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Ref Type Journal Article
PMID (24422853)
Authors Basile KJ, Le K, Hartsough EJ, Aplin AE
Title Inhibition of mutant BRAF splice variant signaling by next-generation, selective RAF inhibitors.
Journal Pigment cell & melanoma research
Vol 27
Issue 3
Date 2014 May
URL
Abstract Text Vemurafenib and dabrafenib block MEK-ERK1/2 signaling and cause tumor regression in the majority of advanced-stage BRAF(V600E) melanoma patients; however, acquired resistance and paradoxical signaling have driven efforts for more potent and selective RAF inhibitors. Next-generation RAF inhibitors, such as PLX7904 (PB04), effectively inhibit RAF signaling in BRAF(V600E) melanoma cells without paradoxical effects in wild-type cells. Furthermore, PLX7904 blocks the growth of vemurafenib-resistant BRAF(V600E) cells that express mutant NRAS. Acquired resistance to vemurafenib and dabrafenib is also frequently driven by expression of mutation BRAF splice variants; thus, we tested the effects of PLX7904 and its clinical analog, PLX8394 (PB03), in BRAF(V600E) splice variant-mediated vemurafenib-resistant cells. We show that paradox-breaker RAF inhibitors potently block MEK-ERK1/2 signaling, G1/S cell cycle events, survival and growth of vemurafenib/PLX4720-resistant cells harboring distinct BRAF(V600E) splice variants. These data support the further investigation of paradox-breaker RAF inhibitors as a second-line treatment option for patients failing on vemurafenib or dabrafenib.

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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
Drug Name Trade Name Synonyms Drug Classes Drug Description
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 act mut Advanced Solid Tumor sensitive PLX8394 Preclinical Actionable In a preclinical study, PLX8394 had been shown to block survival and growth of vemurafenib/PLX4720-resistant cells harboring distinct BRAF activating mutations (PMID: 24422853). 24422853
BRAF mutant melanoma sensitive PLX8394 Preclinical Actionable In a preclinical study, PLX8394 blocked survival and growth of vemurafenib/PLX4720-resistant melanoma cells harboring BRAF V600E splice variants in culture (PMID: 24422853). 24422853
BRAF V600E Advanced Solid Tumor sensitive PLX8394 Preclinical Actionable In a preclinical study, PLX8394 had been shown to block survival and growth of vemurafenib/PLX4720-resistant cells harboring distinct BRAF V600E splice variants (PMID: 24422853). 24422853