First-line Palbociclib and Endocrine Therapy for Patients With HR+/HER2- Advanced Breast Cancer in the Real-world Setting.

Patients diagnosed with HR+/HER2- locally advanced or metastatic breast cancer indicated by their treating physicians for first line endocrine-based palbociclib combination therapy and who meet eligibility criteria will be invited to participate in this study. The key objectives of this study are to describe clinical, scientific and patient reported outcomes for patients with HR+/HER2- locally advanced or metastatic breast cancer initiating treatment with first line endocrine-based palbociclib combination therapy in the real-world setting in Germany and Austria. Patient characteristics, real-world treatment patterns, treatment sequences and reasons for the physician's treatment decisions will be collected. Additional real-world research questions are to explore patient-focused parameters such as longitudinal follow-up data on patient-reported outcomes beyond disease progression and by treatment sequence or to analyze the time from the start of first line treatment to the first administered palliative chemotherapy. Clinical outcome by treatment sequences will be described. Routinely assessed biomarkers and diagnostic procedures applied for treatment sequence decisions will be collected.