Overview Fertility Preservation in Breast Cancer Patients Status: Active, not recruiting Trial end date: 2022-12-01 Target enrollment: Participant gender: Summary The purpose of this study is to evaluate efficiency and safety of controlled ovarian stimulation (COS) associated with an aromatase inhibitor (letrozole) for fertility preservation in breast cancer patients. Phase: Phase 4 Details Lead Sponsor: Erasme University HospitalTreatments: Letrozole