Figure 1

Immunohistochemical evaluation of CXCR4 expression. (A) Cytoplasm and membrane staining in a breast cancer tissue as a positive control. (B) Weak or absent staining in a normal nasopharyngeal epidermis. (C) An undifferentiated nasopharyngeal carcinoma of cytoplasm staining with adjacent lymphocytes displaying predominant cytoplasmic staining. (D) An undifferentiated nasopharyngeal carcinoma of membrane staining. (E) An undifferentiated nasopharyngeal carcinoma of nucleus staining. (F) Representative nucleus staining in a keratinising squamous cell carcinoma of nasopharynx. (All of the photomicrographs are high-powered magnified, ×400).