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.
This Guideline is an official statement of the European Society of Gastrointestinal Endoscopy (ESGE) and Digestive Oncology (ESDO) on the surveillance of colorectal cancer after endoscopic or surgical resection. The Grading of Recommendations Assessment, Development, and Evaluation (GRADE) system was adopted to define the strength of recommendations and the quality of evidence.
Endoscopic surveillance after surgery for colorectal cancer (CRC) requires a multidisciplinary approach among several specialties, including endoscopy, oncology, and surgery. Its relevance is expected to increase in the near future, being directly related to the high prevalence of CRC, which now ranks as the third most prevalent cancer in Western countries  .
The role of surveillance endoscopy in this setting relates to the detection of metachronous and recurrent CRC, and its efficacy in thereby improving outcomes for CRC. This is in contrast to the setting of post-polypectomy colonoscopy surveillance, where clinically relevant precancerous lesions, rather than already developed CRCs, are the main target of the intervention. Surveillance colonoscopy represents the primary modality for the prevention and early detection of metachronous CRC and is usually integrated with other biochemical and radiological tests for the detection of local and distal malignant recurrences  . However, endoscopy capacity is limited, so the appropriate use of endoscopy resources in surveillance post-CRC surgery is desirable.
Endoscopic surveillance is also performed following complete endoscopic resection of early (invasive) CRCs, previously known as “malignant polyps.” The rate of early CRC amenable to endoscopic resection – i. e. with low risk of lymph node or distant metastasis – increased dramatically with the implementation of organized programs  . Approximately 10 % of CRCs diagnosed in fecal immunochemical test (FIT)-based programs are removed endoscopically, accounting for nearly a half of all CRCs detected at an early stage   .
The aim of this joint guideline by the European Society of Gastrointestinal Endoscopy (ESGE) and the European Society of Digestive Oncology (ESDO) is to provide guidance on the use of colonoscopy surveillance after surgery for CRC, as well as after complete endoscopic resection of an early CRC.
This guideline was commissioned by the ESGE and the ESDO. Each society nominated four or five experts for a multidisciplinary task force. In 2017, subgroups were formed, each of which was in charge of a series of clearly defined key questions that were formulated using the PICO (population, intervention, comparator, outcome) methodology  , as detailed in Appendix 1s (see online-only Supplementary Material).
The guideline committee chairs (C.H., J.R., L.F., T.S., and M.P.) worked with the subgroup leaders to identify pertinent systematic search terms that included “colon,” “rectum,” “general surgery/surgery,” “resection,” “colectomy,” “colonoscopy,” “endoscopy,” “surveillance,” and “follow up.” Searches were performed (at least) on Medline (via PubMed) and the Cochrane Central Register of Controlled Trials up to October 2017. Evidence tables were generated for each key question, summarizing the level of evidence from the available studies. For important outcomes, articles were individually assessed using the GRADE system to grade the evidence levels and recommendation strengths  ( Appendix 2s ). According to the GRADE system, a hierarchy across the main outcomes according to clinical relevance was set before the risk/benefit ratio was assessed, as detailed in Appendix 3s .
It was decided that the issues of computed tomography colonography (CTC) in patients with obstructing CRC and “quality of colonoscopy” would be excluded from the content of this guideline as these topics have been addressed in a previously published joint guideline by the ESGE and the European Society of Gastrointestinal and Abdominal Radiology (ESGAR)  , and in a dedicated document by the ESGE and United European Gastroenterology  . In addition, patients with genetic or environmental syndromes of CRC, such as Lynch syndrome, serrated polyposis syndrome (SPS), familial adenomatous polyposis (FAP), attenuated FAP (AFAP), and MYH-associated polyposis (MAP), were excluded from this guideline; surveillance in these high risk conditions will be addressed in a future ESGE guideline. Therefore, this guideline applies only to those operated on for sporadic CRC and those in whom a low risk T1 CRC has been completely removed at endoscopy.
The different subgroups developed draft proposals that were presented to the entire group for general discussion during a meeting held in July 2018 in Munich. Further details on the methodology of ESGE guidelines have been reported elsewhere  . In July 2018, a draft prepared by C.H., J.R., L.F., and P.W. was sent to all group members. After the agreement of all group members had been obtained, the manuscript was reviewed by two members of the ESGE governing board and two external reviewers, and was then sent for further comments to the ESGE national societies and individual members. After this it was submitted to Endoscopy for publication.
