A unique antibody drug conjugate (ADC), which delivers a high dose of a cancer-killing drug to tumor cells through a targeted antibody, has been found in a global phase 3 clinical study to nearly double the survival time of patients with refractory metastatic triple-negative breast cancer. The study of the ADC drug sacituzumab govitecan (SG), for which Massachusetts General Hospital (MGH) was a lead clinical research site after serving as the lead site for the pivotal phase 1/2 trial, reported superior outcomes compared to single-agent chemotherapy, the standard for treating metastatic triple-negative breast cancer. The phase 3 results of the study, known as ASCENT, were published in the New England Journal of Medicine.