Moreover, among PD patients increased CXCL10/IP-10 levels were associated with worse performance in cognitive tests; that is, CXCL10/IP-10 levels correlated negatively with MMSE (ρ = −0.395, P = 0.016) and FAB (ρ = −0.458, P = 0.004) scores (Figure 2). This evidence concerns the gene CXCL10 and Parkinson disease.