This guideline was issued in 2018 and will be considered for update in 2023. Any interim updates will be noted on the ESGE website: http://www.esge.com/esge-guidelines.html .
1.1 Surveillance after intent-to-cure surgery
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.
Postoperative surveillance in patients treated for CRC by curative surgery has been investigated in multiple studies using multimodal examination protocols that usually include postoperative colonoscopy         . While the survival benefit associated with intensive multimodal follow-up of CRC patients is questionable     , results of two meta-analyses suggest that inclusion of colonoscopy in the follow-up protocol is associated with lower mortality (as compared to patients followed with surveillance strategies lacking endoscopy), although a frequent colonoscopy does not result in any additional survival benefit   . In another study, colonoscopy was responsible for the detection of the highest proportion of resectable recurrences (44 %) out of all examination modalities  , providing further evidence in favor of colonoscopy surveillance after CRC surgery.
Candidacy for colonoscopic surveillance is often poorly defined. We identified 61 studies that evaluated colonoscopy as a primary method for detection of intraluminal recurrences or metachronous neoplasia in postoperative CRC patients ( Table 1s ). Among 54 studies with full text available, 22 (41 %) enrolled CRC patients after curative surgery (with only six studies offering some definition of the curative treatment       ), 14 (26 %) included patients after intent-to-cure surgery, while 18 (33 %) contained no information on the surgical intent or outcomes. Furthermore, the studies included patients in various CRC stages: 27 (50 %) evaluated patients after treatment of non-metastatic CRC only, 16 (30 %) included some patients treated for metastatic disease (but offered no stratified data on endoscopic surveillance in those patients with metastatic disease), and 11 (20 %) lacked information on the CRC stage.
Little information has been offered on the use of adjuvant treatment and its effect on endoscopic surveillance – six studies presented some data on the use of postoperative treatment and one study reported no association between the use of adjuvant chemotherapy and metachronous neoplasia rates  . There are no data on endoscopic surveillance in CRC patients in palliative care either for the primary CRC or metastatic disease; however, with a median overall survival of 17 months, even after palliative resection of the primary tumor   , these patients are unlikely to benefit from colonoscopic surveillance. Hence, because of a lack of specific data with regard to the influence of surgical intent (curative vs. intent-to-cure), primary disease stage, and oncological therapy on endoscopic surveillance results, we conclude that colonoscopy should be offered to CRC patients in all stages of disease who have undergone intent-to-cure surgery and appropriate oncological treatment.
1.2 Perioperative colonoscopy for CRC surgery
We recommend a high quality perioperative colonoscopy before surgery for CRC or within 6 months following surgery.
Strong recommendation, low quality evidence.
Patients receiving surgery for CRC remain at slightly increased risk of metachronous CRC, with an increase of 1.5 – 2 fold compared with the general population, which corresponds to a 1 % – 2 % long-term risk     . The quality of colonoscopy is likely to play a major role in this risk for the following reasons. First, most of the increased risk appears to be concentrated in the initial 2 – 3 years following surgery     . Second, a substantial proportion of metachronous CRC lesions are diagnosed early after the planned surveillance colonoscopy  . Third, it has been estimated that approximately half of the metachronous CRC risk is related to a lesion that was missed at index colonoscopy  . Fourth, subtle, small or flat morphology lesions – more prone to be missed at baseline examination – were frequently associated with metachronous CRC  . Fifth, metachronous CRC rates appear to be higher in the proximal colon  , the bowel segment where neoplasia detection requires a higher degree of operator competence. Sixth, previous colorectal surgery has been associated with a higher risk of inadequate bowel preparation     . Seventh, a small subset of CRC patients (2 % – 4 %) is affected by synchronous CRC and, when such lesions are missed at index colonoscopy, they may be later misinterpreted as metachronous lesions   .
