NEFL and Alzheimer disease: Regarding the correlations between plasma NfL levels and CSF biomarkers, we found that NfL inversely correlated with Aβ1–42 and Aβ1–42/1–40 ratio and directly correlated with p-tau and t-tau in the MCI group, These results confirm the previous data [24] and may support the use of plasma NfL as a biomarker of AD-related biological changes in prodromal AD.