Vemurafenib

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Vemurafenib
Clinical data
Pronunciation/ˌvɛməˈræfənɪb/ VEM-ə-RAF-ə-nib
Trade namesZelboraf
Other namesPLX4032, RG7204, PLX4720, RO5185426
AHFS/Drugs.comMonograph
MedlinePlusa612009
License data
Pregnancy
category
Routes of
administration		By mouth
ATC code
Legal status
Legal status
Identifiers
  • N-(3-{[5-(4-Chlorophenyl)-1H-pyrrolo[2,3-b]pyridin-3-yl]carbonyl}-2,4-difluorophenyl)propane-1-sulfonamide
JSmol)
  • CCCS(=O)(=O)Nc1ccc(F)c(c1F)C(=O)c2c[nH]c3c2cc(cn3)c4ccc(Cl)cc4
  • InChI=1S/C23H18ClF2N3O3S/c1-2-9-33(31,32)29-19-8-7-18(25)20(21(19)26)22(30)17-12-28-23-16(17)10-14(11-27-23)13-3-5-15(24)6-4-13/h3-8,10-12,29H,2,9H2,1H3,(H,27,28) checkY
  • Key:GPXBXXGIAQBQNI-UHFFFAOYSA-N checkY
  (verify)
vemurafenib
Drug mechanism
Crystallographic structure of B-Raf (rainbow colored, N-terminus = blue, C-terminus = red) complexed with vemurafenib (spheres, carbon = white, oxygen = red, nitrogen = blue, chlorine = green, fluorine = cyan, sulfur = yellow).[2]
Therapeutic usemelanoma
Biological targetBRAF
Mechanism of actionprotein kinase inhibitor
External links
PDB ligand id032: PDBe, RCSB PDB
LIGPLOT3og7

Vemurafenib (

INN), sold under the brand name Zelboraf, is a medication used for the treatment of late-stage melanoma.[2] It is an inhibitor of the B-Raf enzyme and was developed by Plexxikon.[2]

Mechanism of action

Vemurafenib causes programmed cell death in melanoma cell lines.[3] Vemurafenib interrupts the B-Raf/MEK step on the B-Raf/MEK/ERK pathway − if the B-Raf has the common V600E mutation.

Vemurafenib only works in melanoma patients whose cancer has a V600E BRAF mutation (that is, at amino acid position number 600 on the B-Raf protein, the normal valine is replaced by glutamic acid).[4] About 60% of melanomas have this mutation. It also has efficacy against the rarer BRAF V600K mutation. Melanoma cells without these mutations are not inhibited by vemurafenib; the drug paradoxically stimulates normal BRAF and may promote tumor growth in such cases.[5][6]

Resistance

Three mechanisms of resistance to vemurafenib (covering 40% of cases) have been discovered:

Side effects

At the maximum tolerated dose (MTD) of 960 mg twice a day 31% of patients get skin lesions that may need surgical removal.[2] The BRIM-2 trial investigated 132 patients; the most common adverse events were arthralgia in 58% of patients, skin rash in 52%, and photosensitivity in 52%. In order to better manage side effects some form of dose modification was necessary in 45% of patients. The median daily dose was 1750 mg, 91% of the MTD.[10]

History

In a phase I clinical study, vemurafenib (then known as PLX4032) was able to reduce numbers of cancer cells in over half of a group of 16 patients with advanced melanoma. The treated group had a median increased survival time of 6 months over the control group.[11][12][13][14]

A second phase I study, in patients with a V600E mutation in B-Raf, ~80% showed partial to complete regression. The regression lasted from 2 to 18 months.[15]

In early 2010 a Phase I trial[16] for solid tumors (including colorectal cancer), and a phase II study (for metastatic melanoma) were ongoing.[17]

A phase III trial (vs dacarbazine) in patients with previously untreated metastatic melanoma showed an improved rates of overall and progression-free survival.[18]

In June 2011, positive results were reported from the phase III BRIM3 BRAF-mutation melanoma study.[19] The BRIM3 trial reported good updated results in 2012.[20]

Further trials are planned including a trial of vemurafenib co-administered with GDC-0973 (cobimetinib), a MEK-inhibitor.[19] After good results in 2014, the combination was submitted to the European Medical Agency and the US Food and Drug Administration for marketing approval.[21]

In January 2015, trial results compared vemurafenib with the combination of dabrafenib and trametinib for metastatic melanoma.[22]

Society and culture

Legal status

Vemurafenib was approved in the United States for the treatment of late-stage melanoma in August 2011,[23] making it the first drug designed using fragment-based lead discovery to gain regulatory approval.[24]

Vemurafenib was approved for use in Canada in February 2012.[25]

In February 2012, the

metastatic melanoma, the most aggressive form of skin cancer.[26]

In November 2017, the US Food and Drug Administration (FDA) approved vemurafenib for the treatment of people with Erdheim–Chester disease (ECD), a rare type of histiocytic neoplasm.[27][28]

