TLR3 and pulmonary mucoepidermoid carcinoma: In our previous study, we confirmed that TLR3 was expressed in NCI-H292 cells, a human pulmonary mucoepidermoid carcinoma cell line, and a synthetic dsRNA analogue, poly(I:C), used as a TLR3 ligand to mimic viral infection, induced the expression and release of MUC5AC from the cells [22].