Of course this whole story is a typical media beat-up. We know that cancer can be eradicated - it happens every day. Even in the absence of medical treatment seeming terminal cancers can go into complete remission and never return (as a bit of an aside if anyone has any desire to become a saint the easiest way to achieve this is to go around blessing cancer patients. As long as you bless enough you will get the required two “miracles” you need from spontaneous remissions alone).
Since cancer is the consequence of the loss of the regulation of cell division it is axiomatic that in any cellular system given enough time and mutations the regulation will be lost in at least one cell of an individual. We don’t need to prevent disruption of the regulatory system, although this is good, we just need to be better able to identify and destroy those cells that are not regulated.