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Proposed biomarkers that need to be tested in MBC patients. Abbreviations: MBC, metastatic breast cancer; ER, oestrogen receptor; PgR, progesterone receptor; HER2, human epidermal growth factor receptor 2; MSI, microsatellite instability; TMB, tumor mutation burden; IHC, immunohistochemistry; TNBC, triple‐negative breast cancer; PD‐L1, programmed death‐ligand 1.
