MSTN and hepatocellular carcinoma: Choi et al. used serum from 238 HCC patients to measure three myokines: myostatin (median value: 3979.3 for male and 2976.3 pg/mL for female), follistatin (median value: 2118.5 for male and 2174.6 pg/mL for female), and IL-6 (median value: 2.5 for male and 2.7 pg/mL for female).