ATRA-dependent anti-tumor activity in short-term cultures of primary breast tumorsTissue slices deriving from surgical specimens were challenged with vehicle (DMSO) or ATRA (0.1 μM) for 48 h.The panel illustrates examples of the immuno-histochemical data obtained in four representative cases: (i) Luminal-A (Lum A); (ii) Luminal-B (Lum B); (iii) Her2+ with RARA coamplification (Her2+/RARA+) and (iv) triple negative (TN). 