1.3 Quality of colonoscopy
The quality of colonoscopy has been strongly associated with the risk of post-colonoscopy CRC    . Incomplete colonoscopy, rapid withdrawal time, and suboptimal adenoma detection rate have all been associated with a higher risk of post-colonoscopy CRCs     . Conversely, an improvement in the quality of colonoscopy, along with a meticulous and proficient examination technique have been associated with a substantial reduction in the risk of post-colonoscopy CRC, as well as an increased detection of precancerous lesions    . Although studies in the setting of post-surgical CRC are lacking, an improvement in the quality of colonoscopy is likely to represent the most effective and efficient response to this increased risk of metachronous CRC  .
The ESGE have already provided a detailed document on the quality indicators of colonoscopy, and all of these indicators may be applicable to this specific setting   . Of note, most of these quality indicators require an ongoing audit within the endoscopy center that by itself should represent the main prerequisite in order to achieve high quality of colonoscopy   .
It is beyond the scope of this document to re-address the colonoscopy quality indicators already published by ESGE   . However, our group decided to emphasize the role of split-dose colonoscopy preparation and meticulous examination. First, a randomized study in patients having surgery for CRC has shown the high degree of efficacy of two cleansing regimens – one high volume and one low volume – when delivered in a split-dose regimen  . Second, a higher risk for metachronous CRC located in the proximal colon has been shown in this setting, as well as more frequent flat morphology  . Therefore, a high degree of competence in the detection of these subtle lesions is required, as in the detection of dysplasia in inflammatory bowel disease  or Lynch syndrome  .
Despite the lack of direct evidence, indicators of a quality examination should include a meticulous and slow examination of the mucosa during colonoscope withdrawal, use of high definition colonoscopy, and competence in detecting non-polypoid neoplasia.
Perioperative high quality colonoscopy should ideally be performed prior to surgery. Its clinical relevance relates to accurately locating the CRC lesion (e. g. with use of anatomical landmarks or endoscopic tattooing) for surgical planning, as well as to identifying synchronous lesions that may alter the surgical approach. When synchronous lesions are identified and are located close to the CRC lesion but are not endoscopically removed, it may be useful to place two tattoos, one distally and one proximally to the synchronous lesion(s). Before the patient is entered into a post-surgical surveillance program, complete surgical removal of these synchronous lesions should be completed. When synchronous lesions are found in a bowel segment different from the location of the index CRC, endoscopic resection of these synchronous lesions should be performed before surgery.
In some situations, preoperative colonoscopy may not be feasible. For example, when there is an obstructing CRC, a previous ESGE document recommended presurgical CTC  . In this case, as well as for any other circumstances where the colonoscopy is suboptimal or incomplete, perioperative colonoscopy should be performed very early after surgery, within 6 months at the most, in order to detect possible synchronous invasive or advanced lesions. In particular, if adjuvant chemotherapy is planned, colonoscopy should be performed prior to chemotherapy, but chemotherapy should not be delayed.
We recommend performing surveillance colonoscopy 1 year after CRC surgery.
Strong recommendation, moderate quality evidence.
The two main targets of endoscopic surveillance are early diagnosis of metachronous CRC and/or intraluminal recurrence of the index cancer.
2.1 Metachronous CRC
2.1.1 Epidemiology studies
In a Dutch study with 39 974 person-years of follow-up, the mean annual incidence of metachronous CRC was 0.3 %. This corresponds to a cumulative incidence of 1.1 % at 3 years, 2.0 % at 6 years, and 3.1 % at 10 years (standardized incidence ratio [SIR] 1.3, 95 % confidence interval [CI] 1.1 – 1.5). This difference was observed particularly during the first 3 years following the initial CRC diagnosis (SIR 1.4, 95 %CI 1.1 – 1.8)  . These data were confirmed by an absolute estimate of 1.8 % for metachronous CRCs at 81 months.
In a post hoc analysis of a large clinical study with 15 345 person-years of follow-up, a cumulative incidence of 1.5 % (95 %CI 1.1 % – 2.0 %) was found for metachronous CRC at 5 years, corresponding to an SIR of 1.6 (95 %CI 1.2 – 2.2) as compared to the general population  . In a French study including 61 879 person-years of follow-up, the incidence of metachronous CRC following the diagnosis of an initial CRC was higher than expected (SIR 1.5, 95 %CI 1.3 – 1.7). It remained higher throughout the study period, significantly so between the first and the fifth years following diagnosis (SIR 1.9, 95 %CI 1.6 – 2.3)  . While direct comparisons are lacking, such excessive risk of metachronous cancer compared with the general population would appear to be of the same magnitude as that following resection of high risk precancerous lesions   .
