Pre-Symptomatic Study of Intravenous AVXS-101 in Spinal Muscular Atrophy (SMA) for Patients With Multiple Copies of SMN2 (SPR1NT)
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|ClinicalTrials.gov Identifier: NCT03505099|
Recruitment Status : Recruiting
First Posted : April 23, 2018
Last Update Posted : September 6, 2018
|Condition or disease||Intervention/treatment||Phase|
|Spinal Muscular Atrophy||Biological: AVXS-101||Phase 3|
Phase 3, open-label, single-arm study of a single, one-time dose of AVXS-101 (gene replacement therapy) in patients with spinal muscular atrophy (SMA) who meet enrollment criteria and are genetically defined by bi-allelic deletion of SMN1 with 2, 3, or 4 copies of survival motor neuron 2 gene (SMN2). Patients with SMN1 point mutations or the SMN2 gene modifier mutation (c.859G>C) may enroll but will not be included in the efficacy analysis sets.
The study will enroll at least fifteen (15) patients with 2 copies of SMN2 that meet the Intent To Treat (ITT) criteria, at least twelve (12) patients with 3 copies of SMN2 that meet the ITT criteria and at least seventeen (17) patients with 4 copies of SMN2 that meet the ITT criteria. Patients in all three cohorts must be ≤6 weeks of age at the time of gene replacement therapy (Day 1).
The study includes a screening period, a gene replacement therapy period, and a follow-up period. During the screening period (Days -30 to -2), patients whose parent(s)/legal guardian(s) provide informed consent will undergo screening procedures to determine eligibility for study enrollment. Patients who meet the entry criteria will enter the in-patient gene replacement therapy period (Day -1 to Day 2). On Day -1, patients will be admitted to the hospital for pre-treatment baseline procedures. On Day 1, patients will receive a single, one-time intravenous (IV) infusion of AVXS-101, and will undergo in-patient safety monitoring for a minimum of 24 hours post infusion. Patients may be discharged 24 hours after the infusion, based on Investigator judgment. During the outpatient follow-up period (Days 3 to End of Study at 18, 24 or 36 months of age, dependent upon respective SMN2 copy number), patients will return at regularly scheduled intervals for efficacy and safety assessments until the End of Study when the patient reaches 18 months of age (SMN2 = 2), 24 months of age (SMN2 = 3) or 36 months of age (SMN2 = 4). After the End of Study visit, eligible patients will be asked to rollover into a long-term follow up study.
|Study Type :||Interventional (Clinical Trial)|
|Estimated Enrollment :||44 participants|
|Intervention Model:||Single Group Assignment|
|Intervention Model Description:||Open-label, single arm|
|Masking:||None (Open Label)|
|Official Title:||A Global Study of a Single, One-Time Dose of AVXS-101 Delivered to Infants With Genetically Diagnosed and Pre-symptomatic Spinal Muscular Atrophy With Multiple Copies of SMN2|
|Actual Study Start Date :||April 10, 2018|
|Estimated Primary Completion Date :||October 2020|
|Estimated Study Completion Date :||April 2023|
One-time intravenous infusion of AVXS-101 at 1.1 X 1014 vg/kg
A non-replicating recombinant AAV9 containing the complimentary deoxyribonucleic acid (cDNA) of the human SMN gene under the control of the cytomegalovirus (CMV) enhancer/chicken-β-actin-hybrid promoter (CB). The AAV inverted terminal repeat (ITR) has been modified to promote intramolecular annealing of the transgene, thus forming a double-stranded transgene ready for transcription.
- 2 copies SMN2 gene: functional independent sitting [ Time Frame: 18 months of age ]Proportion of patients demonstrating functional independent sitting for at least 30 seconds
- 3 copies of SMN2 gene: standing without support [ Time Frame: 24 months of age ]Proportion of patients achieving the ability to stand without support for at least three seconds
- 4 copies of SMN2 gene: demonstrating motor improvements inconsistent with SMA natural history [ Time Frame: 36 months of age ]Proportion of patients demonstrating the ability to achieve a scaled score on Bayley V.3 Gross and Fine Motor Subtests within 1.5 standard deviations of chronological development reference standard
To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT03505099
|Contact: AveXis MedInfofirstname.lastname@example.org|
Show 23 Study Locations
|Study Chair:||Doug Feltner, MD||AveXis, Inc.|