The levels of TGF-β in BAL were increased in F-ILD when compared to that in NF-ILD patients (382 ± 26.6 vs. 170 ± 23.7 pg/mL, p < 0.001, respectively) (Figure 3A) and were negatively correlated with SLPI (r = −0.46, p < 0.001) or lysozyme (r = −0.29, p = 0.02) levels in the BAL of ILD patients (Figure 3B,C). This evidence concerns the gene TGFB1 and interstitial lung disease.