Furthermore, SAA correlated with YKL-40, IL-6 and IL-8 in the cohort as a whole (p ≤ 0.026, β ≥ 0.139) but in the PD group SAA only correlated with IL-8 (p = 0.002, β = 0.259). This evidence concerns the gene CXCL8 and Parkinson disease.