The types of tumors that do spread throughout the body and invade the tissues around the breast are considered to be cancer and have been given the name “malignant tumors”.  It is said that any type of tissue in the breast can form some type of cancer, but it mostly comes from either ducts or glands. It can take months or even years for a tumor to get big enough for someone to actually feel it in their breast, so they are encouraged to be screened for tumors by a mammogram.  Mammograms are designed to detect any type of disease [...]