Toll-like receptor 9 expression in mucoepidermoid salivary gland carcinoma may associate with good prognosis.

Background: Mucoepidermoid carcinoma (MEC) is the most common salivary gland malignancy. Although several biomarkers have been evaluated, histological grade remains the most valuable prognostic marker. Toll-like receptor 9 (TLR9) is an immune receptor recognizing microbial DNA.