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Scientists actually believe that cancerous cells are constantly forming in our bodies. However, under normal circumstances, these cells either die on their own, usually through a process called apoptosis, or are cleared by our immune systems. These cancerous cells form as a result of epigenetic or genetic changes within the cell. If these changes result in the cells being resistant to apoptosis and our immune systems, tumors begin to form.

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12y ago
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14y ago

occurs when mutation in DNA.

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