In the tumour cells of NPC biopsies p65 is localised in the cytoplasm. Immunohistochemical staining for p65 was carried out on tissue arrays containing 11 NPC biopsies with matched normal nasopharyngeal control tissue isolated from the same patients. Two examples of this staining (A and B) are presented where black arrows indicate tumour cell islands and white arrows indicate the cellular infiltrate surrounding tumour cells. A higher magnification of the cells bounded by a black box in (B) is presented in (C) where the black arrow indicates the cytoplasm and the white arrow indicates the nucleus. Sections were counterstained with haematoxylin.