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Ref Type Journal Article
PMID (29632053)
Authors Schreck KC, Guajardo A, Lin DDM, Eberhart CG, Grossman SA
Title Concurrent BRAF/MEK Inhibitors in BRAF V600-Mutant High-Grade Primary Brain Tumors.
Abstract Text BRAF V600 mutations are being identified in patients with primary brain tumors more often as molecular testing becomes widely available. Targeted treatment with BRAF inhibitors has been attempted in individual cases with some responses, whereas others showed no response or developed resistance. Preclinical work suggests that gliomas could be more responsive to the concurrent use of BRAF and MEK inhibition for MAP kinase pathway suppression. This report presents 2 cases of malignant brain tumors with BRAF V600E mutations that were resistant to radiation and temozolomide, and reports on their response to targeted treatment with the BRAF and MEK inhibitors dabrafenib and trametinib. One patient with an anaplastic pleomorphic xanthoastrocytoma experienced a partial response for 14 months, demonstrated by progressive tumor shrinkage and clinical improvement; however, this was followed by clinical and radiographic progression. The patient with glioblastoma continued to have stable disease after 16 months of treatment. These cases are encouraging in a disease that urgently needs new treatments. Further work is necessary to understand response rates, duration, and survival in primary brain tumors.


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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 pleomorphic xanthoastrocytoma sensitive Dabrafenib + Trametinib Case Reports/Case Series Actionable In a clinical case study, Mekinist (trametinib) and Tafinlar (dabrafenib) combination treatment resulted in clinical benefit that lasted for more than 14 months in a patient with pleomorphic xanthoastrocytoma harboring BRAF V600E (PMID: 29632053). 29632053
BRAF V600E glioblastoma sensitive Dabrafenib + Trametinib Case Reports/Case Series Actionable In a clinical case study, an epithelioid glioblastoma patient harboring BRAF V600E treated with Mekinist (trametinib) and Tafinlar (dabrafenib) combination therapy resulted in stable disease, and the patient continued to demonstrate stable disease at least 16 months after initiation of therapy (PMID: 29632053). 29632053