Returning research results that indicate risk of Alzheimer disease (AD) dementia—a disease for which no meaningful treatments or cure exist—to cognitively normal participants is controversial. AD is thought to begin many years before clinical signs and symptoms begin. During this time, individuals are cognitively normal but have biomarkers that indicate pathophysiological changes in the brain. With this study, we aim to evaluate the impact of returning research results on cognitively normal participants recruited from a longitudinal observational cohort on ageing at the Knight Alzheimer Disease Research Centre (Knight ADRC) at Washington University in St. Louis.

Our study uses a 2-year, delayed-start randomised clinical trial design. Participants are randomised to receive their research results either 2 weeks or 1 year after informed consent. This study was approved to recruit up to 450 participants with existing genetic and biomarker testing results from the Knight ADRC. During the study period, 260 individuals were eligible and approached for entry into the study. The primary cognitive outcomes are 1-year change in subjective cognitive score on the clinical dementia rating sum of box scores and the objective cognitive score on cognitive composite score. The primary psychosocial outcome is change in geriatric depression scale score 1 year after return of research results. The study was powered to answer primary outcomes with 140 participants (70 per study arm).

This study has been approved by the Washington University School of Medicine (WUSM) Institutional Review Board and the Human Research Protection Office. Results from these trials are shared through conferences and publications.

NCT04699786.