CCNA2 and cancer: In this study, we first disclosed that the mRNA expression of CCNA2 was upregulated in ACC, BLCA, BRCA, CESC, CHOL, COAD, ESCA, GBM, HNSC, KICH, KIRC, KRIP, LGG, LIHC, LUAD, LUSC, OV, PAAD, PRAD, READ, SKCM, STAD, TGCT, THCA, UCEC, and UCS cancer tissues vs. normal tissues by using TCGA, which indicated that CCNA2 might be an oncogenic molecule in tumorigenesis.