Weissenfels

Researchers are evaluating the patient-reported outcomes, real-world efficacy, and safety of trastuzumab deruxtecan (T-DXd) in patients with HER2-positive, HER2-low, or HER2-ultralow unresectable or metastatic breast cancer receiving treatment according to the approved product guidelines in routine clinical practice in Germany. This prospective, non-interventional, multicenter study includes approximately 800 patients divided equally into HER2-positive and HER2-low/ultralow groups. Patients will also be informed about the use of a digital healthcare application (DiGA). Eligible patients must be receiving T-DXd as part of their routine care, with all diagnostic tests and treatment visits determined by their treating physicians and not by the study protocol. The study observes patients treated with T-DXd in line with the applicable summary of product characteristics. Treatment decisions, including visit frequency and procedures, follow standard clinical practice rather than study-mandated schedules. Participants will be followed to monitor the time from the first dose of T-DXd until the start of the next treatment or death, assessed for up to 60 months. Data collection will include patient-reported outcomes, safety information, and real-world clinical data. The study aims to gather comprehensive information on treatment effects and patient experiences during routine care without altering their treatment plan.