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GENTAUR Europe

 GENTAUR Europe BVBA
Voortstraat 49, 1910 Kampenhout BELGIUM
Tel 0032 16 58 90 45 
Fax 0032 16 50 90 45
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Gentaur Bulgaria

 GENTAUR BULGARIA
53 Iskar Str. 1191 Kokalyane, Sofia
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    GENTAUR France

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    9, rue Lagrange, 75005 Paris 
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     GENTAUR Ltd. 
    Howard Frank Turnberry House 
    1404-1410 High Road 
    Whetstone London N20 9BH 
    Tel 020 3393 8531 
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    ul. Grunwaldzka 88/A m.2

    81-771 Sopot, Poland
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    Piazza Giacomo Matteotti, 6, 24122 Bergamo
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    547, Yurok Circle
    San Jose, CA 95123
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    Displaying items by tag: ALKpositive

    The findings of a recent study indicate that routine testing with both fluorescent in situ hybridization (FISH) and immunohistochemistry (IHC) may enhance the detection of ALK-positive non-small cell lung cancer (NSCLC). Accurate determination of ALK-positive tumors is necessary to identify patients with advanced NSCLC who are most likely to benefit from targeted therapy with an ALK inhibitor.

    The discovery of ALK rearrangement in about 1% to 7% of NSCLCs led to the development of ALK inhibitors, such as crizotinib, which have significantly improved treatment response among people with ALK-positive NSCLC. FISH with break-apart probes is currently the only approved test for the detection of ALK positivity in NSCLC, but this technique may not be available or feasible in all institutions. IHC, which is more affordable and accessible than FISH, has been found to be reliable as a screening tool, but interpretation of its results have not been standardized. Researchers continue to explore the optimal testing process for identifying ALK-positive NSCLCs.

    Parallel testing with both FISH and IHC on 3,234 NSCLCs led to the identification of 150 tumors that were ALK positive by either test. The results of FISH and IHC were discordant in 80 of these tumors. As such, the use of FISH or IHC alone would have missed approximately 25% of ALK-positive cases. The findings of the study are published in the March issue of the International Association for the Study of Lung Cancer's journal, the Journal of Thoracic Oncology (JTO).

    Most discordant results were FISH-positive/IHC-negative (36 cases); FISH-negative/IHC-positive results were found in 19 cases, and FISH-noncontributive/IHC-positive results were found in 15 cases. Preliminary data from 44 evaluable patients showed that treatment with an ALK inhibitor was associated with a high response rate, with response noted among patients who had tumors with discordant results (either FISH-positive/IHC-negative or FISH-negative/IHC-positive).

    "Data on crizotinib response in patients who have been diagnosed differently by FISH and IHC are still preliminary. Thus, until large-scale studies in patients under therapy with crizotinib determine which testing is the most relevant to predict responses to ALK inhibition, our data support the need to routinely perform both analyses because of the difficulty in detecting the chimeric ALK protein in NSCLC and the presence of false-negative cases for each method," says lead author Florian Cabillic, PharMD, PhD, Université de Rennes, Rennes, France.

    The study also demonstrated that systematic testing of NSCLC by both FISH and IHC is feasible in routine practice. In addition, the findings indicate that performing FISH routinely on all NSCLC specimens may require an automated process at various stages of the analysis.

    Published in News