The concentration of IL-8 in BALF and EBC, the spirometric results (FEV1/FVC, FEV1, FVC, DLCO) and the numbers of macrophages, lymphocytes, neutrophils and eosinophils in BALF were not significantly different in the patients with pulmonary fibrosis when compared with patients without pulmonary fibrosis (Table 5). Here, CXCL8 is linked to pulmonary fibrosis.