APOF and cancer: The pan-cancer Spearman analysis showed that the mRNA expression of APOF was positively correlated with all six tumor stemness indexes (DNAss, EREG-METHss, DMPss, ENHss, RNAss and EREG.EXPss) with statistical significance for LUAD and with four tumor stemness indexes (DNAss, EREG-METHss, DMPss and ENHss) for LIHC (Fig. 2A–F).