The most common side effects include constipation, muscle pain and edema (swelling) including of the ankles and feet, the face, the eyelids and the area around the eyes.[5]
Alectinib was approved for medical use in Japan in 2014, the United States in 2015, Canada in 2016, Australia in 2017, the European Union in 2017, and the United Kingdom in 2021.[4][5]
Medical uses
In the European Union, alectinib is indicated for the first-line treatment of adults with anaplastic lymphoma kinase (ALK)-positive advanced non-small cell lung cancer (NSCLC);[5] and for the treatment of adults with ALK‑positive advanced NSCLC previously treated with crizotinib.[5]
In the United States, it is indicated for the treatment of people with anaplastic lymphoma kinase (ALK)-positive metastatic non-small cell lung cancer (NSCLC) as detected by an FDA-approved test.[4]
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%).[10] Serious side effects occurred in 19% of patients; fatal ones in 2.8%.[4]
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.[10][9]
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.[11]
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.[10][11]
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.[10][11]
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.[4]
History
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%.[8] 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.[12]
In November 2017, the FDA approved alectinib for the first-line treatment of people with ALK-positive metastatic non-small cell lung cancer.[13] This based on the phase 3 ALEX trial comparing it with crizotinib.[13]
Society and culture
Legal status
Alectinib was approved in Japan in July 2014,[14] for the treatment of ALK fusion-gene positive, unresectable, advanced or recurrent non-small-cell lung cancer (NSCLC).[8]
Alectinib was granted an accelerated approval by the US Food and Drug Administration (FDA) in December 2015, to treat people with advanced ALK-positive NSCLC whose disease worsened after, or who could not tolerate, treatment with crizotinib (Xalkori).[7]
^ abcdef"Alecensa EPAR". European Medicines Agency (EMA). 29 March 2023. Retrieved 20 August 2023. Text was copied from this source which is copyright European Medicines Agency. Reproduction is authorized provided the source is acknowledged.
Clinical trial number NCT01588028 for "A Study of Alectinib (CH5424802/RO5424802) in Participants With Anaplastic Lymphoma Kinase (ALK)-Rearranged Non-Small Cell Lung Cancer (NSCLC)" at ClinicalTrials.gov
Clinical trial number NCT01801111 for "A Study of Alectinib (RO5424802) in Participants With Non-Small Cell Lung Cancer Who Have Anaplastic Lymphoma Kinase (ALK) Mutation and Failed Crizotinib Treatment" at ClinicalTrials.gov
Clinical trial number NCT02075840 for "A Study Comparing Alectinib With Crizotinib in Treatment-Naive Anaplastic Lymphoma Kinase-Positive Advanced Non-Small Cell Lung Cancer Participants (ALEX)" at ClinicalTrials.gov
Targeted cancer therapy / antineoplastic agents (L01)
