Friedreich's Ataxia clinical trials at University of California Health

The primary objective of this study is to assess the long-term safety of vatiquinone in participants with Friedreich ataxia (FA) previously exposed to vatiquinone.

Friedreich's ataxia is an autosomal recessive cerebellar ataxia caused by triplet-repeat expansions. The causative mutation is a trinucleotide (GAA) repeat expansion in the first intron of the frataxin gene, leading to impaired transcription of frataxin. The pathological consequences of frataxin deficiency include a severe disruption of iron-sulfur cluster biosynthesis, mitochondrial iron overload coupled to cellular iron dysregulation, and an increased sensitivity to oxidative stress. A hallmark of Friedreich's ataxia is impairment of antioxidative defense mechanisms, which play a major role in disease progression. Studies have demonstrated that nuclear factor erythroid-derived 2-related factor 2 (Nrf2) signaling is grossly impaired in participants with Friedreich's ataxia. Therefore, the ability of omaveloxolone (RTA 408) to activate Nrf2 and induce antioxidant target genes is hypothesized to be therapeutic in participants with Friedreich's ataxia. This 2-part study will evaluate the efficacy, safety, and pharmacodynamics of omaveloxolone (RTA 408) in the treatment of participants with Friedreich's ataxia. Part 1: The first part of this study will be a randomized, placebo-controlled, double-blind, dose-escalation study to evaluate the safety of omaveloxolone (RTA 408) at various doses in participants with Friedreich's ataxia. Part 2: The second part of this study is a randomized, placebo-controlled, double-blind, parallel-group study to evaluate the safety and efficacy of omaveloxolone (RTA 408) 150 mg in participants with Friedreich's ataxia. Participants enrolled in Part 2 will be randomized 1:1 to receive omaveloxolone (RTA 408) 150 mg or placebo. Extension: The extension will assess long-term safety and tolerability of omaveloxolone (RTA 408) in qualified participants with Friedreich's ataxia following completion of Part 1 or Part 2. Participants will not be unblinded to study treatment in Part 1 or Part 2 upon entering the extension study. Participants will receive open-label omaveloxolone (RTA 408) at 150 mg once daily.

In this study, researchers will learn more about the safety of BIIB141, also known as omaveloxolone or SKYCLARYS®. This is a drug available for doctors to prescribe for people with Friedreich's Ataxia, also known as FA. This is known as an "observational" study, which collects health information about study participants without changing their medical care. Participants for this study will be found using a group called the Friedreich's Ataxia Global Clinical Consortium (FA GCC). This is a group of study research centers that help provide clinical care for people with FA. The main objective of this study is to collect safety information in participants with FA who are being prescribed BIIB141 for the first time by their own doctors. The main question researchers want to answer in this study is: How many participants had serious adverse events (SAEs)? An adverse event is considered serious when it results in death, is life-threatening, causes lasting problems, or requires hospital care. How many participants had adverse events (AEs) related to heart failure or liver damage caused by the drug? Researchers will also learn more about : • Why and when participants stopped treatment, left the study, or took more of the drug than was prescribed This study will be done as follows: - Participants will be screened to check if they can join the study. - After joining the study, the participants must start treatment with BIIB141 within 6 months. - During the study, each participant's doctor will decide how often the participant visits the study research center to check on their health. This will be based on the doctor's own clinical judgment and what is recommended by the drug's label. Most participants will visit their study research center at least once a year. - Data from the participants' regular visits to their doctor will be collected at 1 month, 2 months, 3 months, 6 months, 12 months, 24 months, 36 months, 48 months, and 60 months. - Each participant will be in the study for up to 5 years.