Breast cancer is the development of abnormal cells and clusters of such cells in the breast. These cells are different from normal healthy cells. Cells in the body normally divide only when new cells are needed. Sometimes, cells in a part of the body grow and divide out of control, which creates a mass of tissue called a tumor. If the cells that are growing out of control are normal cells, the tumor is called benign (not cancerous.) If however, the cells that are growing out of control are abnormal and don't function like the body's normal cells, the tumor is called malignant (cancerous). Cancers are named after

Some topics in this essay:
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