New research out of Hong Kong suggests that sunlight across the lifespan may decrease the risk of breast cancer.
One strong risk factor for breast cancer are particularly dense breasts. Density and density patterns can be assessed using the well-known screening tool, mammograms. When looking at breast density via a mammogram, there are a few different scales developed to describe the density and density pattern of the breast, with scales generally ranging from non-dense to dense.
One such classification scale is the Tabár classification, which grades patterns I-V. Patterns I, II and III are considered low risk for breast cancer, while patterns IV and V are considered high risk for breast cancer.
In this recent study, Dr Sheng-Hui Wu and colleagues wanted to know, does past sunlight exposure correlate with breast density? And subsequently, does sunlight correlate with breast cancer risk?