Cobimetinib

Cobimetinib (trade name Cotellic) is a MEK inhibitor developed by Exelixis and Genentech (Roche). It is used in combination with vemurafenib, a BRAF inhibitor, to treat melanoma. In November 2015, the U.S. Food and Drug Administration approved cobimetinib for unresectable or metastatic melanoma with a BRAF V600E or V600K mutation, in combination with vemurafenib (Zelboraf). Cobimetinib is not indicated for treatment of patients with wild-type BRAF melanoma.[4]

Cobimetinib
Clinical data
Pronunciation/ˌkoʊbɪˈmɛtɪnɪb/ KOH-bim-ET-i-nib
Trade namesCotellic
Other namesGDC-0973, XL-518
AHFS/Drugs.comMonograph
MedlinePlusa615057
License data
Pregnancy
category
  • AU: D
    Routes of
    administration    		By mouth (tablets)[1]
    ATC code
    Legal status
    Legal status
    • AU: S4 (Prescription only)
    • CA: ℞-only
    • UK: POM (Prescription only)
    • US: ℞-only
    • In general: ℞ (Prescription only)
    Pharmacokinetic data
    Bioavailabilityreported from 28%[2] to 46%[1]
    Protein binding95%[1]
    MetabolismIntestinal and low hepatic clearance (mostly CYP3A4 oxidation and UGT2B7 glucuronidation)[1][2]
    Elimination half-life44 hours (mean)[1]
    ExcretionFeces (76–77%), urine (17.9–18%) (after oral and IV administration)[1][3]
    Identifiers
    CAS Number
    PubChem CID
    IUPHAR/BPS
    DrugBank
    ChemSpider
    UNII
    KEGG
    ChEBI
    ChEMBL
    CompTox Dashboard (EPA)
    Chemical and physical data
    FormulaC21H21F3IN3O2
    Molar mass531.3 g/mol g·mol−1
    3D model (JSmol)

    Cobimetinib in combination with vemurafenib is priced at $17,600 per month, or about $211,000 per year.[5]

    Medical use

    Cobimetinib is approved for use in combination with vemurafenib (Zelboraf) for the treatment of advanced melanoma with BRAF mutation (either V600E or V600K) that cannot be removed by surgery or which has metastasized.[1][6]

    Adverse effects

    Common adverse effects observed in cobimetinib and vemurafenib co-treated persons in clinical trials included diarrhea, nausea, vomiting, rash, photosensitivity, and pyrexia.[7]

    History

    Cobimetinib was awarded orphan drug status by the FDA for malignant melanoma with BRAFV600 mutation in 2014.

    Acquired resistance to BRAF inhibitors, such as vemurafenib and dabrafenib, commonly occurs after a several months of progression-free tumor response. Preclinical data indicated the involvement of MAPK pathways and MAPK-independent signaling in the developed resistance, suggesting dual inhibition of MEK and BRAF kinase as a strategy for increasing the longevity of tumor response seen with BRAF inhibition alone.

    In phase III clinical trials, the combination of cobimetinib and vemurafenib was tested in patients with BRAFV600-mutated metastatic melanoma, which resulted in significant improvement in progression-free survival in patients, but also produced some increase in toxicity. The combination increased progression-free survival to an average of 12.3 months, compared to 7.2 months for vemurafenib alone. This clinical data also showed that the combination treatment resulted in 65% survival rate of patients 17 months after beginning the treatment, increased rates from the 50% of patients on vemurafenib treatment alone. Adding cobimetinib also increased the median overall survival to 25.6 months, compared to the 18 months for vemurafenib alone.[5][7]

    References
    1. "Cotellic (cobimetinib) Tablets, for Oral Use. Full Prescribing Information" (PDF). Genentech USA, Inc., a Member of the Roche Group. 1 DNA Way, South San Francisco, CA 94080-4990. Retrieved 5 October 2016.
    2. Takahashi, RH; Choo, EF; Ma, S; Wong, S; Halladay, J; Deng, Y; Rooney, I; Gates, M; Hop, CE; Khojasteh, SC; Dresser, MJ; Musib, L (January 2016). "Absorption, Metabolism, Excretion, and the Contribution of Intestinal Metabolism to the Oral Disposition of [14C]Cobimetinib, a MEK Inhibitor, in Humans". Drug Metabolism and Disposition. 44 (1): 28–39. doi:10.1124/dmd.115.066282. PMID 26451002.
    3. Choo, E; Takahashi, R; Rooney, I; Gates, M; Deng, A; Musib, L (January 30, 2014). "Abstract B160: Assessing Human Absorption, Metabolism, Routes of Excretion and the Contribution of Intestinal Metabolism to the Oral Clearance of Cobimetinib, a MEK Inhibitor". Molecular Cancer Therapeutics. 12 (11 Supplement): B160. doi:10.1158/1535-7163.TARG-13-B160.
    4. "Archived copy". Archived from the original on 2015-11-17. Retrieved 2015-11-16.CS1 maint: archived copy as title (link)
    5. Staton, Tracy (11 November 2015). "Ready to rumble, Novartis? Roche targets melanoma-fighting combo market with new FDA nod". FiercePharma. FierceMarkets. Questex. Retrieved 2 December 2015.
    6. "FDA approves Cotellic as part of combination treatment for advanced melanoma". U.S. Food and Drug Administration. 10 November 2015. Retrieved 2 December 2015.
    7. Larkin, James; Ascierto, Paolo A.; Dréno, Brigitte; Atkinson, Victoria; et al. (2014). "Combined Vemurafenib and Cobimetinib inBRAF-Mutated Melanoma" (PDF). New England Journal of Medicine. 371 (20): 1867–1876. doi:10.1056/NEJMoa1408868. ISSN 0028-4793. PMID 25265494.
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