MUC1 and interstitial lung disease: Furthermore, SAL-P-CRP was significantly correlated with percentage of predicted forced lung vital capacity (%FVC), percentage of predicted lung vital capacity (%VC) and percentage of predicted lung diffusing capacity for carbon monoxide (%DLco) that refer to lung function, serum ILD markers including Krebs von den Lungen-6 (KL-6) and surfactant protein-D (SP-D), skin fibrosis score (modified Rodnan’s total skin thickness score: mRSS), and serum CRP (Figure 3C).