IGFBP5 and idiopathic pulmonary fibrosis: An important pathological feature of senescent fibroblasts is the SASP and while the SASP of IPF‐LFs has previously been described, its characterization was limited to the gene expression of a few inflammatory genes.24 In this study, the levels of IL‐6, CCL2, CCL5 and IGFBP5 in IPF‐LF conditioned medium were shown to be higher than Ctrl‐LF conditioned medium (Figure 1E).