Efficacy and safety of an orally administered DGAT2 inhibitor alone or coadministered with a liver-targeted ACC inhibitor in adults with non-alcoholic steatohepatitis (NASH): rationale and design of the phase II, dose-ranging, dose-finding, randomised, placebo-controlled MIRNA (Metabolic Interventions to Resolve NASH with fibrosis) study.

Introduction: Small molecule inhibitors of the terminal step in intrahepatic triglyceride synthesis (diacylglycerol acyltransferase 2 inhibitor (DGAT2i, PF-06865571, ervogastat)) and upstream blockade of lipogenesis via acetyl-coenzyme A carboxylase inhibitor (ACCi, PF-05221304, clesacostat) showed promise in reducing hepatic steatosis in early clinical trials. This study assesses efficacy and safety of these metabolic interventions to resolve non-alcoholic steatohepatitis (NASH) with fibrosis.

Methods And Analysis: This phase II, randomised, dose-ranging, dose-finding study evaluates DGAT2i 25-300 mg two times per day (BID) or 150-300 mg once a day, DGAT2i 150-300 mg BID+ACCi 5-10 mg BID coadministration or matching placebo in a planned 450 adults with biopsy-confirmed NASH and liver fibrosis stages 2-3 from approximately 220 sites in 11 countries across North America, Europe and Asia. A triage approach including double-confirmation via non-invasive markers is included prior to screening/baseline liver biopsy. On confirmation of histological diagnosis, participants enter a ≥6-week run-in period, then a 48-week double-blind, double-dummy dosing period. The primary endpoint is the proportion of participants achieving histological NASH resolution without worsening fibrosis, ≥1 stage improvement in fibrosis without worsening NASH, or both, assessed by central pathologists. Other endpoints include assessment of hepatic steatosis (imaging substudy), overall safety and tolerability, and evaluation of blood-based biomarkers and quantitative ultrasound parameters over time.

Ethics And Dissemination: Metabolic Interventions to Resolve NASH with fibrosis (MIRNA) is conducted in accordance with the Declaration of Helsinki and Council for International Organisations of Medical Sciences (CIOMS) International Ethical Guidelines, International Council on Harmonisation Good Clinical Practice guidelines, applicable laws and regulations, including privacy laws. Local independent review board/ethics committees (IRB/ECs) review/approve the protocol, any amendments, informed consent and other forms. Participants provide written informed consent. Details of all IRB/ECs, as well as results, will be published in a peer-reviewed journal and publicly disclosed through ClinicalTrials.gov, EudraCT, and/or www.pfizer.com and other public registries as per applicable local laws/regulations.

Trial Registration Number: NCT04321031.