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Tan C, Qin G, Wang QQ, Zhou YC, Yao SK. Clinicopathologic and endoscopic features of sessile serrated lesions and conventional adenomas: a large inpatient population-based study in China. Front Oncol 2024; 14:1337035. [PMID: 38638861 PMCID: PMC11024220 DOI: 10.3389/fonc.2024.1337035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2023] [Accepted: 03/22/2024] [Indexed: 04/20/2024] Open
Abstract
Objectives Sessile serrated lesions (SSLs) are precursors of sporadic colorectal cancer (CRC) and have distinct characteristics compared with conventional adenomas (CAs). Several lifestyle and environmental factors may play critical roles in the development of advanced lesions. Our aim is to describe the features of SSLs and CAs and further explore risk factors for advanced lesions. Methods This is an observational study that collected demographic, endoscopic, and histological data from the China-Japan Friendship Hospital among the inpatient population with pathologically reported as SSL or CA between 2015 and 2022. We analyzed the clinicopathology and endoscopic differences between SSL alone, CA alone, and synchronous SSL+CA groups, and identified risk factors using multiple regression analysis. Results A total of 9236 polyps from 6598 patients were included in the cohort. Patients with SSL+CA were more likely to be older (p=0.008), while individuals with SSL alone had a higher proportion of early-onset polyps (p<0.001), and SSLs were more common in advanced polyps than CAs (p<0.001). A greater proportion of advanced polyps in the SSL and CA groups were diagnosed as Yamada III, Yamada IV, and laterally spreading tumor (p=0.002, p<0.001, respectively), and multiple SSLs and CAs were more represented in nonadvanced polyps than in advanced polyps. In multiple regression analysis, older patients were more likely to develop advanced SSLs (aOR 1.05, 95% CI 1.02-1.09, p=0.005). Conclusion SSLs and CAs have diverse demographic, endoscopic, and histological characteristics, and their advanced lesions share different risk factors, which advances the understanding of the etiology and progression of SSLs.
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Affiliation(s)
- Chang Tan
- Graduate School, Peking University China-Japan Friendship School of Clinical Medicine, Beijing, China
| | - Geng Qin
- Department of Gastroenterology, China-Japan Friendship Hospital, Beijing, China
| | - Qian-Qian Wang
- Graduate School, Peking University China-Japan Friendship School of Clinical Medicine, Beijing, China
| | - Yuan-Chen Zhou
- Graduate School, Peking University China-Japan Friendship School of Clinical Medicine, Beijing, China
| | - Shu-Kun Yao
- Graduate School, Peking University China-Japan Friendship School of Clinical Medicine, Beijing, China
- Department of Gastroenterology, China-Japan Friendship Hospital, Beijing, China
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2
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Zhang S, Fu Y, Zhang X, Xie T, Zhao Z, Liao H. A novel endoscopy image fusion system: combine white light imaging and compound band imaging. Int J Comput Assist Radiol Surg 2024; 19:331-344. [PMID: 37603164 DOI: 10.1007/s11548-023-02988-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2023] [Accepted: 06/14/2023] [Indexed: 08/22/2023]
Abstract
PURPOSE White light imaging (WLI) is a commonly seen examination mode in endoscopy. The particular light in compound band imaging (CBI) can highlight delicate structures, such as capillaries and tiny structures on the mucosal surface. These two modes complement each other, and doctors switch between them manually to complete the examination. This paper proposes an endoscopy image fusion system to combine WLI and CBI. METHODS We add a real-time rotatable color wheel in the light source device of the AQ-200 endoscopy system to achieve rapid imaging of two modes at the same position of living tissue. The two images corresponding to the pixel level can avoid registration and lay the foundation for image fusion. We propose a multi-scale image fusion framework, which involves Laplacian pyramid (LP) and convolutional sparse representation (CSR) and strengthens the details in the fusion rule. RESULTS Volunteer experiments and ex vivo pig stomach trials are conducted to verify the feasibility of our proposed system. We also conduct comparative experiments with other image fusion methods, evaluate the quality of the fused images, and verify the effectiveness of our fusion framework. The results show that our fused image has rich details, high color contrast, apparent structures, and clear lesion boundaries. CONCLUSION An endoscopy image fusion system is proposed, which does not change the doctor's operation and makes the fusion of WLI and CBI optical staining technology a reality. We change the light source device of the endoscope, propose an image fusion framework, and verify the feasibility and effectiveness of our scheme. Our method fully integrates the advantages of WLI and CBI, which can help doctors make more accurate judgments than before. The endoscopy image fusion system is of great significance for improving the detection rate of early lesions and has broad application prospects.
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Affiliation(s)
- Shipeng Zhang
- Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing, 100084, China
| | - Ye Fu
- Department of Biomedical Engineering, College of Future Technology, Peking University, Beijing, 100871, China
| | - Xinran Zhang
- Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing, 100084, China
| | - Tianyu Xie
- Department of Biomedical Engineering, College of Future Technology, Peking University, Beijing, 100871, China
| | - Zhe Zhao
- Beijing Tsinghua Changgung Hospital, Beijing, 102218, China.
- School of Clinical Medicine, Tsinghua University, Beijing, 100084, China.
| | - Hongen Liao
- Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing, 100084, China.
