Targeted drug shrinks tumors in 3 out of 4 patients with advanced breast cancer

There may be a promising new treatment on the horizon for advanced breast cancer patients, according to developing research.

Researchers are studying the cancer-killing drug trastuzumab rezetecan for those with ERBB2-low metastatic breast cancer, whose tumors have low levels of HER2, a protein that can help cancer cells grow.

A phase 3 clinical trial called HORIZON-Breast06 sought to determine whether the drug works better than standard chemotherapy for patients with this cancer type.