Point is there is a good chance of over treatment or un-necessary treatment.
Also, personally with American medicine in general is that these so called specialists and statisticians don't put statistics into proper perspective.
First thing to ask or remember is where are these statistics from: The American medical system? Europe? Not only WHERE those statistics came from but WHEN those statistics are from. WHEN...
WHEN statistics are taken from raw data is critical to any study because WHEN could show cause. If many of these statistics were taken from the Cold War Era or from people who were born or lived early in the Cold War especially that could show cause ie nuclear bomb testing and less advanced radiation safety and knowledge for starters. I know people who were X ray technicians in the 1950s and 60s and swore their thyroid problems and numerous cancers were from radiation especially after they saw the advances and changes in radiation safety.
Most medical statistics come from less than 100 years of data with alot of changes in the enviorment, technology AND medical techniques in general. Do 2-3 generations of medical data really show the true history or potential of the family gene pool?
I have other problems with the use of genetics for medicine, profit or to predict outcomes in general in that it's a borderline form of eugenics. Along with being less than the science many believe.
It's Ms Jolie's body she can do as she pleases but when she goes public she knows her personal decision will affect others and sway opinion more than a non celebrity.