Genome-wide association studies (GWAS) identified variants in the GBA, SNCA, APOE, and MAPT loci influencing the individual risk for DLB, suggesting that it has shared genetic risk features with PD and AD [32, 155], while the APOE4 haplotype may be an indication of PDD [156]. The gene discussed is APOE; the disease is Lewy body dementia.