Endocrine Therapy for Hormone Receptor–Positive Metastatic Breast Cancer: American Society of Clinical Oncology Guideline

This a clinical practice guideline for women with hormone receptor (HR) -positive metastatic breast cancer (MBC). The guideline provides treatment recommendations for HR-positive MBC patients who are being considered for endocrine therapy. Recommendations are based on the answers to a number of different of questions including: Is there an optimal first-line endocrine therapy regimen for hormone receptor (HR) –positive metastatic breast cancer (MBC); is there an optimal second- or later-line endocrine therapy for HR-positive MBC; and how does adjuvant treatment affect recommendations for treatment in the metastatic or advanced setting.