Duchenne Muscular Dystrophy
Conditions
Keywords
DMD, IL6, IL6R, bone, muscle, fractures, BMD, inflammation
Brief summary
The purpose of this study is to assess the efficacy, safety, pharmacokinetics (PK) and pharmacodynamics (PD) of satralizumab, a humanized anti-interleukin-6 receptor (aIL-6R) monoclonal antibody, in ambulatory and non-ambulatory participants with DMD aged ≥ 8 to \< 18 years old receiving corticosteroid therapy.
Detailed description
Participants will be included in two groups: ambulatory participants with fractures and non-ambulatory participants with or without a history of fractures (Group 1) and ambulatory participants who are fracture-naïve (Group 2) at baseline. The study will assess the potential of satralizumab to improve bone fragility and to increase muscle function. A weight-tier-based dose of satralizumab will be given by subcutaneous (SC) injection every 4 weeks (Q4W).
Interventions
DRUGSatralizumab
Satralizumab will be administered as SC injection in the abdominal or femoral region on Day 1, Weeks 2 and 4 (loading doses) and then Q4W from Week 8 until study completion (maintenance doses).
Sponsors
Hoffmann-La Roche
Study design
Allocation
NA
Intervention model
SINGLE_GROUP
Primary purpose
TREATMENT
Masking
NONE
Eligibility
Sex/Gender
MALE
Age
8 Years to 17 Years
Healthy volunteers
No
Inclusion criteria
Key Inclusion Criteria: * Signed Informed Consent Form (ICF) and signed Assent Form when appropriate * Male at birth * A definitive diagnosis of DMD prior to screening based on documentation of clinical findings and prior confirmatory genetic testing using a clinical diagnostic genetic test * Age ≥ 8 and \< 18 years at the time of signing ICF * Group 1 participants are required to meet the following criteria: - Ambulatory (defined as able to walk independently without assistive devices) with a prior history of fractures: a) Prior history of low-trauma fracture defined as: evidence of at least one prevalent vertebral compression fracture of Genant Grade 1 or 2 (or radiographic signs of vertebral fractures \[VF\]) or history of at least one low-trauma long-bone fracture (upper or lower extremity) or b) Non-ambulatory, characterized as being non-ambulatory for a minimum of 6 months with onset of non-ambulatory status defined as participant- or caregiver-reported age of continuous wheelchair use, approximated to the nearest month, and an North Star Ambulatory Assessment (NSAA) walk score of "0" and inability to perform the 10-Meter Walk/Run (10 MWR) at the baseline visit, with or without fractures * Group 2 participants are required to meet the following criteria: - Be fracture-naïve, defined as: no history of prior low-trauma fractures before the baseline visit nor any radiological findings indicative of prevalent VF at the screening visit - Be ambulatory defined as able to walk independently without assistive devices - Age ≥ 8 to \< 12 years old at the time of screening * Daily oral corticosteroids Key
Exclusion criteria
* Major surgery (e.g., spinal surgery) within 3 months prior to baseline or planned surgery or procedure that would interfere with the conduct of the study for any time during this study * Presence of any clinically significant illness * Has serological evidence of current, chronic, or active human immunodeficiency virus (HIV), tuberculosis (TB), hepatitis C virus (HCV), or hepatitis B virus (HBV) infection * Has a symptomatic infection (e.g., upper respiratory tract infection, pneumonia, pyelonephritis, meningitis) within 4 weeks prior to baseline * Body weight at screening \< 20 or \> 100 kilograms (kg) * Evidence of a severe VF (defined as Grade 3), assessed by radiographic imaging at screening and quantified using the Genant semiquantitative method * Treatment with prohibited therapies as defined by the protocol * Has received a live or live attenuated virus vaccine within 6 weeks of the baseline visit or expects to receive a live or live attenuated virus vaccine during the study * Has abnormal laboratory values considered clinically significant as defined by the protocol * Any medical condition that might interfere with the evaluation of LS BMD, such as severe scoliosis or spinal fusion * Participant has previous or ongoing medical condition, medical history, physical findings or laboratory abnormalities that could affect safety, make it unlikely that treatment and follow-up will be correctly completed or impair the assessment of study results, in the opinion of the investigator * Participant has an allergy or hypersensitivity to the study medication or to any of its constituents. Other protocol defined inclusion and
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Group 2: Change From Baseline to Week 24 in Lumbar Spine (LS) Bone Mineral Density (BMD) Z-score Measured by Dual-energy X-ray Absorptiometry (DEXA) | Baseline up to Week 24 | BMD of the LS is measured using DEXA. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Percentage of Participants With Adverse Events of Special Interest (AESIs) | Up to 90 weeks | — |
| Observed Serum Concentration of Satralizumab at Specified Trough Timepoints up to Study End | Up to 90 weeks | — |
| Apparent Clearance (CL) of Satralizumab | Up to 90 weeks | CL is a quantitative measure of the rate at which a drug substance is removed from the blood. |
| Apparent Volume of Distribution (Vd) of Satralizumab | Up to 90 weeks | Vd is defined as the theoretical volume in which the total amount of drug would need to be uniformly distributed to produce the desired plasma concentration of a drug. |
| Area Under the Concentration-time Curve (AUC) of Satralizumab | Up to 90 weeks | AUC from time zero to the last quantifiable concentration of satralizumab in plasma. |
| Percentage of Participants With Anti-drug Antibodies (ADAs) to Satralizumab at Baseline and During the Study | Up to 90 weeks | — |
| All Participants: Change From Baseline to Week 24 in LS BMD Z-score Measured by DEXA | Baseline up to Week 24 | — |
| Group 2: Change From Baseline to Week 24 in Total Body Less Head (TBLH) BMD Z-score Measured by DEXA | Baseline up to Week 24 | — |
| Group 2: Change From Baseline to Week 24 in Total Hip BMD Z-score Measured by DEXA | Baseline up to Week 24 | — |
| Percentage of Participants With Serious Adverse Events (SAEs) | Up to 90 weeks | An SAE is defined as any untoward medical occurrence that, at any dose: results in death; is life threatening; requires inpatient hospitalization or prolongation of existing hospitalization; results in persistent disability or incapacity; is a congenital anomaly or birth defect; is medically significant. |
| Percentage of Participants With Treatment-emergent Adverse Events (TEAEs) | Up to 90 weeks | An adverse event (AE) is any untoward medical occurrence in a clinical study participant temporally associated with the use of a study treatment, whether or not considered related to the study treatment. |
Countries
Denmark, Italy, Poland, Spain, Ukraine, United States
Contacts
STUDY_DIRECTORClinical Trials
Hoffmann-La Roche
Outcome results
None listed