NRGN and Alzheimer disease: In the AD group, the CSF levels of Ng significantly correlated with the concentration of VILIP-1 (rho = 0.646, p < 0.001), age (rho = 0.340, p = 0.004), Tau (rho = 0.728, p < 0.001), pTau181 (rho = 0.749, p < 0.001), and NPTXR (rho = −0.181, p = 0.040).