CX3CR1 and head and neck squamous cell carcinoma: Expression levels of adhesion molecules and chemokine receptors CD11a (integrin-α L; LFA-1), CD11b (integrin-α M; Mac-1), CD11c (integrin-α X), and CX3CR1 (CX3CL1 receptor) on peripheral blood monocyte subsets from HNSCC patients before and after radio(chemo)therapeutic treatment were analyzed using flow cytometry and compared to healthy donors (Fig. 2).