KHENERFIN Study: A Trial to Evaluate the Efficacy and Safety of Sonlicromanol in Primary Mitochondrial Diseases

The KHENERFIN study is investigating the medicine sonlicromanol. The study aims to see if sonlicromanol can reduce symptoms of fatigue and reduce the impact of fatigue on daily life. The study also investigates if sonlicromanol improves physical abilities like balance control and lower limb skeletal muscle strength in people with mitochondrial disease. In addition to these primary objectives, the study evaluates the efficacy of sonlicromanol on selected secondary and exploratory outcomes. It also assesses the safety and tolerability of sonlicromanol. This study is a placebo controlled, double blind study; the effects of sonlicromanol will be compared with a placebo (study medication that looks like the actual study medicine but contains no active medicine). Neither the participants nor the study team know who is receiving the study medicine or placebo. Participants cannot change their assigned rreatment. During the screening period, which lasts a maximum of 4 weeks, it is assessed whether the potential participant meets all requirements to participate in the study. Patients who complete the screening phase and are enrolled in the study are randomly (by chance) assigned to receive either the study medicine sonlicromanol or placebo (no active medication). Participants have an equal chance of receiving either sonlicromanol or a placebo. A final follow-up visit is scheduled 2 weeks after taking the last dose of study medication. Total study duration is approximately 60 weeks. Sonlicromanol will be supplied in tablet form, containing 90 mg of sonlicromanol (equivalent to 100 mg of sonlicromanol.HCl), with the tablets embossed accordingly or provided as a placebo. The study medication must be taken twice daily during the treatment period of 52 weeks. Up to 220 subjects with a confirmed mitochondrial DNA tRNALeu(UUR) 3243A\>G mutation will be randomly assigned in a 1:1 ratio to receive either sonlicromanol or placebo.