Because underarm antiperspirants or deodorants are applied near the breast and contain potentially harmful ingredients, several scientists and others have suggested a possible connection between their use and breast cancer (1, 2). However, no scientific evidence links the use of these products to the development of breast cancer. One contemporary debate that has emerged surrounding breast cancer is whether or not anti-perspirant causes breast cancer. While some scientists believe that breast cancer cells are caused by the use of underarm anti-perspirant or deodorant, others believe that there is no conclusive link between breast cancer and the use of these products.
Antiperspirants and Cancer A few studies in recent years have theorized that aluminum-based antiperspirants may increase the risk for breast cancer. According to . May 24, · The breast quadrants are not of equal size; the nipple is not in the true center of the breast and a significant amount of breast tissue, called the “axillary tail,” extends toward the underarm.
The suggested link between anti-perspirants and breast cancer has come from the idea that sweating helps to rid the body of 'toxins' - and if you prevent sweating by using anti-perspirants, then. Mouse breast cells treated with aluminum chloride, at concentrations that have been detected in human breast tissue, formed large metastatic tumors when implanted back into mice. Judging from this study, it seems plausible that aluminum-based antiperspirants could cause breast cancer.