Author information

• ¹Pinnacle Clinical Research, San Antonio, TX, USA. Electronic address: sharrison@pinnacleresearch.com.
• ²Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Hong Kong, Hong Kong, China.
• ³Saiseikai Suita Hospital, Suita City, Osaka, Japan.
• ⁴Oschner Medical Center, New Orleans, LA, USA.
• ⁵Indiana University School of Medicine, Indianapolis, IN, USA.
• ⁶Gastro One, Germantown, TN, USA.
• ⁷The Institute for Liver Health, Chandler, AZ, USA.
• ⁸Institute of Liver and Biliary Sciences, New Delhi, India.
• ⁹University of Virginia, Charlottesville, VA, USA.
• ¹⁰Texas Liver Institute, University of Texas Health San Antonio, TX, USA.
• ¹¹Liver Institute of Virginia, Bon Secours Mercy Health, Richmond, VA, USA.
• ¹²Gilead Sciences, Inc., Foster City, CA, USA.
• ¹³Pinnacle Clinical Research, Austin, TX, USA.
• ¹⁴GI Specialists of Georgia, Marietta, GA, USA.
• ¹⁵Institute of Cellular Medicine, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne, UK & Newcastle NIHR Biomedical Research Center, Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK.
• ¹⁶Hospital Universitario Virgen del Rocio, Sevilla, Spain.
• ¹⁷Division of Gastroenterology and Hepatology, Medical University of Vienna, Austria.
• ¹⁸Inova Fairfax Hospital, Falls Church, VA, USA.

Abstract

Background & aims: Apoptosis signal-regulating kinase 1 (ASK1) plays a key role in hepatocyte injury, inflammation, and fibrosis in non-alcoholic steatohepatitis (NASH). We evaluated the safety and antifibrotic effect of selonsertib, a selective inhibitor of ASK1, in patients with advanced fibrosis due to NASH.

Methods: We conducted 2 randomized, double-blind, placebo-controlled, phase III trials of selonsertib in patients with NASH and bridging fibrosis (F3, STELLAR-3) or compensated cirrhosis (F4, STELLAR-4). Patients were randomized 2:2:1 to receive selonsertib 18 mg, selonsertib 6 mg, or placebo once daily for 48 weeks. Liver biopsies were performed at screening and week 48 and non-invasive tests of fibrosis (NITs) were evaluated. The primary efficacy endpoint was the proportion of patients with ≥1-stage improvement in fibrosis without worsening of NASH at week 48. Additional endpoints included changes in NITs, progression to cirrhosis (in STELLAR-3), and liver-related clinical events.

Results: Neither trial met the primary efficacy endpoint. In STELLAR-3, fibrosis improvement without worsening of NASH was observed in 10% (31/322, p = 0.49 vs. placebo), 12% (39/321, p = 0.93 vs. placebo), and 13% (21/159) of patients in the selonsertib 18 mg, selonsertib 6 mg, and placebo groups, respectively. In STELLAR-4, the primary endpoint was achieved in 14% (51/354; p = 0.56), 13% (45/351; p = 0.93), and 13% (22/172) of patients, respectively. Although selonsertib led to dose-dependent reductions in hepatic phospho-p38 expression indicative of pharmacodynamic activity, it had no significant effect on liver biochemistry, NITs, progression to cirrhosis, or adjudicated clinical events. The rates and types of adverse events were similar among selonsertib and placebo groups.

Conclusions: Forty-eight weeks of selonsertib monotherapy had no antifibrotic effect in patients with bridging fibrosis or compensated cirrhosis due to NASH.

Lay summary: Patients with non-alcoholic steatohepatitis (NASH) can develop scarring of the liver (fibrosis), including cirrhosis, which increases the risks of liver failure and liver cancer. We tested whether 48 weeks of treatment with selonsertib reduced fibrosis in patients with NASH and advanced liver scarring. We did not find that selonsertib reduced fibrosis in these patients.

Trial registration details: Clinicaltrials.gov numbers NCT03053050 and NCT03053063.