Publication date: May 2016
Source:European Journal of Cancer, Volume 59
Author(s): Fabian Finkelmeier, Özge Canli, Andrea Tal, Thomas Pleli, Jörg Trojan, Michael Schmidt, Bernd Kronenberger, Stefan Zeuzem, Albrecht Piiper, Florian R. Greten, Oliver Waidmann
AimImmunotherapy in cancer is a recent and very promising approach, namely the inhibition of the PD/programmed death-ligand 1 (PD-L1) axis. Here we aimed to investigate the prognostic value of a soluble form of PD-L1 in hepatocellular carcinoma (HCC) patients.MethodsHCC patients were prospectively recruited and soluble programmed death-ligand 1 (sPD-L1) levels were determined. sPD-L1 levels were compared to stages of cirrhosis and HCC. The association of the sPD-L1 levels and overall survival (OS) was assessed.ResultsTwo hundred fifteen patients with HCC were prospectively included. The median serum sPD-L1 concentration in patients with HCC was 0.5 ng/ml (range 0.03–6.04). Soluble PD-L1 levels positively correlated with the stage of cirrhosis and with stages of HCC. Furthermore, sPD-L1 correlated positively with a marker of macrophage activation (sCD163) and inflammation (C-reactive protein). The cut-off for high-level sPD-L1 (>0.8 ng/ml) was defined by sPD-L1 levels determined in a healthy control cohort. Patients with high serum sPD-L1 concentrations had an increased mortality risk (hazard ratio 3.340, 95 % confidence interval 1.609–6.934, P<0.001), while very low PD-L1 levels seem to come along with better prognosis. High sPD-L1 levels were associated with mortality independently from cirrhosis stage, alpha-fetoprotein and sCD163 levels in a multivariate Cox regression model.ConclusionsWe conclude that a high sPD-L1 level is a possible prognostic indicator for a poor outcome in HCC patients. The predictive value of sPD-L1 levels for a successful anti-PD1/PD-L1 therapy should be investigated in the future.
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