ERBB2 and neoplasm: The majority of luminal tumours (A and B) expressed both ER (18/21 cases, 85.7 %; and 9/11 cases, 81.8 % respectively) and PR (20/21 cases, 95.2 %; and 10/11 cases, 90.9 % respectively), while no HER2 + or TN tumours expressed these hormonal markers (P < 0.001, Chi-square test).