A cure for cancer does exist.
No, it isn't found in a pill, and I don't know where the "too late" point is in one's cancer (as in "too late to cure").
There are studies showing the prevention of cancer, and the complete reversal of some cancers. These are professional, scientific, peer-reviewed studies funded (for over 27 years) in part, by the American Cancer Society and The American Institute for Cancer Research, that were done by medical and research scientists. The results were published in many of the top scientific journals.