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Defining high, medium and low impact prognostic factors for developing multiple sclerosis.

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Summary

Predicting multiple sclerosis (MS) development and disability is improved by considering baseline factors. The number of brain lesions on MRI is a high-impact predictor, while oligoclonal bands have a medium impact.

Keywords:
clinically isolated syndromesdemyelinationepidemiologyimagingmultiple sclerosis

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Area of Science:

  • Neurology
  • Neuroimmunology
  • Clinical Research

Background:

  • Natural history studies identify factors predicting multiple sclerosis (MS) evolution and disability accumulation.
  • Previous studies had limitations including lack of standardized protocols and systematic magnetic resonance imaging (MRI) analysis.
  • Failure to account for MRI findings and oligoclonal bands as joint covariates limited predictive accuracy.

Purpose of the Study:

  • To identify and stratify baseline demographic, clinical, radiological, and biological characteristics for predicting MS development.
  • To predict disability accumulation in patients with clinically isolated syndromes using a multivariate approach.
  • To overcome limitations of previous studies by incorporating a systematic analysis of prognostic factors.

Main Methods:

  • A prospective cohort of 1058 patients with clinically isolated syndromes (1995-2013) was analyzed.
  • Cox regression models (univariate and multivariate) evaluated prognostic factors for conversion to clinically definite MS, McDonald MS, and disability.
  • 1015 patients were followed for a mean of 81 months, assessing Expanded Disability Status Scale (EDSS) scores.

Main Results:

  • Female/male ratio was 2.1; females showed similar MS conversion and disability risk compared to males.
  • Younger age at onset increased MS conversion risk but had a protective effect on disability.
  • Optic neuritis showed a trend towards lower MS and disability risk. Oligoclonal bands increased MS and disability risk. 10+ brain lesions significantly increased MS and disability risk. Early disease-modifying treatment reduced MS and disability progression risk.

Conclusions:

  • Demographic and topographic factors have low prognostic impact for MS.
  • Oligoclonal bands represent a medium-impact prognostic factor for MS development and disability.
  • The number of brain lesions on MRI is a high-impact prognostic factor for MS and disability accumulation.