Finally, there was a positive correlation between the percentage of neutrophils (r2 = 0.25, p = 0.011) and IL‐8 levels (r2 = 0.61, p < 0.0001) (Figures 2E and F) with IL‐1α concentration in BAL of patients who develop BOS. This evidence concerns the gene IL1A and Buschke-Ollendorff syndrome.