An Austrian study led by MedUni Vienna showed that active brain metastases in breast cancer patients are partially or even completely regressed by a novel class of drug. This is a chemical conjugate of an antibody and a chemotherapy drug that, according to current findings, opens up a completely new avenue in oncological research and targeted therapy. The study results were published in the journal Nature Medicine and are considered ground-breaking in the treatment of brain metastases, a dreaded complication of cancer.