TNF and Parkinson disease: Relative mitochondrial health was not correlated with TNF secretion (Fig. 7A), but it was positively correlated with IL-10 secretion in both prodromal PD and MPD groups (Fig. 7B) (PRO: p = 0.025, R2 = 0.331; MPD: p = 0.010, R2 = 0.228).