Arrowhead Pharmaceuticals(US:ARWR)2026-01-06 16:30ARO-INHBE Clinical Data - ARO-INHBE achieved a mean maximum reduction of 85% in serum Activin E after a single 400 mg dose, with a maximum observed reduction of 94%[80, 147] - ARO-INHBE monotherapy reduced visceral fat by 9.9% after a single dose at week 16 and 15.6% after two doses at week 24[82, 85, 147] - In obese diabetic patients, ARO-INHBE combined with tirzepatide doubled weight loss compared to tirzepatide alone, showing a 9.4% weight loss at week 16 versus 4.8% with tirzepatide alone[103, 105, 147] - Combination therapy with ARO-INHBE and tirzepatide in obese diabetic patients resulted in a 23.2% reduction in visceral fat, a 15.4% reduction in total fat, and a 76.7% reduction in liver fat, approximately a 3-fold improvement compared to tirzepatide alone across these measures[106, 107, 148] ARO-ALK7 Clinical Data - ARO-ALK7 demonstrated a mean reduction of 88% in ALK7 mRNA, confirming the TRiM platform's ability to silence adipocyte gene expression, with a maximum reduction of 94%[135, 148] - ARO-ALK7 showed a rapid dose-dependent reduction in visceral fat of up to 14% (placebo-adjusted) after a single dose[137, 148] General Summary - Both ARO-INHBE and ARO-ALK7 demonstrated favorable safety profiles in their respective monotherapy and combination therapy trials[113, 139] - The company plans to initiate Phase 2b studies as soon as possible and expand the obesity pipeline with new targets, including dimers[151] - Arrowhead's growth drivers in 2026 and beyond include potential multi-billion-dollar opportunity from Phase 3 studies of plozasiran in severe hypertriglyceridemia, first clinical readout of ARO-DIMER-PA targeting PCSK9 and APOC3 in 2H 2026, and emerging CNS pipeline with systemic delivery via SC administration[155]