Breast Cancer Trial of RPR109881 Versus Capecitabine in Male or Female Patients With Advanced Breast Cancer

Eligibility Criteria In order to be eligible for this trial you must: * Have a diagnosis of breast cancer that is now metastatic (meaning the cancer has spread beyond its original location) or a recurrence of the cancer in its original location that cannot be removed by surgery. * Have received previous treatment with anthracyclines (e.g., adriamycin, Doxorubicin) and taxanes (e.g., paclitaxel, docetaxel, Taxol®, Taxotere®) for your breast cancer and your doctor has determined that these treatment are no longer of benefit to you. * Be at least 18 years of age. * Not be taking other treatments for your cancer at the time you enter this trial. * Not be pregnant. Additionally, there are other criteria for study entry that a doctor participating in this study will need to review in detail with you and clinical assessments may need to be performed (e.g., lab tests, CT scans).