TACSTD2 and Familial prostate cancer: Trophoblast cell surface antigen 2 (Trop-2) is overexpressed in prostate cancer, particularly in metastatic forms.<h4>Methods</h4>Response to this, we developed a novel Trop-2-targeted antibody-drug conjugate (ADC), SHR-A1921, which incorporates a potent DNA topoisomerase I inhibitor,SHR9265.