Trastuzumab emtansine (Ado-Trastuzumab emtansine) is an antibody-drug conjugate (ADC) that combines the HER2-targeted antitumor properties of trastuzumab with the cytotoxic activity of DM1, a microtubule-inhibitory derivative of maytansine. This compound is utilized in the investigation of advanced breast cancer[1][2].