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      Results from a phase 1 study of nusinersen (ISIS-SMN Rx) in children with spinal muscular atrophy

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          Abstract

          Objective:

          To examine safety, tolerability, pharmacokinetics, and preliminary clinical efficacy of intrathecal nusinersen (previously ISIS-SMN Rx), an antisense oligonucleotide designed to alter splicing of SMN2 mRNA, in patients with childhood spinal muscular atrophy (SMA).

          Methods:

          Nusinersen was delivered by intrathecal injection to medically stable patients with type 2 and type 3 SMA aged 2–14 years in an open-label phase 1 study and its long-term extension. Four ascending single-dose levels (1, 3, 6, and 9 mg) were examined in cohorts of 6–10 participants. Participants were monitored for safety and tolerability, and CSF and plasma pharmacokinetics were measured. Exploratory efficacy endpoints included the Hammersmith Functional Motor Scale Expanded (HFMSE) and Pediatric Quality of Life Inventory.

          Results:

          A total of 28 participants enrolled in the study (n = 6 in first 3 dose cohorts; n = 10 in the 9-mg cohort). Intrathecal nusinersen was well-tolerated with no safety/tolerability concerns identified. Plasma and CSF drug levels were dose-dependent, consistent with preclinical data. Extended pharmacokinetics indicated a prolonged CSF drug half-life of 4–6 months after initial clearance. A significant increase in HFMSE scores was observed at the 9-mg dose at 3 months postdose (3.1 points; p = 0.016), which was further increased 9–14 months postdose (5.8 points; p = 0.008) during the extension study.

          Conclusions:

          Results from this study support continued development of nusinersen for treatment of SMA.

          Classification of evidence:

          This study provides Class IV evidence that in children with SMA, intrathecal nusinersen is not associated with safety or tolerability concerns.

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          Most cited references11

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          Spinal muscular atrophy.

          Spinal muscular atrophy is an autosomal recessive neurodegenerative disease characterised by degeneration of spinal cord motor neurons, atrophy of skeletal muscles, and generalised weakness. It is caused by homozygous disruption of the survival motor neuron 1 (SMN1) gene by deletion, conversion, or mutation. Although no medical treatment is available, investigations have elucidated possible mechanisms underlying the molecular pathogenesis of the disease. Treatment strategies have been developed to use the unique genomic structure of the SMN1 gene region. Several candidate treatment agents have been identified and are in various stages of development. These and other advances in medical technology have changed the standard of care for patients with spinal muscular atrophy. In this Seminar, we provide a comprehensive review that integrates clinical manifestations, molecular pathogenesis, diagnostic strategy, therapeutic development, and evidence from clinical trials.
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            An expanded version of the Hammersmith Functional Motor Scale for SMA II and III patients.

            To develop and evaluate an expanded version of the Hammersmith Functional Motor Scale allowing for evaluation of ambulatory SMA patients.
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              Age-related volumetric changes of brain gray and white matter in healthy infants and children.

              To date there is little information about brain development during infancy and childhood, although several quantitative studies have shown volume changes in adult brains. We performed three-dimensional magnetic resonance imaging (3D-MRI) in 28 healthy children aged 1 month to 10 years. We examined the volumes of whole brain and frontal and temporal lobes with an advanced method for segmenting images into gray matter (GM), white matter (WM) and cerebrospinal fluid (CSF) compartments. Growth spurts of whole brain and frontal and temporal lobes could be seen during the first 2 years after birth. During this period the frontal lobes grew more rapidly than the temporal lobes, the right--left asymmetry was more noticeable in the temporal lobes than in the frontal lobes and the increase in GM was larger than that in WM in the temporal lobes. Subsequently, WM volume increased at a higher rate than GM volume throughout childhood. Quantitative information on normal brain development may play a pivotal role in clarifying brain neurodevelopmental abnormalities.
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                Author and article information

                Contributors
                Journal
                Neurology
                Neurology
                neurology
                neur
                neurology
                NEUROLOGY
                Neurology
                Lippincott Williams & Wilkins (Hagerstown, MD )
                0028-3878
                1526-632X
                08 March 2016
                08 March 2016
                : 86
                : 10
                : 890-897
                Affiliations
                From the Departments of Neurology (C.A.C., J.M., D.C.D.) and Rehabilitative and Regenerative Medicine (J.M.), Columbia University, New York, NY; Department of Neurology (K.J.S.), University of Utah, Salt Lake City; Department of Neurology (B.T.D.), Boston Children's Hospital, Boston, MA; Department of Pediatrics (S.T.I.), University of Texas Southwestern Medical School, Dallas; and Ionis Pharmaceuticals, Inc. (formerly Isis Pharmaceuticals, Inc.) (D.A.N., C.F.B., K.M.B.), Carlsbad, CA.
                Author notes
                Correspondence to Dr. Chiriboga: cac3@ 123456cumc.columbia.edu

                Go to Neurology.org for full disclosures. Funding information and disclosures deemed relevant by the authors, if any, are provided at the end of the article. The Article Processing Charge was paid by Ionis Pharmaceuticals Inc.

                Article
                NEUROLOGY2015663500
                10.1212/WNL.0000000000002445
                4782111
                26865511
                62ec6abf-8c8b-441e-8816-76a81d8d9974
                © 2016 American Academy of Neurology

                This is an open access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND), which permits downloading and sharing the work provided it is properly cited. The work cannot be changed in any way or used commercially.

                History
                : 28 April 2015
                : 22 October 2015
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