The
term “breast cancer” refers to a malignant tumor that has developed from cells
in the breast. Usually breast cancer either begins in the cells of the lobules,
Which are the milk producing glands, or the ducts, the passages that drain milk
from the lobules to the nipple. Less commonly, breast cancer can begin in the stromal
tissues, which include the fatty and fibrous connective tissues of the breast.
Over
time, cancer cells can invade nearby healthy breast tissue and make their way
into the underarm lymph nodes, small organs that filter out foreign substances
in the body. If cancer cells get into the lymph nodes, they then have a pathway
into other parts of the body . The breast cancer’s stage refers to how far the
cancer cells have spread beyond the original tumor.
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