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From the London MS Clinic (Drs. Rice and Ebers, and J. Lesaux), London, Ontario; and the UBC MS Clinic (Drs. Oger and Paty, and B. Paszner), Vancouver, Canada.
Address correspondence and reprint requests to Dr. Rice, The London MS Clinic, LHSC-UC, 339 Windermere Road, London, Ontario, Canada N6A 5A5.
The fate of the neutralizing antibody (NAB) in MS patients treated with interferons remains unclear. We conducted a follow-up survey of NAB titers in 59 long-term treated patients from the London and Vancouver cohorts of the pivotal trial of interferon ß-1b. NAB were measured with the myxovirus protein A assay and an ELISA, at a mean follow-up that exceeded 8 years. NAB disappeared in the majority of patients.
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