This is not the case. It is claimed that there are toxins in perspiration that are deposited in lymph nodes under the arm if one does not perspire and that these toxins can then cause breast cancer. This is Not True. Toxins are metabolized in the liver and excreted through the kidneys. Men also get breast cancer but the incidence is 100 times less.
Men use more anti-perspirants than women do.
One would thus have expected an explosion of breast cancer in men after the advent of anti-perspirants. This has simply not happened. The incidence of breast cancer in men has remained stable over many years. It is valid to ask why the same increase in breast cancer risk is not seen with men. Men do get breast cancer at a rate 100 times less than women.