BDNF and Stroke: Serum levels of neuronal specific enolase (NSE), neurofilament light chain (NfL), brain derived neurotrophic factor (BDNF), amyloid-β42 and β40 peptides (Aβ42/Aβ40 ratio) and total tau (t-tau), were measured in 20 patients within one month after stroke event (baseline, T0).