CCL8 and idiopathic pulmonary fibrosis: The CCL8 levels were significantly higher in the IPF patients than those in the NC [6.01(2.75–17.16pg/mL) vs. 0.90(0.00–2.07pg/mL), p = 7.62E-10], those in the NSIP [0.12(0.00–7.47pg/mL), p = 0.00079], those in the HP [1.52(0.00–7.37pg/mL), p = 0.0029] and those in the sarcoidosis patients [0.00(0.00–1.9pg/mL), p = 0.000027] (Fig. 3a).