How well does a new cancer drug work in advanced breast cancer patients

This trial is testing a medication called trastuzumab deruxtecan in people with advanced breast cancer. Researchers want to understand how well this treatment works and what side effects patients may experience. This is a real-world study, meaning it follows patients who are already planning to receive this medication as part of their standard cancer care.

While this medication has shown promise, doctors want to gather more information about how it performs in everyday clinical practice and in a broader range of patients. Understanding its real-world effectiveness and safety can help guide treatment decisions for future patients with advanced breast cancer.