Takeda and Arrowhead Collaborate to Co-Develop and Co-Commercialize ARO-AAT for Alpha-1 Antitrypsin-Associated Liver Disease

• Potential first-in-class therapy designed to treat the underlying cause of liver disease associated with AATD
• Arrowhead is eligible to receive up to $1.04B including an upfront payment of $300M and potential development, regulatory and commercial milestones up to $740M
• Investigational medicine ARO-AAT to be co-developed and co-commercialized in the United States by Takeda and Arrowhead under a 50/50 profit-sharing structure
• Takeda receives exclusive license to commercialize ARO-AAT outside the U.S.
• Arrowhead will hold a conference call and webcast today, Oct. 8, at 8:30 a.m. ET

(BUSINESS WIRE)-- Takeda Pharmaceutical Company Limited (TSE:4502/NYSE:TAK) (“Takeda”) and Arrowhead Pharmaceuticals Inc. (NASDAQ: ARWR) today announced a collaboration and licensing agreement to develop ARO-AAT, a Phase 2 investigational RNA interference (RNAi) therapy in development to treat alpha-1 antitrypsin-associated liver disease (AATLD). ARO-AAT is a potential first-in-class therapy designed to reduce the production of mutant alpha-1 antitrypsin protein, the cause of AATLD progression.

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Under the terms of the agreement, Takeda and Arrowhead will co-develop ARO-AAT which, if approved, will be co-commercialized in the United States under a 50/50 profit-sharing structure. Outside the U.S., Takeda will lead the global commercialization strategy and receive an exclusive license to commercialize ARO-AAT with Arrowhead eligible to receive tiered royalties of 20-25% on net sales. Arrowhead will receive an upfront payment of $300 million and is eligible to receive potential development, regulatory and commercial milestones up to $740 million. Closing of the transaction is contingent on completion of review under antitrust laws, including the Hart-Scott-Rodino (HSR) Antitrust Improvements Act of 1976 in the U.S.

“AAT-associated liver disease is a devastating condition for which there are no approved therapies. With its RNAi-based mechanism of action, ARO-AAT has the potential to treat the underlying cause of AATLD, thereby helping patients avoid the need for liver transplantation and associated co-morbidities,” said Asit Parikh, M.D., Ph.D., Head, Gastroenterology Therapeutic Area Unit at Takeda. “We are excited to collaborate with Arrowhead to bring forward this exciting late-stage liver asset for the Alpha-1 community as part of our growing GI portfolio.”

“Takeda’s global presence and experience with payers and regulators in the rare disease and GI therapy space, combined with its long history serving the Alpha-1 community make it the ideal partner for ARO-AAT. It is well-positioned to work with the patient and medical community to help meet the severe unmet need of patients with Alpha-1 liver disease,” said Christopher Anzalone, Ph.D., President and CEO at Arrowhead. “This agreement also supports our strategy of using partnering selectively to continue to invest in our Targeted RNAi Molecule (TRiM^TM) platform and the growing pipeline of RNAi therapeutics targeting diverse tissue types, while focusing our commercial organization on opportunities in two key areas of cardiometabolic and pulmonary.”

About Alpha-1 Antitrypsin-Associated Liver Disease

Alpha-1 Antitrypsin-Associated Deficiency (AATD) is a rare genetic disorder associated with liver disease in children and adults and pulmonary disease in adults. AATD is estimated to affect 1 per 3,000-5,000 people in the United States and 1 per 2,500 in Europe. The protein AAT is primarily synthesized and secreted by liver hepatocytes. Its function is to inhibit enzymes that can break down normal connective tissue. The most common disease variant, the Z mutant, has a single amino acid substitution that results in improper folding of the protein. The mutant protein cannot be effectively secreted and accumulates in globules inside the hepatocytes. This triggers continuous hepatocyte injury, leading to fibrosis, cirrhosis, and increased risk of hepatocellular carcinoma.

Individuals with the homozygous PiZZ genotype have severe deficiency of functional AAT leading to pulmonary disease and liver disease. Lung disease is frequently treated with AAT augmentation therapy. However, augmentation therapy does nothing to treat liver disease, and there is no specific therapy for hepatic manifestations. There is a significant unmet need as liver transplant, with its attendant morbidity and mortality, is currently the only available cure.

