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Kaplan‐Meier PFS and OS curves of patients with advanced breast cancer stratified by liver metastasis and CM administration. A&B, PFS and OS curves of all patients; C&D, PFS and OS curves of patients with or without liver metastasis; E&F PFS and OS curves of patients receiving the CM regimen as maintenance therapy or as salvage therapy. Abbreviations: PFS, progression‐free survival; OS, overall survival; CM, cyclophosphamide and metrotrexate
