Astellas will codevelop immunostimulatory antibody-drug conjugates (iADCs) for three biological targets through a partnership with Sutro Biopharma. Japanese biopharma firm Astellas will pay Californian biotech Sutro $90 million but could pay a further $422.5 million in development, regulatory and commercial milestones for each of the three undisclosed oncology candidates. While antibody-drug conjugates (ADCs) have established themselves on the commercial front, with 12 approved in the US, Sutro says its engineered iADCs are a potential groundbreaking modality in the treatment of…