Fig. 1

Representative figures showing IHC slides with different scores. Immunohistochemical staining for EGFR in BC tissue samples. Four representative fields are shown after IHC staining with anti-EGFR (1:1000 dilution). Negative (Score 0), weak (Score 1), intermediate (Score 2), and strong (Score 3). EGFR expression was observed in the cytoplasm, membrane, and/or nucleus in our BC specimens. The intensity of EGFR staining was often heterogeneous within the same cancer tissue.