TSPO and Alzheimer disease: In comparison with controls, lower levels of striatal TSPO binding were obtained in the caudate (PD: −75.7%, PDD: −63.1%, DLB: −69.2%) and putamen (PD: −67.4%, PDD: −57.5%, DLB: −68.9%) samples of LBDs, as shown in Figure 4a, statistically significant results were obtained for the LBDs when compared with AD cases.