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Cobimetinib is a member of the class of N-acylazetidines obtained by selective formal condensation of the carboxy group of 3,4-difluoro-2-(2-fluoro-4-iodoanilino)benzoic acid with the secondary amino group from the azetidine ring of 3-[(2S)-piperidin-2-yl]azetidin-3-ol. An inhibitor of mitogen-activated protein kinase that is used (as its fumarate salt) in combination with vemurafenib for the treatment of patients with unresectable or metastatic melanoma. It has a role as an EC 2.7.11.24 (mitogen-activated protein kinase) inhibitor and an antineoplastic agent. It is a member of piperidines, a N-acylazetidine, a tertiary alcohol, an aromatic amine, a secondary amino compound, a difluorobenzene and an organoiodine compound. It is a conjugate base of a cobimetinib(1+).|Cobimetinib is an orally active, potent and highly selective small molecule inhibiting mitogen-activated protein kinase kinase 1 (MAP2K1 or MEK1), and central components of the RAS/RAF/MEK/ERK signal transduction pathway. It has been approved in Switzerland and the US, in combination with vemurafenib for the treatment of patients with unresectable or metastatic BRAF V600 mutation-positive melanoma.|Cobimetinib is a Kinase Inhibitor. The mechanism of action of cobimetinib is as a Kinase Inhibitor.|Cobimetinib is a tyrosine kinase receptor inhibitor that is used in combination with vemurafenib as therapy for selected forms of advanced malignant melanoma. The combination of cobimetinib and vemurafenib is commonly associated with serum enzyme elevations during therapy and to rare instances of clinically apparent acute liver injury.|Cobimetinib is an orally bioavailable small-molecule inhibitor of mitogen-activated protein kinase kinase 1 (MAP2K1 or MEK1), with potential antineoplastic activity. Cobimetinib specifically binds to and inhibits the catalytic activity of MEK1, resulting in inhibition of extracellular signal-related kinase 2 (ERK2) phosphorylation and activation and decreased tumor cell proliferation. Preclinical studies have demonstrated that this agent is effective in inhibiting the growth of tumor cells bearing a B-RAF mutation, which has been found to be associated with many tumor types. A threonine-tyrosine kinase and a key component of the RAS/RAF/MEK/ERK signaling pathway that is frequently activated in human tumors, MEK1 is required for the transmission of growth-promoting signals from numerous receptor tyrosine kinases.