Irish biotechnology company Elan and USA-based Biogen Idec presented data on a post-hoc analysis of the Phase III AFFIRM trial, that show Tysabri (natalizumab) increases the probability of achieving sustained improvement in physical disability over two years when compared to placebo, in a poster presentation at the World Congress on Treatment and Research in Multiple Sclerosis in Montreal, Canada. The firms claim this is the first evidence that Tysabri is associated with a significant improvement in functional outcome in relapsing multiple sclerosis.
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