Randomized Clinical Trial to Evaluate the Predictive Accuracy of a Gene Expression for Stage I-II Breast Cancer

Primary Objectives: 1. To prospectively evaluate the predictive accuracy of a previously discovered gene expression profile-based test to foretell pathologic complete response (pCR) to preoperative paclitaxel/FAC (5-fluorouracil, doxorubicin, cyclophosphamide) chemotherapy for stage I-III breast cancer. 2. To evaluate if our genomic predictive test is specific to the paclitaxel/FAC regimen or it also predicts increased sensitivity to FAC only chemotherapy. Secondary Objectives: 1. To discover a molecular profile that is associated with pCR after FAC chemotherapy alone 2. To establish a prospectively collected gene expression profile data bank of breast cancer for future studies 3. To compare the pCR rates between patients who receive 6 courses FAC and those who receive sequential paclitaxel /FAC chemotherapies.