PDGFRB and dementia: CSF PDGFRβ showed a significant weak inverse correlation with MMSE score in the whole cohort (r = −0.164 [CI95% −0.305 to −0.024], P = 0.019, Spearman's rank test, Table 2) as well in the MCI and dementia groups (respectively, r = −0.252 [CI95% −0.468 to −0.018], P = 0.009 and r = −0.211 [CI95% −0.398 to −0.009], P = 0.036, Spearman's rank test).