Furthermore, Spearman analyses uncovered significant positive correlations between the concentration of tau fibrils and MPO in the putamen of the AD patients with the TSPO (rs6971) AG genotype (rs = 0.700, p = 0.036) and the caudate of PD patients with the BIN1 (rs7561528) AG genotype (rs = 0.900, p = 0.037). This evidence concerns the gene TSPO and Alzheimer disease.