BRAF and NRAS Mutations are Heterogeneous and Not Mutually Exclusive in Nodular Melanoma
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چکیده
منابع مشابه
BRAF and NRAS Mutations are Heterogeneous and Not Mutually Exclusive in Nodular Melanoma
Inhibitors of RAF inhibit the MAPK pathway that plays an important role in the development and progression of those melanoma carrying the V600E BRAF mutation, but there's a subset of such patients who do not respond to the therapy. Various mechanisms of drug resistance have been proposed which include the clonal heterogeneity of the tumor. We have studied a population of nodular melanoma to inv...
متن کاملAbsence of BRAF and NRAS mutations in uveal melanoma.
Uveal melanoma (UM) and cutaneous melanoma (CM) differ significantly in their epidemiological, clinical, immunophenotypical, and cytogenetic features, but the molecular basis for these differences has not been delineated. CMs frequently harbor an activating mutation in either NRAS or the RAS-regulated kinase BRAF, suggesting that either of these oncogenes may increase signaling through the mito...
متن کاملMalignant Melanoma with Concurrent BRAF E586K and NRAS Q81K Mutations
Cutaneous melanoma is an aggressive malignant tumor of melanocytes which accounts for 80% of skin cancer-related deaths. A number of driver mutations have been identified in melanoma, with the mutually exclusive BRAF V600E and NRAS Q61A mutations together accounting for roughly 70% of mutations. Simultaneous BRAF V600E and NRAS Q61A mutations in melanoma are rare, with evidence suggesting that ...
متن کاملNRAS and BRAF mutations arise early during melanoma pathogenesis and are preserved throughout tumor progression.
PURPOSE Recently, it was reported that BRAF mutations are frequent in melanoma. Previously, we analyzed a large series of paired primary and metastatic melanomas for NRAS codon 61 mutations and showed that they arise early and are preserved during tumor progression. Here, we have screened the same tumor samples for BRAF mutations. EXPERIMENTAL DESIGN Primary melanomas (n = 71) and correspondi...
متن کاملNRAS and BRAF Mutations in Melanoma-Associated Nevi and Uninvolved Nevi
According to the prevailing multistep model of melanoma development, oncogenic BRAF or NRAS mutations are crucial initial events in melanoma development. It is not known whether melanocytic nevi that are found in association with a melanoma are more likely to carry BRAF or NRAS mutations than uninvolved nevi. By laser microdissection we were able to selectively dissect and genotype cells either...
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ژورنال
عنوان ژورنال: Applied Immunohistochemistry & Molecular Morphology
سال: 2015
ISSN: 1541-2016
DOI: 10.1097/pai.0000000000000071