1.	Phase III Study of the Effect of Vitamin E and/or Selenium on Adenomatous 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 Protocol IDs: SWOG-S0000D, S0000D, NCT00706121
2.	Study of Antioxidants on MRI Detectable Early Stage Prostate Cancer Among Men on Active Surveillance Phase: Phase II Type: Diagnostic, Treatment Status: Active Age: 18 and over Sponsor: Other Protocol IDs: 07-0580-B, NCT00744549
3.	Study of Antioxidants on Prostate Tumors in Men Undergoing Radical Prostatectomy for Prostate Cancer Phase: Phase II Type: Treatment Status: Active Age: 18 and over Sponsor: Other Protocol IDs: 08-0604-CE, NCT00844792
4.	Evaluation of the Use of Trental and Vitamin E For Prophylaxis of Radiation Necrosis Phase: Phase II Type: Supportive care Status: Active Age: 18 and over Sponsor: Other Protocol IDs: BTC-W1, NCT01508221
5.	Vitamin E Supplements in Treating Patients Undergoing Surgery for Colorectal Cancer Phase: Phase I Type: Biomarker/Laboratory analysis, Treatment Status: Active Age: 18 and over Sponsor: NCI, Other Protocol IDs: 120901, CDR0000642446, IRB#0220090065, CINJ-120901, NCT00905918
6.	Vitamin E d-Tocotrienol Administered to Subjects With Resectable Pancreatic Exocrine Neoplasia Phase: Phase I Type: Treatment Status: Active Age: 18 and over Sponsor: NCI, Other Protocol IDs: MCC-15630, 1R01CA129227-01A1, NCT00985777