Sutro Biopharma Inc. announced updates on its next-generation antibody-drug conjugate $(ADC)$ pipeline during a virtual R&D Day. The company has initiated a Phase 1 clinical study for STRO-004, a potential best-in-class Tissue Factor ADC, with initial data expected in mid-2026. Sutro also revealed STRO-227, its first dual-payload ADC candidate targeting PTK7, with an IND submission targeted for 2026/2027. Additionally, Sutro highlighted ongoing collaborations, including a partnership with Astellas on dual-payload immunostimulatory ADCs, with the first clinical program expected to begin in early 2026. The scientific research results and pipeline updates were presented during the event, which featured company leadership and external oncology experts.