Hou Y, Nitta H, Wei L, Banks PM, Parwani AV, Li Z. Evaluation of Immune Reaction and PD-L1 Expression Using Multiplex Immunohistochemistry in HER2-Positive Breast Cancer: The Association With Response to Anti-HER2 Neoadjuvant Therapy. Clin Breast Cancer. 2018 Apr; 18(2):e237-e244.