Researchers at the University of Cincinnati have published data showing that in patients with dominantly inherited Alzheimer’s disease (AD)-causing mutations, high levels of soluble amyloid-β42 (Aβ42) in the cerebrospinal fluid (CSF) predicted a reduced risk of developing dementia over 3 years. Their work, which appeared in the Oct. 4, 2022, print issue of the Journal of Alzheimer’s Disease after earlier publication online, suggests that the problem with amyloid in AD may be a lack of soluble amyloid-β, rather than a surfeit of plaques.