FGF19 and primary biliary cholangitis: Notably, we observe positive correlations between concentrations of TBIL and FGF19 (r = 0.519, p = 0.003), DBIL and FGF19 (r = 0.590, p < 0.001), and TBA and FGF19 (r = 0.508, p = 0.0004) (Fig 2A) in the serum of PBC patients participating in this study.