NEFL and Alzheimer disease: Besides, plasma levels of pT217 (181.54 ± 73.19 vs. 239.15 ± 120.84, p = 0.0003), pT181 (1.69 ± 0.72 vs. 2.34 ± 1.04, p < 0.0001), and NfL (657.97 ± 282.27 vs. 839.04 ± 371.09, p < 0.0001) in the AD group were elevated (Table 1 and Figure S2).