Increased levels of gamma-tocopherol-the most common form of dietary vitamin E-are linked to a statistically significant reduction in the risk of prostate cancer, recent research suggests. In a study of 117 prostate cancer patients and 233 controls, researchers evaluated concentrations of selenium, gamma-tocopherol and alpha-tocopherol in plasma and toenail samples. While increased levels of all three nutrients were present, researchers found that only levels of gamma-tocopherol were statistically significant. In men with the highest fifth of gamma-tocopherol levels, the risk of prostate cancer was five times lover than in men in the lower fifth. The study was published in the December issue of the Journal of the National Cancer Institute .