NRGN and Alzheimer disease: Significantly positive correlations were observed in the whole study group (AD + MCI + CTRL) between CSF Ng and VILIP-1 (rho = 0.646, p < 0.001), age (rho = 0.340, p = 0.004), Tau (rho = 0.728, p < 0.001), and pTau181 (rho = 0.749, p < 0.001) and negative with MMSE (rho = −0.438, p < 0.001) and the Aβ42/40 ratio (rho = −0.365, p < 0.01).