Molecular characterization of cancers with NTRK gene fusions

Modern Pathology : an Official Journal of the United States and Canadian Academy of Pathology, Inc
Zoran GatalicaSemir Vranic

Abstract

Targeted inhibitors of neurotropic tyrosine kinases are highly effective in selected patients with gene fusions involving NTRK1, NTRK2, or NTRK3. These fusions are consistently detected in rare cancer types (e.g., secretory breast carcinoma and congenital infantile fibrosarcoma), but the occurrence of NTRK fusions in common cancers and their relationship to other therapy biomarkers are largely unexplored. Tissue samples from 11,502 patients were analyzed for 53 gene fusions and sequencing of 592 genes, along with an immunohistochemical evaluation of TrkA/B/C and PD-L1. Thirty-one cases (0.27% of the entire cohort) had NTRK fusions. The most common fusions were ETV6:NTRK3 (n = 10) and TPM3:NTRK1 (n = 6). Gliomas had the highest number of NTRK fusions (14/982, 1.4%), most commonly involving NTRK2 (n = 9). Seventeen non-glioma cases with NTRK fusions included carcinomas of the lungs, thyroid, breast, cervix, colon, nasal cavity, cancer of unknown primary and soft tissue sarcomas. Strong and uniform Trk expression detected with a pan-Trk immunohistochemistry characterized 7/8 NTRK1 fusion cases and 8/9 NTRK2 fusion cases, while NTRK3 fused cases were positive in 6/11 (55%) of cases. 29% of NTRK fusion cases had no other pathogenic ...Continue Reading

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