COHORT I (PATIENTS WITH NEWLY DIAGNOSED EARLY STAGE BREAST CANCER WHO WILL UNDERGO DEFINITIVE SURGERY BEFORE ANY SYSTEMIC THERAPY): Patients undergo baseline and, if applicable, follow-up core needle biopsies of breast cancer in the breast, regional nodes, and distant metastases. Patients who experience a recurrence or progression after therapy undergo additional core biopsies at the time of recurrence. Clinical and blood specimens will also be gathered.