Immunostaining(P2X7R, GFAP, amyloid-β, and phospho-tau) and autoradiography using [18F]JNJ-64413739 for P2X7R were performed in postmortem hippocampal and entorhinal cortex tissues from 42 AD patients and 35 nondemented-controls. Here, MAPT is linked to Alzheimer disease.