August 28, 2012 — According to the American College of Radiology (ACR), a paper by Gierach et al. in the Journal of the National Cancer Institute (which is not the National Cancer Institute's journal) says that, although they are at a small increased risk of developing breast cancer, women with dense breast tissue (a large percentage of fibrous and glandular tissues) are not at an increased risk of dying from breast cancer when compared to women with mostly fat in their breasts.