13,475
Participants
Start Date
July 31, 2004
Primary Completion Date
November 30, 2017
Study Completion Date
May 31, 2018
selenium
200 mcg daily for 7-12 years
vitamin E
400 IU daily by mouth for 7-12 years
vitamin E placebo
daily for 7-12 years
selenium placebo
daily for 7-12 years
Harvard Medical School, Boston
National Cancer Institute (NCI)
NIH
National Eye Institute (NEI)
NIH
SWOG Cancer Research Network
NETWORK