An Active Treatment Study of SRK-015 in Patients With Type 2 or Type 3 Spinal Muscular Atrophy
Condition: Spinal Muscular Atrophy; Spinal Muscular Atrophy Type 3; Spinal Muscular Atrophy Type 2; SMA; Neuromuscular Diseases; Muscular Atrophy; Atrophy; Muscular Atrophy, Spinal; Neuromuscular Manifestations
MeSH terms: Muscular Atrophy; Muscular Atrophy, Spinal; Neuromuscular Diseases; Spinal Muscular Atrophies of Childhood; Neuromuscular Manifestations; Atrophy
Intervention: SRK-015
Intervention description: SRK-015 is a fully human anti-proMyostatin monoclonal antibody (mAb) of the immunoglobulin G4 (IgG4)/lambda isotype that binds to human pro/latent myostatin with high affinity. SRK-015 will be administered every 4 weeks by intravenous infusion.
Phase: Phase 2
Study type: Interventional
Primary purpose: Treatment
Allocation: Randomized
Intervention model: Parallel Assignment
Masking: None (Open Label)
Masking description: Active treatment, randomized, double-blind for Cohort 3
Enrollment: 58.0
Sex: All
Minimum age: 2 Years
Maximum age: 21 Years
Healthy volunteers: No

Summary:

      The TOPAZ study will assess the safety and efficacy of SRK-015 in later-onset Spinal Muscular
      Atrophy (SMA Type 2 and Type 3) in pediatric and adult patients.
    

Eligibility criteria:

        Inclusion Criteria:

          -  Age 5 through 21 years old at the time of screening for Cohorts 1 and 2; Age ≥2 years
             old at the time of screening for Cohort 3.

          -  Documented diagnosis of 5q SMA.

          -  Diagnosed as later-onset (e.g., Type 2 or Type 3) SMA prior to receiving any treatment
             with therapy approved for SMA.

          -  Non-ambulatory patients must be able to sit independently (sits up straight with head
             erect for at least 10 seconds; does not use arms or hands to balance body or support
             position) per World Health Organization (WHO) motor milestones definition at
             screening.

          -  Ambulatory patients must have the ability to independently ambulate without aids or
             orthotics over 10 meters in 30 seconds or less at screening.

          -  Receiving the same background SMA therapy (e.g., on an approved survival motor neuron
             (SMN) upregulator therapy such as nusinersen, or not on any SMA therapy) for at least
             6 months prior to screening and anticipated to remain on that therapy throughout the
             duration of the study.

               -  If receiving the SMN upregulator therapy nusinersen, must have completed the
                  loading regimen and initiated maintenance dosing (i.e., completed at least one
                  maintenance dose) with at least 4 weeks after the first maintenance dose having
                  elapsed prior to screening.

          -  Nutritional status stable over the past 6 months and anticipated to be stable
             throughout the duration of the study.

          -  Have no physical limitations that would prevent the patient from undergoing motor
             function outcome measures throughout the duration of the study.

          -  Able to receive study drug infusions and provide blood samples through the use of a
             peripheral intravenous (IV) or a long-term IV access device that the patient has
             placed for reasons independent from the study throughout the duration of the study.

          -  Able to adhere to the requirements of the protocol, including travel to the study
             center and completing all study procedures and study visits.

          -  For patients who are expected to have reached reproductive maturity by the end of the
             study, adhere to study specific contraception requirements.

        Exclusion Criteria:

          -  Use of tracheostomy with positive pressure.

          -  Use of chronic daytime non-invasive ventilatory support for >16 hours daily in the 2
             weeks prior to dosing, or anticipated to regularly receive such daytime ventilator
             support chronically over the duration of the study.

          -  Any acute or co-morbid condition interfering with the well-being of the patient within
             14 days of screening, including active systemic infection, the need for acute
             treatment or inpatient observation due to any reason.

          -  Severe scoliosis and/or contractures at screening. Based on clinical judgement, any
             scoliosis or contractures present must be stable over the past 6 months, anticipated
             to be stable for the duration of the study and not prevent the patient from being
             evaluated on any functional outcome measures throughout the duration of the study.

          -  Pregnant or breastfeeding.

          -  Major orthopedic or other interventional procedure, including spine or hip surgery,
             considered to have the potential to substantially limit the ability of the patient to
             be evaluated on any functional outcome measures, within 6 months prior to screening,
             or anticipated for the duration of the study.

          -  Prior history of a hypersensitivity reaction to a monoclonal antibody (mAb) or
             recombinant protein bearing an Fc domain (such as a soluble receptor- Fc fusion
             protein).

          -  Use of systemic corticosteroids within 60 days prior to screening. Inhaled or topical
             steroids are allowed.

          -  Treatment with investigational drugs within 3 months prior to screening.

          -  Use of therapies with potentially significant muscle effects (such as androgens,
             insulin-like growth factor, growth hormone, systemic betaagonist, botulinum toxin, or
             muscle relaxants) or muscle-enhancing supplements within 60 days prior to screening.

          -  Patient has any other condition, which in the opinion of the Investigator may
             compromise safety or compliance, would preclude the patient from successful completion
             of the study, or interfere with the interpretation of the results.