Men are about 100 times less likely than women to develop breast cancer. This is because they have about 100 times less breast tissue. Hormonal factors also play a role.
"There is absolutely no scientific evidence that anti-perspirants cause or even increase a woman's risk for breast cancer," said Debbie Saslow, PhD, director of breast and cervical cancer for the American Cancer Society. "Unfortunately the 'leading' risk factors for breast cancer are things that women cannot do anything about: being a woman, aging, and having a personal or family history of breast cancer."
This may be true for now... BUT what is going to motivate the AMA or the ACS to research the relationship between Breast Cancer and Antiperspirants when one of the largest donors to the American Cancer Society is Proctor and Gamble? the makers of Sure Antiperspirant... hmmm... fox.. henhouse???