Therefore, this study aimed to evaluate whether the levels of blood miRNAs (1) predict the P-tau/Aβ42 ratio in the CSF, (2) can be used to differentiate patients with AD from cognitively normal controls, and (3) can effectively discriminate AD from VaD, PDD, bvFTD, and DLB. Here, MAPT is linked to Lewy body dementia.