[31] studying various blood biomarkers in IPF patients found an inverse correlation between serum KL‐6 with FVC% at various time point (baseline r = −0.67, p < 0.001; 6 months r = −0.57, p < 0.01; 12 months r = −0.60, p < 0.001; 18 months r = −0.41, p < 0.05 and 24 months r = −0.50, p < 0.01). The gene discussed is MUC1; the disease is idiopathic interstitial pneumonia.