In order to test whether hsa_circRPPH1_015 exerts cancer-promoting effect via regulation of ELK1, a target gene of miR-326, cell proliferation (Figure 6F; Figure S5E), invasion (Figures 6G,H; Figures S5F,G), and cell cycle distribution (Figures 6I,J; Figures S5H,I) were examined by EdU, Transwell, and flow cytometry, respectively. Here, ELK1 is linked to cancer.