In-Home Evaluation of Episodic Administration of Palovarotene in Fibrodysplasia Ossificans Progressiva (FOP) Subjects

Inclusion Criteria: For study enrollment * Completed Study PVO-1A-202 having been treated with palovarotene (ie, 6 weeks on-treatment and 6-weeks follow-up) for two flare-ups. * Written, signed, and dated informed consent or age-appropriate subject/parent assent (this must be performed according to local regulations). For treatment with palovarotene for subsequent flare-ups * Symptomatic onset of a new, distinct flare-up within 10 days of the first dose of study drug. Symptoms must be reported by the subject, be consistent with their previous flare-ups, and include a subject-reported onset date. The flare-up must be confirmed by the physician at screening via telephone contact and/or video-conferencing. * Females of child-bearing potential (FOCBP) must have a negative blood (or urine) pregnancy test (with sensitivity of at least 50 mIU/mL) prior to administration of palovarotene. Male and FOCBP subjects must agree to remain abstinent during treatment and for 1 month after treatment or, if sexually active, to use two highly effective methods of birth control during and for 1 month after treatment. Additionally, sexually active FOCBP subjects must already be using two highly effective methods of birth control 1 month before treatment is to start. Specific risk of the use of retinoids during pregnancy, and the agreement to remain abstinent or use two highly effective methods of birth control will be clearly defined in the informed consent, and the subject or legally authoriz…