Use of Biomarkers to Guide Decisions on Adjuvant Systemic Therapy for Women With Early-Stage Invasive Breast Cancer: American Society of Clinical Oncology Clinical Practice Guideline Focused Update

This clinical practice guideline is a focused update of the American Society of Clinical Oncology’s 2016 guideline titled Use of Biomarkers to Guide Decisions on Adjuvant Systemic Therapy for Women with Early-stage Invasive Breast Cancer: American Society of Clinical Oncology Clinical Practice Guideline. The update discusses the use of MammaPrint to guide decisions on the use of adjuvant systemic therapy by examining both the publication of the phase III randomized MINDACT (Microarray in Node-Negative and 1 to 3 Positive Lymph Node Disease May Avoid Chemotherapy) study and other published literature on the MammaPrint assay for evidence of clinical utility. The guideline examines the contexts in which the MammaPrint assay will be beneficial for improving treatment decisions.