http://www.breastcancerchoices.org/rr.html This link explains the difference between relative and absolute statistics.
http://www.opposingviews.com/i/health/conditions/cancer/tamoxifen-what-difference-does-it-really-make Relative vs. absolute rates for Tamoxifren.
http://www.usatoday.com/story/news/nation/2013/03/13/radiation-heart-breast-cancer/1980735/
Radiation causes increased risk in heart problems.
