E2112: Randomized Phase III Trial of Endocrine Therapy Plus Entinostat or Placebo in Hormone Receptor-Positive Advanced Breast Cancer. A Trial of the ECOG-ACRIN Cancer Research Group. - Connolly RM; Zhao F; Miller KD; Lee MJ; Piekarz RL; Smith KL; Brown-Glaberman UA; Winn JS; Faller BA; Onitilo AA; Burkard ME; Budd GT; et al. (Journal of clinical oncology : official journal of the American Society of Clinical Oncology, 2021)