The Calgon effect

Washing machines, we have been told, live longer with Calgon: it prevents limescale accumulating on filaments that heat water. Of course it's practically impossible to tell the impact that Calgon is having as the filament is hidden from view and you have no idea what would have happened if you'd never used the product. And so it is with cancer.
Cancer patients live longer with vitamin supplements. I've been taking A, C, E and selenium since I was able to eat again and I'm significantly ahead of the pancreatic tumour mortality index. Whether these antioxidant supplements have anything to do with this is anyone's guess, but I'm not prepared to take the risk of stopping. And when there is spread, interferon will be the new Calgon. It's frustrating knowing that there's limescale building in the machine, but short of pouring a vinegar of chemotherapy into the drum there's little else you can do.