Prior studies have shown a relationship between the supplements Selenium and Vitamin E and preventing prostate cancer. In 2008, researchers from the "SELECT" or Selenium and Vitamin E Cancer Prevention Trial found taking extra doses of these supplements did not help prevent the disease. Researchers then continued following the men even though they stopped taking the supplements. Long-term follow-up results show that men who took Vitamin E during the trial had an increased risk of developing prostate cancer. Catherine Dolf explains in this week's JAMA Report.