Concentrations of MIF (p=0.002), MMP-1 (p=0.005), CD30 (p=0.030), Tweak (p=0.040), and SDF-1 alpha (p=0.042) were lower in PD (n=58) a compared to control subjects (n=71) (Figure 5C&D). Here, MMP1 is linked to Parkinson disease.