MAPT and Alzheimer disease: Plasma levels of p‐tau217 have been shown to have a strong association with tau pathology in the brain, particularly in the presence of Aβ plaques in post mortem tissue,98 a finding that is in line with imaging studies that have demonstrated strong correlations between plasma p‐tau217 and tau‐PET scans in individuals with AD but not in those with non‐AD tauopathies.96