Question · Q4 2025
Evan David Seigerman inquired about the potential impact of high-dose Spinraza's anticipated U.S. approval in April on Biogen's 2026 rare disease top-line growth.
Answer
Christopher A. Viehbacher, President and CEO, Biogen, noted that early signs from the Japan launch (the first country to approve) show higher initial results and switchbacks, exceeding expectations. He highlighted the significantly increased efficacy observed in studies, which could make the choice between oral convenience and Spinraza's efficacy harder for physicians and parents. While market research suggests sales increases, he emphasized the need to observe actual sales and physician willingness to transition patients, but sees an opportunity for upside.
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