I remember hearing that some absurd number of breast cancer patients used an 'anti perspirant' which clogged their lymph nodes and helped increase risk of cancer.

I'm not a doctor but I did look into it as best as I could. One of the nice things is that aluminum powder is found in several forms in anti-perspirants (it is, in short, what keeps you from perspiring) but not in deodorants. I personally use old spice high endurance deodorant.

That being said, the aluminum compounds used have been tested repeatedly and have been proven safe. As best as I can tell the problem is actually that you are keeping the toxins in your body by preventing the sweat from pulling it out of the lymph system - and THAT is what is actually dangerous.