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Eng Course- All About Lung Cancer (Small Cell) - Download Free PDF


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The body is made up of trillions of living cells. Normal body cells grow, divide into new
cells, and die in an orderly fashion. During the early years of a person's life, normal cells
divide faster to allow the person to grow. After the person becomes an adult, most cells
divide only to replace worn-out or dying cells or to repair injuries.
Cancer begins when cells in a part of the body start to grow out of control. There are many
kinds of cancer, but they all start because of out-of-control growth of abnormal cells.
Cancer cell growth is different from normal cell growth. Instead of dying, cancer cells
continue to grow and form new, abnormal cells. Cancer cells can also invade (grow into)
other tissues, something that normal cells cannot do. Growing out of control and invading
other tissues are what makes a cell a cancer cell.
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