NCT00078897 2019-09-24Selenium for Prevention of Adenomatous Colorectal PolypsUniversity of ArizonaPhase 3 Terminated1,621 enrolled 12 charts
NCT00153816 2017-03-15Vitamin D/Calcium Polyp Prevention StudyDartmouth-Hitchcock Medical CenterPhase 2/3 Completed2,813 enrolled 15 charts