GDF15 and primary biliary cholangitis: Serum levels of GDF15 were significantly higher in non-cirrhotic PBC patients than in healthy controls (3037.41 ± 568.91 vs. 656.58 ± 146.13 pg/mL; p = 0.002) (see Figure 1(b)), and serum levels of GDF15 were significantly higher in cirrhotic PBC patients than in healthy controls (4926.44 ± 662.84 vs. 656.58 ± 146.13 pg/mL; p < 0.001) or non-cirrhotic PBC patients (4926.44 ± 662.84 vs. 3037.41 ± 568.91 pg/mL; p = 0.009) (see Figure 1(b)).