According to a previous study, PD and Parkinson-plus syndrome showed different subregional patterns of striatal DAT loss in 18F-N-(3-fluoropropyl)-2β-carboxymethoxy-3β-(4-iodophenyl) nortropane (FP-CIT) positron emission tomography (PET) images. This evidence concerns the gene SLC6A3 and Parkinson disease.