1. Patients enrolled in the Phase I portion of the trial may have received prior docetaxel in the adjuvant or metastatic setting. Patients enrolled in the Phase II portion of the trial will not be considered eligible if they have received prior docetaxel as treatment for metastatic breast cancer. For the purposes of this protocol, patients who develop systemic metastasis < 6 months from adjuvant docetaxel will be considered to have had treatment with docetaxel for metastatic breast cancer and will be ineligible for protocol participation.