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Utsumi T, Yamada Y, Diaz-Meco MT, Moscat J, Nakanishi Y. Sessile serrated lesions with dysplasia: is it possible to nip them in the bud? J Gastroenterol 2023; 58:705-717. [PMID: 37219625 PMCID: PMC10366009 DOI: 10.1007/s00535-023-02003-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Accepted: 05/14/2023] [Indexed: 05/24/2023]
Abstract
The serrated neoplasia pathway constitutes an "alternative route" to colorectal cancer (CRC), and sessile serrated lesions with dysplasia (SSLDs) are an intermediate step between sessile serrated lesions (SSLs) and invasive CRC in this pathway. While SSLs show indolent growth before becoming dysplastic (> 10-15 years), SSLDs are considered to rapidly progress to either immunogenic microsatellite instable-high (MSI-H) CRC (presumably 75% of cases) or mesenchymal microsatellite stable (MSS) CRC. Their flat shapes and the relatively short window of this intermediate state make it difficult to detect and diagnose SSLDs; thus, these lesions are potent precursors of post-colonoscopy/interval cancers. Confusing terminology and the lack of longitudinal observation data of serrated polyps have hampered the accumulation of knowledge about SSLDs; however, a growing body of evidence has started to clarify their characteristics and biology. Together with recent efforts to incorporate terminology, histological studies of SSLDs have identified distinct dysplastic patterns and revealed alterations in the tumor microenvironment (TME). Molecular studies at the single-cell level have identified distinct gene alterations in both the epithelium and the TME. Mouse serrated tumor models have demonstrated the importance of TME in disease progression. Advances in colonoscopy provide clues to distinguish pre-malignant from non-malignant-SSLs. Recent progress in all aspects of the field has enhanced our understanding of the biology of SSLDs. The aim of this review article was to assess the current knowledge of SSLDs and highlight their clinical implications.
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Affiliation(s)
- Takahiro Utsumi
- Department of Gastroenterology and Hepatology, Kyoto University Graduate School of Medicine, 54 Kawaharacho, Shogoin, Sakyo-Ku, Kyoto, 606-8507, Japan
| | - Yosuke Yamada
- Department of Diagnostic Pathology, Kyoto University Hospital, Kyoto, Japan
| | - Maria Teresa Diaz-Meco
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York City, NY, USA
| | - Jorge Moscat
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York City, NY, USA
| | - Yuki Nakanishi
- Department of Gastroenterology and Hepatology, Kyoto University Graduate School of Medicine, 54 Kawaharacho, Shogoin, Sakyo-Ku, Kyoto, 606-8507, Japan.
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Hirata D, Kashida H, Matsumoto T, Ebisutani C, Teramoto A, Iwatate M, Hattori S, Fujita M, Sano W, Komeda Y, Sano Y, Murakami Y, Kudo M. A Multicenter Prospective Validation Study on Selective Endoscopic Resection of Sessile Serrated Lesions Using Magnifying Colonoscopy in Clinical Practice. Digestion 2023; 104:262-269. [PMID: 36649681 PMCID: PMC10534952 DOI: 10.1159/000527978] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/02/2022] [Accepted: 11/03/2022] [Indexed: 01/19/2023]
Abstract
INTRODUCTION Sessile serrated lesions (SSLs) have malignant potential for colorectal cancer in the serrated pathway. Selective endoscopic resection of SSLs would reduce medical costs and procedure-related accidents, but the accurate endoscopic differentiation of SSLs from hyperplastic polyps (HPs) is challenging. To explore the differential diagnostic performance of magnifying colonoscopy in distinguishing SSLs from HPs, we conducted a multicenter prospective validation study in clinical practice. METHODS Considering the rarity of diminutive SSLs, all lesions ≥6 mm that were detected during colonoscopy and diagnosed as type 1 based on the Japan narrow-band imaging expert team (JNET) classification were included in this study. Twenty expert endoscopists were asked to differentiate between SSLs and HPs with high or low confidence level after conventional and magnifying NBI observation. To examine the validity of selective endoscopic resection of SSLs using magnifying colonoscopy in clinical practice, we calculated the sensitivity of endoscopic diagnosis of SSLs with histopathological findings as comparable reference. RESULTS A total of 217 JNET type 1 lesions from 162 patients were analyzed, and 114 lesions were diagnosed with high confidence. The sensitivity of magnifying colonoscopy in detecting SSLs was 79.8% (95% confidence interval [CI]: 74.7-84.4%) overall, and 82.4% (95% CI: 76.1-87.7%) in the high-confidence group. These results showed that the sensitivity of this study was not high enough, even limited in the high-confidence group. CONCLUSIONS Accurate differential diagnosis of SSLs and HPs using magnifying colonoscopy was challenging even for experts. JNET type 1 lesions ≥6 mm are recommended to be resected because selective endoscopic resection has a disadvantage of leaving approximately 20% of SSLs on site.
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Affiliation(s)
- Daizen Hirata
- Gastrointestinal Center and Institute of Minimally-Invasive Endoscopic Care (iMEC), Sano Hospital, Kobe, Japan
- Department of Gastroenterology and Hepatology, Kindai University, Osakasayama, Osaka, Japan
| | - Hiroshi Kashida
- Department of Gastroenterology and Hepatology, Kindai University, Osakasayama, Osaka, Japan
| | - Tsuguhiro Matsumoto
- Department of Gastroenterology, Akashi City Hospital, Akashi, Japan
- Department of Gastroenterology, Nakayama Clinic, Akashi, Japan
| | - Chikara Ebisutani
- Department of Gastroenterology, Hyogo Prefectural Kakogawa Medical Center, Kakogawa, Japan
- Hiyodori Clinic, Kobe, Japan
| | - Akira Teramoto
- Gastrointestinal Center and Institute of Minimally-Invasive Endoscopic Care (iMEC), Sano Hospital, Kobe, Japan
- Third Department of Internal Medicine, Toyama University Hospital, Toyama, Japan
