Dose Limiting Toxicity (DLT) Up to 1 cycle (21 days) in Phase 1b part [clinicaltrials_resource:634f7015628aca564f0c0f3070348c41]

Subjects with metastatic triple-negative breast cancer previously treated with 0 to 2 chemotherapy regimens in the metastatic setting

Dose Limiting Toxicity (DLT) Up to 1 cycle (21 days) in Phase 1b part [clinicaltrials_resource:634f7015628aca564f0c0f3070348c41]

Subjects with metastatic triple-negative breast cancer previously treated with 0 to 2 chemotherapy regimens in the metastatic setting