IL18 and acute respiratory distress syndrome: Serum IL-18 levels markedly decreased (424.0 ± 32.19 vs. 290.2 ± 17.14, p = 0.0003) (Figure 1A) and PaO2/FiO2 improved (174.10 ± 65.28 vs. 255.42 ± 92.49, p < 0.0001) (Figure 1B) for ARDS patients after systemic corticosteroid treatment.