IL1B and bronchiolitis obliterans syndrome: As shown in Figure 2, the levels of IL-1β, IL-6, and IL-8 were higher in the BO patients than in the controls, but only IL-8 levels (BO: 9855 pg/ml, 182-155228 pg/ml; controls: 2734 pg/ml, 366-13018 pg/ml, p < 0.05) were significantly different.