MUC1 and interstitial lung disease: Since our results support the evidence of an important role played by factor KL-6 in predicting survival of patients with interstitial lung disease and since KL-6 is and being a ready, sensitive and inexpensive marker, our goal would be to evaluate the use of KL-6 to complement the clinical and radiological assessment of patients at baseline and to explore the hypothesis that this marker can guide the decision-making process of physicians.