Dina Sabry1, Rasha Ahmed2, Sayed Abdalla3, Wael Fathy4, Ahmed Eldemery5, Azza Elamir6. 1. Medical Biochemistry and Molecular Biology Department, Faculty of Medicine, Cairo University, Giza, Egypt. dinasabry@kasralainy.edu.eg. 2. Endemic Medicine & Hepatology Department, Faculty of Medicine, Cairo University, Giza, Egypt. 3. Internal Medicine Department, Faculty of Medicine, Cairo University, Giza, Egypt. 4. Medical Biochemistry and Molecular Biology Department, Faculty of Medicine, Cairo University, Giza, Egypt. 5. Medical Biochemistry Department, Faculty of Medicine, October 6 University, Giza, Egypt. 6. Medical Biochemistry Department, Faculty of Medicine, El Fayoum University, Al Fayoum, Egypt.
Abstract
UNLABELLED: We aimed to study MLH1 and MGMT methylation status in Helicobacter pylori-associated chronic gastritis in Egyptian patients with and without gastric cancer. 39 patients were included in our study. They were divided into 2 groups; patients without (group I) and with gastric adenocarcinoma (group II). Patients were subjected to clinical examination, abdominal ultrasound and upper endoscopy for gastric biopsy. Biopsies were subjected to urease test, histological examination, and DNA purification. H. pylori, Braf, Kras, MLH1 and MGMT methylation were assessed by quantitative PCR. DNA sequencing was performed to assess Braf and Kras genes mutation. qPCR of H. pylori was significantly higher in patients with adenocarcinoma (group II) than those without adenocarcinoma (group I); with a p < 0.001 as well as in patients with age above 50 years with a p value = 0.008. By applying logistic regression analysis it was reported that the H. pylori qPCR is a significant predictor to the adenocarcinoma with OR = 1.025 (95 % CI: 1. 002-1.048), with sensitivity of 90 % and specificity of 100 %. Adenocarcinoma patients had a significantly higher mean age and levels of H. Pylori, Braf, K-ras, methylated MGMT and methylated MLH1 than those of gastritis patients. DNA sequence analysis of Braf (codon 12) and Kras (codon 600) had genes mutation in gastric adenocarcinoma versus chronic gastritis. CONCLUSION: H. pylori may cause epigenetic changes predisposing the patients to cancer stomach. Estimation of H. pylori by qPCR can be a good predictor to adenocarcinoma. Braf and Kras genes mutation were reveled in gastritis and adenocarcinoma patients.
UNLABELLED: We aimed to study MLH1 and MGMT methylation status in Helicobacter pylori-associated chronic gastritis in Egyptian patients with and without gastric cancer. 39 patients were included in our study. They were divided into 2 groups; patients without (group I) and with gastric adenocarcinoma (group II). Patients were subjected to clinical examination, abdominal ultrasound and upper endoscopy for gastric biopsy. Biopsies were subjected to urease test, histological examination, and DNA purification. H. pylori, Braf, Kras, MLH1 and MGMT methylation were assessed by quantitative PCR. DNA sequencing was performed to assess Braf and Kras genes mutation. qPCR of H. pylori was significantly higher in patients with adenocarcinoma (group II) than those without adenocarcinoma (group I); with a p < 0.001 as well as in patients with age above 50 years with a p value = 0.008. By applying logistic regression analysis it was reported that the H. pylori qPCR is a significant predictor to the adenocarcinoma with OR = 1.025 (95 % CI: 1. 002-1.048), with sensitivity of 90 % and specificity of 100 %. Adenocarcinomapatients had a significantly higher mean age and levels of H. Pylori, Braf, K-ras, methylated MGMT and methylated MLH1 than those of gastritispatients. DNA sequence analysis of Braf (codon 12) and Kras (codon 600) had genes mutation in gastric adenocarcinoma versus chronic gastritis. CONCLUSION:H. pylori may cause epigenetic changes predisposing the patients to cancer stomach. Estimation of H. pylori by qPCR can be a good predictor to adenocarcinoma. Braf and Kras genes mutation were reveled in gastritis and adenocarcinomapatients.
Authors: Ryan B Corcoran; Hiromichi Ebi; Alexa B Turke; Erin M Coffee; Michiya Nishino; Alexandria P Cogdill; Ronald D Brown; Patricia Della Pelle; Dora Dias-Santagata; Kenneth E Hung; Keith T Flaherty; Adriano Piris; Jennifer A Wargo; Jeffrey Settleman; Mari Mino-Kenudson; Jeffrey A Engelman Journal: Cancer Discov Date: 2012-01-16 Impact factor: 39.397
Authors: Tarek Aboushousha; Noha Helal; Olfat Hammam; Manar Ibrahim; Samar Khaled; Amr Mostafa; Amgad Anas Journal: Open Access Maced J Med Sci Date: 2018-10-10