Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Predominance of MAPK reactivation in early resistance to debrafenib/trametinib combination therapy of BRAF mutant metastatic melanoma.

ABSTRACT: One third of BRAF-mutant metastatic melanoma patients treated with combined BRAF and MEK inhibition progress within six months. Treatment options for these patients remain limited. Here we analyse twenty BRAFV600 mutant melanoma metastases derived from 10 patients treated with the combination of debrafenib and trametinib for resistance mechanisms and genetic correlates of response. Resistance mechanisms are identified in 9/11 progressing tumors and MAPK reactivation occurred in 9/10 tumors, commonly via BRAF amplification and mutations activating NRAS and MEK2. Our data confirming that MEK2C125S, but not the synonymous MEK1C121S 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 (e.g. RCA1 and AKT3) that activate the MAPK and P13K pathways and are thus predicted to diminish response to MAPK inhibitors. Total RNA obtained from fresh frozen melanoma tumors treated with a combination of dabrafenib and trametinib

ORGANISM(S): Homo sapiens

SUBMITTER: Gulietta Pupo

PROVIDER: E-GEOD-61992 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Increased MAPK reactivation in early resistance to dabrafenib/trametinib combination therapy of BRAF-mutant metastatic melanoma.

Long Georgina V GV Fung Carina C Menzies Alexander M AM Pupo Gulietta M GM Carlino Matteo S MS Hyman Jessica J Shahheydari Hamideh H Tembe Varsha V Thompson John F JF Saw Robyn P RP Howle Julie J Hayward Nicholas K NK Johansson Peter P Scolyer Richard A RA Kefford Richard F RF Rizos Helen H

Nature communications 20141202

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, common ...[more]

PMID: 25452114

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Dataset Information

Predominance of MAPK reactivation in early resistance to debrafenib/trametinib combination therapy of BRAF mutant metastatic melanoma.

Publications

Increased MAPK reactivation in early resistance to dabrafenib/trametinib combination therapy of BRAF-mutant metastatic melanoma.

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