An 8-gene signature, including methylated and down-regulated glutathione peroxidase 3, of gastric cancer

作者：Zhang Xianglan; Yang Jung Jin; Kim Yoon Sun; Kim Ki Yeol; Ahn Woong Shick; Yang Sanghwa^*

来源：International Journal of Oncology, 2010, 36(2): 405-414.

DOI：10.3892/ijo_00000513

• gastric cancer
• biomarker
• gene expression profiling
• methylation

We have identified an 8-gene signature with significant expression differences between gastric cancer and normal gastric tissues. This 8-gene set can predict the normal and cancer status of gastric tissues with more than 96% accuracy in a totally independent microarray dataset. The 8 genes are composed of down-regulated KLF4, GPX3, SST and LIPF, together with up-regulated SERPINH1, THY1 and INHBA in gastric cancer. To corroborate the differential gene expression pattern, we chose GPX3 and examined its expression pattern in detail. A comparison of GPX3 expression pattern shows a broader down-regulated pattern in multiple types of cancers, including cervical, thyroid, head and neck, lung cancers and melanoma than in healthy controls. An immuno-histostaining analysis in tissue microarrays confirms GPX3 down-regulation in gastric cancer. Mechanism-wise GPX3 down-regulation in gastric cancer is due to promoter hypermethylation. Collectively, these results show a correct identification of 8 genes as gastric cancer biomarkers.

• 出版日期2010-2