Enhertu Breast Cancer Drug Results in ‘Unheard-of’ Survival Rates June 7, 2022 Auto Bot American Society of Clinical Oncology, AstraZeneca PLC, breast cancer, chemotherapy, Cleveland Clinic, Clinical Trials, Memorial Sloan Kettering Cancer Center, New England Journal of Medicine, Research 0 For some patients with metastatic tumors not significantly affected by other forms of chemotherapy, the treatment halted their cancer’s growth.