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Advanced MRI techniques precisely track Corticobasal Degeneration (CBD) progression and differentiate it from other disorders. This accelerates clinical trials for rare neurodegenerative diseases by reducing sample size requirements.

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Area of Science:

  • Neuroimaging
  • Neurology
  • Biomarkers

Background:

  • Corticobasal Degeneration (CBD) is a rare neurodegenerative disorder characterized by tau protein accumulation and neuronal loss.
  • CBD shares clinical symptoms with other Parkinsonian syndromes, posing diagnostic challenges.
  • MRI biomarkers, including volumetric and diffusion MRI (dMRI), are crucial for disease progression monitoring and clinical trial enhancement.

Purpose of the Study:

  • To explore the progression of CBD using advanced imaging techniques.
  • To differentiate CBD from similar neurodegenerative disorders like Progressive Supranuclear Palsy (PSP).
  • To assess the utility of MRI biomarkers in reducing sample size requirements for clinical trials.

Main Methods:

  • Utilized MRI data from CBD, PSP, and healthy control cohorts from the 4RTNI and FTLDNI studies.
  • Employed the PIANO™ software platform for automated gray matter density and regional volume analysis.
  • Analyzed dMRI metrics, including radial diffusivity (RD) and free water (FW), to detect microstructural changes.
  • Conducted sample size calculations to determine participant numbers needed for clinical trials.

Main Results:

  • CBD subjects exhibited rapid brain atrophy, with significant gray matter density decreases in sensorimotor, parietal, and temporal cortices over 12 months.
  • Volumetric analysis showed 2.5%-5% regional reductions and subcortical atrophy in the thalamus and hippocampus.
  • dMRI revealed up to 5% change in regional mean diffusivity in white matter and cortical areas over 12 months.
  • The PIANO™ platform significantly reduced sample size requirements compared to FreeSurfer, needing 30-44 subjects per arm for clinical trials.

Conclusions:

  • Advanced MRI, combining volumetric and diffusion analyses, accurately tracks CBD progression and distinguishes it from PSP.
  • This approach can accelerate clinical trials for rare neurodegenerative diseases by minimizing sample size and enabling early therapy evaluation.
  • Integrating robust imaging biomarkers is vital for improving diagnostic accuracy and therapeutic interventions in conditions like CBD.