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Colorectal dysplasia

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https://www.readbyqxmd.com/read/28927130/stereomicroscopic-features-of-colitis-associated-tumors-in-mice-evaluation-of-pit-pattern
#1
Ryosuke Yamauchi, Ken Kominato, Keiichi Mitsuyama, Hidetoshi Takedatsu, Shinichiro Yoshioka, Kotaro Kuwaki, Hiroshi Yamasaki, Shuhei Fukunaga, Atsushi Mori, Jun Akiba, Osamu Tsuruta, Takuji Torimura
Patients with longstanding ulcerative colitis have an increased risk of colorectal cancer. Mouse models for colitis-associated tumors are indispensable for the development of novel strategies for prevention and intervention, as well as an improved understanding of the mechanisms underlying tumor formation. The present study examined whether stereomicroscopic observations with dye-application were able to detect and discriminate tumors in a colitis-associated tumor model in mice. Colonic tumors were induced in C57BL/6 mice by 15 cycles of treatment with dextran sulfate sodium (DSS) in drinking water...
September 2017: Oncology Letters
https://www.readbyqxmd.com/read/28922695/strategies-for-detecting-colon-cancer-in-patients-with-inflammatory-bowel-disease
#2
REVIEW
William A Bye, Tran M Nguyen, Claire E Parker, Vipul Jairath, James E East
BACKGROUND: Patients with longstanding ulcerative colitis and colonic Crohn's disease have an increased risk of colorectal cancer (CRC) compared with the general population. This review assessed the evidence that endoscopic surveillance may prolong life by allowing earlier detection of CRC or its pre-cursor lesion, dysplasia, in patients with inflammatory bowel disease (IBD). OBJECTIVES: To assess the effectiveness of cancer surveillance programs for diagnosis of IBD-associated colorectal cancer and in reducing the mortality rate from colorectal cancer in patients with IBD...
September 18, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28919998/reciprocal-influence-of-b-cells-and-tumor-macro-and-microenvironments-in-the-apc-min-model-of-colorectal-cancer
#3
Francesca Mion, Stefania Vetrano, Silvia Tonon, Viviana Valeri, Andrea Piontini, Alessia Burocchi, Luciana Petti, Barbara Frossi, Alessandro Gulino, Claudio Tripodo, Mario P Colombo, Carlo E Pucillo
One of the most fascinating aspects of the immune system is its dynamism, meant as the ability to change and readapt according to the organism needs. Following an insult, we assist to the spontaneous organization of different immune cells which cooperate, locally and at distance, to build up an appropriate response. Throughout tumor progression, adaptations within the systemic tumor environment, or macroenvironment, result in the promotion of tumor growth, tumor invasion and metastasis to distal organs, but also to dramatic changes in the activity and composition of the immune system...
2017: Oncoimmunology
https://www.readbyqxmd.com/read/28884228/expression-of-atf6-as-a-marker-of-pre-cancerous-atypical-change-in-ulcerative-colitis-associated-colorectal-cancer-a-potential-role-in-the-management-of-dysplasia
#4
Marie Hanaoka, Toshiaki Ishikawa, Megumi Ishiguro, Michiyo Tokura, Shinichi Yamauchi, Akifumi Kikuchi, Hiroyuki Uetake, Masamichi Yasuno, Tatsuyuki Kawano
BACKGROUND: Diagnosis of low-grade dysplasia (LGD) is important in the management of ulcerative colitis (UC), but it is often difficult to distinguish LGD from inflammatory regenerative epithelium. The unfolded protein response (UPR) is activated in inflammatory bowel disease and malignancies. We aimed to identify a UPR-related gene that is involved in the development of non-UC and UC-associated colorectal cancer (CRC), and to investigate whether the target gene is useful for the diagnosis of LGD...
September 7, 2017: Journal of Gastroenterology
https://www.readbyqxmd.com/read/28882578/managing-ulcerative-colitis-patients-with-endoscopically-invisible-low-grade-dysplasia
#5
Ben Parker, James Buchanan, Sarah Wordsworth, Satish Keshav, Bruce George, James E East
BACKGROUND AND AIMS: There is uncertainty regarding the optimal management of endoscopically invisible ("flat") low grade dysplasia in ulcerative colitis. Such a finding does not currently provide an automatic indication for colectomy; however, a recommendation of surveillance instead of surgery is controversial. The aim of this study was to determine the clinical and cost-effectiveness of colonoscopic surveillance versus colectomy for endoscopically invisible low-grade dysplasia of the colon in ulcerative colitis...
