Genetic and Epigenetic Markers to Identify High Risk Patients for Multiple Early Gastric Cancers after Treatment with Endoscopic Mucosal Resection

Abstract

Summary The development of multiple gastric cancer is a major problem after the endoscopic resection of the first early gastric cancer. To find out markers to identify high risk patients, we analyzed the microsatellite instability (MSI) status and hypermethylation of tumor-related genes in multiple gastric cancers. Sixty-four adenocarcinomas resected by endoscopy, including 32 early solitary gastric cancers (SGCs) from 32 patients and 32 multiple gastric cancers (MGCs) from 14 patients, were employed. We analyzed MSI and the methylation status of promoter regions of the hMLH1, MGMT, p16 and E-cadherin using methylation-specific Polymerase Chain Reaction. Expression levels of hMLH1 were examined by immunohistochemistry. MSI (+) was detected in 5 of the 14 (35.7%) patients with MGCs, and in only 3 of the 32 patients (9.3%) with SGCs. Significant differences were observed between the 2 groups (p<0.001). Hypermethylation of hMLH1 was more frequently detected in MGCs than in SGCs (p<0.01), whereas significant difference was not observed in the frequency of MGMT, p16 or E-cadherin promoter methylation between the 2 groups. In conclusion, our results indicate that inactivation of hMLH1 through promoter hypermethylation may be involved in the development of multiple gastric cancers following the MSI pathway.

Serum Protein and Genetic Tumor Markers of Gastric Carcinoma

“…Additionally, the aberrant methylation of gene promoters is associated with the multiple gastric cancer. Fukuda et al (2007) found that the hypermethylation of hMLH1 gene was more frequently detected in early multiple gastric cancers than in early solitary gastric cancers, indicating that inactivation of hMLH1 through promoter hypermethylation may be involved in the development of multiple gastric cancer.…”

Aberrantly methylated MGMT, hMLH1 and hMSH2 in tumor and serum DNA of gliomas patients

“…Recently, hypermethylated genes have also been detected in DNA from plasma, serum, urine, sputum, faeces by methylation-specifi c PCR (MSP) [9][10][11] . As this method can detect as little as one methylated gene per 1,000 unmethylated copies, it has sufficient sensitivity to detect low concentrations of tumor DNA in serum.…”