Having cancer is probably the single greatest risk factor for getting cancer again later.
The first scenario is obvious – a couple cells escaped the first time and have since repopulated and formed another tumor.
The second scenario is astronomically bad luck – you have a genetic mutation that pre-disposes you to cancer and every cell in your body is susceptible. People with certain juvenile cancers are very likely to have a recurrence a few years later.
The third scenario involves the treatment itself – a lot of cancer treatments are really bad for you. They’re nasty poisons or radiation treatments that are specifically targeting human cells. It’s unpleasant, but better than dying.
You survive, but a lot of your cells have been damaged in the process and are themselves now more likely to become cancerous in the future.
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