Cancer just does not happen in one day. it is a journey of normal cell to cancer cell and this may take many years. The genetic changes that occurs is in multiple genes both proto-oncogene and tumor suppressor gene and the accumulation of these changes lead to cancer. This is multistep model of cancer development
This period can be used to either cut down on the carcinogenic products by change in lifestyle and also for regular checkups that is screening to detect cancer at early stages and even at pre-malignant stages
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