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A drug repositioning effort provided evidence supporting the possible use of Etravirine, a drug approved for the treatment of HIV infections in patients starting from 2 years of age, as a treatment for FA. We found that Etravirine is able to increase Frataxin protein both in vitro - in cells derived from FA patients - and in vivo - in the heart and skeletal muscle of Frataxin-deficient YG8 mice. Because of these findings, and since Etravirine displays a generally favorable safety profile, we plan to launch an open-label, phase 2 clinical trial aimed at assessing the safety and efficacy of Etravirine in FA patients. We aim at recruiting 30 FA patients. 15 will be treated with Etravirine for 4 months at 200 mcg/day and 15 will be treated with Etravirine for 4 months at 400 mg/day. Efficacy primary endpoint will be represented changes in peak VO2 as measured by incremental cycle ergometer exercise test. Secondary endpoints will include maximal workload, SARA score, cardiac measures, Frataxin protein levels in peripheral blood mononuclear cells and molecular analysis of Frataxin mRNA translation efficiency. Complete sets of data will be collected 4 months before the start of the treatment (T -4), at the start (T0), after 2 months (T2), at the end of the treatment (T4) and 4 months after the termination of the treatment (T8).
Full description
Friedreich ataxia is a rare progressive neurodegenerative disease presenting in childhood or late adolescence for which no treatment is currently available. The disease is caused by the defective synthesis of Frataxin, a mitochondrial protein synthesized by the FXN gene. Over 95% of patients carry a homozygous intronic GAA expansion that impairs FXN gene transcription and translation. The persistence of an intact reading frame within the genome of most FRDA patients opens the way to treatment attempts that target FXN gene transcription and mRNA translation to increase endogenous Frataxin levels and balance the complex metabolic consequences of Frataxin deficiency. The disease is characterized by a relentless progression involving motor coordination (ataxia), heart function and structure (hypertrophic cardiopathy), exercise capacity (impaired bioenergetics with reduced aerobic capacity), endocrine function (diabetes) visual and auditory function (optic atrophy and hearing loss).
By screening a library of 853 FDA-approved drugs, we found a few drugs that are capable to upregulate Frataxin in vitro. Among them, we selected and focused on Etravirine for its generally favorable safety profile. In Friedreich ataxia (FRDA) patients-derived cells, we found that Etravirine upregulates mature Frataxin protein, enhances the activity of aconitase and confers resistance to oxidative stress. Etravirine appears to upregulate Frataxin protein by a mechanism of action involving the redistribution of frataxin mRNA on heavy polysomes and consequent enhancement of Frataxin mRNA translation. Moreover, in collaboration with Dr. Mark Pook, Brunel University, London, we obtained evidence that Etravirine is able to upregulate Frataxin protein in the heart and in the skeletal muscle of YG8 mice dosed orally for 5 days with Etravirine (unpublished).
Etravirine is a diarylpyrimidine that acts as a non-nucleoside reverse transcriptase inhibitor. It was approved in 2008 by the FDA (tradename Intelence) for the treatment of patients affected by HIV that are resistant to other drugs. In 2018 the label was extended to include patients 2 years of age and older. The FDA label reports no contraindications. Etravirine is administered orally in tablets.
Preliminary Results
In collaboration with Dr. Mark Pook, Brunel University, London, we tested whether Etravirine is able to upregulate Frataxin protein in tissues of YG8 mice. Five YG8 mice were dosed for 5 days orally with Etravirine (10 mg/Kg) and five YG8 mice were dosed for 5 days orally with vehicle. Four hrs after last dosing, all the mice were sacrificed and protein extracts prepared from tissues. SDS-PAGE followed by immunoblotting revealed that Frataxin protein was significantly increased in the heart and in the skeletal muscle of Etravirine-dosed mice, compared to vehicle-dosed mice.
Specific Aims
Because of its ability to upregulate Frataxin protein and rescue phenotypic defects in FA patient-derived cells and because of its safety and approved use in children, Etravirine represents an attractive potential therapeutic for FA. Aim of the study, therefore, will be assessing the safety and efficacy of Etravirine in a small population of young FA patients.
Experimental Plan Study design. The study will be a randomized open-label Phase 2 clinical trial, to investigate the safety and efficacy of Etravirine in FA patients.
Study population. We aim at enrolling 30 FA patients, aged 10 to 40 years over a period of 6 months. Enrollment will be done by advertising the study through the patients' associations and among FA patients currently followed at the Medea site (50 subjects at present time). The patients will be screened and evaluated in the tertiary care hospital setting where Dr Martinuzzi is active. Treatment will be carried on at home following the prescription given to the patients at each visit.
Study Intervention. Recruited subjects will be randomized 1:1 by a computer-generated randomization sequence to either of the two dose regimens: Etravirine orally 200 mg/day (100 mg cpr x 2, morning and evening) for 4 months or Etravirine 400 mg/day (one 200 mg cpr x 2 morning and evening) for 4 months. Treatment will start only after the 4 months pre-treatment period will be completed and after the T0 evaluation visit.
Withdrawal criteria. Failure to comply with the study follow-up visits or with the treatment protocol. Occurrence of a SUSAR (suspected unexpected severe adverse reaction) deemed related to the drug treatment.
Stopping rules. The entire study will be interrupted: 1) When the third SUSAR occurs in different patients. 2) On the occurrence of the same SUSAR in two different patients. 3) Upon the occurrence of the first serious adverse event judged to be related to the investigational drug, which has endangered a patient's life or caused permanent damage. 4) Upon the exclusion of the third patient from the trial.
Endpoints
Secondary endpoints. Secondary endpoints will include:
Sample size calculation. Sample size was calculated considering the primary endpoint. VO2 at peak in controls subjects shows a value >16.2 with a test-retest variability of ± 4 ml/min/Kg. Workload at peak is expected to be >3W/Kg in control subjects with a SD of ± 0.8. This parameter is reduced by approximately 50% in FA patients with similar SD values. Considering an alpha error of 0.05 and a statistical power of 80%, the needed number of participants is 30.
Statistical analysis. Both primary and secondary endpoints will be analyzed using multivariate linear mixed models modeling timepoints as a repeated within-subject factor. Mixed models have the advantage of being able to account for heterogeneous distances between timepoints, missing data as well as unequal variances and covariances. In order to account for possible confounds due to inter-patient variability, all models will include sex, age at onset, disease duration, years of education and number of GAA1 repeats within the smaller FXN allele as covariates of no interest. When a statistically significant (p<0.05) overall effect of time is found, pairwise comparisons between timepoints were will be performed and corrected for multiple comparisons across pairs of timepoints using the Dunn-Šidák correction.
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30 participants in 2 patient groups
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Data sourced from clinicaltrials.gov
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