[Gatsky]

Ah, we are getting ahead of ourselves. This isn't a preventative measure. It is a diagnostic device. The distinction is important because what will become increasingly apparent is we don't have good tools to deal with cancer when it is detected very early. One of the major problems is working out which of these 'detection events' is going to progress into clinically meaningful disease. We can't just take out (or even biopsy) the prostate of everyone with a hit.

[mschuster91]

At early stages you can simply blast it with chemo/radiation before it manifests into something intreatable though.

[neuronic]

If you are certain that it is malignant cancer and not one of the other billion tumor forms that may not even spread.

Otherwise, you are exposing people to side effects of radiation and chemotherapy without them needing it.

This is called overtreatment and sought to be avoided for a reason.