I have worked in healthcare for 30+ years and in cancer research programs for 7 years. There is nothing new about breast removal. They were doing it back in the 70's for women who had severe fibrocystic disease which was once thought to be a serious precursor to breast cancer--they have since found that is not true.
I am not prepared to argue with these stats, but the reality is when they remove a woman's breast tissue, there is no guarantee that they have removed all of it which still leaves a potential.
Many people have a genetic pre-disposition to colon cancer as well. As the other posters have been mentioning--how many organs can we have removed to insure that we don't get cancer. Sure thing is--none of us are getting out of here alive!