Endoscopic mucosal resection and endoscopic submucosal dissection of epithelial neoplasia of the colon

Endoscopic mucosal resection (EMR) with curative intent has evolved into a safe and effective technique and is currently the gold standard for management of large colonic epithelial neoplasms. Piecemeal EMR is associated with a high risk of local recurrence requiring vigilant surveillance and repeat interventions. Endoscopic submucosal dissection (ESD) was introduced in Japan for the management of early gastric cancer, and has recently been described for en bloc resection of colonic lesions greater than 20 mm. En bloc resection allows accurate histological assessment of the depth of invasion, minimizes the risk of local recurrence and helps determine additional therapy. Morphologic classification of lesions prior to resection allows prediction of depth of invasion and risk of nodal metastasis, allowing selection of the appropriate intervention. This review provides an overview of the assessment of epithelial neoplasms of the colon and the application of EMR and ESD techniques in their management.     

Predictors of bleeding after endoscopic mucosal resection of gastric tumors

BACKGROUND: Endoscopic mucosal resection has been increasingly used to treat gastric tumors. Bleeding is the major complication of endoscopic mucosal resection. This study evaluated risk factors for bleeding associated with endoscopic mucosal resection. METHODS: Four hundred seventy-seven patients who underwent endoscopic mucosal resection of gastric tumors during the past 10 years were studied retrospectively. Bleeding encountered during endoscopic mucosal resection was termed immediate; bleeding after endoscopic mucosal resection was termed delayed. Univariate and multivariate analyses were used for determination of the factors related to delayed bleeding. One case of perforation was excluded. RESULTS: Delayed bleeding occurred in 25 (5.3%) of 476 patients. The only factor found to be significantly different between cases with and without delayed bleeding was the occurrence of immediate bleeding during endoscopic mucosal resection (p < 0.001). Sites where immediate bleeding occurred were not the same as those where delayed bleeding arose. There were no significant differences in other factors. CONCLUSIONS: When immediate bleeding occurs during endoscopic mucosal resection, there is an increased risk of delayed bleeding.     

Indications and limitations of endoscopic mucosal resection in gastric cancer]

Endoscopic mucosal resection (EMR) has come to play an increasingly important role in treatment of early cancer in gastrointestinal tract. Recent advances in EMR are very remarkable. These allow minimally invasive treatment of diseases that would otherwise require major surgery. The most important factors of EMR are accuracy and safety. Further improvement in both staging and resection technologies, as well as safety and short procedure time will ultimately conspire to make this an even more effective tool in the management of early cancer in gastrointestinal tract. EMR must prove to be safe for the majority of patients when performed by competent endoscopist. The new techniques will continue to solve the limitations of endoscopic treatment and its use will also continue to expand increasingly. Also, further studies are required to refine and standardize EMR. As EMR technology becomes more complex, necessitating the use of multiple accessories simultaneously, technical ease may be enhanced by simple adjunct devices. The future of EMR depends on extending its boundaries safely in a controlled setting of prospective clinical trials. I believe that current EMR techniques and devices are only the beginning of a new age in therapeutic endoscopy, the age of minimal invasive endosurgery, the next frontier.     

Superselective transcatheter embolization for acute lower gastrointestinal hemorrhage after endoscopic mucosal resection: a report of 3 cases

One of the most common complications related to endoscopic mucosal resection is hemorrhage; in almost every case, the bleeding is endoscopically managed, but some cases are unresponsive to the treatment. We have encountered three cases of endoscopically uncontrollable lower gastrointestinal hemorrhage after endoscopic mucosal resection in the colon which we successfully treated by urgent superselective transcatheter embolization. In our three cases, massive hemorrhage occurred immediately after endoscopic mucosal resection of a sessile polyp 25-40 mm in diameter, two cases in the ascending colon and one in the rectum. Although hemoclip placement was attempted in every case, hemostasis was not achieved. Emergency angiography disclosed massive extravasation of the contrast material in the colon. Hemostasis was achieved immediately after superselective transcatheter arterial embolizations with microcoils, with no observable ischemic complications and without the need of transfusions. In conclusion, superselective transcatheter embolization with microcoils should be considered a safe and efficient treatment option for endoscopically uncontrollable lower gastrointestinal hemorrhage occurring after endoscopic mucosal resection.     

