RATIONALE: Identifying genes that increase a person's susceptibility to side effects caused by capecitabine may help doctors plan better treatment. PURPOSE: This clinical trial is studying blood samples in predicting response to capecitabine in women with metastatic breast cancer.
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Capecitabine-related toxicity (i.e., hematological, diarrhea, and hand-foot syndrome) recorded during the first and second courses
Timeframe: 3 months