CCNA2 and lung adenocarcinoma: Moreover, we identified upstream miRNAs and lncRNAs of CCNA2 to establish several ceRNA networks or miRNA-CCNA2 mRNA regulatory networks in kidney renal clear cell carcinoma (KIRC), liver hepatocellular carcinoma (LIHC), and lung adenocarcinoma (LUAD) by expression analysis, survival analysis, and correlation analysis.