LYZ and interstitial lung disease: Lysozyme, SLPI, and LL-37 levels were significantly higher in NF-ILD than in F-ILD patients (lysozyme: 567 ± 46.7 vs. 316 ± 23.0 pg/mL, p < 0.001; SLPI: 2.71 ± 0.27 vs. 1.38 ± 0.09 ng/mL, p < 0.001; LL-37: 186 ± 15.3 vs. 107 ± 5.32 ng/mL, p < 0.001, respectively) (Figure 1A–C).