In August 2019 researchers from China and Canada published their review on the association between whole grains and the incidence of breast cancer. The researchers stated that some studies have found that a high intake of whole grains reduces the risk of breast cancer. This is due to whole grains being the most fundamental and important food source of phytochemicals, which have been shown to have well-defined roles in the management of each stage of breast cancer.
Xie M et al. Whole Grain Consumption for the Prevention and Treatment of Breast Cancer. Nutrients. 2019 Aug 1;11(8). pii: E1769