Abstract
Therapeutic options for advanced, unresectable hepatocellular carcinoma (HCC) have changed dramatically over the last 3 years. While surgical resection, orthotropic liver transplantation, and localized therapeutic options such as ablation, radiation therapy, and embolization remain therapeutics of choice in localized disease, systemic therapy is the only option in advanced, metastatic HCC. Since the United States Food and Drug Administration (US FDA) approval of sorafenib in 2008, targeted therapies such as sunitinib, tivantinib, brivanib, erlotinib, and linifanib; monoclonal antibody- bevacizumab showed no meaningful improvement in treatment of HCC. However, with improved understanding on the molecular pathophysiology and tumor heterogeneity of HCC, we have made progress in expanding the therapeutic options in advanced HCC. Targeted therapy with lenvatinib, cabozantinib, and regorafenib; monoclonal antibody ramucirumab; immunotherapies nivolumab and pembrolizumab have demonstrated promising results in the clinical trials. The current work outlines the molecular mechanisms and tumorigenesis of HCC, a detailed discussion of the trial results of the approved therapies in HCC, future perspectives and potential options to overcome the challenges of systemic therapy in HCC.
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