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The body is made up of many types of cells Normally cells grow and divide to produce more cells only when the body needs them This is an orderly process which keeps the body healthy Sometimes cells keep dividing when new cells are not needed They may form a mass of extra tissue called a growth or tumor Benign tumors are not a threat to life but malignant tumors are cancer Cells in these tumors can invade and damage nearby tissues and organs The fear is that cancer cells can break away from a malignant tumor and enter the bloodstream or lymphatic system That is how breast cancer spreads and forms other tumors in the body The spread of cancer is called metastisis Dollinger Rosenbaum and Cable 1991 Each breast has 15 to 20 overlapping sections called lobes There are many smaller lobules which end in dozens of tiny bulbs that can produce milk The lobes lobules and bulbs are all linked by thin tubes called ducts These ducts lead to the nipple in the center of a dark area of skin called the areola Fat fills the spaces around the lobules and ducts The breast does not have muscles tissue but muscles lie under each breast and cover the ribs Each breast contains blood vessels and vessels that contain lymph The lymph vessels lead to small bean shaped organs called lymph nodes Clusters of lymph nodes are found near the breast under the arm above the collarbone and in the chest They are also found in other parts of the body Dollinger Rosenbaum and Cable 1991 According to Dollinger Rosenbaum and Cable 1991 the most common type of breast cancer begins in the lining of the ducts It is called ductal carcinoma Lobular carcinoma arises in the lobules They explain that when breast cancer spreads outside of the breast cancer cells are often
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