| | - Mineo Iwatate
- Gastrointestinal Center and Institute of Minimally-Invasive Endoscopic Care (iMEC), Sano Hospital, Kobe, Japan
| | - Santa Hattori
- Gastrointestinal Center and Institute of Minimally-Invasive Endoscopic Care (iMEC), Sano Hospital, Kobe, Japan
| | - Mikio Fujita
- Gastrointestinal Center and Institute of Minimally-Invasive Endoscopic Care (iMEC), Sano Hospital, Kobe, Japan
| | - Wataru Sano
- Gastrointestinal Center and Institute of Minimally-Invasive Endoscopic Care (iMEC), Sano Hospital, Kobe, Japan
| | - Yoriaki Komeda
- Department of Gastroenterology and Hepatology, Kindai University, Osakasayama, Osaka, Japan
| | - Yasushi Sano
- Gastrointestinal Center and Institute of Minimally-Invasive Endoscopic Care (iMEC), Sano Hospital, Kobe, Japan
- Kansai Medical University, Hirakata, Japan
| | | | - Masatoshi Kudo
- Department of Gastroenterology and Hepatology, Kindai University, Osakasayama, Osaka, Japan
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Teramoto A, Hamada S, Ogino B, Yasuda I, Sano Y. Updates in narrow-band imaging for colorectal polyps: Narrow-band imaging generations, detection, diagnosis, and artificial intelligence. Dig Endosc 2022; 35:453-470. [PMID: 36480465 DOI: 10.1111/den.14489] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Accepted: 12/01/2022] [Indexed: 01/20/2023]
Abstract
Narrow-band imaging (NBI) is an optical digital enhancement method that allows the observation of vascular and surface structures of colorectal lesions. Its usefulness in the detection and diagnosis of colorectal polyps has been demonstrated in several clinical trials and the diagnostic algorithms have been simplified after the establishment of endoscopic classifications such as the Japan NBI Expert Team classification. However, there were issues including lack of brightness in the earlier models, poor visibility under insufficient bowel preparation, and the incompatibility of magnifying endoscopes in certain endoscopic platforms, which had impeded NBI from becoming standardized globally. Nonetheless, NBI continued its evolution and the newest endoscopic platform launched in 2020 offers significantly brighter and detailed images. Enhanced visualization is expected to improve the detection of polyps while universal compatibility across all scopes including magnifying endoscopy will promote the global standardization of magnifying diagnosis. Therefore, knowledge related to magnifying colonoscopy will become essential as magnification becomes standardly equipped in future models, although the advent of computer-aided diagnosis and detection may greatly assist endoscopists to ensure quality of practice. Given that most endoscopic departments will be using both old and new models, it is important to understand how each generation of endoscopic platforms differ from each other. We reviewed the advances in the endoscopic platforms, artificial intelligence, and evidence related to NBI essential for the next generation of endoscopic practice.
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Affiliation(s)
- Akira Teramoto
- Third Department of Internal Medicine, Toyama University Hospital, Toyama, Japan
| | - Seiji Hamada
- Gastrointestinal Center, Urasoe General Hospital, Okinawa, Japan
| | - Banri Ogino
- Third Department of Internal Medicine, Toyama University Hospital, Toyama, Japan
| | - Ichiro Yasuda
- Third Department of Internal Medicine, Toyama University Hospital, Toyama, Japan
| | - Yasushi Sano
- Gastrointestinal Center, Sano Hospital, Hyogo, Japan
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Iwatate M, Hirata D, Francisco CPD, Co JT, Byeon J, Joshi N, Banerjee R, Quach DT, Aye TT, Chiu H, Lau LHS, Ng SC, Ang TL, Khomvilai S, Li X, Ho S, Sano W, Hattori S, Fujita M, Murakami Y, Shimatani M, Kodama Y, Sano Y. Efficacy of international web-based educational intervention in the detection of high-risk flat and depressed colorectal lesions higher (CATCH project) with a video: Randomized trial. Dig Endosc 2022; 34:1166-1175. [PMID: 35122323 PMCID: PMC9540870 DOI: 10.1111/den.14244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 01/14/2022] [Accepted: 01/23/2022] [Indexed: 02/08/2023]
Abstract
OBJECTIVES Three subcategories of high-risk flat and depressed lesions (FDLs), laterally spreading tumors non-granular type (LST-NG), depressed lesions, and large sessile serrated lesions (SSLs), are highly attributable to post-colonoscopy colorectal cancer (CRC). Efficient and organized educational programs on detecting high-risk FDLs are lacking. We aimed to explore whether a web-based educational intervention with training on FIND clues (fold deformation, intensive stool/mucus attachment, no vessel visibility, and demarcated reddish area) may improve the ability to detect high-risk FDLs. METHODS This was an international web-based randomized control trial that enrolled non-expert endoscopists in 13 Asian countries. The participants were randomized into either education or non-education group. All participants took the pre-test and post-test to read 60 endoscopic images (40 high-risk FDLs, five polypoid, 15 no lesions) and answered whether there was a lesion. Only the education group received a self-education program (video and training questions and answers) between the tests. The primary outcome was a detection rate of high-risk FDLs. RESULTS In total, 284 participants were randomized. After excluding non-responders, the final data analyses were based on 139 participants in the education group and 130 in the non-education group. The detection rate of high-risk FDLs in the education group significantly improved by 14.7% (66.6-81.3%) compared with -0.8% (70.8-70.0%) in the non-education group. Similarly, the detection rate of LST-NG, depressed lesions, and large SSLs significantly increased only in the education group by 12.7%, 12.0%, and 21.6%, respectively. CONCLUSION Short self-education focusing on detecting high-risk FDLs was effective for Asian non-expert endoscopists. (UMIN000042348).
