MAPT and Lewy body dementia: Reactive microglial load (HLA-DR-positive) correlated negatively with Aβ load in pure AD, pure DLB and mixed DLB + AD (r = -0.13, p = 0.033; r = -0.16, p = 0.048; r = -0.15, p < 0.001) and positively with p-tau load in pure AD, pure DLB and mixed DLB + AD (r = 0.24, r = 0.28 and r = 0.12, p < 0.001).