Abstract Details

Title Onasemnogene Abeparvovec in Presymptomatic Spinal Muscular Atrophy (SMA): SPR1NT Study Update in Children with Three Copies of SMN2

Topic Child Neurology and Developmental Neurology

Presentation(s) P15 - Poster Session 15 (5:30 PM-6:30 PM)

Poster/Presentation
Number 6-001

Background SMA causes loss of motor and respiratory function because of SMN1 deletion/mutation. Copies of SMN2 modify disease severity. A range of phenotypes may occur with three SMN2 copies, and approximately 85% of patients develop symptoms in infancy and are unable to walk independently without intervention.

Objective SPR1NT (NCT03505099) was a multicenter, open-label, Phase III study to evaluate the safety and efficacy of onasemnogene abeparvovec in presymptomatic SMA patients with three copies of the survival motor neuron 2 gene (SMN2).

Design/Methods

Presymptomatic patients expected to develop SMA (biallelic SMN1 deletions, three SMN2 copies) received a one-time intravenous infusion of onasemnogene abeparvovec and were assessed through 24 months. Primary outcome was standing unassisted for ≥3 seconds by 24 months of age. Secondary outcome was independent walking by 24 months. Safety outcomes included incidence of adverse events (AEs)/serious AEs. Primary and secondary outcomes were compared with a cohort from the Pediatric Neuromuscular Clinical Research (PNCR) natural history data set.

Results Fifteen patients were enrolled, and all completed the study. Primary and secondary endpoints were statistically significant compared with the PNCR cohort (p<0.001). All patients were alive, and none used ventilatory or feeding tube support at any time. All 15 patients achieved the ability to stand alone (14 within the WHO-MGRS developmental window). Fourteen patients also walked alone (11 within the WHO-MGRS developmental window). All patients had AEs. Eight patients (53%) had at least one treatment-related AE, and three patients had serious AEs. No serious AEs were considered treatment-related by investigator.

Conclusions Onasemnogene abeparvovec was efficacious and well-tolerated for presymptomatic SMA patients with three SMN2 copies. All patients survived, and none used ventilatory or feeding tube support. All achieved the ability to stand alone, most within the normal developmental window. No new safety signals were identified.

