Extrahepatic (ie, systemic) PFS (PFS-S) according to IL-6 levels, divided by tertiles, at 1 hour and 18 hours after immunoembolization. Both variables are log-transformed (systemic PFS: 4.5 represents 2.95 months, 5.5 represents 8.05 months, and 6.5 represents 21.85 months), and error bars represent standard errors of the log-transformed mean systemic PFS in each tertile.