Interestingly, three patients maintained very high KL-6 concentrations after 6 and 9 months of follow-up (median IQR, t0: 1006 (1000–1011); t1: 595 (570–1799); t2: 527 (498–1373)), showing simultaneous HRCT evidence of interstitial lung involvement (Fig. 1S). The gene discussed is MUC1; the disease is medical procedure.