The apolipoprotein E ε4 allele (APOE ε4) is associated with higher incidence of amyloid-related imaging abnormalities in patients with Alzheimer's disease undergoing anti-amyloid therapy, underscoring the importance of allele status testing. In this study, plasma ApoE4 levels were measured in 70 participants using Lumipulse®G Pan-ApoE and ApoE4 assays and compared with traditional genotyping. ApoE4 concentrations and ratio ApoE4/Pan-ApoE differed significantly across non-ε4, ε3/ε4, and ε4/ε4 groups. No correlation was observed with age, sex, creatinine levels, or AD cerebrospinal fluid biomarkers. Diagnostic performance was excellent, indicating that proteotyping of ApoE can accurately classify the main APOE haplotypes.
Puerto et al. (Mon,) studied this question.