1.	Selenium for Prevention of Adenomatous Colorectal Polyps Phase: Phase III Type: Prevention Status: Active Age: 40 to 80 Sponsor: NCI, Other Protocol IDs: CDR0000353185, P30CA023074, UARIZ-00-0430-01, UARIZ-HSC-00142, P01CA041108, 00-0430-01, NCT00078897
2.	S0000D: Effect of Vitamin E and/or Selenium on Colorectal Polyps in Men Enrolled on SELECT Trial SWOG-S0000 Phase: Phase III Type: Natural history/Epidemiology, Prevention Status: Active Age: 50 and over Sponsor: NCI, Other Protocol IDs: CDR0000593329, S0000D, U10CA037429, SWOG-S0000D, NCT00706121
3.	S0820, Adenoma and Second Primary Prevention Trial Phase: Phase III Type: Prevention Status: Active Age: 18 and over Sponsor: NCI, Other Protocol IDs: S0820, U10CA037429, NCI-2012-02067, NCT01349881
4.	Inositol in Preventing Colorectal Cancer in Patients With Colitis-Associated Dysplasia Phase: Phase II, Phase I Type: Biomarker/Laboratory analysis, Prevention Status: Active Age: 18 and over Sponsor: NCI Protocol IDs: NCI-2011-01434, NCI09-13-02, CDR0000671302, N01CN03515, NU-NWU09-13-02, NWU09-13-02, NCT01111292
5.	Polyethylene Glycol 3350 in Preventing Cancer in Patients at Risk of Colorectal Cancer Phase: Phase II Type: Biomarker/Laboratory analysis, Prevention Status: Active Age: 18 and over Sponsor: NCI Protocol IDs: NCI-2009-01113, NCI06-8-01, CDR0000632553, N01CN35157, NU-NWU06-8-01, NWU06-8-01, NCT00828984
6.	Acetylsalicylic Acid and Eflornithine in Treating Patients at High Risk for Colorectal Cancer Phase: Phase II Type: Biomarker/Laboratory analysis, Natural history/Epidemiology, Prevention Status: Active Age: 40 to 120 Sponsor: NCI Protocol IDs: NCI-2009-01192, MC054A, R01CA113681, NCT00983580
7.	A Clinical Trial of COX and EGFR Inhibition in Familial Polyposis Patients Phase: Phase II Type: Biomarker/Laboratory analysis, Prevention Status: Active Age: 18 to 69 Sponsor: NCI, Other Protocol IDs: 00039278, P01CA073992, NCT01187901
8.	A Trial of Metformin for Colorectal Cancer Risk Reduction Among Patients With a History of Colorectal Adenomas and Elevated Body Mass Index Phase: Phase II Type: Biomarker/Laboratory analysis, Prevention Status: Active Age: 35 to 80 Sponsor: NCI Protocol IDs: NCI-2011-01744, 2010-7705, UCI 10-31, UCI09-13-01, N01CN35160, NCT01312467
9.	Phase II Randomized Study of Green Tea Catechin Extract in Patients at High-Risk for Recurrent Colonic Neoplasia Phase: Phase II Type: Biomarker/Laboratory analysis, Prevention Status: Active Age: 40 and over Sponsor: NCI Protocol IDs: MAYO-MC084C, MC084C, R01-CA-132991
10.	Fish Oil Supplementation, Nutrigenomics and Colorectal Cancer Prevention Phase: Phase II Type: Biomarker/Laboratory analysis, Prevention Status: Approved-not yet active Age: 40 to 79 Sponsor: NCI, Other Protocol IDs: 11165, R01CA160938, NCT01661764
11.	Cruciferous Vegetable Intake and Histone Status in Screening Colonoscopy Patients Phase: No phase specified Type: Biomarker/Laboratory analysis, Prevention, Screening Status: Active Age: 50 to 75 Sponsor: NCI, Other Protocol IDs: P01 CA090890, NCT01344330
12.	FLAX FX, A Research Study of the Effects of Flaxseed Lignans on Colon Health Phase: No phase specified Type: Biomarker/Laboratory analysis, Prevention Status: Active Age: 20 to 45 Sponsor: NCI, Other Protocol IDs: FHCRC IR 7532, NCT01619020