Serum homocysteine-based traffic light triage colonoscopy screening in colorectal cancer at-risk patients: A prospective cohort study

Table 1 Group stratification criteria

Group number	Criteria
Absence of lesion/no polyps	No pathological findings in the diagnostic colonoscopy
Low-risk lesion	Classified as low risk are those subjects who present the finding of polyps with low-risk endoscopic characteristics according to number (< 3), size (< 1 cm), endoscopic criteria of the Paris staging, and results of the pathological anatomy of the piece(s) obtained classified as adenoma
High-risk lesion	Polyps with high-risk endoscopic characteristics according to number (> 3), size (> 1 cm), endoscopic criteria of Paris staging, and pathological anatomy results of the piece(s) obtained compatible with a villous component, high-grade dysplasia, or intramucosal adenocarcinoma
Adenocarcinoma	Local and/or distant invasive adenocarcinoma