To further determine the expression pattern of ZEB1 in mouse breast cancer, we performed immunostaining of mammary tumours from MMTV-PyMT, MMTV-ErbB2/neu and MMTV-Wnt1 transgenic mice, which spontaneously develop luminal B, HER2+ and basal subtype of breast cancer, respectively23–25. The gene discussed is ZEB1; the disease is breast cancer.