Zhang H, et al. Biosci Rep 2020.
Bladder cancer is the 11th most common cancer in the world.Bladder cancer can be roughly divided into muscle invasive bladder cancer (MIBC) and non-muscle invasive bladder cancer (NMIBC).The aim of the study was to identify the key genes and pathways associated with the progression of NMIBC to MIBC and to further analyze its molecular mechanism and prognostic significance. We analyzed microarray data of NMIBC and MIBC gene expression datasets (GSE31684) listed in the Gene Expression Omnibus
database. After the data set was analyzed using R software, differentially expressed genes (DEGs) of NMIBC and MIBC were identified. These DEGs were analyzed using Gene Ontology (GO) enrichment, KOBAS-Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analysis, and protein-protein interaction (PPI) analysis. The effect of these hub genes on the survival of bladder cancer patients was analyzed in The Cancer Genome Atlas (TCGA) database. A total of 389 DEGs were obtained, which 270 were upregulated and 119 downregulated. GO and KEGG pathway enrichment analysis revealed that DEGs were mainly involved in the pathway of the protein digestion and absorption, extracellular matrix(ECM) receiver interaction, phantom, toll-like receptor (TLR) signaling pathway, focal adhesion, NF-kappa B signaling pathway, PI3K/Akt signaling pathway, and other signaling pathways. Top 5 hub genes COL1A2, COL3A1, COL5A1, POSTN, and COL12A1 may be involved in the development of MIBC. These results may provide us with a further understanding of the occurrence and development of MIBC, as well as new targets for the diagnosis and treatment of MIBC in the future.