Cells in the human body are dividing, proliferating, and aging all the time, and DNA is constantly replicating. New cells will replace dead cells, thereby forming a dynamic balance that can maintain the health of the body.
During the process of cell division, DNA will be copied incorrectly, causing genetic mutations, and some cells will mutate into pre-cancer cells.
The human body contains a large number of cells, so everyone has cancerous cells in their body, but not everyone will get cancer because the body can repair mutated cells.
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