A cure of sorts HAS already been found. But it is not widely known.
Because then the conglomerates making money from people who have cancer would stop making money.
The cure? A change of lifestyle. A change of food habits. Even when you have cancer, it can be cured if it stops being "fed".
Of course this will not always be the case, but most times, it is.
Also, cancer can be caused by undealt-with feelings of anger and bitterness so you have to take those elements into account too.