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Intrathecal oligoclonal IgG synthesis in multiple sclerosis
1Department of Neurology, VU University Medical Center, Amsterdam, The Netherlands; UCL Institute of Neurology, Neuroimmunology & CSF Laboratory, Queen Square, London, United Kingdom.
Journal of Neuroimmunology
|July 30, 2013
Summary
Cerebrospinal fluid (CSF) oligoclonal bands (OCBs) were previously used to diagnose multiple sclerosis. However, their diagnostic specificity significantly decreases when other inflammatory conditions are considered.
Area of Science:
- Neurology
- Clinical Diagnostics
- Biomarker Analysis
Background:
- Diagnosis of multiple sclerosis (MS) relies on demonstrating dissemination in time and space.
- Before 2010, cerebrospinal fluid (CSF) oligoclonal bands (OCBs) could substitute for evidence of dissemination in space.
- This practice highlights a conceptual challenge in using biomarkers for diagnostic criteria.
Purpose of the Study:
- To evaluate the diagnostic specificity of CSF OCBs in the context of various etiologies.
- To assess the reliability of OCBs as a surrogate marker for dissemination in space in MS diagnosis.
Main Methods:
- A meta-analysis of 13,467 patients was conducted.
- Diagnostic specificity of OCBs was analyzed, considering patients with and without other inflammatory conditions.
- Literature review on CSF OCBs and their role in MS diagnosis.
Main Results:
- The diagnostic specificity of OCBs dropped from 94% to 61% when inflammatory etiologies were included.
- This reduction in specificity was not attributed to suboptimal laboratory practices.
- The findings indicate a conceptual issue with using OCBs to replace spatial dissemination evidence.
Conclusions:
- CSF OCBs have reduced diagnostic specificity when other inflammatory conditions are present.
- Relying solely on OCBs as a proxy for dissemination in space presents diagnostic limitations.
- Prospective studies are needed to determine the prognostic value of intrathecal OCBs.
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