September 4, 2017: Gastrointestinal Endoscopy
https://www.readbyqxmd.com/read/28874956/use-and-barriers-to-chromoendoscopy-for-dysplasia-surveillance-in-inflammatory-bowel-disease
#6
REVIEW
Richa Shukla, Mark Salem, Jason K Hou
Traditionally, patients with inflammatory bowel disease (IBD) have been thought to be at increased risk of developing colitis-associated colorectal cancer. Although there are recent data suggesting that rates of colitis-associated cancer in IBD patients is declining, current guidelines still recommend regular dysplasia surveillance for early detection and prevention of neoplasia in patients with IBD. White-light endoscopy with random biopsies has been the traditional approach for dysplasia detection; however, newer technologies and approaches have emerged...
August 16, 2017: World Journal of Gastrointestinal Endoscopy
https://www.readbyqxmd.com/read/28855108/squamoid-morules-in-the-pseudoinvasive-foci-of-colonic-polyp-morphologically-mimic-invasive-carcinoma
#7
Hee Eun Lee, Vishal S Chandan, Chung-Ta Lee, Tsung-Teh Wu
Colorectal adenomas can show focal squamous differentiation or squamoid morules. We describe histologic findings of squamoid morules in the pseudoinvasive foci of colorectal polyps mimicking invasive carcinoma. Five colonic polyps with squamoid morules in the pseudoinvasive foci were collected. Histologic review and immunostains for cytokeratin (CK) 5/6, p63, synaptophysin, and chromogranin were performed on cases with squamoid morules. Forty-seven consecutive colorectal polyps with pseudoinvasion, none of which showed squamoid morules by histology review, and their clinicopathologic features were compared with the cases containing squamoid morules...
August 27, 2017: Human Pathology
https://www.readbyqxmd.com/read/28843957/association-of-aneuploidy-and-flat-dysplasia-with-development-of-high-grade-dysplasia-or-colorectal-cancer-in-patients-with-inflammatory-bowel-disease
#8
Jia-Huei Tsai, Peter S Rabinovitch, Danning Huang, Thomas Small, Aras N Mattis, Sanjay Kakar, Won-Tak Choi
There is controversy over how to best manage patients with inflammatory bowel disease (IBD) and flat low-grade dysplasia (fLGD) in the colon. We performed a retrospective analysis of formalin-fixed paraffin-embedded colon tissues with fLGD from 37 patients undergoing surveillance colonoscopy for IBD, from 1990 to 2015 at the University of California at San Francisco Medical Center, to determine whether detection of aneuploidy is associated with later development of high-grade dysplasia (HGD) or colorectal cancer (CRC)...
August 23, 2017: Gastroenterology
https://www.readbyqxmd.com/read/28843232/colorectal-cancer-and-precancerous-lesions-associated-with-ulcerative-colitis-in-thailand
#9
Peranart Chotivitayatarakorn, Ratha-Korn Vilaichone
Background: Ulcerative colitis(UC) is important risk factor of colorectal cancer. Many evidences from western countries confirmed this relationship but limited studies were reported in ASEAN. This study was aimed to investigate prevalence, clinical presentations, endoscopic findings, histopathology, disease progression and risk for colorectal cancer(CRC) of UC patients in Thailand. Methods: We conducted a retrospective cohort study using computer data base from Thammasat University Hospital, Pathumthani, Thailand between September 2011 and December 2015, follow-up through May 2016...
August 27, 2017: Asian Pacific Journal of Cancer Prevention: APJCP
https://www.readbyqxmd.com/read/28839872/advanced-imaging-in-colonoscopy-contemporary-approach-to-dysplasia-surveillance-in-inflammatory-bowel-disease
#10
Iosif Beintaris, Matt Rutter
Inflammatory bowel disease (IBD) (ulcerative colitis (UC) and Crohn's disease (CD)) is a chronic relapsing/remitting condition characterised by intestinal inflammation. One of the main concerns in patients with longstanding ulcerative and Crohn's colitis is development of colonic dysplasia and colorectal cancer (CRC), a risk higher than that of the general population. Colonoscopy surveillance programmes have been developed by major societies worldwide to improve early dysplasia detection and treatment, thus preventing progression to colorectal cancer...
October 2016: Frontline Gastroenterology
https://www.readbyqxmd.com/read/28836702/results-of-a-36-year-surveillance-program-for-ulcerative-colitis-associated-neoplasia-in-the-japanese-population
#11
Junko Kishikawa, Hata Keisuke, Shinsuke Kazama, Hiroyuki Anzai, Takahide Shinagawa, Koji Murono, Manabu Kaneko, Kazuhito Sasaki, Koji Yasuda, Kensuke Otani, Takeshi Nishikawa, Toshiaki Tanaka, Tomomichi Kiyomatsu, Kazushige Kawai, Hiroaki Nozawa, Soichiro Ishihara, Teppei Morikawa, Masashi Fukayama, Toshiaki Watanabe
BACKGROUND: Surveillance colonoscopy has been performed for patients with long-standing ulcerative colitis, who have an increased risk for colorectal cancer. The aim of this study was to determine the incidence of and the risk factors for neoplasia. METHODS: We evaluated 289 ulcerative colitis patients who underwent surveillance colonoscopy between January1979 and December 2014. The cumulative incidence of neoplasia and its risk factors were investigated. The clinical stage and overall survival were compared between the surveillance and non-surveillance groups...
