It is genetic accide: It is not possible to answer your question exactly they way you may like to see as we cannot pinpoint in any one individual, what caused his/ her Cancer. But on a population basis the causes are multiple, including smoking, excess use of alcohol, Aging, immune deficiency, virus infections and Chemical exposure to DNA damaging agents like Radiation from multiple sources. Overeating and Obesity also
Answered 10/29/2020
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