Docetaxel and Epirubicin With and Without G-CSF in Treating Women With Metastatic Breast Cancer

DISEASE CHARACTERISTICS: Histologically or cytologically confirmed breast cancer Newly diagnosed or progressive metastatic disease with at least 1 metastatic target lesion No known clinical brain or leptomeningeal metastasis Phase I entry: Measurable and/or evaluable disease with an indicator lesion outside prior radiotherapy field Phase II entry: (closed as of 03/27/2000) Bidimensionally measurable disease with an indicator lesion outside prior radiotherapy field At least 1 x 1 cm on chest x-ray At least 2 x 2 cm on CT scan or ultrasound Skin lesion or node at least 1 x 1 cm No bone-only lesion Hormone receptor status: Not specified PATIENT CHARACTERISTICS: Age: 16 and over Sex: Female Menopausal status: Not specified Performance status: ECOG 0-2 Hematopoietic: Absolute granulocyte count at least 2,000/mm3 Platelet count at least 100,000/mm3 Hemoglobin at least 10 g/dL Hepatic: Bilirubin no greater than the upper limit of normal (ULN) AST/ALT no greater than 1.5 times ULN Alkaline phosphatase no greater than 2.5 times ULN (no greater than 5.0 times ULN if AST/ALT normal) Renal: Creatinine no greater than 1.5 times ULN Cardiovascular: Left ventricular ejection fraction at least 50% at rest by MUGA or echocardiogram No congestive heart failure No angina pectoris (even if controlled) No myocardial infarction within the past year No uncontrolled arrhythmia No uncontrolled hypertension Other: No active infection No grade 2 or greater symptomatic peripheral neuropathy No significant neurologic or psychiatric disorder, including dementia or seizures No peptic ulcer, unstable diabetes mellitus, or other contraindication to dexamethasone No prior malignancy except nonmelanomatous skin cancer or excised carcinoma in situ of the cervix Not pregnant or nursing Fertile patients must use effective contraception Geographically accessible PRIOR CONCURRENT THERAPY: Biologic therapy: No concurrent supportive colony-stimulating factors (e.g., filgrastim (G -CSF)) (Prophylactic treatment during the second step of phase I allowed) Chemotherapy: Phase I patients: At least 12 months since prior adjuvant chemotherapy Prior neoadjuvant chemotherapy allowed Prior cumulative dose of doxorubicin no greater than 300 mg/m2 Prior cumulative dose of epirubicin no greater than 500 mg/m2 If epirubicin dose level at least 90 mg/m2: Prior cumulative dose of doxorubicin no greater than 200 mg/m2 Prior cumulative dose of epirubicin no greater than 300 mg/m2 Phase II patients: (closed as of 03/27/2000) No prior neoadjuvant or adjuvant chemotherapy regimen other than cyclophosphamide, methotrexate, and fluorouracil, or doxorubicin and cyclophosphamide given for a maximum of 4 courses All patients: No prior chemotherapy for metastatic disease No prior taxanes Endocrine therapy: Prior hormonal therapy in the adjuvant and/or metastatic setting allowed if subsequent disease progression No more than 2 prior hormonal therapy regimens for metastatic disease No concurrent corticosteroids (except for premedication or hypersensitivity reaction) Radiotherapy: See Disease Characteristics At least 4 weeks since prior radiotherapy (unless single fractions for palliation) Concurrent local palliative radiotherapy for control of bone pain or for other reasons with no curative intent allowed Concurrent whole-brain radiotherapy for brain metastasis allowed No concurrent radiotherapy to sole measurable lesion Surgery: Not specified Other: No other concurrent investigational drugs or anticancer therapy No concurrent preventive IV antibiotics