APOE and Alzheimer disease: The regression analyses adjusted by age, sex, and presence of the ε4 allele of the ApoE gene confirmed in AD patients the association between plasma sTREM2 levels and CSF levels (B = 0.411; 95% CI, 0.137–0.685; p = 0.004), as well as Aβ1−42 concentrations (B = 0.035; 95% CI, 0.007–0.063; p = 0.01).