Biomakers of breast cancer: Overview
Breast cancer management depends on biomarkers including estrogen receptor, progesterone receptor, and humanepidermal growth factor receptor 2 (ER/PR/HER2). Though existing scoring systems are widely used and wellvalidated, they can involve costly preparation and variable interpretation. Additionally, discordances betweenhistology and expected biomarker findings can prompt repeat testing to address biological, interpretative, or technicalreasons for unexpected results. The levels of these markers can influence how a person with breast cancer is treated inthe clinic.