<![CDATA[Introduction: Nasopharyngeal carcinoma (NPC) is a lymphoepithelial malignancy of the nasopharynx, one of the etiologies is the infection of Epstein–Barr virus in undifferentiated type of nasopharyngeal carcinoma. The Epstein-Barr virus Nucleus Antigen-1 (EBNA-1) is Epstein–Barr virus-encoded proteins as regulatory virus transcription. Epithelial Growth Factor Receptor (EGFR) consist of a single polypeptide chain of amino acid, ErbB members, tyrosine kinase receptor, a transmembrane glycoprotein encoded by gen location in the short arms of a chromosome and overexpression in epithelial tumors. EGFR plays a central role in signal transduction pathways which regulate key cellular functions in epithelial malignancies. and may also present in NPC. Objective: To investigate this relation of expression patterns of EBNA-1 and EGFR in a histological type of undifferentiated nasopharyngeal carcinoma. Method: Observational, analytical study with a cross-sectional method of 34 formalin-fixed within inclusion criteria are EBNA-1 and positive staining of EGFR expression (30 patients) and exclusion criteria of negative staining of EGFR (4 patients). All biopsy samples work with paraffin embedded and resulted in hematoxylin-eosin undifferentiated histological types of the advanced stage in nasopharyngeal carcinoma. EBNA-1 and EGFR expression used immunohistochemistry staining. Result: EBNA-1 and EGFR expression level were detection and correlated with the advanced stadium of nasopharyngeal undifferentiated carcinoma. Conclusion: EBNA-1 is significantly related to EGFR expression in the advanced stadium of undifferentiated nasopharyngeal carcinoma. Overexpression of EGFR is mostly found in advanced NPC but not in all ages. Male is dominated and overall age below 55 years old. Screening of EGFR with immunohistochemistry is highly considered before anti-EGFR treatment]]>
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