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Arrowhead Pharmaceuticals (ARWR) investor relations material
Arrowhead Pharmaceuticals Study Update summary
Complete event summary combining all related documents: earnings call transcript, report, and slide presentation.Key study findings
Interim phase I/II studies of ARO-INHBE and ARO-ALK7 in obese volunteers, including those with type 2 diabetes, show robust, dose-dependent target knockdown and significant reductions in visceral and liver fat, especially when combined with tirzepatide.
ARO-INHBE monotherapy achieved up to 85% mean and 94% max reduction in activin E, with up to 15.6% reduction in visceral fat and 38.6% reduction in liver fat; combination with tirzepatide led to 9.4% weight loss and 23.2% visceral fat reduction at 16 weeks, outperforming tirzepatide alone.
ARO-ALK7 demonstrated up to 94% ALK7 mRNA knockdown and 14.1% placebo-adjusted visceral fat reduction after a single dose, marking the first human proof of siRNA-mediated gene silencing in adipocytes.
Both agents were well tolerated as monotherapy and in combination with tirzepatide, with most adverse events mild, no discontinuations due to adverse events, and no significant lab abnormalities.
Combination therapy is particularly promising for obese diabetics, a group with high unmet need and less response to GLP-1 therapies, with early data suggesting additive or synergistic benefits.
Study design and rationale
Phase 1/2a studies evaluated ARO-INHBE and ARO-ALK7 in obese adults, with and without type 2 diabetes, as monotherapy and in combination with tirzepatide.
Key endpoints included safety, pharmacokinetics, changes in serum Activin E, body composition, liver fat, and glycemic parameters.
Both studies fully enrolled single and multiple ascending dose cohorts, with ongoing expansion and planning for Phase 2b.
Mechanism of action and genetic validation
ARO-INHBE targets hepatic INHBE to reduce Activin E, which regulates adipose lipolysis and is linked to insulin resistance and visceral fat accumulation.
ARO-ALK7 silences ALK7 in adipocytes, a receptor that suppresses lipolysis; genetic variants in ALK7 are associated with lower obesity and diabetes risk.
Both are RNAi-based therapeutics leveraging gene silencing for obesity and metabolic disease.
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