MedicineOncologySurgeryBreast OncologyChemotherapyMedical OncologyBreast Cancer PharmacotherapyBreast Cancer RadiotherapyBreast Cancer SurgeryBreast SurgeryCytotoxic ChemotherapySystemic Therapy For Breast CancerBreast Cancer ChemotherapyContinuous Course Of TreatmentCyclophosphamide DosingCyclophosphamide-based TherapyRandomized Clinical Trials