Eligible Chinese patients must be female with good performance status (ECOG PS: 0 or 1), have had histopathological diagnosis with HR+/HER2- advanced/metastatic breast cancer...A secondary objective is to evaluate the preliminary activity of AN1004 and PTX combination therapy....intravenous administration of AN1004 plus PTX is safe and well-tolerated in Chinese patients with advanced/metastatic breast cancer, and demonstrates anti-tumor activity.