IL6 and interstitial lung disease: The significant negative correlations of IgG with C3 and C4 (r = −0.58, p < 0.05, r = −0.54, p < 0.05) while the positive correlations of IL-12p70 (r = 0.32, p < 0.05) and IL-17 (r = 0.34, p < 0.05) with IL-6 were only shown in pSS-ILD patients (Figure 5A) but not pSS-N-ILD cases (Figure 5B).