This clinical trial is focused on studying a type of breast cancer known as HER2-positive non-resectable locally advanced or metastatic breast cancer. The study is investigating the effectiveness and safety of a combination of treatments, which includes the medications Trastuzumab, Tucatinib, and Vinorelbine. These medications are being tested together to see how well they work in treating this specific type of breast cancer.
The purpose of the study is to evaluate how effective this combination of medications is in treating the cancer. Participants in the study will receive the combination of these medications, and some may receive a placebo. The study will monitor the participants over a period of time to observe the response of the cancer to the treatment. This includes looking at how the cancer shrinks or grows, and how long the effects of the treatment last. The study will also assess the safety of the treatment by monitoring any side effects that participants may experience.
Throughout the study, participants will undergo various assessments, including imaging tests like MRI to check for any changes in the cancer, especially in the brain if there are concerns about metastasis, which is when cancer spreads to other parts of the body. The study aims to provide valuable information on the potential benefits and risks of using this combination of medications for treating HER2-positive breast cancer.



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