VEGFA and idiopathic pulmonary fibrosis: However, comprehensive studies on the pathogenesis and clinical application of the two in IPF-ILD have been relatively insufficient, such as lack of respondent operating characteristic (ROC) curve analysis, or longitudinal information regarding course over time, etc. Therefore, this study further deepens the understanding of the roles of these two factors in IPF-ILD and explores their potential applications in the clinic and confirms the important role of serum VEGF and KL-6 in the development of IPF-ILD.