Further analysis of the Women's Health Initiative data has revealed that women who drink 4+ cups of coffee per day have 25% less risk of endometrial cancer than women who drink one or less. Drinking 2 or more cups of decaf per day was associated with a 22% risk reduction but the sample size was too small to have statistical significance. The strongest inverse association between coffee drinking and endometrial cancer was among obese women.
SOURCES
http://www.medscape.com/viewarticle/754053?src=mpnews&spon=16
http://cebp.aacrjournals.org/content/early/2011/10/03/1055-9965.EPI-11-0766.abstract