title: Largest-ever prostate cancer prevention trial.
mesh_terms: D002986:Clinical Trials as Topic; D006801:Humans; D008297:Male; D015337:Multicenter Studies as Topic; D010358:Patient Participation; D011471:Prostatic Neoplasms / Q000517:prevention & control*; D012643:Selenium / Q000627:therapeutic use*; D014810:Vitamin E / Q000627:therapeutic use*
chemical_list: D014810:Vitamin E; D012643:Selenium