Colon mucosal neoplasia referred for endoscopic mucosal resection: Recurrence of adenomas and prediction of submucosal invasion

BACKGROUND Endoscopic mucosal resection(EMR) is an effective and minimally invasive alternative to surgery for large polyps and laterally spreading lesions. Gross morphology and surface characteristics may help predict submucosal invasion of the lesion(SMIL) during endoscopic evaluation. This is one of the largest singlecenter studies reporting endoscopic mucosal resection for larger(≥ 20 mm) colorectal lesions in the United States.AIM To determine the recurrence rate of adenomas and endoscopic features that may predict submucosal invasion of colonic mucosal neoplasia.METHODS This is a retrospective cohort study of all the patients referred for endoscopic mucosal resection for lesions ≥ 20 mm, spanning a period from January 2013 to February 2017. The main outcome measure was identifying features that may predict submucosal invasion of mucosal lesions and predict recurrence of adenomas on follow-up surveillance colonoscopy performed at 4-6 mo.RESULTS A total of 480 patients with 500 lesions were included in the study. The median age was 68(Inter quantile range: 14) with 52% males. The most common lesion location was ascending colon(161; 32%). Paris classification 0-IIa(Flat elevation of mucosa-316; 63.2%); Kudo Pit Pattern IIIs(192; 38%) and Granular surface morphology(260; 52%) were most prevalent. Submucosal invasion was present in 23(4.6%) out of 500 lesions. The independent risk factors for SMIL were Kudo Pit Pattern IIIL + IV and V(Odds ratio: 4.5; P value 0.004) and Paris classification 0-IIc(Odds ratio: 18.2; P value 0.01). Out of 500, 354 post-endoscopic mucosal resection scars were examined at surveillance colonoscopy. Recurrence was noted in 21.8%(77 cases).CONCLUSION There was overall low prevalence of SMIL in our study. Kudo pit pattern(IIIL + IV and V) and Paris classification 0-IIc were the only factors identified as an independent risk factor for submucosal invasion. The independent risk factor for recurrence was adenoma size( 40 mm). Almost all recurrences(98.8%) were treated endoscopically.     

Ligation-assisted endoscopic mucosal resection of gastric heterotopic pancreas

Heterotopic pancreas is a congenital anomaly characterized by ectopic pancreatic tissue. Treatment of heterotopic pancreas may include expectant observation, endoscopic resection or surgery. The aim of this report was to describe the technique of ligationassisted endoscopic mucosal resection （EMR） for resection of heterotopic pancreas of the stomach. Two patients （both female, mean age 32 years） were referred for management of gastric subepithelial tumors. Endoscopic ultrasound in both disclosed small hypoechoic masses in the mucosa and submucosa. Band ligation-assisted EMR was performed in both cases without complications. Pathology from the resected tumors revealed heterotopic pancreas arising from the submucosa. Margins were free of pancreatic tissue. Ligation-assisted EMR is technically feasible and may be considered for the endoscopic management of heterotopic pancreas.     

内镜下黏膜切除术治疗胃肠道息肉样病变的70例临床分析

目的 探讨内镜下黏膜切除术（ endoscopic mucosal resection,EMR） 在切除胃肠道息肉中的应用价值.方法 回顾性分析70例（82枚息肉）行EMR治疗胃肠道息肉的临床资料.结果 30例患者40枚胃息肉及40例患者42枚结肠息肉经EMR 治疗后,病变均完整切除,无出血、感染和穿孔等并发症发生.结论 EMR是临床上治疗胃肠道息肉的一种安全有效的内镜治疗手段,值得临床推广.     

Risk factors for bleeding after endoscopic mucosal resection

AIM: To clarify the risk factors for bleeding after endoscopic mucosal resection (EMR). METHODS: A total of 297 consecutive patients who underwent EMR were enrolled. Some of the patients had multiple lesions. Bleeding requiring endoscopic treatment was defined as bleeding after EMR. Odds ratios (OR) with 95% confidence intervals (CI), calculated by logistic regression with multivariate adjustments for covariates, were the measures of association. RESULTS: Of the 297 patients, 57 (19.2%) patients with bleeding after EMR were confirmed. With multivariate adjustment, the cutting method of EMR, diameter, and endoscopic pattern of the tumor were associated with the risk of bleeding after EMR. The multivariate-adjusted OR for bleeding after EMR using endoscopic aspiration mucosectomy was 3.07 (95%CI, 1.59-5.92) compared with strip biopsy. The multiple-adjusted OR for bleeding after EMR for the highest quartile (16-50 mm) of tumor diameter was 5.63 (95%CI, 1.84-17.23) compared with that for the lowest (4-7 mm). The multiple-adjusted OR for bleeding after EMR for depressed type of tumor was 4.21 (95%CI, 1.75-10.10) compared with elevated type. CONCLUSION: It is important to take tumor characteristics (tumor size and endoscopic pattern) and cutting method of EMR into consideration in predicting bleeding after EMR.     