August 24, 2017: Digestive Endoscopy: Official Journal of the Japan Gastroenterological Endoscopy Society
https://www.readbyqxmd.com/read/28818507/optimizing-quality-of-endoscopy-in-inflammatory-bowel-disease-focus-on-surveillance-and-management-of-colorectal-dysplasia-using-interactive-image-and-video-based-teaching
#12
Tonya R Kaltenbach, Roy M Soetikno, Rebecca DeVivo, Loren A Laine, Alan Barkun, Kenneth R McQuaid
BACKGROUND & AIMS: Varying recommendations regarding the detection and management of dysplasia can lead to uncertainty and may have impeded the uptake of strategies that could improve surveillance in patients with inflammatory bowel disease (IBD). As such, an educational event was held to assist in disseminating the recently published Surveillance for Colorectal Endoscopic Neoplasia Detection and Management in Inflammatory Bowel Disease Patients: International Consensus Recommendations (SCENIC)...
August 14, 2017: Gastrointestinal Endoscopy
https://www.readbyqxmd.com/read/28803403/endoscopic-surveillance-in-long-standing-colitis
#13
REVIEW
Brigid S Boland, Amandeep Shergill, Tonya Kaltenbach
There is a relative increase in the risk of colon cancer in patients with inflammatory bowel disease (IBD) affecting the colon, and endoscopic surveillance is advocated to mitigate this risk. The current standard practice is to survey this high-risk patient population using colonoscopy. Chromoendoscopy with targeted biopsies has emerged as the colonoscopy modality recommended by the major societies to optimize dysplasia detection. Studies over the past year support the improved yield from targeted as compared to random biopsies and improved dysplasia detection from chromoendoscopy as compared to white light endoscopy...
August 12, 2017: Current Treatment Options in Gastroenterology
https://www.readbyqxmd.com/read/28790093/aggressive-large-cell-neuroendocrine-carcinoma-of-the-sigmoid-colon-in-a-patient-with-ulcerative-colitis
#14
Patrick Stoner, Taban Ghaffaripour, David Cohen
Colonic inflammation seen in inflammatory bowel disease (IBD) predisposes to the development of colorectal adenocarcinoma. In contrast, colorectal neuroendocrine carcinomas (NECs) have rarely been reported in the setting of IBD, and no definitive relationship between these tumours and IBD has been established. Dysplasia from chronic inflammation leading to neuroendocrine cell differentiation may be responsible for NEC development, though this finding has not been seen consistently. We present a case of large-cell neuroendocrine carcinoma of the sigmoid colon in a 65-year-old woman with long-standing ulcerative colitis...
August 7, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28780076/bmi1-and-mel18-promote-colitis-associated-cancer-in-mice-via-reg3b-and-stat3
#15
Xicheng Liu, Wendi Wei, Xiaowei Li, Pengcheng Shen, Dapeng Ju, Zhen Wang, Rukui Zhang, Fu Yang, Chunyan Chen, Kun Cao, Guoli Zhu, Hongyan Chen, Liang Chen, Jianhua Sui, Erquan Zhang, Kaichun Wu, Fengchao Wang, Liping Zhao, Rongwen Xi
BACKGROUND & AIMS: Polycomb group proteins are epigenetic factors that silence gene expression; they are dysregulated in cancer cells and contribute to carcinogenesis by unclear mechanisms. We investigated whether BMI1 proto-oncogene, polycomb ring finger (BMI1) and polycomb group ring finger 2 (PCGF2, also called MEL18) are involved in initiation and progression of colitis-associated cancer (CAC) in mice. METHODS: We generated mice containing floxed alleles of Bmi1 and/or Mel18 and/or Reg3b using the villin-Cre promoter (called Bmi1(ΔIEC), Mel18(ΔIEC), DKO, and TKO mice)...
August 2, 2017: Gastroenterology
https://www.readbyqxmd.com/read/28767463/can-the-sum-of-adenoma-diameters-adenoma-bulk-on-index-examination-predict-risk-of-metachronous-advanced-neoplasia
#16
Joseph C Anderson, Carolyn B Morris, Douglas J Robertson, Elizabeth L R Barry, Jane C Figueiredo, Marcia Cruz-Correa, Roberd M Bostick, Dennis J Ahnen, John A Baron
BACKGROUND: Recent data suggest that adenoma size and number are more important predictors of metachronous colorectal neoplasia than advanced histology. Furthermore, there is poor reproducibility in diagnosing advanced histology; high-grade dysplasia and villous histology. Therefore we developed a new metric, adenoma bulk, the sum of diameters of all baseline adenomas, regardless of advanced features. GOAL: Compare the predictive value for metachronous advanced neoplasia of adenoma bulk to conventional paradigm...
