NCT02955394 was an open-label randomized phase II trial of fulvestrant with or without enzalutamide for ER+/HER2- breast cancer, conducted at the Universities of Colorado, Tennessee, and Memorial Sloan Kettering Cancer Center. The study involved 61 patients, assessing safety, antitumor effects, and tissue acquisition through biopsies and plasma samples. Key assessments included PEPI score, RPPA, metabolomics, and gene expression analysis to evaluate treatment efficacy and safety.