NEFL and Alzheimer disease: A recent study that included 20 AD patients, 10 HC, and 10 patients with cerebral amyloid angiopathy (CAA) observed a negative correlation between CSF Fe levels and CSF Aβ1–42 levels (with Ni, Cr, Zn, Mn, Co, Cu, Aβ1–40, t-tau, p-tau181, and NFL being also measured in CSF) [27].