RecruitingClinical trialCorrelation of Molecular Markers With Response to Therapy and Breast Cancer BehaviorRATIONALE: Studying samples of tumor tissue and blood from patients with cancer in the laboratory may help doctors learn more about changes that occur in DNA and identify biomarkers related to cancer. It may also help doctors predict how patients will respond to treatment. PURPOSE: This research study is looking at tissue and blood samples from women with locally advanced or metastatic breast cancer