T1 colorectal cancer management in the era of minimally invasive endoscopic resection

Table 4 T1 Colorectal cancer surveillance

Guideline	First surveillance		Subsequent surveillance
Japanese Society for Cancer of the Colon and Rectum 2019[10]	Colonoscopy at 6-12 months		No specific comment
European Society of Gastrointestinal Endoscopy 2019[11]	Colonoscopy at 3-6 months		1, 3, and 5 yr
American Gastroenterology Association 2021[60]	Colon	Colonoscopy at 3-6 months	6 months and 1 yr
	Rectum	Flexible sigmoidoscopy at 3-6 months and colonoscopy at 1 yr	Flexible sigmoidoscopy every 6 months up to 5 yr, with concomitant EUS or pelvic magnetic resonance imaging every 3-6 months for 2 yr, then every 6 months to complete 5 yr. May consider CT chest, abdomen, and pelvis for 3-5 yr

EUS: Endoscopic ultrasound; CT: Computed tomography.