Chemistry:Osimertinib

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Short description: Chemical compound, used as a medication to treat lung cancer
Osimertinib
Osimertinib.svg
Clinical data
Trade namesTagrisso, others
Other namesAZD9291, mereletinib, osimertinib mesilate (JAN JP), osimertinib mesylate (USAN US)
AHFS/Drugs.comMonograph
MedlinePlusa616005
License data
Pregnancy
category
  • AU: D
Routes of
administration		By mouth tablets
ATC code
Legal status
Legal status
Pharmacokinetic data
Protein bindingProbably high[2]
MetabolismOxidation (CYP3A)
Elimination half-life48 hours
ExcretionFeces (68%), urine (14%)
Identifiers
CAS Number
PubChem CID
DrugBank
ChemSpider
UNII
KEGG
ChEBI
PDB ligand
Chemical and physical data
FormulaC28H33N7O2
Molar mass499.619 g·mol−1
3D model (JSmol)

Osimertinib, sold under the brand name Tagrisso,[4] is a medication used to treat non-small-cell lung carcinomas with specific mutations.[5][6] It is a third-generation epidermal growth factor receptor tyrosine kinase inhibitor.

The most common side effects include diarrhea, rash, musculoskeletal pain, dry skin, skin inflammation around nails, sore mouth, fatigue and cough.[7]

Osimertinib was approved for medical use in the United States in November 2015,[8] and in the European Union in February 2016.[3]

Medical uses

Osimertinib is used to treat locally advanced or metastatic non-small-cell lung cancer (NSCLC), if the cancer cells are positive for the T790M mutation in the gene coding for EGFR or for activating EGFR mutations.[2] [9]The T790M mutation may be de novo or acquired following first-line treatment with other EGFR tyrosine kinase inhibitors, such as gefitinib, erlotinib, and afatinib.[10]

In the US, EGFR exon 19 deletions, exon 21 L858R mutations or the T790M status of the patient prior to treatment with osimertinib must be detected by a companion diagnostic test.[2] The Food and Drug Administration (FDA) has approved multiple tests, including FoundationOne CDx for this purpose.[11] In Europe and elsewhere, activating EGFR mutations or T790M mutations may be determined by a validated test.[12]

In people treated with osimertinib, resistance usually develops within approximately 10 months.[13] Resistance mediated by an exon 20 C797S mutation accounts for the majority of resistance cases,[14] which has resulted in multiple attempts with non-ATP competitive or allosteric inhibitors to try and offset this acquired resistance by targeting other regions of the RTK kinase domain.[15]

It can cause fetal harm, so should not be used in women who are pregnant, and women who take it should avoid becoming pregnant.[2][16]

Caution should be taken in people with a history of interstitial lung disease (ILD), as they were excluded from clinical trials, since the drug can cause severe ILD or pneumonitis. Caution should also be taken in people with a predisposition to long QT syndrome as the drug can provoke this.[2]

Adverse effects

Very common (greater than 10% of clinical trial subjects) adverse effects include diarrhea, stomatitis, rashes, dry or itchy skin, infections where finger or toenails abut skin, low platelet counts, low leukocyte counts, and low neutrophil counts.[17]

Common (between 1% and 10% of clinical trial subjects) adverse effects include interstitial lung disease.[17]

Interactions

Osimertinib is metabolized by CYP3A4 and CYP3A5, so substances that strongly inhibit either enzyme, like macrolide antibiotics, antifungals, and antivirals may increase exposure to osimertinib, and substances like rifampicin that activate either enzyme may decrease the effectiveness of osimertinib.[2][17]

Pharmacology

Osimertinib preferentially binds irreversibly to mutated epidermal growth factor receptor proteins, particularly those with more common mutations in lung cancer such as L858R mutation or an exon 19 deletion.[2]

It exhibits linear pharmacokinetics; the median time to Cmax is 6 hours (range 3–24 hours). The estimated mean half-life is 48 hours, and oral clearance (CL/F) is 14.3 (L/h).[2] 68% of elimination is by feces and 14% by urine.[2]

Chemistry

Osimertinib is provided as the mesylate; the chemical formula is C28H33N7O2·CH4O3S, and the molecular weight is 596 g/mol. The chemical name is N-(2-{2-dimethylaminoethyl-methylamino}-4-methoxy-5-{[4-(1-methylindol-3-yl)pyrimidin-2-yl]amino}phenyl)prop-2-enamide mesylate salt.[2]

History

The drug discovery program that led to osimertinib started in 2009 and yielded the drug by 2012; the process was structure-driven and aimed to find a third generation EGFR inhibitor that would selectively target the T790M form of the EGFR receptor.[18]

Osimertinib was designated as a Breakthrough Therapy in April 2014, based on Phase I trial results,[18] and the drug was provisionally approved under the FDA accelerated approval program with a priority review voucher, in November 2015.[19][8]

In February 2016, the EMA provisionally approved osimertinib under an accelerated process—the first approval under the program.[18][3]

Society and culture

Economics

At launch, in the United States AstraZeneca priced the drug at $12,750 per month.[20]:59

Research

(As of 2020), several clinical trials are ongoing.[21]

