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Ref Type | Journal Article | ||||||||||||
PMID | (28344857) | ||||||||||||
Authors | Marconcini R, Galli L, Antonuzzo A, Bursi S, Roncella C, Fontanini G, Sensi E, Falcone A | ||||||||||||
Title | Metastatic BRAF K601E-mutated melanoma reaches complete response to MEK inhibitor trametinib administered for over 36 months. | ||||||||||||
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Abstract Text | The BRAF K601E mutation occurs in 5% of patients with melanoma, and is the third most common type of BRAF mutation. However, treatment with BRAF and mitogen-activated extracellular signal-regulated kinase (MEK) inhibitors is only approved in patients with BRAF V600-positive melanoma, and patients with K601E-mutated melanoma do not have access to such drugs.A female patient was diagnosed with high tumor burden metastatic melanoma harboring the BRAF K601E mutation. After chemotherapy failure, she underwent compassionate treatment with trametinib. Trametinib showed good activity and efficacy, with 48% shrinkage of a metastatic lymphadenopathy after 4 months' treatment. However, the patient reported treatment-related skin toxicity that required dosage reduction and a personalized intermittent trametinib dosing schedule. After over 36 months from the first trametinib administration, and resection of a metastatic lymphadenopathy, the patient experienced complete response.This case report shows that trametinib could be a valid therapeutic option in patients with metastatic melanoma harboring the rare BRAF K601E mutation. |
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Gene | Variant | Impact | Protein Effect | Variant Description | Associated with drug Resistance |
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Molecular Profile | Indication/Tumor Type | Response Type | Therapy Name | Approval Status | Evidence Type | Efficacy Evidence | References |
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BRAF K601E | melanoma | predicted - sensitive | Trametinib | Case Reports/Case Series | Actionable | In a clinical case study, a melanoma patient harboring BRAF K601E demonstrated a 48% reduction in lymphadenopathy when treated with Mekinist (trametinib) and after more than 36 months of treatment showed a complete response (PMID: 28344857). | 28344857 |