NR1H3 and idiopathic pulmonary fibrosis: The relative expression levels of LXRα and miR-155 in normal and IPF lung fibroblasts cultured under normoxic conditions showed no significant correlation (Spearman ρ and 95% CI): normal fibroblasts r = 0.263 (−0.310 to 0.69) and IPF fibroblasts r = 0.439 (−0.072 to 0.767).