In TCGA breast cancers (n=1,089), PAM50 Luminal A (LumA), Luminal B (LumB), and Her2-enriched (Her2) breast cancer subtypes had the lowest expression of SATB1 relative to PAM50 Basal-like (Basal) and Normal-like (Normal) intrinsic subtypes (post hoc Wilcoxon adj. This evidence concerns the gene ERBB2 and breast cancer.