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Affiliation(s)
- Mineo Iwatate
- Gastrointestinal Center and Institute of Minimally‐invasive Endoscopic Care (iMEC)Sano HospitalHyogoJapan
| | - Daizen Hirata
- Gastrointestinal Center and Institute of Minimally‐invasive Endoscopic Care (iMEC)Sano HospitalHyogoJapan
- Department of Gastroenterology and HepatologyKindai UniversityOsakaJapan
| | | | - Jonard Tan Co
- Institute of Digestive and Liver DiseasesSt. Luke’s Medical CenterTaguig CityPhilippines
| | - Jeong‐Sik Byeon
- Department of GastroenterologyAsan Medical CenterUniversity of Ulsan College of MedicineSeoulKorea
| | - Neeraj Joshi
- Gastro Enterology UnitNepal Cancer Hospital and Research CentreLalitpurNepal
| | - Rupa Banerjee
- Medical GastroenterologyAsian Institute of GastroenterologyNew DelhiIndia
| | - Duc Trong Quach
- University of Medicine and Pharmacy at Ho Chi Minh CityHo Chi MinhVietnam
| | | | - Han‐Mo Chiu
- Department of Internal MedicineNational Taiwan University HospitalTaipeiTaiwan
| | - Louis H. S. Lau
- Department of Medicine and TherapeuticsFaculty of MedicineInstitute of Digestive DiseaseThe Chinese University of Hong KongHong KongChina
| | - Siew C. Ng
- Department of Medicine and TherapeuticsFaculty of MedicineInstitute of Digestive DiseaseThe Chinese University of Hong KongHong KongChina
| | - Tiing Leong Ang
- Department of Gastroenterology and HepatologyChangi General HospitalSingHealthSingapore
| | - Supakij Khomvilai
- Surgical EndoscopyColorectal DivisionDepartment of SurgeryFaculty of MedicineChulalongkorn UniversityBangkokThailand
| | - Xiao‐Bo Li
- Division of Gastroenterology and HepatologyKey Laboratory of Gastroenterology and HepatologyMinistry of Health, Renji HospitalSchool of MedicineShanghai Institute of Digestive DiseaseShanghai Jiao Tong UniversityShanghaiChina
| | - Shiaw‐Hooi Ho
- Department of MedicineFaculty of MedicineUniversity of MalayaKuala LumpurMalaysia
| | - Wataru Sano
- Gastrointestinal Center and Institute of Minimally‐invasive Endoscopic Care (iMEC)Sano HospitalHyogoJapan
| | - Santa Hattori
- Gastrointestinal Center and Institute of Minimally‐invasive Endoscopic Care (iMEC)Sano HospitalHyogoJapan
| | - Mikio Fujita
- Gastrointestinal Center and Institute of Minimally‐invasive Endoscopic Care (iMEC)Sano HospitalHyogoJapan
| | | | - Masaaki Shimatani
- The Third Department of Internal MedicineDivision of Gastroenterology and HepatologyKansai Medical University Medical CenterOsakaJapan
| | - Yuzo Kodama
- Division of GastroenterologyDepartment of Internal MedicineKobe University Graduate School of MedicineHyogoJapan
| | - Yasushi Sano
- Gastrointestinal Center and Institute of Minimally‐invasive Endoscopic Care (iMEC)Sano HospitalHyogoJapan
- Kansai Medical UniversityOsakaJapan
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Nemoto D, Guo Z, Peng B, Zhang R, Nakajima Y, Hayashi Y, Yamashina T, Aizawa M, Utano K, Lefor AK, Zhu X, Togashi K. Computer-aided diagnosis of serrated colorectal lesions using non-magnified white-light endoscopic images. Int J Colorectal Dis 2022; 37:1875-1884. [PMID: 35861862 DOI: 10.1007/s00384-022-04210-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 06/23/2022] [Indexed: 02/04/2023]
Abstract
PURPOSE Computer-aided diagnosis systems for polyp characterization are commercially available but cannot recognize subtypes of sessile lesions. This study aimed to develop a computer-aided diagnosis system to characterize polyps using non-magnified white-light endoscopic images. METHODS A total of 2249 non-magnified white-light images from 1030 lesions including 534 tubular adenomas, 225 sessile serrated adenoma/polyps, and 271 hyperplastic polyps in the proximal colon were consecutively extracted from an image library and divided into training and testing datasets (4:1), based on the date of colonoscopy. Using ResNet-50 networks, we developed a classifier (1) to differentiate adenomas from serrated lesions, and another classifier (2) to differentiate sessile serrated adenoma/polyps from hyperplastic polyps. Diagnostic performance was assessed using the testing dataset. The computer-aided diagnosis system generated a probability score for each image, and a probability score for each lesion was calculated as the weighted mean with a log10-transformation. Two experts (E1, E2) read the identical testing dataset with a probability score. RESULTS The area under the curve of classifier (1) for adenomas was equivalent to E1 and superior to E2 (classifier 86%, E1 86%, E2 69%; classifier vs. E2, p < 0.001). In contrast, the area under the curve of classifier (2) for sessile serrated adenoma/polyps was inferior to both experts (classifier 55%, E1 68%, E2 79%; classifier vs. E2, p < 0.001). CONCLUSION The classifier (1) developed using white-light images alone compares favorably with experts in differentiating adenomas from serrated lesions. However, the classifier (2) to identify sessile serrated adenoma/polyps is inferior to experts.
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Affiliation(s)
- Daiki Nemoto
- Department of Coloproctology & Gastroenterology, Aizu Medical Center, Fukushima Medical University, 21-2 Maeda, Tanisawa, Aizuwakamatsu, Fukushima, 969-3492, Japan
| | - Zhe Guo
- Biomedical Information Engineering Lab, The University of Aizu, Aizuwakamatsu, Fukushima, Japan
| | - Boyuan Peng
- Biomedical Information Engineering Lab, The University of Aizu, Aizuwakamatsu, Fukushima, Japan
| | - Ruiyao Zhang
- Biomedical Information Engineering Lab, The University of Aizu, Aizuwakamatsu, Fukushima, Japan
| | - Yuki Nakajima
- Department of Coloproctology & Gastroenterology, Aizu Medical Center, Fukushima Medical University, 21-2 Maeda, Tanisawa, Aizuwakamatsu, Fukushima, 969-3492, Japan
| | - Yoshikazu Hayashi
- Department of Medicine, Division of Gastroenterology, Jichi Medical University, Shimotsuke, Tochigi, Japan
| | - Takeshi Yamashina
- Gastroenterology and Hepatology, Kansai Medical University Medical Center, Moriguchi, Osaka, Japan
| | - Masato Aizawa
- Department of Coloproctology & Gastroenterology, Aizu Medical Center, Fukushima Medical University, 21-2 Maeda, Tanisawa, Aizuwakamatsu, Fukushima, 969-3492, Japan
| | - Kenichi Utano
- Department of Coloproctology & Gastroenterology, Aizu Medical Center, Fukushima Medical University, 21-2 Maeda, Tanisawa, Aizuwakamatsu, Fukushima, 969-3492, Japan
| | - Alan Kawarai Lefor
- Department of Surgery, Jichi Medical University, Shimotsuke, Tochigi, Japan
| | - Xin Zhu
- Biomedical Information Engineering Lab, The University of Aizu, Aizuwakamatsu, Fukushima, Japan
| | - Kazutomo Togashi
- Department of Coloproctology & Gastroenterology, Aizu Medical Center, Fukushima Medical University, 21-2 Maeda, Tanisawa, Aizuwakamatsu, Fukushima, 969-3492, Japan.
