Abstract
Problem
To determine the correlation between IL10, a Th2-type inhibitory cytokine, clinical outcome and survival in HNSCC patients.
Methods
IL10 levels in the serum of newly-presenting, untreated, patients with HNSCC were measured pre-treatment (n=107) and 4–6 weeks after treatment (n=43), and were compared with a cohort of healthy controls (n=40) of similar age and sex. A commercial IL10 ELISA (Biosource) with a minimum detectable level of 0.2 pg/ml was used. Statistical analysis of associations between the levels and detectability of IL10 and clinical outcome and survival were done.
Results
Both IL10 detectability and levels were significantly higher in patients than in controls (p=0.001). Post treatment, IL10 levels dropped significantly (p=0.02). Pretreatment, IL10 levels were significantly elevated in the advanced stage of the disease (III/IV vs. I/II), in node positive patients and in patients with bulkier tumor load (T3/T4 vs. T1/T2); p=0.005, 0.037 and 0.001 respectively. The larynx (n=36), oropharynx (n=25) and pharynx (n=16) showed significantly higher levels and increased detectability of IL10 in the pre-treatment group when compared to the post treatment group, however, oral cavity tumors (n=21) showed the opposite. Finally, the detectability of IL10 significantly correlated with poorer survival (Kaplan-Meier, p=0.026) after a mean follow up of 15 (range 1–36) months.
Conclusion
IL10 levels drop significantly once the tumor mass is removed suggesting that this is the most important source of the circulating cytokine. IL10, as well as the tumor bulk, the nodal status and the overall tumor stage, were shown to be independent factors in predicting a poorer clinical outcome and worse survival in tumors originating in the larynx, pharynx and oropharynx, but not oral cavity, suggesting distinct inter-tumour differences.
Significance
IL10 could play a potential role as a prognostic marker in HNSCC, in addition to the possible manipulation of IL10 in future immunotherapeutic agents.
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