p-tau correlated with CSF Ng in CTRL (rhos = 0.39), MCI (rhos = 0.60), and ADD (rhos = 0.56) (p < 0.001 for all groups) as well in PD MCI (rhos = 0.52, p < 0.05), DLB (rhos = 0.56, p < 0.01), and bvFTD (rhos = 0.49, p < 0.01) but not in the other diagnoses (Table 2). Here, NRGN is linked to Parkinson disease.