Tissue slices corresponding to the indicated patients were treated with vehicle (DMSO) or ATRA (0.1 μM) for 48 h. Whole-genome gene expression studies were performed on the extracted total RNA using a microarray platform.The heat-map shows the genes significantly up- or down-regulated by ATRA (P < 0.005, paired t-test) in either Luminal-A and -B (Lum) or triple-negative (TN) tumors, and the results are expressed as the log2 ratio observed between the ATRA and vehicle-treated samples. 