The risk of metachronous CRC appears to be substantially higher in older studies or in those where preoperative colonoscopy was not systematically performed. For instance, in a clinical study from Korea, the risk of metachronous cancer in a population of 1049 subjects followed up for a mean of 41 months was approximately 0.2 % per year  . A similar estimate was observed in smaller Korean and UK studies   . No metachronous cancer was detected in a French series where patients with metachronous cancer detected at perioperative colonoscopy were excluded  .
2.1.2 Endoscopic studies
We recently performed a systematic review of endoscopic studies in the setting of post-CRC surgery, in order to provide a reliable estimate of the adjusted incidence rate of metachronous CRC  . We included 27 studies that enrolled 15 589 patients for a total of 15 803 index CRCs. The mean length of follow-up ranged from 18 to 108 months. The overall cumulative incidence of metachronous CRC was 2.2 % (95 %CI 1.8 % – 2.9 %).
2.1.3 Timing of metachronous CRC
Most studies indicate a higher risk for metachronous CRC in the initial years following surgery. A higher incidence in the first 2 – 3 years of follow-up has been reported in several epidemiological studies       . This finding was also confirmed in our systematic review of endoscopic studies, which clearly showed that the risk of metachronous CRC was highest in the first 36 months following surgical resection and significantly decreased thereafter  . Notably, about half of all metachronous CRCs discovered were diagnosed within 36 months and 70 % within 60 months following surgical resection. This may be related to the quality of perioperative colonoscopy being undefined, as most of the series included in our systematic review commenced enrollment before 2000, with some as early as the 1970 s.
In a large series of 3846 Chinese patients where a perioperative colonoscopy was systematically required to be performed, the majority of CRCs developed after 40 months from the index surgery  . Similarly, other studies have shown low to no risk of early CRC in multiple cohorts with the systematic use of perioperative colonoscopy       ; however, a lead time bias cannot be excluded. For instance, a large study reported an inverse association between the time-interval of surveillance colonoscopy and the risk of metachronous CRC  .
2.1.4 Risk stratification
A few epidemiological and clinical studies have assessed whether the risk of metachronous CRC following surgery differs according to the main clinical or pathological features of the baseline cancer ( Table 2s ). Among the demographic variables, increasing age and sex were assessed and were not related to an increased risk of metachronous CRC       . The site of the primary CRC being located proximally to the splenic flexure was associated with an increased risk of metachronous CRC in a population-based prospective study conducted among 5006 Swiss patients  and in a population-based study comprising 7863 subjects from the USA, Canada, Australia, and New Zealand  . However, a Dutch study including 10 283 patients  , a French study including 10 801 patients  , and a recent Portuguese study including 535 patients  have failed to confirm these findings. Conversely, a Spanish study reported an increased risk of metachronous adenomas and CRCs in patients with left-sided primary tumors  . Absence of a high quality baseline colonoscopy, defined as a complete examination with fair or good bowel cleansing, was linked to an increased risk of metachronous CRC in one small retrospective study  .
In conclusion, data on the risk factors for metachronous CRC are limited and often conflicting, therefore a recommendation for risk stratification for endoscopic surveillance cannot be made in this guideline.
2.1.5 Rate of early stage at diagnosis and cure of metachronous CRC
Studies consistently demonstrate that metachronous CRCs detected during colonoscopy surveillance are less advanced than index cancers and most are early stage lesions that are amenable to reoperation with curative intent                . Kahi et al. performed an analysis of pooled data from 31 studies, which showed that approximately two-thirds of metachronous CRCs are asymptomatic, detected at an early stage (TNM I-II, or Dukes A-B), and operated on with curative intent  . Radical surgery is possible more often for metachronous CRC than for local recurrence (67 % – 86 % vs. 7 % – 22 %, respectively)  . Consequently, the survival from metachronous CRC appears not to be compromised relative to that observed in patients with a single CRC lesion   .
