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      Detection and miss rates of autofluorescence imaging of adenomatous and polypoid lesions during colonoscopy: a systematic review and meta-analysis

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          Background and study aims: Autofluorescence imaging (AFI) is an endoscopic imaging technique used to increase the detection of premalignant gastrointestinal lesions, and it has gradually become popular in recent years. This meta-analysis was performed to examine whether AFI provides greater efficacy in the detection of adenomatous and polypoid lesions and can even prevent the failure to detect a single adenoma or polyp. The aim of the study was to systematically review the efficacy of AFI in increasing detection rates and decreasing miss rates.

          Methods: Pertinent articles were identified through a search of databases up to December 2013 that included patients who had undergone two same-day colonoscopies (AFI and white light endoscopy [WLE]), followed by polypectomy. Fixed and random effects models were used to detect significant differences between AFI and WLE in regard to adenoma detection rate (ADR), polyp detection rate (PDR), adenoma miss rate (AMR), polyp miss rate (PMR), and procedural time.

          Results: A total of 1199 patients from six eligible studies met the inclusion criteria. No significant differences were found in ADR (odds ratio [OR] 1.01; 95 % confidence interval [95 %CI] 0.74 – 1.37), PDR (OR 0.86; 95 %CI 0.57 – 1.30), or advanced ADR (OR 1.22; 95 %CI 0.69 – 2.17). The AMR (OR 0.62; 95 %CI 0.44 – 0.86) and PMR (OR 0.64; 95 %CI 0.48 – 0.85) by AFI were significantly lower than those by WLE. The procedural time of AFI was significantly longer than that of WLE (mean 8.00 minutes; 95 %CI 1.59 – 14.41). Subgroup meta-analysis for the other characteristics was not performed because of insufficiency of the primary data.

          Conclusions: AFI decreases AMR and PMR significantly compared with WLE but does not improve ADR or PDR. AMR and PMR may be decreased by using AFI in flat and small lesions or when less experienced endoscopists perform the procedure.

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          Most cited references 23

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          Preferred reporting items for systematic reviews and meta-analyses: the PRISMA statement.

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            Prevention of colorectal cancer by colonoscopic polypectomy. The National Polyp Study Workgroup.

            The current practice of removing adenomatous polyps of the colon and rectum is based on the belief that this will prevent colorectal cancer. To address the hypothesis that colonoscopic polypectomy reduces the incidence of colorectal cancer, we analyzed the results of the National Polyp Study with reference to other published results. The study cohort consisted of 1418 patients who had a complete colonoscopy during which one or more adenomas of the colon or rectum were removed. The patients subsequently underwent periodic colonoscopy during an average follow-up of 5.9 years, and the incidence of colorectal cancer was ascertained. The incidence rate of colorectal cancer was compared with that in three reference groups, including two cohorts in which colonic polyps were not removed and one general-population registry, after adjustment for sex, age, and polyp size. Ninety-seven percent of the patients were followed clinically for a total of 8401 person-years, and 80 percent returned for one or more of their scheduled colonoscopies. Five asymptomatic early-stage colorectal cancers (malignant polyps) were detected by colonoscopy (three at three years, one at six years, and one at seven years). No symptomatic cancers were detected. The numbers of colorectal cancers expected on the basis of the rates in the three reference groups were 48.3, 43.4, and 20.7, for reductions in the incidence of colorectal cancer of 90, 88, and 76 percent, respectively (P < 0.001). Colonoscopic polypectomy resulted in a lower-than-expected incidence of colorectal cancer. These results support the view that colorectal adenomas progress to adenocarcinomas, as well as the current practice of searching for and removing adenomatous polyps to prevent colorectal cancer.
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              Colonoscopic polypectomy and long-term prevention of colorectal-cancer deaths.

              In the National Polyp Study (NPS), colorectal cancer was prevented by colonoscopic removal of adenomatous polyps. We evaluated the long-term effect of colonoscopic polypectomy in a study on mortality from colorectal cancer. We included in this analysis all patients prospectively referred for initial colonoscopy (between 1980 and 1990) at NPS clinical centers who had polyps (adenomas and nonadenomas). The National Death Index was used to identify deaths and to determine the cause of death; follow-up time was as long as 23 years. Mortality from colorectal cancer among patients with adenomas removed was compared with the expected incidence-based mortality from colorectal cancer in the general population, as estimated from the Surveillance Epidemiology and End Results (SEER) Program, and with the observed mortality from colorectal cancer among patients with nonadenomatous polyps (internal control group). Among 2602 patients who had adenomas removed during participation in the study, after a median of 15.8 years, 1246 patients had died from any cause and 12 had died from colorectal cancer. Given an estimated 25.4 expected deaths from colorectal cancer in the general population, the standardized incidence-based mortality ratio was 0.47 (95% confidence interval [CI], 0.26 to 0.80) with colonoscopic polypectomy, suggesting a 53% reduction in mortality. Mortality from colorectal cancer was similar among patients with adenomas and those with nonadenomatous polyps during the first 10 years after polypectomy (relative risk, 1.2; 95% CI, 0.1 to 10.6). These findings support the hypothesis that colonoscopic removal of adenomatous polyps prevents death from colorectal cancer. (Funded by the National Cancer Institute and others.).

                Author and article information

                Endosc Int Open
                Endosc Int Open
                Endoscopy International Open
                © Georg Thieme Verlag KG (Stuttgart · New York )
                June 2015
                07 May 2015
                : 3
                : 3
                : E226-E235
                [1 ]Department of Colorectal Surgery, Changhai Hospital, Second Military Medical University, Shanghai, China
                [2 ]Department of Surgery, No. 273 Hospital of People’s Liberation Army, Korla, Xinjiang Autonomous Region, China
                [3 ]Medical Team, Unit 66013 of People’s Liberation Army, Shijiazhuang, Hebei Province, China
                [4 ]Department of Gastroenterology, Air Force General Hospital of People’s Liberation Army, Beijing, China
                [5 ]Department of General Surgery, Shengyang General Hospital of People’s Liberation Army, Shenyang, Liaoning Province, China
                [6 ]Center of Digestive Endoscopy, Changhai Hospital, Second Military Medical University, Shanghai, China
                Author notes
                Corresponding author En-Da Yu, MD Department of Colorectal Surgery Changhai Hospital 168 Changhai RoadShanghaiChina 200433+86-21-31161613 endayu@
                © Thieme Medical Publishers


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