MAPT and early-onset autosomal dominant Alzheimer disease: To understand their relationship to the distribution and progression of Alzheimer's disease neuropathologic change (ADNC), we analysed associations between biochemical markers and mediators of cerebral hypoperfusion and BBB leakiness, and amyloid-β (Aβ) and hyperphosphorylated tau, in multiple brain regions at different Braak tangle stages (BS).