2.2 Intraluminal recurrence
2.2.1 Timing of intraluminal recurrence
According to our meta-analysis, intraluminal CRC recurrences are more frequently detected endoscopically within the first 24 months postoperatively than in the more distant follow-up period  . During the initial 2 years, the cumulative proportion of recurrent intraluminal cancers detected is 70.5 %, with the highest rates being observed 6 – 12 months following CRC resection (recurrence in 1.7 % of patients).
Furthermore, a separate study demonstrated that early postoperative colonoscopy is cost-effective. The number of 1-year colonoscopies needed to detect one CRC and to prevent one CRC-related death was 143 and 926, respectively. Moreover, the incremental cost of performing a 1-year colonoscopy (as compared to not performing it) is $ 40 313 per life-year gained  . Given these results, it appears that early surveillance colonoscopy (performed within 1 year following surgery) is economically justified.
2.2.2 Risk stratification
22.214.171.124 Tumor location Although the incidence of malignant recurrence at the site of surgical anastomosis varies widely, reports consistently demonstrate a higher prevalence of rectal cancer recurrences          than colon cancer recurrences      . It has been estimated that more than 80 % of all malignant recurrences occur in the rectum or distal colon  . This is further supported by the results of a recent meta-analysis that demonstrated a higher rate of endoscopically detected malignant relapses in patients with rectal cancer than with colon cancer (odds ratio [OR] 2.66, 95 %CI 1.31 – 5.41)  . It also appears that the specific rectal cancer location (upper, middle, or lower rectum) is not related to the recurrence risk  . For colon cancer, while one study failed to identify differences between left- and right-sided colonic tumors in terms of recurrence incidence  , others observed that malignant recurrences are more common for primary tumors located in the left side of the colon  .
126.96.36.199 Other risk factors Multiple studies have investigated factors other than tumor location on the risk of anastomotic or intraluminal CRC recurrence, yet they have largely produced inconclusive results ( Table 2s ). For example, tumor size larger than 5 – 6 cm   , stage T3 – T4  , and advanced nodal involvement (N2)  have been reported to influence tumor recurrence rates in rectal cancer, with other studies contradicting these associations   . With regards to histology, degree of differentiation (grade) appears not to influence the risk of malignant recurrence     . Nonetheless, it has been reported that the anastomotic and intraluminal recurrence risks are associated with mucinous differentiation of tumor cells   , lymphovascular invasion (LVI)    , and perineural invasion (PNI)  , with the impact of LVI and PNI in rectal cancer being questioned   .
It has been shown that, in patients undergoing total mesorectal excision, a clear distal margin of < 10 mm is adequate to prevent anastomotic recurrences in rectal cancer     , with Nash et al. reporting otherwise when the margin is smaller than 8 mm  . Although involvement of the circumferential margin is an established risk factor for local relapses in rectal cancer   , it appears not to influence the anastomotic recurrence rates specifically   .
Other factors studied in the context of their influence on anastomotic recurrence risk include intraoperative bowel lavage, use of staplers in rectal cancer surgery     , use of adjuvant treatment     , perioperative complications  , and patient age, among others     . With limited and conflicting evidence on the contribution of these factors to recurrence risk, no position can be taken on their use in stratifying patients with CRC to distinct colonoscopy surveillance strategies.
The main reason to perform surveillance colonoscopy at 1 year following surgical resection (or the perioperative colonoscopy) is the known early (within 12 – 24 months) intraluminal recurrence rate following CRC surgery. A similar pattern of early recurrence has also been demonstrated for metachronous CRC, which therefore further supports an early rather than delayed surveillance colonoscopy.
2.4 Intensive endoscopic surveillance
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.
The benefit associated with intensive multimodality follow-up of postoperative CRC patients remains controversial. Although most individual trials        have failed to demonstrate a survival benefit with intensive follow-up, several older meta-analyses have reported an improvement in overall survival in intensively surveilled populations. Interestingly however there was no improvement in CRC-specific survival     .
In an attempt to bring clarity to this matter, two large follow-up trials were recently performed using computed tomography (CT) and carcinoembryonic antigen (CEA) testing in retrospective  and prospective settings (examinations at 6, 12, 18, 24, and 36 months after surgery in the intensive group vs. at 12 and 36 months after surgery in the routine group)  . These studies failed to demonstrate any benefit of intensive follow-up, either in CRC-specific or overall survival, of patients following curative CRC surgery. The findings are in agreement with the results of a recent meta-analysis  and a Cochrane systematic review  . While the aforementioned studies generally do not contain information on the specific impact of endoscopy on patient outcomes, it is reasonable to assume that the lack of benefit from intensive multimodality follow-up also relates to the absence of benefit from the intensive use of each of the individual examinations, including colonoscopy.
