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NPTX2 expression was correlated with circ_0054537 in RCC via miR-640. (a) Pearson’s correlation analysis analyzed the correlation between circ_0054537 and NPTX2 mRNA levels in RCC tissues. (b, c) Western blotting detected PTX2 protein level in 786-O and A498 cells transfected with si-con or si-circ_0054537#1, and co-transfected with si-circ_0054537#1 and in-miR-con or in-miR-640. ***P < 0.001