Grasper type scissors for endoscopic submucosal dissection of gastric epithelial neoplasia

AIM:To evaluate the efficacy and safety of grasper type scissors(GTS)for endoscopic submucosal dissection(ESD)of gastric epithelial neoplasia.METHODS:The study was performed by 4 endoscopists in 4 institutions affiliated to The Catholic University of Korea.ESD was performed in 76 consecutive patients with gastric epithelial neoplasia by using the GTS(37 patients)or the hook knife plus coagrasper(HKC)(39 patients).The complete resection rate,complication rate,total time elapsed and elapsed time per square centimeter of the dissected specimen were analyzed between the GTS and HKC group.RESULTS:The mean age of the GTS group was 62.3±11.4 years and mean age of the HKC group was 65.6±10.1 years.Differentiated adenocarcinoma was found in32.4%in the GTS group and 33.3%in the HKC group.The procedures were performed without interruption in every case in both groups.The en bloc resection rates of both groups were 100%.The total time elapsed during the procedure was 44.54±21.72 min in the GTS group and 43.77±21.84 min in the HKC group(P=0.88)and the time elapsed per square centimeter of the resected lesion was 7.53±6.35 min/cm2in the GTS group and 6.92±5.93 min/cm2in the HKC group(P=0.66).The overall complication rate was not significantly different between the two groups.CONCLUSION:GTS is a safe and effective device for ESD compared with HKC.ESD can be performed with GTS alone,which can reduce the costs for ESD.     

胃上皮内瘤变内镜活组织检查与内镜切除标本病理结果差异分析

目的 分析比较我国胃镜活组织检查（简称活检）和内镜下切除病理诊断胃上皮内瘤变的可靠性。 方法 回顾性分析2010年1月至2015年3月北京协和医院胃镜活检病理诊断为胃上皮内瘤变的98例患者,包括20例低级别上皮内瘤变（LGIN）,65例高级别上皮内瘤变（HGIN）和13例早期胃癌（EGC）。患者均行内镜下切除,结合患者临床资料,对活检病理与内镜下切除病理差异率、临床特征和差异因素进行分析。 结果 20例活检病理为LGIN的患者,内镜下切除后有12例病理结果较活检病理进展,其中7例HGIN（差异率35.0％,7／20）,5例EGC（25.0％,5／20）。活检病理诊断HGIN的65例患者,内镜切除后38例诊断为EGC（58.5％,38／65）,4例诊断为LGIN（6.2％,4／65）。13例活检诊断为EGC者切除后病理维持原诊断。活检病理和内镜切除病理诊断的总体差异率为55.1％（54／98）。病变直径＞2 cm,病变表面充血是活检和内镜切除病理差异的主要因素（P＜0.05）。 结论 内镜活检病理诊断胃上皮内瘤变的可靠性欠佳,内镜下切除不仅是治疗胃上皮内瘤变的主要手段,也是明确组织学诊断的一个重要方法。     

Endoscopic submucosal dissection compared to endoscopic mucosal resection for early Barrett esophagus neoplasia

Endoscopic resection has become an invaluable diagnostic and therapeutic tool in the evaluation and management of early Barrett esophagus (BE) neoplasia. While endoscopic mucosal resection (EMR) is the current standard of care for the resection of nodular early BE neoplasia, endoscopic submucosal dissection (ESD) has been recently introduced as part of the armamentarium in the treatment of these lesions. The potential advantages of ESD compared to EMR include higher en-bloc and R0 resection rates, decreased local recurrence, and the procurement of large en-bloc specimens that may facilitate pathologic staging. On the other hand, EMR is less time-consuming and has been traditionally associated with a lower incidence of serious adverse events when compared to ESD. At present, the choice of the endoscopic resection technique hinges on operator’s preferences, patient and lesions characteristics and available local expertise. Future high-quality studies comparing clinical outcomes between ESD and EMR are needed to better define their roles in the management of early BE neoplasia.     

