Abstract
MicroRNAs (miRNAs), abundant and highly stable in the plasma, have been widely reported. This greatly pursued us to investigate whether plasma miRNAs could be considered as powerful biomarkers for diagnosing bladder cancer (BC). We performed a plasma miRNAs profile with the TaqMan Low Density Array, and a two-phase validation to detect the candidate miRNAs expression by quantitative PCR. The receiver operating characteristic curve (ROC) and the area under curve (AUC) were used to evaluate diagnostic accuracy. A total of eight plasma miRNAs abnormally expressed between BC patients and healthy controls in microarray analysis (i.e., elevated miRNAs for miR-505, miR-363 and miR-663b, and decreased for miR-99a, miR-194, miR-100, miR-497 and miR-1 in BC plasma). In further independent cohorts, miR-497 and miR-663b with significantly differential expression were confirmed. Moreover, the AUC, sensitivity and specificity were raised to 0.711 (95% CI = 0.641-0.780), 69.7% and 69.6%, respectively, when miR-497 and miR-663b were integrated. This is the first study systematically exploring the existence of specific plasma miRNAs as early diagnostic biomarkers for BC in Chinese population; and these findings supported that plasma miR-497 and miR-663b could be promising novel circulating biomarkers in clinical detection of BC.
Highlights
Prognosis[13,14]
Several miRNAs, previously identified in cells and tissues, were detected in extracellular fluids[15,16]; especially, the plasma miRNAs have widely drawn the researchers’ attention for their unique merits: detectability, stability and tumor specificity[17,18,19]. It has been identified several differentially expressed plasma miRNAs inferring to Bladder cancer (BC) diagnosis[20,21], but no studies were performed in Chinese BC patients
By screening the whole-genome plasma miRNAs between BC patients and cancer-free controls through TaqMan Low Density Array (TLDA) technology, we identified eight differentially expressed plasma miRNAs
Summary
Several miRNAs, previously identified in cells and tissues, were detected in extracellular fluids (e.g. plasma, serum or seminal plasma)[15,16]; especially, the plasma miRNAs have widely drawn the researchers’ attention for their unique merits: detectability, stability and tumor specificity[17,18,19]. To date, it has been identified several differentially expressed plasma miRNAs inferring to BC diagnosis[20,21], but no studies were performed in Chinese BC patients. According to receiver operating characteristic curve analysis and functional studies, we aimed to find a promising circulating biomarker in BC diagnosis
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