Abstract
To study the morphology and immunohistochemical expression of nasopharyngeal intraepithelial lesions and to understand their place in nasopharyngeal carcinogenesis. Nine cases of nasopharyngeal intraepithelial lesion (NPIL) were diagnosed during nasopharyngeal biopsy screening for nasopharyngeal carcinoma (NPC). Two cases were associated with early invasion. All cases demonstrated specific histological features and consistent positivity on in-situ hybridization for Epstein-Barr virus (EBV)-encoded RNA. Pure NPIL lesions showed low-grade morphology while lesions associated with early invasion were high grade. Immunohistochemical studies showed increased expression of bcl-2 and essentially negative findings for BZLF1 and LMP1. High-grade lesions had relatively stronger expression of bcl-2 and p53. NPIL harbours latent EBV infection and has malignant potential. Multiple steps are involved in its occurrence and progression. Low-grade and high-grade lesions should be managed differently.
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