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Abstract Details

Design of REACH: Phase 3 Randomized, Double-Blind, Placebo-Controlled, 48-Week Study of the Efficacy and Safety of Losmapimod in FSHD
Neuromuscular and Clinical Neurophysiology (EMG)
P6 - Poster Session 6 (5:30 PM-6:30 PM)
10-007

FSHD is a chronic, variably progressive disease leading to accumulation of disability over decades. Nonclinical studies have shown that losmapimod (a small molecule p38 α/β MAPK inhibitor) reduces the aberrant expression of DUX4, the underlying cause of FSHD. Two Phase 2 clinical studies, a 48-week randomized controlled study (ReDUX4, FIS-002-2019) and a 52-week open-label study (OLS, FIS-001-2019) demonstrated evidence of benefit of treatment with losmapimod on muscle structure and function, as well as FSHD-relevant clinical endpoints that are recognized by patients and favorable safety and tolerability, supporting continued development. Fulcrum is initiating a Phase 3 double-blind, placebo-controlled trial to support the development of losmapimod in FSHD.

Evaluate the efficacy and safety of losmapimod for the treatment of FSHD.

Approximately 230 people with FSHD, 210 with genetically confirmed FSHD1 and 20 with FSHD2, will be randomized 1:1 to receive losmapimod or placebo orally, twice daily for 48-weeks. The primary endpoint is reachable workspace quantification of total relative surface area (Q1-Q5) with 500 g wrist weight in the dominant arm, with secondary efficacy endpoints of quality of life in the neurological disorders upper extremity scale (Neuro-QoL UE), patient global impression of change (PGIC), and muscle fat infiltration (MFI) using whole-body musculoskeletal MRI (WB-MSK MRI). Exploratory assessments include muscle fat fraction, muscle strength by hand-held dynamometry, and patient reported outcomes (PRO) including patient global impression of severity (PGIS), a novel FSHD PRO, numeric pain rating scale (NPRS), 5-level EQ-5D (EQ-5D-5L) and healthcare utilization questionnaire.
The design of this Phase 3 study will be presented. 
The design of this Phase 3 study will be presented. 
Authors/Disclosures
Marie-Helene Jouvin (Fulcrum Therapeutics)
PRESENTER
Marie-Helene Jouvin has received personal compensation for serving as an employee of Fulcrum Therapeutics. Marie-Helene Jouvin has received personal compensation for serving as an employee of Pharvaris. Marie-Helene Jouvin has stock in Fulcrum Therapeutics. Marie-Helene Jouvin has stock in Pharvaris.
Alrabi Tawil, MD, FAAN (University of Rochester Medical Center) Dr. Tawil has received personal compensation in the range of $500-$4,999 for serving as a Consultant for DYNE Therapeutics. Dr. Tawil has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Arrowhead Pharma. Dr. Tawil has received personal compensation in the range of $5,000-$9,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Fulcrum Therapeutics. Dr. Tawil has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Acceleron Pharma. Dr. Tawil has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for MT Pharma. Dr. Tawil has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Roche Pharma. Dr. Tawil has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for miRecule. The institution of Dr. Tawil has received research support from Friends of FSH Research. The institution of Dr. Tawil has received research support from FSH Society. The institution of Dr. Tawil has received research support from NIH. The institution of Dr. Tawil has received research support from Fulcrum. Dr. Tawil has received intellectual property interests from a discovery or technology relating to health care. Dr. Tawil has received publishing royalties from a publication relating to health care.
No disclosure on file
Leo H. Wang, MD, PhD, FAAN (University of Washington) Dr. Wang has received personal compensation in the range of $10,000-$49,999 for serving as a Consultant for AskBio. Dr. Wang has received personal compensation in the range of $10,000-$49,999 for serving as a Consultant for Fulcrum Therapeutics. Dr. Wang has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Roche. Dr. Wang has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Mitsubishi Tanabe. Dr. Wang has received personal compensation in the range of $5,000-$9,999 for serving as a Consultant for Argenx. Dr. Wang has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Avidity. Dr. Wang has received personal compensation in the range of $5,000-$9,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Scholar Rock. The institution of Dr. Wang has received research support from National Institute of Health. Dr. Wang has received personal compensation in the range of $10,000-$49,999 for serving as a Consultant with US Government.
John Vissing, MD (Rigshospitalet) Prof. Vissing has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Sanofi. Prof. Vissing has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Dianthus Therapeutics. Prof. Vissing has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Roche. Prof. Vissing has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Amicus therapeutics. Prof. Vissing has received personal compensation in the range of $5,000-$9,999 for serving as a Consultant for Sarepta. Prof. Vissing has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Horizon Therapeutics. Prof. Vissing has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Novartis Pharma AG. Prof. Vissing has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Alexion. Prof. Vissing has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Biogen. Prof. Vissing has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Genethon. Prof. Vissing has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Sanofi. Prof. Vissing has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Roche. Prof. Vissing has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Pfizer. Prof. Vissing has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for UCB Biopharma. Prof. Vissing has received personal compensation in the range of $500-$4,999 for serving on a Speakers Bureau for Argenx. Prof. Vissing has received personal compensation in the range of $500-$4,999 for serving on a Speakers Bureau for Alexion Pharmaceuticals. Prof. Vissing has received personal compensation in the range of $500-$4,999 for serving on a Speakers Bureau for Lupin. Prof. Vissing has received personal compensation in the range of $500-$4,999 for serving on a Speakers Bureau for Edgewise Therapeutics. The institution of Prof. Vissing has received research support from Rigshospitalet. The institution of Prof. Vissing has received research support from UCB Pharma. The institution of Prof. Vissing has received research support from Sanofi. The institution of Prof. Vissing has received research support from NOVO Foundation. Prof. Vissing has received research support from Reneo Pharma. Prof. Vissing has received research support from Janssen Pharmaceuticals.
Jeffrey Statland, MD (University of Kansas Medical Center) Dr. Statland has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Arrowhead. Dr. Statland has received personal compensation in the range of $500-$4,999 for serving as a Consultant for ML Bio. Dr. Statland has received personal compensation in the range of $500-$4,999 for serving as a Consultant for MT Pharma. Dr. Statland has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Epic Bio. Dr. Statland has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Armatus . Dr. Statland has received personal compensation in the range of $10,000-$49,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Dyne Therapeutics. Dr. Statland has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Avidity . Dr. Statland has received personal compensation in the range of $5,000-$9,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Fulcrum Therapeutics. Dr. Statland has received personal compensation in the range of $5,000-$9,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Roche. The institution of Dr. Statland has received research support from NIH. The institution of Dr. Statland has received research support from FSHD Society. The institution of Dr. Statland has received research support from Friends of FSH Research. The institution of Dr. Statland has received research support from FSHD Canada. The institution of Dr. Statland has received research support from MDA.
Jennifer Shoskes, PharmD (PepGen Inc) No disclosure on file
John Jiang No disclosure on file