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Ref Type Journal Article
PMID (35385748)
Authors Rajkumar S, Berry D, Heney KA, Strong C, Ramsay L, Lajoie M, Alkallas R, Nguyen TT, Thomson C, Ahanfeshar-Adams M, Dankner M, Petrella T, Rose AAN, Siegel PM, Watson IR
Title Melanomas with concurrent BRAF non-p.V600 and NF1 loss-of-function mutations are targetable by BRAF/MEK inhibitor combination therapy.
Journal Cell reports
Vol 39
Issue 1
Date 2022 04 05
URL
Abstract Text Although combination BRAF/MEK inhibition has produced significant survival benefits for BRAF p.V600 mutant melanomas, targeted therapies approved for BRAF non-p.V600 mutant melanomas remain limited. Through the analysis of 772 cutaneous melanoma exomes, we reveal that BRAF non-p.V600 mutations co-occurs more frequently with NF1 loss, but not with oncogenic NRAS mutations, than expected by chance. We present cell signaling data, which demonstrate that BRAF non-p.V600 mutants can signal as monomers and dimers within an NF1 loss context. Concordantly, BRAF inhibitors that inhibit both monomeric and dimeric BRAF synergize with MEK inhibition to significantly reduce cell viability in vitro and tumor growth in vivo in BRAF non-p.V600 mutant melanomas with co-occurring NF1 loss-of-function mutations. Our data suggest that patients harboring BRAF non-p.V600 mutant melanomas may benefit from current FDA-approved BRAF/MEK inhibitor combination therapy currently reserved for BRAF p.V600 mutant patients.

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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 D594G NRAS G12D melanoma sensitive Binimetinib + Encorafenib Preclinical - Cell culture Actionable In a preclinical study, the combination of Mektovi (binimetinib) and Braftovi (encorafenib) resulted in a synergistic effect in melanoma cells harboring BRAF D594G and NRAS G12D, with decreased cell viability and Erk phosphorylation and increased apoptosis in culture (PMID: 35385748). 35385748