CD40LG and primary biliary cholangitis: The comparison of serological indexes across groups (Table 2) revealed that alanine aminotransferase (ALT), aspartate aminotransferase (AST), gamma-glutamyl transpeptidase (GGT), ALP, total bile acid (TBA), and immunoglobulin M (IgM) levels in PBC patients were significantly higher than those in the HC group (all p < 0.05).