Two Types of Breast Cancer – Signs and Symptoms to Look For  Breast cancer is classified into two types, based on whether or not it is invasive: * Noninvasive (in situ) breast cancer: Cancer cells have not spread to adjacent areas of your breast—they have remained in their place of origin. The most common type is ductal carcinoma in situ (DCIS), which occurs in the lining of the milk ducts. Noninvasive breast cancer is sometimes called “stage 0” cancer. * Invasive breast cancer. Cancer cells infiltrate or spread outside the membrane that lines a duct or lobule, into surrounding... (Read More ...)