SPDL1 and idiopathic pulmonary fibrosis: The MUC5B promoter risk allele frequency was also higher among SPDL1 risk allele carriers (FET p = 0.001; OR = 2.95; 95% CI: 1.48–5.58) as well as all other IPF cases (FET p = 5.9 × 10−83; OR = 4.47; 95% CI: 3.88–5.14) compared to non-Finnish European controls (Fig. 3b and Supplementary Data 4).