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Cancer is a group of many related diseases. A simplistic definition of cancer is that some defect in our DNA, (specifically the chromosome responsible for normal controlled cell division, the P53 gene) is going astray. It is held that all cancers begin in cells, the body's basic unit of life. Cells make up tissues, and tissues make up the organs of the body.
I always thought that cancer is caused by plastic in some way, does anyone know if people had cancer before plastic was invented?