Yarmolinsky J, et al. - Researchers performed Mendelian randomization analyses to study the association between selenium supplementation and prostate cancer risk. They constructed a genetic instrument including 11 single nucleotide polymorphisms strongly related to circulating selenium in genome-wide association studies. Findings showed that in the prevention of prostate cancer, selenium supplementation did not have any role. Moreover, data suggested that selenium supplementation could have adverse influence on risks of advanced prostate cancer and type 2 diabetes.