Comprehensive data on patient history and follow-up modalities, AEs and outcome will be collected as ePRO to provide high-quality reports and quantitatively abundant data provided by patients. In particular, prospectively collected data shall be compared to previously collected ePRO from women treated for HER2-positive BC in a variety of indications and settings . Since a large number of data entries for wellbeing and symptom reporting (according to CTCAE) is available from these patients, the investigators will refer to this as a historic registry data warehouse. Accordingly, the ePRO from these patients treated for HER2 positive BC are available for planned comparative analysis and shall be applied to indicate differences in anti-HER2 directed medication between Ogivri and Herceptin.
