Overview Neoadjuvant Letrozole and Palbociclib in Patients With Stage II-IIIB Breast Cancer, HR+, HER2 - Status: Completed Trial end date: 2019-12-31 Target enrollment: Participant gender: Summary This is an international, multicenter, open-label, non-comparative, Simon“s two-stage design, phase II clinical trial. Phase: Phase 2 Details Lead Sponsor: MedSIRCollaborator: PfizerTreatments: LetrozolePalbociclib