Abstract Details

Title Integrated Analyses of Data from Clinical Trials of Delandistrogene Moxeparvovec (SRP-9001) in Duchenne Muscular Dystrophy (DMD)

Topic Neuromuscular and Clinical Neurophysiology (EMG)

Presentation(s) S48 - Therapeutics for Muscle Disease (4:30 PM-4:42 PM)

Poster/Presentation
Number 006

Background Delandistrogene moxeparvovec is an investigational gene transfer therapy developed to address the root cause of DMD through targeted skeletal and cardiac muscle expression of SRP-9001 dystrophin protein, which contains key functional domains of dystrophin.

Objective To evaluate functional data in patients with Duchenne muscular dystrophy (DMD) ≥4 to ≤8 years of age at 1 year following a single intravenous (IV) infusion of delandistrogene moxeparvovec (SRP-9001) versus a propensity-score-weighted external control (EC) cohort.

Design/Methods

Ambulatory patients with DMD ≥4 to ≤8 years of age received a single IV infusion of delandistrogene moxeparvovec (1.33x10¹⁴vg/kg, linear standard qPCR).

The dataset included patients treated with clinical process delandistrogene moxeparvovec material (Study 101, Phase 1/2a; NCT03375164 and Study 102, Phase 2; NCT03769116) and intended commercial process delandistrogene moxeparvovec material (ENDEAVOR, Phase 1b; NCT04626674). Data were compared with a propensity-score-weighted EC cohort (N=131), comprised of natural history and external clinical trial data from three studies. The primary endpoint was 1-year change from baseline in North Star Ambulatory Assessment (NSAA) total score. Exploratory endpoints included effect on key timed function tests 1 year post-treatment. Collective safety data available from Study 101, Study 102 and ENDEAVOR are also presented.

Results The integrated analysis evaluated functional data from 52 patients, including patients from Study 101 (N=4), Study 102 (n=28) and Cohort 1 of ENDEAVOR (n=20). Results showed a statistically significant difference of 2.4 points (P<0.0001) in NSAA change from baseline to Year 1 in treated patients versus the EC cohort (n=105). In a collective safety analysis from the three studies, there were no adverse events that led to study discontinuation and no deaths.

Conclusions Delandistrogene moxeparvovec demonstrated a clinically meaningful and statistically significant difference in NSAA versus a propensity-score-weighted EC cohort at Year 1, suggesting a beneficial modification of the DMD disease trajectory. Collective safety data were consistent and manageable across studies.

