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B-Raf is a 766-amino acid, regulated signal transduction serine/threonine-specific protein kinase.Broadly speaking, it is composed of three conserved domains characteristic of the Raf kinase family: conserved region 1 (CR1), a Ras-GTP-binding [11] self-regulatory domain, conserved region 2 (CR2), a serine-rich hinge region, and conserved region 3 (CR3), a catalytic protein kinase domain that ...
V600E is a mutation of the BRAF gene in which valine (V) is substituted by glutamic acid (E) at amino acid 600. [1] [2] It is a driver mutation in a proportion of certain diagnoses, including melanoma, [3] [4] hairy cell leukemia, [5] [6] papillary thyroid carcinoma, [7] [8] colorectal cancer, [9] non-small-cell lung cancer, [10] [11] Langerhans cell histiocytosis, [12] Erdheim–Chester ...
An activating somatic mutation of a proto-oncogene in the Raf family, the BRAF gene, was detected in 35 of 61 (57%) LCH biopsy samples with mutations being more common in patients younger than 10 years (76%) than in patients aged 10 years and older (44%). [31] This study documented the first recurrent mutation in LCH samples.
After performing a multivariate analysis, it was found that the absence of tumor capsule was the only parameter associated (P=0.0005) with BRAF V600E mutation. [5] According to recent studies, papillary cancers carrying the common V600E mutation tend to have a more aggressive long-term course.
Vemurafenib only works in melanoma patients whose cancer has a V600E BRAF mutation (that is, at amino acid position number 600 on the B-Raf protein, the normal valine is replaced by glutamic acid). [4] About 60% of melanomas have this mutation. It also has efficacy against the rarer V600K BRAF (the normal valine is replaced by lysine) mutation ...
In June 2018, the FDA approved the combination of a BRAF inhibitor encorafenib and a MEK inhibitor binimetinib for the treatment of un-resectable or metastatic melanoma with a BRAF V600E or V600K mutation. [186] Eventual resistance to BRAF and MEK inhibitors may be due to a cell surface protein known as EphA2 which is now being investigated. [187]
Cobimetinib or XL518, approved by US FDA in Nov 2015 for use in combination with vemurafenib (Zelboraf(R)), for treatment of advanced melanoma with a BRAF V600E or V600K mutation. Selumetinib , had a phase 2 clinical trial for non-small cell lung cancer (NSCLC) which demonstrated an improvement in PFS, [ 5 ] and is now in phase III development ...
Mutations found in ovarian cancer subtypes [28] [31] [55] Gene mutated Mutation type Subtype Prevalence AKT1: amplification 3% AKT2: amplification/mutation 6%, [28] 20% [55] ARID1A: point mutation endometrioid and clear-cell BECN1: deletion BRAF: point mutation low-grade serous 0.5% BRCA1: nonsense mutation high-grade serous 5% BRCA2 ...
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