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We investigated whether cerebrospinal fluid (CSF) analysis may differentiate between relapsing-remitting (RR) and secondary progressive (SP) multiple sclerosis (MS). In 17 RR and 16 SP patients we determined: albumine CSF/PB ratio; mononuclear cell (MNC) number, CD4+, CD8+, and B1+ subsets, CD4+/CD8+ ratio; IgG, IgG index, IgM, IgM index, complement components C3 and C4, and C3 and C4 indexes; myelin basic protein; neuron-specific enolase (NSE); S100; and lactate. For each parameter the statistical distance was calculated. Then, using linear discriminant analysis, we computed a discriminant score, including only variables with a P value less than or equal to 0.15: albumin CSF/PB ratio, MNC number, IgM, IgM index, C3, C4, NSE, S100, and lactate. The discriminant score allocated all 17 RR patients to the RR group and 15 of 16 SP patients to the SP group. We conclude that RR and SP MS patients differ with respect to CSF profile and that in individual patients a composite CSF score may differentiate between RR and SP MS.
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