In the PD dataset GSE49036, 12 types of immune cells, including Bi, CD56-NK, mast cells, MDSCs, neutrophils, Ba, CD8 + Tem, DCp, NKT, Tfh, macrophages, and monocytes, were found to be different between patients with PD and controls (Figure 7B). This evidence concerns the gene CD8A and Parkinson disease.