RT Journal Article SR Electronic T1 Primary prevention trials in Alzheimer disease JF Neurology JO Neurology FD Lippincott Williams & Wilkins SP S2 OP S5 DO 10.1212/WNL.67.9_suppl_3.S2 VO 67 IS 9 suppl 3 A1 Green, Robert C. A1 DeKosky, Steven T. YR 2006 UL http://n.neurology.org/content/67/9_suppl_3/S2.abstract AB Many new treatments under development for Alzheimer disease (AD) will be disease-modifying rather than symptomatic. Clinical evaluation of these treatments will require primary and secondary prevention trials. We describe some of the methodologic challenges in designing primary prevention trials for AD and illustrate these with examples from the ADAPT (Alzheimer Disease Anti-Inflammatory Prevention Trial) Study and GEM (Ginkgo in Evaluation of Memory) Study. Primary prevention trials for AD present many design challenges. In most situations, secondary prevention trials provide the most feasible first step toward primary prevention.