LRRK2 and Parkinson disease: We analyzed the correlations of α-syn in urine between the urinary oxidized DJ-1 (OxiDJ-1) which was reported as a feasible marker of PD in our previous study (Jang et al. 2018), and urinary LRRK2 levels which were reported as a potential marker of PD in previous studies (Fraser, Moehle, et al. 2016; Fraser, Rawlins, et al. 2016).