Pronounced differences in the serum CCL18 levels were observed between genotypes of the rs2015086 polymorphism in the IPF patients of the derivation cohort; TT 585 ng/mL (IQR 340 –793) and CT 817 ng/mL (IQR 681 – 1278), p = 0.002, as shown in Figure 2C. No differences were present in the baseline characteristics between the patients with CT and TT genotypes of rs2015086, as shown in Table 1. The gene discussed is CCL18; the disease is idiopathic pulmonary fibrosis.