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Tribonias G, Theodoropoulou A, Stylianou K, Giotis I, Mpitouli A, Moschovis D, Komeda Y, Manola ME, Paspatis G, Tzouvala M. Irrigating Acetic Acid Solution During Colonoscopy for the Detection of Sessile Serrated Neoplasia: A Randomized Controlled Trial. Dig Dis Sci 2022; 67:282-292. [PMID: 33515378 DOI: 10.1007/s10620-021-06858-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Accepted: 01/18/2021] [Indexed: 12/18/2022]
Abstract
BACKGROUND Misdiagnosed sessile serrated lesions (SSLs) are important precursors for interval colorectal cancers. AIMS We investigated the usage of acetic acid (AA) solution for improving the detection of SSLs in the right colon in a randomized controlled trial. METHODS A tandem observation of the right colon was performed in 412 consecutive patients. A first inspection was performed under white light high-definition endoscopy. In the AA group, a low concentration vinegar solution (AA: 0.005%) irrigated by a water pump in the right colon was compared with a plain solution of normal saline (NS) in the diagnostic yield of SSLs during the second inspection. Secondary outcomes in overall polyp detection were measured. RESULTS Qualitative comparisons showed significant differences in the detection rates of all polyps except adenomas, with remarkable improvement in the demonstration of advanced (> 20 mm), SSLs, and hyperplastic polyps during the second inspection of the right colon using the AA solution. Significant improvement was also noted in the AA group, as far as the mean number of polyps/patient detected, not only in SSLs (AA group: 0.14 vs. NS group: 0.01, P < 0.001), but also in all histological types and all size-categories in the right colon. Small (≤ 9 mm) polyps were detected at a higher rate in the sigmoid colon expanding the effect of the method in the rest of the colon. CONCLUSION AA-assisted colonoscopy led to a significant increase in SSLs detection rate in the right colon in a safe, quick, and effective manner.
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Affiliation(s)
- George Tribonias
- Gastroenterology Department, General Hospital of Nikaia-Piraeus "Agios Panteleimon", Mantouvalou D. 3, 18454, Athens, Greece.
| | - Angeliki Theodoropoulou
- Gastroenterology Department, General Hospital of Heraklion "Venizeleio - Pananeio", Crete, Greece
| | | | - Ioannis Giotis
- Gastroenterology Department, General Hospital of Nikaia-Piraeus "Agios Panteleimon", Mantouvalou D. 3, 18454, Athens, Greece
| | - Afroditi Mpitouli
- Gastroenterology Department, General Hospital of Heraklion "Venizeleio - Pananeio", Crete, Greece
| | - Dimitrios Moschovis
- Gastroenterology Department, General Hospital of Nikaia-Piraeus "Agios Panteleimon", Mantouvalou D. 3, 18454, Athens, Greece
| | - Yoriaki Komeda
- Gastroenterology Department, Kindai University Hospital, Osaka, Japan
| | - Margarita-Eleni Manola
- Gastroenterology Department, General Hospital of Nikaia-Piraeus "Agios Panteleimon", Mantouvalou D. 3, 18454, Athens, Greece
| | - Gregorios Paspatis
- Gastroenterology Department, General Hospital of Heraklion "Venizeleio - Pananeio", Crete, Greece
| | - Maria Tzouvala
- Gastroenterology Department, General Hospital of Nikaia-Piraeus "Agios Panteleimon", Mantouvalou D. 3, 18454, Athens, Greece
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Mizuguchi Y, Tanaka Y, Cho H, Sekiguchi M, Takamaru H, Yamada M, Sakamoto T, Matsuda T, Hashimoto T, Sekine S, Saito Y. Endoscopic features of isolated and traditional serrated adenoma-associated superficially serrated adenomas of the colorectum. Dig Endosc 2022; 34:153-162. [PMID: 33871900 DOI: 10.1111/den.13992] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Accepted: 04/11/2021] [Indexed: 02/08/2023]
Abstract
BACKGROUND AND AIM Superficially serrated adenoma (SuSA) is a recently proposed subtype of colorectal serrated lesions. It is characterized by distinct clinicopathological and molecular features, including mixed serrated and adenomatous histology and frequent genetic alterations involving KRAS and RSPO. This study aimed to characterize the endoscopic features of isolated and traditional serrated adenoma (TSA)-associated SuSAs. METHODS We retrospectively evaluated the endoscopic findings of 25 isolated SuSAs and 21 TSA-associated SuSAs that were histologically and molecularly characterized. RESULTS SuSAs appeared as a sessile polyp or slightly elevated lesion located mostly in the sigmoid colon and rectum (88%). The size was between 3 and 20 mm (median, 6 mm). Most of them exhibited KRAS mutations (96%) and RSPO fusions/overexpression (92%). Endoscopically, many lesions had a whitish color (84%), a distinct border (96%), an irregular border (76%), and a lobulated surface (72%). However, diminutive lesions exhibited overlapping features with hyperplastic polyps. On narrow-band imaging, vessel patterns were invisible or appeared as lacy microvessels in most lesions (80%). Chromoendoscopy invariably showed stellar or elongated/branched stellar pits, indicating a serrated microarchitecture. Most TSA-associated SuSAs typically presented as polyps with a two-tier raised appearance, consisting of whitish lower and reddish higher components corresponding to a SuSA and a TSA, respectively. CONCLUSIONS SuSAs exhibit several characteristic endoscopic features on white-light and image-enhanced endoscopy. Diminutive lesions exhibit endoscopic features overlapping with hyperplastic polyps. Nonetheless, the endoscopic diagnosis of larger and TSA-associated SuSAs may be feasible.
