The study had two phases, a safety dose finding lead-in and second part efficacy study in the population of breast cancer patients with residual disease after neoadjuvant chemotherapy. The dose finding lead-in was required by regulatory authorities due to the absence of published safety data on the combination of capecitabine and entinostat. Details regarding the modeling approach and design considerations for both phases of the study have been provided in a prior report [19 (link)]. Due to drug supply limitations, the study closed after the first phase. For the first phase safety lead-in, metastatic breast cancer patients were enrolled. The patient population included female patients age 18 years and older, ECOG performance status of 0-2, with histologically confirmed diagnosis of metastatic, ER/PR-positive or negative, and HER2-negative breast cancer.
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