The GEM data from our rat bladder cancer model suggest that MAPK9 gene is down-regulated in rat bladder tumors as compared with normal bladder tissues, which is consistent with results from other human gene expression data sets (http://www.ncbi.nlm.nih.gov/geo/, GSE13507; https://www.oncomine.org/, TCGA bladder, reporter: 05-179622439). This evidence concerns the gene MAPK9 and urinary bladder neoplasm.