Lack of Concentration-QTc Relationship and Cardiac Risk With Vatiquinone Therapeutic and Supratherapeutic Doses.

Vatiquinone, a 15-lipoxygenase inhibitor, is in development for patients with Friedreich ataxia. The study determined the effect of vatiquinone on electrocardiogram parameters. This was a 2-part, single-center, randomized, double-blinded, and placebo-controlled study. Part 1 used an adaptive approach to identify a supratherapeutic dose, while Part 2 evaluated the effect of vatiquinone on Fridericia corrected QT interval (QTcF). A safe and tolerated supratherapeutic dose of 1400 mg was identified. Concentration-QTcF analysis confirmed there was no statistically significant relationship between vatiquinone concentration and QTcF. QTcF effect (ie, ΔΔQTcF) exceeding 10 milliseconds was excluded for concentrations up to approximately 11,500 ng/mL. By-time-point analysis confirmed that least-squares mean ΔΔQTcF was below 10 milliseconds. Largest least-squares mean ΔΔQTcF of 1.5 milliseconds was observed at 2 hours after dosing. Vatiquinone did not have a clinically relevant effect on heart rate nor on cardiac conduction (PR interval and QRS interval). No new safety signals were found, as safety data are consistent with the known safety profile of vatiquinone. These findings altogether demonstrated that there is a minimal cardiac risk for vatiquinone concentrations up to the supratherapeutic dose level.