Cited by 1,367Alzheimer's disease research and treatmentsDementia and Cognitive Impairment ResearchNeuroinflammation and Neurodegeneration Mechanisms

Two Randomized Phase 3 Studies of Aducanumab in Early Alzheimer's Disease

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Budd Haeberlein, Samantha, Aisen, P.S., Barkhof, F., Chalkias, S., Chen, T., Cohen, S., Dent, G., Hansson, O. +16 more·2022·The Journal of Prevention of Alzheimer's Disease

Abstract

BACKGROUND: Alzheimer's disease is a progressive, irreversible, and fatal disease for which accumulation of amyloid beta is thought to play a key role in pathogenesis. Aducanumab is a human monoclonal antibody directed against aggregated soluble and insoluble forms of amyloid beta. OBJECTIVES: We evaluated the efficacy and safety of aducanumab in early Alzheimer's disease. DESIGN: EMERGE and ENGAGE were two randomized, double-blind, placebo-controlled, global, phase 3 studies of aducanumab in patients with early Alzheimer's disease. SETTING: These studies involved 348 sites in 20 countries. PARTICIPANTS: Participants included 1638 (EMERGE) and 1647 (ENGAGE) patients (aged 50-85 years, confirmed amyloid pathology) who met clinical criteria for mild cognitive impairment due to Alzheimer's disease or mild Alzheimer's disease dementia, of which 1812 (55.2%) completed the study. INTERVENTION: Participants were randomly assigned 1:1:1 to receive aducanumab low dose (3 or 6 mg/kg target dose), high dose (10 mg/kg target dose), or placebo via IV infusion once every 4 weeks over 76 weeks. MEASUREMENTS: The primary outcome measure was change from baseline to week 78 on the Clinical Dementia Rating Sum of Boxes (CDR-SB), an integrated scale that assesses both function and cognition. Other measures included safety assessments; secondary and tertiary clinical outcomes that assessed cognition, function, and behavior; and biomarker endpoints. RESULTS: EMERGE and ENGAGE were halted based on futility analysis of data pooled from the first approximately 50% of enrolled patients; subsequent efficacy analyses included data from a larger data set collected up to futility declaration and followed prespecified statistical analyses. The primary endpoint was met in EMERGE (difference of -0.39 for high-dose aducanumab vs placebo [95% CI, -0.69 to -0.09; P=.012; 22% decrease]) but not in ENGAGE (difference of 0.03, [95% CI, -0.26 to 0.33; P=.833; 2% increase]). Results of biomarker substudies confirmed target engagement and dose-dependent reduction in markers of Alzheimer's disease pathophysiology. The most common adverse event was amyloid-related imaging abnormalities-edema. CONCLUSIONS: Data from EMERGE demonstrated a statistically significant change across all four primary and secondary clinical endpoints. ENGAGE did not meet its primary or secondary endpoints. A dose- and time-dependent reduction in pathophysiological markers of Alzheimer's disease was observed in both trials.

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  • About 40% of patients treated with aducanumab experienced life-threatening side effects, including cerebral edemas (ARIA-E) and hemorrhages (ARIA-H).

    “about 40% of patients treated with the mab aducanumab experienced life-threatening side effects, including cerebral edemas (ARIA-E) and hemorrhages (ARIA-H)”

    From Perineuronal net deglycosylation associates with tauopathy‐induced gliosis and neurodegeneration (2024) · cites this paper as Budd Haeberlein et al. 2022

    The Safety section identifies ARIA-E and ARIA-H as adverse events, but it does not characterize roughly 40% of treated patients as having life-threatening effects. It reports serious ARIA events in only 1.5% and 1.4% of the high-dose groups, says a minority of participants with ARIA had symptoms, and reports no fatal ARIA events. (LLM, conf=0.88)

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  • Anti-amyloid antibodies can clear Aβ plaques from the brain, leading to a slowing of cognitive and functional decline in individuals with MCI and mild dementia due to AD.

    “Several phase 3 trials demonstrated that anti-amyloid antibodies can clear Aβ plaques from the brain6–8, which leads to a slowing of cognitive and functional decline in individuals with mild cognitive impairment (MCI) and mild dementia due to AD.”

    From Highly accurate blood test for Alzheimer's disease is similar or superior to clinical cerebrospinal fluid tests (2024) · cites this paper as [6]

    The Efficacy section reports dose- and time-dependent reductions in brain amyloid PET measures in both phase 3 trials, which enrolled people with MCI or mild dementia due to AD. The Discussion reports slower clinical decline in EMERGE but says ENGAGE did not meet its clinical endpoints; it describes plaque removal as possibly associated with clinical benefit, not as establishing that plaque clearance leads to slower decline. (LLM, conf=0.88)

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  • Anti-Aβ immunotherapies have shown reductions in amyloid PET, and several amyloid reducing therapies for AD use amyloid PET (or CSF) as a key endpoint.

