Overview The Use of Metformin in Early Breast Cancer Patients Pre-Surgery Status: Withdrawn Trial end date: 2016-02-01 Target enrollment: Participant gender: Summary The study will test metformin in patients with early breast cancer. Blood and tissue will be collected before and after the use of metformin. Phase: Early Phase 1 Details Lead Sponsor: Instituto Nacional de Cancer, BrazilTreatments: Metformin