| Recruiting | N/A | 450 | Europe, US | Flutafuranol, [18F]NAV4694, NAV4694, Pittsburgh Compound (PIB), [11C]-PIB, PIB, MK6240, [18F]MK-6240 | University of Southern California, National Institute on Aging (NIA), Alzheimer's Clinical Trials Consortium, Alzheimer's Therapeutic Research Institute | Down Syndrome, Alzheimer Disease, Dementia | 12/25 | 12/25 | | |