IL17A and Brain atrophy: Five factors were significantly associated with central degeneration, including IL-2, IL-12p70, IL-17A, sCD30/TNFRSF8, and tumour necrosis factor (TNF)-α; the association between inflammation and brain atrophy was mainly distributed in frontal–limbic–striatal brain regions, whereas the association with brain metabolism was mainly in the frontal–temporal–limbic–striatal regions.