Luckenwalde

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.