Reference Detail

Ref Type

Journal Article

PMID

(30002191)

Authors

Childress MA, Himmelberg SM, Chen H, Deng W, Davies MA, Lovly CM

Title

ALK Fusion Partners Impact Response to ALK Inhibition: Differential Effects on Sensitivity, Cellular Phenotypes, and Biochemical Properties.

Journal	Vol	Issue	Date	Pages	Journal Short Title
Molecular cancer research : MCR	16	11	2018 Nov	1724-1736	Mol Cancer Res

URL

Abstract Text

Oncogenic tyrosine kinase fusions involving the anaplastic lymphoma kinase (ALK) are detected in numerous tumor types. Although more than 30 distinct 5' fusion partner genes have been reported, treatment of ALK-rearranged cancers is decided without regard to which 5' partner is present. There is little data addressing how the 5' partner affects the biology of the fusion or responsiveness to ALK tyrosine kinase inhibitors (TKI). On the basis of the hypothesis that the 5' partner influences the intrinsic properties of the fusion protein, cellular functions that impact oncogenic potential, and sensitivity to ALK TKIs, clonal 3T3 cell lines stably expressing seven different ALK fusion variants were generated. Biochemical and cellular assays were used to assess the efficacy of various ALK TKIs in clinical use, transformative phenotypes, and biochemical properties of each fusion. All seven ALK fusions induced focus formation and colonies in soft agar, albeit to varying degrees. IC50s were calculated for different ALK TKIs (crizotinib, ensartinib, alectinib, lorlatinib) and consistent differences (5-10 fold) in drug sensitivity were noted across the seven ALK fusions tested. Finally, biochemical analyses revealed negative correlations between kinase activity and protein stability. These results demonstrate that the 5' fusion partner plays an important biological role that affects sensitivity to ALK TKIs.Implications: This study shows that the 5' ALK fusion partner influences ALK TKI drug sensitivity. As many other kinase fusions are found in numerous cancers, often with overlapping fusion partners, these studies have ramifications for other kinase-driven malignancies. Mol Cancer Res; 16(11); 1724-36. ©2018 AACR.

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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

Molecular Profile	Indication/Tumor Type	Response Type	Therapy Name	Approval Status	Evidence Type	Efficacy Evidence	References
EML4 - ALK	Advanced Solid Tumor	sensitive	Crizotinib	Preclinical - Cell culture	Actionable	In a preclinical study, Xalkori (crizotinib) inhibited growth of transformed cells expressing EML4-ALK in culture (PMID: 30002191).	30002191
EML4 - ALK	Advanced Solid Tumor	sensitive	Ensartinib	Preclinical - Cell culture	Actionable	In a preclinical study, Ensartinib (X-396) inhibited growth of transformed cells expressing EML4-ALK in culture (PMID: 30002191).	30002191