Wide field endoscopic resection for advanced colonic mucosal neoplasia: current status and future directions

Most colonic adenomas are ≤10 mm and are routinely treated by colonoscopic polypectomy with long-term health benefits. Nonpolypoid lesions ≥20 mm, whether sessile or flat and laterally spreading, are forms of advanced mucosal neoplasia that cannot be managed by conventional polypectomy and are often referred for surgery. However, the majority of these lesions when carefully assessed are found to be noninvasive and can be safely and effectively treated by advanced endoscopic techniques including endoscopic mucosal resection or endoscopic submucosal dissection with resultant cost, morbidity, and mortality benefits. Lesion assessment is a critical component. Enhanced imaging methods provide the opportunity for accurate pathological characterization, informing treatment decisions, without the need for previous histologic confirmation. Techniques of advanced endoscopic resection are still in evolution and further improvements, including hybrid techniques, bringing less technically challenging and shorter procedures with superior safety can be reasonably expected in the next decade. Safety is a fundamental consideration. Methods of early recognition of complications, risk stratification, and management pathways are being developed and refined. Standardization, validation, and adoption of these technological developments will improve endoscopic interpretation and therapy and in combination with an increased understanding of adenoma molecular biology, will result in a progressively more individualized lesion-specific endoscopic approach. The future of advanced endoscopic resection in the colon is promising, and the next few years should see the boundaries of endoscopic resection expand well beyond the limits of what we know today.     

Incidence and risk factors of advanced neoplasia after endoscopic mucosal resection of colonic laterally spreading lesions

Purpose

To investigate advanced neoplasia (AN) after endoscopic mucosal resection (EMR) of colonic laterally spreading lesions (LSLs).

Methods

A retrospective study of patients who underwent injection-assisted EMR of colonic LSLs ≥?10 mm was performed. Primary outcome was overall rate of AN at initial surveillance colonoscopy. Secondary outcomes were the rates of residual AN (rAN) at the EMR site and metachronous AN (mAN), and analysis of risk factors for AN, including effect of surveillance guidance.

Results

Three hundred seventy-four patients underwent successful EMR for 388 LSLs. AN occurred in 66/374 (17.6%) patients on initial surveillance colonoscopy at median follow-up of 364.5 days. Two patients had both rAN and mAN, for a total of 68 instances of AN, including 30/374 (8.0%) cases of rAN and 38/374 (10.2%) cases of mAN. On multivariate analysis, use of piecemeal resection was associated with increased likelihood of residual AN (P?=?0.003, OR 9.2, 95% CI 2.1–33.3). Twenty-nine out of thirty cases (96.7%) of rAN were successfully endoscopically managed at surveillance colonoscopy.

Conclusions

AN occurred in 17.6% of all patients at initial surveillance colonoscopy at a median of 1 year after EMR. Roughly half of the instances of AN were metachronous lesions. Our data support a 1-year surveillance interval after EMR of LSLs ≥?10 mm with careful inspection of the entire colon, not just the prior resection site.

     

Safer endoscopic gastric mucosal resection: preoperative proton pump inhibitor administration

BACKGROUND AND AIM: Control of bleeding is crucial in improving the safety of endoscopic mucosal resection (EMR), and intragastric acidity has a great impact on hemostasis and blood coagulation. Proton pump inhibitors (PPI) are potent suppressors of gastric acid; however, PPI need to be continuously administered orally for several days, and thus initial effects may be insufficient if PPI is only administered immediately after EMR. The aim of this study was to determine whether preoperative administration of PPI prior to EMR can elevate intragastric acidity, facilitate better control of intraoperative bleeding (complete coagulation and hemostasis), prevent postoperative bleeding, and facilitate healing of artificial ulcers. METHODS: A randomized clinical study was conducted in which EMR was performed with or without 1 week of preoperative PPI administration. RESULTS: Artificial ulcers created by EMR healed more rapidly in patients who received preoperative PPI. CONCLUSIONS: The results of the study suggest that preoperative administration of PPI before EMR is useful for controlling and preventing bleeding, and for facilitating the healing of artificial ulcers.