Overview Pre-operative Hormonal Treatment for Hormone Receptor Positive Breast Cancer Status: Suspended Trial end date: 2024-06-01 Target enrollment: Participant gender: Summary To investigate prospectively whether short term endocrine treatment can induce molecular changes, predictive for therapy response. Phase: Phase 2 Details Lead Sponsor: The Netherlands Cancer InstituteCollaborator: AstraZenecaTreatments: AnastrozoleEstradiolFulvestrantHormonesTamoxifen