Cancer is believed to be caused by genes damaged by corrosion. These damaged segments of DNA are called adducts. When adducts multiply and become numerous in one cell, they can cause enough of a change in function to make the cell immortal. The immune system cannot recognize them and they will rapidly make more cells just like themselves through cell division or mitosis. When the cells divide, they make the copies will all the same errors the adducts have. With every new division all the cells are the same cell with the same damage DNA segment as the first. This could be when the cancer cells are produced.
Having said that, all cells in the body need to be replaced with the exception of the nerve cells in the central nervous system. A cell will lose the ability to reproduce itself exactly as its neighbor should enough genetic damage take place the resulting cells will ignore the numerous controlling signals of the body. This is the beginning of the cancerous cell. Once a cancer becomes malignant it basically takes over the body of the host. When the body of the host is devoured, the host will die and the cancer will die with it.
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