The results demonstrated AUC values of 0.774 for cd19, 0.928 for cxcl13, 0.966 for fcrl5, and 0.959 for slamf7, suggesting that these 4 hub genes exhibited high sensitivity and specificity in the diagnosis of IPF (Fig. 6A). The gene discussed is CD19; the disease is idiopathic pulmonary fibrosis.