Normal cells and cancer cells are different in several ways. Normal cells reproduce themselves exactly and stop reproducing when they are supposed to. They self-destruct when they have completed their job or if they become damaged. Cancer cells keep on reproducing and do not obey signals to stop.
A human colon cancer cell undergoes mitosis (division). Unlike normal cells, cancer cells do not die, but continue to divide.
They have been called immortal because they refuse to die on their own. Normal cells stick together. Cancer cells do not, which allows them to become detached from their neighboring cells. Finally, normal cells mature and become specialized in doing their job. Cancer cells remain immature and even become more immature or primitive over time; they do not perform any helpful function in the body.
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