Comparing RP-ILD and non-RP-ILD patients, the AUC for SPP1, SAA1, and KNG1 were 0.813 (p = 0.001), 0.743 (p = 0.012), and 0.704 (p = 0.046), respectively (Fig. 4D–F). The gene discussed is SPP1; the disease is interstitial lung disease.