Safety, pharmacodynamics, and potential benefit of omaveloxolone in Friedreich ataxia.

Abstract:

Objective:Previous studies have demonstrated that suppression of Nrf2 in Friedreich ataxia tissues contributes to excess oxidative stress, mitochondrial dysfunction, and reduced ATP production. Omaveloxolone, an Nrf2 activator and NF-kB suppressor, targets dysfunctional inflammatory, metabolic, and bioenergetic pathways. The dose-ranging portion of this Phase 2 study assessed the safety, pharmacodynamics, and potential benefit of omaveloxolone in Friedreich ataxia patients (NCT02255435). Methods:Sixty-nine Friedreich ataxia patients were randomized 3:1 to either omaveloxolone or placebo administered once daily for 12 weeks. Patients were randomized in cohorts of eight patients, at dose levels of 2.5-300 mg/day. Results:Omaveloxolone was well tolerated, and adverse events were generally mild. Optimal pharmacodynamic changes (noted by changes in ferritin and GGT) were observed at doses of 80 and 160 mg/day. No significant changes were observed in the primary outcome, peak work load in maximal exercise testing (0.9 ± 2.9 W, placebo corrected). At the 160 mg/day dose, omaveloxolone improved the secondary outcome of the mFARS by 3.8 points versus baseline (P = 0.0001) and by 2.3 points versus placebo (P = 0.06). Omaveloxolone produced greater improvements in mFARS in patients that did not have musculoskeletal foot deformity (pes cavus). In patients without this foot deformity, omaveloxolone improved mFARS by 6.0 points from baseline (P < 0.0001) and by 4.4 points versus placebo (P = 0.01) at the 160 mg/day. Interpretation:Treatment of Friedreich ataxia patients with omaveloxolone at the optimal dose level of 160 mg/day appears to improve neurological function. Therefore, omaveloxolone treatment is being examined in greater detail at 150 mg/day for Friedreich ataxia.

journal_name

Ann Clin Transl Neurol

authors

Lynch DR,Farmer J,Hauser L,Blair IA,Wang QQ,Mesaros C,Snyder N,Boesch S,Chin M,Delatycki MB,Giunti P,Goldsberry A,Hoyle C,McBride MG,Nachbauer W,O'Grady M,Perlman S,Subramony SH,Wilmot GR,Zesiewicz T,Meyer C

doi

10.1002/acn3.660

subject

Has Abstract

pub_date

2018-11-10 00:00:00

pages

15-26

issue

1

issn

2328-9503

pii

ACN3660

journal_volume

6

pub_type

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