MAPT and Alzheimer disease: Reactive microglial load (CD68-positive), again associated negatively with Aβ load in pure AD and mixed DLB + AD (r = -0.36 and r = -0.21, p < 0.001) and positively with p-tau load in pure AD, pure DLB, and mixed DLB + AD (r = 0.38, r = 0.30 and r = 0.28, p < 0.001).