Research

A trial combining vemurafenib and ipilimumab was stopped in April 2013 because of signs of liver toxicity.[29]

Treating Hairy Cell Leukemia

In 2012, a grant from the Hairy cell leukemia Foundation supported the discovery of the BRAF mutation in classic HCL. This discovery charted a new path forward for many patients. It improved diagnosis and opened the door for additional therapies to be used in managing HCL.[30] In a phase II clinical trial, Memorial Sloan Kettering is testing Vemurafenib, plus Obinutuzumab, in patients with previously untreated classical hairy cell leukemia.[31] A separate clinical study treatment with only Vemurafenib (or monotherarpy) demonstrated high response rates in relapsed/refractory (R/R) hairy cell leukemia (HCL), achieving an overall response rate of 86%, including 33% complete response (CR) and 53% partial response. However, after a median follow-up of 40 months, 21 of 31 responders (68%) experienced relapse with a median relapse-free survival (RFS) of 19 months (range, 12.5-53.9 months).[32]

References

  1. ^ a b "Australian Product Information: Zelboraf® (vemurafenib)". Roche Products Pty Limited. 25 March 2020.
  2. ^
    PMID 20823850
    .
  3. S2CID 16031942
    .
  4. PMID 25520039
    .
  5. PMID 20130576
    .
  6. PMID 20149136
    .
  7. PMID 21107323
    .
  8. PMID 22763439
    .
  9. PMID 22763448
    .
  10. ^ "BRIM-2 Upholds Benefits Emerging with Vemurafenib in Melanoma". Oncology & Biotech News. 5 (7). July 2011.
  11. ^ "Drug hope for advanced melanoma". BBC News. 2009-06-02. Retrieved 2009-06-07.
  12. ^ Harmon A (2010-02-21). "A Roller Coaster Chase for a Cure". The New York Times.
  13. PMID 20019269
    .
  14. ^ Flaherty K. "Phase I study of PLX4032: Proof of concept for V600E BRAF mutation as a therapeutic target in human cancer". 2009 ASCO Annual Meeting Abstract, J Clin Oncol 27:15s, 2009 (suppl; abstr 9000). Archived from the original on 2013-01-27. Retrieved 2010-09-10.
  15. PMID 20818844
    .
  16. ^ Clinical trial number NCT00405587 for "Safety Study of PLX4032 in Patients With Solid Tumors" at ClinicalTrials.gov
  17. ^ Clinical trial number NCT00949702 for "A Study of RO5185426 in Previously Treated Patients With Metastatic Melanoma" at ClinicalTrials.gov
  18. ^ "Plexxikon Announces First Patient Dosed in Phase 3 Trial of PLX4032 (RG7204) for Metastatic Melanoma" (Press release). Plexxikon. 2010-01-08. Archived from the original on 2020-12-01. Retrieved 2011-02-03.
  19. ^ a b "Plexxikon and Roche Report Positive Data from Phase III BRAF Mutation Melanoma Study". Genetic Engineering & Biotechnology News. Mary Ann Liebert Publishers. 6 June 2011.
  20. ^ "Vemurafenib Improves Overall Survival in Patients with Metastatic Melanoma". Archived from the original on 2022-01-11. Retrieved 2012-12-17.
  21. ^ "Cobimetinib at exelixis.com". Archived from the original on 2015-02-04. Retrieved 2015-02-04.
  22. ^ "MEK/BRAF Inhibitor Combo Reduces Death by One-Third in Melanoma". 2015.
  23. ^ "FDA Approves Zelboraf (Vemurafenib) and Companion Diagnostic for BRAF Mutation-Positive Metastatic Melanoma, a Deadly Form of Skin Cancer" (Press release). Genentech. Retrieved 2011-08-17.
  24. S2CID 9337155
    .
  25. ^ "Notice of Decision for ZELBORAF". Health Canada. 11 March 2012. Archived from the original on 2 May 2012. Retrieved 21 April 2012.
  26. ^ Hofland P (February 20, 2012). "First Personalized Cancer Medicine Allows Patients with Deadly Form of Metastatic Melanoma to Live Significantly Longer". Onco'Zine. The International Cancer Network. Archived from the original on April 11, 2012. Retrieved February 18, 2013.
  27. ^ "FDA approves first treatment for certain patients with Erdheim–Chester disease, a rare blood cancer". U.S. Food and Drug Administration (FDA) (Press release). Retrieved 2018-05-20.
  28. PMID 29188284
    .
  29. ISSN 0013-0613
    . Retrieved 2016-04-15.
  30. ^ "Hairy Cell Leukemia: Celebrating Progress?". HCLF Blog. July 29, 2022. Retrieved July 25, 2022.
  31. ^ Clinical trial number NCT03410875 for "Hairy Cell Leukemia with Vemurafebib" at ClinicalTrials.gov
  32. PMID 35930750
    .

Further reading
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