References

  1. ↑ "Prescription medicines: registration of new chemical entities in Australia, 2016". 21 June 2022. https://www.tga.gov.au/prescription-medicines-registration-new-chemical-entities-australia-2016. 
  2. ↑ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 "Tagrisso- osimertinib tablet, film coated". 5 June 2020. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=5e81b4a7-b971-45e1-9c31-29cea8c87ce7. 
  3. ↑ 3.0 3.1 3.2 "Tagrisso EPAR". 17 September 2018. https://www.ema.europa.eu/en/medicines/human/EPAR/tagrisso. 
  4. ↑ "Proposed INN: List 113". International Nonproprietary Names for Pharmaceutical Substances (INN) 29 (2): 285. 2015. https://www.who.int/medicines/publications/druginformation/INN_List113.pdf. Retrieved 16 November 2015. 
  5. ↑ "Emerging Agents and New Mutations in EGFR-Mutant Lung Cancer". Clinical Cancer Research 21 (17): 3818–20. September 2015. doi:10.1158/1078-0432.CCR-15-1211. PMID 26169963. 
  6. ↑ "Treatment approaches for EGFR-inhibitor-resistant patients with non-small-cell lung cancer". The Lancet. Oncology 16 (9): e447–e459. September 2015. doi:10.1016/S1470-2045(15)00246-6. PMID 26370354. https://www.repository.cam.ac.uk/handle/1810/252502. 
  7. ↑ "FDA Approves First Adjuvant Therapy for Most Common Type of Lung Cancer". U.S. Food and Drug Administration (FDA) (Press release). 18 December 2020. Retrieved 20 December 2020.
  8. ↑ 8.0 8.1 "Tagrisso (osimertinib) tablets". 22 December 2015. https://www.accessdata.fda.gov/drugsatfda_docs/nda/2015/208065Orig1s000TOC.cfm. 
  9. ↑ "Overall survival in advanced epidermal growth factor receptor mutated non-small cell lung cancer using different tyrosine kinase inhibitors in The Netherlands: a retrospective, nationwide registry study". The Lancet Regional Health. Europe 27: 100592. April 2023. doi:10.1016/j.lanepe.2023.100592. PMID 36817181. 
  10. ↑ "The latest therapeutic strategies after resistance to first generation epidermal growth factor receptor tyrosine kinase inhibitors (EGFR TKIs) in patients with non-small cell lung cancer (NSCLC)". Annals of Translational Medicine 3 (7): 96. May 2015. doi:10.3978/j.issn.2305-5839.2015.03.60. PMID 26015938. 
  11. ↑ Center for Devices and Radiological Health. "In Vitro Diagnostics - List of Cleared or Approved Companion Diagnostic Devices (In Vitro and Imaging Tools)" (in en). https://www.fda.gov/MedicalDevices/ProductsandMedicalProcedures/InVitroDiagnostics/ucm301431.htm. 
  12. ↑ "European Tagrisso information". http://www.ema.europa.eu/docs/en_GB/document_library/EPAR_-_Product_Information/human/004124/WC500202022.pdf. 
  13. ↑ "Recent updates on third generation EGFR inhibitors and emergence of fourth generation EGFR inhibitors to combat C797S resistance". European Journal of Medicinal Chemistry 142: 32–47. December 2017. doi:10.1016/j.ejmech.2017.05.027. PMID 28526474. 
  14. ↑ "EAI045: The fourth-generation EGFR inhibitor overcoming T790M and C797S resistance". Cancer Letters 385: 51–54. January 2017. doi:10.1016/j.canlet.2016.11.008. PMID 27840244. 
  15. ↑ "Receptor tyrosine kinases and cancer: oncogenic mechanisms and therapeutic approaches". Oncogene 40 (24): 4079–4093. June 2021. doi:10.1038/s41388-021-01841-2. PMID 34079087. 
  16. ↑ "Osimertinib: A third-generation tyrosine kinase inhibitor for treatment of epidermal growth factor receptor-mutated non-small cell lung cancer with the acquired Thr790Met mutation". Journal of Oncology Pharmacy Practice 24 (5): 379–388. July 2018. doi:10.1177/1078155217712401. PMID 28565936. 
  17. ↑ 17.0 17.1 17.2 "UK label" (in en). UK Electronic Medicines Compendium. 26 January 2017. https://www.medicines.org.uk/emc/medicine/31496. 
  18. ↑ 18.0 18.1 18.2 "Osimertinib (AZD9291)-a science-driven, collaborative approach to rapid drug design and development". Annals of Oncology 27 (6): 1165–70. June 2016. doi:10.1093/annonc/mdw129. PMID 26961148. 
  19. ↑ "Approved Drugs - Osimertinib". U.S. Food and Drug Administration (FDA). November 13, 2015. https://www.fda.gov/Drugs/InformationOnDrugs/ApprovedDrugs/ucm472565.htm. 
  20. ↑ "AHRQ Healthcare Horizon Scanning System – Potential High-Impact Interventions Report Priority Area 02: Cancer". AHRQ. December 2015. https://effectivehealthcare.ahrq.gov/ehc/assets/File/Cancer-Horizon-Scan-High-Impact-1512.pdf. 
  21. ↑ "Search of: Osimertinib - List Results - ClinicalTrials.gov". https://clinicaltrials.gov/ct2/results?term=Osimertinib&Search=Apply&age_v=&gndr=&type=&rslt=. 

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