Of the limited number of studies that have separately analyzed colonoscopy follow-up, two meta-analyses have suggested that more frequent endoscopic examination does appear to translate into additional survival benefit   . One randomized controlled trial (RCT) evaluated the role of colonoscopy intensity specifically, performing examinations at 3-monthly intervals for 1 year, at 6-monthly intervals for the next 2 years, and once a year thereafter in an “intensive” follow-up group, and at 6 months, 30 months, and 60 months postoperatively in a “routine” follow-up group  . While the authors of this study reported that more frequent examinations resulted in higher detection rates of asymptomatic recurrence, more curative surgeries, and improved survival in patients who had intraluminal recurrences, they failed to observe improved overall survival in the intensive surveillance group.
Accordingly, in light of the evidence, we deem intensive surveillance in general and intensive endoscopic surveillance in particular not to be justified.
2.5 Second and subsequent colonoscopies
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.
According to epidemiological studies, the long-term risk of metachronous CRC is not, or is only slightly, increased compared with the general population       . As reported above, such risk is mainly concentrated in the early period following surgery, thereby supporting a missed lesion at the time of index colonoscopy being the most plausible reason. The sequence of two high quality colonoscopies – i. e. perioperative and 1 year after CRC surgery – appears to be an effective response to minimize such risk, at least in those patients without additional synchronous or metachronous lesions.
The main reason for subsequent surveillance colonoscopies is therefore that CRC prevention is based on the detection of precancerous lesions. However, unlike in post-polypectomy surveillance, the issue of cancer prevention in CRC patients has rarely been addressed in the literature. Specifically, following CRC surgery, the risk of metachronous advanced adenomas, which may be considered to be a surrogate for CRC prevention, has been estimated in only a few studies and without direct comparison to any reference standard ( Table 3s ). For example, a Korean study estimated a 4.4 % incidence of advanced adenomas at 41 months  . Similarly, a ≤ 10 % risk of advanced neoplasia has been estimated in smaller clinical studies    , with a higher incidence described in patients with a history of left colonic resection   .
These risks appear in general to be lower than, or equivalent to, those reported at post-polypectomy surveillance in patients with high risk adenomas    . As the ESGE guidelines on post-polypectomy surveillance suggest 3-year and 5-year intervals for the first and subsequent surveillance colonoscopies following resection of advanced adenomas  , these same recommendations may be applied following a 1-year surveillance colonoscopy ( [Fig. 1] ).
Fig. 1 Endoscopic surveillance intervals following surgical or endoscopic resection of colorectal cancer. *From the perioperative colonoscopy in those with no preoperative colonoscopy
2.5.1 Metachronous high risk neoplasia
Patients undergoing surgery for CRC may be diagnosed with an advanced adenoma that by itself requires additional surveillance. According to epidemiological studies, 4.5 % of patients with CRC have a synchronous CRC  and approximately 21 % of patients have a synchronous adenoma  . A recent endoscopy-based study found higher percentages of synchronous adenomas and advanced adenomas at 28 % and 19 %, respectively  . Interestingly, these percentages were even higher when the analysis was restricted to high quality baseline colonoscopy, reaching 38 % for adenomas and 27 % for advanced adenomas.
The role of synchronous CRC as a risk factor for metachronous CRC is controversial: some studies have reported synchronous CRC to be associated   with an increased risk of metachronous CRC, while others have not   . Synchronous advanced adenomas have been reported to be associated with an increased probability of metachronous CRC   ; however, this is based on small retrospective studies and therefore no firm conclusion can be drawn.
As a result, it is acceptable to propose a subsequent surveillance colonoscopy at 3 years following the second surveillance colonoscopy in those patients with additional advanced lesions at previous examinations.
2.5.2 Discontinuation of surveillance
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.
