RRM2 mRNA expression was elevated in the following 20 types of cancers in corresponding data sets, including ACC, BLCA, BRCA, CESC, COAD, CHOL, ESCA, GBM, HNSC, KIRC, KIRP, LIHC, LUAD, OV, PAAD, PRAD, SARC, SKCM, STAD and UCEC (Figure 1E). Here, RRM2 is linked to cancer.