We all get cancer many times in our lives, but our immune system normally eliminates it without our awareness of the close call.
The problem with most cancers is that they are not cause by something present, a mutagenic virus, for example. Instead they result from something absent, a healthy, raring-to-go immune system.
Therefore the focus should be on boosting the immune system.
If the NSA were on the ball, it would release mountains of spurious, preposterous information to muddy the waters and discredit what's-his-spying-ass-name.
Plus any scraps of gossip (real or not) might discourage the misguided critter.