HDAC9 and cancer: As presented in Figure 4 and Figure 5A, class I HDAC family members correlate positively, while class IIA HDAC genes correlate negatively with cancer stemness across TCGA solid tumors, with the most robust and most consistent associations observed for BLCA, BRCA, COAD (or effectively COADREAD), HNSC, LIHC, LUAD, LUSC, OV, PRAD, and STAD (Figure 4 and Figure S5).