Does breast density matter for older women’s risk of cancer?

Breast density is a known risk factor for developing breast cancer, but that well-accepted research finding is derived from studies conducted in women under age 75. That makes sense because breast density declines with age, but cancer epidemiologist Dejana Braithwaite of the University of Florida’s Cancer Control and Population Sciences Program wondered about older women: How much does density drop, and how much might it matter?

In an analysis of more than 220,000 mammograms published Thursday in JAMA Oncology, her team reports that density — and the risk of breast cancer — doesn’t disappear.

Read the rest…