The primary endpoint is the reduction of the risk of all important vascular events (a combined endpoint of nonfatal myocardial infarction, nonfatal stroke, and total cardiovascular death) and a decrease in the incidence of total malignant neoplasms of epithelial cell origin. Secondary endpoints are the individual components of the combined endpoints. Compliance is measured by replies to a questionnaire sent out every year. The trial was completed in 2004 and results were published in 2005 (N Engl J Med 2005;352:1293-304; JAMA 2005;294:47-55; JAMA 2005;294:56-65).