For a patient whose cancer has progressed, do you obtain a new biopsy or go back to the original sample? Why?
What biomarkers do you test for in advanced-stage breast cancer and when? Is there a need for NGS testing before first-line metastatic disease? (eg, BRCA, PIK3CA, PD-L1, NTRK, MSI-H/dMMR, TMB-H)