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Tysabri’s PML Risk Quantified In Revised Label; Can Added Certainty Add Scripts?

This article was originally published in The Pink Sheet Daily

Executive Summary

Multiple sclerosis and Crohn’s disease patients with anti-JC virus antibodies who have previously taken other immunosuppressants have a 1.1% risk of developing the deadly neurological condition after taking Biogen Idec /Elan’s Tysabri for more than two years.

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