In the whole study group (AD + MCI + CTRL) significant positive correlations between CSF levels of FABP3 and age (rho = 0.332, p = 0.002), Tau (rho = 0.723, p < 0.001), pTau181 (rho = 0.693, p < 0.001) and negative with: MMSE (rho = −0.585, p < 0.001), Aβ42/40 ratio (rho = −0.488, p < 0.001), ApoE4 (rho = 0.318, p = 0.007) (Figure 2a) were observed. This evidence concerns the gene APOE and Alzheimer disease.