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Long, Georgina V; Fung, Carina; Menzies, Alexander M; Pupo, Gulietta M; Carlino, Matteo S; Hyman, Jessica; Shahheydari, Hamideh; Tembe, Varsha; Thompson, John F; Saw, Robyn P; Howle, Julie; Hayward, Nicholas K; Johansson, Peter; Scolyer, Richard A; Kefford, Richard F; Rizos, Helen
Nature communications, 2014-Dec-02, Letnik: 5, Številka: 1Journal Article
One-third of BRAF-mutant metastatic melanoma patients treated with combined BRAF and MEK inhibition progress within 6 months. Treatment options for these patients remain limited. Here we analyse 20 BRAF(V600)-mutant melanoma metastases derived from 10 patients treated with the combination of dabrafenib and trametinib for resistance mechanisms and genetic correlates of response. Resistance mechanisms are identified in 9/11 progressing tumours and MAPK reactivation occurred in 9/10 tumours, commonly via BRAF amplification and mutations activating NRAS and MEK2. Our data confirming that MEK2(C125S), but not the synonymous MEK1(C121S) protein, confers resistance to combination therapy highlight the functional differences between these kinases and the preponderance of MEK2 mutations in combination therapy-resistant melanomas. Exome sequencing did not identify additional progression-specific resistance candidates. Nevertheless, most melanomas carried additional oncogenic mutations at baseline (for example, RAC1 and AKT3) that activate the MAPK and PI3K pathways and are thus predicted to diminish response to MAPK inhibitors.
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in: SICRIS
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