Notably, all of these were only found in female PD patients and were not the same as those associated with the PD-specific biomarker CSF α-synuclein (Interleukin-10, Interleukin-12p40, Interleukin-13, Interleukin-16, Interleukin-18, MCP-1, MIP-1 beta). Here, IL18 is linked to Parkinson disease.