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From the Danish Multiple Sclerosis Research Center (P.S.S., T.T., M.R.), Department of Neurology, Copenhagen University Hospital Rigshospitalet, Copenhagen, Denmark; Danish Research Centre for Magnetic Resonance (H.K.M., A.R.L.), Copenhagen University Hospital Hvidovre, Denmark; and Institute for Inflammation Research (C.R., K.B.), Copenhagen University Hospital Rigshospitalet, Copenhagen, Denmark
Address correspondence and reprint requests to Dr. Per Soelberg Sorensen, Danish Multiple Sclerosis Research Center, Department of Neurology 2082, Rigshospitalet, DK-2100 Copenhagen, Denmark; e-mail: pss{at}rh.dk
We measured neutralizing antibodies (NABs) and the in vivo biologic response to interferon-ß on neopterin and ß2-microglobulin blood levels. All NAB-negative patients had an in vivo biologic response (full or partial), whereas all high-level positive patients had no response. High-level NAB patients had more MRI activity than NAB-negative patients (p = 0.031). Patients with a full response had less MRI activity than patients without biologic response (p = 0.032).
Additional material related to this article can be found on the Neurology Web site. Go to www.neurology.org and scroll down the Table of Contents for the November 14 issue to find the title link for this article.
Disclosure: Dr. Soelberg Sorensen has received honoraria for lecturing, advisory councils, and expert testimony and financial support for his department from Biogen, Schering, Serono, Teva, Bayer, and Baxter; Dr. Tscherning has nothing to declare; Dr. Mathiesen has nothing to declare; Dr. Langkilde has nothing to declare; Dr. Ross has nothing to declare; Dr. Ravnborg has received honoraria for lecturing and research grants for his department from Sanofi Aventis, Schering, and Biogen; Dr. Bendtzen has received honoraria for expert testimony.
Received January 30, 2006. Accepted in final form July 10, 2006.
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