Don't do this. Nearly all cancer tests are overly sensitive, and not great at detecting the cancers you care about (the ones that will progress).

If you run out and get a bunch of random cancer tests, you are basically ensuring that you will get unnecessary and painful treatment for a finding that probably wouldn't have harmed you in the first place.

It's not a satisfying answer, but it's true. The reason most cancers are found late is because there's no effective alternative.