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|Ref Type||Journal Article|
|Authors||Whittaker SR, Cowley GS, Wagner S, Luo F, Root DE, Garraway LA|
|Title||Combined Pan-RAF and MEK Inhibition Overcomes Multiple Resistance Mechanisms to Selective RAF Inhibitors.|
|Journal||Molecular cancer therapeutics|
|Abstract Text||RAF and MEK inhibitors are effective in BRAF-mutant melanoma but not in BRAF-mutant colorectal cancer. To gain additional insights into this difference, we performed a genome-scale pooled shRNA enhancer screen in a BRAF-mutant, RAF inhibitor-resistant colorectal cancer cell line exposed to the selective RAF inhibitor PLX4720. We identified multiple genes along the receptor tyrosine kinase (RTK)/mitogen-activated protein kinase (MAPK) signaling axis that, when suppressed, either genetically or pharmacologically, sensitized cells to the selective RAF inhibitor through sustained inhibition of MAPK signaling. Strikingly, CRAF was a key mediator of resistance that could be overcome by the use of pan-RAF inhibitors in combination with a MEK inhibitor. Furthermore, the combination of pan-RAF and MEK inhibitors displayed strong synergy in melanoma and colorectal cancer cell lines with RAS-activating events such as RTK activation, KRAS mutation, or NF1 loss-of-function mutations. Combinations of selective RAF inhibitors, such as PLX4720 or dabrafenib, with MEK inhibitors did not incur such profound synergy, suggesting that inhibition of CRAF by pan-RAF inhibitors plays a key role in determining cellular response. Importantly, in contrast to the modest activity seen with single-agent treatment, dual pan-RAF and MEK inhibition results in the induction of apoptosis, greatly enhancing efficacy. Notably, combined pan-RAF and MEK inhibition can overcome intrinsic and acquired resistance to single-agent RAF/MEK inhibition, supporting dual pan-RAF and MEK inhibition as a novel therapeutic strategy for BRAF- and KRAS-mutant cancers.|
|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 mutant||colorectal cancer||sensitive||AZ628 + Selumetinib||Preclinical - Cell culture||Actionable||In a preclinical study, Koselugo (selumetinib) and AZ628 synergistically inhibited Mapk signaling and cell proliferation in BRAF mutant colorectal cancer cell lines in culture (PMID: 26351322).||26351322|
|BRAF mutant||colorectal cancer||decreased response||PLX4720||Preclinical - Cell culture||Actionable||In a preclinical study, BRAF mutant colorectal cancer cell lines demonstrated reduced sensitivity to PLX4720 in culture (PMID: 26351322).||26351322|
|BRAF mut PTPN11 dec exp||colorectal cancer||sensitive||PLX4720||Preclinical - Cell culture||Actionable||In a preclinical study, knocking down of Ptpn11 expression via shRNA sensitized BRAF mutant colorectal cancer cell lines to PLX4720 in culture (PMID: 26351322).||26351322|