PLK1 and cancer: TERT, CDKN2A, PLK1, FASLG, TNFRSF21, TNF, ZBP1, LEF1, HSPA4, and IDH2 were highly expressed in most tumor tissues, while TARDBP, KLF9, BACH2, CFLAR, TSC1, FLT3, and AXL were expressed at low levels in most cancers (Figure 2C).