Fig. 1

circDPP4 is upregulated in human PCa tissues. A RT-qPCR analysis of circDPP4 expression levels in 104 pairs of PCa tissues and adjacent normal tissues. *P < 0.05 vs. normal tissues. B Expression of circDPP4, showing higher level in late stage than in early stage of PCa patients. C RT-qPCR analysis of circDPP4 expression levels in PCa cell lines and normal counterpart. *P < 0.05 vs. normal cells