Associations between CSF and plasma levels of both P‐tau217 and P‐tau181 have been reported, indicating that increased phosphorylation of tau in the AD brain leads to changes in P‐tau levels in blood as well as in CSF.13, 14, 18 In line with these data, we observed significant correlations between plasma and CSF P‐tau biomarkers in DLB and PDD patients. Here, MAPT is linked to Alzheimer disease.