Objective To detect the change and significance of the level of insulin-like growth factor(IGF-I),insulin-like growth factor-binding protein-4(IGFBP-4)and insulin-like growth factor-binding protein-5(IGFBP-4)in bronchoalveolar lavage fluid(BALF)and serum of patients with IPF,and to study their roles in the diagnosis,treatment and clinical significance of patients with IPF. Methods Twenty two patients with IPF and 16 patients with pulmonary sarcoidosis as control group were enrolled from Department of Respir...