The relationship between WCST tests and striatal DAT availability in patients with pure AD by Spearman correlation revealed that a marginal association was observed for total errors (rho = −0.407, P = 0.032), perseverative errors (rho = −0.385, P = 0.043), and categories completed (rho = 0.379, P = 0.047) (Table 4). Here, SLC6A3 is linked to Alzheimer disease.