Kelun-Biotech Biopharmaceutical Co. Ltd.’s trophoblast cell-surface antigen 2 (Trop2)-targeted antibody-drug conjugate (ADC), SKB-264, met the primary endpoint of progression-free survival (PFS) in a phase III trial in patients with unresectable locally advanced, recurrent or metastatic triple-negative breast cancer (TNBC), according to an interim analysis.