TLR3 and nasopharyngeal carcinoma: We investigated expression of TLR3 by western blot analysis in cell extracts from EBV-positive NPC tumor cells propagated in vitro (C666-1) or as xenografts (C15, C17, C18, C666-1) and in EBV-negative HONE1 and CNE1 cell lines comparatively to a panel of malignant and non malignant epithelial cell lines.