Thomas Shey
Legend
Actually, it does! I've been watching Hank Green's cancer treatment process over on YouTube, and he mentions that the radiation therapy he received to treat his Hodgkin's Lymphoma also makes it so that he's now more likely to get leukemia.
God sure has a weird sense of humour.
Well, anything that isn't really precisely targeted is going to do that sort of things; in its way, its like trying to cure fungus infections--anything liable to kill the fungus will probably do you no world of good. After all, its not like cancer is a foreign invader; its your own damn cells having gone nuts.