NEFL and Alzheimer disease: The main findings were as follows: (1) very strong diagnostic performance of plasma p‐tau217 to distinguish AD from bvFTD, and AD from PPDs; (2) superior performance of p‐tau217 for AD diagnosis on its own, compared to NfL/p‐tau217 ratio, NfL, and GFAP; (3) strongest performance of NfL for distinguishing bvFTD from PPDs, and all NDs from PPDs, consistent with previous studies.30, 31