Alunbrig (Brigatinib) Approved for Metastatic NSCLC with ALK Mutation
Lung cancer is one of the most common cancers in men and women, and is the leading cause of cancer-related mortality in the United States.1 According to the American Cancer Society, more than 155,000 Americans will die from lung cancer in 2017, representing approximately 25% of all cancer deaths.1 Non–small-cell lung cancer (NSCLC), the most common form of the disease, accounts for 80% to 85% of all lung cancer cases.2
As knowledge of lung cancer tumor cell biology has evolved, small-molecule drugs that target specific genetic mutations offer oncologists the opportunity to treat patients with NSCLC in a personalized fashion.3 Multiple driver oncogenes have been identified in lung cancer, including epidermal growth factor receptor (EGFR), anaplastic lymphoma kinase (ALK), and KRAS.
Among US patients with advanced NSCLC, approximately 10% have EGFR mutations,3 approximately 23% have KRAS mutations,4 and up to 13% have ALK mutations.5 By identifying these mutations, oncologists can determine which patients can benefit from available targeted therapies.
Crizotinib (Xalkori) was the first tyrosine kinase inhibitor (TKI) and alectinib (Alecensa) was the second TKI approved by the US Food and Drug Administration (FDA) for patients with advanced ALK-positive NSCLC.6,7 Although many patients with ALK-rearranged NSCLC respond to a TKI, the resistance rate is high within 1 to 2 years.8 Unlike crizotinib, which does not cross into the brain to target tumors in the central nervous system (CNS),9 alectinib has been shown to have “an effect on tumors that have spread to the brain.”7 Still, additional treatment options for ALK inhibition are needed that can cross the blood–brain barrier.
Brigatinib Approved for ALK-Positive NSCLC
On April 28, 2017, the FDA accelerated the approval of brigatinib (Alunbrig; Takeda Oncology), a new-generation oral ALK inhibitor, for the treatment of patients with ALK-positive metastatic NSCLC who do not tolerate or have had an inadequate response to crizotinib.10,11
The FDA’s approval of brigatinib was based on overall response rate (ORR) data from the noncomparative clinical trial called ALTA.10,12
Commenting on the study results, David Ross Camidge, MD, PhD, Director of Thoracic Oncology, School of Medicine, University of Colorado Denver, noted that brigatinib “was highly effective post-crizotinib….Importantly, the extent of activity among those with brain metastases was also notable.”11
Continued approval of brigatinib is contingent on results of a confirmatory trial. Brigatinib was also granted a breakthrough therapy and an orphan drug designation.10
Mechanism of Action
Brigatinib is a TKI active against multiple kinases, including ALK, ROS1, FLT3, and insulinlike growth factor-1 receptor, as well as EGFR deletion and point mutations. At clinically achievable concentrations in vitro, brigatinib alters the viability of cells that are resistant to ALK inhibitors.13
Dosing and Administration
The recommended dose of brigatinib is 90 mg once daily, taken orally, for 7 days. If the drug is tolerated, the dose is then increased to 180 mg once daily orally, and used until disease progression or unacceptable toxicity. Brigatinib can be taken with or without food.13
Pivotal Clinical Trial: ALTA
The efficacy of brigatinib was evaluated in ALTA, a 2-arm, open-label, multicenter clinical trial of 222 adults with locally advanced or metastatic ALK-positive NSCLC whose disease progressed while using crizotinib.12,13 Patients with CNS metastases who were neurologically stable were eligible for this trial; patients who had received crizotinib within 3 days of the first dose of brigatinib were excluded. The primary efficacy measure was ORR based on Response Evaluation Criteria in Solid Tumors (RECIST) v1.1, and was evaluated by an Independent Review Committee.12
The patients were randomized to brigatinib 90 mg once daily (N = 112) or to 180 mg once daily after receiving 90 mg once daily for 7 days (N = 110). Patients were stratified based on the presence of brain metastases and best response to crizotinib therapy.12,13 The median duration of exposure to brigatinib was approximately 7.5 months. The median duration of follow-up was 8 months (range, 0.1-20.2 months).12
The Table summarizes the response rate and duration of response to brigatinib.13 Among the patients with brain metastases at baseline, 67% of those receiving the 180-mg once-daily dose had intracranial (partial) responses lasting a median of 5.6 months.12,13
The safety and tolerability of brigatinib were assessed in 219 patients in the ALTA study.
