In a deal that could bring the company as much as $1.04 billion, Arrowhead Pharmaceuticals Inc. will collaborate with Takeda Pharmaceutical Co. Ltd. to co-develop and co-commercialize an investigational RNAi-based liver disease treatment. Arrowhead’s candidate, ARO-AAT, is designed to reduce mutant alpha-1 antitrypsin protein production, which causes the disease to progress. Arrowhead will receive a $300 million up-front payment on closing in addition to development, regulatory and commercial milestones that could total $740 million.