Really.
Presumably bad luck random mutations occur very often—and the question is why those that take over do so.
. The way to cure cancer is to get a persons immune sysem to recognize it and destroy those cells.
When a persons immune system doesn't recognize the threat , cancer cells will spread.
So-called Miracle Cures happen when a person is cancer ridden and given up for lost; but hangs on, and after years go by is diagnosed s cancer free.
Their immune system for whatever reason decided to attack the cancer cells, resulting in a reversal of the otherwise fatal problem. -Tom