Amyloid-related imaging abnormalities associated with immunotherapy in Alzheimer's disease patients

Francesco Panza, Vincenza Frisardi, Bruno P. Imbimbo, Giancarlo Logroscino, Davide Seripa, Alberto Pilotto, Vincenzo Solfrizzi

Research output: Contribution to journalArticlepeer-review

Abstract

Amyloid-related imaging abnormalities (ARIAs) have been reported in patients with Alzheimer's disease treated with bapineuzumab, a monoclonal antibody targeting β-amyloid (Aβ). The spectrum of ARIA includes signal hyperintensities on fluid attenuation inversion recovery sequences thought to represent 'vasogenic edema' and/or sulcal effusion (ARIA-E), as well as signal hypointensities on gradient echo/T 2* thought to represent hemosiderin deposits. This study was a retrospective analysis in which two neuroradiologists independently reviewed 2572 fluid attenuation inversion recovery MRI scans from 262 participants in two Phase II studies of bapineuzumab and an open-label extension study. In this analysis, several ARIA-E cases were identified that were initially missed in the reported studies of bapineuzumab (42%). Associated clinical symptoms were observed in only 22% of patients with ARIA-E. Occurrence of ARIA-E increased with bapineuzumab dose and presence of apolipoprotein E (APOE) ε4 alleles. The increased risk of ARIA-E in APOE ε4 carriers and the knowledge that vasogenic edema and microhemorrhages may spontaneously occur in cerebral amyloid angiopathy suggest a potential relationship with vascular Aβ burden. The increased risk of ARIA with a high bapineuzumab dose and the findings from a case with PET amyloid imaging also suggest a possible relationship between ARIA-E with Aβ clearance after passive immunotherapy with monoclonal antibodies.

Original languageEnglish
Pages (from-to)395-401
Number of pages7
JournalFuture Neurology
Volume7
Issue number4
DOIs
Publication statusPublished - Jul 2012

Keywords

  • Alzheimer's disease
  • amyloid-β
  • amyloid-related imaging abnormalities
  • bapineuzumab
  • passive immunotherapy

ASJC Scopus subject areas

  • Neurology
  • Clinical Neurology

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