We are able to early detect these cancers right now with routine targeted imaging. Perhaps we should be working to solve or improve on the drawbacks associated with doing this, some of which are:

CT scans emit ionizing radiation.

MRI contrast can buildup and be retained in the body over repeated administrations.

The scans can produce false positives, surface benign abnormalities which result in a wild goose chase, cause severe patient anxiety and healthcare burden, and result in over-treatment.

And of course doing this on a whole population level is not cost or time effective.