There are two common kinds of breast cancer, ductal and lobular. Tumors can develop in one or both breasts. In ductal cancer, the malignant cells grow along the ducts or thin tubes connecting the lobes of the breast to the nipple. Invasive ductal cancer is the most common of all breast cancers. In lobular cancer, the cancer cells develop within the lobules of the milk-secreting glands at the end of the ducts.
Lobular cancer is more likely to appear in both breasts.
Why you should be concerned about Breast Cancer Breast cancer is the second leading cause of cancer death in women. The breast tumors are not lethal themselves, it's the spreading of the cancerous cells throughout the body's lymph system and bloodstream that kills. However, if caught early, most cases of breast cancer can usually be treated successfully. Perform a monthly breast self-exam so you will be able to recognize any changes in the way your breasts look and feel. Most breast lumps are discovered by the woman herself.