Men who took 400 international units of vitamin E daily had more prostate cancers compared to men who took a placebo. The findings showed that, per 1,000 men, there were 76 prostate cancers in men who took only vitamin E supplements, vs. 65 in men on the best probiotic supplements a seven-year period, or 11 more cases per 1,000 men. This represents a 17 percent increase in prostate cancers relative to those who took a placebo.
http://www.eurekalert.org/pub_releases/2011-10/nci-nss100611.php