Inclusion Criteria:  Breast cancer was confirmed by surgery or biopsy. Pathologically diagnosis of estrogen receptor (ER), progesterone receptor (PR), human epidermal growth factor 2 (HER-2), Ki-67, and lymphatic vessel invasion (LVI) status in breast cancer. Routine MRI and DSI scans were performed within one week before the pathologic examination.  Exclusion Criteria:  Patients who had received treatment before DSI scanning. Patients who underwent breast tumor biopsy within two weeks before DSI image acquisition. Pathology results of breast masses were other diseases besides breast cancer. Post-processing of DSI data cannot be performed due to poor image quality, such as motion artifacts.