Question: We know that Tysabri is very effective in reducing relapse frequency and appearing of new lesions, but how effective is it in preventing progression? Or conversion from RRMS to SPMS?
Answer: Several small studies suggest a benefit of Tysabri for secondary progressive MS. A large definitive clinical trial called ASCEND, funded by Biogen Idec, is underway with expected completion by the end of 2014.
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