August 1, 2017: Journal of Clinical Gastroenterology
https://www.readbyqxmd.com/read/28764791/metachronous-colorectal-carcinoma-with-massive-submucosal-invasion-detected-by-annual-surveillance-in-a-lynch-syndrome-patient-a-case-report
#17
Masashi Utsumi, Kohji Tanakaya, Yutaka Mushiake, Tomoyoshi Kunitomo, Isao Yasuhara, Fumitaka Taniguchi, Takashi Arata, Koh Katsuda, Hideki Aoki, Hitoshi Takeuchi
BACKGROUND: Lynch syndrome is the most common form of hereditary colorectal carcinoma. It is characterized by the presence of germline mutations in DNA mismatch repair genes. Mutation carriers have a lifetime risk of developing colorectal carcinoma of approximately 80%. Current treatment guidelines recommend periodic surveillance for colorectal carcinoma in patients with Lynch syndrome. However, the optimal interval between colonoscopies has not yet been determined. CASE PRESENTATION: We describe a 54-year-old man with Lynch syndrome who was undergoing annual colonoscopy surveillance for the development of colorectal carcinoma...
August 1, 2017: World Journal of Surgical Oncology
https://www.readbyqxmd.com/read/28752838/sessile-serrated-adenomas-with-dysplasia-morphological-patterns-and-correlations-with-mlh1-immunohistochemistry
#18
Cheng Liu, Neal I Walker, Barbara A Leggett, Vicki Lj Whitehall, Mark L Bettington, Christophe Rosty
Sessile serrated adenomas are the precursor polyp of approximately 20% of colorectal carcinomas. Sessile serrated adenomas with dysplasia are rarely encountered and represent an intermediate step to malignant progression, frequently associated with loss of MLH1 expression. Accurate diagnosis of these lesions is important to facilitate appropriate surveillance, particularly because progression from dysplasia to carcinoma can be rapid. The current World Health Organization classification describes two main patterns of dysplasia occurring in sessile serrated adenomas, namely, serrated and conventional...
July 28, 2017: Modern Pathology: An Official Journal of the United States and Canadian Academy of Pathology, Inc
https://www.readbyqxmd.com/read/28751521/the-third-pathway-of-colorectal-carcinogenesis
#19
REVIEW
Carlos A Rubio, Giacomo Puppa, Giovanni de Petris, Lorand Kis, Peter T Schmidt
AIMS: The majority of the colorectal carcinomas (CRC) arise in a vast mucosal area built with columnar cells and mucus-producing goblet cells. These carcinomas evolve via the conventional (tubular/villous) adenoma-carcinoma pathway, or the serrated adenoma-carcinoma pathway. Much less frequently CRC arise in the gut-associated lymphoid tissue (GALT) mucosal domain via the third pathway of colorectal carcinogenesis. METHODS: All publications on human colorectal GALT carcinomas in the literature were reviewed...
July 27, 2017: Journal of Clinical Pathology
https://www.readbyqxmd.com/read/28729694/paracrine-cyclooxygenase-2-activity-by-macrophages-drives-colorectal-adenoma-progression-in-the-apc-min-mouse-model-of-intestinal-tumorigenesis
#20
Mark A Hull, Richard J Cuthbert, C W Stanley Ko, Daniel J Scott, Elizabeth J Cartwright, Gillian Hawcroft, Sarah L Perry, Nicola Ingram, Ian M Carr, Alexander F Markham, Constanze Bonifer, P Louise Coletta
Genetic deletion or pharmacological inhibition of cyclooxygenase (COX)-2 abrogates intestinal adenoma development at early stages of colorectal carcinogenesis. COX-2 is localised to stromal cells (predominantly macrophages) in human and mouse intestinal adenomas. Therefore, we tested the hypothesis that paracrine Cox-2-mediated signalling from macrophages drives adenoma growth and progression in vivo in the Apc (Min/+) mouse model of intestinal tumorigenesis. Using a transgenic C57Bl/6 mouse model of Cox-2 over-expression driven by the chicken lysozyme locus (cLys-Cox-2), which directs integration site-independent, copy number-dependent transgene expression restricted to macrophages, we demonstrated that stromal macrophage Cox-2 in colorectal (but not small intestinal) adenomas from cLys-Cox-2 x Apc (Min/+) mice was associated with significantly increased tumour size (P = 0...
July 20, 2017: Scientific Reports
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