A prospective harmonized multicenter DTI study of cerebral white matter degeneration in ALS

Neurology. 2020 Aug 25;95(8):e943-e952. doi: 10.1212/WNL.0000000000010235. Epub 2020 Jul 9.

Abstract

Objective: To evaluate progressive white matter (WM) degeneration in amyotrophic lateral sclerosis (ALS).

Methods: Sixty-six patients with ALS and 43 healthy controls were enrolled in a prospective, longitudinal, multicenter study in the Canadian ALS Neuroimaging Consortium (CALSNIC). Participants underwent a harmonized neuroimaging protocol across 4 centers that included diffusion tensor imaging (DTI) for assessment of WM integrity. Three visits were accompanied by clinical assessments of disability (ALS Functional Rating Scale-Revised [ALSFRS-R]) and upper motor neuron (UMN) function. Voxel-wise whole-brain and quantitative tract-wise DTI assessments were done at baseline and longitudinally. Correction for site variance incorporated data from healthy controls and from healthy volunteers who underwent the DTI protocol at each center.

Results: Patients with ALS had a mean progressive decline in fractional anisotropy (FA) of the corticospinal tract (CST) and frontal lobes. Tract-wise analysis revealed reduced FA in the CST, corticopontine/corticorubral tract, and corticostriatal tract. CST FA correlated with UMN function, and frontal lobe FA correlated with the ALSFRS-R score. A progressive decline in CST FA correlated with a decline in the ALSFRS-R score and worsening UMN signs. Patients with fast vs slow progression had a greater reduction in FA of the CST and upper frontal lobe.

Conclusions: Progressive WM degeneration in ALS is most prominent in the CST and frontal lobes and, to a lesser degree, in the corticopontine/corticorubral tracts and corticostriatal pathways. With the use of a harmonized imaging protocol and incorporation of analytic methods to address site-related variances, this study is an important milestone toward developing DTI biomarkers for cerebral degeneration in ALS.

Clinicaltrialsgov identifier: NCT02405182.

Publication types

  • Multicenter Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Amyotrophic Lateral Sclerosis / diagnostic imaging*
  • Amyotrophic Lateral Sclerosis / pathology
  • Cerebral Cortex / diagnostic imaging*
  • Cerebral Cortex / pathology
  • Diffusion Tensor Imaging
  • Disease Progression
  • Female
  • Humans
  • Image Interpretation, Computer-Assisted / methods
  • Longitudinal Studies
  • Male
  • Middle Aged
  • Nerve Degeneration / diagnostic imaging
  • Nerve Degeneration / pathology
  • Neuroimaging / methods
  • Prospective Studies
  • Pyramidal Tracts / diagnostic imaging*
  • Pyramidal Tracts / pathology
  • White Matter / diagnostic imaging*
  • White Matter / pathology

Associated data

  • ClinicalTrials.gov/NCT02405182

Grant support