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Dabrafenib in patients with melanoma, untreated brain metastases, and other solid tumours: a phase 1 dose-escalation trial

Open access
Falchook, Gerald S, Long, Georgina V, Kurzrock, Razelle, Kim, Kevin B, Arkenau, Tobias H, Brown, Michael P, Hamid, Omid, Infante, Jeffrey R, Millward, Michael, Pavlick, Anna C, O’Day, Steven J, Blackman, Samuel C, Curtis, C Martin, Lebowitz, Peter, Ma, Bo, Ouellet, Daniele, Kefford, Richard F·2012·The Lancet

Abstract

Background Dabrafenib (GSK2118436) is a potent ATP-competitive inhibitor of BRAF kinase and was highly selective for mutant BRAF in kinase panel screening, cell lines, and xenografts. Methods A Phase I trial of dabrafenib was conducted to evaluate safety and tolerability in patients with incurable solid tumours. Efficacy at the recommended Phase II dose (RP2D) was studied in patients with BRAF-mutant tumours, including those with non-V600E mutations, in three cohorts: (1) metastatic melanoma, (2) melanoma with untreated brain metastases, and (3) non-melanoma solid tumours. Findings 184 patients enrolled, and 150 mg twice daily was chosen as the RP2D, based on safety, pharmacokinetic, and pharmacodynamic data. At the RP2D in patients with V600 BRAF-mutant melanoma, a response rate of 69% (a confirmed response rate of 50%) was observed overall and a 78% response rate (a confirmed response rate of 56%) in V600E BRAF-mutant melanoma. In V600 BRAF-mutant melanoma, responses were durable, with 17 patients (47%) on treatment for more than 6 months and a median progression-free survival (PFS) of 5·5 months. Responses were observed in patients with non-V600E BRAF mutations, including V600K and V600G. In the RP2D expansion of melanoma with untreated brain metastases, nine of ten patients (90%) showed reduction in brain lesion size and the median PFS was 4.2 months. Among BRAF-mutant non-melanoma solid tumours, antitumour activity was observed in gastrointestinal stromal tumour, papillary thyroid, non-small cell lung, ovarian, and colorectal cancer. Interpretation Dabrafenib is a highly active inhibitor of V600-mutant BRAF with a high response rate in V600E melanoma, and is the first drug of its class to demonstrate activity in melanoma brain metastases. Funding This study was funded and sponsored by GlaxoSmithKline

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Metadata

Authors
Falchook, G. S., Long, G. V., Kurzrock, R., Kim, K. B., Arkenau, T. H., Brown, M. P., Hamid, O., Infante, J. R., Millward, M., Pavlick, A. C., O’Day, S. J., Blackman, S. C., Curtis, C. M., Lebowitz, P., Ma, B., Ouellet, D., & Kefford, R. F.
Venue
The Lancet
Publisher
Elsevier BV
Published
2012-05
Volume
379
Issue
9829
Pages
1893-1901
ISSN
  • 0099-5355 (ISSN-L)
  • 0140-6736
OpenAlex
W2106494998
Cited by
943
References
9
FWCI
50.53
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: Dabrafenib in patients with melanoma, untreated brain metastases, and other solid tumours: a phase 1 dose-escalation trial. https://app.cochat.ai/papers/10.1016/s0140-6736(12)60398-5
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Falchook, G. S., Long, G. V., Kurzrock, R., Kim, K. B., Arkenau, T. H., Brown, M. P., Hamid, O., Infante, J. R., Millward, M., Pavlick, A. C., O’Day, S. J., Blackman, S. C., Curtis, C. M., Lebowitz, P., Ma, B., Ouellet, D., & Kefford, R. F. (2012). Dabrafenib in patients with melanoma, untreated brain metastases, and other solid tumours: a phase 1 dose-escalation trial. The Lancet. https://doi.org/10.1016/s0140-6736(12)60398-5

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

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