A Phase 3 study to determine the Efficacy and Safety of Losmapimod in Treating Patients with Facioscapulohumeral Muscular Dystrophy (REACH)

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• Part A: 1. History of any illness or any clinical condition that might confound the results of the study or pose an additional risk in administering study drug to the patient. 2. Previously diagnosed cancer that has not been in complete remission for at least 5 years. Localized carcinomas of the skin and carcinoma in situ of the cervix that have been resected or ablated for cure are not exclusionary. 3. For patients who are on drug(s) or supplements that may affect muscle function or that are included in the list of drugs presented in Appendix 3 of the Protocol: pt must be on a stable dose of that drug(s) or supplement for at least 3 months prior to the first dose of study drug and remain on that stable dose for the duration of the study. 4. History of febrile illness within 5 days before the first study drug dose 5. Known active opportunistic or life-threatening infections including HIV and hepatitis B or C 6. Known active or inactive tuberculosis infection. 7. Current acute liver disease or chronic liver disease as defined by any of the following: current ALT ≥2 × upper limit of normal (ULN) or total bilirubin >1.5 × ULN (unless participant has Gilbert's syndrome characterized by the combination of total bilirubin < 3 × ULN, direct bilirubin within the normal range and normal ALT and AST, or the presence of mutations in the UDP-glucuronosyltransferase 1 gene, indicative of Gilbert's syndrome); or Positive for hepatitis B or surface antigen; or Positive for hepatitis C antibody unless additional testing for hepatitis C viral RNA is negative, ALT is < 2 × ULN and total bilirubin is ≤1.5 × ULN, indicating inactive/resolved hepatitis C infection 8. Known severe renal impairment (defined as a glomerular filtration rate of < 30 mL/min/1.73 m2). 9. Standard 12-lead ECG demonstrating QTcF >450 msec for male patients and QTcF >470 msec for female patients at screening. If QTcF exceeds 450 msec for males or 470 msec for females, the ECG will be repeated 2 more times, and the average of the 3 QTcF values will be used to determine the patient's eligibility. 10. History of cardiac dysrhythmias requiring anti-arrhythmia treatment(s); or history or evidence of abnormal ECGs 11. Male patients with a female partner who is planning to become pregnant during the study or within 90 days after the last study drug dose
• 12. Concomitant use of cytotoxic chemotherapy for cancer or known ongoing or anticipated use of chronic severe immunosuppressive agents. 13. Positive pregnancy test or known to be pregnant or lactating or planning to become pregnant during study drug administration and until 90 days after last dose 14. Any current mental condition (psychiatric disorder, senility or dementia) 15. Patient has any condition possibly affecting drug absorption 16. History of alcohol, analgesic/opioid, and/or illicit drug abuse, as defined by the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (American Psychiatric Association, 2013), in the last 6 months before screening or a positive test for drugs of abuse at screening. Use of CBD/THC is permitted 17. Use of another IP within 30 days or 5 half-lives 18. Current or anticipated participation in a natural hx study. 19. Known hypersensitivity or intolerance to losmapimod or any of its excipients 20. Previous participation in a Fulcrum-sponsored FSHD losmapimod study 21. Anticipated inability to comply with any study procedures, study visits according to the visit schedule through 48 weeks. 22. Abnormal laboratory results indicative of any significant medical disease 23. Pt, or close relative of the patient to staff directly involved with the conduct of the study 24. Pt is vulnerable (i.e., deprived of freedom), including inmates of psychiatric wards and prison or state institutions, patients with commitments to an institution, or a patient who is detained or committed to an institution by a law court or by legal authorities. 25. For Italy only: Vaccination with a live attenuated vaccine within 6 weeks prior to randomization until the safety follow-up visit Part B: 1. Any clinical condition that, in the opinion of the Investigator, might confound the results of the study or pose an additional risk in administering study drug to the patient. 2. Male patients with a female partner who is planning to become pregnant during the study or within 90 days after the last study drug dose. 3. Anticipated inability to comply with any study procedures, including participation in study visits.