To Assess the Efficacy, Safety, and Tolerability of INCB000928 in Participants With Fibrodysplasia Ossificans Progressiva

Inclusion Criteria:

• Female and male adults and adolescents ≥ 12 years of age with a diagnosis of FOP.
• Willingness to avoid pregnancy or fathering children based on the criteria below.
• Willing and able to undergo low-dose WBCT (excluding the head) imaging without requiring intubation.
• Further inclusion criteria apply.

Exclusion Criteria:

• Pregnant or breast-feeding.
• CAJIS score ≥ 24.
• FOP disease severity that in the investigator's opinion precludes participation.
• Any clinically significant medical condition other than FOP that would, in the investigator's judgment, interfere with full participation in the study, pose a significant risk to the participant, or interfere with interpretation of study data.
• Chronic or current active infectious disease requiring systemic antibiotic, antifungal, or antiviral treatment.
• HIV, HBV, or HCV infection. Note:
• Further exclusion criteria apply.