NEFL and Alzheimer disease: No statistically significant correlations were found between plasma NfL levels and Aβ42 (P = 0.31, r = 0.17; P = 0.45, r = 0.13; P = 0.64, r = 0.07; P > 0.99, r = 0.00), p-tau (P = 0.07, r = 0.30; P = 0.10, r = −0.27; P = 0.47, r = −0.11; P > 0.99, r = 0.00), and tau (P = 0.40, r = −0.14; P = 0.19, r = −0.22; P = 0.052, r = −0.30; P > 0.99, r = 0.00) for AD, MCI, non-AD, and HC respectively.