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|Ref Type||Journal Article|
|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|
|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.|
|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 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 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|