In the total cohort with PD, DAT levels in the caudate and putamen exhibited a significant negative spearman correlation with the NLR (ρ = −0.29, p = 0.003 and ρ = −0.28, p = 0.004, respectively), as well as a positive correlation with the lymphocyte count (ρ = 0.25, p = 0.013 and ρ = 0.22, p = 0.026, respectively). Here, SLC6A3 is linked to Parkinson disease.