FOXK2 and breast cancer: Further, GSEA of RNA-seq results of 427 OC tumor samples in TCGA identified enrichment of “KEGG pathways in cancer,” “breast cancer progenitors,” and “embryonic stem cells early stage” gene sets in specimens with high FOXK2 expression versus those with low FOXK2 expression, further supporting an association between FOXK2 and a stemness phenotype (Supplemental Figure 4G).