Authors/Disclosures
Craig M. Zaidman, MD (Washington University in St Louis) PRESENTER	Dr. Zaidman has received personal compensation in the range of $10,000-$49,999 for serving as a Consultant for sarepta. The institution of Dr. Zaidman has received research support from Washington University in St Louis. The institution of Dr. Zaidman has received research support from Novartis.
Crystal M. Proud, MD (CSG Child & Adolescent Neurology)	Dr. Proud has received personal compensation in the range of $5,000-$9,999 for serving as a Consultant for Avexis. Dr. Proud has received personal compensation in the range of $5,000-$9,999 for serving as a Consultant for Biogen. Dr. Proud has received personal compensation in the range of $5,000-$9,999 for serving as a Consultant for Sarepta. Dr. Proud has received personal compensation in the range of $5,000-$9,999 for serving on a Speakers Bureau for Avexis. Dr. Proud has received personal compensation in the range of $10,000-$49,999 for serving on a Speakers Bureau for Biogen. The institution of Dr. Proud has received research support from Biogen. The institution of Dr. Proud has received research support from Sarepta. The institution of Dr. Proud has received research support from Avexis. The institution of Dr. Proud has received research support from PTC. The institution of Dr. Proud has received research support from CSL Behring. The institution of Dr. Proud has received research support from Scholar Rock. The institution of Dr. Proud has received research support from Catabasis.
Perry Shieh, MD, PhD, FAAN (UCLA)	Dr. Shieh has received personal compensation in the range of $10,000-$49,999 for serving as a Consultant for Sarepta. Dr. Shieh has received personal compensation in the range of $10,000-$49,999 for serving as a Consultant for Genentech. Dr. Shieh has received personal compensation in the range of $10,000-$49,999 for serving as a Consultant for Biogen. Dr. Shieh has received personal compensation in the range of $5,000-$9,999 for serving as a Consultant for Alexion. Dr. Shieh has received personal compensation in the range of $10,000-$49,999 for serving as a Consultant for Argenx. Dr. Shieh has received personal compensation in the range of $5,000-$9,999 for serving as a Consultant for UCB. Dr. Shieh has received personal compensation in the range of $5,000-$9,999 for serving on a Speakers Bureau for CSL Behring. Dr. Shieh has received personal compensation in the range of $5,000-$9,999 for serving on a Speakers Bureau for Grifols. Dr. Shieh has received personal compensation in the range of $5,000-$9,999 for serving on a Speakers Bureau for Alexion. Dr. Shieh has received personal compensation in the range of $50,000-$99,999 for serving on a Speakers Bureau for Biogen. Dr. Shieh has received personal compensation in the range of $10,000-$49,999 for serving on a Speakers Bureau for Genentech. Dr. Shieh has received personal compensation in the range of $5,000-$9,999 for serving on a Speakers Bureau for Argenx. Dr. Shieh has received personal compensation in the range of $10,000-$49,999 for serving on a Speakers Bureau for Catalyst.
Craig McDonald, MD (UC Davis Dept. of PM&R)	Dr. McDonald has received personal compensation in the range of $10,000-$49,999 for serving as a Consultant for Sarepta Therapeutics. Dr. McDonald has received personal compensation in the range of $10,000-$49,999 for serving as a Consultant for PTC Therapeutics. Dr. McDonald has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Astellas. Dr. McDonald has received personal compensation in the range of $5,000-$9,999 for serving as a Consultant for Capricor Therapeutics. Dr. McDonald has received personal compensation in the range of $5,000-$9,999 for serving as a Consultant for Catabasis. Dr. McDonald has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Epirium Bio. Dr. McDonald has received personal compensation in the range of $0-$499 for serving as a Consultant for Italfarmaco. Dr. McDonald has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Santhera Pharmaceuticals. Dr. McDonald has received personal compensation in the range of $10,000-$49,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Sarepta Therapeutics. Dr. McDonald has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for PTC Therapeutics. Dr. McDonald has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Capricor. Dr. McDonald has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Catabasis Pharmaceuticals. Dr. McDonald has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Santhera Pharmaceuticals. The institution of Dr. McDonald has received research support from Sarepta Therapeutics. The institution of Dr. McDonald has received research support from PTC Therapeutics. The institution of Dr. McDonald has received research support from Santhera Pharmaceuticals. The institution of Dr. McDonald has received research support from Astellas. The institution of Dr. McDonald has received research support from Capricor Therapeutics. The institution of Dr. McDonald has received research support from Catabasis. The institution of Dr. McDonald has received research support from Epirium Bio. The institution of Dr. McDonald has received research support from Italfarmaco. Dr. McDonald has received research support from NS Pharma. The institution of Dr. McDonald has received research support from Pfizer. The institution of Dr. McDonald has received research support from NIH (NINDS). The institution of Dr. McDonald has received research support from NIDILRR. The institution of Dr. McDonald has received research support from Department of Defense. The institution of Dr. McDonald has received research support from Parent Project Muscular Dystrophy. The institution of Dr. McDonald has received research support from Muscular Dystrophy Association. Dr. McDonald has received personal compensation in the range of $500-$4,999 for serving as a Member National Advisory Board for Medical Rehabilitation Research with NIH.
John W. Day, MD, PhD (Stanford University School of Medicine)	Dr. Day has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Affinia Therapeutics. Dr. Day has received personal compensation in the range of $5,000-$9,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Novartis Gene Therapy. Dr. Day has received personal compensation in the range of $5,000-$9,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Biogen. Dr. Day has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Roche/Genentech. Dr. Day has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Sarepta. Dr. Day has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Scholar Rock. Dr. Day 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. Day has received personal compensation in the range of $10,000-$49,999 for serving as an officer or member of the Board of Directors for Muscular Dystrophy Association. The institution of Dr. Day has received research support from Audentes. The institution of Dr. Day has received research support from Novartis Gene Therapy. The institution of Dr. Day has received research support from Biogen. The institution of Dr. Day has received research support from Cytokinetics. The institution of Dr. Day has received research support from Roche/Genentech. The institution of Dr. Day has received research support from Sanofi/Genzyme. The institution of Dr. Day has received research support from Sarepta. The institution of Dr. Day has received research support from Scholar Rock. Dr. Day has received intellectual property interests from a discovery or technology relating to health care.
Stefanie Mason, MD	Dr. Mason has received personal compensation for serving as an employee of Sarepta. Dr. Mason has stock in Sarepta. An immediate family member of Dr. Mason has stock in Sarepta. The institution of an immediate family member of Dr. Mason has received research support from Biogen. The institution of Dr. Mason has received research support from NIH. The institution of Dr. Mason has received research support from Chest Foundation.
	No disclosure on file
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Eddie Darton (Sarepta Therapeutics)	No disclosure on file
Christoph Wandel, MD, PhD	Christoph Wandel, MD, PhD has received personal compensation for serving as an employee of F Hoffmann-LaRoche AG. Christoph Wandel, MD, PhD has stock in F Hoffmann-La Roceh AG, Basel, CH; Bayer AG, Leverkusen, FRG.
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	No disclosure on file
Tejdip Singh (Sarepta)	Tejdip Singh has received personal compensation for serving as an employee of Sarepta Therapeutics . Tejdip Singh has received stock or an ownership interest from Sarepta Therapeutics.
Louise R. Rodino-Klapac (Sarepta Therapeutics)	Ms. Rodino-Klapac has received personal compensation for serving as an employee of Sarepta Therapeutics, Inc.. Ms. Rodino-Klapac has received stock or an ownership interest from Sarepta Therapeutics. Ms. Rodino-Klapac has received intellectual property interests from a discovery or technology relating to health care.
Jerry R. Mendell, MD, FAAN (The Research Institute at Nationwide Children's Hospital)	Dr. Mendell has received personal compensation in the range of $10,000-$49,999 for serving as a Consultant for Vertex. Dr. Mendell has received personal compensation in the range of $10,000-$49,999 for serving as a Consultant for Novartis. Dr. Mendell has received personal compensation in the range of $10,000-$49,999 for serving as a Consultant for Sarepta Therapeutics . The institution of Dr. Mendell has received research support from Sarepta.