Figure 1. The relationship between serum IL-8 levels and the clinical outcome in OSCC patients who underwent radical resection of their tumor(s).

The differences in the serum IL-8≥7.5 pg/ml vs. IL-8<7.0 pg/ml in all patients, in the Stage I/II patients and in the Stage III/IV patients were calculated by log-rank test. *P<0.05. NA: not analyzed because the number of OS events was only one.