Overview AGE Levels in ER+ Metastatic Breast Cancer Patients Receiving Endocrine Therapy Status: Active, not recruiting Trial end date: 2021-12-30 Target enrollment: Participant gender: Summary The purpose of this study is to look at the effects that the study drug (OPC) has on AGE levels in patients with ER+ metastatic breast cancer. Phase: Phase 1 Details Lead Sponsor: Medical University of South CarolinaTreatments: Metformin