Although the exact cause of cancer is unknown there are various things which might put you at risk. For example we cannot live without oxygen that's for sure. But did you know that oxygen in its free radical form can be the main reason behind development of cancer cells? A few basics first - What are free radicals? They are atoms or groups of atoms with unpaired electrons which may be highly reactive. As we grow older or are exposed to certain conditions the rate of production of these oxygen free radicals increases while the ability of the body's immune