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Maie A. R. St. John, MD, PhD; Yang Li, DDS, PhD; Xiaofeng Zhou, PhD; Paul Denny, PhD; Chih-Ming Ho, PhD; Carlo Montemagno, PhD; Wenyuan Shi, PhD; Fengxia Qi, PhD; Benjamin Wu, DDS, PhD; Uttam Sinha, MD; Richard Jordan, DDS, PhD; Lawrence Wolinsky, DDS, PhD; No-Hee Park, DMD, PhD; Honghu Liu, PhD; Elliot Abemayor, MD, PhD; David T. W. Wong, DMD, DMSc

Arch Otolaryngol Head Neck Surg. 2004;130:929-935.

Background  Since morbidity and mortality rates due to oral cavity and oropharyngeal squamous cell carcinoma (OSCC) have improved little in the past 30 years, early detection or prevention of this disease is likely to be most effective. Using laser-capture microdissection, we have identified the expression of 2 cellular genes that are uniquely associated with OSCC: interleukin (IL) 6 and IL-8. These cytokines may contribute to the pathogenesis of this disease, and have been linked with increased tumor growth and metastasis.

Objectives  To investigate whether IL-6 and/or IL-8 could serve as informative biomarkers for OSCC in saliva and/or serum and to determine if there is a role for saliva as a diagnostic medium for OSCC.

Patients and Methods  Patients with newly diagnosed T1 or T2 oral cavity or oropharyngeal histologically confirmed squamous cell carcinoma were recruited for the study. Age and sex-matched disease-free subjects were used as controls. Using quantitative real-time polymerase chain reaction analysis and enzyme-linked immunosorbent assay, we respectively assessed the expression of IL-6 and IL-8 in serum (controls, n = 32; patients with OSCC, n = 19) and saliva (controls, n = 32; patients with OSCC, n = 32) at the messenger RNA (mRNA) and protein levels.

Main Outcome Measures  Specificity and sensitivity of these biomarkers for OSCC and their predictive value.

Results  Interleukin 8 was detected at higher concentrations in saliva (P<.01) and IL-6 was detected at higher concentrations in serum of patients with OSCC (P<.01). We confirmed these results at both the mRNA and the protein levels, and the results were concordant. The concentration of IL-8 in saliva and IL-6 in serum did not appear to be associated with sex, age, or alcohol or tobacco use (P>.75). Using statistical analysis, we were able to determine the threshold value, sensitivity, and specificity of each biomarker, as well as a combination of biomarkers, for detecting OSCC.

Conclusions  Our findings indicate that IL-8 in saliva and IL-6 in serum hold promise as biomarkers for OSCC. A saliva-based test could be a cost-effective adjunctive tool in the diagnosis and follow-up of patients with OSCC.

From the David Geffen School of Medicine at UCLA (Drs St. John, Liu, and Abemayor), School of Dentistry and Dental Research Institute (Drs Li, Zhou, Shi, Qi, Wu, Wolinsky, Park, and Wong), School of Engineering (Drs Ho and Montemagno), and Jonsson Comprehensive Cancer Center (Drs Park and Wong), Los Angeles; Molecular Biology Institute, Los Angeles (Dr Wong); University of Southern California School of Medicine (Dr Sinha), School of Dentistry (Dr Denny), Los Angeles; and University of California San Francisco School of Dentistry, San Francisco (Dr Jordan). The authors have no relevant financial interest in this article.

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