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Affiliation(s)
- Yasuhiko Mizuguchi
- Endoscopy Division, National Cancer Center Hospital, Tokyo, Japan.,Division of Diagnostic Pathology, National Cancer Center Hospital, Tokyo, Japan
| | - Yusaku Tanaka
- Endoscopy Division, National Cancer Center Hospital, Tokyo, Japan.,Division of Gastroenterology, Keiyu Hospital, Kanagawa, Japan
| | - Hourin Cho
- Endoscopy Division, National Cancer Center Hospital, Tokyo, Japan
| | - Masau Sekiguchi
- Endoscopy Division, National Cancer Center Hospital, Tokyo, Japan.,Cancer Screening Center, National Cancer Center Hospital, Tokyo, Japan
| | | | - Masayoshi Yamada
- Endoscopy Division, National Cancer Center Hospital, Tokyo, Japan
| | - Taku Sakamoto
- Endoscopy Division, National Cancer Center Hospital, Tokyo, Japan
| | - Takahisa Matsuda
- Endoscopy Division, National Cancer Center Hospital, Tokyo, Japan.,Cancer Screening Center, National Cancer Center Hospital, Tokyo, Japan
| | - Taiki Hashimoto
- Division of Diagnostic Pathology, National Cancer Center Hospital, Tokyo, Japan
| | - Shigeki Sekine
- Division of Diagnostic Pathology, National Cancer Center Hospital, Tokyo, Japan.,Division of Molecular Pathology, National Cancer Center Research Institute, Tokyo, Japan
| | - Yutaka Saito
- Endoscopy Division, National Cancer Center Hospital, Tokyo, Japan
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10
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Shiu SI, Kashida H, Komeda Y. The prevalence of sessile serrated lesion in the colorectum and its relationship to synchronous colorectal advanced neoplasia: a systemic review and meta-analysis. Eur J Gastroenterol Hepatol 2021; 33:1495-1504. [PMID: 33470706 PMCID: PMC8555953 DOI: 10.1097/meg.0000000000002062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Accepted: 12/18/2020] [Indexed: 12/10/2022]
Abstract
BACKGROUND The aim of this systemic review and meta-analysis was to evaluate the prevalence of sessile serrated lesion (SSL) and its relationship to synchronous colorectal advanced neoplasia. MATERIALS AND METHODS Comprehensive, computerized research was performed on PubMed and published from 1 January 2010 to 6 July 2018 which searched relevant articles without any language limitations. Clinical trials were included in the narrative systemic review if they matched the following inclusion criteria: (1) published as a case-controlled study, cohort study or cross-sectional study; (2) defined objectively for diagnosis of SSL within the studies; (3) addressed the prevalence and characteristics of SSL. Within these trials, if they met additional criteria involving the reported outcome of risk regarding advanced neoplasia in relation to SSL, they were enrolled into meta-analysis. RESULTS Forty-one trials were enrolled for the systematic review, with a total of eight analyzed for the meta-analysis. The prevalence of all SSL ranged from 0.038 to 20.23% and the prevalence by pooled analysis was 2.7%. In a subgroup analysis, the overall prevalence of SSL during the periods of 2010-2014 and 2015-2018 was shown to be 2.7 and 2.8%, respectively. We calculated the pooled data on the cancer risk of SSL and the risk of synchronous advanced neoplasia in patients with SSL made available from the eight trials, which resulted in a pooled odds ratio of 3.53 (95% confidence interval 2.39-5.20, I2 = 4%, P = 0.40). CONCLUSION In this systemic review, SSL was found to be associated with an increased risk of synchronous advanced neoplasia in the colorectum.
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Affiliation(s)
- Sz-Iuan Shiu
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, Taichung Veterans General Hospital
- Department of Critical Care Medicine, Taichung Veterans General Hospital
- Evidence-based Practice and Policymaking Committee, Taichung Veterans General Hospital, Taichung, Taiwan
| | - Hiroshi Kashida
- Department of Gastroenterology and Hepatology, Kindai University, Osakasayama, Japan
| | - Yoriaki Komeda
- Department of Gastroenterology and Hepatology, Kindai University, Osakasayama, Japan
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11
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Toyoshima O, Yoshida S, Nishizawa T, Yamakawa T, Arano T, Isomura Y, Kanazawa T, Ando H, Tsuji Y, Koike K. Simple feedback of colonoscopy performance improved the number of adenomas per colonoscopy and serrated polyp detection rate. Endosc Int Open 2021; 9:E1032-E1038. [PMID: 34222627 PMCID: PMC8211485 DOI: 10.1055/a-1393-5469] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Accepted: 10/26/2020] [Indexed: 02/07/2023] Open
Abstract
Background and study aims High-quality endoscopy requires improvement of not only the adenoma detection rate (ADR) but also the serrated polyp (SP) detection rate and the mean number of adenomas per positive procedure (MAP +). We evaluated whether a simple feedback of colonoscopy performance improves those quality indicators using propensity-score matching. Patients and methods Eleven endoscopists were evaluated regarding colonoscopy performance including ADRs, SP detection rates, mean numbers of adenomas per procedure (MAPs), and MAPs + with their ranking in the clinic. Endoscopic performance was compared before and after the feedback. Results Colonoscopies were performed for 874 patients before the feedback and 1,272 patients after the feedback. Using propensity-score matching, 803 patients before the feedback and 803 patients after the feedback were matched. ADR after the feedback was significantly higher than that before the feedback (50.8 % and 40.8 %, respectively). MAP after feedback was significantly larger than that before the feedback (0.92 and 0.69, respectively), as well as MAP + (1.96 and 1.69, respectively). Clinically significant SP detection rate was also improved from 10.0 % to 14.9 %. Conclusions Feedback including ADR, MAP, MAP +, and clinically significant SR detection rate could improve on those quality indicators. Further studies are needed to effectively prevent colorectal cancer in colonoscopy practice.
