Portalegre

Researchers are evaluating the effectiveness and safety of zanidatamab combined with a physician's choice of chemotherapy compared to trastuzumab combined with chemotherapy in treating adults with metastatic HER2-positive breast cancer. This study focuses on participants whose cancer has progressed or who cannot tolerate previous treatment with trastuzumab deruxtecan (T-DXd). The study is a phase 3 randomized trial aiming to assess progression-free survival and other important outcomes such as patient-reported tolerability and physical functioning. Participants receive either zanidatamab or trastuzumab through intravenous infusion, alongside chemotherapy drugs chosen by their physician from eribulin, gemcitabine, vinorelbine (all intravenous), or oral capecitabine. The study includes detailed monitoring of drug safety and how the body processes zanidatamab. The treatments continue until disease progression or unacceptable side effects occur. During the study, participants undergo regular evaluations including scans to measure cancer progression according to RECIST guidelines. Researchers also monitor safety through laboratory tests and heart function assessments. Participants are followed for up to approximately 44 months to measure progression-free survival and overall treatment outcomes. Long-term follow-up and patient-reported outcomes help provide a complete understanding of the treatments' effects.