RecruitingClinical trialCore Biopsies for Establishing a Breast Tumor Tissue RepositoryThis research trial establishes a breast tumor tissue repository from core biopsies. Collecting breast tissue from core biopsies may allow doctors to learn more about the biology of breast cancer and to analyze proteins, genes, and other components of tumor cells. It may also allow doctors to conduct future studies to help understand how breast cancer grows and how it responds to different types of therapy. This will help doctors develop better breast cancer therapies and better tests to help make treatment decisions.