CASP3 and pulmonary fibrosis: By analyzing the target interaction network VCAM1,RELA,CDK2,JUN,CDK1,HSP90AA1,NOS2, SOD1,CASP3,AHSA1, PTGER3 are at the core of the network, which can be regarded as the key targets of Astragalus polysaccharides in treating pulmonary fibrosis.