Endoscopic surveillance after surgical or endoscopic resection for colorectal cancer: European Society of Gastrointestinal Endoscopy (ESGE) and European Society of Digestive Oncology (ESDO) Guideline.

1:  We recommend post-surgery endoscopic surveillance for CRC patients after intent-to-cure surgery and appropriate oncological treatment for both local and distant disease.Strong recommendation, low quality evidence. 2:  We recommend a high quality perioperative colonoscopy before surgery for CRC or within 6 months following surgery.Strong recommendation, low quality evidence. 3:  We recommend performing surveillance colonoscopy 1 year after CRC surgery.Strong recommendation, moderate quality evidence. 4:  We do not recommend an intensive endoscopic surveillance strategy, e. g. annual colonoscopy, because of a lack of proven benefit.Strong recommendation, moderate quality evidence. 5:  After the first surveillance colonoscopy following CRC surgery, we suggest the second colonoscopy should be performed 3 years later, and the third 5 years after the second. If additional high risk neoplastic lesions are detected, subsequent surveillance examinations at shorter intervals may be considered.Weak recommendation, low quality evidence. 6:  After the initial surveillance colonoscopy, we suggest halting post-surgery endoscopic surveillance at the age of 80 years, or earlier if life-expectancy is thought to be limited by comorbidities.Weak recommendation, low quality evidence. 7:  In patients with a low risk pT1 CRC treated by endoscopy with an R0 resection, we suggest the same endoscopic surveillance schedule as for any CRC.Weak recommendation, low quality evidence.