PASADENA, CA, USA I February 18, 2022 I Arrowhead Pharmaceuticals Inc. (NASDAQ: ARWR) today announced that it has dosed the first subjects in AROC3-1001, a Phase 1/2 clinical study of ARO-C3, the company’s investigational RNA interference (RNAi) therapeutic designed to reduce production of complement component 3 (C3) as a potential therapy for various complement mediated diseases.

James Hamilton, M.D., MBA, senior vice president of discovery and translational medicine at Arrowhead, said: “We believe a C3 targeted drug has the potential to address multiple complement mediated and complement associated diseases, where significant unmet medical need exists. These include IgA nephropathy, C3 glomerulopathy, paroxysmal nocturnal hemoglobinuria, and additional renal and hematologic diseases that we intend to evaluate in the future. ARO-C3 has progressed rapidly, and our preclinical data have been very encouraging. We are eager to continue this progress as we evaluate ARO-C3 in clinical studies.”

AROC3-1001 (NCT05083364) is a Phase 1/2, placebo controlled, dose-escalating study to evaluate the safety, tolerability, pharmacokinetics, and pharmacodynamics of ARO-C3 in up to 24 adult healthy volunteers, up to 24 adult patients with paroxysmal nocturnal hemoglobinuria (PNH), and up to 14 adult patients with complement-mediated renal disease. In Part 1 in healthy volunteers, four cohorts with four escalating dose levels of ARO-C3 will be evaluated. Each cohort will enroll 6 eligible subjects who will be randomized to receive a single subcutaneous injection of ARO-C3 (n=4) or placebo (n=2). In Part 2, eligible subjects with PNH or complement-mediated renal disease will be enrolled to receive open-label ARO-C3 on day 1 and day 85 at one of two dose levels to be determined in Part 1. The primary objective of the study is to evaluate the safety, tolerability, pharmacokinetics, and pharmacodynamics of single doses of ARO-C3 in normal healthy volunteers and to evaluate the safety, tolerability, pharmacokinetics, and pharmacodynamics of multiple doses of ARO-C3 in subjects with PNH and in subjects with complement-mediated renal disease.

About Arrowhead Pharmaceuticals

Arrowhead Pharmaceuticals develops medicines that treat intractable diseases by silencing the genes that cause them. Using a broad portfolio of RNA chemistries and efficient modes of delivery, Arrowhead therapies trigger the RNA interference mechanism to induce rapid, deep, and durable knockdown of target genes. RNA interference, or RNAi, is a mechanism present in living cells that inhibits the expression of a specific gene, thereby affecting the production of a specific protein. Arrowhead’s RNAi-based therapeutics leverage this natural pathway of gene silencing.

For more information, please visit, or follow us on Twitter @ArrowheadPharma. To be added to the Company’s email list and receive news directly, please visit

SOURCE: Arrowhead Pharmaceuticals