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PMID (33209633)
Authors Latif H, Liu SV
Title Novel ALK mutation with durable response to brigatinib-a case report.
Journal Translational lung cancer research
Vol 9
Issue 5
Date 2020 Oct
URL
Abstract Text Anaplastic lymphoma kinase (ALK) tyrosine kinase inhibitors are the preferred initial treatment for ALK rearranged non-small cell lung cancer (NSCLC). While initial responses to next-generation inhibitors are robust, acquired resistance is expected for nearly all patients. Resistance is often mediated by point mutations along the solvent front. Use of the acquired mutational profile to guide therapy is still investigational and largely based on preclinical data demonstrating sensitivity of resistant cell lines to available kinase inhibitors. Here, we describe outcomes after development of an ALK L1196Q mutation. We present a patient with stage IV ALK rearranged lung cancer received who received first line crizotinib at 250 mg twice daily, then at progression, second line alectinib at 600 mg twice daily. When radiographic evidence of progression was noted, a biopsy was performed. Next generation sequencing (NGS) identified an acquired ALK L1196Q mutation. The patient was treated with third line brigatinib, at 90 mg daily and escalating to 180 mg daily, and achieved a partial response that is still ongoing, one year later. We highlight false-negative ALK mutation results when only plasma is used, particularly in early metastatic disease. We also discuss how the use of specific ALK resistance mutations to guide therapy is clinically relevant is being investigated.

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Molecular Profile Treatment Approach
Gene Name Source Synonyms Protein Domains Gene Description Gene Role
Therapy Name Drugs Efficacy Evidence Clinical Trials
Drug Name Trade Name Synonyms Drug Classes Drug Description
Gene Variant Impact Protein Effect Variant Description Associated with drug Resistance
ALK L1196Q missense unknown ALK L1196Q lies within the protein kinase domain of the Alk protein (UniProt.org). L1196Q has not been biochemically characterized, but has been demonstrated to confer resistance to Alk inhibitors in the context of ALK rearrangements (PMID: 23239810, PMID: 25749034, PMID: 33209633). Y
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
EML4 - ALK ALK L1196Q lung non-small cell carcinoma predicted - sensitive Brigatinib Case Reports/Case Series Actionable In a clinical case study, Alunbrig (brigatinib) treatment resulted in a partial response in a patient with metastatic lung adenocarcinoma harboring EML4-ALK and an acquired ALK L1196Q who progressed on prior Alecensa (alectinib) treatment, the response was ongoing after 17 months of treatment (PMID: 33209633). 33209633
EML4 - ALK ALK L1196Q lung non-small cell carcinoma predicted - resistant Alectinib Case Reports/Case Series Actionable In a clinical case study, a patient with metastatic lung adenocarcinoma harboring EML4-ALK demonstrated disease progression following a 15-month partial response to Alecensa (alectinib) treatment, and was found to have acquired ALK L1196Q (PMID: 33209633). 33209633