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  • Title: Screening for NTRK-rearranged Tumors Using Immunohistochemistry: Comparison of 2 Different pan-TRK Clones in Melanoma Samples.
    Author: Bourhis A, Redoulez G, Quintin-Roué I, Marcorelles P, Uguen A.
    Journal: Appl Immunohistochem Mol Morphol; 2020 Mar; 28(3):194-196. PubMed ID: 30920961.
    Abstract:
    NTRK-rearranged tumors could be treated using promising anti-TRK-targeted therapies in patients with advanced cancers including melanomas. Different targeted therapies are being developed together with different screening strategies including pan-TRK immunohistochemistry (IHC) as first-line screening strategies. In this technical study, we compared 2 pan-TRK IHC (using A7H6R and EPR17341 clones) in tumor samples of patients with advanced melanomas. IHC-positive cases were studied using NTRK1, NTRK2, and NTRK3 fluorescent in situ hybridization tests. Among 300 melanoma samples, 4 samples were positive using A7H6R IHC, but none using EPR17341. None of the 4 samples were NTRK-rearranged using fluorescent in situ hybridization. Different staining was also noted in nontumor kidney tissue, whereas an NTRK1-rearranged tumor used as positive control was strongly stained with both A7H6R and EPR17341 clones. Future studies including more numerous NTRK-rearranged tumors are required to further study and compare the performances of different pan-TRK clones in the screening of NTRK-rearranged cancers.
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