CDCA2 and cancer: Subsequently, we examined the co-expression of 25 ICPGs and PPP1R81 in the 33 cancer types and observed marked differences in expression in BLCA, BRCA, CESC, GBM, HNSC, KIRC, KIRP, LGG, LIHC, LUAD, LUSC, PAAD, PRAD, STAD, TGCT, THCA, THYM, and UCEC (Figure 2E).