US/EU regulators start review of Biogen's high-dose Spinraza
Spinraza remains a big product for Biogen, but has seen its sales go into reverse as competition in SMA treatment has emerged from Evrysdi (risdiplam), which was approved by the FDA in 2020 and can be delivered orally, as well as Novartis' blockbuster gene therapy Zolgensma, which got a green light in 2019.