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Ref Type Journal Article
PMID (22351689)
Authors Su Y, Vilgelm AE, Kelley MC, Hawkins OE, Liu Y, Boyd KL, Kantrow S, Splittgerber RC, Short SP, Sobolik T, Zaja-Milatovic S, Dahlman KB, Amiri KI, Jiang A, Lu P, Shyr Y, Stuart DD, Levy S, Sosman JA, Richmond A
Title RAF265 inhibits the growth of advanced human melanoma tumors.
Journal Clinical cancer research : an official journal of the American Association for Cancer Research
Vol 18
Issue 8
Date 2012 Apr 15
URL
Abstract Text The purpose of this preclinical study was to determine the effectiveness of RAF265, a multikinase inhibitor, for treatment of human metastatic melanoma and to characterize traits associated with drug response.Advanced metastatic melanoma tumors from 34 patients were orthotopically implanted to nude mice. Tumors that grew in mice (17 of 34) were evaluated for response to RAF265 (40 mg/kg, every day) over 30 days. The relation between patient characteristics, gene mutation profile, global gene expression profile, and RAF265 effects on tumor growth, mitogen-activated protein/extracellular signal-regulated kinase (MEK)/extracellular signal-regulated kinase (ERK) phosphorylation, proliferation, and apoptosis markers was evaluated.Nine of the 17 tumors that successfully implanted (53%) were mutant BRAF (BRAF(V600E/K)), whereas eight of 17 (47%) tumors were BRAF wild type (BRAF(WT)). Tumor implants from 7 of 17 patients (41%) responded to RAF265 treatment with more than 50% reduction in tumor growth. Five of the 7 (71%) responders were BRAF(WT), of which 1 carried c-KIT(L576P) and another N-RAS(Q61R) mutation, while only 2 (29%) of the responding tumors were BRAF(V600E/K). Gene expression microarray data from nonimplanted tumors revealed that responders exhibited enriched expression of genes involved in cell growth, proliferation, development, cell signaling, gene expression, and cancer pathways. Although response to RAF265 did not correlate with pERK1/2 reduction, RAF265 responders did exhibit reduced pMEK1, reduced proliferation based upon reduced Ki-67, cyclin D1 and polo-like kinase1 levels, and induction of the apoptosis mediator BCL2-like 11.Orthotopic implants of patient tumors in mice may predict prognosis and treatment response for melanoma patients. A subpopulation of human melanoma tumors responds to RAF265 and can be characterized by gene mutation and gene expression profiles.

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Molecular Profile Treatment Approach
Gene Name Source Synonyms Protein Domains Gene Description Gene Role
Therapy Name Drugs Efficacy Evidence Clinical Trials
RAF265 RAF265 10 0
Drug Name Trade Name Synonyms Drug Classes Drug Description
RAF265 CHIR-265|NVP-RAF265 BRAF Inhibitor 21 CRAF Inhibitor 11 VEGFR2 Inhibitor 35 RAF265 inhibits the activities of several intracellular kinases, including BRAF(V600E), BRAF(wild type), c-RAF (RAF1), VEGF receptor 2 (VEGFR2/KDR), platelet-derived growth factor receptor (PDGFR), colony-stimulating factor (CSF)1R, RET and c-KIT, SRC, STE20, which may result in a reduction of tumor cell growth and proliferation, and tumor cell death (PMID: 22351689, PMID: 28719152).
Gene Variant Impact Protein Effect Variant Description Associated with drug Resistance
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
BRAF wild-type melanoma predicted - sensitive RAF265 Preclinical Actionable In a preclinical study, RAF265 inhibited the growth of melanoma tumors orthotopically implanted in mice, including tumors wild-type for BRAF (PMID: 22351689). 22351689