LONDON (Reuters) - Biogen Idec and Elan have filed for approval to sell their drug Tysabri as a first-line treatment for multiple sclerosis, a move that could boost sales of the drug. Demand for Tysabri has been curtailed due to concerns over its association with a potentially fatal infection known as progressive multifocal leukoencephalopathy, or PML, which is caused by the JC virus. Now, however, there is a test for the virus to predict if patients are at risk of developing PML, opening the possibility that Tysabri could be used more widely and at an earlier stage of treatment. Biogen and Elan said on Wednesday they had submitted applications to the U.S. Food and Drug Administration and the European Medicines Agency seeking approval for first-line use in patients with relapsing forms of multiple sclerosis (MS) who have tested negative for antibodies to the JC virus. The JC virus is generally harmless, but in people with weakened immune systems, such as those using immune system-suppressing drugs like Tysabri, it can lead to an increased chance of developing PML. Tysabri use is currently limited to between 10 and 12 percent of treated MS patients, due to the risk of PML, and analysts … Continue reading
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