CNS Disease

This study is designed to establish the safety of the combination of PD-1 inhibitor tislelizumab, an anti-angiogenic agent bevacizumab and a chemotherapeutic agent capecitabine, in a phase Ib setting and to evaluate preliminary efficacy in selected expansion cohorts, including PD-L1-negative metastatic triple negative breast cancer (TNBC) and patients with active CNS disease. A sequential approach to cohort expansion will allow further evaluation in hormone receptor positive (HR+), HER2 negative (HER2-) disease if a signal of activity is observed in PD-L1 negative TNBC.