Ladiratuzumab (hLIV22) is a humanized monoclonal antibody against zinc transporter LIV-1/ZIP6. Ladiratuzumab is conjugated to MMAE via a cleavable dipeptide linker to synthesize an antibody-drug conjugate (ADC) Ladiratuzumab vedotin . Ladiratuzumab vedotin selectively targets LIV-1 protein overexpressed on the surface of tumor cells, enters cells through antibody-mediated receptor endocytosis, releases MMAE to inhibit microtubule polymerization, and kills adjacent tumor cells with a bystander effect. Ladiratuzumab can be used in the study of solid tumors such as metastatic triple-negative breast cancer (mTNBC).