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Cancer occurs when the rate of cell multiplication is faster than the rate of cell death. This causes the growth of a tumour (a mass of
abnormally growing and uncontrollable cells); often in tissues with a high rate of mitosis e.g. the lungs.

Cancers are caused by damaged DNA.

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o Physical
UV light physically damages DNA in skin cells, sometimes a mole which has been affected by UV light may start to grow bigger, and
develop into a tumour.
Cancer cells sometimes spread to other parts of the body, carried in the blood and lymphatic systems.


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