Reference Detail

Ref Type

Journal Article

PMID

(25393796)

Authors

Ou SH, Klempner SJ, Greenbowe JR, Azada M, Schrock AB, Ali SM, Ross JS, Stephens PJ, Miller VA

Title

Identification of a novel HIP1-ALK fusion variant in Non-Small-Cell Lung Cancer (NSCLC) and discovery of ALK I1171 (I1171N/S) mutations in two ALK-rearranged NSCLC patients with resistance to Alectinib.

Journal	Vol	Issue	Date	Pages	Journal Short Title
Journal of thoracic oncology : official publication of the International	9	12	2014 Dec	1821-5	J Thorac Oncol

URL

Abstract Text

Huntingtin-interacting protein 1 (HIP1) has recently been identified as a new fusion partner fused to anaplastic lymphoma kinase (ALK) in non-small-cell lung cancer (NSCLC). To date, two variants of HIP1-ALK (H21; A20) and (H28; A20) have been identified in NSCLC. However, the response of patients with NSCLC harboring HIP1-ALK to ALK inhibitors and potential resistance mechanisms to such remain unknown. Here, we report a patient with NSCLC harboring a novel HIP1-ALK fusion variant (H30; A20). This patient and another patient with EML4-ALK variant 3a/b initially responded sequentially to crizotinib and then alectinib, a next-generation ALK inhibitor, but developed acquired resistance to alectinib with the presence of a mutation in amino acid residue 1171 (I1171N and I1171S respectively) located in the hydrophobic regulatory spine (R-spine) of the ALK kinase in both the cases as identified by a comprehensive next-generation sequencing-based assay performed on biopsies of new liver metastases that developed during alectinib treatment.

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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	I1171S	missense	unknown	ALK I1171S lies within the protein kinase domain of the Alk protein (UniProt.org). I1171S has been demonstrated to confer drug resistance in the context of ALK fusions in culture (PMID: 27009859, PMID: 25393796, PMID: 26464158), but has not been biochemically characterized and therefore, its effect on Alk protein function is unknown (PubMed, Nov 2023).	Y

Molecular Profile	Indication/Tumor Type	Response Type	Therapy Name	Approval Status	Evidence Type	Efficacy Evidence	References
EML4 - ALK ALK I1171S	lung non-small cell carcinoma	predicted - resistant	Alectinib	Case Reports/Case Series	Actionable	In a clinical case study, a patient with EML4-ALK positive non-small cell lung cancer initially responded to Alecensa (alectinib), but progressed with the emergence of a secondary ALK I1171S mutation (PMID: 25393796).	25393796