NCT00153816 2017-03-15Vitamin D/Calcium Polyp Prevention StudyDartmouth-Hitchcock Medical CenterPhase 2/3 Completed2,813 enrolled 15 charts
NCT01074216 2016-02-03Vitamin D Levels in Stage IV Colorectal Cancer PatientsMemorial Sloan Kettering Cancer CenterPhase 2 Completed45 enrolled 6 charts