Class/mechanism: Reversible MEK1 (mitogen-activated extracellular signal regulated kinase 1) and MEK2 kinase inhibitor. MEK proteins are upstream and affect cellular proliferation by modulating the activity of the ERK (extracellular signal-related kinase) pathway. BRAF V600E mutations constitutively activate the BRAF pathway, which includes MEK1 and MEK2. By inhibiting MEK1 and MEK2, trametinib inhibits tumor cell growth that would otherwise be stimulated by constitutive activation from certain BRAF mutations.
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Diseases for which it is used
- BRAF-mutated melanoma
- BRAF-mutated NSCLC
- BRAF-mutated anaplastic thyroid cancer
- BRAF-mutated tumors (disease-agnostic)
Patient drug information
History of changes in FDA indication
- 5/29/2013: FDA approved for the treatment of patients with unresectable or metastatic melanoma with BRAF V600E or V600K mutations as detected by an FDA-approved test. 
- 1/10/2014: FDA approved in combination with Dabrafenib (Tafinlar) "for the treatment of patients with unresectable or metastatic melanoma with BRAF V600E or V600K mutations as detected by an FDA-approved test. 
- 6/22/2017: FDA approved in combination with Dabrafenib (Tafinlar) for patients with metastatic non-small cell lung cancer (NSCLC) with BRAF V600E mutation as detected by an FDA-approved test.
- 4/30/2018: Regular FDA approval with Dabrafenib (Tafinlar) in combination for the adjuvant treatment of patients with melanoma with BRAF V600E or V600K mutations, as detected by an FDA-approved test, and involvement of lymph node(s), following complete resection.
- 5/4/2018: FDA approval with Dabrafenib (Tafinlar) in combination for the treatment of patients with locally advanced or metastatic anaplastic thyroid cancer (ATC) with BRAF V600E mutation and with no satisfactory locoregional treatment options.
Also known as
- Code names: GSK-1120212, GSK1120212, JTP-74057
- Generic name: trametinib dimethyl sulfoxide
- Brand name: Mekinist