Arsenous Acid for Refractory Triple-Negative Breast Cancer

The study is a Single-arm, two-stage, Phase II clinical trial. The main purposes of this study are to assess the efficacy and safety of arsenous acid in combination with palliative chemotherapy for refractory triple-negative breast cancer following multiple lines of treatment. Palliative chemotherapy regimen includes Eribulin, Gemcitabine, Utidelone and Vinorelbine, by the treatment of physician's choice (TPC). This study is designed based on Bayesian probability and divided into two stages. All patients will undergo tumor efficacy assessment every two cycles of treatment.