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Researchers are studying pre- and perimenopausal women with estrogen- and/or progesterone-receptor-positive, HER2-negative early breast cancer who have an intermediate to high clinical risk but low genomic risk of recurrence based on MammaPrint4 testing. The study aims to understand the real-world use of ovarian function suppression (OFS) combined with endocrine therapy, with or without prior chemotherapy, and how secondary amenorrhea after chemotherapy might affect outcomes. It also focuses on treatment adherence and quality of life over time, given the importance of long-term endocrine treatment up to 10 years. The registry will follow patients receiving standard-of-care treatment, which may include endocrine therapy with or without ovarian function suppression, and potentially chemotherapy based on clinical decisions. Data on treatment choices, including the use of OFS and chemotherapy, will be collected along with tumor characteristics assessed by local pathology and genomic signatures. Quality of life assessments will be conducted at baseline and multiple time points up to five years, while treatment adherence and outcomes will be tracked over up to 10 years. Participants will provide baseline information including tumor and treatment details. Researchers will collect follow-up data on treatment adherence, quality of life using specific questionnaires, and disease outcomes such as the five-year distant recurrence-free interval. Monitoring will include hormonal status and clinical assessments to correlate treatment effects with genomic risk scores and clinical markers. The overall goal is to improve understanding of treatment patterns and outcomes in this specific breast cancer population under real-world conditions.

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.