MAPT and Alzheimer disease: We examined 25 cases with AT8 positive tau pathology in the China Brain Bank (68% males, mean age at death 84.32 ± 9.46 years, 15 AD cases: Braak tau stages III–VI, Aβ Thal scores 1–5; and 10 PART cases: Braak stages II–IV, Aβ Thal scores 0).