Docetaxel With or Without a Phytochemical in Treating Patients With Breast Cancer

RATIONALE: Drugs used in chemotherapy, such as docetaxel, work in different ways to stop the growth of tumor cells, either by killing the cells or by stopping them from dividing. Dietary supplements, such as phytochemicals, may stop or delay the development of breast cancer. It is not yet known whether giving docetaxel together with a phytochemical is more effective than giving docetaxel alone in treating patients with breast cancer. PURPOSE: This randomized phase II trial is studying how well giving docetaxel together with a phytochemical works compared with giving docetaxel alone as first- or second-line therapy in treating patients with breast cancer.