The results showed that there were no significant differences in the area under the curve (AUC) of proBDNF, mBDNF, and mBDNF/proBDNF between the ex-PD and po-PD groups (0.673 vs. 0.711, p = 0.57; 0.632 vs. 0.71, p = 0.26; 0.716 vs. 0.781, p = 0.28, respectively) (Table 3). Here, BDNF is linked to Parkinson disease.