The percentages of macrophages and neutrophils in BAL were similar between F-ILD and NF-ILD patients (Figure 4A,B) and correlated with SLPI (%macrophages: r = 0.45, p < 0.001; %neutrophils: r = 0.24, p = 0.04) and lysozyme (%macrophages: r = 0.52, p < 0.001; %neutrophils: r = 0.51, p < 0.001) levels in the BAL of ILD patients (Figure 4C,F). Here, LYZ is linked to interstitial lung disease.