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Updated: May 26, 2026

Characterize Disease-related Mutants of RAF Family Kinases by Using a Set of Practical and Feasible Methods
Published on: July 17, 2019
Sorafenib: complexities of Raf-dependent and Raf-independent signaling are now unveiled
Yasunobu Matsuda1, Manabu Fukumoto
1Department of Medical Technology, Niigata University Graduate School of Health Sciences, Asahimachi-dori, Niigata, Japan. yasunobu@med.niigata-u.ac.jp
Abstract:
Hepatocellular carcinoma (HCC) is the most common primary cancer worldwide. The only current drug available for clinical treatment of HCC is sorafenib, which inhibits multiple signaling kinases including Raf family members, platelet-derived growth factor receptor, vascular endothelial growth factor receptors 1 and 2, c-Kit, and Fms-like tyrosine kinase 3. Many studies have revealed that the mechanism underlying the antitumor effect of sorafenib is complex. Because sorafenib inhibits C-Raf more potently than B-Raf, the therapeutic efficacy of sorafenib is strongly influenced by the relative expression and activity of B-Raf and C-Raf and the complex interactions between these factors. Moreover, Rafindependent signaling mechanisms have recently emerged as important pathways of sorafenib-induced cell death. Basic research studies have suggested that using sorafenib as part of a combination therapy may improve its effect, although this has yet to be confirmed by clinical evidence. Further studies of the functional mechanism of sorafenib are required to advance the development of targeted therapy for HCC. To aid future work on sorafenib, we here review the current literature pertaining to sorafenib signaling and its clinical efficacy in both monotherapy and combination therapy.
Insights
Sorafenib is a key drug for hepatocellular carcinoma (HCC), but its effectiveness is complex, involving both Raf-dependent and independent pathways. Combination therapies may enhance sorafenib
Area of Science:
- Oncology
- Molecular Biology
- Pharmacology
Background:
- Hepatocellular carcinoma (HCC) is a prevalent global cancer.
- Sorafenib is the sole approved drug for HCC, targeting multiple signaling kinases.
- The antitumor mechanisms of sorafenib are intricate and not fully understood.
Purpose of the Study:
- To review the current literature on sorafenib's signaling pathways.
- To analyze sorafenib's clinical efficacy in monotherapy and combination therapy for HCC.
- To highlight areas for future research in targeted HCC therapy.
Main Methods:
- Literature review of studies on sorafenib signaling and clinical efficacy.
- Analysis of sorafenib's interaction with Raf family members (C-Raf, B-Raf).
- Examination of Raf-independent signaling pathways involved in sorafenib's action.
Main Results:
- Sorafenib's efficacy is influenced by the relative expression and activity of B-Raf and C-Raf.
- Raf-independent signaling pathways contribute to sorafenib-induced cell death.
- Preclinical studies suggest combination therapy may improve sorafenib's effect, but clinical evidence is pending.
Conclusions:
- Further research into sorafenib's functional mechanisms is crucial for advancing HCC targeted therapy.
- Understanding complex signaling interactions is key to optimizing sorafenib treatment.
- Investigating combination therapies holds promise for enhancing sorafenib's clinical utility.
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