Biogen, Inc. plans to initiate a Phase IV clinical trial by the first quarter of 2021 that will test the risk versus benefit of administering its spinal muscular atrophy (SMA) drug Spinraza (nusinersen) for two years to patients who already have been treated with a once-in-a-lifetime dose of Novartis AG’s gene therapy Zolgensma (onasemnogene abeparvovec).
Zolgensma is the biggest threat to Spinraza’s blockbuster commercial status, but both products may soon face competition from Roche...







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