In line with what has been reported for post-polypectomy surveillance, endoscopic surveillance is of limited, if any, benefit in patients ≥ 80 years of age owing to the significant risk of competing causes of mortality, such as cardiovascular and other malignant diseases  . This also applies to younger patients with severe comorbidities that affect their expected life-span. Therefore, individualized recommendations should be based on general health status, comorbidity, and the findings at previous colonoscopies.
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.
T1 CRCs are usually classified as high risk T1 CRC if one or more of the following criteria are present: (i) poor differentiation, (ii) deep submucosal invasion (i. e. ≥ 1000 μm, meaning SM2 – 3 in non-pedunculated tumors and Haggitt 4 in pedunculated tumors), (iii) LVI, (iv) intense tumor budding, and (v) resection margins that are positive (R1) or cannot be determined (Rx). When all these factors are absent, T1 CRCs are considered low risk    .
Whereas most of these characteristics are intrinsic to the polyp biology, the resection margin is related to the technique of resection, namely en bloc or piecemeal. The definition of a positive resection margin varies between authors and has been defined as: cancer that is within the diathermy margin, within one high-power field of the margin, ≤ 0.1 mm from the margin, ≤ 1 mm from the margin, or ≤ 2 mm from the margin. Current European guidelines recommend a level of ≤ 1 mm should be considered to represent margin involvement   .
Low risk T1 CRC polyps that are removed endoscopically with clear margins will not need additional surgical resection. There are no data in the literature specifically addressing the question of surveillance following endoscopic resection of pT1 cancer, only data addressing the prognosis of pT1 CRC, from which we can indirectly infer the need for further surveillance.
It is considered that the risk of local and distant recurrence after an R0 resection of a low risk pT1 CRC is negligible  . Asian studies have reported an overall adverse event rate of 0.8 % (1/120) and 1.7 % (1/60) in patients with low risk T1 CRC in whom a “wait-and-see” policy was followed   . In a recent retrospective, multicenter, Dutch cohort study, whose main objective was to assess the incidence of and risk factors for incomplete endoscopic resection of a low risk T1 CRC after a macroscopically complete endoscopic resection, only 1/140 patients had an incomplete histologic resection margin (0.7 %, 95 %CI 0 – 2.1 %)  . Eckhart et al. showed no difference in metachronous disease between patients followed up after benign polyp excision and those followed up for severely dysplastic or malignant polyps  .
In summary, the risk of residual local disease following an R0 endoscopic resection of a low risk T1 CRC appears to be negligible and well offset by the 1-year surveillance recommended for CRC patients in general.
The legal disclaimer for ESGE Guidelines  applies to the current Guideline.
Hassan C, Wysocki PT, Fuccio L et al. Endoscopic surveillance after surgical or endoscopic resection for colorectal cancer: European Society of Gastrointestinal Endoscopy (ESGE) and European Society of Digestive Oncology (ESDO) Guideline Endoscopy 2019, 51: DOI: 10.1055/a-0831-2522
In the above-mentioned article, the text at 2.3 Summary and Figure 1 have been corrected. This was corrected in the online version on February 14, 2019
E. Dekker has provided consultancy to Olympus (2017) and Fujifilm (2016 – 2017), has received a speaker’s fee from Olympus (April 2018), and is a co-editor for Endoscopy . R. Jover is an advisor to Norgine (2010 – 2018) and to Alfa-Sigma (2017 – 2018). T. Ponchon has been on the advisory board of Olympus (2018) and his department has received clinical research funding from Fujifilm (2018). T. Seufferlein is vice-president of the German Cancer Society (2018). J. E. van Hooft received lecture fees from Medtronics (2014 – 2015) and provided consultancy to Boston Scientific (2014 – 2016), her department has received research grants from Cook Medical (2014 – 2018) and Abbott (2014 – 2017). A. Alfieri , M. Dinis-Ribeiro , J.-M. Dumonceau , L. Frazzoni , L. Fuccio , I. Gralnek , C. Hassan , C. Lopes Brandão , M. Pellisé , J. Regula , G. Rosati , C. Senore , C. Spada , E. van Cutsem , and P. Wysocki have no competing interests.
The authors gratefully acknowledge Dr. Enrique Quintero, Gastroenterology Department, University Hospital of the Canary Islands, Tenerife, Spain for his critical review of the guideline.
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Cesare Hassan, MD
Nuovo Regina Margherita Hospital
Via E. Morosini 30