MONITOR-Breast: Monitoring cell-free tumor DNA as a marker of recurrence in Breast Cancer MONITOR-Breast: Monitoring cell-free tumor DNA as a marker of recurrence in Breast Cancer This is a prospective, observational study designed to evaluate the clinical validity of Myriad Genetics’ MRD test in patients diagnosed with breast cancer. It is expected that enrollment will be split between the different breast cancer subtypes defined by immunohistochemistry (HR+/HER2-, HER2+ (HR+ and HR-), TNBC) and according to BINV-A of National Comprehensive Cancer Network guidelines with ER+ status used here as >10% of nuclei staining.ClinicalTrials.gov registration not requiredMarcela Mazo Canola MD