The most common adverse events occurring in ≥25% of patients receiving brigatinib were nausea, diarrhea, fatigue, cough, and headache. Serious adverse events occurred in 38% of patients receiving brigatinib 90 mg; of these, the most common were pneumonia and interstitial lung disease or pneumonitis.12,13
Overall, 8.2% of patients who received the 180-mg dose discontinued brigatinib because of adverse reactions, and 20% required drug delays or treatment interruptions because of adverse events. The most common adverse event leading to dose reduction was high creatinine phosphokinase.12,13
Brigatinib has been associated with 8 deaths in the ALTA study, including 2 patients from pneumonia, and 1 patient, each, from bacterial meningitis, dyspnea, respiratory failure, pulmonary embolism, sudden death, and urosepsis.12,13
Brigatinib has no contraindications.13
Use in Specific Populations
Women of child-bearing potential should use effective contraception during treatment with brigatinib, and for ≥4 months after the last dose. Men whose female partners are of reproductive potential should use effective contraception during treatment, and for ≥3 months after the last dose of brigatinib.13
Warnings and Precautions
Brigatinib has been associated with severe and fatal pulmonary events consistent with interstitial lung disease and pneumonitis.13
Hypertension and bradycardia have also been reported with brigatinib. Blood pressure and heart rate should be monitored during therapy.13
Visual disturbances can occur with brigatinib.13
Because of the risk for creatinine phosphokinase elevation, patients should be monitored while taking brigatinib.13
Elevated lipase and amylase levels, as well as new or worsening hyperglycemia, can occur; monitor patients for these reactions.13
The FDA accelerated approval of brigatinib provides a new oral TKI and a new ALK inhibitor option for patients with ALK-positive NSCLC. Furthermore, brigatinib has shown activity in patients with ALK-positive NSCLC and brain metastases. The ongoing phase 3 clinical trial ALTA-1L is comparing brigatinib and crizotinib for initial therapy in patients with ALK-positive NSCLC.14
- American Cancer Society. Key statistics for lung cancer. Revised January 5, 2017. www.cancer.org/cancer/lungcancer-non-smallcell/detailedguide/non-small-cell-lung-cancer-key-statistics. Accessed August 9, 2017.
- American Cancer Society. What is non-small cell lung cancer? Revised May 16, 2016. www.cancer.org/cancer/lungcancer-non-smallcell/detailedguide/non-small-cell-lung-cancer-what-is-non-small-cell-lung-cancer. Accessed August 9, 2017.
- Hirsh V, Melosky B, Goss G, et al. A personalized approach to treatment: use of EGFR tyrosine kinase inhibitors for the treatment of non-small-cell lung cancer in Canada. Curr Oncol. 2012;19:78-90. Erratum in: Curr Oncol. 2012;19:e228.
- Massarelli E, Varella-Garcia M, Tang X, et al. KRAS mutation is an important predictor of resistance to therapy with epidermal growth factor receptor tyrosine kinase inhibitors in non-small-cell lung cancer. Clin Cancer Res. 2007;13:2890-2896.
- Shaw AT, Yeap BY, Mino-Kenudson M, et al. Clinical features and outcome of patients with non-small-cell lung cancer who harbor EML4-ALK. J Clin Oncol. 2009;27:4247-4253.
- Drugs.com. FDA approves Xalkori with companion diagnostic for a type of late-stage lung cancer. August 11, 2011. www.drugs.com/newdrugs/fda-approves-xalkori-companion-diagnostic-type-late-stage-lung-cancer-2828.html. Accessed September 6, 2017.
- US Food and Drug Administration. FDA approves new oral therapy to treat ALK-positive lung cancer. December 11, 2015. www.fda.gov/newsevents/newsroom/pressannouncements/ucm476926.htm. Accessed September 6, 2017.
- Friboulet L, Li N, Katayama R, et al. The ALK inhibitor ceritinib overcomes crizotinib resistance in non-small cell lung cancer. Cancer Discov. 2014;4:662-673.
- Shaw AT, Yeap BY, Solomon BJ, et al. Effect of crizotinib on overall survival in patients with advanced non-small-cell lung cancer harbouring ALK gene rearrangement: a retrospective analysis. Lancet Oncol. 2011;12:1004-1012.
- US Food and Drug Administration. Brigatinib. www.fda.gov/drugs/informationondrugs/approveddrugs/ucm555841.htm. Accessed August 9, 2017.
- Takeda Pharmaceutical. Takeda announces FDA accelerated approval of Alunbrig (brigatinib). Press release. www.takeda.com/newsroom/newsreleases/2017/alunbrig-fda-approval/. Accessed September 6, 2017.
- Kim DW, Tiseo M, Ahn M, et al. Brigatinib in patients with crizotinib-refractory anaplastic lymphoma kinase-positive non-small-cell lung cancer: a randomized, multicenter phase II trial. J Clin Oncol. 2017;35:2490-2498.
- Alunbrig (brigatinib) tablets [prescribing information]. Cambridge, MA: Takeda Pharmaceutical; October 2017.
- ClinicalTrials.gov. ALTA-1L study: a phase 3 study of brigatinib versus crizotinib in ALK-positive advanced non-small cell lung cancer patients (ALTA-1L). https://clinicaltrials.gov/ct2/show/NCT02737501. Accessed August 11, 2017.