Mean values of the DAT*MIBG index (described in the “Materials and methods” section) were significantly lower in patients with DLB than in those with AD (15.3 ± 4.5 vs 4.6 ± 3.0, cutoff 10.18, p < 0.0001, Fig. 1, right). This evidence concerns the gene SLC6A3 and Lewy body dementia.