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Surveillance after colorectal polyp removal.

Surveillance colonoscopy is aimed to reduce CRC incidence and mortality by removing adenomas and detecting CRC in early stage. However, colonoscopy is an invasive and expensive procedure and surveillance colonoscopy should be targeted at those who are most likely to benefit at the minimum frequency required to protect for cancer. Surveillance recommendations are based on guidelines, but the recommendations in those guidelines are based on moderate to low quality evidence and adherence to these guidelines is poor. As surveillance colonoscopy is one of the main indications for colonoscopy and surveillance colonoscopies are filling colonoscopy lists, the current surveillance practice results in spending lots of money and capacity in a suboptimal way. Randomized controlled trials to compare surveillance intervals are not available. However, current evidence based on several case-control and cohort studies suggests there is no need for surveillance in patients with low-risk adenomas, i.e. 1-2 adenomas smaller than 10 mm. Patients with 3 or more adenomas or any adenoma larger than 10 mm seem to be the ones at real risk for metachronous adenomas or cancer. In those patients, surveillance colonoscopy is indicated at 3 years after baseline until ongoing studies will confirm the safety of enlarging this interval. Randomized controlled trials and experimental research are important in order to provide the necessary scientific evidence for the optimization of follow-up strategies for patients with adenomas and serrated polyps.

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