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MicroRNAs (miRNAs) can be secreted into body fluids and have thus been reported as a new type of cancer biomarker. This study aimed to determine whether urinary miRNAs act as noninvasive biomarkers for diagnosing bladder cancer. Small RNA profiles from urine were generated for 10 patients with bladder cancer and 10 healthy controls by using next-generation sequencing. We identified 50 urinary miRNAs that were differentially expressed in bladder cancer compared with controls, comprising 44 upregulated and six downregulated miRNAs. Pathway enrichment analysis revealed that the biological role of these differentially expressed miRNAs might be involved in cancer-associated signaling pathways. Further analysis of the public database revealed that  let-7b-5p ,  miR-149-5p ,  miR-146a-5p ,  miR-193a-5p , and  miR-423-5p  were significantly increased in bladder cancer compared with corresponding adjacent normal tissues. Furthermore, high  miR-149-5p  and  miR-193a-5p  expression was significantly correlated with poor overall survival in patients with bladder cancer. The qRT-PCR approach revealed that the expression levels of  let-7b-5p ,  miR-149-5p ,  miR-146a-5p  and  miR-423-5p  were significantly increased in the urine of patients with bladder cancer compared with those of controls. Although our results indicated that urinary miRNAs are promising biomarkers for diagnosing bladder cancer, this must be validated in larger cohorts in the future.

Circulating miRNAs Act as Diagnostic Biomarkers for Bladder Cancer in Urine