This wont work. (Score -1)

A few reasons why this won't work: a) Portability. Antimatter can't be contained in a small enough space for it to be clinically feasible. b) There's no way to get antimatter inside of you without cutting a hole in you. Which kinda defeats the purpose. c) This is like trying to treat baldness with a nuke. It's overkill. d) The radiation won't be able to be contained easily, and so therefore will probably kill the rest of you. But hey, at least the cancer will be gone.