Reference Detail

Ref Type

Journal Article

PMID

(27354483)

Authors

Yoshida T, Oya Y, Tanaka K, Shimizu J, Horio Y, Kuroda H, Sakao Y, Hida T, Yatabe Y

Title

Differential Crizotinib Response Duration Among ALK Fusion Variants in ALK-Positive Non-Small-Cell Lung Cancer.

Journal	Vol	Issue	Date	Pages	Journal Short Title
Journal of clinical oncology : official journal of the American Society of Clinical Oncology	34	28	2016 Oct 01	3383-9	J Clin Oncol

URL

Abstract Text

Anaplastic lymphoma kinase (ALK) rearrangement-positive non-small-cell lung cancers can be effectively treated with an ALK tyrosine kinase inhibitor (TKI) such as crizotinib, but the response magnitude and duration are heterogeneous. Several ALK variants have been identified, but few studies have focused on the effects of different ALK variants on the efficacy of crizotinib.Among 55 patients treated with crizotinib as the initial ALK-TKI between January 2007 and December 2014, we identified 35 patients with tumor specimens that could be evaluated for ALK variants by reverse transcription polymerase chain reaction. We retrospectively evaluated the efficacy of crizotinib on the basis of the objective response rate and progression-free survival (PFS) according to the ALK variants.The most frequent ALK variant was variant 1 in 19 patients (54%), followed by variant 2 in five patients (14%), variant 3a/3b in four patients (12%), and other variants in seven patients (20%). Objective response rate was 69% in all patients, whereas it was 74% and 63% in the variant 1 and non-variant 1 groups, respectively. The median PFS time was significantly longer in patients with variant 1 than in those with non-variant 1 (median PFS, 11.0 months [95% CI, 6.5 to 43.0 months] v 4.2 months [95% CI, 1.6 to 10.2 months], respectively; P < .05). Multivariable analysis identified two significant factors associated with PFS duration, ALK variant 1 (hazard ratio, 0.350; 95% CI, 0.128 to 0.929; P < .05) and advanced stage (hazard ratio, 4.646; 95% CI, 1.381 to 21.750; P < .05).Our results indicate the better efficacy of crizotinib in patients with ALK variant 1 versus non-variant 1. The ALK variant status might affect the efficacy of ALK-TKIs.

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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	lung non-small cell carcinoma	sensitive	Crizotinib	Clinical Study - Cohort	Actionable	In a clinical study, non-small cell lung carcinoma patients harboring an EML4-ALK variant 1 (E13; A20, n=19) demonstrated a significantly longer progression-free survival (11.0 vs 4.2 months, p<0.05) compared to patients with a non-variant 1 EML4-ALK fusion (n=16) when treated with Xalkori (crizotinib) (PMID: 27354483).	27354483