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Affiliation(s)
- Osamu Toyoshima
- Gastroenterology, Toyoshima Endoscopy Clinic, Tokyo, Japan,Department of Gastroenterology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Shuntaro Yoshida
- Gastroenterology, Toyoshima Endoscopy Clinic, Tokyo, Japan,Department of Gastroenterology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Toshihiro Nishizawa
- Gastroenterology, Toyoshima Endoscopy Clinic, Tokyo, Japan,Department of Gastroenterology and Hepatology, International University of Health and Welfare, Chiba, Japan
| | | | - Toru Arano
- Gastroenterology, Toyoshima Endoscopy Clinic, Tokyo, Japan,Department of Gastroenterology, The Fraternity Memorial Hospital, Tokyo, Japan
| | - Yoshihiro Isomura
- Gastroenterology, Toyoshima Endoscopy Clinic, Tokyo, Japan,Department of Gastroenterology, Kyoundo Hospital, Tokyo, Japan
| | - Takamitsu Kanazawa
- Gastroenterology, Toyoshima Endoscopy Clinic, Tokyo, Japan,Department of Gastrointestinal Surgery, JR Tokyo General Hospital, Tokyo, Japan
| | | | - Yosuke Tsuji
- Department of Gastroenterology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Kazuhiko Koike
- Department of Gastroenterology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
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12
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Nishizawa T, Yoshida S, Toyoshima A, Yamada T, Sakaguchi Y, Irako T, Ebinuma H, Kanai T, Koike K, Toyoshima O. Endoscopic diagnosis for colorectal sessile serrated lesions. World J Gastroenterol 2021; 27:1321-1329. [PMID: 33833485 PMCID: PMC8015299 DOI: 10.3748/wjg.v27.i13.1321] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/31/2020] [Revised: 01/29/2021] [Accepted: 03/18/2021] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Hyperplastic polyps are considered non-neoplastic, whereas sessile serrated lesions (SSLs) are precursors of cancer via the ‘‘serrated neoplastic pathway’’. The clinical features of SSLs are tumor size (> 5 mm), location in the proximal colon, coverage with abundant mucus called the ‘‘mucus cap’’, indistinct borders, and a cloud-like surface. The features in magnifying narrow-band imaging are varicose microvascular vessels and expanded crypt openings. However, accurate diagnosis is often difficult.
AIM To develop a diagnostic score system for SSLs.
METHODS We retrospectively reviewed consecutive patients who underwent endoscopic resection during colonoscopy at the Toyoshima endoscopy clinic. We collected data on serrated polyps diagnosed by endoscopic or pathological examination. The significant factors for the diagnosis of SSLs were assessed using logistic regression analysis. Each item that was significant in multivariate analysis was assigned 1 point, with the sum of these points defined as the endoscopic SSL diagnosis score. The optimal cut-off value of the endoscopic SSL diagnosis score was determined by receiver-operating characteristic curve analysis.
RESULTS Among 1288 polyps that were endoscopically removed, we analyzed 232 diagnosed as serrated polyps by endoscopic or pathological examination. In the univariate analysis, the location (proximal colon), size (> 5 mm), mucus cap, indistinct borders, cloud-like surface, and varicose microvascular vessels were significantly associated with the diagnosis of SSLs. In the multivariate analysis, size (> 5 mm; P = 0.033), mucus cap (P = 0.005), and indistinct borders (P = 0.033) were independently associated with the diagnosis of SSLs. Size > 5 mm, mucus cap, and indistinct borders were assigned 1 point each and the sum of these points was defined as the endoscopic SSL diagnosis score. The receiver-operating characteristic curve analysis showed an optimal cut-off score of 3, which predicted pathological SSLs with 75% sensitivity, 80% specificity, and 78.4% accuracy. The pathological SSL rate for an endoscopic SSL diagnosis score of 3 was significantly higher than that for an endoscopic SSL diagnosis score of 0, 1, or 2 (P < 0.001).
CONCLUSION Size > 5 mm, mucus cap, and indistinct borders were significant endoscopic features for the diagnosis of SSLs. Serrated polyps with these three features should be removed during colonoscopy.
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Affiliation(s)
- Toshihiro Nishizawa
- Department of Gastroenterology and Hepatology, International University of Health and Welfare Narita Hospital, Narita 2868520, Japan
| | - Shuntaro Yoshida
- Department of Gastroenterology, Toyoshima Endoscopy Clinic, Tokyo 1570066, Japan
| | - Akira Toyoshima
- Department of Colorectal Surgery, Japanese Red Cross Medical Center, Tokyo 1508935, Japan
| | - Tomoharu Yamada
- Department of Gastroenterology, The University of Tokyo, Tokyo 1138655, Japan
| | - Yoshiki Sakaguchi
- Department of Gastroenterology, Graduate School of Medicine, The University of Tokyo, Tokyo 1138655, Japan
| | - Taiga Irako
- Department of Internal Medicine, Irako Clinic, Tokyo 1560052, Japan
| | - Hirotoshi Ebinuma
- Department of Gastroenterology and Hepatology, International University of Health and Welfare Narita Hospital, Narita 2868520, Japan
| | - Takanori Kanai
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, Keio University School of Medicine, Shinjuku-ku 1608582, Tokyo, Japan
| | - Kazuhiko Koike
- Department of Gastroenterology, Graduate School of Medicine, The University of Tokyo, Tokyo 1138655, Japan
| | - Osamu Toyoshima
- Department of Gastroenterology, Toyoshima Endoscopy Clinic, Tokyo 1570066, Japan
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13
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Ibáñez-Sanz G, Sanz-Pamplona R, Garcia M. Future Prospects of Colorectal Cancer Screening: Characterizing Interval Cancers. Cancers (Basel) 2021; 13:1328. [PMID: 33809520 PMCID: PMC8001713 DOI: 10.3390/cancers13061328] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Revised: 03/06/2021] [Accepted: 03/13/2021] [Indexed: 12/11/2022] Open
Abstract
Tumors that are not detected by screening tests are known as interval cancers and are diagnosed clinically after a negative result in the screening episode but before the next screening invitation. Clinical characteristics associated with interval colorectal cancers have been studied, but few molecular data are available that describe interval colorectal cancers. A better understanding of the clinical and biological characteristics associated with interval colorectal cancer may provide new insights into how to prevent this disease more effectively. This review aimed to summarize the current literature concerning interval colorectal cancer and its epidemiological, clinical, and molecular features.
