If you are referring to the MMPOWER-3 trial:
Background As previously published, the MMPOWER-3 clinical trial did not demonstrate a significant benefit of elamipretide treatment in a genotypically diverse population of adults with primary mitochondrial myopathy (PMM). However, the prespecified subgroup of subjects with disease-causing...
ojrd.biomedcentral.com
"Post hoc analyses indicated that elamipretide had a beneficial effect in PMM patients with mtDNA replisome disorders, underscoring the importance of considering specific genetic subtypes in PMM clinical trials. These data serve as the foundation for a follow-up Phase 3 clinical trial (NuPOWER) which has been designed as described in this paper to determine the efficacy of elamipretide in patients with mtDNA maintenance-related disorders."
Human studies of SS-31 with good results:
"Treatment of explanted human hearts with elamipretide [SS-31] improves human cardiac mitochondrial function."
"During PTRA, patients were assigned randomly to either elamipretide (0.05 mg/kg per hour, n=6) or identically prepared placebo (n=8) infusion, which started 30 minutes before PTRA."
"Adjunctive elamipretide during PTRA was associated with attenuated postprocedural hypoxia, increased RBF, and improved kidney function in this pilot trial. These data support a role for targeted mitochondrial protection to minimize procedure-associated ischemic injury and to improve outcomes of revascularization for human atherosclerotic renal artery stenosis."
Similarly, a dog study with good results for heart failure:
"Long-term therapy with elamipretide improves LV systolic function, normalizes plasma biomarkers, and reverses mitochondrial abnormalities in LV myocardium of dogs with advanced HF. The results support the development of elamipretide for the treatment of HF."