Expression levels of cholesterol uptake-, synthesis-, and secretion-associated genes. SREBP-2 sterol regulatory element-binding protein 2, LDLR LDL receptor, HMGR HMG-CoA reductase, MTP microsomal triglyceride protein, ApoB apolipoprotein B, ABCG5 ATP-binding cassette G5, NPC1L1 Niemann-Pick C1 like 1, LXRα liver X receptor α. * Significant difference between PBC patients and normal control