Arrowhead Pharmaceuticals is a biopharmaceutical company developing targeted RNAi therapeutics.
Targeting Innovation
Arrowhead Pharmaceuticals develops novel drugs to treat intractable diseases by silencing the genes that cause them. Using the broadest 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. Arrowhead’s most advanced drug candidate in clinical development is ARC-520, which is designed to treat chronic hepatitis B infection by inhibiting the production of all HBV gene products. The goal is to reverse the immune suppression that prevents the body from controlling the virus and clearing the disease. Arrowhead’s second clinical candidate is ARC-AAT, a treatment for a rare liver disease associated with a genetic disorder that causes alpha-1 antitrypsin deficiency.
Lead Products
ARC-520 is an RNAi-based therapeutic designed to treat chronic hepatitis B virus (HBV) infection. It is the first clinical-stage drug candidate from Arrowhead’s Dynamic Polyconjugate® delivery platform. It is designed to treat chronic HBV infection by reducing the expression and release of new viral particles and key viral proteins with the goal of achieving a functional cure for HBV.
ARC-AAT is a novel unlocked nucleobase analog (UNA)-containing RNAi-based therapeutic for the treatment of liver disease associated with Alpha-1 Antitrypsin Deficiency (AATD), a rare genetic disease that can severely damage the liver and lungs of affected individuals. The goal of treatment with ARC-AAT is to reduce the production of the mutant Z-AAT protein to prevent and potentially reverse accumulation-related liver injury and fibrosis.
The companys pre-clinical stage drug candidates include ARC-521, an RNAi-based therapeutic for the treatment of chronic hepatitis B virus; ARC-F12, an RNAi-based therapeutic to treat hereditary angioedema and thromboembolic diseases; ARC-HIF2, an RNAi-based therapeutic to treat renal cell carcinoma; and ARC-LPA, an RNAi-based therapeutic for the treatment of cardiovascular diseases. It also holds patents related to Adipotide for the treatment of obesity and related metabolic disorders. The company has research collaboration and license agreement with Shire AG to develop and commercialize targeted peptide-drug conjugates.
Platform Delivery Technology
The Dynamic Polyconjugate (DPC®) platform is an RNAi delivery system that has been demonstrated to preferentially deliver to hepatocytes, induce efficient endosomal escape, promote high levels of gene knockdown in multiple animal models, and appears to be well tolerated using a variety of RNAi trigger molecules. It is a modular system that can be optimized on a target-by-target basis and may be targeted in the future to address multiple organ systems and cell types.
Pipeline Development Strategy
Arrowhead’s internal drug pipeline is intended to drive value directly through the clinical development of novel therapeutics and to provide proof of concept for our platform technologies. In addition to our two lead product candidates, ARC-520 and ARC-AAT, we intend to nominate additional clinical candidates that utilize the DPC delivery system. Our core areas of focus for expanding our internal pipeline of RNAi therapeutics are: (1) develop intravenous (IV) administered liver-targeted candidates; (2) develop subcutaneously administered liver-targeted candidates; and (3) explore extra-hepatic targets, including oncology.
“In the poststatin and postgenomic era, finding much needed therapeutic targets for residual cardiovascular risk can be compared to a gold-digging expedition,” Arsenault concludes. “Like a map to the location of the gold, several genome-wide association studies and mendelian randomization studies are consistently pointing us in the direction of Lp(a). It is time to coordinate our efforts to dig where the map told us, to see once and for all, if we will find the golden target of residual cardiovascular risk that we are hoping for and to give hope to high-risk patients with elevated Lp(a) levels.”
The clinical relevance is that for people . . . with very marked elevations of Lp(a), it looks like that the antisense [oligonucleotides] would be beneficial, and even if you knocked the levels down 80% or 90%, you wouldn't actually get into the low levels where you might have some increased risk for diabetes,” Christie Ballantyne, MD (Baylor College of Medicine, Houston, TX), who was not involved in the study, told TCTMD.
Disclosures Gudbjartsson and Stefansson are employees of deCODE genetics, which is owned by the pharmaceutical company Amgen, which is currently developing Lp(a) lowering drugs aimed at decreasing coronary artery disease risk. Arsenault reports receiving support by a junior scholar award from the Fonds de recherche du Québec: Santé and the Canadian Institutes of Health Research; receiving research funding from Pfizer, Merck, and Ionis Pharmaceuticals; and serving as a consultant to Pfizer and Novartis. Ballantyne reports serving as a consultant to Amgen and as an investigator for both Amgen and Novartis trials in the Lp(a) space.