KLF4 and cancer: Furthermore, KLF4 expression was significantly correlated with immunoinfiltration in 32 cancer species, with six being significantly negatively correlated: TCGA-CESC (N = 291, r = −0.15, p = 9.6e − 3), TCGA-ESCA (N = 181, r = −0.20, p = 7.0e − 3), TCGA-STES (N = 569, r = −0.19, p = 3.3e − 6), TCGA-HNSC (N = 517, r = −0.20, p = 7.5e − 6), TCGA-LUSC (N = 491, r = −0.13, p = 3.6e − 3), TCGA-TGCT (N = 132, r = −0.34, p = 6.3e − 5).