In the AD group, the concentrations of plasma Aβ42, Aβ40, and P-Tau were 162.78 ± 29.84 pg/m, 148.74 ± 57.76 pg/ml, and 138.63 ± 33.80 pg/ml, respectively, and Aβ40/Aβ42 was 0.94 ± 0.45. Here, MAPT is linked to Alzheimer disease.