    “Anti-Aβ immunotherapies have shown reductions in amyloid PET and several amyloid reducing therapies for AD use amyloid PET (or CSF) as a key endpoint [172, 173].”

    From The use of neuroimaging techniques in the early and differential diagnosis of dementia (2023) · cites this paper as [172]

    The Efficacy section reports dose- and time-dependent reductions in amyloid PET signal with aducanumab in both EMERGE and ENGAGE. The Statistical analyses section says amyloid PET was the only biomarker outcome with a sample-size calculation, but all biomarker analyses were exploratory. This paper does not establish that several different amyloid-reducing therapies use PET or CSF as key endpoints. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • Anti-amyloid monoclonal antibodies aducanumab, lecanemab, and donanemab have demonstrated robust amyloid clearance with statistically significant but modest clinical effects.

    “Three anti-amyloid monoclonal antibodies aducanumab, lecanemab, and donanemab have demonstrated robust amyloid clearance, with statistically significant but modest clinical effects”

    From Is there a role for B cells in Alzheimer's disease? (2026) · cites this paper as [10]

    The Efficacy section reports substantial amyloid PET reductions with aducanumab, and the Discussion reports statistically significant slowing of clinical decline in the high-dose EMERGE arm. But the Discussion also says ENGAGE did not meet its clinical endpoints. The Introduction describes robust amyloid reduction with newer anti-amyloid antibodies, but this paper does not establish statistically significant clinical effects for lecanemab and donanemab. (LLM, conf=0.88)

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  • Phase 2 and phase 3 trials of aducanumab, lecanemab, donanemab, and gantenerumab targeting Aβ required PET or CSF evidence of amyloid pathology for trial enrolment.

    “Phase 2 and phase 3 trials of the monoclonal antibodies -- aducanumab, lecanemab, and donanemab, as well as the discontinued gantenerumab -that target Aβ plaques, fibrils, soluble protofibrils, and oligomeric Aβ species all required PET or CSF evidence of amyloid pathology for trial enrolment. (460-463)”

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Authors
Budd Haeberlein, S., Aisen, P. S., Barkhof, F., Chalkias, S., Chen, T., Cohen, S., Dent, G., Hansson, O., Harrison, K., von Hehn, C., Iwatsubo, T., Mallinckrodt, C., Mummery, C. J., Muralidharan, K. K., Nestorov, I., Nisenbaum, L., Rajagovindan, R., Skordos, L., Tian, Y., van Dyck, C. H., Vellas, B., Wu, S., Zhu, Y., & Sandrock, A.
Affiliations
  • University of Southern California (US)
  • Amsterdam University Medical Centers (NL)
  • Biogen (United States) (US)
  • Lund University (SE)
  • The University of Tokyo (JP)
  • UCL Queen Square Institute of Neurology (GB)
  • Université Toulouse III - Paul Sabatier (FR)
Venue
The Journal of Prevention of Alzheimer's Disease
Publisher
Elsevier BV
Published
2022-04
Volume
9
Issue
2
Pages
197-210
ISSN
2274-5807 (ISSN-L)
OpenAlex
W4225741213
Cited by
1,367
References
9
Citations by year
2026: 238 · 2025: 395 · 2024: 393 · 2023: 276 · 2022: 64 · 2012: 1
FWCI
174.63
Type
journal article
Language
en
Open access
Locations
  • The Journal of Prevention of Alzheimer s Disease (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Amsterdam UMC (VU Amsterdam) - Institutional Repository (publishedVersion, other-oa)
  • Pure Amsterdam UMC (acceptedVersion, cc-by)
  • UCL Discovery (University College London) (submittedVersion)
  • Lund University Publications (Lund University) (submittedVersion)
  • Data Archiving and Networked Services (DANS) (submittedVersion, other-oa)
Funders
  • Foundation for the National Institutes of Health
  • Alzheimer's Association
  • Eli Lilly and Company
  • Pfizer
  • Biogen
  • Moderna
  • National Institute for Health and Care Research
  • Eisai
  • Université de Toulouse
  • University College London Hospitals NHS Foundation Trust
  • IXICO
  • National Institutes of Health
  • Genentech
  • Avid Radiopharmaceuticals
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
aducanumab, Alzheimer's disease, early Alzheimer's disease, amyloid-beta, anti-amyloid monoclonal antibodies, mild cognitive impairment, mild dementia, CDR-SB, amyloid-related imaging abnormalities, target engagement, amyloid PET, futility analysis, drug safety, dose-response relationship, disease biomarkers
MeSH terms
Alzheimer Disease, Humans, Biomarkers, Amyloid beta-Peptides, Antibodies, Monoclonal, Humanized

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