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Expression of epidermal growth factor receptor variant type III (EGFRVIII) in squamous cell carcinoma of head and neck (SCCHN) by immunohistochemical (IHC) staining (400×). (A) Primary carcinoma; (B) Metastatic carcinoma; (C) Control. EGFRVIII was expressed mainly on the cell membrane (yellow staining) and blue staining was the nuclei.
