Breast cancer starts when cells in the breast initiate to grow out of control. These cells typically form a tumor that can often be felt as a lump. If the cells can grow into surrounding tissues or spread to distant areas of the body, the tumor is malignant. The breast cancer which initiate in the ducts that carry milk to the nipple is called ductal cancers. Some breast cancers begin in the glands that make breast milk is called lobular cancers. A small number of cancers start in other tissues in the breast. These cancers are called sarcomas and lymphomas. Benign breast tumors are uncharacteristic growths, but they do not extent outside of the breast and they are not aggressive. But some benign breast lumps can upsurge a woman's risk of getting breast cancer.