IL6 and leukoplakia: The mean serum IL-6 levels in OSCC, leukoplakia, and the control group were 61.23 pg/mL, 19.07 pg/mL, and 3.1 pg/mL, respectively, whereas the mean salivary IL-6 levels were 93.6 pg/mL, 21.04 pg/mL, and 6.91 pg/mL, respectively (Table 3).