Fig. 1. HER2 immunohistochemistry (HER2-IHC). (A) 3+, moderate-to-strong complete membrane staining in all tumor area. (B) 2+, variable weak-to-moderate complete membrane staining in ≥ 50% of tumor area. (C) 1+, faint/barely partial membrane staining less than 50% of tumor area. (D) 0, no staining. (magnification × 200).
