Antiperspirants/Deodorants and Breast Cancer - National. 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 .
Most breast cancers develop in the upper outer quadrant of the breast because that area is closest to the lymph nodes exposed to antiperspirants. (Think of the breast as a circle divided by vertical . May 24, · In a study led by Dana K. Mirick, an epidemiologist at the Fred Hutchinson Cancer Research Center in Seattle, found no link between breast cancer and the use of anti-perspirants.
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.