CD274 and idiopathic pulmonary fibrosis: The results showed that PD-L1 expression and PD-1 checkpoint pathway in cancer (PPCPC) had a Degree of 92, Betweenness Centrality of 0.1465, and Closeness Centrality of 0.6029, thus PPCPC were predicted to be the most core signaling pathways of Danhong injection acting on IPF.