CXCL8 and oropharynx squamous cell carcinoma: IL-8 is elevated in the gingival tissue of periodontitis patients, and both IL-6 and IL-8 are potential biomarkers for oral and oropharyngeal squamous cell carcinoma (Sahibzada et al., 2017; St John et al., 2004; Finoti et al., 2017).