APOEand Cerebral Small Vessel Disease Markers in Patients With Intracerebral Hemorrhage

Abstract

Background and ObjectiveWe investigated the associations between theAPOEgenotype, intracerebral hemorrhage (ICH), and neuroimaging markers of cerebral amyloid angiopathy (CAA).MethodsWe included patients from a prospective, multicenter UK observational cohort study of patients with ICH and representative UK population controls. First, we assessed the association of theAPOEgenotype with ICH (compared with controls without ICH). Second, among patients with ICH, we assessed the association ofAPOEstatus with the hematoma location (lobar or deep) and brain CT markers of CAA (finger-like projections [FLP] and subarachnoid extension [SAE]).ResultsWe included 907 patients with ICH and 2,636 controls. The mean age was 73.2 (12.4 SD) years for ICH cases vs 69.6 (0.2 SD) for population controls; 50.3% of cases and 42.1% of controls were female. Compared with controls, anyAPOEε2 allele was associated with all ICH (lobar and nonlobar) and lobar ICH on its own in the dominant model (OR 1.38, 95% CI 1.13–1.7,p= 0.002 and OR 1.50, 95% CI 1.1–2.04,p= 0.01, respectively) but not deep ICH in an age-adjusted analyses (OR 1.26, 95% CI 0.97–1.63,p= 0.08). In the cases-only analysis, theAPOEε4 allele was associated with lobar compared with deep ICH in an age-adjusted analyses (OR 1.56, 95% CI 1.1–2.2,p= 0.01). When assessing CAA markers,APOEalleles were independently associated with FLP (ε4: OR 1.74, 95% CI 1.04–2.93,p= 0.04 and ε2/ε4: 2.56, 95% CI 0.99–6.61,p= 0.05). We did not find an association betweenAPOEalleles and SAE.DiscussionWe confirmed associations betweenAPOEalleles and ICH including lobar ICH. Our analysis shows selective associations betweenAPOEε2 and ε4 alleles with FLP, a CT marker of CAA. Our findings suggest that differentAPOEalleles might have diverging influences on individual neuroimaging biomarkers of CAA-associated ICH.