IL6 and asthma: At-risk patients showed poorer control of asthma, a higher treatment step, higher percentage of oral corticosteroid usage, higher WBC and blood neutrophil counts, lower blood eosinophil counts, higher serum H2O2 and IL-6 levels, and lower percentages of predicted vital capacity (%VC) and forced vital capacity (%FVC) than stable patients (Table 1).