SLC6A3 and Parkinson disease: At baseline the UPDRS-III score and the DAT uptake were significantly correlated in PD patients (Pearson's correlation coefficients for contralateral caudate: −0.390,  P < 0.05 and striate: −0.397, P < 0.05; ipsilateral caudate: −0.447, P < 0.05, putamen: −0.390, P < 0.05, and striate: −0.449,  P < 0.05) but no significant correlation was seen in APD patients.