Portalegre

This research aims to evaluate the effectiveness and safety of zanidatamab combined with a physicians choice of chemotherapy compared to trastuzumab combined with chemotherapy in treating adults with metastatic HER2-positive breast cancer who have either progressed on or cannot tolerate previous trastuzumab deruxtecan T-DXd treatment. Zanidatamab has shown promising results against various HER2-positive advanced tumors, including metastatic breast cancer, and may serve as a potential treatment option for these patients. The study also investigates patient-reported tolerability and physical functioning, as well as the pharmacokinetics and immune response to zanidatamab with chemotherapy. Participants will be randomly assigned to receive either zanidatamab or trastuzumab, each given by intravenous infusion alongside one of several chemotherapy options chosen by the physician eribulin, vinorelbine, gemcitabine, or capecitabine the latter is taken orally. Treatment will be administered according to the assigned group, and the study is open-label and multicenter, designed to compare these two treatment combinations in this patient population. During the study, participants will undergo regular assessments to monitor disease progression using imaging criteria RECIST version 1.1, evaluate survival, treatment response, and duration of response. Safety and side effects will be tracked through adverse event reporting and patient questionnaires on symptoms and physical function. Blood samples will be collected to study drug levels and immune reactions. Participants will be followed until disease progression, death, or for up to approximately 44 months for key outcomes, with overall survival monitored for up to about 80 months.