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Drug Development.

Janice Smith1, Catherine J Mummery2, Jeffrey L Cummings3

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|December 26, 2025
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Summary
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Trontinemab, an amyloid-targeting antibody, rapidly reduced amyloid plaques in early Alzheimer's disease (AD) with a low incidence of side effects. Pivotal Phase III trials will further assess its efficacy in slowing disease progression.

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Area of Science:

  • Neuroscience
  • Immunology
  • Pharmacology

Background:

  • Developing therapies to reduce amyloid plaques is a key strategy for treating early symptomatic Alzheimer's disease (AD).
  • Trontinemab is a novel antibody engineered for enhanced blood-brain barrier penetration via transferrin receptor 1.
  • Phase Ib/IIa studies showed trontinemab achieved significant amyloid plaque reduction with a low rate of amyloid-related imaging abnormalities (ARIA).

Purpose of the Study:

  • To investigate the efficacy, safety, tolerability, pharmacokinetics (PK), and pharmacodynamics of trontinemab in early AD.
  • To assess the potential of trontinemab to slow disease progression in individuals with early symptomatic AD.

Main Methods:

  • TRONTIER 1 and 2 are global, randomized, double-blind, placebo-controlled Phase III studies.
  • Participants with early AD and confirmed amyloid pathology will receive intravenous trontinemab.
  • A pre-screener study (Traveller) will utilize clinical assessment and plasma biomarkers to broaden trial access.

Main Results:

  • The primary endpoint is the change in Clinical Dementia Rating-Sum of Boxes at 18 months.
  • Secondary outcomes include assessments of cognition, function, behavior, and quality of life.
  • Pharmacodynamic effects will be evaluated using PET imaging and fluid biomarkers; safety, PK, and immunogenicity will also be assessed.

Conclusions:

  • Interim Phase Ib/IIa results indicate rapid amyloid plaque clearance and biomarker changes with low ARIA incidence.
  • Favorable safety and biomarker data support the initiation of Phase III TRONTIER studies.
  • Phase III studies aim to determine if trontinemab treatment slows disease progression in early symptomatic AD.