KITLG and nasopharyngeal carcinoma: However, among 51 of the 75 NPC patients who had been treated, significant positive correlations were found between EBV load and IL-10 [r(49) = 0.535, p < 0.01], IL-6 and IL-10 [r(49) = 0.474, p < 0.01], and between TGF-β1 and SCF [r(49) = 0.464, p < 0.01].