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Ref Type Journal Article
PMID (30341394)
Authors Caeser R, Collord G, Yao WQ, Chen Z, Vassiliou GS, Beer PA, Du MQ, Scott MA, Follows GA, Hodson DJ
Title Targeting MEK in vemurafenib-resistant hairy cell leukemia.
Journal Vol Issue Date Pages Journal Short Title
Leukemia 2018 Oct 19 541-545 Leukemia
URL
Abstract Text

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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
MAP2K1 F53C missense gain of function MAP2K1 F53C lies within the negative regulatory region of the Map2k1 protein (PMID: 24241536). F53C confers a gain of function to Map2k1 as demonstrated by increased Erk1/2 phosphorylation (PMID: 30341394) and transformation activity in cultured cells and increased proliferation in a competition assay (PMID: 36442478), and is associated with resistance to BRAF inhibitors (PMID: 30341394, PMID: 36442478). Y
MAP2K1 K57T missense gain of function MAP2K1 K57T lies within the negative regulatory region of the Map2k1 protein (PMID: 24241536). K57T confers a gain of function to Map2k1 as demonstrated by increased Erk1/2 phosphorylation (PMID: 30341394, PMID: 32641410) and transformation activity in cultured cells and increased proliferation in a competition assay (PMID: 36442478), and occurs as a secondary drug resistance mutation in the context of BRAF inhibitors (PMID: 26644315, PMID: 28819429, PMID: 30341394). Y
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
BRAF V600E MAP2K1 K57T hairy cell leukemia predicted - resistant Vemurafenib Case Reports/Case Series Actionable In a clinical case study, a single patient with hairy cell leukemia harboring BRAF V600E, who relapsed after a 38 week remission in response to Zelboraf (vemurafenib) treatment, was found to have acquired multiple clones with Mek/Erk activating mutations, of which the MAP2K1 K57T clone became dominant (PMID: 30341394). 30341394
MAP2K1 F53C lymphoma predicted - resistant Vemurafenib Preclinical - Cell culture Actionable In a preclinical study, expression of MAP2K1 F53C in a lymphoma cell line conferred resistance to inhibition of Erk phosphorylation by Zelboraf (vemurafenib) in culture (PMID: 30341394). 30341394
BRAF V600E MAP2K1 K57T refractory hairy cell leukemia predicted - sensitive Cobimetinib + Vemurafenib Case Reports/Case Series Actionable In a clinical case study, a patient with hairy cell leukemia harboring BRAF V600E who relapsed after initial response to Zelboraf (vemurafenib) and was found to have acquired multiple clones with Mek/Erk activating mutations, including MAP2K1 K57T, demonstrated a sustained response greater than 12 months to combined Zelboraf (vemurafenib) and Cotellic (cobimetinib) treatment (PMID: 30341394). 30341394