Reference Detail

Ref Type

Journal Article

PMID

(33560788)

Authors

Lobo-Martins S, Pais HL, Soares-de-Almeida L, Costa L, Mansinho A, Teixeira de Sousa R

Title

BRAF L597K mutation: an opportunity to treat.

Journal	Vol	Issue	Date	Pages	Journal Short Title
Dermatology online journal	27	1	2021 Jan 15		Dermatol Online J

URL

Abstract Text

The outcomes of patients with metastatic melanoma (MM) have significantly improved after the introduction of BRAF-specific inhibitors. Herein is reported a patient with MM and non-V600-BRAF mutation who responded to iBRAF/iMEK therapy. In July 2014, a 63-year-old man presented with a 4.1mm-thick V600E-BRAF wild type melanoma on the back. Metastases were identified in one sentinel node and two of 11 subsequently excised lymph nodes, with no signs of distant metastatic disease. In September 2017, lung metastasis was observed and pembrolizumab was started. Progressive disease was apparent at cycle 10 and therapy was switched to ipilimumab. After four cycles, an asymmetric response was observed. In November 2017, next generation sequencing genomic profiling disclosed a rare L597K-BRAF mutation and vemurafenib plus cobimetinib therapy was initiated in January 2018. Seven days after treatment start, a remarkable clinical improvement was observed. In April 2018, the patient achieved partial response, which was sustained until October 2018. Cases of patients with non-V600-BRAF mutations responding to iBRAF/iMEK therapy have been reported over the last years. To the best of our knowledge, this is the first case reporting response to combined iBRAF/iMEK therapy in a patient with metastatic melanoma harboring L597K mutation.

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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
BRAF	L597K	missense	unknown	BRAF L597K lies within the protein kinase domain of the Braf protein (UniProt.org). L597K has been identified in the scientific literature (PMID: 33560788), but has not been biochemically characterized and therefore, its effect on Braf protein function is unknown (PubMed, May 2024).

Molecular Profile	Indication/Tumor Type	Response Type	Therapy Name	Approval Status	Evidence Type	Efficacy Evidence	References
BRAF L597K	melanoma	predicted - sensitive	Cobimetinib + Vemurafenib	Case Reports/Case Series	Actionable	In a clinical case study, the combination of Cotellic (cobimetinib) and Zelboraf (vemurafenib) resulted in a partial response and clinical improvement in a patient with metastatic melanoma harboring BRAF L597K (PMID: 33560788).	33560788