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Abstract
We used receiver operating characteristic (ROC) curve analysis to determine the relative performance of different CSF IgG parameters as diagnostic markers for multiple sclerosis. We quantitated CSF and serum IgG and albumin to determine an IgG albumin ratio, IgG index, Tourtellotte's synthesis rate, and Schuller's formula; CSF free kappa light chains were measured by radioimmunoassay. We compared a group of patients with clinically definite MS with a group of patients with a variety of other neurologic diseases. Tourtellotte's formula, IgG albumin ratio, IgG index, and free kappa chains distinguished the MS group from the comparative group of patients. ROC curve analysis demonstrated that CSF free kappa light chains were more closely linked to MS than the other measures. Multiple logistic regression analysis demonstrated no advantage of adding any single IgG measure or combination of measures to free kappa light chain analysis. Our results strongly suggest that free kappa light chains in CSF are the single best quantitative assay to support a clinical diagnosis of MS.
Published Version
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