Estradiol Not Yet Recruiting Phase 2 Trials for Prognostic Stage IV Breast Cancer AJCC v8 / Progesterone Receptor Negative / Prognostic Stage IIIB Breast Cancer AJCC v8 / Prognostic Stage IIIC Breast Cancer AJCC v8 / Prognostic Stage III Breast Cancer AJCC v8 / Recurrent Breast Carcinoma / Anatomic Stage IIIB Breast Cancer AJCC v8 / Anatomic Stage IIIA Breast Cancer AJCC v8 / Estrogen Receptor Negative / ESR2 Positive / Anatomic Stage IV Breast Cancer AJCC v8 / Metastatic Triple-Negative Breast Carcinoma / Prognostic Stage IIIA Breast Cancer AJCC v8 / Anatomic Stage III Breast Cancer AJCC v8 / Anatomic Stage IIIC Breast Cancer AJCC v8 / HER2/Neu Negative Treatment