Novartis announced that Nature Medicine published final results from both the two- and three-copy cohorts of the completed Phase 3 SPR1NT trial as separate companion manuscripts, reinforcing the transformational benefit of Zolgensma® (onasemnogene abeparvovec) when used early. These data demonstrate that, whether they have two or three copies of the SMN2 gene, nearly all children with spinal muscular atrophy (SMA) treated presymptomatically with Zolgensma were able to achieve age-appropriate motor milestones, including sitting independently, standing and walking.(1,2) The final results from the two-and three-copy cohort were presented during the European Academy for Neurology Virtual Congress in 2021, and the 2022 Muscular Dystrophy Association (MDA) Clinical and Scientific Conference, respectively.
The data represent a significant contrast to the natural history of SMA, a devastating disease affecting approximately one in 10,000 infants worldwide. If left untreated, patients with two copies of the SMN2 gene typically develop SMA Type 1, which leads to progressive and irreversible loss of motor function and, in most cases, death or permanent ventilation by the age of two years.(3,4) Most children with three copies of the SMN2 gene develop SMA Type 2, characterized by the inability to walk independently.
“The robust data from both the two- and three-copy SPR1NT cohorts are being published together for the first time, further supporting the significant and clinically meaningful benefit of Zolgensma in presymptomatic babies with SMA,” said Shephard Mpofu, M.D., SVP, Chief Medical Officer, Novartis Gene Therapies. “When treated with Zolgensma prior to the onset of symptoms, not only did all 29 patients enrolled in SPR1NT survive, but were thriving – breathing and eating on their own, with most even sitting, standing and walking without assistance.”
The results from the SPR1NT study showed that, remarkably:
- All children (100 percent) treated presymptomatically in the SPR1NT two-copy cohort met the primary endpoint of sitting independently for ≥30 seconds, including 11/14 (79 percent) who achieved this milestone within the World Health Organization (WHO) window of normal development. A majority of patients went on to stand independently (11/14) and walk independently (9/14), most within the typical range of normal development.(1)
- In the three-copy cohort of SPR1NT, 14/15 children (93 percent) went on to walk independently, most (11/15, 73 percent) within the WHO window of normal development. All 15 children (100 percent) met the primary endpoint of standing alone ≥3 seconds, including 14/15 (93 percent) within the WHO window of normal development.(2)
- Reported adverse reactions were consistent with previous data, with no new safety signals identified.
- Patients enrolled in SPR1NT are invited for long-term follow-up study to collect additional safety and efficacy data; associated updates evaluating motor function gains will be published later this year.
Parents Amy and Adan Medina enrolled their daughter Amelia in the SPR1NT trial upon birth, after an amniocentesis during pregnancy confirmed Amelia had SMA Type 1. The family sought to test for the disease early after the Medina’s first two children were diagnosed with SMA years prior. Amelia was the first child treated as part of the trial, at 11 days old.
“Amelia has met all of her motor milestones on time, and is sitting, standing and walking independently. She is indistinguishable from her healthy peers without SMA,” Amy said. “This is especially meaningful to our family as our older two children with SMA were born before treatment with a one-time gene therapy was even a possibility.”
Zolgensma® (onasemnogene abeparvovec) is the only approved gene therapy for the treatment of spinal muscular atrophy (SMA) and the only SMA treatment designed to directly address the genetic root cause of the disease by replacing the function of the missing or non-working SMN1 gene to halt disease progression through sustained SMN protein expression with a single, one-time IV infusion. Zolgensma is now approved in more than 40 countries and more than 2,000 patients have been treated with Zolgensma globally across clinical trials, managed access programs, and in the commercial setting.(5) Novartis Gene Therapies is unwavering in its commitment to reimagine the possibilities for children living with SMA and continues to evaluate Zolgensma across a robust clinical development program, as well as the investigational intrathecal administration of OAV101 in patients with later-onset forms of SMA.
Novartis Gene Therapies has an exclusive, worldwide license with Nationwide Children’s Hospital to both the intravenous and intrathecal delivery of AAV9 gene therapy for the treatment of all types of SMA; has an exclusive, worldwide license from REGENXBIO for any recombinant AAV vector in its intellectual property portfolio for the in vivo gene therapy treatment of SMA in humans; an exclusive, worldwide licensing agreement with Généthon for in vivo delivery of AAV9 vector into the central nervous system for the treatment of SMA; and a non-exclusive, worldwide license agreement with AskBio for the use of its self- complementary DNA technology for the treatment of SMA.
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