الفهرس 
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Abstract
Cancer is a dangerous disease occupying the second fatality causation of death after heart diseases. The problem had been exaggerated geavely in the passing decades ringing the bell of danger of more expected future incidence especially in the immature and developing countries. Cancer cells were once normal ones but due to being exposed to some factors called mutagens, they had been transformed into cancerous cells. Some of those mutagens like X-rays, Gamma rays, Ultra-violet rays and radioactive decays of unstable element like Uramium-238. Others are internally like smoking, alcohol consumption, obesity, diet, physical inactivity, and hormonal factors.
The difference between cancer cells and normal cells had been revealed obvious from the newly acquired features in cancer cells like hyper