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RATIONALE: Drugs used in chemotherapy, such as cyclophosphamide and capecitabine, work in
different ways to stop the growth of tumor cells, either by killing the cells or by stopping
them from dividing. Giving more than one chemotherapy drug may kill more tumor cells.
PURPOSE: This phase II trial is studying how well giving cyclophosphamide together with
capecitabine works in treating women with stage IV breast cancer.
Ages:18 and older
DISEASE CHARACTERISTICS: - Histologically or cytologically confirmed stage IV breast cancer - Metastatic disease (M1) OR multiple sites of new disease that is clinically obvious metastatic disease (i.e., multiple sites of new osseous disease) - Meets 1 of the following criteria: - Measurable disease - Non-measurable disease - MUC-1 antigen level > 2 times upper limit of normal AND level has increased by 1.5 times - Must have documented MUC-1 antigen level - Either cancer antigen (CA) 15-3 or CA 27-29 allowed - Must have received at least 1 prior hormonal therapy for metastatic disease (estogen receptor-positive patients only) - No symptomatic brain or CNS metastases - Previously treated brain or CNS metastasis allowed provided radiotherapy was completed ≥ 8 weeks before study entry - Hormone receptor status: - Not specified PATIENT CHARACTERISTICS: Age - 18 and over Sex - Female Menopausal status - Not specified Performance status - Zubrod 0-2 Life expectancy - Not specified Hematopoietic - No known existing uncontrolled coagulopathy Hepatic - Not specified Renal - Creatinine clearance > 40 mL/min Cardiovascular - No congestive heart failure - No symptomatic coronary artery disease - No cardiac arrhythmia not well controlled with medication - No myocardial infarction within the past 12 months - No other clinically significant cardiac disease Gastrointestinal - Able to take oral medication - No uncontrolled nausea, vomiting, or diarrhea - No lack of physical integrity of the upper gastrointestinal tract - No malabsorption syndrome Other - Not pregnant or nursing - Fertile patients must use effective contraception - No active infection requiring systemic therapy - No prior severe reaction to fluoropyrimidines - No known sensitivity to fluorouracil - No known dihydropyrimidine dehydrogenase deficiency - No other malignancy within the past 5 years except adequately treated basal cell or squamous cell skin cancer or carcinoma in situ of the cervix PRIOR CONCURRENT THERAPY: Biologic therapy - No concurrent immunotherapy or biologic therapy for breast cancer - No concurrent gene therapy for breast cancer - No concurrent filgrastim (G-CSF) Chemotherapy - At least 14 days since prior chemotherapy and recovered - No more than 2 prior chemotherapy regimens for metastatic disease - No prior capecitabine for metastatic disease - No prior oral cyclophosphamide for metastatic disease - Prior IV cyclophosphamide allowed - No other concurrent chemotherapy for breast cancer Endocrine therapy - See Disease Characteristics - No concurrent hormonal therapy for breast cancer Radiotherapy - See Disease Characteristics - At least 14 days since prior radiotherapy to non-CNS disease sites and recovered - No concurrent radiotherapy for breast cancer Surgery - Not specified Other - Concurrent bisphosphonates allowed - No concurrent full-dose warfarin - Concurrent prophylactic warfarin (≤ 1 mg/day) to maintain port patency allowed - No other concurrent antineoplastic therapy for breast cancer
Sponsor: Southwest Oncology Group
Phase: Phase 2
Trial ID: NCT00107276
Not Accepting Healthy Volunteers