Have there been any scientific studies that specifically investigated the possibility of a link between antiperspirants and breast cancer?
Yes. A recent large study of women aged 20-74 published in the Journal of the National Cancer Institute in October 2002, examined the use of antiperspirants in women with breast cancer. The researchers compared antiperspirant use among a group of women who had contracted breast cancer and a second group who were matched in age to the first group, but who had not contracted cancer. Both groups of women used antiperspirants in similar ways, and the scientists running the study found no link between the antiperspirants and breast cancer.