IFIH1 and interstitial lung disease: When anti-MDA5+DM patients were divided into RP-ILD (n = 20) and non-RP-ILD groups (n = 19), patients with RP-ILD exhibited significantly higher serum CRP levels than those non-RP-ILD patients [8.81 (2.93–31.88) vs. 3.96 (2.17–7.99) mg/L, p = 0.021] (Table 2) at baseline.