In the body, each type of cell multiplies at a
well-defined rhythm e.g.: some skin cells multiply every 8 hours, red blood
cells every 110 to 119 days, nerve cells never multiply ... every minute, 200
million of cells are born!
In some cases, cells multiply uncontrollably and
rapidly: they are then cancer cells. They become invasive, can form a tumor,
gradually destroy the tissues and organs where they have appeared and then
spread to form other tumors. The risk of cancer depends on heredity,
environment (pollution, virus ...), and behavior (exposure to the sun without
protection, tobacco, poor nutrition ...).
Several anti-cancer treatments (chemotherapy)
prevent the mitotic spindle retraction during mitosis.
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