Talcum powder has become associated with some cancers because evidence has shown during several Johnson & Johnson cancer trials that the company knew some of its raw talc tested positive for asbestos. When talc contains even small quantities of asbestos,there is a higher risk of some cancers. While FDA does not allow there to be asbestos in talcum powder, there is no guarantee all talcum powder is free of the contaminant.
Some studies have linked talc-based powders to ovarian cancer. Women may dust their genitals on a regular basis with baby powder. If it is tainted with asbestos, it can work its way into the ovaries and cause cancer.
Some women who used baby powder in this manner also have breathed the dust into their lungs, and the asbestos in the dust caused mesothelioma, an aggressive cancer of the lung lining that is usually fatal.