Therefore, some of these cases may include PSP, CBD, and FTD with parkinsonism linked to chromosome-17 (FTDP-17), which have similar clinical features (Park and Chung, 2013; Shinagawa et al., 2014) and are likely to have reduced DAT (Park and Chung, 2013; Brooks, 2016; Takeshige et al., 2018; Wu et al., 2018). This evidence concerns the gene SLC6A3 and Parkinson disease.