In Akero Therapeutics’ Phase 2b HARMONY Study, Both the 50mg and 28mg EFX Doses Achieved Statistical Significance on Primary and Secondary Histology Endpoints after 24 Weeks
September 13 2022 - 06:00AM
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Akero Therapeutics, Inc. (Nasdaq: AKRO), a clinical-stage company developing transformational treatments for patients with serious metabolic disease marked by high unmet medical need, today released topline data from HARMONY, a 24-week Phase 2b study evaluating the efficacy and safety of its lead product candidate efruxifermin (EFX) in patients with pre-cirrhotic nonalcoholic steatohepatitis (NASH), fibrosis stage 2 or 3 (F2-F3). The study met its primary endpoint for both the 50mg and 28mg EFX dose groups, with 41% and 39% of EFX-treated patients, respectively, experiencing at least a one-stage improvement in liver fibrosis with no worsening of NASH by week 24, compared with 20% for the placebo arm.
The study also met a key secondary endpoint with 76% and 47% of patients treated with 50mg and 28mg, respectively, achieving NASH resolution without worsening of fibrosis, compared with 15% for placebo. In addition, 41% and 29% of patients treated with 50mg and 28mg, respectively, achieved both endpoints (NASH resolution and fibrosis improvement ≥1 stage), compared with 5% for placebo.
“The statistically significant histological improvements observed in the HARMONY study are among the strongest efficacy results reported in NASH to date and, together with strong results in secondary endpoints, show that EFX has the potential to treat the core facets of NASH,” said Stephen Harrison, M.D., medical director of Pinnacle Clinical Research and the HARMONY study’s principal investigator. “I believe the magnitude and general consistency of results observed across the Phase 2a BALANCED and Phase 2b HARMONY studies increase the probability of success in Phase 3 and position EFX to potentially be a foundational monotherapy for patients with NASH.”
Patients in the HARMONY study exhibited characteristics of patients at high risk of disease progression. The mean body weight across dose groups was approximately 105 kilograms. Roughly 70% of patients across dose groups had Type 2 diabetes as well as NASH. Approximately twice as many patients in the HARMONY study had fibrosis stage 3 (66%) as fibrosis stage 2 (34%). Despite these indicators of more advanced disease, the study also demonstrated statistically significant effects in multiple secondary endpoints in both dose groups, including improvements in liver fat, liver enzymes, non-invasive fibrosis markers, HbA1c, lipoproteins, and body weight. Treatment with EFX was generally well-tolerated, with a tolerability profile comparable to that observed in Akero’s Phase 2a BALANCED study.
“We believe today’s results from the HARMONY study are an important milestone not only for Akero but for the entire NASH community,” said Andrew Cheng, M.D., Ph.D., president and chief executive officer of Akero. “As the fastest growing cause of liver transplantation and liver cancer in the US and Europe, NASH represents a substantial and growing health burden. We believe the data are very compelling and show EFX’s potential to meet the critical, global unmet need for patients by intervening across stages of disease progression, potentially addressing both early-stage metabolic drivers and later-stage inflammation and fibrosis.”
Summary of Week 24 Biopsy Endpoints
Measure (Mean) Placebo
(N=41) 28mg
(N=38) 50mg
(N=34)
Improvement in at least one stage of fibrosis without worsening NASH (%) 20 39 * 41 *
Resolution of NASH without worsening of fibrosis (%) 15 47 ** 76 ***
NASH resolution AND improvement in at least one stage of fibrosis (%) 5 29 ** 41 ***
* p<0.05, ** p<0.01, *** p<0.001, versus placebo (Cochran-Mantel-Haenszel test)
Biopsy scored independently by two pathologists; third available to adjudicate was not needed
Summary of Week 24 Changes in Liver Fat and Key Markers of Fibrosis and Liver Injury
Measure (LS Mean Change From Baseline to Week 24) Placebo
(N=40-42) 28mg
(N=35-38) 50mg
(N=34-36)
Hepatic Fat Fraction (MRI-PDFF) (%) -6 -52 *** -64 ***
ALT (%) -4 -38 *** -47 ***
AST (%) -2 -39 *** -49 ***
Pro-C3 (µg/L) +0.1 -5.1 *** -5.2 ***
ELF Score +0.1 -0.6 *** -0.7 ***
Liver Stiffness (kPa) (FibroScan) -0.7 -2.6 † -4.3 **
** p<0.01, *** p<0.001, versus placebo (ANCOVA [Fat Fraction, Liver Stiffness]; MMRM [other endpoints])
† p<0.05, versus baseline (MMRM)
Summary of Key Cardio-Metabolic Biomarkers
Measure (LS Mean Change From Baseline) Placebo
(N=42) 28mg
(N=35-37) 50mg
(N=35-36)
HbA1c (%, absolute) -0.0 -0.3 † -0.4 *
Triglycerides (%) +9 -25 *** -29 ***
HDL Cholesterol (%) -2 +24 *** +30 ***
Non-HDL Cholesterol (%) +8 -13 *** -13 ***
LDL Cholesterol (%) +9 -8 ** -8 **
Body Weight (kg) -0.6 -0.2 -2.9 ††
* p<0.05, ** p<0.01, *** p<0.001, versus placebo (MMRM)
† p<0.05, †† p<0.01, versus baseline (MMRM)
EFX was reported to be generally well tolerated. Across both dose groups, the most frequent adverse events (AEs) were grade 1 or 2 gastrointestinal events (diarrhea, nausea, increased appetite, and frequent bowel movements), which were transient in nature. A total of five patients treated with EFX were discontinued due to AEs (two in the 28mg group and three in the 50mg group, one of which was reported to be unrelated to study drug), compared with none for placebo. A single drug-related serious adverse event (SAE) of esophagitis was experienced by a patient in the 50mg group who had a history of gastroesophageal reflux disease. Three other SAEs were reported as unrelated to study drug.
In July of 2021, Akero initiated the SYMMETRY study, a Phase 2b trial in biopsy-confirmed NASH patients with compensated cirrhosis (F4), Child-Pugh class A. Based on enrollment to date, Akero expects to report results from the ongoing Phase 2b SYMMETRY study in the second half of 2023. Results from a 12-week expansion cohort of the SYMMETRY study, evaluating treatment of EFX on top of GLP-1 therapy in patients with F1-F3 fibrosis, are expected in the first half of 2023.
Conference Call / Webcast Details
Akero will host a conference call and webcast with slide presentation at 8:00 a.m. ET today. The live webcast will be available on the Events & Presentations page of the Akero website, with the recording and presentation available immediately following the event.
About NASH
NASH (non-alcoholic steatohepatitis) is a serious form of NAFLD (non-alcoholic fatty liver disease) that is estimated to affect 17 million Americans. NASH is characterized by an excessive accumulation of fat in the liver that causes stress and injury to liver cells, leading to inflammation and fibrosis, which can progress to cirrhosis, liver failure, cancer and eventually death. There are no approved treatments for the condition and NASH is the fastest growing cause of liver transplants and liver cancer in the US and Europe.
About the HARMONY Study
The Phase 2b HARMONY study is a multicenter, randomized, double-blind, placebo-controlled, dose-ranging trial in biopsy-confirmed adult NASH patients with fibrosis stage 2 or 3. The study enrolled a total of 128 patients, randomized to receive once-weekly subcutaneous dosing of 28mg or 50mg EFX, or placebo for 24-weeks. The primary efficacy endpoint for the study is the proportion of subjects who achieve at least a one-stage improvement in fibrosis without worsening of
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