By conducting CCK-8 (Figures 5(b) and 5(c)), transwell migration (Figures 5(d) and 5(e)), and transwell invasion assays (Figures 5(f) and 5(g)), we found that the inhibitive effects of circFOXP1 knockdown on RCC cellular behavior were reversed by U2AF2 overexpression. The gene discussed is U2AF2; the disease is renal cell carcinoma.