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Affiliation(s)
- Gemma Ibáñez-Sanz
- Oncology Data Analytics Programme, Catalan Institute of Oncology, Hospitalet de Llobregat, 08907 Barcelona, Spain;
- Gastroenterology Department, Bellvitge University Hospital, Hospitalet de Llobregat, 08907 Barcelona, Spain
- Colorectal Cancer Research Group, ONCOBELL Programme, Institut d’Investigació Biomèdica de Bellvitge (IDIBELL), Hospitalet de Llobregat, 08907 Barcelona, Spain
- CIBER Epidemiology and Public Health (CIBERESP), 28029 Madrid, Spain
| | - Rebeca Sanz-Pamplona
- Oncology Data Analytics Programme, Catalan Institute of Oncology, Hospitalet de Llobregat, 08907 Barcelona, Spain;
- Colorectal Cancer Research Group, ONCOBELL Programme, Institut d’Investigació Biomèdica de Bellvitge (IDIBELL), Hospitalet de Llobregat, 08907 Barcelona, Spain
- CIBER Epidemiology and Public Health (CIBERESP), 28029 Madrid, Spain
| | - Montse Garcia
- CIBER Epidemiology and Public Health (CIBERESP), 28029 Madrid, Spain
- Cancer Screening Unit, Prevention and Control Programme, Catalan Institute of Oncology, Hospitalet de Llobregat, 08907 Barcelona, Spain
- Early Detection of Cancer Research Group, EPIBELL Programme, Institut d’Investigació Biomèdica de Bellvitge (IDIBELL), Hospitalet de Llobregat, 08907 Barcelona, Spain
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14
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Murakami T, Nagahara A, Yao T. Rare case of colorectal traditional serrated adenoma mimicking a subepithelial lesion. Dig Endosc 2021; 33:208. [PMID: 33058274 DOI: 10.1111/den.13872] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Revised: 10/05/2020] [Indexed: 02/08/2023]
Affiliation(s)
- Takashi Murakami
- Departments of Gastroenterology, Department of, Juntendo University School of Medicine, Tokyo, Japan
| | - Akihito Nagahara
- Departments of Gastroenterology, Department of, Juntendo University School of Medicine, Tokyo, Japan
| | - Takashi Yao
- Department of, Human Pathology, Juntendo University School of Medicine, Tokyo, Japan
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15
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Toyoshima O, Nishizawa T, Yoshida S, Sekiba K, Kataoka Y, Hata K, Watanabe H, Tsuji Y, Koike K. Expert endoscopists with high adenoma detection rates frequently detect diminutive adenomas in proximal colon. Endosc Int Open 2020; 8:E775-E782. [PMID: 32490163 PMCID: PMC7247898 DOI: 10.1055/a-1136-9971] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/30/2019] [Accepted: 03/02/2020] [Indexed: 02/07/2023] Open
Abstract
Background and study aims Adenoma detection rate (ADR) is an important quality indicator in colonoscopy, and improved ADR decreases the incidence of colorectal cancer. We investigated differences in polyp detection according to the endoscopist's ADR. Patients and methods We performed a propensity-score matching study using baseline patient characteristics of age, sex, body mass index, family history of colorectal cancer, smoking, drinking, indication for colonoscopy, bowel preparation, and colonoscope type. We compared polyp detection and colonoscopy procedures between patients who underwent colonoscopy by high-ADR endoscopists (high ADR group) and by low-ADR endoscopists (low ADR group). Results We matched 334 patients in the high ADR group with 334 in the low ADR group. The ADR was 44.0 % and 26.9 % for the high-ADR and low-ADR endoscopists, respectively. Proximal, nonprotruding, and diminutive adenomas were more frequently detected by high-ADR endoscopists than by low-ADR endoscopists (all P < 0.001); similarly, more high-risk adenomas were detected by high-ADR endoscopists ( P = 0.028). Furthermore, more sessile serrated polyps detected by high-ADR endoscopists ( P = 0.041). High-ADR endoscopists more frequently performed pancolonic chromoendoscopy ( P < 0.001). Conclusions Expert detectors often found nonprotruding and diminutive adenomas in the proximal colon along with increased detection rate of high-risk adenomas. Low-ADR endoscopists need to recognize the features of missed adenomas to improve their ADRs.
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Affiliation(s)
- Osamu Toyoshima
- Gastroenterology, Toyoshima Endoscopy Clinic, Tokyo, Japan,Department of Gastroenterology, Graduate School of Medicine, The University of Tokyo, Tokoyo, Japan
| | - Toshihiro Nishizawa
- Gastroenterology, Toyoshima Endoscopy Clinic, Tokyo, Japan,Department of Gastroenterology and Hepatology, International University of Health and Welfare, Mita Hospital, Tokyo, Japan
| | - Shuntaro Yoshida
- Gastroenterology, Toyoshima Endoscopy Clinic, Tokyo, Japan,Department of Gastroenterology, Graduate School of Medicine, The University of Tokyo, Tokoyo, Japan
| | - Kazuma Sekiba
- Gastroenterology, Toyoshima Endoscopy Clinic, Tokyo, Japan,Department of Gastroenterology, Graduate School of Medicine, The University of Tokyo, Tokoyo, Japan
| | - Yosuke Kataoka
- Gastroenterology, Toyoshima Endoscopy Clinic, Tokyo, Japan,Department of Gastroenterology, Sanraku Hospital, Chiyoda-ku, Japan
| | - Keisuke Hata
- Gastroenterology, Toyoshima Endoscopy Clinic, Tokyo, Japan,Department of Surgical Oncology, Graduate School of Medicine, The University of Tokyo, Japan
| | | | - Yosuke Tsuji
- Department of Gastroenterology, Graduate School of Medicine, The University of Tokyo, Tokoyo, Japan
| | - Kazuhiko Koike
- Department of Gastroenterology, Graduate School of Medicine, The University of Tokyo, Tokoyo, Japan
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