Alectinib

Alectinib (INN,[2] marketed as Alecensa) is an oral drug that blocks the activity of anaplastic lymphoma kinase (ALK)[3][4] and is used to treat non-small-cell lung cancer (NSCLC). It was developed by Chugai Pharmaceutical Co. Japan, which is part of the Hoffmann-La Roche group.

Alectinib
Clinical data
Pronunciation/əˈlɛktɪnɪb/ ə-LEK-ti-nib
Trade namesAlecensa
AHFS/Drugs.comMonograph
MedlinePlusa616007
License data
Routes of
administration		By mouth (capsules)
ATC code
Legal status
Legal status
Pharmacokinetic data
Bioavailability37% (under fed conditions)
Protein binding>99%
MetabolismMainly CYP3A4
MetabolitesM4 (active)
Elimination half-life33 hours (alectinib), 31 hours (M4)
ExcretionFeces (98%)[1]
Identifiers
CAS Number
PubChem CID
DrugBank
ChemSpider
UNII
KEGG
ChEBI
CompTox Dashboard (EPA)
ECHA InfoCard100.256.083
Chemical and physical data
FormulaC30H34N4O2
Molar mass482.628 g·mol−1
3D model (JSmol)

History, clinical trials, Approvals and medical uses

Alectinib was approved in Japan in July 2014[5] for the treatment of ALK fusion-gene positive, unresectable, advanced or recurrent non-small-cell lung cancer (NSCLC).[4]

It was granted an accelerated approval by the US Food and Drug Administration (FDA) in December 2015 to treat patients with advanced ALK-positive NSCLC whose disease worsened after, or who could not tolerate, treatment with crizotinib (Xalkori).[3] (This was converted into a full approval in Nov 2017).[6]

It got a conditional approval by the European Medicines Agency in February 2017 for the same indication. This means that additional studies are awaited to confirm a positive benefit-risk-ratio.[7]

The approvals were based mainly on two trials: In a Japanese Phase I–II trial, after approximately 2 years, 19.6% of patients had achieved a complete response, and the 2-year progression-free survival rate was 76%.[4] In February 2016 the J-ALEX phase III study comparing alectinib with crizotinib was terminated early because an interim analysis showed that progression-free survival was longer with alectinib.[8]

In November 2017 the FDA approved alectinib for the first-line treatment of patients with ALK-positive metastatic non-small cell lung cancer.[6] This based on the phase 3 ALEX trial comparing it with crizotinib.[6]

Contraindications

There are no contraindications under the US approval.[9] The European approval only has the default remark about hypersensitivity being a contraindication.[10]

Side effects

Apart from unspecific gastrointestinal effects such as constipation (in 34% of patients) and nausea (22%), common adverse effects in studies included oedema (swelling; 34%), myalgia (muscle pain; 31%), anaemia (low red blood cell count), sight disorders, light sensitivity and rashes (all below 20%).[11] Serious side effects occurred in 19% of patients; fatal ones in 2.8%.[9]

Interactions

Alectinib has a low potential for interactions. While it is metabolised by the liver enzyme CYP3A4, and blockers of this enzyme accordingly increase its concentrations in the body, they also decrease concentrations of the active metabolite M4, resulting in only a small overall effect. Conversely, CYP3A4 inducers decrease alectinib concentrations and increase M4 concentrations. Interactions via other CYP enzymes and transporter proteins cannot be excluded but are unlikely to be of clinical significance.[11][10]

Pharmacology

Mechanism of action

The substance potently and selectively blocks two receptor tyrosine kinase enzymes: anaplastic lymphoma kinase (ALK) and the RET proto-oncogene. The active metabolite M4 has similar activity against ALK. Inhibition of ALK subsequently blocks cell signalling pathways, including STAT3 and the PI3K/AKT/mTOR pathway, and induces death (apoptosis) of tumour cells.[11][10]

Pharmacokinetics
Proposed metabolism of alectinib. Alectinib itself and the active metabolite M4 are the main compounds found in the circulation, while the others are minor metabolites.[12]

When taken with a meal, the absolute bioavailability of the drug is 37%, and highest blood plasma concentrations are reached after four to six hours. Steady state conditions are reached within seven days. Plasma protein binding of alectinib and M4 is over 99%. The enzyme mainly responsible for alectinib metabolism is CYP3A4; other CYP enzymes and aldehyde dehydrogenases only play a small role. Alectinib and M4 account for 76% of the circulating substance, while the rest are minor metabolites.[11][12]

Plasma half-life of alectinib is 32.5 hours, and that of M4 is 30.7 hours. 98% are excreted via the faeces, of which 84% are unchanged alectinib and 6% are M4. Less than 1% are found in the urine.[11][12]

Chemistry

Alectinib has a pKa of 7.05. It is used in form of the hydrochloride, which is a white to yellow-white lumpy powder.[9]

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References
  1. "Alecensa (alectinib) Capsules, for Oral Use. Full Prescribing Information" (PDF). Genentech USA, Inc. Retrieved 8 February 2017.
  2. "International Nonproprietary Names for Pharmaceutical Substances (INN). Recommended International Nonproprietary Names: List 70" (PDF). World Health Organization. p. 279. Retrieved 8 February 2017.
  3. New Oral Therapy To Treat ALK-Positive Lung Cancer. Dec 2015
  4. McKeage K (January 2015). "Alectinib: a review of its use in advanced ALK-rearranged non-small cell lung cancer". Drugs. 75 (1): 75–82. doi:10.1007/s40265-014-0329-y. PMID 25428710.
  5. Japan becomes first country to approve Roche's alectinib for people with a specific form of advanced lung cancer
  6. FDA approves Alecensa for ALK-positive metastatic non-small cell lung cancer Nov 2017
  7. "Alecensa authorisation details". European Medicines Agency. 16 February 2017.
  8. Chugai's ALK Inhibitor "Alecensa" Trial Stopped Early for Benefit. Feb 2016
  9. FDA Professional Drug Information on Alecensa.
  10. "Alecensa: EPAR – Product Information" (PDF). European Medicines Agency. 16 May 2017.
  11. Haberfeld, H, ed. (2017). Austria-Codex (in German). Vienna: Österreichischer Apothekerverlag. Alecensa 150 mg Hartkapseln.
  12. "Alecensa: Assessment report" (PDF). European Medicines Agency. 15 December 2016.
  • "Alectinib". Drug Information Portal. U.S. National Library of Medicine.
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