Daniel Azuara1, Susanna Aussó2, Francisco Rodriguez-Moranta3, Jordi Guardiola3, Xavier Sanjuan4, Triana Lobaton5, Jaume Boadas6, Marta Piqueras6, David Monfort6, Elisabet Guinó2, Victor Moreno2, Gabriel Capellá1, Javier de Oca7. 1. Translational Research Laboratory, Catalan Insitute of Oncology (ICO), Bellvitge Biomedical Research Institute (IDIBELL)-CIBERONC, L'Hospitalet de Llobregat, Barcelona, Spain. 2. Unit of Biomarkers and Susceptibility, Cancer Prevention and Control Program, ICO-IDIBELL and CIBERESP, L'Hospitalet de Llobregat, Barcelona, Spain. 3. Department of Gastroenterology, University Hospital Bellvitge (HUB-IDIBELL), L'Hospitalet de Llobregat, Barcelona, Spain. 4. Department of Pathology, University Hospital Bellvitge (HUB-IDIBELL), L'Hospitalet de Llobregat, Barcelona, Spain. 5. Department of Gastroenterology, Germans Trias i Pujol University Hospital, Badalona, Barcelona, Spain. 6. Department of Gastroenterology, Hospital of Terrassa, Terrassa Health Consortium (CST), Terrassa, Barcelona, Spain. 7. Department of General and Digestive Surgery, Colorectal Unit, University Hospital Bellvitge (HUB-IDIBELL)-CIBERONC, L'Hospitalet de Llobregat, Barcelona, Spain.
Abstract
Background: The risk of developing colorectal cancer (CRC) is increased in patients with inflammatory bowel disease (IBD) of the colon. The aim of the study was to evaluate the effectiveness of selected methylation gene panel for the early detection of CRC in high-risk IBD patients. Methods: In a discovery phase, 73 biopsies of 48 IBD patients (associated or not to CRC) were analyzed from genome-wide DNA methylation analysis using the Illumina Human Methylation 450K BeadChip. The panel of 5 genes selected (EYA4, SLIT2, FLI1, USP44, and SND1) was validated prospectively using methylation-specific melting curve analysis in biopsies of diseased and adjacent healthy tissue of 203 patients: 38 with IBD and associated neoplasia, 81 patients with IBD (25 of them with high risk), 48 with sporadic CRC, and 36 healthy controls. Results: The prevalence of methylation was higher in patients with IBD and associated neoplasia (both in diseased and adjacent healthy tissue, 71% and 52%, respectively) than in healthy controls (2/36, 6%; P = 6.72E-05). Methylation in IBD patients at high risk of dysplasia or cancer was more frequently detected than in patients at low risk (92% vs 57%; odds ratio, 8.63; P = 0.001). EYA4 and SLIT2 were the markers most frequently methylated. Differences in methylation levels were more evident in healthy mucosa (82% vs 15% high vs low risk, respectively; P = 1.25E-05). Conclusions: Analysis of this panel of methylation markers may help in the early identification of colorectal dysplasia or cancer in high-risk IBD patients.
Background: The risk of developing colorectal cancer (CRC) is increased in patients with inflammatory bowel disease (IBD) of the colon. The aim of the study was to evaluate the effectiveness of selected methylation gene panel for the early detection of CRC in high-risk IBDpatients. Methods: In a discovery phase, 73 biopsies of 48 IBDpatients (associated or not to CRC) were analyzed from genome-wide DNA methylation analysis using the Illumina Human Methylation 450K BeadChip. The panel of 5 genes selected (EYA4, SLIT2, FLI1, USP44, and SND1) was validated prospectively using methylation-specific melting curve analysis in biopsies of diseased and adjacent healthy tissue of 203 patients: 38 with IBD and associated neoplasia, 81 patients with IBD (25 of them with high risk), 48 with sporadic CRC, and 36 healthy controls. Results: The prevalence of methylation was higher in patients with IBD and associated neoplasia (both in diseased and adjacent healthy tissue, 71% and 52%, respectively) than in healthy controls (2/36, 6%; P = 6.72E-05). Methylation in IBDpatients at high risk of dysplasia or cancer was more frequently detected than in patients at low risk (92% vs 57%; odds ratio, 8.63; P = 0.001). EYA4 and SLIT2 were the markers most frequently methylated. Differences in methylation levels were more evident in healthy mucosa (82% vs 15% high vs low risk, respectively; P = 1.25E-05). Conclusions: Analysis of this panel of methylation markers may help in the early identification of colorectal dysplasia or cancer in high-risk IBDpatients.
Authors: Michael Scherer; Petr V Nazarov; Reka Toth; Shashwat Sahay; Tony Kaoma; Valentin Maurer; Nikita Vedeneev; Christoph Plass; Thomas Lengauer; Jörn Walter; Pavlo Lutsik Journal: Nat Protoc Date: 2020-09-25 Impact factor: 13.491