IL6 and Behcet disease: Interestingly, we found that the preoperative aqueous flare values were positively correlated with the IL-6 levels in the AqH of the VKH and BD patients but not with the levels in the secretions of the PBMCs; these findings indicate that the elevated IL-6 level in the AqH, rather than some systemic effect, was correlated with a long-term impairment of the blood-aqueous barrier function.