[Liver Tissue-specific Genes IGFALS,CYP3A4,SLC22A1 and CYP2E1 May be Associated with Poor Prognosis of Liver Cancer].

Objective To explore the function and mechanism of related genes in the occurrence and development of liver cancer, and the possibility of key genes as potential biomarkers and prognostic indicators for the treatment of liver cancer.Methods We selected 4 datasets(GSE57957, GSE121248, GSE36376 and GSE14520)from the GEO database.With P<0.05 and |log2FC|>1 as the thresholds, we used GEO2R and Venn Diagram Software to filter out the common significant differentially expressed genes(DEGs).Cytoscape 3.6.1 plug-ins CytoHubba and molecular complex detection(MCODE)were used to screen out the hub genes and modules of DEGs.In addition, survival analysis of DEGs was performed by gene expression profiling(GEPIA), and Human Protein Atlas(HPA)were used to examine the protein expression levels of key genes in normal liver tissue and liver cancer tissue.Results There were 45 obviously up-regulated genes and 132 down-regulated genes, and MCODE identified 13 clusters.The cluster 1 and cluster 2 with higher scores included 16 genes and 13 genes, respectively.Among the 32 significant DEGs, IGFALS, HGFAC, CYP3A4, SLC22A1, TAT and CYP2E1 demonstrated significantly higher expression levels in liver tissue than in other organs.The HPA immunohistochemistry(IHC)data showed that the expression levels of IGFALS, CYP3A4, SLC22A1 and CYP2E1 in liver cancer tissue were significantly down-regulated and related to the low overall survival rate of patients.Conclusion The liver tissue-specific genes IGFALS, CYP3A4, SLC22A1 and CYP2E1 are under-expressed in liver cancer and associated with poor prognosis, which may be potential biomarkers and prognostic indicators for liver cancer.