672
Participants
Start Date
May 31, 1996
Primary Completion Date
March 31, 2004
Study Completion Date
February 1, 2017
Folic acid
Intervention group 1g folic acid per day
Placebo
One placebo pill per day
National Cancer Institute (NCI)
NIH
Dana-Farber/Brigham and Women's Cancer Center
OTHER
Brigham and Women's Hospital
OTHER