Different EGFR pattern of expression in normal and PCs tissues revealed by immunohistochemistry. A: negative control: lobular breast carcinoma not expressing EGFR. B: positive control: colon carcinoma expressing high levels of EGFR. C: normal prostate tissue not expressing EGFR. D: normal prostate tissue expressing EGFR. E: PC tissue not expressing EGFR. F-G: PC tissues expressing different pattern of EGFR. (Magnification 10X).