Angela's comment deals with staging unknowns before surgery and metastatic disease risks. There are several professional tensions between surgeons and oncologists about initial colon cancer treatment. We favor the surgeons even with some met load, but with more advanced chemistry in place.
The way we dealt with metastatic disease risk was to do several things, like much of the Life Extension presurgical
cancer protocols including things like cimetidine, heavy vitamin D3 and other nonstandard chemistry
. And it worked much better than "standard" presurgical preparation (very little chemistry there) could have, because there had been a lot of metastatic disease.
One problem implied here may be one of medical marketing control - like saving the CT for just before surgery, cutting out your opportunity for multiple outside opinions, and other providers. However, too much negative medical information, too soon might cancel an otherwise successful surgery, at least if sufficient advanced (nonstandard) nutrition and chemistry were in place. The primary reason we escaped this latter cancellation situation, was because of an impending obstruction.
The "extra" blood tests that overpriced, cattle class medicine won't run upfront at diagnosis, ones that repeatedly cause grief years later, include LDH, CA19-9, ESR, hsCRP, quantitative D-dimer, and 25-hydroxy vitamin D3. AFP, CA-125 and others have been helpful for some here. All these tests are commonly available labs.