ABCG8 and idiopathic pulmonary fibrosis: No significant association was detected between the ABCG5 gene expression levels in the spleen (OR = 1.11, 95% CI: 0.99 – 1.24, P = 0.087), ABCG8 expression in colon transverse (OR = 1.04, 95% CI: 0.86 – 1.25, P = 0.713) and IPF risk.