Anonymous
Anonymous asked in HealthDiseases & ConditionsCancer · 8 years ago

How does cancer begin in a human body? What causes it?

Why are cancer cells immortal?

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  • 8 years ago
    Best Answer

    Look up HeLa cells http://en.wikipedia.org/wiki/HeLa

    These cells are immortal. Not all cancer cells are immortal.

    Cancers begin when there is damage to the genetic material

    in a cell that makes the cell lose the "brakes" that normally

    inhibit cellular replication after a certain number of cells

    have been made be cell division/mitosis.

    The injury may be caused by a chemical - numerous carcinogenic

    chemicals are present in tobacco smoke, or radiation exposure.

    Even sunlight is carcinogenic. The initial tumor cells have to evade

    the immune system to get a "foothold."

    Source(s): MD Medical Oncologist and Hematologist - a cancer and blood specialist doctor - with twenty years experience
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