Abstract
Purpose
Preclinical studies show that sorafenib, a multitarget kinase inhibitor, displays anti-proliferative, anti-angiogenic, and pro-apoptotic properties in hepatocellular carcinoma (HCC). However, the determinants of sorafenib sensitivity in vivo remain largely unknown.
Methods
We assessed the expression of Mcl-1, activated/phosphorylated extracellular signal-regulated kinase (pERK) 1/2, and activated/phosphorylated AKT (pAKT) in pretreatment tumor specimens from 44 patients with advanced HCC who received sorafenib. Furthermore, we assessed MYC and MET gene copy numbers (GCN) by fluorescence in situ hybridization.
Results
Poorer overall survival (OS) times were correlated with pERK expression [hazard ratio (HR) 1.013; 95 % CI 1.003–1.035] and Mcl-1 expression (HR 1.016; 95 % CI 1.002–1.030) in pretreatment tumor samples. Expression levels of pERK and Mcl-1, however, were not correlated with time to tumor progression (TTP). Increased pERK expression was positively associated with higher Cancer of Liver Italian Program scores (P = 0.012) and was prognostic in patients with scores 2–6 but not in those with scores 0–1. pERK expression was significantly less frequent in specimens sourced from previous surgical procedures compared to biopsy samples (9.6 vs. 92.3 %, respectively; P < 0.0001). Analysis of pAKT expression, MET and MYC GCN, did not indicate any prognostic nor predictive values for these biomarkers in terms of survival.
Conclusions
Expression levels of Mcl-1 and pERK are associated with reduced OS in HCC patients treated with sorafenib and might be useful markers for risk stratification. However, in contrast to previous findings, pERK expression levels, as well as other biomarkers tested, did not affect TTP.
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Acknowledgments
We thank research staff and technicians from the Department of Pathology at Humanitas Cancer Center, Istituto Clinico Humanitas IRCCS, for their supportive work in immunohistochemistry testing and logistics.
Conflict of interest
Armando Santoro has participated in advisory activities for Bayer HealthCare Pharmaceuticals. No potential conflicts of interest were disclosed by the other authors.
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Personeni, N., Rimassa, L., Pressiani, T. et al. Molecular determinants of outcome in sorafenib-treated patients with hepatocellular carcinoma. J Cancer Res Clin Oncol 139, 1179–1187 (2013). https://doi.org/10.1007/s00432-013-1429-x
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DOI: https://doi.org/10.1007/s00432-013-1429-x