Nab-paclitaxel Dose Schedual for HER-2 Negative Advanced Breast Cancer

What is the best dosage of Nab-Paclitaxel for chinese? This study would divide patients into two dosage groups: 1) 125mg/m2, 30 minutes intravenous injection, d1, 8, 21 days for a cycle(clinical use); 2) 125mg/m2 d1, 8, 15, 30 minutes intravenous injection, 28 days for a cycle(guideline recommand). Treatment to disease progression. The efficacy (CR, PR, SD, PD) is evaluated every 2-4 cycles.If the patient withdraws from the trial because he cannot tolerate the toxicity caused by one of the drugs, such as neurotoxicity or bone marrow toxicity, it is recommended to switch to other drugs and follow up to PFS and OS.Each group was planned to include 30 patients.