Hierarchical cluster analysis of the 315-sample combined test set using the Intrinsic/UNC gene set reduced to 306 genes. (A) Overview of complete cluster diagram. (B) Experimental sample-associated dendrogram. (C) Luminal/ER+ gene cluster with GATA3-regulated genes highlighted in pink. (D) HER2 and GRB7-containing expression cluster. (E) Interferon-regulated cluster containing STAT1. (F) Basal epithelial cluster. (G) Proliferation cluster.