Authors/Disclosures
PRESENTER	No disclosure on file
Francesco Muntoni, MD (UCL Institute of Child Health)	Dr. Muntoni has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Sarepta. Dr. Muntoni has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Pfizer. Dr. Muntoni has received personal compensation in the range of $500-$4,999 for serving on a Speakers Bureau for Sarepta. Dr. Muntoni has received personal compensation in the range of $500-$4,999 for serving on a Speakers Bureau for Pfizer. Dr. Muntoni has received personal compensation in the range of $500-$4,999 for serving on a Speakers Bureau for Biogen. Dr. Muntoni has received personal compensation in the range of $500-$4,999 for serving on a Speakers Bureau for Avexis. Dr. Muntoni has received personal compensation in the range of $500-$4,999 for serving on a Speakers Bureau for Roche. The institution of Dr. Muntoni has received research support from European Commission. The institution of Dr. Muntoni has received research support from Medical Research Council. The institution of Dr. Muntoni has received research support from Biogen. The institution of Dr. Muntoni has received research support from Muscular Dystrophy UK. The institution of Dr. Muntoni has received research support from MDA USA. The institution of Dr. Muntoni has received research support from Sarepta. The institution of Dr. Muntoni has received research support from Association Francoise Myopathies. Dr. Muntoni has received personal compensation in the range of $0-$499 for serving as a Clinical expert with UK NICE Committee.
Michelle A. Farrar	Michelle A. Farrar has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Biogen. Michelle A. Farrar has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Roche. Michelle A. Farrar has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Novartis. Michelle A. Farrar has received personal compensation in the range of $5,000-$9,999 for serving on a Speakers Bureau for Biogen. Michelle A. Farrar has received personal compensation in the range of $500-$4,999 for serving on a Speakers Bureau for Roche.
Kayoko Saito	No disclosure on file
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.
Laurent Servais (John Radcliffe Hospital)	Laurent Servais has received personal compensation in the range of $5,000-$9,999 for serving as a Consultant for Biogen. Laurent Servais has received personal compensation in the range of $5,000-$9,999 for serving as a Consultant for Roche. Laurent Servais has received personal compensation in the range of $10,000-$49,999 for serving as a Consultant for Novartis. Laurent Servais has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Astellas. Laurent Servais has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Pfizer. Laurent Servais has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Sarepta. The institution of Laurent Servais has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Evox. Laurent Servais has received personal compensation in the range of $500-$4,999 for serving as a Consultant for PTC. Laurent Servais has received personal compensation in the range of $10,000-$49,999 for serving as a Consultant for Sysnav. Laurent Servais has received personal compensation in the range of $500-$4,999 for serving as a Consultant for BioHaven. Laurent Servais has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Dyne. Laurent Servais has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Zentech. Laurent Servais has received personal compensation in the range of $500-$4,999 for serving as a Consultant for MitoRx. Laurent Servais has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Lupin. Laurent Servais has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Fibrogen. Laurent Servais has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Alltrana. Laurent Servais has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Illumina. Laurent Servais has received personal compensation in the range of $10,000-$49,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Roche. The institution of Laurent Servais has received research support from Roche. The institution of Laurent Servais has received research support from Novartis. The institution of Laurent Servais has received research support from Biogen. The institution of Laurent Servais has received research support from Zentech. The institution of Laurent Servais has received research support from BioHaven. The institution of Laurent Servais has received research support from PerkinHalmers. The institution of Laurent Servais has received research support from Scholar Rock.
Hugh J. McMillan, MD (Children's Hospital of Eastern Ontario)	Dr. McMillan has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Novartis Gene Therapies. Dr. McMillan has received personal compensation in the range of $500-$4,999 for serving on a Speakers Bureau for Novartis Gene Therapies. The institution of Dr. McMillan has received research support from Roche.
Richard S. Finkel, MD, FAAN (St. Jude Children's Research Hospital)	Dr. Finkel has received personal compensation in the range of $10,000-$49,999 for serving on a Scientific Advisory or Data Safety Monitoring board for AveXis. Dr. Finkel has received personal compensation in the range of $10,000-$49,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Biogen. Dr. Finkel has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Catabasis. Dr. Finkel 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. Finkel has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for ReveraGen. Dr. Finkel has received personal compensation in the range of $10,000-$49,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Roche. Dr. Finkel 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. Finkel has received personal compensation in the range of $500-$4,999 for serving as an Editor, Associate Editor, or Editorial Advisory Board Member for Elsevier. The institution of Dr. Finkel has received research support from AveXis. The institution of Dr. Finkel has received research support from Biogen. The institution of Dr. Finkel has received research support from Capricor. The institution of Dr. Finkel has received research support from Catabasis. The institution of Dr. Finkel has received research support from ReveraGen. The institution of Dr. Finkel has received research support from Roche. The institution of Dr. Finkel has received research support from Scholar Rock. Dr. Finkel has received intellectual property interests from a discovery or technology relating to health care. An immediate family member of Dr. Finkel has received intellectual property interests from a discovery or technology relating to health care. Dr. Finkel has received personal compensation in the range of $0-$499 for serving as a Speaker in workshop with National Academy of Sciences. Dr. Finkel has a non-compensated relationship as a advisor with n-Lorem Foundation that is relevant to AAN interests or activities. Dr. Finkel has a non-compensated relationship as a Board Member with EveryLife Foundation that is relevant to AAN interests or activities.
Kathryn J. Swoboda, MD	Dr. Swoboda has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Biogen. Dr. Swoboda has received personal compensation in the range of $500-$4,999 for serving on a Speakers Bureau for Biogen. The institution of Dr. Swoboda has received research support from Biogen.
Jennifer M. Kwon, MD, FAAN (University of Wisconsin)	Dr. Kwon has nothing to disclose.
Craig M. Zaidman, MD (Washington University in St Louis)	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.
Claudia A. Chiriboga, MD, FAAN (Columbia University)	Dr. Chiriboga has received personal compensation in the range of $5,000-$9,999 for serving as a Consultant for Genentec. Dr. Chiriboga 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. Chiriboga has received research support from Roche. The institution of Dr. Chiriboga has received research support from Avexis/Novartis. The institution of Dr. Chiriboga has received research support from Biogen. The institution of Dr. Chiriboga has received research support from NIH. The institution of Dr. Chiriboga has received research support from Biohaven. The institution of Dr. Chiriboga has received research support from Genentec. Dr. Chiriboga has received publishing royalties from a publication relating to health care.
Susan T. Iannaccone, MD, FAAN (Department of Pediatrics)	Dr. Iannaccone has received personal compensation in the range of $500-$4,999 for serving as a Consultant for AveXis. Dr. Iannaccone has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Biogen. Dr. Iannaccone has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Sarepta. Dr. Iannaccone has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for AveXis. Dr. Iannaccone 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. Iannaccone has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Catabasis. The institution of Dr. Iannaccone has received research support from AveXis. The institution of Dr. Iannaccone has received research support from Biogen. The institution of Dr. Iannaccone has received research support from Sarepta. The institution of Dr. Iannaccone has received research support from PTC Therapeutics. The institution of Dr. Iannaccone has received research support from FibroGen. The institution of Dr. Iannaccone has received research support from ReveraGen. The institution of Dr. Iannaccone has received research support from MDA. The institution of Dr. Iannaccone has received research support from PPMD. The institution of Dr. Iannaccone has received research support from NIH. Dr. Iannaccone has received personal compensation in the range of $0-$499 for serving as a grant reviewer with NIH.
Jena M. Krueger, MD (Helen DeVos Children's Hospital, Spectrum Health)	Dr. Krueger has nothing to disclose.
Julie A. Parsons, MD (Children's Hospital Colorado)	Dr. Parsons 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. Parsons has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Pfizer. Dr. Parsons has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Sanofi. Dr. Parsons has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Ultragenex. The institution of Dr. Parsons has received research support from AveXis. The institution of Dr. Parsons has received research support from Biogen. The institution of Dr. Parsons has received research support from Scholar Rock. The institution of Dr. Parsons has received research support from Biohaven. The institution of Dr. Parsons has received research support from PTC Therapeutics. The institution of Dr. Parsons has received research support from Novartis.
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.
	No disclosure on file
	No disclosure on file
Sitra Tauscher-Wisniewski	Sitra Tauscher-Wisniewski has received personal compensation for serving as an employee of Novartis Gene Therapies.
Bryan McGill, MD, PhD (Astellas Pharma Global Development, Inc.)	Dr. McGill has received personal compensation for serving as an employee of Novartis. Dr. McGill has received personal compensation for serving as an employee of AveXis. Dr. McGill has received stock or an ownership interest from Novartis.
	No disclosure on file