The purpose of this study is to determine whether UTD1 Injection in combination with capecitabine is effective in the treatment of advanced metastatic breast cancer using capecitabine as a control.

Inclusion Criteria:

1. Histologically and/or cytologically diagnosed patients with advanced, metastatic breast cancer,or lacking standard therapy or being failed to or recurrent after standard therapy;
2. Patients who have previously treated with ≤4 chemotherapeutic regimes;
3. Patients who have previously treated with an anthracyclin antibiotics and a taxane;
4. Age 18 -70 years old, ECOG performance status of 0-2; Life expectancy of 3 months or more;
5. Patients with at least 1 measurable target lesion determined by CT within 2 weeks prior to enrollment;
6. Neuropathy \