[Slide 2] - Normal cells. Non-invasive [Slide 3] - cancers that stay within the milk ducts or lobules in the breast, where they started. They do not grow into or invade normal tissues within or beyond the breast. Non-invasive cancers are sometimes called carcinoma in situ (“in the same place”) or pre-cancers. Invasive [slide 4] - cancers that do grow into normal, healthy tissues, turning them cancerous. Most breast cancers are invasive. Ductal - affecting cells in the passages between the milk producing centers and the nipples. Lobular - affecting cells in the milk-producing centers of the breast. In Situ - Non-invasive.