Arrowhead Presents Positive Interim Clinical Data on ARO-HSD Treatment in Patients with Suspected NASH at EASL International Liver Congress
Pharmacodynamics and Efficacy
All five patients with suspected NASH showed a strong pharmacodynamic effect as measured by liver biopsy at Day 71. HSD17B13 mRNA was reduced by a mean of 84%, with a range of 62-96%. HSD17B13 protein was reduced by 83% or greater. Two patients had a protein decrease of 92% and 97%, while the other three patients’ Day 71 measurements were reduced to below the lower limit of quantitation.
Mean ALT reduction from baseline was 46%, with all patients showing reductions ranging from 26-53%. ARO-HSD is the first investigational RNAi therapeutic to demonstrate robust inhibition of hepatic HSD17B13 mRNA and protein expression with associated reductions in ALT.
Safety and Tolerability
ARO-HSD was well tolerated without any identified safety signals in healthy volunteers given a single dose of ARO-HSD at 25mg, 50mg, 100mg or 200 mg and in the 5 patients with suspected NASH given a single 100 mg dose of ARO-HSD on Days 1 and 29. Adverse events were similar between subjects receiving ARO-HSD or placebo. Two instances of mild injection site bruising and mild injection site erythema were observed in ARO-HSD treated subjects. There were no ARO-HSD associated grade 3 or 4 laboratory abnormalities (NCI-CTCAE v5.0), no drug related serious or severe adverse events, and there were no drug discontinuations.
AROHSD1001 (NCT04202354) is a Phase 1/2 single and multiple dose-escalating study to evaluate the safety, tolerability, pharmacokinetics, and pharmacodynamic effects of ARO-HSD in up to 74 normal healthy volunteers and patients with NASH or suspected NASH. Additional exploratory objectives include the assessment of various measures of drug activity using liver biopsy.
Title: ARO-HSD reduces hepatic HSD17B13 mRNA expression and protein levels in patients with suspected NASH
Type: Late-Breaking Poster
Date and Time:
A copy of the presentation materials may be accessed on the Events and Presentations page under the Investors section of the Arrowhead website. The abstract was also selected for inclusion in
HSD17B13 is a member of the hydroxysteroid dehydrogenase family involved in the metabolism of hormones, fatty acids, and bile acids. Published human genetic data indicate that a loss of function mutation in HSD17B13 provides strong protection against alcoholic hepatitis, cirrhosis, and NASH, with approximately 30-50% risk reduction compared to non-carriers.1
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