Five SNPs showed departure from HWE (Table S2 in Supplementary Material), namely, PRKCE rs628877 (p = 0.02 in combined IPF cases with F_MISS = 0.008), IL-4 rs2243250 (p = 0.01, F_MISS = 0.0146 in Czech IPF and p = 1.2 × 10−4, F_MISS = 0.011 in combined IPF cases), IL-4 rs2070874 (p = 0.02, F_MISS = 0 in Czech IPF), IL-4Rα rs1801275 (p = 0.04, F_MISS = 0 in Czech healthy controls; p = 0.03, F_MISS = 0 in Greek IPF and p = 0.01, F_MISS = 0 in combined IPF cases), and MAPT rs1981997 (p = 0.03, F_MISS = 0.007 in French IPF cases). This evidence concerns the gene IL4R and idiopathic pulmonary fibrosis.