Reference Detail

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	Vol	Issue	Date	Pages	Journal Short Title
Pigment cell & melanoma research	27	3	2014 May	479-84	Pigment Cell Melanoma Res

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 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
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