S100A9 and cystic fibrosis: Supplementary assessment of the correspondence between neutrophil numbers and S100A8/S100A9 expression levels per sample was performed by Spearman Rank Correlation analyses, which further supported a likely relationship (p ≤ 0.005 for all results, with the exception of S100A8 in the Bc-CF lungs (p ≤ 0.5)).