Selenium and Cancer. The Clark study 1996 suggested selenium might reduce cancer mortality. Cancer prevention stated that with a supplement 200mcg a day and compared to placebo. It reduced cancer incidents remarkably by 63% in prostate, 58% in colon and 46% in Lung cancer. This suggested that maybe Se could be used as a cancer preventive. This brought on a huge study named SELECT, the study of Selenium & Vitamin E Cancer Prevention Trial. The result was that healthy men would possibly not benefit form selenium for cancer prevention. Some make argument that finding may have resulted differently if they used men with low selenium status compared to healthy men (Arner,
