Sunrock Biopharma SL and Shanghai Escugen Biotechnology Co. Ltd. have joined forces in a strategic partnership to codevelop SRB-123, a first-in-class antibody-drug conjugate (ADC) targeting C-C motif chemokine receptor 9 (CCR9), a tumor-associated antigen overexpressed in multiple solid tumors, including pancreatic, ovarian and lung cancer.