TLR5 and nasopharyngeal carcinoma: TLR5 was expressed on the nuclear membranes and in the cytoplasm in both malignant NPC and benign adenoid tissues, but the benign nasopharyngeal epithelium expressed TLR5 in the basal cells only (Fig. 1g), while the expression was ubiquitous in NPC (Fig. 1c, d).