As an oncology certified nurse practitioner I have been instructing patients to avoid the use of aluminum based antiperspirants for years. I had read research several years ago that showed a link between fibrocystic breast disease and antiperspirants. My reasoning was that if aluminum was showing up in breasts cysts, it certainly could be linked to breast cancer. Here is research to show that there is in fact a link. More studies and research are needed, of course. But should we wait for definitive proof or be proactive about protecting against breast cancer?