Long-Term Safety Extension Study of ACTIMMUNE® (Interferon γ-1b) in Children and Young Adults With Friedreich's Ataxia

Study Overview
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Brief Summary
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The purpose of this long term extension study is to evaluate the long-term safety of ACTIMMUNE® (interferon-γ 1b) in participants with Friedreich's Ataxia (FA).

Detailed Description
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This is a multi-center, open-label, long-term safety extension study of ACTIMMUNE® in the treatment of FA in children and young adults. Participants who complete 26 weeks of treatment and the Week 28 Follow-Up Visit in HZNP-ACT-302 (NCT02593773) will be eligible to enter this long-term safety extension protocol. The Day 1 Visit of this study (HZNP-ACT-303) occurs on the same day as the Week 28 Follow-Up Visit for HZNP-ACT-302 (NCT02593773). Participants will be required to return for clinic visits at least every 6 months. The treatment duration is open-ended, and treatment will continue until ACTIMMUNE® is commercially available for the treatment of FA in the United States or until the Sponsor decides not to continue development for the treatment of FA.

Official Title
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Long-Term Safety Extension Study of ACTIMMUNE® (Interferon γ-1b) in Children and Young Adults With Friedreich's Ataxia

Conditions
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Friedreich's Ataxia

Intervention / Treatment
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* Drug: interferon γ-1b


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Written informed consent and child assent, if applicable. Completed 26 weeks of treatment and the Week 28 Follow-Up visit in Study HZNP-ACT-302 (NCT02593773). If female, the subject is not pregnant or lactating or intending to become pregnant during the study, or within 30 days after the last dose of study drug. Female subjects of child-bearing potential must have a negative urine pregnancy test result at Week 26 of Study HZNP-ACT-302 (NCT02593773) and agree to use a reliable method of contraception throughout the study and for 30 days after the last dose of study drug. Exclusion Criteria: If in the opinion of the Investigator, patients have a concomitant disease or condition that could interfere with the conduct of the study or potentially put the subject at unacceptable risk, the subject will be excluded from the study.

Ages Eligible for Study
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Minimum Age: 11 Years
Maximum Age: 27 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: interferon γ-1b<br>ACTIMMUNE® will be administered 3 times per week (TIW) by subcutaneous (SC) injection. | Drug: interferon γ-1b<br>* ACTIMMUNE® will be administered three times per week by subcutaneous injection. The initial dose will be individualized for each participant and will be determined by the investigator, provided that the initial dose does not exceed the maximum tolerated dose in HZNP-ACT-302 (NCT02593773). The investigator may subsequently adjust the dose for any participant if deemed clinically appropriate, provided that the dose does not exceed 100 μg/m².<br>* Other names: ACTIMMUNE®;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Number of Participants With Treatment-Emergent Adverse Events (AEs), Serious Adverse Events (SAEs), and Discontinuations Due to AEs | An adverse event (AE) is any untoward medical occurrence, whether or not the event is considered related to the investigational product. A TEAE is any adverse change from the subject's baseline condition, including any laboratory test value abnormality judged as clinically significant by the investigator, that occurs on or after the date of the first dose of study drug administered at home and throughout the duration of the clinical study, whether the adverse event is considered related to the treatment or not. A serious AE (SAE) is an AE that results in death, is life-threatening, results in persistent or significant disability or incapacity, inpatient hospitalization or prolongation of an existing hospitalization, is a congenital anomaly or birth defect, or other medically important event. | Baseline/Day 1 (Week 28 Follow-Up Visit for Study HZNP-ACT-302 ([NCT02593773]) through end of study; mean (SD) duration of treatment was 99.2 (58.48) days. | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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ACTIMMUNE, interferon y-1b