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    Sunil Kumar
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    A gene mutation can instruct a healthy cell to:

    Allow rapid growth. A gene mutation can tell a cell to grow and divide more rapidly. This creates many new cells that all have that same mutation.
    Fail to stop uncontrolled cell growth. Normal cells know when to stop growing so that you have just the right number of each type of cell. Cancer cells lose the controls (tumor suppressor genes) that tell them when to stop growing. A mutation in a tumor suppressor gene allows cancer cells to continue growing and accumulating.
    Make mistakes when repairing DNA errors. DNA repair genes look for errors in a cell’s DNA and make corrections. A mutation in a DNA repair gene may mean that other errors aren’t corrected, leading cells to become cancerous.
    These mutations are the most common ones found in cancer. But many other gene mutations can contribute to causing cancer.

    https://www.mayoclinic.org/diseases-conditions/cancer/symptoms-causes/syc-20370588

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