NCT01381874 2019-04-11A Study of Abiraterone Acetate Plus Prednisone With or Without Exemestane in Postmenopausal Women With Estrogen Receptor-Positive (ER+) Metastatic Breast Cancer Progressing After Letrozole or Anastrozole TherapyJanssen Research & Development, LLCPhase 2 Completed297 enrolled 19 charts