Ipsen’s Palovarotene Ultra-Rare Bone Disorder Drug Faces Hurdles At US FDA Adcomm

Agency questions whether post hoc analyses and use of natural history subjects as an external control group in a Phase III study support effectiveness of palovarotene; cites apparent increased incidence of flare-up events as a key safety issue.

Boat uncertainty
Fate of Ipsen's rare disease drug palovarotene is uncertain given questions raised about study data • Source: Shutterstock

The US Food and Drug Administration expressed uncertainty about whether a Phase III study of Ipsen SA’s palovarotene demonstrates efficacy for treatment of patients with fibrodysplasia ossificans progressiva since the study failed its prespecified primary efficacy analysis and the new drug application relies on post hoc analyses to support a showing of efficacy.

The FDA’s Endocrinologic and Metabolic Drugs Advisory Committee is to consider Ipsen’s application at its 28 June meeting. In a...

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