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Ref Type Journal Article
PMID (25515853)
Authors Hoogstraat M, Gadellaa-van Hooijdonk CG, Ubink I, Besselink NJ, Pieterse M, Veldhuis W, van Stralen M, Meijer EF, Willems SM, Hadders MA, Kuilman T, Krijgsman O, Peeper DS, Koudijs MJ, Cuppen E, Voest EE, Lolkema MP
Title Detailed imaging and genetic analysis reveal a secondary BRAF(L505H) resistance mutation and extensive intrapatient heterogeneity in metastatic BRAF mutant melanoma patients treated with vemurafenib.
Journal Vol Issue Date Pages Journal Short Title
Pigment cell & melanoma research 28 3 2015 May 318-23 Pigment Cell Melanoma Res
URL
Abstract Text Resistance to treatment is the main problem of targeted treatment for cancer. We followed ten patients during treatment with vemurafenib, by three-dimensional imaging. In all patients, only a subset of lesions progressed. Next-generation DNA sequencing was performed on sequential biopsies in four patients to uncover mechanisms of resistance. In two patients, we identified mutations that explained resistance to vemurafenib; one of these patients had a secondary BRAF L505H mutation. This is the first observation of a secondary BRAF mutation in a vemurafenib-resistant patient-derived melanoma sample, which confirms the potential importance of the BRAF L505H mutation in the development of therapy resistance. Moreover, this study hints toward an important role for tumor heterogeneity in determining the outcome of targeted treatments.

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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 L505H BRAF V600E melanoma predicted - resistant Vemurafenib Case Reports/Case Series Actionable In a clinical case study, a melanoma patient harboring BRAF V600E treated with Zelboraf (vemurafenib) subsequently demonstrated resistance likely due to the secondary resistance mutation, BRAF L505H (PMID: 25515853). 25515853