There is a lot of research done to look for early warnings. The current status of this research is that a DNA-based test gives marginal improvements over the s

There is a lot of research done to look for early warnings. The current status of this research is that a DNA-based test gives marginal improvements over the standard test, which screens for blood. See for example: https://www.cancer.gov/types/colorectal/screening-fact-sheet https://www.cancer.gov/types/colorectal/screening-fact-sheet