In a CRL issued for valoctocogene roxaparvovec, the FDA told BioMarin that differences between its Phase I/II and Phase III studies limited the ability to rely on the earlier trial to support durability of effect, which an analyst said likely referred to a product comparability issue.
While there had been some risks to filgotinib's approval cited before, analysts expressed surprise at the decision, with one writing it would likely delay approval by at least a year. Shares of both companies fell sharply on the news.
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The decision stood in contrast with the agency's highly controversial approval of Sarepta's previous DMD drug, Exondys 51. The company's shares fell sharply in after-hours trading.