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  • Title: Positioning of a molecular-targeted agent, sorafenib, in the treatment algorithm for hepatocellular carcinoma and implication of many complete remission cases in Japan.
    Author: Kudo M, Ueshima K.
    Journal: Oncology; 2010 Jul; 78 Suppl 1():154-66. PubMed ID: 20616599.
    Abstract:
    Sorafenib, a molecular-targeted agent that inhibits tumor cell proliferation and angiogenesis by inhibiting RAF serine-threonine kinase and VEGF, PDGF, Flt-3, c-Kit receptor tyrosine kinase, was approved in Europe and North America in 2007 and in Japan on May 20, 2009. In the 10 months since its approval, sorafenib has been prescribed for more than 3,700 patients with advanced hepatocellular carcinoma (HCC), and its efficacy has been confirmed in many cases. According to the consensus statements of the Japan Society of Hepatology in 2010, sorafenib is recommended for advanced HCC with extrahepatic spread or major vascular invasion such as invasion of the 1st branch of the portal vein or the main portal branch of the portal vein in patients with Child-Pugh A liver function. In addition to that, transcatheter arterial chemoembolization (TACE) or hepatic arterial infusion chemotherapy (HAIC) refractory HCC patients with Child-Pugh A liver function are also candidates of sorafenib monotherapy as a second-line treatment option. To date, 15 cases with complete remission (CR) to sorafenib in metastatic advanced HCC patients have been reported in Japan, an event that is rarely reported in other countries. Of the 90 cases treated by ourselves, 2 achieved CR. Factors indicating systemic cancer spread, including multiple liver lesions, lymph node metastases, adrenal metastases, lung metastases and vascular invasion, were completely absent in both cases of CR by 2 and 1 year, respectively. Similarly, three tumor markers (AFP, PIVKA-II, and AFP-L3) completely returned to normal values. Although cases of CR are rare, it seems that there might be racial differences in terms of gene mutations. Clinical trials for other molecular-targeted agents, including sunitinib, brivanib, or linifanib, are ongoing and their outcomes are eagerly awaited. According to a subanalysis of the SHARP study, it is expected that sorafenib in combination with resection, ablation, TACE or HAIC will markedly prolong the overall survival in early-, intermediate- and advanced- stage HCCs.
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