About ARO-AAT

ARO-AAT is designed to knock down the hepatic production of the mutant alpha-1 antitrypsin (Z-AAT) protein, the cause of progressive liver disease in AATD patients. Reducing production of the inflammatory Z-AAT protein is expected to halt the progression of liver disease and potentially allow it to regenerate and repair.

Takeda in Gastroenterology

We believe that GI and liver diseases are not just life disrupting conditions, but diseases that can impact a patient’s quality of life.^1,2 Beyond a fundamental need for effective treatment options, we understand that improving patients’ lives also depends on their needs being recognized. With nearly 30 years of experience in gastroenterology, Takeda has made significant strides in addressing GI patient needs with treatments for inflammatory bowel disease (IBD), acid-related diseases, short bowel syndrome (SBS), and motility disorders. We are making significant strides toward closing the gap on new areas of unmet needs for patients who have celiac disease, eosinophilic esophagitis, alpha-1 antitrypsin-associated liver disease, Crohn’s disease, and acute pancreatitis, among others. Together with researchers, patient groups and more, we are working to advance scientific research and clinical medicine in GI.

Arrowhead Conference Call and Webcast Information

Investors may access a live audio webcast on the Company's website at http://ir.arrowheadpharma.com/events.cfm. For analysts that wish to participate in the conference call, please dial 855-215-6159 or 315-625-6887 and provide Conference ID 1790033.

A replay of the webcast will be available on the company’s website approximately two hours after the conclusion of the call and will remain available for 90 days. An audio replay will also be available approximately two hours after the conclusion of the call and will be available for 3 days. To access the audio replay, dial 855-859-2056 or 404-537-3406 and provide Conference ID 1790033.

About Takeda Pharmaceutical Company Limited

Takeda Pharmaceutical Company Limited (TSE:4502/NYSE:TAK) is a global, values-based, R&D-driven biopharmaceutical leader headquartered in Japan, committed to bringing Better Health and a Brighter Future to patients by translating science into highly-innovative medicines. Takeda focuses its R&D efforts on four therapeutic areas: Oncology, Rare Diseases, Neuroscience, and Gastroenterology (GI). We also make targeted R&D investments in Plasma-Derived Therapies and Vaccines. We are focusing on developing highly innovative medicines that contribute to making a difference in people's lives by advancing the frontier of new treatment options and leveraging our enhanced collaborative R&D engine and capabilities to create a robust, modality-diverse pipeline. Our employees are committed to improving quality of life for patients and to working with our partners in health care in approximately 80 countries.

For more information, visit https://www.takeda.com.

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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 www.arrowheadpharma.com, or follow us on Twitter @ArrowheadPharma. To be added to the Company's email list and receive news directly, please visit http://ir.arrowheadpharma.com/email-alerts.

Arrowhead Safe Harbor Statement under the Private Securities Litigation Reform Act:

This news release contains forward-looking statements within the meaning of the "safe harbor" provisions of the Private Securities Litigation Reform Act of 1995. These statements are based upon our current expectations and speak only as of the date hereof. Our actual results may differ materially and adversely from those expressed in any forward-looking statements as a result of various factors and uncertainties, including the safety and efficacy of our product candidates, the duration and impact of regulatory delays in our clinical programs, our ability to finance our operations, the likelihood and timing of the receipt of future milestone and licensing fees, the future success of our scientific studies, our ability to successfully develop and commercialize drug candidates, the timing for starting and completing clinical trials, rapid technological change in our markets and the enforcement of our intellectual property rights. Our most recent Annual Report on Form 10-K and subsequent Quarterly Reports on Form 10-Q discuss some of the important risk factors that may affect our business, results of operations and financial condition. We assume no obligation to update or revise forward-looking statements to reflect new events or circumstances.

References:

¹ Center for Drug Evaluation and Research (CDER) & the FDA. The Voice of the Patient/Functional Gastrointestinal Disorder; 2016. https://www.fda.gov/media/95140/download

² Jones R, et al. Management of common gastrointestinal disorders: quality criteria based on patients’ views and practice guidelines. Br J Gen Pract. 2009; 59(563):e199-208.

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