of breast cancer, most studies have been conducted in populations at an average underlying breast cancer risk. In this issue of Cancer Research, Kehm and colleagues present compelling evidence that adulthood physical activity is beneficial across the risk spectrum, including among women with BRCA1 and BRCA2 mutations. These findings are significant because women who are at a higher baseline risk are not engaging in sufficient physical activity to meet current guidelines but may be more motivated to do so knowing that they, like women in the general population, may benefit.See related article by Kehm et al., p. 116.