The U.S. Food and Drug Administration (FDA) issued a Complete Response Letter (CRL) regarding the New Drug Application for palovarotene, an investigational treatment for the reduction of new abnormal bone formation (heterotopic ossification) in people living with fibrodysplasia ossificans progressiva (FOP).
The CRL is related to the regulatory agency’s previous request for additional information on palovarotene clinical trial data communicated to Ipsen in October 2022, which is not a request for additional efficacy or safety data beyond existing studies. Ipsen anticipates responding to the request in the first quarter of 2023 with an expected six-month FDA review cycle. The FDA has not announced a rescheduled date for the Endocrinologic and Metabolic Drugs Advisory Committee meeting for investigational palovarotene.
FOP is an ultra-rare disease that causes permanent and continuous bone formation in soft and connective tissues like muscles, tendons and ligaments, also known as heterotopic ossification or HO.