European Urology Focus

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Raphael Sandaltzopoulos, PhD, MBA Professor at MBG (Molecular Biology) Lab. of Gene Expression, Molecular Diagnosis and Modern Therapeutics,
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European Urology Focus MicroRNAs in Serum Exosomes as Potential Biomarkers in Clear-cell Renal Cell Carcinoma  Wei Zhang, Maowei Ni, Ying Su, Hua Wang, Shaoxin Zhu, An Zhao, Guorong Li  European Urology Focus  DOI: 10.1016/j.euf.2016.09.007 Copyright © 2016 European Association of Urology Terms and Conditions

Fig. 1 (A) Flow cytometry analysis of tumor-associated exosomes. Appropriate gating reveal strong intensity for the marker EpCAM. (B) Immunofluorescence staining after separation of tumor-associated exosomes clearly showed the exosome marker CD9 on the surface of exosome-bead complexes. European Urology Focus DOI: (10.1016/j.euf.2016.09.007) Copyright © 2016 European Association of Urology Terms and Conditions

Fig. 2 Fig. 2. Scatter plots of expression levels of exosomal (A) miR-210, (B) miR-1233, and (C) miR-15 in serum from patients with clear-cell renal cell carcinoma (ccRCC; n=82) and healthy controls (n=80). The exosomal miR-210 level was significantly higher in ccRCC patients (mean expression 13.5E−3±4.6E−3) than in the controls (mean expression 1.3E−3±0.2E−3; p<0.001). The exosomal miR-1233 level was significantly higher in ccRCC patients (mean expression 115.9E−3±30.7E−3) than in the controls (mean expression 4.5E−3±0.6E−3; p<0.001). No significant difference was observed for the level of exosomal miR-15a (p=0.619). miRNA expression levels (log10 scale on the y-axis) were normalized to U6. The line represents the median value. A Mann-Whitney U-test was used to determine statistical significance. European Urology Focus DOI: (10.1016/j.euf.2016.09.007) Copyright © 2016 European Association of Urology Terms and Conditions

Fig. 3 Scatter plots of expression levels of exosomal (A) miR-210 and (B) miR-1233 in serum from patients with clear-cell renal cell carcinoma (ccRCC) of different TNM stages (20 with stage 1, 32 with stage 2, 30 with stage 3). Expression levels of exosomal miR-210 and miR-1233 in each stage were significantly higher than in control individuals (both p<0.01). No significant differences were observed between the different TNM stages. miRNA expression levels (log10 scale on the y-axis) were normalized to U6. The lines represent median values. A Mann-Whitney U-test was used to determine statistical significance. European Urology Focus DOI: (10.1016/j.euf.2016.09.007) Copyright © 2016 European Association of Urology Terms and Conditions

Fig. 4 Changes in expression levels of exosomal (A) miR-210 and (B) miR-1233 in serum from patients with clear-cell renal cell carcinoma (ccRCC; n=10) before (pre-Op) and 7 d after (post-Op) surgical tumor removal. The expression level of exosomal miR-210 was significantly lower in postoperative (mean expression: 9.6E−3±3.2E−3) than in preoperative samples (mean expression 1.3E−3±0.3E−3; p=0.004). The expression level of exosomal miR-1233 was also significantly lower in postoperative (mean expression 32.8E−3±15.6E−3) than in preoperative samples (mean expression 11.4E−3±7E−3; p=0.008). miRNA expression levels (log10 scale on the y-axis) were normalized to U6. Statistically significant differences were determined using the Wilcoxon test. European Urology Focus DOI: (10.1016/j.euf.2016.09.007) Copyright © 2016 European Association of Urology Terms and Conditions

Fig. 5 Receiver operating characteristic (ROC) curve analysis for exosomal miR-210 and miR-1233 in discrimination of patients with clear-cell renal cell carcinoma from control individuals. (A) Exosomal miR-210 yielded an AUC (area under the ROC curve) of 0.69 (95% confidence interval [CI] 0.61–0.77) with sensitivity of 70% and specificity of 62.2%. (B) Exosomal miR-1233 yielded an AUC of 0.82 (95%CI 0.75–0.89) with sensitivity of 81% and specificity of 76%. European Urology Focus DOI: (10.1016/j.euf.2016.09.007) Copyright © 2016 European Association of Urology Terms and Conditions