An Efficacy and Safety Study of Palovarotene to Treat Preosseous Flare-ups in FOP Subjects

Fibrodysplasia Ossificans Progressiva Clinical Trial

Official title: A Phase 2 Randomized, Double-Blind, Placebo-Controlled Efficacy and Safety Study of a RARγ-Specific Agonist (Palovarotene) in the Treatment of Preosseous Flare-ups in Subjects With Fibrodysplasia Ossificans Progressiva (FOP)

Status Completed

Clinical Trial Summary

Fibrodysplasia ossificans progressiva (FOP) is a rare, severely disabling disease characterized by painful, recurrent episodes of soft tissue swelling (flare-ups) that result in abnormal bone formation in muscles, tendons, and ligaments. Flare-ups begin early in life and may occur spontaneously or after soft tissue trauma, vaccinations, or influenza infections. Recurrent flare-ups progressively restrict movement by locking joints leading to cumulative loss of function and disability. Mouse models of FOP have demonstrated the ability of retinoic acid receptor (RAR) gamma agonists to prevent heterotopic ossification (HO) following injury. The purpose of the study is to evaluate whether palovarotene, an RAR gamma agonist, will prevent HO during and following a flare-up in subjects with FOP.

Clinical Trial Description

The primary objective is to evaluate the ability of different doses of palovarotene to prevent HO at the flare-up site in subjects with FOP as assessed by plain radiographs.

This is a Phase 2, multi-center, randomized, double-blind, sponsor-unblinded, placebo-controlled study. Two cohorts of subjects will be randomized into different dosing regimens of palovarotene for a 6-week (42 days) treatment period. The study will consist of three periods:

1. A Screening period to occur within 7 days of a distinct flare-up. The first dose of study drug will be taken within 7 days of the flare-up initiation.

2. A double-blind treatment period of 6 weeks (42 days) duration.

3. A follow-up period of 6 weeks (42 days) duration.

An initial cohort (Cohort 1) of subjects will be randomly assigned 3:1 to either palovarotene or placebo daily for 42 days. Subjects randomized to palovarotene in Cohort 1 will receive an initial daily dose of 10 mg for 14 days followed by 5 mg daily for 28 days.

In Cohort 2, new FOP subjects meeting all inclusion/exclusion criteria will be randomly assigned 3:3:2 to two dose regimens of palovarotene (10 mg for 14 days and 5 mg for 28 days; 5 mg for 14 days and 2.5 mg for 28 days) or placebo daily for 42 days. Doses will be weight-adjusted and subjects randomized within three weight-range categories (20 to <40 kg, 40 to <60 kg, and ≥60 kg).

Subjects completing the study and still meeting eligibility requirements will be given the opportunity to enroll into an open-label extension study. ;

Related Conditions & MeSH terms

• Fibrodysplasia Ossificans Progressiva

• NCT number: NCT02190747
• Study type: Interventional
• Source: Ipsen
• Status: Completed
• Phase: Phase 2
• Start date: July 14, 2014
• Completion date: May 23, 2016